https://www.virt-host.com/wp-content/plugins/WHMpress_Client_Area_…?ver=0004aaf805613db047db3b7e67dc083e

1/**
2 * simplemde v1.11.2
3 * Copyright Next Step Webs, Inc.
4 * @link https://github.com/NextStepWebs/simplemde-markdown-editor
5 * @license MIT
6 */
7(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.SimpleMDE = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
8'use strict'
9
10exports.toByteArray = toByteArray
11exports.fromByteArray = fromByteArray
12
13var lookup = []
14var revLookup = []
15var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
16
17function init () {
18  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
19  for (var i = 0, len = code.length; i < len; ++i) {
20    lookup[i] = code[i]
21    revLookup[code.charCodeAt(i)] = i
22  }
23
24  revLookup['-'.charCodeAt(0)] = 62
25  revLookup['_'.charCodeAt(0)] = 63
26}
27
28init()
29
30function toByteArray (b64) {
31  var i, j, l, tmp, placeHolders, arr
32  var len = b64.length
33
34  if (len % 4 > 0) {
35    throw new Error('Invalid string. Length must be a multiple of 4')
36  }
37
38  // the number of equal signs (place holders)
39  // if there are two placeholders, than the two characters before it
40  // represent one byte
41  // if there is only one, then the three characters before it represent 2 bytes
42  // this is just a cheap hack to not do indexOf twice
43  placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
44
45  // base64 is 4/3 + up to two characters of the original data
46  arr = new Arr(len * 3 / 4 - placeHolders)
47
48  // if there are placeholders, only get up to the last complete 4 chars
49  l = placeHolders > 0 ? len - 4 : len
50
51  var L = 0
52
53  for (i = 0, j = 0; i < l; i += 4, j += 3) {
54    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
55    arr[L++] = (tmp >> 16) & 0xFF
56    arr[L++] = (tmp >> 8) & 0xFF
57    arr[L++] = tmp & 0xFF
58  }
59
60  if (placeHolders === 2) {
61    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
62    arr[L++] = tmp & 0xFF
63  } else if (placeHolders === 1) {
64    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
65    arr[L++] = (tmp >> 8) & 0xFF
66    arr[L++] = tmp & 0xFF
67  }
68
69  return arr
70}
71
72function tripletToBase64 (num) {
73  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
74}
75
76function encodeChunk (uint8, start, end) {
77  var tmp
78  var output = []
79  for (var i = start; i < end; i += 3) {
80    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
81    output.push(tripletToBase64(tmp))
82  }
83  return output.join('')
84}
85
86function fromByteArray (uint8) {
87  var tmp
88  var len = uint8.length
89  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
90  var output = ''
91  var parts = []
92  var maxChunkLength = 16383 // must be multiple of 3
93
94  // go through the array every three bytes, we'll deal with trailing stuff later
95  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
96    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
97  }
98
99  // pad the end with zeros, but make sure to not forget the extra bytes
100  if (extraBytes === 1) {
101    tmp = uint8[len - 1]
102    output += lookup[tmp >> 2]
103    output += lookup[(tmp << 4) & 0x3F]
104    output += '=='
105  } else if (extraBytes === 2) {
106    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
107    output += lookup[tmp >> 10]
108    output += lookup[(tmp >> 4) & 0x3F]
109    output += lookup[(tmp << 2) & 0x3F]
110    output += '='
111  }
112
113  parts.push(output)
114
115  return parts.join('')
116}
117
118},{}],2:[function(require,module,exports){
119
120},{}],3:[function(require,module,exports){
121(function (global){
122/*!
123 * The buffer module from node.js, for the browser.
124 *
125 * @author   Feross Aboukhadijeh <[email protected]> <http://feross.org>
126 * @license  MIT
127 */
128/* eslint-disable no-proto */
129
130'use strict'
131
132var base64 = require('base64-js')
133var ieee754 = require('ieee754')
134var isArray = require('isarray')
135
136exports.Buffer = Buffer
137exports.SlowBuffer = SlowBuffer
138exports.INSPECT_MAX_BYTES = 50
139
140/**
141 * If `Buffer.TYPED_ARRAY_SUPPORT`:
142 *   === true    Use Uint8Array implementation (fastest)
143 *   === false   Use Object implementation (most compatible, even IE6)
144 *
145 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
146 * Opera 11.6+, iOS 4.2+.
147 *
148 * Due to various browser bugs, sometimes the Object implementation will be used even
149 * when the browser supports typed arrays.
150 *
151 * Note:
152 *

153 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
154 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
155 *
156 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
157 *
158 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
159 *     incorrect length in some situations.
160
161 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
162 * get the Object implementation, which is slower but behaves correctly.
163 */
164Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
165  ? global.TYPED_ARRAY_SUPPORT
166  : typedArraySupport()
167
168/*
169 * Export kMaxLength after typed array support is determined.
170 */
171exports.kMaxLength = kMaxLength()
172
173function typedArraySupport () {
174  try {
175    var arr = new Uint8Array(1)
176    arr.foo = function () { return 42 }
177    return arr.foo() === 42 && // typed array instances can be augmented
178        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
179        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
180  } catch (e) {
181    return false
182  }
183}
184
185function kMaxLength () {
186  return Buffer.TYPED_ARRAY_SUPPORT
187    ? 0x7fffffff
188    : 0x3fffffff
189}
190
191function createBuffer (that, length) {
192  if (kMaxLength() < length) {
193    throw new RangeError('Invalid typed array length')
194  }
195  if (Buffer.TYPED_ARRAY_SUPPORT) {
196    // Return an augmented `Uint8Array` instance, for best performance
197    that = new Uint8Array(length)
198    that.__proto__ = Buffer.prototype
199  } else {
200    // Fallback: Return an object instance of the Buffer class
201    if (that === null) {
202      that = new Buffer(length)
203    }
204    that.length = length
205  }
206
207  return that
208}
209
210/**
211 * The Buffer constructor returns instances of `Uint8Array` that have their
212 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
213 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
214 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
215 * returns a single octet.
216 *
217 * The `Uint8Array` prototype remains unmodified.
218 */
219
220function Buffer (arg, encodingOrOffset, length) {
221  if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
222    return new Buffer(arg, encodingOrOffset, length)
223  }
224
225  // Common case.
226  if (typeof arg === 'number') {
227    if (typeof encodingOrOffset === 'string') {
228      throw new Error(
229        'If encoding is specified then the first argument must be a string'
230      )
231    }
232    return allocUnsafe(this, arg)
233  }
234  return from(this, arg, encodingOrOffset, length)
235}
236
237Buffer.poolSize = 8192 // not used by this implementation
238
239// TODO: Legacy, not needed anymore. Remove in next major version.
240Buffer._augment = function (arr) {
241  arr.__proto__ = Buffer.prototype
242  return arr
243}
244
245function from (that, value, encodingOrOffset, length) {
246  if (typeof value === 'number') {
247    throw new TypeError('"value" argument must not be a number')
248  }
249
250  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
251    return fromArrayBuffer(that, value, encodingOrOffset, length)
252  }
253
254  if (typeof value === 'string') {
255    return fromString(that, value, encodingOrOffset)
256  }
257
258  return fromObject(that, value)
259}
260
261/**
262 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
263 * if value is a number.
264 * Buffer.from(str[, encoding])
265 * Buffer.from(array)
266 * Buffer.from(buffer)
267 * Buffer.from(arrayBuffer[, byteOffset[, length]])
268 **/
269Buffer.from = function (value, encodingOrOffset, length) {
270  return from(null, value, encodingOrOffset, length)
271}
272
273if (Buffer.TYPED_ARRAY_SUPPORT) {
274  Buffer.prototype.__proto__ = Uint8Array.prototype
275  Buffer.__proto__ = Uint8Array
276  if (typeof Symbol !== 'undefined' && Symbol.species &&
277      Buffer[Symbol.species] === Buffer) {
278    // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
279    Object.defineProperty(Buffer, Symbol.species, {
280      value: null,
281      configurable: true
282    })
283  }
284}
285
286function assertSize (size) {
287  if (typeof size !== 'number') {
288    throw new TypeError('"size" argument must be a number')
289  }
290}
291
292function alloc (that, size, fill, encoding) {
293  assertSize(size)
294  if (size <= 0) {
295    return createBuffer(that, size)
296  }
297  if (fill !== undefined) {
298    // Only pay attention to encoding if it's a string. This
299    // prevents accidentally sending in a number that would
300    // be interpretted as a start offset.
301    return typeof encoding === 'string'
302      ? createBuffer(that, size).fill(fill, encoding)
303      : createBuffer(that, size).fill(fill)
304  }
305  return createBuffer(that, size)
306}
307
308/**
309 * Creates a new filled Buffer instance.
310 * alloc(size[, fill[, encoding]])
311 **/
312Buffer.alloc = function (size, fill, encoding) {
313  return alloc(null, size, fill, encoding)
314}
315
316function allocUnsafe (that, size) {
317  assertSize(size)
318  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
319  if (!Buffer.TYPED_ARRAY_SUPPORT) {
320    for (var i = 0; i < size; i++) {
321      that[i] = 0
322    }
323  }
324  return that
325}
326
327/**
328 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
329 * */
330Buffer.allocUnsafe = function (size) {
331  return allocUnsafe(null, size)
332}
333/**
334 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
335 */
336Buffer.allocUnsafeSlow = function (size) {
337  return allocUnsafe(null, size)
338}
339
340function fromString (that, string, encoding) {
341  if (typeof encoding !== 'string' || encoding === '') {
342    encoding = 'utf8'
343  }
344
345  if (!Buffer.isEncoding(encoding)) {
346    throw new TypeError('"encoding" must be a valid string encoding')
347  }
348
349  var length = byteLength(string, encoding) | 0
350  that = createBuffer(that, length)
351
352  that.write(string, encoding)
353  return that
354}
355
356function fromArrayLike (that, array) {
357  var length = checked(array.length) | 0
358  that = createBuffer(that, length)
359  for (var i = 0; i < length; i += 1) {
360    that[i] = array[i] & 255
361  }
362  return that
363}
364
365function fromArrayBuffer (that, array, byteOffset, length) {
366  array.byteLength // this throws if `array` is not a valid ArrayBuffer
367
368  if (byteOffset < 0 || array.byteLength < byteOffset) {
369    throw new RangeError('\'offset\' is out of bounds')
370  }
371
372  if (array.byteLength < byteOffset + (length || 0)) {
373    throw new RangeError('\'length\' is out of bounds')
374  }
375
376  if (length === undefined) {
377    array = new Uint8Array(array, byteOffset)
378  } else {
379    array = new Uint8Array(array, byteOffset, length)
380  }
381
382  if (Buffer.TYPED_ARRAY_SUPPORT) {
383    // Return an augmented `Uint8Array` instance, for best performance
384    that = array
385    that.__proto__ = Buffer.prototype
386  } else {
387    // Fallback: Return an object instance of the Buffer class
388    that = fromArrayLike(that, array)
389  }
390  return that
391}
392
393function fromObject (that, obj) {
394  if (Buffer.isBuffer(obj)) {
395    var len = checked(obj.length) | 0
396    that = createBuffer(that, len)
397
398    if (that.length === 0) {
399      return that
400    }
401
402    obj.copy(that, 0, 0, len)
403    return that
404  }
405
406  if (obj) {
407    if ((typeof ArrayBuffer !== 'undefined' &&
408        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
409      if (typeof obj.length !== 'number' || isnan(obj.length)) {
410        return createBuffer(that, 0)
411      }
412      return fromArrayLike(that, obj)
413    }
414
415    if (obj.type === 'Buffer' && isArray(obj.data)) {
416      return fromArrayLike(that, obj.data)
417    }
418  }
419
420  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
421}
422
423function checked (length) {
424  // Note: cannot use `length < kMaxLength` here because that fails when
425  // length is NaN (which is otherwise coerced to zero.)
426  if (length >= kMaxLength()) {
427    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
428                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
429  }
430  return length | 0
431}
432
433function SlowBuffer (length) {
434  if (+length != length) { // eslint-disable-line eqeqeq
435    length = 0
436  }
437  return Buffer.alloc(+length)
438}
439
440Buffer.isBuffer = function isBuffer (b) {
441  return !!(b != null && b._isBuffer)
442}
443
444Buffer.compare = function compare (a, b) {
445  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
446    throw new TypeError('Arguments must be Buffers')
447  }
448
449  if (a === b) return 0
450
451  var x = a.length
452  var y = b.length
453
454  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
455    if (a[i] !== b[i]) {
456      x = a[i]
457      y = b[i]
458      break
459    }
460  }
461
462  if (x < y) return -1
463  if (y < x) return 1
464  return 0
465}
466
467Buffer.isEncoding = function isEncoding (encoding) {
468  switch (String(encoding).toLowerCase()) {
469    case 'hex':
470    case 'utf8':
471    case 'utf-8':
472    case 'ascii':
473    case 'binary':
474    case 'base64':
475    case 'raw':
476    case 'ucs2':
477    case 'ucs-2':
478    case 'utf16le':
479    case 'utf-16le':
480      return true
481    default:
482      return false
483  }
484}
485
486Buffer.concat = function concat (list, length) {
487  if (!isArray(list)) {
488    throw new TypeError('"list" argument must be an Array of Buffers')
489  }
490
491  if (list.length === 0) {
492    return Buffer.alloc(0)
493  }
494
495  var i
496  if (length === undefined) {
497    length = 0
498    for (i = 0; i < list.length; i++) {
499      length += list[i].length
500    }
501  }
502
503  var buffer = Buffer.allocUnsafe(length)
504  var pos = 0
505  for (i = 0; i < list.length; i++) {
506    var buf = list[i]
507    if (!Buffer.isBuffer(buf)) {
508      throw new TypeError('"list" argument must be an Array of Buffers')
509    }
510    buf.copy(buffer, pos)
511    pos += buf.length
512  }
513  return buffer
514}
515
516function byteLength (string, encoding) {
517  if (Buffer.isBuffer(string)) {
518    return string.length
519  }
520  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&

521      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
522    return string.byteLength
523  }
524  if (typeof string !== 'string') {
525    string = '' + string
526  }
527
528  var len = string.length
529  if (len === 0) return 0
530
531  // Use a for loop to avoid recursion
532  var loweredCase = false
533  for (;;) {
534    switch (encoding) {
535      case 'ascii':
536      case 'binary':
537      // Deprecated
538      case 'raw':
539      case 'raws':
540        return len
541      case 'utf8':
542      case 'utf-8':
543      case undefined:
544        return utf8ToBytes(string).length
545      case 'ucs2':
546      case 'ucs-2':
547      case 'utf16le':
548      case 'utf-16le':
549        return len * 2
550      case 'hex':
551        return len >>> 1
552      case 'base64':
553        return base64ToBytes(string).length
554      default:
555        if (loweredCase) return utf8ToBytes(string).length // assume utf8
556        encoding = ('' + encoding).toLowerCase()
557        loweredCase = true
558    }
559  }
560}
561Buffer.byteLength = byteLength
562
563function slowToString (encoding, start, end) {
564  var loweredCase = false
565
566  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
567  // property of a typed array.
568
569  // This behaves neither like String nor Uint8Array in that we set start/end
570  // to their upper/lower bounds if the value passed is out of range.
571  // undefined is handled specially as per ECMA-262 6th Edition,
572  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
573  if (start === undefined || start < 0) {
574    start = 0
575  }
576  // Return early if start > this.length. Done here to prevent potential uint32
577  // coercion fail below.
578  if (start > this.length) {
579    return ''
580  }
581
582  if (end === undefined || end > this.length) {
583    end = this.length
584  }
585
586  if (end <= 0) {
587    return ''
588  }
589
590  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
591  end >>>= 0
592  start >>>= 0
593
594  if (end <= start) {
595    return ''
596  }
597
598  if (!encoding) encoding = 'utf8'
599
600  while (true) {
601    switch (encoding) {
602      case 'hex':
603        return hexSlice(this, start, end)
604
605      case 'utf8':
606      case 'utf-8':
607        return utf8Slice(this, start, end)
608
609      case 'ascii':
610        return asciiSlice(this, start, end)
611
612      case 'binary':
613        return binarySlice(this, start, end)
614
615      case 'base64':
616        return base64Slice(this, start, end)
617
618      case 'ucs2':
619      case 'ucs-2':
620      case 'utf16le':
621      case 'utf-16le':
622        return utf16leSlice(this, start, end)
623
624      default:
625        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
626        encoding = (encoding + '').toLowerCase()
627        loweredCase = true
628    }
629  }
630}
631
632// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
633// Buffer instances.
634Buffer.prototype._isBuffer = true
635
636function swap (b, n, m) {
637  var i = b[n]
638  b[n] = b[m]
639  b[m] = i
640}
641
642Buffer.prototype.swap16 = function swap16 () {
643  var len = this.length
644  if (len % 2 !== 0) {
645    throw new RangeError('Buffer size must be a multiple of 16-bits')
646  }
647  for (var i = 0; i < len; i += 2) {
648    swap(this, i, i + 1)
649  }
650  return this
651}
652
653Buffer.prototype.swap32 = function swap32 () {
654  var len = this.length
655  if (len % 4 !== 0) {
656    throw new RangeError('Buffer size must be a multiple of 32-bits')
657  }
658  for (var i = 0; i < len; i += 4) {
659    swap(this, i, i + 3)
660    swap(this, i + 1, i + 2)
661  }
662  return this
663}
664
665Buffer.prototype.toString = function toString () {
666  var length = this.length | 0
667  if (length === 0) return ''
668  if (arguments.length === 0) return utf8Slice(this, 0, length)
669  return slowToString.apply(this, arguments)
670}
671
672Buffer.prototype.equals = function equals (b) {
673  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
674  if (this === b) return true
675  return Buffer.compare(this, b) === 0
676}
677
678Buffer.prototype.inspect = function inspect () {
679  var str = ''
680  var max = exports.INSPECT_MAX_BYTES
681  if (this.length > 0) {
682    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
683    if (this.length > max) str += ' ... '
684  }
685  return '<Buffer ' + str + '>'
686}
687
688Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
689  if (!Buffer.isBuffer(target)) {
690    throw new TypeError('Argument must be a Buffer')
691  }
692
693  if (start === undefined) {
694    start = 0
695  }
696  if (end === undefined) {
697    end = target ? target.length : 0
698  }
699  if (thisStart === undefined) {
700    thisStart = 0
701  }
702  if (thisEnd === undefined) {
703    thisEnd = this.length
704  }
705
706  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
707    throw new RangeError('out of range index')
708  }
709
710  if (thisStart >= thisEnd && start >= end) {
711    return 0
712  }
713  if (thisStart >= thisEnd) {
714    return -1
715  }
716  if (start >= end) {
717    return 1
718  }
719
720  start >>>= 0
721  end >>>= 0
722  thisStart >>>= 0
723  thisEnd >>>= 0
724
725  if (this === target) return 0
726
727  var x = thisEnd - thisStart

809s
810    if (val.length === 0) {
811      return -1
812    }
813    return arrayIndexOf(this, val, byteOffset, encoding)
814  }
815  if (typeof val === 'number') {
816    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
817      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
818    }
819    return arrayIndexOf(this, [ val ], byteOffset, encoding)
820  }
821
822  throw new TypeError('val must be string, number or Buffer')
823}
824
825Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
826  return this.indexOf(val, byteOffset, encoding) !== -1
827}
828
829function hexWrite (buf, string, offset, length) {
830  offset = Number(offset) || 0
831  var remaining = buf.length - offset
832  if (!length) {
833    length = remaining
834  } else {
835    length = Number(length)
836    if (length > remaining) {
837      length = remaining
838    }
839  }
840
841  // must be an even number of digits
842  var strLen = string.length
843  if (strLen % 2 !== 0) throw new Error('Invalid hex string')
844
845  if (length > strLen / 2) {
846    length = strLen / 2
847  }
848  for (var i = 0; i < length; i++) {
849    var parsed = parseInt(string.substr(i * 2, 2), 16)
850    if (isNaN(parsed)) return i
851    buf[offset + i] = parsed
852  }
853  return i
854}
855
856function utf8Write (buf, string, offset, length) {
857  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
858}
859
860function asciiWrite (buf, string, offset, length) {
861  return blitBuffer(asciiToBytes(string), buf, offset, length)
862}
863
864function binaryWrite (buf, string, offset, length) {
865  return asciiWrite(buf, string, offset, length)
866}
867
868function base64Write (buf, string, offset, length) {
869  return blitBuffer(base64ToBytes(string), buf, offset, length)
870}
871
872function ucs2Write (buf, string, offset, length) {
873  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
874}
875
876Buffer.prototype.write = function write (string, offset, length, encoding) {
877  // Buffer#write(string)
878  if (offset === undefined) {
879    encoding = 'utf8'
880    length = this.length
881    offset = 0
882  // Buffer#write(string, encoding)
883  } else if (length === undefined && typeof offset === 'string') {
884    encoding = offset
885    length = this.length
886    offset = 0
887  // Buffer#write(string, offset[, length][, encoding])
888  } else if (isFinite(offset)) {
889    offset = offset | 0
890    if (isFinite(length)) {
891      length = length | 0
892      if (encoding === undefined) encoding = 'utf8'
893    } else {
894      encoding = length
895      length = undefined
896    }
897  // legacy write(string, encoding, offset, length) - remove in v0.13
898  } else {
899    throw new Error(
900      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
901    )
902  }
903
904  var remaining = this.length - offset
905  if (length === undefined || length > remaining) length = remaining
906
907  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
908    throw new RangeError('Attempt to write outside buffer bounds')
909  }
910
911  if (!encoding) encoding = 'utf8'
912
913  var loweredCase = false
914  for (;;) {
915    switch (encoding) {
916      case 'hex':
917        return hexWrite(this, string, offset, length)
918
919      case 'utf8':
920      case 'utf-8':
921        return utf8Write(this, string, offset, length)
922
923      case 'ascii':
924        return asciiWrite(this, string, offset, length)
925
926      case 'binary':
927        return binaryWrite(this, string, offset, length)
928
929      case 'base64':
930        // Warning: maxLength not taken into account in base64Write
931        return base64Write(this, string, offset, length)
932
933      case 'ucs2':
934      case 'ucs-2':
935      case 'utf16le':
936      case 'utf-16le':
937        return ucs2Write(this, string, offset, length)
938
939      default:
940        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
941        encoding = ('' + encoding).toLowerCase()
942        loweredCase = true
943    }
944  }
945}
946
947Buffer.prototype.toJSON = function toJSON () {
948  return {
949    type: 'Buffer',
950    data: Array.prototype.slice.call(this._arr || this, 0)
951  }
952}
953
954function base64Slice (buf, start, end) {
955  if (start === 0 && end === buf.length) {
956    return base64.fromByteArray(buf)
957  } else {
958    return base64.fromByteArray(buf.slice(start, end))
959  }
960}
961
962function utf8Slice (buf, start, end) {
963  end = Math.min(buf.length, end)
964  var res = []
965
966  var i = start
967  while (i < end) {
968    var firstByte = buf[i]
969    var codePoint = null
970    var bytesPerSequence = (firstByte > 0xEF) ? 4
971      : (firstByte > 0xDF) ? 3
972      : (firstByte > 0xBF) ? 2
973      : 1
974
975    if (i + bytesPerSequence <= end) {
976      var secondByte, thirdByte, fourthByte, tempCodePoint
977
978      switch (bytesPerSequence) {
979        case 1:
980          if (firstByte < 0x80) {
981            codePoint = firstByte
982          }
983          break
984        case 2:
985          secondByte = buf[i + 1]
986          if ((secondByte & 0xC0) === 0x80) {
987            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
988            if (tempCodePoint > 0x7F) {
989              codePoint = tempCodePoint
990            }
991          }
992          break
993        case 3:
994          secondByte = buf[i + 1]
995          thirdByte = buf[i + 2]
996          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
997            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
998            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
999              codePoint = tempCodePoint
1000            }
1001          }
1002          break
1003        case 4:
1004          secondByte = buf[i + 1]
1005          thirdByte = buf[i + 2]
1006          fourthByte = buf[i + 3]
1007          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
1008            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
1009            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
1010              codePoint = tempCodePoint
1011            }
1012          }
1013      }
1014    }
1015
1016    if (codePoint === null) {
1017      // we did not generate a valid codePoint so insert a
1018      // replacement char (U+FFFD) and advance only 1 byte
1019      codePoint = 0xFFFD
1020      bytesPerSequence = 1
1021    } else if (codePoint > 0xFFFF) {
1022      // encode to utf16 (surrogate pair dance)
1023      codePoint -= 0x10000
1024      res.push(codePoint >>>

1024 10 & 0x3FF | 0xD800)
1025      codePoint = 0xDC00 | codePoint & 0x3FF
1026    }
1027
1028    res.push(codePoint)
1029    i += bytesPerSequence
1030  }
1031
1032  return decodeCodePointsArray(res)
1033}
1034
1035// Based on http://stackoverflow.com/a/22747272/680742, the browser with
1036// the lowest limit is Chrome, with 0x10000 args.
1037// We go 1 magnitude less, for safety
1038var MAX_ARGUMENTS_LENGTH = 0x1000
1039
1040function decodeCodePointsArray (codePoints) {
1041  var len = codePoints.length
1042  if (len <= MAX_ARGUMENTS_LENGTH) {
1043    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
1044  }
1045
1046  // Decode in chunks to avoid "call stack size exceeded".
1047  var res = ''
1048  var i = 0
1049  while (i < len) {
1050    res += String.fromCharCode.apply(
1051      String,
1052      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
1053    )
1054  }
1055  return res
1056}
1057
1058function asciiSlice (buf, start, end) {
1059  var ret = ''
1060  end = Math.min(buf.length, end)
1061
1062  for (var i = start; i < end; i++) {
1063    ret += String.fromCharCode(buf[i] & 0x7F)
1064  }
1065  return ret
1066}
1067
1068function binarySlice (buf, start, end) {
1069  var ret = ''
1070  end = Math.min(buf.length, end)
1071
1072  for (var i = start; i < end; i++) {
1073    ret += String.fromCharCode(buf[i])
1074  }
1075  return ret
1076}
1077
1078function hexSlice (buf, start, end) {
1079  var len = buf.length
1080
1081  if (!start || start < 0) start = 0
1082  if (!end || end < 0 || end > len) end = len
1083
1084  var out = ''
1085  for (var i = start; i < end; i++) {
1086    out += toHex(buf[i])
1087  }
1088  return out
1089}
1090
1091function utf16leSlice (buf, start, end) {
1092  var bytes = buf.slice(start, end)
1093  var res = ''
1094  for (var i = 0; i < bytes.length; i += 2) {
1095    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
1096  }
1097  return res
1098}
1099
1100Buffer.prototype.slice = function slice (start, end) {
1101  var len = this.length
1102  start = ~~start
1103  end = end === undefined ? len : ~~end
1104
1105  if (start < 0) {
1106    start += len
1107    if (start < 0) start = 0
1108  } else if (start > len) {
1109    start = len
1110  }
1111
1112  if (end < 0) {
1113    end += len
1114    if (end < 0) end = 0
1115  } else if (end > len) {
1116    end = len
1117  }
1118
1119  if (end < start) end = start
1120
1121  var newBuf
1122  if (Buffer.TYPED_ARRAY_SUPPORT) {
1123    newBuf = this.subarray(start, end)
1124    newBuf.__proto__ = Buffer.prototype
1125  } else {
1126    var sliceLen = end - start
1127    newBuf = new Buffer(sliceLen, undefined)
1128    for (var i = 0; i < sliceLen; i++) {
1129      newBuf[i] = this[i + start]
1130    }
1131  }
1132
1133  return newBuf
1134}
1135
1136/*
1137 * Need to make sure that buffer isn't trying to write out of bounds.
1138 */

1139function checkOffset (offset, ext, length) {
1140  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
1141  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
1142}
1143
1144Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
1145  offset = offset | 0
1146  byteLength = byteLength | 0
1147  if (!noAssert) checkOffset(offset, byteLength, this.length)
1148
1149  var val = this[offset]
1150  var mul = 1
1151  var i = 0
1152  while (++i < byteLength && (mul *= 0x100)) {
1153    val += this[offset + i] * mul
1154  }
1155
1156  return val
1157}
1158
1159Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
1160  offset = offset | 0
1161  byteLength = byteLength | 0
1162  if (!noAssert) {
1163    checkOffset(offset, byteLength, this.length)
1164  }
1165
1166  var val = this[offset + --byteLength]
1167  var mul = 1
1168  while (byteLength > 0 && (mul *= 0x100)) {
1169    val += this[offset + --byteLength] * mul
1170  }
1171
1172  return val
1173}
1174
1175Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
1176  if (!noAssert) checkOffset(offset, 1, this.length)
1177  return this[offset]
1178}
1179
1180Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
1181  if (!noAssert) checkOffset(offset, 2, this.length)
1182  return this[offset] | (this[offset + 1] << 8)
1183}
1184
1185Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
1186  if (!noAssert) checkOffset(offset, 2, this.length)
1187  return (this[offset] << 8) | this[offset + 1]
1188}
1189
1190Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
1191  if (!noAssert) checkOffset(offset, 4, this.length)
1192
1193  return ((this[offset]) |
1194      (this[offset + 1] << 8) |
1195      (this[offset + 2] << 16)) +
1196      (this[offset + 3] * 0x1000000)
1197}
1198
1199Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
1200  if (!noAssert) checkOffset(offset, 4, this.length)
1201
1202  return (this[offset] * 0x1000000) +
1203    ((this[offset + 1] << 16) |
1204    (this[offset + 2] << 8) |
1205    this[offset + 3])
1206}
1207
1208Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
1209  offset = offset | 0
1210  byteLength = byteLength | 0
1211  if (!noAssert) checkOffset(offset, byteLength, this.length)
1212
1213  var val = this[offset]
1214  var mul = 1
1215  var i = 0
1216  while (++i < byteLength && (mul *= 0x100)) {
1217    val += this[offset + i] * mul
1218  }
1219  mul *= 0x80
1220
1221  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
1222
1223  return val
1224}
1225
1226Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
1227  offset = offset | 0
1228  byteLength = byteLength | 0
1229  if (!noAssert) checkOffset(offset, byteLength, this.length)
1230
1231  var i = byteLength
1232  var mul = 1
1233  var val = this[offset + --i]
1234  while (i > 0 && (mul *= 0x100)) {
1235    val += this[offset + --i] * mul
1236  }
1237  mul *= 0x80
1238
1239  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
1240
1241  return val
1242}
1243
1244Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
1245  if (!noAssert) checkOffset(offset, 1, this.length)
1246  if (!(this[offset] & 0x80)) return (this[offset])
1247  return ((0xff - this[offset] + 1) * -1)
1248}
1249
1250Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
1251  if (!noAssert) checkOffset(offset, 2, this.length)
1252  var val = this[offset] | (this[offset + 1] << 8)
1253  return (val & 0x8000) ? val | 0xFFFF0000 : val
1254}
1255
1256Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
1257  if (!noAssert) checkOffset(offset, 2, this.length)
1258  var val = this[offset + 1] | (this[offset] << 8)
1259  return (val & 0x8000) ? val | 0xFFFF0000 : val
1260}
1261
1262Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
1263  if (!noAssert) checkOffset(offset, 4, this.length)
1264
1265  return (this[offset]) |
1266    (this[offset + 1] << 8) |
1267    (this[offset + 2] << 16) |
1268    (this[offset + 3] << 24)
1269}
1270
1271Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
1272  if (!noAssert) checkOffset(offset, 4, this.length)
1273
1274  return (this[offset] << 24) |
1275    (this[offset + 1] << 16) |
1276    (this[offset + 2] << 8) |
1277    (this[offset + 3])
1278}
1279
1280Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
1281  if (!noAssert) checkOffset(offset, 4, this.length)
1282  return ieee754.read(this, offset, true, 23, 4)
1283}
1284
1285Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
1286  if (!noAssert) checkOffset(offset, 4, this.length)
1287  return ieee754.read(this, offset, false, 23, 4)
1288}
1289
1290Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
1291  if (!noAssert) checkOffset(offset, 8, this.length)
1292  return ieee754.read(this, offset, true, 52, 8)
1293}
1294
1295Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
1296  if (!noAssert) checkOffset(offset, 8, this.length)
1297  return ieee754.read(this, offset, false, 52, 8)
1298}
1299
1300function checkInt (buf, value, offset, ext, max, min) {
1301  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
1302  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
1303  if (offset + ext > buf.length) throw new RangeError('Index out of range')
1304}
1305
1306Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
1307  value = +value
1308  offset = offset | 0
1309  byteLength = byteLength | 0
1310  if (!noAssert) {
1311    var maxBytes = Math.pow(2, 8 * byteLength) - 1
1312    checkInt(this, value, offset, byteLength, maxBytes, 0)
1313  }
1314
1315  var mul = 1
1316  var i = 0
1317  this[offset] = value & 0xFF
1318  while (++i < byteLength && (mul *= 0x100)) {
1319    this[offset + i] = (value / mul) & 0xFF
1320  }
1321
1322  return offset + byteLength
1323}
1324
1325Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
1326  value = +value
1327  offset = offset | 0
1328  byteLength = byteLength | 0
1329  if (!noAssert) {
1330    var maxBytes = Math.pow(2, 8 * byteLength) - 1
1331    checkInt(this, value, offset, byteLength, maxBytes, 0)
1332  }
1333
1334  var i = byteLength - 1
1335  var mul = 1
1336  this[offset + i] = value & 0xFF
1337  while (--i >= 0 && (mul *= 0x100)) {
1338    this[offset + i] = (value / mul) & 0xFF
1339  }
1340
1341  return offset + byteLength
1342}
1343
1344Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
1345  value = +value
1346  offset = offset | 0
1347  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
1348  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
1349  this[offset] = (value & 0xff)
1350  return offset + 1
1351}
1352
1353function objectWriteUInt16 (buf, value, offset, littleEndian) {
1354  if (value < 0) value = 0xffff + value + 1
1355  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
1356    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
1357      (littleEndian ? i : 1 - i) * 8
1358  }
1359}
1360
1361Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
1362  value = +value
1363  offset = offset | 0
1364  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
1365  if (Buffer.TYPED_ARRAY_SUPPORT) {
1366    this[offset] = (value & 0xff)
1367    this[offset + 1] = (value >>> 8)
1368  } else {
1369    objectWriteUInt16(this, value, offset, true)
1370  }
1371  return offset + 2
1372}
1373
1374Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
1375  value = +value
1376  offset = offset | 0
1377  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
1378  if (Buffer.TYPED_ARRAY_SUPPORT) {
1379    this[offset] = (value >>> 8)
1380    this[offset + 1] = (value & 0xff)
1381  } else {
1382    objectWriteUInt16(this, value, offset, false)
1383  }
1384  return offset + 2
1385}
1386
1387function objectWriteUInt32 (buf, value, offset, littleEndian) {
1388  if (value < 0) value = 0xffffffff + value + 1
1389  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++

1389) {
1390    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
1391  }
1392}
1393
1394Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
1395  value = +value
1396  offset = offset | 0
1397  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
1398  if (Buffer.TYPED_ARRAY_SUPPORT) {
1399    this[offset + 3] = (value >>> 24)
1400    this[offset + 2] = (value >>> 16)
1401    this[offset + 1] = (value >>> 8)
1402    this[offset] = (value & 0xff)
1403  } else {
1404    objectWriteUInt32(this, value, offset, true)
1405  }
1406  return offset + 4
1407}
1408
1409Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
1410  value = +value
1411  offset = offset | 0
1412  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
1413  if (Buffer.TYPED_ARRAY_SUPPORT) {
1414    this[offset] = (value >>> 24)
1415    this[offset + 1] = (value >>> 16)
1416    this[offset + 2] = (value >>> 8)
1417    this[offset + 3] = (value & 0xff)
1418  } else {
1419    objectWriteUInt32(this, value, offset, false)
1420  }
1421  return offset + 4
1422}
1423
1424Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
1425  value = +value
1426  offset = offset | 0
1427  if (!noAssert) {
1428    var limit = Math.pow(2, 8 * byteLength - 1)
1429
1430    checkInt(this, value, offset, byteLength, limit - 1, -limit)
1431  }
1432
1433  var i = 0
1434  var mul = 1
1435  var sub = 0
1436  this[offset] = value & 0xFF
1437  while (++i < byteLength && (mul *= 0x100)) {
1438    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
1439      sub = 1
1440    }
1441    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
1442  }
1443
1444  return offset + byteLength
1445}
1446
1447Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
1448  value = +value
1449  offset = offset | 0
1450  if (!noAssert) {
1451    var limit = Math.pow(2, 8 * byteLength - 1)
1452
1453    checkInt(this, value, offset, byteLength, limit - 1, -limit)
1454  }
1455
1456  var i = byteLength - 1
1457  var mul = 1
1458  var sub = 0
1459  this[offset + i] = value & 0xFF
1460  while (--i >= 0 && (mul *= 0x100)) {
1461    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
1462      sub = 1
1463    }
1464    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
1465  }
1466
1467  return offset + byteLength
1468}
1469
1470Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
1471  value = +value
1472  offset = offset | 0
1473  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
1474  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
1475  if (value < 0) value = 0xff + value + 1
1476  this[offset] = (value & 0xff)
1477  return offset + 1
1478}
1479
1480Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
1481  value = +value
1482  offset = offset | 0
1483  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
1484  if (Buffer.TYPED_ARRAY_SUPPORT) {
1485    this[offset] = (value & 0xff)
1486    this[offset + 1] = (value >>> 8)
1487  } else {
1488    objectWriteUInt16(this, value, offset, true)
1489  }
1490  return offset + 2
1491}
1492
1493Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
1494  value = +value
1495  offset = offset | 0
1496  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
1497  if (Buffer.TYPED_ARRAY_SUPPORT) {
1498    this[offset] = (value >>> 8)
1499    this[offset + 1] = (value & 0xff)
1500  } else {
1501    objectWriteUInt16(this, value, offset, false)
1502  }
1503  return offset + 2
1504}
1505
1506Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
1507  value = +value
1508  offset = offset | 0
1509  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
1510  if (Buffer.TYPED_ARRAY_SUPPORT) {
1511    this[offset] = (value & 0xff)
1512    this[offset + 1] = (value >>> 8)
1513    this[offset + 2] = (value >>> 16)
1514    this[offset + 3] = (value >>> 24)
1515  } else {
1516    objectWriteUInt32(this, value, offset, true)
1517  }
1518  return offset + 4
1519}
1520
1521Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
1522  value = +value
1523  offset = offset | 0
1524  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
1525  if (value < 0) value = 0xffffffff + value + 1
1526  if (Buffer.TYPED_ARRAY_SUPPORT) {
1527    this[offset] = (value >>> 24)
1528    this[offset + 1] = (value >>> 16)
1529    this[offset + 2] = (value >>> 8)
1530    this[offset + 3] = (value & 0xff)
1531  } else {
1532    objectWriteUInt32(this, value, offset, false)
1533  }
1534  return offset + 4
1535}
1536
1537function checkIEEE754 (buf, value, offset, ext, max, min) {
1538  if (offset + ext > buf.length) throw new RangeError('Index out of range')
1539  if (offset < 0) throw new RangeError('Index out of range')
1540}
1541
1542function writeFloat (buf, value, offset, littleEndian, noAssert) {
1543  if (!noAssert) {
1544    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
1545  }
1546  ieee754.write(buf, value, offset, littleEndian, 23, 4)
1547  return offset + 4
1548}
1549
1550Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
1551  return writeFloat(this, value, offset, true, noAssert)
1552}
1553
1554Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
1555  return writeFloat(this, value, offset, false, noAssert)
1556}
1557
1558function writeDouble (buf, value, offset, littleEndian, noAssert) {
1559  if (!noAssert) {
1560    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
1561  }
1562  ieee754.write(buf, value, offset, littleEndian, 52, 8)
1563  return offset + 8
1564}
1565
1566Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
1567  return writeDouble(this, value, offset, true, noAssert)
1568}
1569
1570Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
1571  return writeDouble(this, value, offset, false, noAssert)
1572}
1573
1574// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
1575Buffer.prototype.copy = function copy (target, targetStart, start, end) {
1576  if (!start) start = 0
1577  if (!end && end !== 0) end = this.length
1578  if (targetStart >= target.length) targetStart = target.length
1579  if (!targetStart) targetStart = 0
1580  if (end > 0 && end < start) end = start
1581
1582  // Copy 0 bytes; we're done
1583  if (end === start) return 0
1584  if (target.length === 0 || this.length === 0) return 0
1585
1586  // Fatal error conditions
1587  if (targetStart < 0) {
1588    throw new RangeError('targetStart out of bounds')
1589  }
1590  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
1591  if (end < 0) throw new RangeError('sourceEnd out of bounds')
1592
1593  // Are we oob?
1594  if (end > this.length) end = this.length
1595  if (target.length - targetStart < end - start) {
1596    end = target.length - targetStart + start
1597  }
1598
1599  var len = end - start
1600  var i
1601
1602  if (this === target && start < targetStart && targetStart < end) {
1603    // descending copy from end
1604    for (i = len - 1; i >= 0; 

1604i--) {
1605      target[i + targetStart] = this[i + start]
1606    }
1607  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
1608    // ascending copy from start
1609    for (i = 0; i < len; i++) {
1610      target[i + targetStart] = this[i + start]
1611    }
1612  } else {
1613    Uint8Array.prototype.set.call(
1614      target,
1615      this.subarray(start, start + len),
1616      targetStart
1617    )
1618  }
1619
1620  return len
1621}
1622
1623// Usage:
1624//    buffer.fill(number[, offset[, end]])
1625//    buffer.fill(buffer[, offset[, end]])
1626//    buffer.fill(string[, offset[, end]][, encoding])
1627Buffer.prototype.fill = function fill (val, start, end, encoding) {
1628  // Handle string cases:
1629  if (typeof val === 'string') {
1630    if (typeof start === 'string') {
1631      encoding = start
1632      start = 0
1633      end = this.length
1634    } else if (typeof end === 'string') {
1635      encoding = end
1636      end = this.length
1637    }
1638    if (val.length === 1) {
1639      var code = val.charCodeAt(0)
1640      if (code < 256) {
1641        val = code
1642      }
1643    }
1644    if (encoding !== undefined && typeof encoding !== 'string') {
1645      throw new TypeError('encoding must be a string')
1646    }
1647    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
1648      throw new TypeError('Unknown encoding: ' + encoding)
1649    }
1650  } else if (typeof val === 'number') {
1651    val = val & 255
1652  }
1653
1654  // Invalid ranges are not set to a default, so can range check early.
1655  if (start < 0 || this.length < start || this.length < end) {
1656    throw new RangeError('Out of range index')
1657  }
1658
1659  if (end <= start) {
1660    return this
1661  }
1662
1663  start = start >>> 0
1664  end = end === undefined ? this.length : end >>> 0
1665
1666  if (!val) val = 0
1667
1668  var i
1669  if (typeof val === 'number') {
1670    for (i = start; i < end; i++) {
1671      this[i] = val
1672    }
1673  } else {
1674    var bytes = Buffer.isBuffer(val)
1675      ? val
1676      : utf8ToBytes(new Buffer(val, encoding).toString())
1677    var len = bytes.length
1678    for (i = 0; i < end - start; i++) {
1679      this[i + start] = bytes[i % len]
1680    }
1681  }
1682
1683  return this
1684}
1685
1686// HELPER FUNCTIONS
1687// ================
1688
1689var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
1690
1691function base64clean (str) {
1692  // Node strips out invalid characters like \n and \t from the string, base64-js does not
1693  str = stringtrim(str).replace(INVALID_BASE64_RE, '')
1694  // Node converts strings with length < 2 to ''
1695  if (str.length < 2) return ''
1696  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
1697  while (str.length % 4 !== 0) {
1698    str = str + '='
1699  }
1700  return str
1701}
1702
1703function stringtrim (str) {
1704  if (str.trim) return str.trim()
1705  return str.replace(/^\s+|\s+$/g, '')
1706}
1707
1708function toHex (n) {
1709  if (n < 16) return '0' + n.toString(16)
1710  return n.toString(16)
1711}
1712
1713function utf8ToBytes (string, units) {
1714  units = units || Infinity
1715  var codePoint
1716  var length = string.length
1717  var leadSurrogate = null
1718  var bytes = []
1719
1720  for (var i = 0; i < length; i++) {
1721    codePoint = string.charCodeAt(i)
1722
1723    // is surrogate component
1724    if (codePoint > 0xD7FF && codePoint < 0xE000) {
1725      // last char was a lead
1726      if (!leadSurrogate) {
1727        // no lead yet
1728        if (codePoint > 0xDBFF) {
1729          // unexpected trail
1730          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
1731          continue
1732        } else if (i + 1 === length) {
1733          // unpaired lead
1734          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
1735          continue
1736        }
1737
1738        // valid lead
1739        leadSurrogate = codePoint
1740
1741        continue
1742      }
1743
1744      // 2 leads in a row
1745      if (codePoint < 0xDC00) {
1746        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
1747        leadSurrogate = codePoint
1748        continue
1749      }
1750
1751      // valid surrogate pair
1752      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
1753    } else if (leadSurrogate) {
1754      // valid bmp char, but last char was a lead
1755      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
1756    }
1757
1758    leadSurrogate = null
1759
1760    // encode utf8
1761    if (codePoint < 0x80) {
1762      if ((units -= 1) < 0) break
1763      bytes.push(codePoint)
1764    } else if (codePoint < 0x800) {
1765      if ((units -= 2) < 0) break
1766      bytes.push(
1767        codePoint >> 0x6 | 0xC0,
1768        codePoint & 0x3F | 0x80
1769      )
1770    } else if (codePoint < 0x10000) {
1771      if ((units -= 3) < 0) break
1772      bytes.push(
1773        codePoint >> 0xC | 0xE0,
1774        codePoint >> 0x6 & 0x3F | 0x80,
1775        codePoint & 0x3F | 0x80
1776      )
1777    } else if (codePoint < 0x110000) {
1778      if ((units -= 4) < 0) break
1779      bytes.push(
1780        codePoint >> 0x12 | 0xF0,
1781        codePoint >> 0xC & 0x3F | 0x80,
1782        codePoint >> 0x6 & 0x3F | 0x80,
1783        codePoint & 0x3F | 0x80
1784      )
1785    } else {
1786      throw new Error('Invalid code point')
1787    }
1788  }
1789
1790  return bytes
1791}
1792
1793function asciiToBytes (str) {
1794  var byteArray = []
1795  for (var i = 0; i < str.length; i++) {
1796    // Node's code seems to be doing this and not & 0x7F..

2312      if (to.line - coverEnd.from.line < CHUNK_SIZE) {
2313        array.pop().clear();
2314        coverRange(cm, coverEnd.from, to);
2315      } else {
2316        coverRange(cm, coverEnd.to, to);
2317      }
2318    }
2319  }
2320});
2321
2322},{"../../lib/codemirror":10}],10:[function(require,module,exports){
2323// CodeMirror, copyright (c) by Marijn Haverbeke and others
2324// Distributed under an MIT license: http://codemirror.net/LICENSE
2325
2326// This is CodeMirror (http://codemirror.net), a code editor
2327// implemented in JavaScript on top of the browser's DOM.
2328//
2329// You can find some technical background for some of the code below
2330// at http://marijnhaverbeke.nl/blog/#cm-internals .
2331
2332(function(mod) {
2333  if (typeof exports == "object" && typeof module == "object") // CommonJS
2334    module.exports = mod();
2335  else if (typeof define == "function" && define.amd) // AMD
2336    return define([], mod);
2337  else // Plain browser env
2338    (this || window).CodeMirror = mod();
2339})(function() {
2340  "use strict";
2341
2342  // BROWSER SNIFFING
2343
2344  // Kludges for bugs and behavior differences that can't be feature
2345  // detected are enabled based on userAgent etc sniffing.
2346  var userAgent = navigator.userAgent;
2347  var platform = navigator.platform;
2348
2349  var gecko = /gecko\/\d/i.test(userAgent);
2350  var ie_upto10 = /MSIE \d/.test(userAgent);
2351  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
2352  var ie = ie_upto10 || ie_11up;
2353  var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : ie_11up[1]);
2354  var webkit = /WebKit\//.test(userAgent);
2355  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
2356  var chrome = /Chrome\//.test(userAgent);
2357  var presto = /Opera\//.test(userAgent);
2358  var safari = /Apple Computer/.test(navigator.vendor);
2359  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
2360  var phantom = /PhantomJS/.test(userAgent);
2361
2362  var ios = /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
2363  // This is woefully incomplete. Suggestions for alternative methods welcome.
2364  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
2365  var mac = ios || /Mac/.test(platform);
2366  var chromeOS = /\bCrOS\b/.test(userAgent);
2367  var windows = /win/i.test(platform);
2368
2369  var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
2370  if (presto_version) presto_version = Number(presto_version[1]);
2371  if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
2372  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
2373  var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
2374  var captureRightClick = gecko || (ie && ie_version >= 9);
2375
2376  // Optimize some code when these features are not used.
2377  var sawReadOnlySpans = false, sawCollapsedSpans = false;
2378
2379  // EDITOR CONSTRUCTOR
2380
2381  // A CodeMirror instance represents an editor. This is the object
2382  // that user code is usually dealing with.
2383
2384  function CodeMirror(place, options) {
2385    if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
2386
2387    this.options = options = options ? copyObj(options) : {};
2388    // Determine effective options based on given values and defaults.
2389    copyObj(defaults, options, false);
2390    setGuttersForLineNumbers(options);
2391
2392    var doc = options.value;
2393    if (typeof doc == "string") doc = new Doc(doc, options.mode, null, options.lineSeparator);
2394    this.doc = doc;
2395
2396    var input = new CodeMirror.inputStyles[options.inputStyle](this);
2397    var display = this.display = new Display(place, doc, input);
2398    display.wrapper.CodeMirror = this;
2399    updateGutters(this);
2400    themeChanged(this);
2401    if (options.lineWrapping)
2402      this.display.wrapper.className += " CodeMirror-wrap";
2403    if (options.autofocus && !mobile) display.input.focus();
2404    initScrollbars(this);
2405
2406    this.state = {
2407      keyMaps: [],  // stores maps added by addKeyMap
2408      overlays: [], // highlighting overlays, as added by addOverlay
2409      modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
2410      overwrite: false,
2411      delayingBlurEvent: false,
2412      focused: false,
2413      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
2414      pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
2415      selectingText: false,
2416      draggingText: false,
2417      highlight: new Delayed(), // stores highlight worker timeout
2418      keySeq: null,  // Unfinished key sequence
2419      specialChars: null
2420    };
2421
2422    var cm = this;
2423
2424    // Override magic textarea content restore that IE sometimes does
2425    // on our hidden textarea on reload
2426    if (ie && ie_version < 11) setTimeout(function() { cm.display.input.reset(true); }, 20);
2427
2428    registerEventHandlers(this);
2429    ensureGlobalHandlers();
2430
2431    startOperation(this);
2432    this.curOp.forceUpdate = true;
2433    attachDoc(this, doc);
2434
2435    if ((options.autofocus && !mobile) || cm.hasFocus())
2436      setTimeout(bind(onFocus, this), 20);
2437    else
2438      onBlur(this);
2439
2440    for (var opt in optionHandlers) if (optionHandlers.hasOwnProperty(opt))
2441      optionHandlers[opt](this, options[opt], Init);
2442    maybeUpdateLineNumberWidth(this);
2443    if (options.finishInit) options.finishInit(this);
2444    for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
2445    endOperation(this);
2446    // Suppress optimizelegibility in Webkit, since it breaks text
2447    // measuring on line wrapping boundaries.
2448    if (webkit && options.lineWrapping &&
2449        getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
2450      display.lineDiv.style.textRendering = "auto";
2451  }
2452
2453  // DISPLAY CONSTRUCTOR
2454
2455  // The display handles the DOM integration, both for input reading
2456  // and content drawing. It holds references to DOM nodes and
2457  // display-related state.
2458
2459  function Display(place, doc, input) {
2460    var d = this;
2461    this.input = input;
2462
2463    // Covers bottom-right square when both scrollbars are present.
2464    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
2465    d.scrollbarFiller.setAttribute("cm-not-content", "true");
2466    // Covers bottom of gutter when coverGutterNextToScrollbar is on
2467    // and h scrollbar is present.
2468    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
2469    d.gutterFiller.setAttribute("cm-not-content", "true");
2470    // Will contain the actual code, positioned to cover the viewport.
2471    d.lineDiv = elt("div", null, "CodeMirror-code");
2472    // Elements are added to these to represent selection and cursors.
2473    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
2474    d.cursorDiv = elt("div", null, "CodeMirror-cursors");
2475    // A visibility: hidden element used to find the size of things.
2476    d.measure = elt("div", null, "CodeMirror-measure");
2477    // When lines outside of the viewport are measured, they are drawn in this.
2478    d.lineMeasure = elt("div", null, "CodeMirror-measure");
2479    // Wraps everything that needs to exist inside the vertically-padded coordinate system
2480    d.lineSpace = elt("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
2481                      null, "position: relative; outline: none");
2482    // Moved around its parent to cover visible view.
2483    d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
2484    // Set to the height of the document, allowing scrolling.
2485    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
2486    d.sizerWidth = null;
2487    // Behavior of elts with overflow: auto and padding is
2488    // inconsistent across browsers. This is used to ensure the
2489    // scrollable area is big enough.
2490    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
2491    // Will contain the gutters, if any.
2492    d.gutters = elt("div", null, "CodeMirror-gutters");
2493    d.lineGutter = null;
2494    // Actual scrollable element.
2495    d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
2496    d.scroller.setAttribute("tabIndex", "-1");
2497    // The element in which the editor lives.
2498    d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
2499
2500    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
2501    if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
2502    if (!webkit && !(gecko && mobile)) d.scroller.draggable = true;
2503
2504    if (place) {
2505      if (place.appendChild) place.appendChild(d.wrapper);
2506      else place(d.wrapper);
2507    }
2508
2509    // Current rendered range (may be bigger than the view window).
2510    d.viewFrom = d.viewTo = doc.first;
2511    d.reportedViewFrom = d.reportedViewTo = doc.first;
2512    // Information about the rendered lines.
2513    d.view = [];
2514    d.renderedView = null;
2515    // Holds info about a single rendered line when it was rendered
2516    // for measurement, while not in view.
2517    d.externalMeasured = null;
2518    // Empty space (in pixels) above the view
2519    d.viewOffset = 0;
2520    d.lastWrapHeight = d.lastWrapWidth = 0;
2521    d.updateLineNumbers = null;
2522
2523    d.nativeBarWidth = d.barHeight = d.barWidth = 0;
2524    d.scrollbarsClipped = false;
2525
2526    // Used to only resize the line number gutter when necessary (when
2527    // the amount of lines crosses a boundary that makes its width change)
2528    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
2529    // Set to true when a non-horizontal-scrolling line widget is
2530    // added. As an optimization, line widget aligning is skipped when
2531    // this is false.
2532    d.alignWidgets = false;
2533
2534    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
2535
2536    // Tracks the maximum line length so that the horizontal scrollbar
2537    // can be kept static when scrolling.
2538    d.maxLine = null;
2539    d.maxLineLength = 0;
2540    d.maxLineChanged = false;
2541
2542    // Used for measuring wheel scrolling granularity
2543    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
2544
2545    // True when shift is held down.
2546    d.shift = false;
2547
2548    // Used to track whether anything happened since the context menu
2549    // was opened.
2550    d.selForContextMenu = null;
2551
2552    d.activeTouch = null;
2553
2554    input.init(d);
2555  }
2556
2557  // STATE UPDATES
2558
2559  // Used to get the editor into a consistent state again when options change.
2560
2561  function loadMode(cm) {
2562    cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
2563    resetModeState(cm);
2564  }
2565
2566  function resetModeState(cm) {
2567    cm.doc.iter(function(line) {
2568      if (line.stateAfter) line.stateAfter = null;
2569      if (line.styles) line.styles = null;
2570    });
2571    cm.doc.frontier = cm.doc.first;
2572    startWorker(cm, 100);
2573    cm.state.modeGen++;
2574    if (cm.curOp) regChange(cm);
2575  }
2576
2577  function wrappingChanged(cm) {
2578    if (cm.options.lineWrapping) {
2579      addClass(cm.display.wrapper, "CodeMirror-wrap");
2580      cm.display.sizer.style.minWidth = "";
2581      cm.display.sizerWidth = null;
2582    } else {
2583      rmClass(cm.display.wrapper, "CodeMirror-wrap");
2584      findMaxLine(cm);
2585    }
2586    estimateLineHeights(cm);
2587    regChange(cm);
2588    clearCaches(cm);
2589    setTimeout(function(){updateScrollbars(cm);}, 100);
2590  }
2591
2592  // Returns a function that estimates the height of a line, to use as
2593  // first approximation until the line becomes visible (and is thus
2594  // properly measurable).
2595  function estimateHeight(cm) {
2596    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
2597    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
2598    return function(line) {
2599      if (lineIsHidden(cm.doc, line)) return 0;
2600
2601      var widgetsHeight = 0;
2602      if (line.widgets) for (var i = 0; i < line.widgets.length; i++) {
2603        if (line.widgets[i].height) widgetsHeight += line.widgets[i].height;
2604      }
2605
2606      if (wrapping)
2607        return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th;
2608      else
2609        return widgetsHeight + th;
2610    };
2611  }
2612
2613  function estimateLineHeights(cm) {
2614    var doc = cm.doc, est = estimateHeight(cm);
2615    doc.iter(function(line) {
2616      var estHeight = est(line);
2617      if (estHeight != line.height) updateLineHeight(line, estHeight);
2618    });
2619  }
2620
2621  function themeChanged(cm) {
2622    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
2623      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
2624    clearCaches(cm);
2625  }
2626
2627  function guttersChanged(cm) {
2628    updateGutters(cm);
2629    regChange(cm);
2630    setTimeout(function(){alignHorizontally(cm);}, 20);
2631  }
2632
2633  // Rebuild the gutter elements, ensure the margin to the left of the
2634  // code matches their width.
2635  function updateGutters(cm) {
2636    var gutters = cm.display.gutters, specs = cm.options.gutters;
2637    removeChildren(gutters);
2638    for (var i = 0; i < specs.length; ++i) {
2639      var gutterClass = specs[i];
2640      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
2641      if (gutterClass == "CodeMirror-linenumbers") {
2642        cm.display.lineGutter = gElt;
2643        gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
2644      }
2645    }
2646    gutters.style.display = i ? "" : "none";
2647    updateGutterSpace(cm);
2648  }
2649
2650  function updateGutterSpace(cm) {
2651    var width = cm.display.gutters.offsetWidth;
2652    cm.display.sizer.style.marginLeft = width + "px";
2653  }
2654
2655  // Compute the character length of a line, taking into account
2656  // collapsed ranges (see markText) that might hide parts, and join
2657  // other lines onto it.
2658  function lineLength(line) {
2659    if (line.height == 0) return 0;
2660    var len = line.text.length, merged, cur = line;
2661    while (merged = collapsedSpanAtStart(cur)) {
2662      var found = merged.find(0, true);
2663      cur = found.from.line;
2664      len += found.from.ch - found.to.ch;
2665    }
2666    cur = line;
2667    while (merged = collapsedSpanAtEnd(cur)) {
2668      var found = merged.find(0, true);
2669      len -= cur.text.length - found.from.ch;
2670      cur = found.to.line;
2671      len += cur.text.length - found.to.ch;
2672    }
2673    return len;
2674  }
2675
2676  // Find the longest line in the document.
2677  function findMaxLine(cm) {
2678    var d = cm.display, doc = cm.doc;
2679    d.maxLine = getLine(doc, doc.first);
2680    d.maxLineLength = lineLength(d.maxLine);
2681    d.maxLineChanged = true;
2682    doc.iter(function(line) {
2683      var len = lineLength(line);
2684      if (len > d.maxLineLength) {
2685        d.maxLineLength = len;
2686        d.maxLine = line;
2687      }
2688    });
2689  }
2690
2691  // Make sure the gutters options contains the element
2692  // "CodeMirror-linenumbers" when the lineNumbers option is true.
2693  function setGuttersForLineNumbers(options) {
2694    var found = indexOf(options.gutters, "CodeMirror-linenumbers");
2695    if (found == -1 && options.lineNumbers) {
2696      options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
2697    } else if (found > -1 && !options.lineNumbers) {
2698      options.gutters = options.gutters.slice(0);
2699      options.gutters.splice(found, 1);
2700    }
2701  }
2702
2703  // SCROLLBARS
2704
2705  // Prepare DOM reads needed to update the scrollbars. Done in one
2706  // shot to minimize update/measure roundtrips.
2707  function measureForScrollbars(cm) {
2708    var d = cm.display, gutterW = d.gutters.offsetWidth;
2709    var docH = Math.round(cm.doc.height + paddingVert(cm.display));
2710    return {
2711      clientHeight: d.scroller.clientHeight,
2712      viewHeight: d.wrapper.clientHeight,
2713      scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
2714      viewWidth: d.wrapper.clientWidth,
2715      barLeft: cm.options.fixedGutter ? gutterW : 0,
2716      docHeight: docH,
2717      scrollHeight: docH + scrollGap(cm) + d.barHeight,
2718      nativeBarWidth: d.nativeBarWidth,
2719      gutterWidth: gutterW
2720    };
2721  }
2722
2723  function NativeScrollbars(place, scroll, cm) {
2724    this.cm = cm;
2725    var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
2726    var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
2727    place(vert); place(horiz);
2728
2729    on(vert, "scroll", function() {
2730      if (vert.clientHeight) scroll(vert.scrollTop, "vertical");
2731    });
2732    on(horiz, "scroll", function() {
2733      if (horiz.clientWidth) scroll(horiz.scrollLeft, "horizontal");
2734    });
2735
2736    this.checkedZeroWidth = false;
2737    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
2738    if (ie && ie_version < 8) this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
2739  }
2740
2741  NativeScrollbars.prototype = copyObj({
2742    update: function(measure) {
2743      var needsH = measure.scrollWidth > measure.clientWidth + 1;
2744      var needsV = measure.scrollHeight > measure.clientHeight + 1;
2745      var sWidth = measure.nativeBarWidth;
2746
2747      if (needsV) {
2748        this.vert.style.display = "block";
2749        this.vert.style.bottom = needsH ? sWidth + "px" : "0";
2750        var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
2751        // A bug in IE8 can cause this value to be negative, so guard it.
2752        this.vert.firstChild.style.height =
2753          Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
2754      } else {
2755        this.vert.style.display = "";
2756        this.vert.firstChild.style.height = "0";
2757      }
2758
2759      if (needsH) {
2760        this.horiz.style.display = "block";
2761        this.horiz.style.right = needsV ? sWidth + "px" : "0";
2762        this.horiz.style.left = measure.barLeft + "px";
2763        var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
2764        this.horiz.firstChild.style.width =
2765          (measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
2766      } else {
2767        this.horiz.style.display = "";
2768        this.horiz.firstChild.style.width = "0";
2769      }
2770
2771      if (!this.checkedZeroWidth && measure.clientHeight > 0) {
2772        if (sWidth == 0) this.zeroWidthHack();
2773        this.checkedZeroWidth = true;
2774      }
2775
2776      return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0};
2777    },
2778    setScrollLeft: function(pos) {
2779      if (this.horiz.scrollLeft != pos) this.horiz.scrollLeft = pos;
2780      if (this.disableHoriz) this.enableZeroWidthBar(this.horiz, this.disableHoriz);
2781    },
2782    setScrollTop: function(pos) {
2783      if (this.vert.scrollTop != pos) this.vert.scrollTop = pos;
2784      if (this.disableVert) this.enableZeroWidthBar(this.vert, this.disableVert);
2785    },
2786    zeroWidthHack: function() {
2787      var w = mac && !mac_geMountainLion ? "12px" : "18px";
2788      this.horiz.style.height = this.vert.style.width = w;
2789      this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
2790      this.disableHoriz = new Delayed;
2791      this.disableVert = new Delayed;
2792    },
2793    enableZeroWidthBar: function(bar, delay) {
2794      bar.style.pointerEvents = "auto";
2795      function maybeDisable() {
2796        // To find out whether the scrollbar is still visible, we
2797        // check whether the element under the pixel in the bottom
2798        // left corner of the scrollbar box is the scrollbar box
2799        // itself (when the bar is still visible) or its filler child
2800        // (when the bar is hidden). If it is still visible, we keep
2801        // it enabled, if it's hidden, we disable pointer events.
2802        var box = bar.getBoundingClientRect();
2803        var elt = document.elementFromPoint(box.left + 1, box.bottom - 1);
2804        if (elt != bar) bar.style.pointerEvents = "none";
2805        else delay.set(1000, maybeDisable);
2806      }
2807      delay.set(1000, maybeDisable);
2808    },
2809    clear: function() {
2810      var parent = this.horiz.parentNode;
2811      parent.removeChild(this.horiz);
2812      parent.removeChild(this.vert);
2813    }
2814  }, NativeScrollbars.prototype);
2815
2816  function NullScrollbars() {}
2817
2818  NullScrollbars.prototype = copyObj({
2819    update: function() { return {bottom: 0, right: 0}; },
2820    setScrollLeft: function() {},
2821    setScrollTop: function() {},
2822    clear: function() {}
2823  }, NullScrollbars.prototype);
2824
2825  CodeMirror.scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};
2826
2827  function initScrollbars(cm) {
2828    if (cm.display.scrollbars) {
2829      cm.display.scrollbars.clear();
2830      if (cm.display.scrollbars.addClass)
2831        rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
2832    }
2833
2834    cm.display.scrollbars = new CodeMirror.scrollbarModel[cm.options.scrollbarStyle](function(node) {
2835      cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
2836      // Prevent clicks in the scrollbars from killing focus
2837      on(node, "mousedown", function() {
2838        if (cm.state.focused) setTimeout(function() { cm.display.input.focus(); }, 0);
2839      });
2840      node.setAttribute("cm-not-content", "true");
2841    }, function(pos, axis) {
2842      if (axis == "horizontal") setScrollLeft(cm, pos);
2843      else setScrollTop(cm, pos);
2844    }, cm);
2845    if (cm.display.scrollbars.addClass)
2846      addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
2847  }
2848
2849  function updateScrollbars(cm, measure) {
2850    if (!measure) measure = measureForScrollbars(cm);
2851    var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
2852    updateScrollbarsInner(cm, measure);
2853    for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
2854      if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
2855        updateHeightsInViewport(cm);
2856      updateScrollbarsInner(cm, measureForScrollbars(cm));
2857      startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
2858    }
2859  }
2860
2861  // Re-synchronize the fake scrollbars with the actual size of the
2862  // content.
2863  function updateScrollbarsInner(cm, measure) {
2864    var d = cm.display;
2865    var sizes = d.scrollbars.update(measure);
2866
2867    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
2868    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
2869    d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent"
2870
2871    if (sizes.right && sizes.bottom) {
2872      d.scrollbarFiller.style.display = "block";
2873      d.scrollbarFiller.style.height = sizes.bottom + "px";
2874      d.scrollbarFiller.style.width = sizes.right + "px";
2875    } else d.scrollbarFiller.style.display = "";
2876    if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
2877      d.gutterFiller.style.display = "block";
2878      d.gutterFiller.style.height = sizes.bottom + "px";
2879      d.gutterFiller.style.width = measure.gutterWidth + "px";
2880    } else d.gutterFiller.style.display = "";
2881  }
2882
2883  // Compute the lines that are visible in a given viewport (defaults
2884  // the the current scroll position). viewport may contain top,
2885  // height, and ensure (see op.scrollToPos) properties.
2886  function visibleLines(display, doc, viewport) {
2887    var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
2888    top = Math.floor(top - paddingTop(display));
2889    var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;
2890
2891    var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
2892    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
2893    // forces those lines into the viewport (if possible).
2894    if (viewport && viewport.ensure) {
2895      var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
2896      if (ensureFrom < from) {
2897        from = ensureFrom;
2898        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
2899      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
2900        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
2901        to = ensureTo;
2902      }
2903    }
2904    return {from: from, to: Math.max(to, from + 1)};
2905  }
2906
2907  // LINE NUMBERS
2908
2909  // Re-align line numbers and gutter marks to compensate for
2910  // horizontal scrolling.
2911  function alignHorizontally(cm) {
2912    var display = cm.display, view = display.view;
2913    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;
2914    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
2915    var gutterW = display.gutters.offsetWidth, left = comp + "px";
2916    for (var i = 0; i < view.length; i++) if (!view[i].hidden) {
2917      if (cm.options.fixedGutter && view[i].gutter)
2918        view[i].gutter.style.left = left;
2919      var align = view[i].alignable;
2920      if (align) for (var j = 0; j < align.length; j++)
2921        align[j].style.left = left;
2922    }
2923    if (cm.options.fixedGutter)
2924      display.gutters.style.left = (comp + gutterW) + "px";
2925  }
2926
2927  // Used to ensure that the line number gutter is still the right
2928  // size for the current document size. Returns true when an update
2929  // is needed.
2930  function maybeUpdateLineNumberWidth(cm) {
2931    if (!cm.options.lineNumbers) return false;
2932    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
2933    if (last.length != display.lineNumChars) {
2934      var test = display.measure.appendChild(elt("div", [elt("div", last)],
2935                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));
2936      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
2937      display.lineGutter.style.width = "";
2938      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
2939      display.lineNumWidth = display.lineNumInnerWidth + padding;
2940      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
2941      display.lineGutter.style.width = display.lineNumWidth + "px";
2942      updateGutterSpace(cm);
2943      return true;
2944    }
2945    return false;
2946  }
2947
2948  function lineNumberFor(options, i) {
2949    return String(options.lineNumberFormatter(i + options.firstLineNumber));
2950  }
2951
2952  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
2953  // but using getBoundingClientRect to get a sub-pixel-accurate
2954  // result.
2955  function compensateForHScroll(display) {
2956    return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left;
2957  }
2958
2959  // DISPLAY DRAWING
2960
2961  function DisplayUpdate(cm, viewport, force) {
2962    var display = cm.display;
2963
2964    this.viewport = viewport;
2965    // Store some values that we'll need later (but don't want to force a relayout for)
2966    this.visible = visibleLines(display, cm.doc, viewport);
2967    this.editorIsHidden = !display.wrapper.offsetWidth;
2968    this.wrapperHeight = display.wrapper.clientHeight;
2969    this.wrapperWidth = display.wrapper.clientWidth;
2970    this.oldDisplayWidth = displayWidth(cm);
2971    this.force = force;
2972    this.dims = getDimensions(cm);
2973    this.events = [];
2974  }
2975
2976  DisplayUpdate.prototype.signal = function(emitter, type) {
2977    if (hasHandler(emitter, type))
2978      this.events.push(arguments);
2979  };
2980  DisplayUpdate.prototype.finish = function() {
2981    for (var i = 0; i < this.events.length; i++)
2982      signal.apply(null, this.events[i]);
2983  };
2984
2985  function maybeClipScrollbars(cm) {
2986    var display = cm.display;
2987    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
2988      display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
2989      display.heightForcer.style.height = scrollGap(cm) + "px";
2990      display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
2991      display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
2992      display.scrollbarsClipped = true;
2993    }
2994  }
2995
2996  // Does the actual updating of the line display. Bails out
2997  // (returning false) when there is nothing to be done and forced is
2998  // false.
2999  function updateDisplayIfNeeded(cm, update) {
3000    var display = cm.display, doc = cm.doc;
3001
3002    if (update.editorIsHidden) {
3003      resetView(cm);
3004      return false;
3005    }
3006
3007    // Bail out if the visible area is already rendered and nothing changed.
3008    if (!update.force &&
3009        update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
3010        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
3011        display.renderedView == display.view && countDirtyView(cm) == 0)
3012      return false;
3013
3014    if (maybeUpdateLineNumberWidth(cm)) {
3015      resetView(cm);
3016      update.dims = getDimensions(cm);
3017    }
3018
3019    // Compute a suitable new viewport (from & to)
3020    var end = doc.first + doc.size;
3021    var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
3022    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
3023    if (display.viewFrom < from && from - display.viewFrom < 20) from = Math.max(doc.first, display.viewFrom);
3024    if (display.viewTo > to && display.viewTo - to < 20) to = Math.min(end, display.viewTo);
3025    if (sawCollapsedSpans) {
3026      from = visualLineNo(cm.doc, from);
3027      to = visualLineEndNo(cm.doc, to);
3028    }
3029
3030    var different = from != display.viewFrom || to != display.viewTo ||
3031      display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
3032    adjustView(cm, from, to);
3033
3034    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
3035    // Position the mover div to align with the current scroll position
3036    cm.display.mover.style.top = display.viewOffset + "px";
3037
3038    var toUpdate = countDirtyView(cm);
3039    if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
3040        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
3041      return false;
3042
3043    // For big changes, we hide the enclosing element during the
3044    // update, since that speeds up the operations on most browsers.
3045    var focused = activeElt();
3046    if (toUpdate > 4) display.lineDiv.style.display = "none";
3047    patchDisplay(cm, display.updateLineNumbers, update.dims);
3048    if (toUpdate > 4) display.lineDiv.style.display = "";
3049    display.renderedView = display.view;
3050    // There might have been a widget with a focused element that got
3051    // hidden or updated, if so re-focus it.
3052    if (focused && activeElt() != focused && focused.offsetHeight) focused.focus();
3053
3054    // Prevent selection and cursors from interfering with the scroll
3055    // width and height.
3056    removeChildren(display.cursorDiv);
3057    removeChildren(display.selectionDiv);
3058    display.gutters.style.height = display.sizer.style.minHeight = 0;
3059
3060    if (different) {
3061      display.lastWrapHeight = update.wrapperHeight;
3062      display.lastWrapWidth = update.wrapperWidth;
3063      startWorker(cm, 400);
3064    }
3065
3066    display.updateLineNumbers = null;
3067
3068    return true;
3069  }
3070
3071  function postUpdateDisplay(cm, update) {
3072    var viewport = update.viewport;
3073
3074    for (var first = true;; first = false) {
3075      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
3076        // Clip forced viewport to actual scrollable area.
3077        if (viewport && viewport.top != null)
3078          viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)};
3079        // Updated line heights might result in the drawn area not
3080        // actually covering the viewport. Keep looping until it does.
3081        update.visible = visibleLines(cm.display, cm.doc, viewport);
3082        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
3083          break;
3084      }
3085      if (!updateDisplayIfNeeded(cm, update)) break;
3086      updateHeightsInViewport(cm);
3087      var barMeasure = measureForScrollbars(cm);
3088      updateSelection(cm);
3089      updateScrollbars(cm, barMeasure);
3090      setDocumentHeight(cm, barMeasure);
3091    }
3092
3093    update.signal(cm, "update", cm);
3094    if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
3095      update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
3096      cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
3097    }
3098  }
3099
3100  function updateDisplaySimple(cm, viewport) {
3101    var update = new DisplayUpdate(cm, viewport);
3102    if (updateDisplayIfNeeded(cm, update)) {
3103      updateHeightsInViewport(cm);
3104      postUpdateDisplay(cm, update);
3105      var barMeasure = measureForScrollbars(cm);
3106      updateSelection(cm);
3107      updateScrollbars(cm, barMeasure);
3108      setDocumentHeight(cm, barMeasure);
3109      update.finish();
3110    }
3111  }
3112
3113  function setDocumentHeight(cm, measure) {
3114    cm.display.sizer.style.minHeight = measure.docHeight + "px";
3115    cm.display.heightForcer.style.top = measure.docHeight + "px";
3116    cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
3117  }
3118
3119  // Read the actual heights of the rendered lines, and update their
3120  // stored heights to match.
3121  function updateHeightsInViewport(cm) {
3122    var display = cm.display;
3123    var prevBottom = display.lineDiv.offsetTop;
3124    for (var i = 0; i < display.view.length; i++) {
3125      var cur = display.view[i], height;
3126      if (cur.hidden) continue;
3127      if (ie && ie_version < 8) {
3128        var bot = cur.node.offsetTop + cur.node.offsetHeight;
3129        height = bot - prevBottom;
3130        prevBottom = bot;
3131      } else {
3132        var box = cur.node.getBoundingClientRect();
3133        height = box.bottom - box.top;
3134      }
3135      var diff = cur.line.height - height;
3136      if (height < 2) height = textHeight(display);
3137      if (diff > .001 || diff < -.001) {
3138        updateLineHeight(cur.line, height);
3139        updateWidgetHeight(cur.line);
3140        if (cur.rest) for (var j = 0; j < cur.rest.length; j++)
3141          updateWidgetHeight(cur.rest[j]);
3142      }
3143    }
3144  }
3145
3146  // Read and store the height of line widgets associated with the
3147  // given line.
3148  function updateWidgetHeight(line) {
3149    if (line.widgets) for (var i = 0; i < line.widgets.length; ++i)
3150      line.widgets[i].height = line.widgets[i].node.parentNode.offsetHeight;
3151  }
3152
3153  // Do a bulk-read of the DOM positions and sizes needed to draw the
3154  // view, so that we don't interleave reading and writing to the DOM.
3155  function getDimensions(cm) {
3156    var d = cm.display, left = {}, width = {};
3157    var gutterLeft = d.gutters.clientLeft;
3158    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
3159      left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
3160      width[cm.options.gutters[i]] = n.clientWidth;
3161    }
3162    return {fixedPos: compensateForHScroll(d),
3163            gutterTotalWidth: d.gutters.offsetWidth,
3164            gutterLeft: left,
3165            gutterWidth: width,
3166            wrapperWidth: d.wrapper.clientWidth};
3167  }
3168
3169  // Sync the actual display DOM structure with display.view, removing
3170  // nodes for lines that are no longer in view, and creating the ones
3171  // that are not there yet, and updating the ones that are out of
3172  // date.
3173  function patchDisplay(cm, updateNumbersFrom, dims) {
3174    var display = cm.display, lineNumbers = cm.options.lineNumbers;
3175    var container = display.lineDiv, cur = container.firstChild;
3176
3177    function rm(node) {
3178      var next = node.nextSibling;
3179      // Works around a throw-scroll bug in OS X Webkit
3180      if (webkit && mac && cm.display.currentWheelTarget == node)
3181        node.style.display = "none";
3182      else
3183        node.parentNode.removeChild(node);
3184      return next;
3185    }
3186
3187    var view = display.view, lineN = display.viewFrom;
3188    // Loop over the elements in the view, syncing cur (the DOM nodes
3189    // in display.lineDiv) with the view as we go.
3190    for (var i = 0; i < view.length; i++) {
3191      var lineView = view[i];
3192      if (lineView.hidden) {
3193      } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
3194        var node = buildLineElement(cm, lineView, lineN, dims);
3195        container.insertBefore(node, cur);
3196      } else { // Already drawn
3197        while (cur != lineView.node) cur = rm(cur);
3198        var updateNumber = lineNumbers && updateNumbersFrom != null &&
3199          updateNumbersFrom <= lineN && lineView.lineNumber;
3200        if (lineView.changes) {
3201          if (indexOf(lineView.changes, "gutter") > -1) updateNumber = false;
3202          updateLineForChanges(cm, lineView, lineN, dims);
3203        }
3204        if (updateNumber) {
3205          removeChildren(lineView.lineNumber);
3206          lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
3207        }
3208        cur = lineView.node.nextSibling;
3209      }
3210      lineN += lineView.size;
3211    }
3212    while (cur) cur = rm(cur);
3213  }
3214
3215  // When an aspect of a line changes, a string is added to
3216  // lineView.changes. This updates the relevant part of the line's
3217  // DOM structure.
3218  function updateLineForChanges(cm, lineView, lineN, dims) {
3219    for (var j = 0; j < lineView.changes.length; j++) {
3220      var type = lineView.changes[j];
3221      if (type == "text") updateLineText(cm, lineView);
3222      else if (type == "gutter") updateLineGutter(cm, lineView, lineN, dims);
3223      else if (type == "class") updateLineClasses(lineView);
3224      else if (type == "widget") updateLineWidgets(cm, lineView, dims);
3225    }
3226    lineView.changes = null;
3227  }
3228
3229  // Lines with gutter elements, widgets or a background class need to
3230  // be wrapped, and have the extra elements added to the wrapper div
3231  function ensureLineWrapped(lineView) {
3232    if (lineView.node == lineView.text) {
3233      lineView.node = elt("div", null, null, "position: relative");
3234      if (lineView.text.parentNode)
3235        lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
3236      lineView.node.appendChild(lineView.text);
3237      if (ie && ie_version < 8) lineView.node.style.zIndex = 2;
3238    }
3239    return lineView.node;
3240  }
3241
3242  function updateLineBackground(lineView) {
3243    var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
3244    if (cls) cls += " CodeMirror-linebackground";
3245    if (lineView.background) {
3246      if (cls) lineView.background.className = cls;
3247      else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
3248    } else if (cls) {
3249      var wrap = ensureLineWrapped(lineView);
3250      lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
3251    }
3252  }
3253
3254  // Wrapper around buildLineContent which will reuse the structure
3255  // in display.externalMeasured when possible.
3256  function getLineContent(cm, lineView) {
3257    var ext = cm.display.externalMeasured;
3258    if (ext && ext.line == lineView.line) {
3259      cm.display.externalMeasured = null;
3260      lineView.measure = ext.measure;
3261      return ext.built;
3262    }
3263    return buildLineContent(cm, lineView);
3264  }
3265
3266  // Redraw the line's text. Interacts with the background and text
3267  // classes because the mode may output tokens that influence these
3268  // classes.
3269  function updateLineText(cm, lineView) {
3270    var cls = lineView.text.className;
3271    var built = getLineContent(cm, lineView);
3272    if (lineView.text == lineView.node) lineView.node = built.pre;
3273    lineView.text.parentNode.replaceChild(built.pre, lineView.text);
3274    lineView.text = built.pre;
3275    if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
3276      lineView.bgClass = built.bgClass;
3277      lineView.textClass = built.textClass;
3278      updateLineClasses(lineView);
3279    } else if (cls) {
3280      lineView.text.className = cls;
3281    }
3282  }
3283
3284  function updateLineClasses(lineView) {
3285    updateLineBackground(lineView);
3286    if (lineView.line.wrapClass)
3287      ensureLineWrapped(lineView).className = lineView.line.wrapClass;
3288    else if (lineView.node != lineView.text)
3289      lineView.node.className = "";
3290    var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
3291    lineView.text.className = textClass || "";
3292  }
3293
3294  function updateLineGutter(cm, lineView, lineN, dims) {
3295    if (lineView.gutter) {
3296      lineView.node.removeChild(lineView.gutter);
3297      lineView.gutter = null;
3298    }
3299    if (lineView.gutterBackground) {
3300      lineView.node.removeChild(lineView.gutterBackground);
3301      lineView.gutterBackground = null;
3302    }
3303    if (lineView.line.gutterClass) {
3304      var wrap = ensureLineWrapped(lineView);
3305      lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
3306                                      "left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
3307                                      "px; width: " + dims.gutterTotalWidth + "px");
3308      wrap.insertBefore(lineView.gutterBackground, lineView.text);
3309    }
3310    var markers = lineView.line.gutterMarkers;
3311    if (cm.options.lineNumbers || markers) {
3312      var wrap = ensureLineWrapped(lineView);
3313      var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", "left: " +
3314                                             (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px");
3315      cm.display.input.setUneditable(gutterWrap);
3316      wrap.insertBefore(gutterWrap, lineView.text);
3317      if (lineView.line.gutterClass)
3318        gutterWrap.className += " " + lineView.line.gutterClass;
3319      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
3320        lineView.lineNumber = gutterWrap.appendChild(
3321          elt("div", lineNumberFor(cm.options, lineN),
3322              "CodeMirror-linenumber CodeMirror-gutter-elt",
3323              "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
3324              + cm.display.lineNumInnerWidth + "px"));
3325      if (markers) for (var k = 0; k < cm.options.gutters.length; ++k) {
3326        var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
3327        if (found)
3328          gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
3329                                     dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
3330      }
3331    }
3332  }
3333
3334  function updateLineWidgets(cm, lineView, dims) {
3335    if (lineView.alignable) lineView.alignable = null;
3336    for (var node = lineView.node.firstChild, next; node; node = next) {
3337      var next = node.nextSibling;
3338      if (node.className == "CodeMirror-linewidget")
3339        lineView.node.removeChild(node);
3340    }
3341    insertLineWidgets(cm, lineView, dims);
3342  }
3343
3344  // Build a line's DOM representation from scratch
3345  function buildLineElement(cm, lineView, lineN, dims) {
3346    var built = getLineContent(cm, lineView);
3347    lineView.text = lineView.node = built.pre;
3348    if (built.bgClass) lineView.bgClass = built.bgClass;
3349    if (built.textClass) lineView.textClass = built.textClass;
3350
3351    updateLineClasses(lineView);
3352    updateLineGutter(cm, lineView, lineN, dims);
3353    insertLineWidgets(cm, lineView, dims);
3354    return lineView.node;
3355  }
3356
3357  // A lineView may contain multiple logical lines (when merged by
3358  // collapsed spans). The widgets for all of them need to be drawn.
3359  function insertLineWidgets(cm, lineView, dims) {
3360    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
3361    if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
3362      insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
3363  }
3364
3365  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
3366    if (!line.widgets) return;
3367    var wrap = ensureLineWrapped(lineView);
3368    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
3369      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
3370      if (!widget.handleMouseEvents) node.setAttribute("cm-ignore-events", "true");
3371      positionLineWidget(widget, node, lineView, dims);
3372      cm.display.input.setUneditable(node);
3373      if (allowAbove && widget.above)
3374        wrap.insertBefore(node, lineView.gutter || lineView.text);
3375      else
3376        wrap.appendChild(node);
3377      signalLater(widget, "redraw");
3378    }
3379  }
3380
3381  function positionLineWidget(widget, node, lineView, dims) {
3382    if (widget.noHScroll) {
3383      (lineView.alignable || (lineView.alignable = [])).push(node);
3384      var width = dims.wrapperWidth;
3385      node.style.left = dims.fixedPos + "px";
3386      if (!widget.coverGutter) {
3387        width -= dims.gutterTotalWidth;
3388        node.style.paddingLeft = dims.gutterTotalWidth + "px";
3389      }
3390      node.style.width = width + "px";
3391    }
3392    if (widget.coverGutter) {
3393      node.style.zIndex = 5;
3394      node.style.position = "relative";
3395      if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";
3396    }
3397  }
3398
3399  // POSITION OBJECT
3400
3401  // A Pos instance represents a position within the text.
3402  var Pos = CodeMirror.Pos = function(line, ch) {
3403    if (!(this instanceof Pos)) return new Pos(line, ch);
3404    this.line = line; this.ch = ch;
3405  };
3406
3407  // Compare two positions, return 0 if they are the same, a negative
3408  // number when a is less, and a positive number otherwise.
3409  var cmp = CodeMirror.cmpPos = function(a, b) { return a.line - b.line || a.ch - b.ch; };
3410
3411  function copyPos(x) {return Pos(x.line, x.ch);}
3412  function maxPos(a, b) { return cmp(a, b) < 0 ? b : a; }
3413  function minPos(a, b) { return cmp(a, b) < 0 ? a : b; }
3414
3415  // INPUT HANDLING
3416
3417  function ensureFocus(cm) {
3418    if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }
3419  }
3420
3421  // This will be set to a {lineWise: bool, text: [string]} object, so
3422  // that, when pasting, we know what kind of selections the copied
3423  // text was made out of.
3424  var lastCopied = null;
3425
3426  function applyTextInput(cm, inserted, deleted, sel, origin) {
3427    var doc = cm.doc;
3428    cm.display.shift = false;
3429    if (!sel) sel = doc.sel;
3430
3431    var paste = cm.state.pasteIncoming || origin == "paste";
3432    var textLines = doc.splitLines(inserted), multiPaste = null
3433    // When pasing N lines into N selections, insert one line per selection
3434    if (paste && sel.ranges.length > 1) {
3435      if (lastCopied && lastCopied.text.join("\n") == inserted) {
3436        if (sel.ranges.length % lastCopied.text.length == 0) {
3437          multiPaste = [];
3438          for (var i = 0; i < lastCopied.text.length; i++)
3439            multiPaste.push(doc.splitLines(lastCopied.text[i]));
3440        }
3441      } else if (textLines.length == sel.ranges.length) {
3442        multiPaste = map(textLines, function(l) { return [l]; });
3443      }
3444    }
3445
3446    // Normal behavior is to insert the new text into every selection
3447    for (var i = sel.ranges.length - 1; i >= 0; i--) {
3448      var range = sel.ranges[i];
3449      var from = range.from(), to = range.to();
3450      if (range.empty()) {
3451        if (deleted && deleted > 0) // Handle deletion
3452          from = Pos(from.line, from.ch - deleted);
3453        else if (cm.state.overwrite && !paste) // Handle overwrite
3454          to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
3455        else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
3456          from = to = Pos(from.line, 0)
3457      }
3458      var updateInput = cm.curOp.updateInput;
3459      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i % multiPaste.length] : textLines,
3460                         origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")};
3461      makeChange(cm.doc, changeEvent);
3462      signalLater(cm, "inputRead", cm, changeEvent);
3463    }
3464    if (inserted && !paste)
3465      triggerElectric(cm, inserted);
3466
3467    ensureCursorVisible(cm);
3468    cm.curOp.updateInput = updateInput;
3469    cm.curOp.typing = true;
3470    cm.state.pasteIncoming = cm.state.cutIncoming = false;
3471  }
3472
3473  function handlePaste(e, cm) {
3474    var pasted = e.clipboardData && e.clipboardData.getData("text/plain");
3475    if (pasted) {
3476      e.preventDefault();
3477      if (!cm.isReadOnly() && !cm.options.disableInput)
3478        runInOp(cm, function() { applyTextInput(cm, pasted, 0, null, "paste"); });
3479      return true;
3480    }
3481  }
3482
3483  function triggerElectric(cm, inserted) {
3484    // When an 'electric' character is inserted, immediately trigger a reindent
3485    if (!cm.options.electricChars || !cm.options.smartIndent) return;
3486    var sel = cm.doc.sel;
3487
3488    for (var i = sel.ranges.length - 1; i >= 0; i--) {
3489      var range = sel.ranges[i];
3490      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) continue;
3491      var mode = cm.getModeAt(range.head);
3492      var indented = false;
3493      if (mode.electricChars) {
3494        for (var j = 0; j < mode.electricChars.length; j++)
3495          if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
3496            indented = indentLine(cm, range.head.line, "smart");
3497            break;
3498          }
3499      } else if (mode.electricInput) {
3500        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
3501          indented = indentLine(cm, range.head.line, "smart");
3502      }
3503      if (indented) signalLater(cm, "electricInput", cm, range.head.line);
3504    }
3505  }
3506
3507  function copyableRanges(cm) {
3508    var text = [], ranges = [];
3509    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
3510      var line = cm.doc.sel.ranges[i].head.line;
3511      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
3512      ranges.push(lineRange);
3513      text.push(cm.getRange(lineRange.anchor, lineRange.head));
3514    }
3515    return {text: text, ranges: ranges};
3516  }
3517
3518  function disableBrowserMagic(field) {
3519    field.setAttribute("autocorrect", "off");
3520    field.setAttribute("autocapitalize", "off");
3521    field.setAttribute("spellcheck", "false");
3522  }
3523
3524  // TEXTAREA INPUT STYLE
3525
3526  function TextareaInput(cm) {
3527    this.cm = cm;
3528    // See input.poll and input.reset
3529    this.prevInput = "";
3530
3531    // Flag that indicates whether we expect input to appear real soon
3532    // now (after some event like 'keypress' or 'input') and are
3533    // polling intensively.
3534    this.pollingFast = false;
3535    // Self-resetting timeout for the poller
3536    this.polling = new Delayed();
3537    // Tracks when input.reset has punted to just putting a short
3538    // string into the textarea instead of the full selection.
3539    this.inaccurateSelection = false;
3540    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
3541    this.hasSelection = false;
3542    this.composing = null;
3543  };
3544
3545  function hiddenTextarea() {
3546    var te = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none");
3547    var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
3548    // The textarea is kept positioned near the cursor to prevent the
3549    // fact that it'll be scrolled into view on input from scrolling
3550    // our fake cursor out of view. On webkit, when wrap=off, paste is
3551    // very slow. So make the area wide instead.
3552    if (webkit) te.style.width = "1000px";
3553    else te.setAttribute("wrap", "off");
3554    // If border: 0; -- iOS fails to open keyboard (issue #1287)
3555    if (ios) te.style.border = "1px solid black";
3556    disableBrowserMagic(te);
3557    return div;
3558  }
3559
3560  TextareaInput.prototype = copyObj({
3561    init: function(display) {
3562      var input = this, cm = this.cm;
3563
3564      // Wraps and hides input textarea
3565      var div = this.wrapper = hiddenTextarea();
3566      // The semihidden textarea that is focused when the editor is
3567      // focused, and receives input.
3568      var te = this.textarea = div.firstChild;
3569      display.wrapper.insertBefore(div, display.wrapper.firstChild);
3570
3571      // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
3572      if (ios) te.style.width = "0px";
3573
3574      on(te, "input", function() {
3575        if (ie && ie_version >= 9 && input.hasSelection) input.hasSelection = null;
3576        input.poll();
3577      });
3578
3579      on(te, "paste", function(e) {
3580        if (signalDOMEvent(cm, e) || handlePaste(e, cm)) return
3581
3582        cm.state.pasteIncoming = true;
3583        input.fastPoll();
3584      });
3585
3586      function prepareCopyCut(e) {
3587        if (signalDOMEvent(cm, e)) return
3588        if (cm.somethingSelected()) {
3589          lastCopied = {lineWise: false, text: cm.getSelections()};
3590          if (input.inaccurateSelection) {
3591            input.prevInput = "";
3592            input.inaccurateSelection = false;
3593            te.value = lastCopied.text.join("\n");
3594            selectInput(te);
3595          }
3596        } else if (!cm.options.lineWiseCopyCut) {
3597          return;
3598        } else {
3599          var ranges = copyableRanges(cm);
3600          lastCopied = {lineWise: true, text: ranges.text};
3601          if (e.type == "cut") {
3602            cm.setSelections(ranges.ranges, null, sel_dontScroll);
3603          } else {
3604            input.prevInput = "";
3605            te.value = ranges.text.join("\n");
3606            selectInput(te);
3607          }
3608        }
3609        if (e.type == "cut") cm.state.cutIncoming = true;
3610      }
3611      on(te, "cut", prepareCopyCut);
3612      on(te, "copy", prepareCopyCut);
3613
3614      on(display.scroller, "paste", function(e) {
3615        if (eventInWidget(display, e) || signalDOMEvent(cm, e)) return;
3616        cm.state.pasteIncoming = true;
3617        input.focus();
3618      });
3619
3620      // Prevent normal selection in the editor (we handle our own)
3621      on(display.lineSpace, "selectstart", function(e) {
3622        if (!eventInWidget(display, e)) e_preventDefault(e);
3623      });
3624
3625      on(te, "compositionstart", function() {
3626        var start = cm.getCursor("from");
3627        if (input.composing) input.composing.range.clear()
3628        input.composing = {
3629          start: start,
3630          range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
3631        };
3632      });
3633      on(te, "compositionend", function() {
3634        if (input.composing) {
3635          input.poll();
3636          input.composing.range.clear();
3637          input.composing = null;
3638        }
3639      });
3640    },
3641
3642    prepareSelection: function() {
3643      // Redraw the selection and/or cursor
3644      var cm = this.cm, display = cm.display, doc = cm.doc;
3645      var result = prepareSelection(cm);
3646
3647      // Move the hidden textarea near the cursor to prevent scrolling artifacts
3648      if (cm.options.moveInputWithCursor) {
3649        var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
3650        var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
3651        result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
3652                                            headPos.top + lineOff.top - wrapOff.top));
3653        result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
3654                                             headPos.left + lineOff.left - wrapOff.left));
3655      }
3656
3657      return result;
3658    },
3659
3660    showSelection: function(drawn) {
3661      var cm = this.cm, display = cm.display;
3662      removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
3663      removeChildrenAndAdd(display.selectionDiv, drawn.selection);
3664      if (drawn.teTop != null) {
3665        this.wrapper.style.top = drawn.teTop + "px";
3666        this.wrapper.style.left = drawn.teLeft + "px";
3667      }
3668    },
3669
3670    // Reset the input to correspond to the selection (or to be empty,
3671    // when not typing and nothing is selected)
3672    reset: function(typing) {
3673      if (this.contextMenuPending) return;
3674      var minimal, selected, cm = this.cm, doc = cm.doc;
3675      if (cm.somethingSelected()) {
3676        this.prevInput = "";
3677        var range = doc.sel.primary();
3678        minimal = hasCopyEvent &&
3679          (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000);
3680        var content = minimal ? "-" : selected || cm.getSelection();
3681        this.textarea.value = content;
3682        if (cm.state.focused) selectInput(this.textarea);
3683        if (ie && ie_version >= 9) this.hasSelection = content;
3684      } else if (!typing) {
3685        this.prevInput = this.textarea.value = "";
3686        if (ie && ie_version >= 9) this.hasSelection = null;
3687      }
3688      this.inaccurateSelection = minimal;
3689    },
3690
3691    getField: function() { return this.textarea; },
3692
3693    supportsTouch: function() { return false; },
3694
3695    focus: function() {
3696      if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
3697        try { this.textarea.focus(); }
3698        catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
3699      }
3700    },
3701
3702    blur: function() { this.textarea.blur(); },
3703
3704    resetPosition: function() {
3705      this.wrapper.style.top = this.wrapper.style.left = 0;
3706    },
3707
3708    receivedFocus: function() { this.slowPoll(); },
3709
3710    // Poll for input changes, using the normal rate of polling. This
3711    // runs as long as the editor is focused.
3712    slowPoll: function() {
3713      var input = this;
3714      if (input.pollingFast) return;
3715      input.polling.set(this.cm.options.pollInterval, function() {
3716        input.poll();
3717        if (input.cm.state.focused) input.slowPoll();
3718      });
3719    },
3720
3721    // When an event has just come in that is likely to add or change
3722    // something in the input textarea, we poll faster, to ensure that
3723    // the change appears on the screen quickly.
3724    fastPoll: function() {
3725      var missed = false, input = this;
3726      input.pollingFast = true;
3727      function p() {
3728        var changed = input.poll();
3729        if (!changed && !missed) {missed = true; input.polling.set(60, p);}
3730        else {input.pollingFast = false; input.slowPoll();}
3731      }
3732      input.polling.set(20, p);
3733    },
3734
3735    // Read input from the textarea, and update the document to match.
3736    // When something is selected, it is present in the textarea, and
3737    // selected (unless it is huge, in which case a placeholder is
3738    // used). When nothing is selected, the cursor sits after previously
3739    // seen text (can be empty), which is stored in prevInput (we must
3740    // not reset the textarea when typing, because that breaks IME).
3741    poll: function() {
3742      var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
3743      // Since this is called a *lot*, try to bail out as cheaply as
3744      // possible when it is clear that nothing happened. hasSelection
3745      // will be the case when there is a lot of text in the textarea,
3746      // in which case reading its value would be expensive.
3747      if (this.contextMenuPending || !cm.state.focused ||
3748          (hasSelection(input) && !prevInput && !this.composing) ||
3749          cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
3750        return false;
3751
3752      var text = input.value;
3753      // If nothing changed, bail.
3754      if (text == prevInput && !cm.somethingSelected()) return false;
3755      // Work around nonsensical selection resetting in IE9/10, and
3756      // inexplicable appearance of private area unicode characters on
3757      // some key combos in Mac (#2689).
3758      if (ie && ie_version >= 9 && this.hasSelection === text ||
3759          mac && /[\uf700-\uf7ff]/.test(text)) {
3760        cm.display.input.reset();
3761        return false;
3762      }
3763
3764      if (cm.doc.sel == cm.display.selForContextMenu) {
3765        var first = text.charCodeAt(0);
3766        if (first == 0x200b && !prevInput) prevInput = "\u200b";
3767        if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo"); }
3768      }
3769      // Find the part of the input that is actually new
3770      var same = 0, l = Math.min(prevInput.length, text.length);
3771      while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
3772
3773      var self = this;
3774      runInOp(cm, function() {
3775        applyTextInput(cm, text.slice(same), prevInput.length - same,
3776                       null, self.composing ? "*compose" : null);
3777
3778        // Don't leave long text in the textarea, since it makes further polling slow
3779        if (text.length > 1000 || text.indexOf("\n") > -1) input.value = self.prevInput = "";
3780        else self.prevInput = text;
3781
3782        if (self.composing) {
3783          self.composing.range.clear();
3784          self.composing.range = cm.markText(self.composing.start, cm.getCursor("to"),
3785                                             {className: "CodeMirror-composing"});
3786        }
3787      });
3788      return true;
3789    },
3790
3791    ensurePolled: function() {
3792      if (this.pollingFast && this.poll()) this.pollingFast = false;
3793    },
3794
3795    onKeyPress: function() {
3796      if (ie && ie_version >= 9) this.hasSelection = null;
3797      this.fastPoll();
3798    },
3799
3800    onContextMenu: function(e) {
3801      var input = this, cm = input.cm, display = cm.display, te = input.textarea;
3802      var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
3803      if (!pos || presto) return; // Opera is difficult.
3804
3805      // Reset the current text selection only if the click is done outside of the selection
3806      // and 'resetSelectionOnContextMenu' option is true.
3807      var reset = cm.options.resetSelectionOnContextMenu;
3808      if (reset && cm.doc.sel.contains(pos) == -1)
3809        operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
3810
3811      var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
3812      input.wrapper.style.cssText = "position: absolute"
3813      var wrapperBox = input.wrapper.getBoundingClientRect()
3814      te.style.cssText = "position: absolute; width: 30px; height: 30px; top: " + (e.clientY - wrapperBox.top - 5) +
3815        "px; left: " + (e.clientX - wrapperBox.left - 5) + "px; z-index: 1000; background: " +
3816        (ie ? "rgba(255, 255, 255, .05)" : "transparent") +
3817        "; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
3818      if (webkit) var oldScrollY = window.scrollY; // Work around Chrome issue (#2712)
3819      display.input.focus();
3820      if (webkit) window.scrollTo(null, oldScrollY);
3821      display.input.reset();
3822      // Adds "Select all" to context menu in FF
3823      if (!cm.somethingSelected()) te.value = input.prevInput = " ";
3824      input.contextMenuPending = true;
3825      display.selForContextMenu = cm.doc.sel;
3826      clearTimeout(display.detectingSelectAll);
3827
3828      // Select-all will be greyed out if there's nothing to select, so
3829      // this adds a zero-width space so that we can later check whether
3830      // it got selected.
3831      function prepareSelectAllHack() {
3832        if (te.selectionStart != null) {
3833          var selected = cm.somethingSelected();
3834          var extval = "\u200b" + (selected ? te.value : "");
3835          te.value = "\u21da"; // Used to catch context-menu undo
3836          te.value = extval;
3837          input.prevInput = selected ? "" : "\u200b";
3838          te.selectionStart = 1; te.selectionEnd = extval.length;
3839          // Re-set this, in case some other handler touched the
3840          // selection in the meantime.
3841          display.selForContextMenu = cm.doc.sel;
3842        }
3843      }
3844      function rehide() {
3845        input.contextMenuPending = false;
3846        input.wrapper.style.cssText = oldWrapperCSS
3847        te.style.cssText = oldCSS;
3848        if (ie && ie_version < 9) display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
3849
3850        // Try to detect the user choosing select-all
3851        if (te.selectionStart != null) {
3852          if (!ie || (ie && ie_version < 9)) prepareSelectAllHack();
3853          var i = 0, poll = function() {
3854            if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
3855                te.selectionEnd > 0 && input.prevInput == "\u200b")
3856              operation(cm, commands.selectAll)(cm);
3857            else if (i++ < 10) display.detectingSelectAll = setTimeout(poll, 500);
3858            else display.input.reset();
3859          };
3860          display.detectingSelectAll = setTimeout(poll, 200);
3861        }
3862      }
3863
3864      if (ie && ie_version >= 9) prepareSelectAllHack();
3865      if (captureRightClick) {
3866        e_stop(e);
3867        var mouseup = function() {
3868          off(window, "mouseup", mouseup);
3869          setTimeout(rehide, 20);
3870        };
3871        on(window, "mouseup", mouseup);
3872      } else {
3873        setTimeout(rehide, 50);
3874      }
3875    },
3876
3877    readOnlyChanged: function(val) {
3878      if (!val) this.reset();
3879    },
3880
3881    setUneditable: nothing,
3882
3883    needsContentAttribute: false
3884  }, TextareaInput.prototype);
3885
3886  // CONTENTEDITABLE INPUT STYLE
3887
3888  function ContentEditableInput(cm) {
3889    this.cm = cm;
3890    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
3891    this.polling = new Delayed();
3892    this.gracePeriod = false;
3893  }
3894
3895  ContentEditableInput.prototype = copyObj({
3896    init: function(display) {
3897      var input = this, cm = input.cm;
3898      var div = input.div = display.lineDiv;
3899      disableBrowserMagic(div);
3900
3901      on(div, "paste", function(e) {
3902        if (!signalDOMEvent(cm, e)) handlePaste(e, cm);
3903      })
3904
3905      on(div, "compositionstart", function(e) {
3906        var data = e.data;
3907        input.composing = {sel: cm.doc.sel, data: data, startData: data};
3908        if (!data) return;
3909        var prim = cm.doc.sel.primary();
3910        var line = cm.getLine(prim.head.line);
3911        var found = line.indexOf(data, Math.max(0, prim.head.ch - data.length));
3912        if (found > -1 && found <= prim.head.ch)
3913          input.composing.sel = simpleSelection(Pos(prim.head.line, found),
3914                                                Pos(prim.head.line, found + data.length));
3915      });
3916      on(div, "compositionupdate", function(e) {
3917        input.composing.data = e.data;
3918      });
3919      on(div, "compositionend", function(e) {
3920        var ours = input.composing;
3921        if (!ours) return;
3922        if (e.data != ours.startData && !/\u200b/.test(e.data))
3923          ours.data = e.data;
3924        // Need a small delay to prevent other code (input event,
3925        // selection polling) from doing damage when fired right after
3926        // compositionend.
3927        setTimeout(function() {
3928          if (!ours.handled)
3929            input.applyComposition(ours);
3930          if (input.composing == ours)
3931            input.composing = null;
3932        }, 50);
3933      });
3934
3935      on(div, "touchstart", function() {
3936        input.forceCompositionEnd();
3937      });
3938
3939      on(div, "input", function() {
3940        if (input.composing) return;
3941        if (cm.isReadOnly() || !input.pollContent())
3942          runInOp(input.cm, function() {regChange(cm);});
3943      });
3944
3945      function onCopyCut(e) {
3946        if (signalDOMEvent(cm, e)) return
3947        if (cm.somethingSelected()) {
3948          lastCopied = {lineWise: false, text: cm.getSelections()};
3949          if (e.type == "cut") cm.replaceSelection("", null, "cut");
3950        } else if (!cm.options.lineWiseCopyCut) {
3951          return;
3952        } else {
3953          var ranges = copyableRanges(cm);
3954          lastCopied = {lineWise: true, text: ranges.text};
3955          if (e.type == "cut") {
3956            cm.operation(function() {
3957              cm.setSelections(ranges.ranges, 0, sel_dontScroll);
3958              cm.replaceSelection("", null, "cut");
3959            });
3960          }
3961        }
3962        // iOS exposes the clipboard API, but seems to discard content inserted into it
3963        if (e.clipboardData && !ios) {
3964          e.preventDefault();
3965          e.clipboardData.clearData();
3966          e.clipboardData.setData("text/plain", lastCopied.text.join("\n"));
3967        } else {
3968          // Old-fashioned briefly-focus-a-textarea hack
3969          var kludge = hiddenTextarea(), te = kludge.firstChild;
3970          cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
3971          te.value = lastCopied.text.join("\n");
3972          var hadFocus = document.activeElement;
3973          selectInput(te);
3974          setTimeout(function() {
3975            cm.display.lineSpace.removeChild(kludge);
3976            hadFocus.focus();
3977          }, 50);
3978        }
3979      }
3980      on(div, "copy", onCopyCut);
3981      on(div, "cut", onCopyCut);
3982    },
3983
3984    prepareSelection: function() {
3985      var result = prepareSelection(this.cm, false);
3986      result.focus = this.cm.state.focused;
3987      return result;
3988    },
3989
3990    showSelection: function(info, takeFocus) {
3991      if (!info || !this.cm.display.view.length) return;
3992      if (info.focus || takeFocus) this.showPrimarySelection();
3993      this.showMultipleSelections(info);
3994    },
3995
3996    showPrimarySelection: function() {
3997      var sel = window.getSelection(), prim = this.cm.doc.sel.primary();
3998      var curAnchor = domToPos(this.cm, sel.anchorNode, sel.anchorOffset);
3999      var curFocus = domToPos(this.cm, sel.focusNode, sel.focusOffset);
4000      if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
4001          cmp(minPos(curAnchor, curFocus), prim.from()) == 0 &&
4002          cmp(maxPos(curAnchor, curFocus), prim.to()) == 0)
4003        return;
4004
4005      var start = posToDOM(this.cm, prim.from());
4006      var end = posToDOM(this.cm, prim.to());
4007      if (!start && !end) return;
4008
4009      var view = this.cm.display.view;
4010      var old = sel.rangeCount && sel.getRangeAt(0);
4011      if (!start) {
4012        start = {node: view[0].measure.map[2], offset: 0};
4013      } else if (!end) { // FIXME dangerously hacky
4014        var measure = view[view.length - 1].measure;
4015        var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
4016        end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
4017      }
4018
4019      try { var rng = range(start.node, start.offset, end.offset, end.node); }
4020      catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
4021      if (rng) {
4022        if (!gecko && this.cm.state.focused) {
4023          sel.collapse(start.node, start.offset);
4024          if (!rng.collapsed) sel.addRange(rng);
4025        } else {
4026          sel.removeAllRanges();
4027          sel.addRange(rng);
4028        }
4029        if (old && sel.anchorNode == null) sel.addRange(old);
4030        else if (gecko) this.startGracePeriod();
4031      }
4032      this.rememberSelection();
4033    },
4034
4035    startGracePeriod: function() {
4036      var input = this;
4037      clearTimeout(this.gracePeriod);
4038      this.gracePeriod = setTimeout(function() {
4039        input.gracePeriod = false;
4040        if (input.selectionChanged())
4041          input.cm.operation(function() { input.cm.curOp.selectionChanged = true; });
4042      }, 20);
4043    },
4044
4045    showMultipleSelections: function(info) {
4046      removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
4047      removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
4048    },
4049
4050    rememberSelection: function() {
4051      var sel = window.getSelection();
4052      this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
4053      this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
4054    },
4055
4056    selectionInEditor: function() {
4057      var sel = window.getSelection();
4058      if (!sel.rangeCount) return false;
4059      var node = sel.getRangeAt(0).commonAncestorContainer;
4060      return contains(this.div, node);
4061    },
4062
4063    focus: function() {
4064      if (this.cm.options.readOnly != "nocursor") this.div.focus();
4065    },
4066    blur: function() { this.div.blur(); },
4067    getField: function() { return this.div; },
4068
4069    supportsTouch: function() { return true; },
4070
4071    receivedFocus: function() {
4072      var input = this;
4073      if (this.selectionInEditor())
4074        this.pollSelection();
4075      else
4076        runInOp(this.cm, function() { input.cm.curOp.selectionChanged = true; });
4077
4078      function poll() {
4079        if (input.cm.state.focused) {
4080          input.pollSelection();
4081          input.polling.set(input.cm.options.pollInterval, poll);
4082        }
4083      }
4084      this.polling.set(this.cm.options.pollInterval, poll);
4085    },
4086
4087    selectionChanged: function() {
4088      var sel = window.getSelection();
4089      return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
4090        sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset;
4091    },
4092
4093    pollSelection: function() {
4094      if (!this.composing && !this.gracePeriod && this.selectionChanged()) {
4095        var sel = window.getSelection(), cm = this.cm;
4096        this.rememberSelection();
4097        var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
4098        var head = domToPos(cm, sel.focusNode, sel.focusOffset);
4099        if (anchor && head) runInOp(cm, function() {
4100          setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
4101          if (anchor.bad || head.bad) cm.curOp.selectionChanged = true;
4102        });
4103      }
4104    },
4105
4106    pollContent: function() {
4107      var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
4108      var from = sel.from(), to = sel.to();
4109      if (from.line < display.viewFrom || to.line > display.viewTo - 1) return false;
4110
4111      var fromIndex;
4112      if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
4113        var fromLine = lineNo(display.view[0].line);
4114        var fromNode = display.view[0].node;
4115      } else {
4116        var fromLine = lineNo(display.view[fromIndex].line);
4117        var fromNode = display.view[fromIndex - 1].node.nextSibling;
4118      }
4119      var toIndex = findViewIndex(cm, to.line);
4120      if (toIndex == display.view.length - 1) {
4121        var toLine = display.viewTo - 1;
4122        var toNode = display.lineDiv.lastChild;
4123      } else {
4124        var toLine = lineNo(display.view[toIndex + 1].line) - 1;
4125        var toNode = display.view[toIndex + 1].node.previousSibling;
4126      }
4127
4128      var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
4129      var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
4130      while (newText.length > 1 && oldText.length > 1) {
4131        if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
4132        else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
4133        else break;
4134      }
4135
4136      var cutFront = 0, cutEnd = 0;
4137      var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
4138      while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
4139        ++cutFront;
4140      var newBot = lst(newText), oldBot = lst(oldText);
4141      var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
4142                               oldBot.length - (oldText.length == 1 ? cutFront : 0));
4143      while (cutEnd < maxCutEnd &&
4144             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
4145        ++cutEnd;
4146
4147      newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd);
4148      newText[0] = newText[0].slice(cutFront);
4149
4150      var chFrom = Pos(fromLine, cutFront);
4151      var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
4152      if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
4153        replaceRange(cm.doc, newText, chFrom, chTo, "+input");
4154        return true;
4155      }
4156    },
4157
4158    ensurePolled: function() {
4159      this.forceCompositionEnd();
4160    },
4161    reset: function() {
4162      this.forceCompositionEnd();
4163    },
4164    forceCompositionEnd: function() {
4165      if (!this.composing || this.composing.handled) return;
4166      this.applyComposition(this.composing);
4167      this.composing.handled = true;
4168      this.div.blur();
4169      this.div.focus();
4170    },
4171    applyComposition: function(composing) {
4172      if (this.cm.isReadOnly())
4173        operation(this.cm, regChange)(this.cm)
4174      else if (composing.data && composing.data != composing.startData)
4175        operation(this.cm, applyTextInput)(this.cm, composing.data, 0, composing.sel);
4176    },
4177
4178    setUneditable: function(node) {
4179      node.contentEditable = "false"
4180    },
4181
4182    onKeyPress: function(e) {
4183      e.preventDefault();
4184      if (!this.cm.isReadOnly())
4185        operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
4186    },
4187
4188    readOnlyChanged: function(val) {
4189      this.div.contentEditable = String(val != "nocursor")
4190    },
4191
4192    onContextMenu: nothing,
4193    resetPosition: nothing,
4194
4195    needsContentAttribute: true
4196  }, ContentEditableInput.prototype);
4197
4198  function posToDOM(cm, pos) {
4199    var view = findViewForLine(cm, pos.line);
4200    if (!view || view.hidden) return null;
4201    var line = getLine(cm.doc, pos.line);
4202    var info = mapFromLineView(view, line, pos.line);
4203
4204    var order = getOrder(line), side = "left";
4205    if (order) {
4206      var partPos = getBidiPartAt(order, pos.ch);
4207      side = partPos % 2 ? "right" : "left";
4208    }
4209    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
4210    result.offset = result.collapse == "right" ? result.end : result.start;
4211    return result;
4212  }
4213
4214  function badPos(pos, bad) { if (bad) pos.bad = true; return pos; }
4215
4216  function domToPos(cm, node, offset) {
4217    var lineNode;
4218    if (node == cm.display.lineDiv) {
4219      lineNode = cm.display.lineDiv.childNodes[offset];
4220      if (!lineNode) return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true);
4221      node = null; offset = 0;
4222    } else {
4223      for (lineNode = node;; lineNode = lineNode.parentNode) {
4224        if (!lineNode || lineNode == cm.display.lineDiv) return null;
4225        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) break;
4226      }
4227    }
4228    for (var i = 0; i < cm.display.view.length; i++) {
4229      var lineView = cm.display.view[i];
4230      if (lineView.node == lineNode)
4231        return locateNodeInLineView(lineView, node, offset);
4232    }
4233  }
4234
4235  function locateNodeInLineView(lineView, node, offset) {
4236    var wrapper = lineView.text.firstChild, bad = false;
4237    if (!node || !contains(wrapper, node)) return badPos(Pos(lineNo(lineView.line), 0), true);
4238    if (node == wrapper) {
4239      bad = true;
4240      node = wrapper.childNodes[offset];
4241      offset = 0;
4242      if (!node) {
4243        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
4244        return badPos(Pos(lineNo(line), line.text.length), bad);
4245      }
4246    }
4247
4248    var textNode = node.nodeType == 3 ? node : null, topNode = node;
4249    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
4250      textNode = node.firstChild;
4251      if (offset) offset = textNode.nodeValue.length;
4252    }
4253    while (topNode.parentNode != wrapper) topNode = topNode.parentNode;
4254    var measure = lineView.measure, maps = measure.maps;
4255
4256    function find(textNode, topNode, offset) {
4257      for (var i = -1; i < (maps ? maps.length : 0); i++) {
4258        var map = i < 0 ? measure.map : maps[i];
4259        for (var j = 0; j < map.length; j += 3) {
4260          var curNode = map[j + 2];
4261          if (curNode == textNode || curNode == topNode) {
4262            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
4263            var ch = map[j] + offset;
4264            if (offset < 0 || curNode != textNode) ch = map[j + (offset ? 1 : 0)];
4265            return Pos(line, ch);
4266          }
4267        }
4268      }
4269    }
4270    var found = find(textNode, topNode, offset);
4271    if (found) return badPos(found, bad);
4272
4273    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
4274    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
4275      found = find(after, after.firstChild, 0);
4276      if (found)
4277        return badPos(Pos(found.line, found.ch - dist), bad);
4278      else
4279        dist += after.textContent.length;
4280    }
4281    for (var before = topNode.previousSibling, dist = offset; before; before = before.previousSibling) {
4282      found = find(before, before.firstChild, -1);
4283      if (found)
4284        return badPos(Pos(found.line, found.ch + dist), bad);
4285      else
4286        dist += after.textContent.length;
4287    }
4288  }
4289
4290  function domTextBetween(cm, from, to, fromLine, toLine) {
4291    var text = "", closing = false, lineSep = cm.doc.lineSeparator();
4292    function recognizeMarker(id) { return function(marker) { return marker.id == id; }; }
4293    function walk(node) {
4294      if (node.nodeType == 1) {
4295        var cmText = node.getAttribute("cm-text");
4296        if (cmText != null) {
4297          if (cmText == "") cmText = node.textContent.replace(/\u200b/g, "");
4298          text += cmText;
4299          return;
4300        }
4301        var markerID = node.getAttribute("cm-marker"), range;
4302        if (markerID) {
4303          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
4304          if (found.length && (range = found[0].find()))
4305            text += getBetween(cm.doc, range.from, range.to).join(lineSep);
4306          return;
4307        }
4308        if (node.getAttribute("contenteditable") == "false") return;
4309        for (var i = 0; i < node.childNodes.length; i++)
4310          walk(node.childNodes[i]);
4311        if (/^(pre|div|p)$/i.test(node.nodeName))
4312          closing = true;
4313      } else if (node.nodeType == 3) {
4314        var val = node.nodeValue;
4315        if (!val) return;
4316        if (closing) {
4317          text += lineSep;
4318          closing = false;
4319        }
4320        text += val;
4321      }
4322    }
4323    for (;;) {
4324      walk(from);
4325      if (from == to) break;
4326      from = from.nextSibling;
4327    }
4328    return text;
4329  }
4330
4331  CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};
4332
4333  // SELECTION / CURSOR
4334
4335  // Selection objects are immutable. A new one is created every time
4336  // the selection changes. A selection is one or more non-overlapping
4337  // (and non-touching) ranges, sorted, and an integer that indicates
4338  // which one is the primary selection (the one that's scrolled into
4339  // view, that getCursor returns, etc).
4340  function Selection(ranges, primIndex) {
4341    this.ranges = ranges;
4342    this.primIndex = primIndex;
4343  }
4344
4345  Selection.prototype = {
4346    primary: function() { return this.ranges[this.primIndex]; },
4347    equals: function(other) {
4348      if (other == this) return true;
4349      if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) return false;
4350      for (var i = 0; i < this.ranges.length; i++) {
4351        var here = this.ranges[i], there = other.ranges[i];
4352        if (cmp(here.anchor, there.anchor) != 0 || cmp(here.head, there.head) != 0) return false;
4353      }
4354      return true;
4355    },
4356    deepCopy: function() {
4357      for (var out = [], i = 0; i < this.ranges.length; i++)
4358        out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head));
4359      return new Selection(out, this.primIndex);
4360    },
4361    somethingSelected: function() {
4362      for (var i = 0; i < this.ranges.length; i++)
4363        if (!this.ranges[i].empty()) return true;
4364      return false;
4365    },
4366    contains: function(pos, end) {
4367      if (!end) end = pos;
4368      for (var i = 0; i < this.ranges.length; i++) {
4369        var range = this.ranges[i];
4370        if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
4371          return i;
4372      }
4373      return -1;
4374    }
4375  };
4376
4377  function Range(anchor, head) {
4378    this.anchor = anchor; this.head = head;
4379  }
4380
4381  Range.prototype = {
4382    from: function() { return minPos(this.anchor, this.head); },
4383    to: function() { return maxPos(this.anchor, this.head); },
4384    empty: function() {
4385      return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch;
4386    }
4387  };
4388
4389  // Take an unsorted, potentially overlapping set of ranges, and
4390  // build a selection out of it. 'Consumes' ranges array (modifying
4391  // it).
4392  function normalizeSelection(ranges, primIndex) {
4393    var prim = ranges[primIndex];
4394    ranges.sort(function(a, b) { return cmp(a.from(), b.from()); });
4395    primIndex = indexOf(ranges, prim);
4396    for (var i = 1; i < ranges.length; i++) {
4397      var cur = ranges[i], prev = ranges[i - 1];
4398      if (cmp(prev.to(), cur.from()) >= 0) {
4399        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
4400        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
4401        if (i <= primIndex) --primIndex;
4402        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
4403      }
4404    }
4405    return new Selection(ranges, primIndex);
4406  }
4407
4408  function simpleSelection(anchor, head) {
4409    return new Selection([new Range(anchor, head || anchor)], 0);
4410  }
4411
4412  // Most of the external API clips given positions to make sure they
4413  // actually exist within the document.
4414  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}
4415  function clipPos(doc, pos) {
4416    if (pos.line < doc.first) return Pos(doc.first, 0);
4417    var last = doc.first + doc.size - 1;
4418    if (pos.line > last) return Pos(last, getLine(doc, last).text.length);
4419    return clipToLen(pos, getLine(doc, pos.line).text.length);
4420  }
4421  function clipToLen(pos, linelen) {
4422    var ch = pos.ch;
4423    if (ch == null || ch > linelen) return Pos(pos.line, linelen);
4424    else if (ch < 0) return Pos(pos.line, 0);
4425    else return pos;
4426  }
4427  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
4428  function clipPosArray(doc, array) {
4429    for (var out = [], i = 0; i < array.length; i++) out[i] = clipPos(doc, array[i]);
4430    return out;
4431  }
4432
4433  // SELECTION UPDATES
4434
4435  // The 'scroll' parameter given to many of these indicated whether
4436  // the new cursor position should be scrolled into view after
4437  // modifying the selection.
4438
4439  // If shift is held or the extend flag is set, extends a range to
4440  // include a given position (and optionally a second position).
4441  // Otherwise, simply returns the range between the given positions.
4442  // Used for cursor motion and such.
4443  function extendRange(doc, range, head, other) {
4444    if (doc.cm && doc.cm.display.shift || doc.extend) {
4445      var anchor = range.anchor;
4446      if (other) {
4447        var posBefore = cmp(head, anchor) < 0;
4448        if (posBefore != (cmp(other, anchor) < 0)) {
4449          anchor = head;
4450          head = other;
4451        } else if (posBefore != (cmp(head, other) < 0)) {
4452          head = other;
4453        }
4454      }
4455      return new Range(anchor, head);
4456    } else {
4457      return new Range(other || head, head);
4458    }
4459  }
4460
4461  // Extend the primary selection range, discard the rest.
4462  function extendSelection(doc, head, other, options) {
4463    setSelection(doc, new Selection([extendRange(doc, doc.sel.primary(), head, other)], 0), options);
4464  }
4465
4466  // Extend all selections (pos is an array of selections with length
4467  // equal the number of selections)
4468  function extendSelections(doc, heads, options) {
4469    for (var out = [], i = 0; i < doc.sel.ranges.length; i++)
4470      out[i] = extendRange(doc, doc.sel.ranges[i], heads[i], null);
4471    var newSel = normalizeSelection(out, doc.sel.primIndex);
4472    setSelection(doc, newSel, options);
4473  }
4474
4475  // Updates a single range in the selection.
4476  function replaceOneSelection(doc, i, range, options) {
4477    var ranges = doc.sel.ranges.slice(0);
4478    ranges[i] = range;
4479    setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
4480  }
4481
4482  // Reset the selection to a single range.
4483  function setSimpleSelection(doc, anchor, head, options) {
4484    setSelection(doc, simpleSelection(anchor, head), options);
4485  }
4486
4487  // Give beforeSelectionChange handlers a change to influence a
4488  // selection update.
4489  function filterSelectionChange(doc, sel, options) {
4490    var obj = {
4491      ranges: sel.ranges,
4492      update: function(ranges) {
4493        this.ranges = [];
4494        for (var i = 0; i < ranges.length; i++)
4495          this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
4496                                     clipPos(doc, ranges[i].head));
4497      },
4498      origin: options && options.origin
4499    };
4500    signal(doc, "beforeSelectionChange", doc, obj);
4501    if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
4502    if (obj.ranges != sel.ranges) return normalizeSelection(obj.ranges, obj.ranges.length - 1);
4503    else return sel;
4504  }
4505
4506  function setSelectionReplaceHistory(doc, sel, options) {
4507    var done = doc.history.done, last = lst(done);
4508    if (last && last.ranges) {
4509      done[done.length - 1] = sel;
4510      setSelectionNoUndo(doc, sel, options);
4511    } else {
4512      setSelection(doc, sel, options);
4513    }
4514  }
4515
4516  // Set a new selection.
4517  function setSelection(doc, sel, options) {
4518    setSelectionNoUndo(doc, sel, options);
4519    addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
4520  }
4521
4522  function setSelectionNoUndo(doc, sel, options) {
4523    if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
4524      sel = filterSelectionChange(doc, sel, options);
4525
4526    var bias = options && options.bias ||
4527      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
4528    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));
4529
4530    if (!(options && options.scroll === false) && doc.cm)
4531      ensureCursorVisible(doc.cm);
4532  }
4533
4534  function setSelectionInner(doc, sel) {
4535    if (sel.equals(doc.sel)) return;
4536
4537    doc.sel = sel;
4538
4539    if (doc.cm) {
4540      doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
4541      signalCursorActivity(doc.cm);
4542    }
4543    signalLater(doc, "cursorActivity", doc);
4544  }
4545
4546  // Verify that the selection does not partially select any atomic
4547  // marked ranges.
4548  function reCheckSelection(doc) {
4549    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll);
4550  }
4551
4552  // Return a selection that does not partially select any atomic
4553  // ranges.
4554  function skipAtomicInSelection(doc, sel, bias, mayClear) {
4555    var out;
4556    for (var i = 0; i < sel.ranges.length; i++) {
4557      var range = sel.ranges[i];
4558      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
4559      var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
4560      var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
4561      if (out || newAnchor != range.anchor || newHead != range.head) {
4562        if (!out) out = sel.ranges.slice(0, i);
4563        out[i] = new Range(newAnchor, newHead);
4564      }
4565    }
4566    return out ? normalizeSelection(out, sel.primIndex) : sel;
4567  }
4568
4569  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
4570    var line = getLine(doc, pos.line);
4571    if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
4572      var sp = line.markedSpans[i], m = sp.marker;
4573      if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
4574          (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
4575        if (mayClear) {
4576          signal(m, "beforeCursorEnter");
4577          if (m.explicitlyCleared) {
4578            if (!line.markedSpans) break;
4579            else {--i; continue;}
4580          }
4581        }
4582        if (!m.atomic) continue;
4583
4584        if (oldPos) {
4585          var near = m.find(dir < 0 ? 1 : -1), diff;
4586          if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft)
4587            near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null);
4588          if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
4589            return skipAtomicInner(doc, near, pos, dir, mayClear);
4590        }
4591
4592        var far = m.find(dir < 0 ? -1 : 1);
4593        if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight)
4594          far = movePos(doc, far, dir, far.line == pos.line ? line : null);
4595        return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null;
4596      }
4597    }
4598    return pos;
4599  }
4600
4601  // Ensure a given position is not inside an atomic range.
4602  function skipAtomic(doc, pos, oldPos, bias, mayClear) {
4603    var dir = bias || 1;
4604    var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
4605        (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
4606        skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
4607        (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
4608    if (!found) {
4609      doc.cantEdit = true;
4610      return Pos(doc.first, 0);
4611    }
4612    return found;
4613  }
4614
4615  function movePos(doc, pos, dir, line) {
4616    if (dir < 0 && pos.ch == 0) {
4617      if (pos.line > doc.first) return clipPos(doc, Pos(pos.line - 1));
4618      else return null;
4619    } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
4620      if (pos.line < doc.first + doc.size - 1) return Pos(pos.line + 1, 0);
4621      else return null;
4622    } else {
4623      return new Pos(pos.line, pos.ch + dir);
4624    }
4625  }
4626
4627  // SELECTION DRAWING
4628
4629  function updateSelection(cm) {
4630    cm.display.input.showSelection(cm.display.input.prepareSelection());
4631  }
4632
4633  function prepareSelection(cm, primary) {
4634    var doc = cm.doc, result = {};
4635    var curFragment = result.cursors = document.createDocumentFragment();
4636    var selFragment = result.selection = document.createDocumentFragment();
4637
4638    for (var i = 0; i < doc.sel.ranges.length; i++) {
4639      if (primary === false && i == doc.sel.primIndex) continue;
4640      var range = doc.sel.ranges[i];
4641      if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) continue;
4642      var collapsed = range.empty();
4643      if (collapsed || cm.options.showCursorWhenSelecting)
4644        drawSelectionCursor(cm, range.head, curFragment);
4645      if (!collapsed)
4646        drawSelectionRange(cm, range, selFragment);
4647    }
4648    return result;
4649  }
4650
4651  // Draws a cursor for the given range
4652  function drawSelectionCursor(cm, head, output) {
4653    var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);
4654
4655    var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
4656    cursor.style.left = pos.left + "px";
4657    cursor.style.top = pos.top + "px";
4658    cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
4659
4660    if (pos.other) {
4661      // Secondary cursor, shown when on a 'jump' in bi-directional text
4662      var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
4663      otherCursor.style.display = "";
4664      otherCursor.style.left = pos.other.left + "px";
4665      otherCursor.style.top = pos.other.top + "px";
4666      otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
4667    }
4668  }
4669
4670  // Draws the given range as a highlighted selection
4671  function drawSelectionRange(cm, range, output) {
4672    var display = cm.display, doc = cm.doc;
4673    var fragment = document.createDocumentFragment();
4674    var padding = paddingH(cm.display), leftSide = padding.left;
4675    var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
4676
4677    function add(left, top, width, bottom) {
4678      if (top < 0) top = 0;
4679      top = Math.round(top);
4680      bottom = Math.round(bottom);
4681      fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
4682                               "px; top: " + top + "px; width: " + (width == null ? rightSide - left : width) +
4683                               "px; height: " + (bottom - top) + "px"));
4684    }
4685
4686    function drawForLine(line, fromArg, toArg) {
4687      var lineObj = getLine(doc, line);
4688      var lineLen = lineObj.text.length;
4689      var start, end;
4690      function coords(ch, bias) {
4691        return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
4692      }
4693
4694      iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {
4695        var leftPos = coords(from, "left"), rightPos, left, right;
4696        if (from == to) {
4697          rightPos = leftPos;
4698          left = right = leftPos.left;
4699        } else {
4700          rightPos = coords(to - 1, "right");
4701          if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
4702          left = leftPos.left;
4703          right = rightPos.right;
4704        }
4705        if (fromArg == null && from == 0) left = leftSide;
4706        if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
4707          add(left, leftPos.top, null, leftPos.bottom);
4708          left = leftSide;
4709          if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
4710        }
4711        if (toArg == null && to == lineLen) right = rightSide;
4712        if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
4713          start = leftPos;
4714        if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
4715          end = rightPos;
4716        if (left < leftSide + 1) left = leftSide;
4717        add(left, rightPos.top, right - left, rightPos.bottom);
4718      });
4719      return {start: start, end: end};
4720    }
4721
4722    var sFrom = range.from(), sTo = range.to();
4723    if (sFrom.line == sTo.line) {
4724      drawForLine(sFrom.line, sFrom.ch, sTo.ch);
4725    } else {
4726      var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
4727      var singleVLine = visualLine(fromLine) == visualLine(toLine);
4728      var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
4729      var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
4730      if (singleVLine) {
4731        if (leftEnd.top < rightStart.top - 2) {
4732          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
4733          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
4734        } else {
4735          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
4736        }
4737      }
4738      if (leftEnd.bottom < rightStart.top)
4739        add(leftSide, leftEnd.bottom, null, rightStart.top);
4740    }
4741
4742    output.appendChild(fragment);
4743  }
4744
4745  // Cursor-blinking
4746  function restartBlink(cm) {
4747    if (!cm.state.focused) return;
4748    var display = cm.display;
4749    clearInterval(display.blinker);
4750    var on = true;
4751    display.cursorDiv.style.visibility = "";
4752    if (cm.options.cursorBlinkRate > 0)
4753      display.blinker = setInterval(function() {
4754        display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
4755      }, cm.options.cursorBlinkRate);
4756    else if (cm.options.cursorBlinkRate < 0)
4757      display.cursorDiv.style.visibility = "hidden";
4758  }
4759
4760  // HIGHLIGHT WORKER
4761
4762  function startWorker(cm, time) {
4763    if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo)
4764      cm.state.highlight.set(time, bind(highlightWorker, cm));
4765  }
4766
4767  function highlightWorker(cm) {
4768    var doc = cm.doc;
4769    if (doc.frontier < doc.first) doc.frontier = doc.first;
4770    if (doc.frontier >= cm.display.viewTo) return;
4771    var end = +new Date + cm.options.workTime;
4772    var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
4773    var changedLines = [];
4774
4775    doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
4776      if (doc.frontier >= cm.display.viewFrom) { // Visible
4777        var oldStyles = line.styles, tooLong = line.text.length > cm.options.maxHighlightLength;
4778        var highlighted = highlightLine(cm, line, tooLong ? copyState(doc.mode, state) : state, true);
4779        line.styles = highlighted.styles;
4780        var oldCls = line.styleClasses, newCls = highlighted.classes;
4781        if (newCls) line.styleClasses = newCls;
4782        else if (oldCls) line.styleClasses = null;
4783        var ischange = !oldStyles || oldStyles.length != line.styles.length ||
4784          oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
4785        for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
4786        if (ischange) changedLines.push(doc.frontier);
4787        line.stateAfter = tooLong ? state : copyState(doc.mode, state);
4788      } else {
4789        if (line.text.length <= cm.options.maxHighlightLength)
4790          processLine(cm, line.text, state);
4791        line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
4792      }
4793      ++doc.frontier;
4794      if (+new Date > end) {
4795        startWorker(cm, cm.options.workDelay);
4796        return true;
4797      }
4798    });
4799    if (changedLines.length) runInOp(cm, function() {
4800      for (var i = 0; i < changedLines.length; i++)
4801        regLineChange(cm, changedLines[i], "text");
4802    });
4803  }
4804
4805  // Finds the line to start with when starting a parse. Tries to
4806  // find a line with a stateAfter, so that it can start with a
4807  // valid state. If that fails, it returns the line with the
4808  // smallest indentation, which tends to need the least context to
4809  // parse correctly.
4810  function findStartLine(cm, n, precise) {
4811    var minindent, minline, doc = cm.doc;
4812    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
4813    for (var search = n; search > lim; --search) {
4814      if (search <= doc.first) return doc.first;
4815      var line = getLine(doc, search - 1);
4816      if (line.stateAfter && (!precise || search <= doc.frontier)) return search;
4817      var indented = countColumn(line.text, null, cm.options.tabSize);
4818      if (minline == null || minindent > indented) {
4819        minline = search - 1;
4820        minindent = indented;
4821      }
4822    }
4823    return minline;
4824  }
4825
4826  function getStateBefore(cm, n, precise) {
4827    var doc = cm.doc, display = cm.display;
4828    if (!doc.mode.startState) return true;
4829    var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter;
4830    if (!state) state = startState(doc.mode);
4831    else state = copyState(doc.mode, state);
4832    doc.iter(pos, n, function(line) {
4833      processLine(cm, line.text, state);
4834      var save = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo;
4835      line.stateAfter = save ? copyState(doc.mode, state) : null;
4836      ++pos;
4837    });
4838    if (precise) doc.frontier = pos;
4839    return state;
4840  }
4841
4842  // POSITION MEASUREMENT
4843
4844  function paddingTop(display) {return display.lineSpace.offsetTop;}
4845  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}
4846  function paddingH(display) {
4847    if (display.cachedPaddingH) return display.cachedPaddingH;
4848    var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
4849    var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
4850    var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
4851    if (!isNaN(data.left) && !isNaN(data.right)) display.cachedPaddingH = data;
4852    return data;
4853  }
4854
4855  function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth; }
4856  function displayWidth(cm) {
4857    return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth;
4858  }
4859  function displayHeight(cm) {
4860    return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight;
4861  }
4862
4863  // Ensure the lineView.wrapping.heights array is populated. This is
4864  // an array of bottom offsets for the lines that make up a drawn
4865  // line. When lineWrapping is on, there might be more than one
4866  // height.
4867  function ensureLineHeights(cm, lineView, rect) {
4868    var wrapping = cm.options.lineWrapping;
4869    var curWidth = wrapping && displayWidth(cm);
4870    if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
4871      var heights = lineView.measure.heights = [];
4872      if (wrapping) {
4873        lineView.measure.width = curWidth;
4874        var rects = lineView.text.firstChild.getClientRects();
4875        for (var i = 0; i < rects.length - 1; i++) {
4876          var cur = rects[i], next = rects[i + 1];
4877          if (Math.abs(cur.bottom - next.bottom) > 2)
4878            heights.push((cur.bottom + next.top) / 2 - rect.top);
4879        }
4880      }
4881      heights.push(rect.bottom - rect.top);
4882    }
4883  }
4884
4885  // Find a line map (mapping character offsets to text nodes) and a
4886  // measurement cache for the given line number. (A line view might
4887  // contain multiple lines when collapsed ranges are present.)
4888  function mapFromLineView(lineView, line, lineN) {
4889    if (lineView.line == line)
4890      return {map: lineView.measure.map, cache: lineView.measure.cache};
4891    for (var i = 0; i < lineView.rest.length; i++)
4892      if (lineView.rest[i] == line)
4893        return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]};
4894    for (var i = 0; i < lineView.rest.length; i++)
4895      if (lineNo(lineView.rest[i]) > lineN)
4896        return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i], before: true};
4897  }
4898
4899  // Render a line into the hidden node display.externalMeasured. Used
4900  // when measurement is needed for a line that's not in the viewport.
4901  function updateExternalMeasurement(cm, line) {
4902    line = visualLine(line);
4903    var lineN = lineNo(line);
4904    var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
4905    view.lineN = lineN;
4906    var built = view.built = buildLineContent(cm, view);
4907    view.text = built.pre;
4908    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
4909    return view;
4910  }
4911
4912  // Get a {top, bottom, left, right} box (in line-local coordinates)
4913  // for a given character.
4914  function measureChar(cm, line, ch, bias) {
4915    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias);
4916  }
4917
4918  // Find a line view that corresponds to the given line number.
4919  function findViewForLine(cm, lineN) {
4920    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
4921      return cm.display.view[findViewIndex(cm, lineN)];
4922    var ext = cm.display.externalMeasured;
4923    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
4924      return ext;
4925  }
4926
4927  // Measurement can be split in two steps, the set-up work that
4928  // applies to the whole line, and the measurement of the actual
4929  // character. Functions like coordsChar, that need to do a lot of
4930  // measurements in a row, can thus ensure that the set-up work is
4931  // only done once.
4932  function prepareMeasureForLine(cm, line) {
4933    var lineN = lineNo(line);
4934    var view = findViewForLine(cm, lineN);
4935    if (view && !view.text) {
4936      view = null;
4937    } else if (view && view.changes) {
4938      updateLineForChanges(cm, view, lineN, getDimensions(cm));
4939      cm.curOp.forceUpdate = true;
4940    }
4941    if (!view)
4942      view = updateExternalMeasurement(cm, line);
4943
4944    var info = mapFromLineView(view, line, lineN);
4945    return {
4946      line: line, view: view, rect: null,
4947      map: info.map, cache: info.cache, before: info.before,
4948      hasHeights: false
4949    };
4950  }
4951
4952  // Given a prepared measurement object, measures the position of an
4953  // actual character (or fetches it from the cache).
4954  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
4955    if (prepared.before) ch = -1;
4956    var key = ch + (bias || ""), found;
4957    if (prepared.cache.hasOwnProperty(key)) {
4958      found = prepared.cache[key];
4959    } else {
4960      if (!prepared.rect)
4961        prepared.rect = prepared.view.text.getBoundingClientRect();
4962      if (!prepared.hasHeights) {
4963        ensureLineHeights(cm, prepared.view, prepared.rect);
4964        prepared.hasHeights = true;
4965      }
4966      found = measureCharInner(cm, prepared, ch, bias);
4967      if (!found.bogus) prepared.cache[key] = found;
4968    }
4969    return {left: found.left, right: found.right,
4970            top: varHeight ? found.rtop : found.top,
4971            bottom: varHeight ? found.rbottom : found.bottom};
4972  }
4973
4974  var nullRect = {left: 0, right: 0, top: 0, bottom: 0};
4975
4976  function nodeAndOffsetInLineMap(map, ch, bias) {
4977    var node, start, end, collapse;
4978    // First, search the line map for the text node corresponding to,
4979    // or closest to, the target character.
4980    for (var i = 0; i < map.length; i += 3) {
4981      var mStart = map[i], mEnd = map[i + 1];
4982      if (ch < mStart) {
4983        start = 0; end = 1;
4984        collapse = "left";
4985      } else if (ch < mEnd) {
4986        start = ch - mStart;
4987        end = start + 1;
4988      } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
4989        end = mEnd - mStart;
4990        start = end - 1;
4991        if (ch >= mEnd) collapse = "right";
4992      }
4993      if (start != null) {
4994        node = map[i + 2];
4995        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
4996          collapse = bias;
4997        if (bias == "left" && start == 0)
4998          while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
4999            node = map[(i -= 3) + 2];
5000            collapse = "left";
5001          }
5002        if (bias == "right" && start == mEnd - mStart)
5003          while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
5004            node = map[(i += 3) + 2];
5005            collapse = "right";
5006          }
5007        break;
5008      }
5009    }
5010    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd};
5011  }
5012
5013  function measureCharInner(cm, prepared, ch, bias) {
5014    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
5015    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;
5016
5017    var rect;
5018    if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
5019      for (var i = 0; i < 4; i++) { // Retry a maximum of 4 times when nonsense rectangles are returned
5020        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) --start;
5021        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) ++end;
5022        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) {
5023          rect = node.parentNode.getBoundingClientRect();
5024        } else if (ie && cm.options.lineWrapping) {
5025          var rects = range(node, start, end).getClientRects();
5026          if (rects.length)
5027            rect = rects[bias == "right" ? rects.length - 1 : 0];
5028          else
5029            rect = nullRect;
5030        } else {
5031          rect = range(node, start, end).getBoundingClientRect() || nullRect;
5032        }
5033        if (rect.left || rect.right || start == 0) break;
5034        end = start;
5035        start = start - 1;
5036        collapse = "right";
5037      }
5038      if (ie && ie_version < 11) rect = maybeUpdateRectForZooming(cm.display.measure, rect);
5039    } else { // If it is a widget, simply get the box for the whole widget.
5040      if (start > 0) collapse = bias = "right";
5041      var rects;
5042      if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
5043        rect = rects[bias == "right" ? rects.length - 1 : 0];
5044      else
5045        rect = node.getBoundingClientRect();
5046    }
5047    if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
5048      var rSpan = node.parentNode.getClientRects()[0];
5049      if (rSpan)
5050        rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom};
5051      else
5052        rect = nullRect;
5053    }
5054
5055    var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
5056    var mid = (rtop + rbot) / 2;
5057    var heights = prepared.view.measure.heights;
5058    for (var i = 0; i < heights.length - 1; i++)
5059      if (mid < heights[i]) break;
5060    var top = i ? heights[i - 1] : 0, bot = heights[i];
5061    var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
5062                  right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
5063                  top: top, bottom: bot};
5064    if (!rect.left && !rect.right) result.bogus = true;
5065    if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }
5066
5067    return result;
5068  }
5069
5070  // Work around problem with bounding client rects on ranges being
5071  // returned incorrectly when zoomed on IE10 and below.
5072  function maybeUpdateRectForZooming(measure, rect) {
5073    if (!window.screen || screen.logicalXDPI == null ||
5074        screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
5075      return rect;
5076    var scaleX = screen.logicalXDPI / screen.deviceXDPI;
5077    var scaleY = screen.logicalYDPI / screen.deviceYDPI;
5078    return {left: rect.left * scaleX, right: rect.right * scaleX,
5079            top: rect.top * scaleY, bottom: rect.bottom * scaleY};
5080  }
5081
5082  function clearLineMeasurementCacheFor(lineView) {
5083    if (lineView.measure) {
5084      lineView.measure.cache = {};
5085      lineView.measure.heights = null;
5086      if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
5087        lineView.measure.caches[i] = {};
5088    }
5089  }
5090
5091  function clearLineMeasurementCache(cm) {
5092    cm.display.externalMeasure = null;
5093    removeChildren(cm.display.lineMeasure);
5094    for (var i = 0; i < cm.display.view.length; i++)
5095      clearLineMeasurementCacheFor(cm.display.view[i]);
5096  }
5097
5098  function clearCaches(cm) {
5099    clearLineMeasurementCache(cm);
5100    cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
5101    if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;
5102    cm.display.lineNumChars = null;
5103  }
5104
5105  function pageScrollX() { return window.pageXOffset || (document.documentElement || document.body).scrollLeft; }
5106  function pageScrollY() { return window.pageYOffset || (document.documentElement || document.body).scrollTop; }
5107
5108  // Converts a {top, bottom, left, right} box from line-local
5109  // coordinates into another coordinate system. Context may be one of
5110  // "line", "div" (display.lineDiv), "local"/null (editor), "window",
5111  // or "page".
5112  function intoCoordSystem(cm, lineObj, rect, context) {
5113    if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {
5114      var size = widgetHeight(lineObj.widgets[i]);
5115      rect.top += size; rect.bottom += size;
5116    }
5117    if (context == "line") return rect;
5118    if (!context) context = "local";
5119    var yOff = heightAtLine(lineObj);
5120    if (context == "local") yOff += paddingTop(cm.display);
5121    else yOff -= cm.display.viewOffset;
5122    if (context == "page" || context == "window") {
5123      var lOff = cm.display.lineSpace.getBoundingClientRect();
5124      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
5125      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
5126      rect.left += xOff; rect.right += xOff;
5127    }
5128    rect.top += yOff; rect.bottom += yOff;
5129    return rect;
5130  }
5131
5132  // Coverts a box from "div" coords to another coordinate system.
5133  // Context may be "window", "page", "div", or "local"/null.
5134  function fromCoordSystem(cm, coords, context) {
5135    if (context == "div") return coords;
5136    var left = coords.left, top = coords.top;
5137    // First move into "page" coordinate system
5138    if (context == "page") {
5139      left -= pageScrollX();
5140      top -= pageScrollY();
5141    } else if (context == "local" || !context) {
5142      var localBox = cm.display.sizer.getBoundingClientRect();
5143      left += localBox.left;
5144      top += localBox.top;
5145    }
5146
5147    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
5148    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top};
5149  }
5150
5151  function charCoords(cm, pos, context, lineObj, bias) {
5152    if (!lineObj) lineObj = getLine(cm.doc, pos.line);
5153    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context);
5154  }
5155
5156  // Returns a box for a given cursor position, which may have an
5157  // 'other' property containing the position of the secondary cursor
5158  // on a bidi boundary.
5159  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
5160    lineObj = lineObj || getLine(cm.doc, pos.line);
5161    if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj);
5162    function get(ch, right) {
5163      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
5164      if (right) m.left = m.right; else m.right = m.left;
5165      return intoCoordSystem(cm, lineObj, m, context);
5166    }
5167    function getBidi(ch, partPos) {
5168      var part = order[partPos], right = part.level % 2;
5169      if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {
5170        part = order[--partPos];
5171        ch = bidiRight(part) - (part.level % 2 ? 0 : 1);
5172        right = true;
5173      } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {
5174        part = order[++partPos];
5175        ch = bidiLeft(part) - part.level % 2;
5176        right = false;
5177      }
5178      if (right && ch == part.to && ch > part.from) return get(ch - 1);
5179      return get(ch, right);
5180    }
5181    var order = getOrder(lineObj), ch = pos.ch;
5182    if (!order) return get(ch);
5183    var partPos = getBidiPartAt(order, ch);
5184    var val = getBidi(ch, partPos);
5185    if (bidiOther != null) val.other = getBidi(ch, bidiOther);
5186    return val;
5187  }
5188
5189  // Used to cheaply estimate the coordinates for a position. Used for
5190  // intermediate scroll updates.
5191  function estimateCoords(cm, pos) {
5192    var left = 0, pos = clipPos(cm.doc, pos);
5193    if (!cm.options.lineWrapping) left = charWidth(cm.display) * pos.ch;
5194    var lineObj = getLine(cm.doc, pos.line);
5195    var top = heightAtLine(lineObj) + paddingTop(cm.display);
5196    return {left: left, right: left, top: top, bottom: top + lineObj.height};
5197  }
5198
5199  // Positions returned by coordsChar contain some extra information.
5200  // xRel is the relative x position of the input coordinates compared
5201  // to the found position (so xRel > 0 means the coordinates are to
5202  // the right of the character position, for example). When outside
5203  // is true, that means the coordinates lie outside the line's
5204  // vertical range.
5205  function PosWithInfo(line, ch, outside, xRel) {
5206    var pos = Pos(line, ch);
5207    pos.xRel = xRel;
5208    if (outside) pos.outside = true;
5209    return pos;
5210  }
5211
5212  // Compute the character position closest to the given coordinates.
5213  // Input must be lineSpace-local ("div" coordinate system).
5214  function coordsChar(cm, x, y) {
5215    var doc = cm.doc;
5216    y += cm.display.viewOffset;
5217    if (y < 0) return PosWithInfo(doc.first, 0, true, -1);
5218    var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
5219    if (lineN > last)
5220      return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
5221    if (x < 0) x = 0;
5222
5223    var lineObj = getLine(doc, lineN);
5224    for (;;) {
5225      var found = coordsCharInner(cm, lineObj, lineN, x, y);
5226      var merged = collapsedSpanAtEnd(lineObj);
5227      var mergedPos = merged && merged.find(0, true);
5228      if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
5229        lineN = lineNo(lineObj = mergedPos.to.line);
5230      else
5231        return found;
5232    }
5233  }
5234
5235  function coordsCharInner(cm, lineObj, lineNo, x, y) {
5236    var innerOff = y - heightAtLine(lineObj);
5237    var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
5238    var preparedMeasure = prepareMeasureForLine(cm, lineObj);
5239
5240    function getX(ch) {
5241      var sp = cursorCoords(cm, Pos(lineNo, ch), "line", lineObj, preparedMeasure);
5242      wrongLine = true;
5243      if (innerOff > sp.bottom) return sp.left - adjust;
5244      else if (innerOff < sp.top) return sp.left + adjust;
5245      else wrongLine = false;
5246      return sp.left;
5247    }
5248
5249    var bidi = getOrder(lineObj), dist = lineObj.text.length;
5250    var from = lineLeft(lineObj), to = lineRight(lineObj);
5251    var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
5252
5253    if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);
5254    // Do a binary search between these bounds.
5255    for (;;) {
5256      if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
5257        var ch = x < fromX || x - fromX <= toX - x ? from : to;
5258        var xDiff = x - (ch == from ? fromX : toX);
5259        while (isExtendingChar(lineObj.text.charAt(ch))) ++ch;
5260        var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
5261                              xDiff < -1 ? -1 : xDiff > 1 ? 1 : 0);
5262        return pos;
5263      }
5264      var step = Math.ceil(dist / 2), middle = from + step;
5265      if (bidi) {
5266        middle = from;
5267        for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
5268      }
5269      var middleX = getX(middle);
5270      if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
5271      else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
5272    }
5273  }
5274
5275  var measureText;
5276  // Compute the default text height.
5277  function textHeight(display) {
5278    if (display.cachedTextHeight != null) return display.cachedTextHeight;
5279    if (measureText == null) {
5280      measureText = elt("pre");
5281      // Measure a bunch of lines, for browsers that compute
5282      // fractional heights.
5283      for (var i = 0; i < 49; ++i) {
5284        measureText.appendChild(document.createTextNode("x"));
5285        measureText.appendChild(elt("br"));
5286      }
5287      measureText.appendChild(document.createTextNode("x"));
5288    }
5289    removeChildrenAndAdd(display.measure, measureText);
5290    var height = measureText.offsetHeight / 50;
5291    if (height > 3) display.cachedTextHeight = height;
5292    removeChildren(display.measure);
5293    return height || 1;
5294  }
5295
5296  // Compute the default character width.
5297  function charWidth(display) {
5298    if (display.cachedCharWidth != null) return display.cachedCharWidth;
5299    var anchor = elt("span", "xxxxxxxxxx");
5300    var pre = elt("pre", [anchor]);
5301    removeChildrenAndAdd(display.measure, pre);
5302    var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
5303    if (width > 2) display.cachedCharWidth = width;
5304    return width || 10;
5305  }
5306
5307  // OPERATIONS
5308
5309  // Operations are used to wrap a series of changes to the editor
5310  // state in such a way that each change won't have to update the
5311  // cursor and display (which would be awkward, slow, and
5312  // error-prone). Instead, display updates are batched and then all
5313  // combined and executed at once.
5314
5315  var operationGroup = null;
5316
5317  var nextOpId = 0;
5318  // Start a new operation.
5319  function startOperation(cm) {
5320    cm.curOp = {
5321      cm: cm,
5322      viewChanged: false,      // Flag that indicates that lines might need to be redrawn
5323      startHeight: cm.doc.height, // Used to detect need to update scrollbar
5324      forceUpdate: false,      // Used to force a redraw
5325      updateInput: null,       // Whether to reset the input textarea
5326      typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
5327      changeObjs: null,        // Accumulated changes, for firing change events
5328      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
5329      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
5330      selectionChanged: false, // Whether the selection needs to be redrawn
5331      updateMaxLine: false,    // Set when the widest line needs to be determined anew
5332      scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
5333      scrollToPos: null,       // Used to scroll to a specific position
5334      focus: false,
5335      id: ++nextOpId           // Unique ID
5336    };
5337    if (operationGroup) {
5338      operationGroup.ops.push(cm.curOp);
5339    } else {
5340      cm.curOp.ownsGroup = operationGroup = {
5341        ops: [cm.curOp],
5342        delayedCallbacks: []
5343      };
5344    }
5345  }
5346
5347  function fireCallbacksForOps(group) {
5348    // Calls delayed callbacks and cursorActivity handlers until no
5349    // new ones appear
5350    var callbacks = group.delayedCallbacks, i = 0;
5351    do {
5352      for (; i < callbacks.length; i++)
5353        callbacks[i].call(null);
5354      for (var j = 0; j < group.ops.length; j++) {
5355        var op = group.ops[j];
5356        if (op.cursorActivityHandlers)
5357          while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
5358            op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
5359      }
5360    } while (i < callbacks.length);
5361  }
5362
5363  // Finish an operation, updating the display and signalling delayed events
5364  function endOperation(cm) {
5365    var op = cm.curOp, group = op.ownsGroup;
5366    if (!group) return;
5367
5368    try { fireCallbacksForOps(group); }
5369    finally {
5370      operationGroup = null;
5371      for (var i = 0; i < group.ops.length; i++)
5372        group.ops[i].cm.curOp = null;
5373      endOperations(group);
5374    }
5375  }
5376
5377  // The DOM updates done when an operation finishes are batched so
5378  // that the minimum number of relayouts are required.
5379  function endOperations(group) {
5380    var ops = group.ops;
5381    for (var i = 0; i < ops.length; i++) // Read DOM
5382      endOperation_R1(ops[i]);
5383    for (var i = 0; i < ops.length; i++) // Write DOM (maybe)
5384      endOperation_W1(ops[i]);
5385    for (var i = 0; i < ops.length; i++) // Read DOM
5386      endOperation_R2(ops[i]);
5387    for (var i = 0; i < ops.length; i++) // Write DOM (maybe)
5388      endOperation_W2(ops[i]);
5389    for (var i = 0; i < ops.length; i++) // Read DOM
5390      endOperation_finish(ops[i]);
5391  }
5392
5393  function endOperation_R1(op) {
5394    var cm = op.cm, display = cm.display;
5395    maybeClipScrollbars(cm);
5396    if (op.updateMaxLine) findMaxLine(cm);
5397
5398    op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
5399      op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
5400                         op.scrollToPos.to.line >= display.viewTo) ||
5401      display.maxLineChanged && cm.options.lineWrapping;
5402    op.update = op.mustUpdate &&
5403      new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
5404  }
5405
5406  function endOperation_W1(op) {
5407    op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
5408  }
5409
5410  function endOperation_R2(op) {
5411    var cm = op.cm, display = cm.display;
5412    if (op.updatedDisplay) updateHeightsInViewport(cm);
5413
5414    op.barMeasure = measureForScrollbars(cm);
5415
5416    // If the max line changed since it was last measured, measure it,
5417    // and ensure the document's width matches it.
5418    // updateDisplay_W2 will use these properties to do the actual resizing
5419    if (display.maxLineChanged && !cm.options.lineWrapping) {
5420      op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
5421      cm.display.sizerWidth = op.adjustWidthTo;
5422      op.barMeasure.scrollWidth =
5423        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
5424      op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
5425    }
5426
5427    if (op.updatedDisplay || op.selectionChanged)
5428      op.preparedSelection = display.input.prepareSelection(op.focus);
5429  }
5430
5431  function endOperation_W2(op) {
5432    var cm = op.cm;
5433
5434    if (op.adjustWidthTo != null) {
5435      cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
5436      if (op.maxScrollLeft < cm.doc.scrollLeft)
5437        setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
5438      cm.display.maxLineChanged = false;
5439    }
5440
5441    var takeFocus = op.focus && op.focus == activeElt() && (!document.hasFocus || document.hasFocus())
5442    if (op.preparedSelection)
5443      cm.display.input.showSelection(op.preparedSelection, takeFocus);
5444    if (op.updatedDisplay || op.startHeight != cm.doc.height)
5445      updateScrollbars(cm, op.barMeasure);
5446    if (op.updatedDisplay)
5447      setDocumentHeight(cm, op.barMeasure);
5448
5449    if (op.selectionChanged) restartBlink(cm);
5450
5451    if (cm.state.focused && op.updateInput)
5452      cm.display.input.reset(op.typing);
5453    if (takeFocus) ensureFocus(op.cm);
5454  }
5455
5456  function endOperation_finish(op) {
5457    var cm = op.cm, display = cm.display, doc = cm.doc;
5458
5459    if (op.updatedDisplay) postUpdateDisplay(cm, op.update);
5460
5461    // Abort mouse wheel delta measurement, when scrolling explicitly
5462    if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
5463      display.wheelStartX = display.wheelStartY = null;
5464
5465    // Propagate the scroll position to the actual DOM scroller
5466    if (op.scrollTop != null && (display.scroller.scrollTop != op.scrollTop || op.forceScroll)) {
5467      doc.scrollTop = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop));
5468      display.scrollbars.setScrollTop(doc.scrollTop);
5469      display.scroller.scrollTop = doc.scrollTop;
5470    }
5471    if (op.scrollLeft != null && (display.scroller.scrollLeft != op.scrollLeft || op.forceScroll)) {
5472      doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - display.scroller.clientWidth, op.scrollLeft));
5473      display.scrollbars.setScrollLeft(doc.scrollLeft);
5474      display.scroller.scrollLeft = doc.scrollLeft;
5475      alignHorizontally(cm);
5476    }
5477    // If we need to scroll a specific position into view, do so.
5478    if (op.scrollToPos) {
5479      var coords = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
5480                                     clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
5481      if (op.scrollToPos.isCursor && cm.state.focused) maybeScrollWindow(cm, coords);
5482    }
5483
5484    // Fire events for markers that are hidden/unidden by editing or
5485    // undoing
5486    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
5487    if (hidden) for (var i = 0; i < hidden.length; ++i)
5488      if (!hidden[i].lines.length) signal(hidden[i], "hide");
5489    if (unhidden) for (var i = 0; i < unhidden.length; ++i)
5490      if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
5491
5492    if (display.wrapper.offsetHeight)
5493      doc.scrollTop = cm.display.scroller.scrollTop;
5494
5495    // Fire change events, and delayed event handlers
5496    if (op.changeObjs)
5497      signal(cm, "changes", cm, op.changeObjs);
5498    if (op.update)
5499      op.update.finish();
5500  }
5501
5502  // Run the given function in an operation
5503  function runInOp(cm, f) {
5504    if (cm.curOp) return f();
5505    startOperation(cm);
5506    try { return f(); }
5507    finally { endOperation(cm); }
5508  }
5509  // Wraps a function in an operation. Returns the wrapped function.
5510  function operation(cm, f) {
5511    return function() {
5512      if (cm.curOp) return f.apply(cm, arguments);
5513      startOperation(cm);
5514      try { return f.apply(cm, arguments); }
5515      finally { endOperation(cm); }
5516    };
5517  }
5518  // Used to add methods to editor and doc instances, wrapping them in
5519  // operations.
5520  function methodOp(f) {
5521    return function() {
5522      if (this.curOp) return f.apply(this, arguments);
5523      startOperation(this);
5524      try { return f.apply(this, arguments); }
5525      finally { endOperation(this); }
5526    };
5527  }
5528  function docMethodOp(f) {
5529    return function() {
5530      var cm = this.cm;
5531      if (!cm || cm.curOp) return f.apply(this, arguments);
5532      startOperation(cm);
5533      try { return f.apply(this, arguments); }
5534      finally { endOperation(cm); }
5535    };
5536  }
5537
5538  // VIEW TRACKING
5539
5540  // These objects are used to represent the visible (currently drawn)
5541  // part of the document. A LineView may correspond to multiple
5542  // logical lines, if those are connected by collapsed ranges.
5543  function LineView(doc, line, lineN) {
5544    // The starting line
5545    this.line = line;
5546    // Continuing lines, if any
5547    this.rest = visualLineContinued(line);
5548    // Number of logical lines in this visual line
5549    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
5550    this.node = this.text = null;
5551    this.hidden = lineIsHidden(doc, line);
5552  }
5553
5554  // Create a range of LineView objects for the given lines.
5555  function buildViewArray(cm, from, to) {
5556    var array = [], nextPos;
5557    for (var pos = from; pos < to; pos = nextPos) {
5558      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
5559      nextPos = pos + view.size;
5560      array.push(view);
5561    }
5562    return array;
5563  }
5564
5565  // Updates the display.view data structure for a given change to the
5566  // document. From and to are in pre-change coordinates. Lendiff is
5567  // the amount of lines added or subtracted by the change. This is
5568  // used for changes that span multiple lines, or change the way
5569  // lines are divided into visual lines. regLineChange (below)
5570  // registers single-line changes.
5571  function regChange(cm, from, to, lendiff) {
5572    if (from == null) from = cm.doc.first;
5573    if (to == null) to = cm.doc.first + cm.doc.size;
5574    if (!lendiff) lendiff = 0;
5575
5576    var display = cm.display;
5577    if (lendiff && to < display.viewTo &&
5578        (display.updateLineNumbers == null || display.updateLineNumbers > from))
5579      display.updateLineNumbers = from;
5580
5581    cm.curOp.viewChanged = true;
5582
5583    if (from >= display.viewTo) { // Change after
5584      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
5585        resetView(cm);
5586    } else if (to <= display.viewFrom) { // Change before
5587      if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
5588        resetView(cm);
5589      } else {
5590        display.viewFrom += lendiff;
5591        display.viewTo += lendiff;
5592      }
5593    } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
5594      resetView(cm);
5595    } else if (from <= display.viewFrom) { // Top overlap
5596      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
5597      if (cut) {
5598        display.view = display.view.slice(cut.index);
5599        display.viewFrom = cut.lineN;
5600        display.viewTo += lendiff;
5601      } else {
5602        resetView(cm);
5603      }
5604    } else if (to >= display.viewTo) { // Bottom overlap
5605      var cut = viewCuttingPoint(cm, from, from, -1);
5606      if (cut) {
5607        display.view = display.view.slice(0, cut.index);
5608        display.viewTo = cut.lineN;
5609      } else {
5610        resetView(cm);
5611      }
5612    } else { // Gap in the middle
5613      var cutTop = viewCuttingPoint(cm, from, from, -1);
5614      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
5615      if (cutTop && cutBot) {
5616        display.view = display.view.slice(0, cutTop.index)
5617          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
5618          .concat(display.view.slice(cutBot.index));
5619        display.viewTo += lendiff;
5620      } else {
5621        resetView(cm);
5622      }
5623    }
5624
5625    var ext = display.externalMeasured;
5626    if (ext) {
5627      if (to < ext.lineN)
5628        ext.lineN += lendiff;
5629      else if (from < ext.lineN + ext.size)
5630        display.externalMeasured = null;
5631    }
5632  }
5633
5634  // Register a change to a single line. Type must be one of "text",
5635  // "gutter", "class", "widget"
5636  function regLineChange(cm, line, type) {
5637    cm.curOp.viewChanged = true;
5638    var display = cm.display, ext = cm.display.externalMeasured;
5639    if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
5640      display.externalMeasured = null;
5641
5642    if (line < display.viewFrom || line >= display.viewTo) return;
5643    var lineView = display.view[findViewIndex(cm, line)];
5644    if (lineView.node == null) return;
5645    var arr = lineView.changes || (lineView.changes = []);
5646    if (indexOf(arr, type) == -1) arr.push(type);
5647  }
5648
5649  // Clear the view.
5650  function resetView(cm) {
5651    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
5652    cm.display.view = [];
5653    cm.display.viewOffset = 0;
5654  }
5655
5656  // Find the view element corresponding to a given line. Return null
5657  // when the line isn't visible.
5658  function findViewIndex(cm, n) {
5659    if (n >= cm.display.viewTo) return null;
5660    n -= cm.display.viewFrom;
5661    if (n < 0) return null;
5662    var view = cm.display.view;
5663    for (var i = 0; i < view.length; i++) {
5664      n -= view[i].size;
5665      if (n < 0) return i;
5666    }
5667  }
5668
5669  function viewCuttingPoint(cm, oldN, newN, dir) {
5670    var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
5671    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
5672      return {index: index, lineN: newN};
5673    for (var i = 0, n = cm.display.viewFrom; i < index; i++)
5674      n += view[i].size;
5675    if (n != oldN) {
5676      if (dir > 0) {
5677        if (index == view.length - 1) return null;
5678        diff = (n + view[index].size) - oldN;
5679        index++;
5680      } else {
5681        diff = n - oldN;
5682      }
5683      oldN += diff; newN += diff;
5684    }
5685    while (visualLineNo(cm.doc, newN) != newN) {
5686      if (index == (dir < 0 ? 0 : view.length - 1)) return null;
5687      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
5688      index += dir;
5689    }
5690    return {index: index, lineN: newN};
5691  }
5692
5693  // Force the view to cover a given range, adding empty view element
5694  // or clipping off existing ones as needed.
5695  function adjustView(cm, from, to) {
5696    var display = cm.display, view = display.view;
5697    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
5698      display.view = buildViewArray(cm, from, to);
5699      display.viewFrom = from;
5700    } else {
5701      if (display.viewFrom > from)
5702        display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
5703      else if (display.viewFrom < from)
5704        display.view = display.view.slice(findViewIndex(cm, from));
5705      display.viewFrom = from;
5706      if (display.viewTo < to)
5707        display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
5708      else if (display.viewTo > to)
5709        display.view = display.view.slice(0, findViewIndex(cm, to));
5710    }
5711    display.viewTo = to;
5712  }
5713
5714  // Count the number of lines in the view whose DOM representation is
5715  // out of date (or nonexistent).
5716  function countDirtyView(cm) {
5717    var view = cm.display.view, dirty = 0;
5718    for (var i = 0; i < view.length; i++) {
5719      var lineView = view[i];
5720      if (!lineView.hidden && (!lineView.node || lineView.changes)) ++dirty;
5721    }
5722    return dirty;
5723  }
5724
5725  // EVENT HANDLERS
5726
5727  // Attach the necessary event handlers when initializing the editor
5728  function registerEventHandlers(cm) {
5729    var d = cm.display;
5730    on(d.scroller, "mousedown", operation(cm, onMouseDown));
5731    // Older IE's will not fire a second mousedown for a double click
5732    if (ie && ie_version < 11)
5733      on(d.scroller, "dblclick", operation(cm, function(e) {
5734        if (signalDOMEvent(cm, e)) return;
5735        var pos = posFromMouse(cm, e);
5736        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
5737        e_preventDefault(e);
5738        var word = cm.findWordAt(pos);
5739        extendSelection(cm.doc, word.anchor, word.head);
5740      }));
5741    else
5742      on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });
5743    // Some browsers fire contextmenu *after* opening the menu, at
5744    // which point we can't mess with it anymore. Context menu is
5745    // handled in onMouseDown for these browsers.
5746    if (!captureRightClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
5747
5748    // Used to suppress mouse event handling when a touch happens
5749    var touchFinished, prevTouch = {end: 0};
5750    function finishTouch() {
5751      if (d.activeTouch) {
5752        touchFinished = setTimeout(function() {d.activeTouch = null;}, 1000);
5753        prevTouch = d.activeTouch;
5754        prevTouch.end = +new Date;
5755      }
5756    };
5757    function isMouseLikeTouchEvent(e) {
5758      if (e.touches.length != 1) return false;
5759      var touch = e.touches[0];
5760      return touch.radiusX <= 1 && touch.radiusY <= 1;
5761    }
5762    function farAway(touch, other) {
5763      if (other.left == null) return true;
5764      var dx = other.left - touch.left, dy = other.top - touch.top;
5765      return dx * dx + dy * dy > 20 * 20;
5766    }
5767    on(d.scroller, "touchstart", function(e) {
5768      if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e)) {
5769        clearTimeout(touchFinished);
5770        var now = +new Date;
5771        d.activeTouch = {start: now, moved: false,
5772                         prev: now - prevTouch.end <= 300 ? prevTouch : null};
5773        if (e.touches.length == 1) {
5774          d.activeTouch.left = e.touches[0].pageX;
5775          d.activeTouch.top = e.touches[0].pageY;
5776        }
5777      }
5778    });
5779    on(d.scroller, "touchmove", function() {
5780      if (d.activeTouch) d.activeTouch.moved = true;
5781    });
5782    on(d.scroller, "touchend", function(e) {
5783      var touch = d.activeTouch;
5784      if (touch && !eventInWidget(d, e) && touch.left != null &&
5785          !touch.moved && new Date - touch.start < 300) {
5786        var pos = cm.coordsChar(d.activeTouch, "page"), range;
5787        if (!touch.prev || farAway(touch, touch.prev)) // Single tap
5788          range = new Range(pos, pos);
5789        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
5790          range = cm.findWordAt(pos);
5791        else // Triple tap
5792          range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
5793        cm.setSelection(range.anchor, range.head);
5794        cm.focus();
5795        e_preventDefault(e);
5796      }
5797      finishTouch();
5798    });
5799    on(d.scroller, "touchcancel", finishTouch);
5800
5801    // Sync scrolling between fake scrollbars and real scrollable
5802    // area, ensure viewport is updated when scrolling.
5803    on(d.scroller, "scroll", function() {
5804      if (d.scroller.clientHeight) {
5805        setScrollTop(cm, d.scroller.scrollTop);
5806        setScrollLeft(cm, d.scroller.scrollLeft, true);
5807        signal(cm, "scroll", cm);
5808      }
5809    });
5810
5811    // Listen to wheel events in order to try and update the viewport on time.
5812    on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
5813    on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
5814
5815    // Prevent wrapper from ever scrolling
5816    on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
5817
5818    d.dragFunctions = {
5819      enter: function(e) {if (!signalDOMEvent(cm, e)) e_stop(e);},
5820      over: function(e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
5821      start: function(e){onDragStart(cm, e);},
5822      drop: operation(cm, onDrop),
5823      leave: function(e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}
5824    };
5825
5826    var inp = d.input.getField();
5827    on(inp, "keyup", function(e) { onKeyUp.call(cm, e); });
5828    on(inp, "keydown", operation(cm, onKeyDown));
5829    on(inp, "keypress", operation(cm, onKeyPress));
5830    on(inp, "focus", bind(onFocus, cm));
5831    on(inp, "blur", bind(onBlur, cm));
5832  }
5833
5834  function dragDropChanged(cm, value, old) {
5835    var wasOn = old && old != CodeMirror.Init;
5836    if (!value != !wasOn) {
5837      var funcs = cm.display.dragFunctions;
5838      var toggle = value ? on : off;
5839      toggle(cm.display.scroller, "dragstart", funcs.start);
5840      toggle(cm.display.scroller, "dragenter", funcs.enter);
5841      toggle(cm.display.scroller, "dragover", funcs.over);
5842      toggle(cm.display.scroller, "dragleave", funcs.leave);
5843      toggle(cm.display.scroller, "drop", funcs.drop);
5844    }
5845  }
5846
5847  // Called when the window resizes
5848  function onResize(cm) {
5849    var d = cm.display;
5850    if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
5851      return;
5852    // Might be a text scaling operation, clear size caches.
5853    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
5854    d.scrollbarsClipped = false;
5855    cm.setSize();
5856  }
5857
5858  // MOUSE EVENTS
5859
5860  // Return true when the given mouse event happened in a widget
5861  function eventInWidget(display, e) {
5862    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
5863      if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
5864          (n.parentNode == display.sizer && n != display.mover))
5865        return true;
5866    }
5867  }
5868
5869  // Given a mouse event, find the corresponding position. If liberal
5870  // is false, it checks whether a gutter or scrollbar was clicked,
5871  // and returns null if it was. forRect is used by rectangular
5872  // selections, and tries to estimate a character position even for
5873  // coordinates beyond the right of the text.
5874  function posFromMouse(cm, e, liberal, forRect) {
5875    var display = cm.display;
5876    if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") return null;
5877
5878    var x, y, space = display.lineSpace.getBoundingClientRect();
5879    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
5880    try { x = e.clientX - space.left; y = e.clientY - space.top; }
5881    catch (e) { return null; }
5882    var coords = coordsChar(cm, x, y), line;
5883    if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
5884      var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
5885      coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
5886    }
5887    return coords;
5888  }
5889
5890  // A mouse down can be a single click, double click, triple click,
5891  // start of selection drag, start of text drag, new cursor
5892  // (ctrl-click), rectangle drag (alt-drag), or xwin
5893  // middle-click-paste. Or it might be a click on something we should
5894  // not interfere with, such as a scrollbar or widget.
5895  function onMouseDown(e) {
5896    var cm = this, display = cm.display;
5897    if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) return;
5898    display.shift = e.shiftKey;
5899
5900    if (eventInWidget(display, e)) {
5901      if (!webkit) {
5902        // Briefly turn off draggability, to allow widgets to do
5903        // normal dragging things.
5904        display.scroller.draggable = false;
5905        setTimeout(function(){display.scroller.draggable = true;}, 100);
5906      }
5907      return;
5908    }
5909    if (clickInGutter(cm, e)) return;
5910    var start = posFromMouse(cm, e);
5911    window.focus();
5912
5913    switch (e_button(e)) {
5914    case 1:
5915      // #3261: make sure, that we're not starting a second selection
5916      if (cm.state.selectingText)
5917        cm.state.selectingText(e);
5918      else if (start)
5919        leftButtonDown(cm, e, start);
5920      else if (e_target(e) == display.scroller)
5921        e_preventDefault(e);
5922      break;
5923    case 2:
5924      if (webkit) cm.state.lastMiddleDown = +new Date;
5925      if (start) extendSelection(cm.doc, start);
5926      setTimeout(function() {display.input.focus();}, 20);
5927      e_preventDefault(e);
5928      break;
5929    case 3:
5930      if (captureRightClick) onContextMenu(cm, e);
5931      else delayBlurEvent(cm);
5932      break;
5933    }
5934  }
5935
5936  var lastClick, lastDoubleClick;
5937  function leftButtonDown(cm, e, start) {
5938    if (ie) setTimeout(bind(ensureFocus, cm), 0);
5939    else cm.curOp.focus = activeElt();
5940
5941    var now = +new Date, type;
5942    if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
5943      type = "triple";
5944    } else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
5945      type = "double";
5946      lastDoubleClick = {time: now, pos: start};
5947    } else {
5948      type = "single";
5949      lastClick = {time: now, pos: start};
5950    }
5951
5952    var sel = cm.doc.sel, modifier = mac ? e.metaKey : e.ctrlKey, contained;
5953    if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
5954        type == "single" && (contained = sel.contains(start)) > -1 &&
5955        (cmp((contained = sel.ranges[contained]).from(), start) < 0 || start.xRel > 0) &&
5956        (cmp(contained.to(), start) > 0 || start.xRel < 0))
5957      leftButtonStartDrag(cm, e, start, modifier);
5958    else
5959      leftButtonSelect(cm, e, start, type, modifier);
5960  }
5961
5962  // Start a text drag. When it ends, see if any dragging actually
5963  // happen, and treat as a click if it didn't.
5964  function leftButtonStartDrag(cm, e, start, modifier) {
5965    var display = cm.display, startTime = +new Date;
5966    var dragEnd = operation(cm, function(e2) {
5967      if (webkit) display.scroller.draggable = false;
5968      cm.state.draggingText = false;
5969      off(document, "mouseup", dragEnd);
5970      off(display.scroller, "drop", dragEnd);
5971      if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
5972        e_preventDefault(e2);
5973        if (!modifier && +new Date - 200 < startTime)
5974          extendSelection(cm.doc, start);
5975        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
5976        if (webkit || ie && ie_version == 9)
5977          setTimeout(function() {document.body.focus(); display.input.focus();}, 20);
5978        else
5979          display.input.focus();
5980      }
5981    });
5982    // Let the drag handler handle this.
5983    if (webkit) display.scroller.draggable = true;
5984    cm.state.draggingText = dragEnd;
5985    // IE's approach to draggable
5986    if (display.scroller.dragDrop) display.scroller.dragDrop();
5987    on(document, "mouseup", dragEnd);
5988    on(display.scroller, "drop", dragEnd);
5989  }
5990
5991  // Normal selection, as opposed to text dragging.
5992  function leftButtonSelect(cm, e, start, type, addNew) {
5993    var display = cm.display, doc = cm.doc;
5994    e_preventDefault(e);
5995
5996    var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
5997    if (addNew && !e.shiftKey) {
5998      ourIndex = doc.sel.contains(start);
5999      if (ourIndex > -1)
6000        ourRange = ranges[ourIndex];
6001      else
6002        ourRange = new Range(start, start);
6003    } else {
6004      ourRange = doc.sel.primary();
6005      ourIndex = doc.sel.primIndex;
6006    }
6007
6008    if (chromeOS ? e.shiftKey && e.metaKey : e.altKey) {
6009      type = "rect";
6010      if (!addNew) ourRange = new Range(start, start);
6011      start = posFromMouse(cm, e, true, true);
6012      ourIndex = -1;
6013    } else if (type == "double") {
6014      var word = cm.findWordAt(start);
6015      if (cm.display.shift || doc.extend)
6016        ourRange = extendRange(doc, ourRange, word.anchor, word.head);
6017      else
6018        ourRange = word;
6019    } else if (type == "triple") {
6020      var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)));
6021      if (cm.display.shift || doc.extend)
6022        ourRange = extendRange(doc, ourRange, line.anchor, line.head);
6023      else
6024        ourRange = line;
6025    } else {
6026      ourRange = extendRange(doc, ourRange, start);
6027    }
6028
6029    if (!addNew) {
6030      ourIndex = 0;
6031      setSelection(doc, new Selection([ourRange], 0), sel_mouse);
6032      startSel = doc.sel;
6033    } else if (ourIndex == -1) {
6034      ourIndex = ranges.length;
6035      setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
6036                   {scroll: false, origin: "*mouse"});
6037    } else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single" && !e.shiftKey) {
6038      setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
6039                   {scroll: false, origin: "*mouse"});
6040      startSel = doc.sel;
6041    } else {
6042      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
6043    }
6044
6045    var lastPos = start;
6046    function extendTo(pos) {
6047      if (cmp(lastPos, pos) == 0) return;
6048      lastPos = pos;
6049
6050      if (type == "rect") {
6051        var ranges = [], tabSize = cm.options.tabSize;
6052        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
6053        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
6054        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
6055        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
6056             line <= end; line++) {
6057          var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
6058          if (left == right)
6059            ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
6060          else if (text.length > leftPos)
6061            ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
6062        }
6063        if (!ranges.length) ranges.push(new Range(start, start));
6064        setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
6065                     {origin: "*mouse", scroll: false});
6066        cm.scrollIntoView(pos);
6067      } else {
6068        var oldRange = ourRange;
6069        var anchor = oldRange.anchor, head = pos;
6070        if (type != "single") {
6071          if (type == "double")
6072            var range = cm.findWordAt(pos);
6073          else
6074            var range = new Range(Pos(pos.line, 0), clipPos(doc, Pos(pos.line + 1, 0)));
6075          if (cmp(range.anchor, anchor) > 0) {
6076            head = range.head;
6077            anchor = minPos(oldRange.from(), range.anchor);
6078          } else {
6079            head = range.anchor;
6080            anchor = maxPos(oldRange.to(), range.head);
6081          }
6082        }
6083        var ranges = startSel.ranges.slice(0);
6084        ranges[ourIndex] = new Range(clipPos(doc, anchor), head);
6085        setSelection(doc, normalizeSelection(ranges, ourIndex), sel_mouse);
6086      }
6087    }
6088
6089    var editorSize = display.wrapper.getBoundingClientRect();
6090    // Used to ensure timeout re-tries don't fire when another extend
6091    // happened in the meantime (clearTimeout isn't reliable -- at
6092    // least on Chrome, the timeouts still happen even when cleared,
6093    // if the clear happens after their scheduled firing time).
6094    var counter = 0;
6095
6096    function extend(e) {
6097      var curCount = ++counter;
6098      var cur = posFromMouse(cm, e, true, type == "rect");
6099      if (!cur) return;
6100      if (cmp(cur, lastPos) != 0) {
6101        cm.curOp.focus = activeElt();
6102        extendTo(cur);
6103        var visible = visibleLines(display, doc);
6104        if (cur.line >= visible.to || cur.line < visible.from)
6105          setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
6106      } else {
6107        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
6108        if (outside) setTimeout(operation(cm, function() {
6109          if (counter != curCount) return;
6110          display.scroller.scrollTop += outside;
6111          extend(e);
6112        }), 50);
6113      }
6114    }
6115
6116    function done(e) {
6117      cm.state.selectingText = false;
6118      counter = Infinity;
6119      e_preventDefault(e);
6120      display.input.focus();
6121      off(document, "mousemove", move);
6122      off(document, "mouseup", up);
6123      doc.history.lastSelOrigin = null;
6124    }
6125
6126    var move = operation(cm, function(e) {
6127      if (!e_button(e)) done(e);
6128      else extend(e);
6129    });
6130    var up = operation(cm, done);
6131    cm.state.selectingText = up;
6132    on(document, "mousemove", move);
6133    on(document, "mouseup", up);
6134  }
6135
6136  // Determines whether an event happened in the gutter, and fires the
6137  // handlers for the corresponding event.
6138  function gutterEvent(cm, e, type, prevent) {
6139    try { var mX = e.clientX, mY = e.clientY; }
6140    catch(e) { return false; }
6141    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) return false;
6142    if (prevent) e_preventDefault(e);
6143
6144    var display = cm.display;
6145    var lineBox = display.lineDiv.getBoundingClientRect();
6146
6147    if (mY > lineBox.bottom || !hasHandler(cm, type)) return e_defaultPrevented(e);
6148    mY -= lineBox.top - display.viewOffset;
6149
6150    for (var i = 0; i < cm.options.gutters.length; ++i) {
6151      var g = display.gutters.childNodes[i];
6152      if (g && g.getBoundingClientRect().right >= mX) {
6153        var line = lineAtHeight(cm.doc, mY);
6154        var gutter = cm.options.gutters[i];
6155        signal(cm, type, cm, line, gutter, e);
6156        return e_defaultPrevented(e);
6157      }
6158    }
6159  }
6160
6161  function clickInGutter(cm, e) {
6162    return gutterEvent(cm, e, "gutterClick", true);
6163  }
6164
6165  // Kludge to work around strange IE behavior where it'll sometimes
6166  // re-fire a series of drag-related events right after the drop (#1551)
6167  var lastDrop = 0;
6168
6169  function onDrop(e) {
6170    var cm = this;
6171    clearDragCursor(cm);
6172    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
6173      return;
6174    e_preventDefault(e);
6175    if (ie) lastDrop = +new Date;
6176    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
6177    if (!pos || cm.isReadOnly()) return;
6178    // Might be a file drop, in which case we simply extract the text
6179    // and insert it.
6180    if (files && files.length && window.FileReader && window.File) {
6181      var n = files.length, text = Array(n), read = 0;
6182      var loadFile = function(file, i) {
6183        if (cm.options.allowDropFileTypes &&
6184            indexOf(cm.options.allowDropFileTypes, file.type) == -1)
6185          return;
6186
6187        var reader = new FileReader;
6188        reader.onload = operation(cm, function() {
6189          var content = reader.result;
6190          if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) content = "";
6191          text[i] = content;
6192          if (++read == n) {
6193            pos = clipPos(cm.doc, pos);
6194            var change = {from: pos, to: pos,
6195                          text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
6196                          origin: "paste"};
6197            makeChange(cm.doc, change);
6198            setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
6199          }
6200        });
6201        reader.readAsText(file);
6202      };
6203      for (var i = 0; i < n; ++i) loadFile(files[i], i);
6204    } else { // Normal drop
6205      // Don't do a replace if the drop happened inside of the selected text.
6206      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
6207        cm.state.draggingText(e);
6208        // Ensure the editor is re-focused
6209        setTimeout(function() {cm.display.input.focus();}, 20);
6210        return;
6211      }
6212      try {
6213        var text = e.dataTransfer.getData("Text");
6214        if (text) {
6215          if (cm.state.draggingText && !(mac ? e.altKey : e.ctrlKey))
6216            var selected = cm.listSelections();
6217          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
6218          if (selected) for (var i = 0; i < selected.length; ++i)
6219            replaceRange(cm.doc, "", selected[i].anchor, selected[i].head, "drag");
6220          cm.replaceSelection(text, "around", "paste");
6221          cm.display.input.focus();
6222        }
6223      }
6224      catch(e){}
6225    }
6226  }
6227
6228  function onDragStart(cm, e) {
6229    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }
6230    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;
6231
6232    e.dataTransfer.setData("Text", cm.getSelection());
6233    e.dataTransfer.effectAllowed = "copyMove"
6234
6235    // Use dummy image instead of default browsers image.
6236    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
6237    if (e.dataTransfer.setDragImage && !safari) {
6238      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
6239      img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
6240      if (presto) {
6241        img.width = img.height = 1;
6242        cm.display.wrapper.appendChild(img);
6243        // Force a relayout, or Opera won't use our image for some obscure reason
6244        img._top = img.offsetTop;
6245      }
6246      e.dataTransfer.setDragImage(img, 0, 0);
6247      if (presto) img.parentNode.removeChild(img);
6248    }
6249  }
6250
6251  function onDragOver(cm, e) {
6252    var pos = posFromMouse(cm, e);
6253    if (!pos) return;
6254    var frag = document.createDocumentFragment();
6255    drawSelectionCursor(cm, pos, frag);
6256    if (!cm.display.dragCursor) {
6257      cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
6258      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
6259    }
6260    removeChildrenAndAdd(cm.display.dragCursor, frag);
6261  }
6262
6263  function clearDragCursor(cm) {
6264    if (cm.display.dragCursor) {
6265      cm.display.lineSpace.removeChild(cm.display.dragCursor);
6266      cm.display.dragCursor = null;
6267    }
6268  }
6269
6270  // SCROLL EVENTS
6271
6272  // Sync the scrollable area and scrollbars, ensure the viewport
6273  // covers the visible area.
6274  function setScrollTop(cm, val) {
6275    if (Math.abs(cm.doc.scrollTop - val) < 2) return;
6276    cm.doc.scrollTop = val;
6277    if (!gecko) updateDisplaySimple(cm, {top: val});
6278    if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
6279    cm.display.scrollbars.setScrollTop(val);
6280    if (gecko) updateDisplaySimple(cm);
6281    startWorker(cm, 100);
6282  }
6283  // Sync scroller and scrollbar, ensure the gutter elements are
6284  // aligned.
6285  function setScrollLeft(cm, val, isScroller) {
6286    if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;
6287    val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
6288    cm.doc.scrollLeft = val;
6289    alignHorizontally(cm);
6290    if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;
6291    cm.display.scrollbars.setScrollLeft(val);
6292  }
6293
6294  // Since the delta values reported on mouse wheel events are
6295  // unstandardized between browsers and even browser versions, and
6296  // generally horribly unpredictable, this code starts by measuring
6297  // the scroll effect that the first few mouse wheel events have,
6298  // and, from that, detects the way it can convert deltas to pixel
6299  // offsets afterwards.
6300  //
6301  // The reason we want to know the amount a wheel event will scroll
6302  // is that it gives us a chance to update the display before the
6303  // actual scrolling happens, reducing flickering.
6304
6305  var wheelSamples = 0, wheelPixelsPerUnit = null;
6306  // Fill in a browser-detected starting value on browsers where we
6307  // know one. These don't have to be accurate -- the result of them
6308  // being wrong would just be a slight flicker on the first wheel
6309  // scroll (if it is large enough).
6310  if (ie) wheelPixelsPerUnit = -.53;
6311  else if (gecko) wheelPixelsPerUnit = 15;
6312  else if (chrome) wheelPixelsPerUnit = -.7;
6313  else if (safari) wheelPixelsPerUnit = -1/3;
6314
6315  var wheelEventDelta = function(e) {
6316    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
6317    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;
6318    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;
6319    else if (dy == null) dy = e.wheelDelta;
6320    return {x: dx, y: dy};
6321  };
6322  CodeMirror.wheelEventPixels = function(e) {
6323    var delta = wheelEventDelta(e);
6324    delta.x *= wheelPixelsPerUnit;
6325    delta.y *= wheelPixelsPerUnit;
6326    return delta;
6327  };
6328
6329  function onScrollWheel(cm, e) {
6330    var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;
6331
6332    var display = cm.display, scroll = display.scroller;
6333    // Quit if there's nothing to scroll here
6334    var canScrollX = scroll.scrollWidth > scroll.clientWidth;
6335    var canScrollY = scroll.scrollHeight > scroll.clientHeight;
6336    if (!(dx && canScrollX || dy && canScrollY)) return;
6337
6338    // Webkit browsers on OS X abort momentum scrolls when the target
6339    // of the scroll event is removed from the scrollable element.
6340    // This hack (see related code in patchDisplay) makes sure the
6341    // element is kept around.
6342    if (dy && mac && webkit) {
6343      outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
6344        for (var i = 0; i < view.length; i++) {
6345          if (view[i].node == cur) {
6346            cm.display.currentWheelTarget = cur;
6347            break outer;
6348          }
6349        }
6350      }
6351    }
6352
6353    // On some browsers, horizontal scrolling will cause redraws to
6354    // happen before the gutter has been realigned, causing it to
6355    // wriggle around in a most unseemly way. When we have an
6356    // estimated pixels/delta value, we just handle horizontal
6357    // scrolling entirely here. It'll be slightly off from native, but
6358    // better than glitching out.
6359    if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
6360      if (dy && canScrollY)
6361        setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
6362      setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
6363      // Only prevent default scrolling if vertical scrolling is
6364      // actually possible. Otherwise, it causes vertical scroll
6365      // jitter on OSX trackpads when deltaX is small and deltaY
6366      // is large (issue #3579)
6367      if (!dy || (dy && canScrollY))
6368        e_preventDefault(e);
6369      display.wheelStartX = null; // Abort measurement, if in progress
6370      return;
6371    }
6372
6373    // 'Project' the visible viewport to cover the area that is being
6374    // scrolled into view (if we know enough to estimate it).
6375    if (dy && wheelPixelsPerUnit != null) {
6376      var pixels = dy * wheelPixelsPerUnit;
6377      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
6378      if (pixels < 0) top = Math.max(0, top + pixels - 50);
6379      else bot = Math.min(cm.doc.height, bot + pixels + 50);
6380      updateDisplaySimple(cm, {top: top, bottom: bot});
6381    }
6382
6383    if (wheelSamples < 20) {
6384      if (display.wheelStartX == null) {
6385        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
6386        display.wheelDX = dx; display.wheelDY = dy;
6387        setTimeout(function() {
6388          if (display.wheelStartX == null) return;
6389          var movedX = scroll.scrollLeft - display.wheelStartX;
6390          var movedY = scroll.scrollTop - display.wheelStartY;
6391          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
6392            (movedX && display.wheelDX && movedX / display.wheelDX);
6393          display.wheelStartX = display.wheelStartY = null;
6394          if (!sample) return;
6395          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
6396          ++wheelSamples;
6397        }, 200);
6398      } else {
6399        display.wheelDX += dx; display.wheelDY += dy;
6400      }
6401    }
6402  }
6403
6404  // KEY EVENTS
6405
6406  // Run a handler that was bound to a key.
6407  function doHandleBinding(cm, bound, dropShift) {
6408    if (typeof bound == "string") {
6409      bound = commands[bound];
6410      if (!bound) return false;
6411    }
6412    // Ensure previous input has been read, so that the handler sees a
6413    // consistent view of the document
6414    cm.display.input.ensurePolled();
6415    var prevShift = cm.display.shift, done = false;
6416    try {
6417      if (cm.isReadOnly()) cm.state.suppressEdits = true;
6418      if (dropShift) cm.display.shift = false;
6419      done = bound(cm) != Pass;
6420    } finally {
6421      cm.display.shift = prevShift;
6422      cm.state.suppressEdits = false;
6423    }
6424    return done;
6425  }
6426
6427  function lookupKeyForEditor(cm, name, handle) {
6428    for (var i = 0; i < cm.state.keyMaps.length; i++) {
6429      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
6430      if (result) return result;
6431    }
6432    return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
6433      || lookupKey(name, cm.options.keyMap, handle, cm);
6434  }
6435
6436  var stopSeq = new Delayed;
6437  function dispatchKey(cm, name, e, handle) {
6438    var seq = cm.state.keySeq;
6439    if (seq) {
6440      if (isModifierKey(name)) return "handled";
6441      stopSeq.set(50, function() {
6442        if (cm.state.keySeq == seq) {
6443          cm.state.keySeq = null;
6444          cm.display.input.reset();
6445        }
6446      });
6447      name = seq + " " + name;
6448    }
6449    var result = lookupKeyForEditor(cm, name, handle);
6450
6451    if (result == "multi")
6452      cm.state.keySeq = name;
6453    if (result == "handled")
6454      signalLater(cm, "keyHandled", cm, name, e);
6455
6456    if (result == "handled" || result == "multi") {
6457      e_preventDefault(e);
6458      restartBlink(cm);
6459    }
6460
6461    if (seq && !result && /\'$/.test(name)) {
6462      e_preventDefault(e);
6463      return true;
6464    }
6465    return !!result;
6466  }
6467
6468  // Handle a key from the keydown event.
6469  function handleKeyBinding(cm, e) {
6470    var name = keyName(e, true);
6471    if (!name) return false;
6472
6473    if (e.shiftKey && !cm.state.keySeq) {
6474      // First try to resolve full name (including 'Shift-'). Failing
6475      // that, see if there is a cursor-motion command (starting with
6476      // 'go') bound to the keyname without 'Shift-'.
6477      return dispatchKey(cm, "Shift-" + name, e, function(b) {return doHandleBinding(cm, b, true);})
6478          || dispatchKey(cm, name, e, function(b) {
6479               if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
6480                 return doHandleBinding(cm, b);
6481             });
6482    } else {
6483      return dispatchKey(cm, name, e, function(b) { return doHandleBinding(cm, b); });
6484    }
6485  }
6486
6487  // Handle a key from the keypress event
6488  function handleCharBinding(cm, e, ch) {
6489    return dispatchKey(cm, "'" + ch + "'", e,
6490                       function(b) { return doHandleBinding(cm, b, true); });
6491  }
6492
6493  var lastStoppedKey = null;
6494  function onKeyDown(e) {
6495    var cm = this;
6496    cm.curOp.focus = activeElt();
6497    if (signalDOMEvent(cm, e)) return;
6498    // IE does strange things with escape.
6499    if (ie && ie_version < 11 && e.keyCode == 27) e.returnValue = false;
6500    var code = e.keyCode;
6501    cm.display.shift = code == 16 || e.shiftKey;
6502    var handled = handleKeyBinding(cm, e);
6503    if (presto) {
6504      lastStoppedKey = handled ? code : null;
6505      // Opera has no cut event... we try to at least catch the key combo
6506      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
6507        cm.replaceSelection("", null, "cut");
6508    }
6509
6510    // Turn mouse into crosshair when Alt is held on Mac.
6511    if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
6512      showCrossHair(cm);
6513  }
6514
6515  function showCrossHair(cm) {
6516    var lineDiv = cm.display.lineDiv;
6517    addClass(lineDiv, "CodeMirror-crosshair");
6518
6519    function up(e) {
6520      if (e.keyCode == 18 || !e.altKey) {
6521        rmClass(lineDiv, "CodeMirror-crosshair");
6522        off(document, "keyup", up);
6523        off(document, "mouseover", up);
6524      }
6525    }
6526    on(document, "keyup", up);
6527    on(document, "mouseover", up);
6528  }
6529
6530  function onKeyUp(e) {
6531    if (e.keyCode == 16) this.doc.sel.shift = false;
6532    signalDOMEvent(this, e);
6533  }
6534
6535  function onKeyPress(e) {
6536    var cm = this;
6537    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) return;
6538    var keyCode = e.keyCode, charCode = e.charCode;
6539    if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
6540    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) return;
6541    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
6542    if (handleCharBinding(cm, e, ch)) return;
6543    cm.display.input.onKeyPress(e);
6544  }
6545
6546  // FOCUS/BLUR EVENTS
6547
6548  function delayBlurEvent(cm) {
6549    cm.state.delayingBlurEvent = true;
6550    setTimeout(function() {
6551      if (cm.state.delayingBlurEvent) {
6552        cm.state.delayingBlurEvent = false;
6553        onBlur(cm);
6554      }
6555    }, 100);
6556  }
6557
6558  function onFocus(cm) {
6559    if (cm.state.delayingBlurEvent) cm.state.delayingBlurEvent = false;
6560
6561    if (cm.options.readOnly == "nocursor") return;
6562    if (!cm.state.focused) {
6563      signal(cm, "focus", cm);
6564      cm.state.focused = true;
6565      addClass(cm.display.wrapper, "CodeMirror-focused");
6566      // This test prevents this from firing when a context
6567      // menu is closed (since the input reset would kill the
6568      // select-all detection hack)
6569      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
6570        cm.display.input.reset();
6571        if (webkit) setTimeout(function() { cm.display.input.reset(true); }, 20); // Issue #1730
6572      }
6573      cm.display.input.receivedFocus();
6574    }
6575    restartBlink(cm);
6576  }
6577  function onBlur(cm) {
6578    if (cm.state.delayingBlurEvent) return;
6579
6580    if (cm.state.focused) {
6581      signal(cm, "blur", cm);
6582      cm.state.focused = false;
6583      rmClass(cm.display.wrapper, "CodeMirror-focused");
6584    }
6585    clearInterval(cm.display.blinker);
6586    setTimeout(function() {if (!cm.state.focused) cm.display.shift = false;}, 150);
6587  }
6588
6589  // CONTEXT MENU HANDLING
6590
6591  // To make the context menu work, we need to briefly unhide the
6592  // textarea (making it as unobtrusive as possible) to let the
6593  // right-click take effect on it.
6594  function onContextMenu(cm, e) {
6595    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) return;
6596    if (signalDOMEvent(cm, e, "contextmenu")) return;
6597    cm.display.input.onContextMenu(e);
6598  }
6599
6600  function contextMenuInGutter(cm, e) {
6601    if (!hasHandler(cm, "gutterContextMenu")) return false;
6602    return gutterEvent(cm, e, "gutterContextMenu", false);
6603  }
6604
6605  // UPDATING
6606
6607  // Compute the position of the end of a change (its 'to' property
6608  // refers to the pre-change end).
6609  var changeEnd = CodeMirror.changeEnd = function(change) {
6610    if (!change.text) return change.to;
6611    return Pos(change.from.line + change.text.length - 1,
6612               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
6613  };
6614
6615  // Adjust a position to refer to the post-change position of the
6616  // same text, or the end of the change if the change covers it.
6617  function adjustForChange(pos, change) {
6618    if (cmp(pos, change.from) < 0) return pos;
6619    if (cmp(pos, change.to) <= 0) return changeEnd(change);
6620
6621    var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
6622    if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch;
6623    return Pos(line, ch);
6624  }
6625
6626  function computeSelAfterChange(doc, change) {
6627    var out = [];
6628    for (var i = 0; i < doc.sel.ranges.length; i++) {
6629      var range = doc.sel.ranges[i];
6630      out.push(new Range(adjustForChange(range.anchor, change),
6631                         adjustForChange(range.head, change)));
6632    }
6633    return normalizeSelection(out, doc.sel.primIndex);
6634  }
6635
6636  function offsetPos(pos, old, nw) {
6637    if (pos.line == old.line)
6638      return Pos(nw.line, pos.ch - old.ch + nw.ch);
6639    else
6640      return Pos(nw.line + (pos.line - old.line), pos.ch);
6641  }
6642
6643  // Used by replaceSelections to allow moving the selection to the
6644  // start or around the replaced test. Hint may be "start" or "around".
6645  function computeReplacedSel(doc, changes, hint) {
6646    var out = [];
6647    var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
6648    for (var i = 0; i < changes.length; i++) {
6649      var change = changes[i];
6650      var from = offsetPos(change.from, oldPrev, newPrev);
6651      var to = offsetPos(changeEnd(change), oldPrev, newPrev);
6652      oldPrev = change.to;
6653      newPrev = to;
6654      if (hint == "around") {
6655        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
6656        out[i] = new Range(inv ? to : from, inv ? from : to);
6657      } else {
6658        out[i] = new Range(from, from);
6659      }
6660    }
6661    return new Selection(out, doc.sel.primIndex);
6662  }
6663
6664  // Allow "beforeChange" event handlers to influence a change
6665  function filterChange(doc, change, update) {
6666    var obj = {
6667      canceled: false,
6668      from: change.from,
6669      to: change.to,
6670      text: change.text,
6671      origin: change.origin,
6672      cancel: function() { this.canceled = true; }
6673    };
6674    if (update) obj.update = function(from, to, text, origin) {
6675      if (from) this.from = clipPos(doc, from);
6676      if (to) this.to = clipPos(doc, to);
6677      if (text) this.text = text;
6678      if (origin !== undefined) this.origin = origin;
6679    };
6680    signal(doc, "beforeChange", doc, obj);
6681    if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);
6682
6683    if (obj.canceled) return null;
6684    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};
6685  }
6686
6687  // Apply a change to a document, and add it to the document's
6688  // history, and propagating it to all linked documents.
6689  function makeChange(doc, change, ignoreReadOnly) {
6690    if (doc.cm) {
6691      if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly);
6692      if (doc.cm.state.suppressEdits) return;
6693    }
6694
6695    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
6696      change = filterChange(doc, change, true);
6697      if (!change) return;
6698    }
6699
6700    // Possibly split or suppress the update based on the presence
6701    // of read-only spans in its range.
6702    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
6703    if (split) {
6704      for (var i = split.length - 1; i >= 0; --i)
6705        makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text});
6706    } else {
6707      makeChangeInner(doc, change);
6708    }
6709  }
6710
6711  function makeChangeInner(doc, change) {
6712    if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) return;
6713    var selAfter = computeSelAfterChange(doc, change);
6714    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
6715
6716    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
6717    var rebased = [];
6718
6719    linkedDocs(doc, function(doc, sharedHist) {
6720      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
6721        rebaseHist(doc.history, change);
6722        rebased.push(doc.history);
6723      }
6724      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
6725    });
6726  }
6727
6728  // Revert a change stored in a document's history.
6729  function makeChangeFromHistory(doc, type, allowSelectionOnly) {
6730    if (doc.cm && doc.cm.state.suppressEdits) return;
6731
6732    var hist = doc.history, event, selAfter = doc.sel;
6733    var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;
6734
6735    // Verify that there is a useable event (so that ctrl-z won't
6736    // needlessly clear selection events)
6737    for (var i = 0; i < source.length; i++) {
6738      event = source[i];
6739      if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
6740        break;
6741    }
6742    if (i == source.length) return;
6743    hist.lastOrigin = hist.lastSelOrigin = null;
6744
6745    for (;;) {
6746      event = source.pop();
6747      if (event.ranges) {
6748        pushSelectionToHistory(event, dest);
6749        if (allowSelectionOnly && !event.equals(doc.sel)) {
6750          setSelection(doc, event, {clearRedo: false});
6751          return;
6752        }
6753        selAfter = event;
6754      }
6755      else break;
6756    }
6757
6758    // Build up a reverse change object to add to the opposite history
6759    // stack (redo when undoing, and vice versa).
6760    var antiChanges = [];
6761    pushSelectionToHistory(selAfter, dest);
6762    dest.push({changes: antiChanges, generation: hist.generation});
6763    hist.generation = event.generation || ++hist.maxGeneration;
6764
6765    var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
6766
6767    for (var i = event.changes.length - 1; i >= 0; --i) {
6768      var change = event.changes[i];
6769      change.origin = type;
6770      if (filter && !filterChange(doc, change, false)) {
6771        source.length = 0;
6772        return;
6773      }
6774
6775      antiChanges.push(historyChangeFromChange(doc, change));
6776
6777      var after = i ? computeSelAfterChange(doc, change) : lst(source);
6778      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
6779      if (!i && doc.cm) doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)});
6780      var rebased = [];
6781
6782      // Propagate to the linked documents
6783      linkedDocs(doc, function(doc, sharedHist) {
6784        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
6785          rebaseHist(doc.history, change);
6786          rebased.push(doc.history);
6787        }
6788        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
6789      });
6790    }
6791  }
6792
6793  // Sub-default need their line numbers shifted when text is added
6794  // above or below them in the parent document.
6795  function shiftDoc(doc, distance) {
6796    if (distance == 0) return;
6797    doc.first += distance;
6798    doc.sel = new Selection(map(doc.sel.ranges, function(range) {
6799      return new Range(Pos(range.anchor.line + distance, range.anchor.ch),
6800                       Pos(range.head.line + distance, range.head.ch));
6801    }), doc.sel.primIndex);
6802    if (doc.cm) {
6803      regChange(doc.cm, doc.first, doc.first - distance, distance);
6804      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
6805        regLineChange(doc.cm, l, "gutter");
6806    }
6807  }
6808
6809  // More lower-level change function, handling only a single document
6810  // (not linked ones).
6811  function makeChangeSingleDoc(doc, change, selAfter, spans) {
6812    if (doc.cm && !doc.cm.curOp)
6813      return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
6814
6815    if (change.to.line < doc.first) {
6816      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
6817      return;
6818    }
6819    if (change.from.line > doc.lastLine()) return;
6820
6821    // Clip the change to the size of this doc
6822    if (change.from.line < doc.first) {
6823      var shift = change.text.length - 1 - (doc.first - change.from.line);
6824      shiftDoc(doc, shift);
6825      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
6826                text: [lst(change.text)], origin: change.origin};
6827    }
6828    var last = doc.lastLine();
6829    if (change.to.line > last) {
6830      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
6831                text: [change.text[0]], origin: change.origin};
6832    }
6833
6834    change.removed = getBetween(doc, change.from, change.to);
6835
6836    if (!selAfter) selAfter = computeSelAfterChange(doc, change);
6837    if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans);
6838    else updateDoc(doc, change, spans);
6839    setSelectionNoUndo(doc, selAfter, sel_dontScroll);
6840  }
6841
6842  // Handle the interaction of a change to a document with the editor
6843  // that this document is part of.
6844  function makeChangeSingleDocInEditor(cm, change, spans) {
6845    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
6846
6847    var recomputeMaxLength = false, checkWidthStart = from.line;
6848    if (!cm.options.lineWrapping) {
6849      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
6850      doc.iter(checkWidthStart, to.line + 1, function(line) {
6851        if (line == display.maxLine) {
6852          recomputeMaxLength = true;
6853          return true;
6854        }
6855      });
6856    }
6857
6858    if (doc.sel.contains(change.from, change.to) > -1)
6859      signalCursorActivity(cm);
6860
6861    updateDoc(doc, change, spans, estimateHeight(cm));
6862
6863    if (!cm.options.lineWrapping) {
6864      doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
6865        var len = lineLength(line);
6866        if (len > display.maxLineLength) {
6867          display.maxLine = line;
6868          display.maxLineLength = len;
6869          display.maxLineChanged = true;
6870          recomputeMaxLength = false;
6871        }
6872      });
6873      if (recomputeMaxLength) cm.curOp.updateMaxLine = true;
6874    }
6875
6876    // Adjust frontier, schedule worker
6877    doc.frontier = Math.min(doc.frontier, from.line);
6878    startWorker(cm, 400);
6879
6880    var lendiff = change.text.length - (to.line - from.line) - 1;
6881    // Remember that these lines changed, for updating the display
6882    if (change.full)
6883      regChange(cm);
6884    else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
6885      regLineChange(cm, from.line, "text");
6886    else
6887      regChange(cm, from.line, to.line + 1, lendiff);
6888
6889    var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
6890    if (changeHandler || changesHandler) {
6891      var obj = {
6892        from: from, to: to,
6893        text: change.text,
6894        removed: change.removed,
6895        origin: change.origin
6896      };
6897      if (changeHandler) signalLater(cm, "change", cm, obj);
6898      if (changesHandler) (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
6899    }
6900    cm.display.selForContextMenu = null;
6901  }
6902
6903  function replaceRange(doc, code, from, to, origin) {
6904    if (!to) to = from;
6905    if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp; }
6906    if (typeof code == "string") code = doc.splitLines(code);
6907    makeChange(doc, {from: from, to: to, text: code, origin: origin});
6908  }
6909
6910  // SCROLLING THINGS INTO VIEW
6911
6912  // If an editor sits on the top or bottom of the window, partially
6913  // scrolled out of view, this ensures that the cursor is visible.
6914  function maybeScrollWindow(cm, coords) {
6915    if (signalDOMEvent(cm, "scrollCursorIntoView")) return;
6916
6917    var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
6918    if (coords.top + box.top < 0) doScroll = true;
6919    else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
6920    if (doScroll != null && !phantom) {
6921      var scrollNode = elt("div", "\u200b", null, "position: absolute; top: " +
6922                           (coords.top - display.viewOffset - paddingTop(cm.display)) + "px; height: " +
6923                           (coords.bottom - coords.top + scrollGap(cm) + display.barHeight) + "px; left: " +
6924                           coords.left + "px; width: 2px;");
6925      cm.display.lineSpace.appendChild(scrollNode);
6926      scrollNode.scrollIntoView(doScroll);
6927      cm.display.lineSpace.removeChild(scrollNode);
6928    }
6929  }
6930
6931  // Scroll a given position into view (immediately), verifying that
6932  // it actually became visible (as line heights are accurately
6933  // measured, the position of something may 'drift' during drawing).
6934  function scrollPosIntoView(cm, pos, end, margin) {
6935    if (margin == null) margin = 0;
6936    for (var limit = 0; limit < 5; limit++) {
6937      var changed = false, coords = cursorCoords(cm, pos);
6938      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
6939      var scrollPos = calculateScrollPos(cm, Math.min(coords.left, endCoords.left),
6940                                         Math.min(coords.top, endCoords.top) - margin,
6941                                         Math.max(coords.left, endCoords.left),
6942                                         Math.max(coords.bottom, endCoords.bottom) + margin);
6943      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
6944      if (scrollPos.scrollTop != null) {
6945        setScrollTop(cm, scrollPos.scrollTop);
6946        if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;
6947      }
6948      if (scrollPos.scrollLeft != null) {
6949        setScrollLeft(cm, scrollPos.scrollLeft);
6950        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;
6951      }
6952      if (!changed) break;
6953    }
6954    return coords;
6955  }
6956
6957  // Scroll a given set of coordinates into view (immediately).
6958  function scrollIntoView(cm, x1, y1, x2, y2) {
6959    var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
6960    if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);
6961    if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);
6962  }
6963
6964  // Calculate a new scroll position needed to scroll the given
6965  // rectangle into view. Returns an object with scrollTop and
6966  // scrollLeft properties. When these are undefined, the
6967  // vertical/horizontal position does not need to be adjusted.
6968  function calculateScrollPos(cm, x1, y1, x2, y2) {
6969    var display = cm.display, snapMargin = textHeight(cm.display);
6970    if (y1 < 0) y1 = 0;
6971    var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
6972    var screen = displayHeight(cm), result = {};
6973    if (y2 - y1 > screen) y2 = y1 + screen;
6974    var docBottom = cm.doc.height + paddingVert(display);
6975    var atTop = y1 < snapMargin, atBottom = y2 > docBottom - snapMargin;
6976    if (y1 < screentop) {
6977      result.scrollTop = atTop ? 0 : y1;
6978    } else if (y2 > screentop + screen) {
6979      var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);
6980      if (newTop != screentop) result.scrollTop = newTop;
6981    }
6982
6983    var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
6984    var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
6985    var tooWide = x2 - x1 > screenw;
6986    if (tooWide) x2 = x1 + screenw;
6987    if (x1 < 10)
6988      result.scrollLeft = 0;
6989    else if (x1 < screenleft)
6990      result.scrollLeft = Math.max(0, x1 - (tooWide ? 0 : 10));
6991    else if (x2 > screenw + screenleft - 3)
6992      result.scrollLeft = x2 + (tooWide ? 0 : 10) - screenw;
6993    return result;
6994  }
6995
6996  // Store a relative adjustment to the scroll position in the current
6997  // operation (to be applied when the operation finishes).
6998  function addToScrollPos(cm, left, top) {
6999    if (left != null || top != null) resolveScrollToPos(cm);
7000    if (left != null)
7001      cm.curOp.scrollLeft = (cm.curOp.scrollLeft == null ? cm.doc.scrollLeft : cm.curOp.scrollLeft) + left;
7002    if (top != null)
7003      cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
7004  }
7005
7006  // Make sure that at the end of the operation the current cursor is
7007  // shown.
7008  function ensureCursorVisible(cm) {
7009    resolveScrollToPos(cm);
7010    var cur = cm.getCursor(), from = cur, to = cur;
7011    if (!cm.options.lineWrapping) {
7012      from = cur.ch ? Pos(cur.line, cur.ch - 1) : cur;
7013      to = Pos(cur.line, cur.ch + 1);
7014    }
7015    cm.curOp.scrollToPos = {from: from, to: to, margin: cm.options.cursorScrollMargin, isCursor: true};
7016  }
7017
7018  // When an operation has its scrollToPos property set, and another
7019  // scroll action is applied before the end of the operation, this
7020  // 'simulates' scrolling that position into view in a cheap way, so
7021  // that the effect of intermediate scroll commands is not ignored.
7022  function resolveScrollToPos(cm) {
7023    var range = cm.curOp.scrollToPos;
7024    if (range) {
7025      cm.curOp.scrollToPos = null;
7026      var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
7027      var sPos = calculateScrollPos(cm, Math.min(from.left, to.left),
7028                                    Math.min(from.top, to.top) - range.margin,
7029                                    Math.max(from.right, to.right),
7030                                    Math.max(from.bottom, to.bottom) + range.margin);
7031      cm.scrollTo(sPos.scrollLeft, sPos.scrollTop);
7032    }
7033  }
7034
7035  // API UTILITIES
7036
7037  // Indent the given line. The how parameter can be "smart",
7038  // "add"/null, "subtract", or "prev". When aggressive is false
7039  // (typically set to true for forced single-line indents), empty
7040  // lines are not indented, and places where the mode returns Pass
7041  // are left alone.
7042  function indentLine(cm, n, how, aggressive) {
7043    var doc = cm.doc, state;
7044    if (how == null) how = "add";
7045    if (how == "smart") {
7046      // Fall back to "prev" when the mode doesn't have an indentation
7047      // method.
7048      if (!doc.mode.indent) how = "prev";
7049      else state = getStateBefore(cm, n);
7050    }
7051
7052    var tabSize = cm.options.tabSize;
7053    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
7054    if (line.stateAfter) line.stateAfter = null;
7055    var curSpaceString = line.text.match(/^\s*/)[0], indentation;
7056    if (!aggressive && !/\S/.test(line.text)) {
7057      indentation = 0;
7058      how = "not";
7059    } else if (how == "smart") {
7060      indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
7061      if (indentation == Pass || indentation > 150) {
7062        if (!aggressive) return;
7063        how = "prev";
7064      }
7065    }
7066    if (how == "prev") {
7067      if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);
7068      else indentation = 0;
7069    } else if (how == "add") {
7070      indentation = curSpace + cm.options.indentUnit;
7071    } else if (how == "subtract") {
7072      indentation = curSpace - cm.options.indentUnit;
7073    } else if (typeof how == "number") {
7074      indentation = curSpace + how;
7075    }
7076    indentation = Math.max(0, indentation);
7077
7078    var indentString = "", pos = 0;
7079    if (cm.options.indentWithTabs)
7080      for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
7081    if (pos < indentation) indentString += spaceStr(indentation - pos);
7082
7083    if (indentString != curSpaceString) {
7084      replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
7085      line.stateAfter = null;
7086      return true;
7087    } else {
7088      // Ensure that, if the cursor was in the whitespace at the start
7089      // of the line, it is moved to the end of that space.
7090      for (var i = 0; i < doc.sel.ranges.length; i++) {
7091        var range = doc.sel.ranges[i];
7092        if (range.head.line == n && range.head.ch < curSpaceString.length) {
7093          var pos = Pos(n, curSpaceString.length);
7094          replaceOneSelection(doc, i, new Range(pos, pos));
7095          break;
7096        }
7097      }
7098    }
7099  }
7100
7101  // Utility for applying a change to a line by handle or number,
7102  // returning the number and optionally registering the line as
7103  // changed.
7104  function changeLine(doc, handle, changeType, op) {
7105    var no = handle, line = handle;
7106    if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
7107    else no = lineNo(handle);
7108    if (no == null) return null;
7109    if (op(line, no) && doc.cm) regLineChange(doc.cm, no, changeType);
7110    return line;
7111  }
7112
7113  // Helper for deleting text near the selection(s), used to implement
7114  // backspace, delete, and similar functionality.
7115  function deleteNearSelection(cm, compute) {
7116    var ranges = cm.doc.sel.ranges, kill = [];
7117    // Build up a set of ranges to kill first, merging overlapping
7118    // ranges.
7119    for (var i = 0; i < ranges.length; i++) {
7120      var toKill = compute(ranges[i]);
7121      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
7122        var replaced = kill.pop();
7123        if (cmp(replaced.from, toKill.from) < 0) {
7124          toKill.from = replaced.from;
7125          break;
7126        }
7127      }
7128      kill.push(toKill);
7129    }
7130    // Next, remove those actual ranges.
7131    runInOp(cm, function() {
7132      for (var i = kill.length - 1; i >= 0; i--)
7133        replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
7134      ensureCursorVisible(cm);
7135    });
7136  }
7137
7138  // Used for horizontal relative motion. Dir is -1 or 1 (left or
7139  // right), unit can be "char", "column" (like char, but doesn't
7140  // cross line boundaries), "word" (across next word), or "group" (to
7141  // the start of next group of word or non-word-non-whitespace
7142  // chars). The visually param controls whether, in right-to-left
7143  // text, direction 1 means to move towards the next index in the
7144  // string, or towards the character to the right of the current
7145  // position. The resulting position will have a hitSide=true
7146  // property if it reached the end of the document.
7147  function findPosH(doc, pos, dir, unit, visually) {
7148    var line = pos.line, ch = pos.ch, origDir = dir;
7149    var lineObj = getLine(doc, line);
7150    function findNextLine() {
7151      var l = line + dir;
7152      if (l < doc.first || l >= doc.first + doc.size) return false
7153      line = l;
7154      return lineObj = getLine(doc, l);
7155    }
7156    function moveOnce(boundToLine) {
7157      var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
7158      if (next == null) {
7159        if (!boundToLine && findNextLine()) {
7160          if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
7161          else ch = dir < 0 ? lineObj.text.length : 0;
7162        } else return false
7163      } else ch = next;
7164      return true;
7165    }
7166
7167    if (unit == "char") {
7168      moveOnce()
7169    } else if (unit == "column") {
7170      moveOnce(true)
7171    } else if (unit == "word" || unit == "group") {
7172      var sawType = null, group = unit == "group";
7173      var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
7174      for (var first = true;; first = false) {
7175        if (dir < 0 && !moveOnce(!first)) break;
7176        var cur = lineObj.text.charAt(ch) || "\n";
7177        var type = isWordChar(cur, helper) ? "w"
7178          : group && cur == "\n" ? "n"
7179          : !group || /\s/.test(cur) ? null
7180          : "p";
7181        if (group && !first && !type) type = "s";
7182        if (sawType && sawType != type) {
7183          if (dir < 0) {dir = 1; moveOnce();}
7184          break;
7185        }
7186
7187        if (type) sawType = type;
7188        if (dir > 0 && !moveOnce(!first)) break;
7189      }
7190    }
7191    var result = skipAtomic(doc, Pos(line, ch), pos, origDir, true);
7192    if (!cmp(pos, result)) result.hitSide = true;
7193    return result;
7194  }
7195
7196  // For relative vertical movement. Dir may be -1 or 1. Unit can be
7197  // "page" or "line". The resulting position will have a hitSide=true
7198  // property if it reached the end of the document.
7199  function findPosV(cm, pos, dir, unit) {
7200    var doc = cm.doc, x = pos.left, y;
7201    if (unit == "page") {
7202      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
7203      y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));
7204    } else if (unit == "line") {
7205      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
7206    }
7207    for (;;) {
7208      var target = coordsChar(cm, x, y);
7209      if (!target.outside) break;
7210      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }
7211      y += dir * 5;
7212    }
7213    return target;
7214  }
7215
7216  // EDITOR METHODS
7217
7218  // The publicly visible API. Note that methodOp(f) means
7219  // 'wrap f in an operation, performed on its `this` parameter'.
7220
7221  // This is not the complete set of editor methods. Most of the
7222  // methods defined on the Doc type are also injected into
7223  // CodeMirror.prototype, for backwards compatibility and
7224  // convenience.
7225
7226  CodeMirror.prototype = {
7227    constructor: CodeMirror,
7228    focus: function(){window.focus(); this.display.input.focus();},
7229
7230    setOption: function(option, value) {
7231      var options = this.options, old = options[option];
7232      if (options[option] == value && option != "mode") return;
7233      options[option] = value;
7234      if (optionHandlers.hasOwnProperty(option))
7235        operation(this, optionHandlers[option])(this, value, old);
7236    },
7237
7238    getOption: function(option) {return this.options[option];},
7239    getDoc: function() {return this.doc;},
7240
7241    addKeyMap: function(map, bottom) {
7242      this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
7243    },
7244    removeKeyMap: function(map) {
7245      var maps = this.state.keyMaps;
7246      for (var i = 0; i < maps.length; ++i)
7247        if (maps[i] == map || maps[i].name == map) {
7248          maps.splice(i, 1);
7249          return true;
7250        }
7251    },
7252
7253    addOverlay: methodOp(function(spec, options) {
7254      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
7255      if (mode.startState) throw new Error("Overlays may not be stateful.");
7256      this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});
7257      this.state.modeGen++;
7258      regChange(this);
7259    }),
7260    removeOverlay: methodOp(function(spec) {
7261      var overlays = this.state.overlays;
7262      for (var i = 0; i < overlays.length; ++i) {
7263        var cur = overlays[i].modeSpec;
7264        if (cur == spec || typeof spec == "string" && cur.name == spec) {
7265          overlays.splice(i, 1);
7266          this.state.modeGen++;
7267          regChange(this);
7268          return;
7269        }
7270      }
7271    }),
7272
7273    indentLine: methodOp(function(n, dir, aggressive) {
7274      if (typeof dir != "string" && typeof dir != "number") {
7275        if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";
7276        else dir = dir ? "add" : "subtract";
7277      }
7278      if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);
7279    }),
7280    indentSelection: methodOp(function(how) {
7281      var ranges = this.doc.sel.ranges, end = -1;
7282      for (var i = 0; i < ranges.length; i++) {
7283        var range = ranges[i];
7284        if (!range.empty()) {
7285          var from = range.from(), to = range.to();
7286          var start = Math.max(end, from.line);
7287          end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
7288          for (var j = start; j < end; ++j)
7289            indentLine(this, j, how);
7290          var newRanges = this.doc.sel.ranges;
7291          if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
7292            replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
7293        } else if (range.head.line > end) {
7294          indentLine(this, range.head.line, how, true);
7295          end = range.head.line;
7296          if (i == this.doc.sel.primIndex) ensureCursorVisible(this);
7297        }
7298      }
7299    }),
7300
7301    // Fetch the parser token for a given character. Useful for hacks
7302    // that want to inspect the mode state (say, for completion).
7303    getTokenAt: function(pos, precise) {
7304      return takeToken(this, pos, precise);
7305    },
7306
7307    getLineTokens: function(line, precise) {
7308      return takeToken(this, Pos(line), precise, true);
7309    },
7310
7311    getTokenTypeAt: function(pos) {
7312      pos = clipPos(this.doc, pos);
7313      var styles = getLineStyles(this, getLine(this.doc, pos.line));
7314      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
7315      var type;
7316      if (ch == 0) type = styles[2];
7317      else for (;;) {
7318        var mid = (before + after) >> 1;
7319        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) after = mid;
7320        else if (styles[mid * 2 + 1] < ch) before = mid + 1;
7321        else { type = styles[mid * 2 + 2]; break; }
7322      }
7323      var cut = type ? type.indexOf("cm-overlay ") : -1;
7324      return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1);
7325    },
7326
7327    getModeAt: function(pos) {
7328      var mode = this.doc.mode;
7329      if (!mode.innerMode) return mode;
7330      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
7331    },
7332
7333    getHelper: function(pos, type) {
7334      return this.getHelpers(pos, type)[0];
7335    },
7336
7337    getHelpers: function(pos, type) {
7338      var found = [];
7339      if (!helpers.hasOwnProperty(type)) return found;
7340      var help = helpers[type], mode = this.getModeAt(pos);
7341      if (typeof mode[type] == "string") {
7342        if (help[mode[type]]) found.push(help[mode[type]]);
7343      } else if (mode[type]) {
7344        for (var i = 0; i < mode[type].length; i++) {
7345          var val = help[mode[type][i]];
7346          if (val) found.push(val);
7347        }
7348      } else if (mode.helperType && help[mode.helperType]) {
7349        found.push(help[mode.helperType]);
7350      } else if (help[mode.name]) {
7351        found.push(help[mode.name]);
7352      }
7353      for (var i = 0; i < help._global.length; i++) {
7354        var cur = help._global[i];
7355        if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
7356          found.push(cur.val);
7357      }
7358      return found;
7359    },
7360
7361    getStateAfter: function(line, precise) {
7362      var doc = this.doc;
7363      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
7364      return getStateBefore(this, line + 1, precise);
7365    },
7366
7367    cursorCoords: function(start, mode) {
7368      var pos, range = this.doc.sel.primary();
7369      if (start == null) pos = range.head;
7370      else if (typeof start == "object") pos = clipPos(this.doc, start);
7371      else pos = start ? range.from() : range.to();
7372      return cursorCoords(this, pos, mode || "page");
7373    },
7374
7375    charCoords: function(pos, mode) {
7376      return charCoords(this, clipPos(this.doc, pos), mode || "page");
7377    },
7378
7379    coordsChar: function(coords, mode) {
7380      coords = fromCoordSystem(this, coords, mode || "page");
7381      return coordsChar(this, coords.left, coords.top);
7382    },
7383
7384    lineAtHeight: function(height, mode) {
7385      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
7386      return lineAtHeight(this.doc, height + this.display.viewOffset);
7387    },
7388    heightAtLine: function(line, mode) {
7389      var end = false, lineObj;
7390      if (typeof line == "number") {
7391        var last = this.doc.first + this.doc.size - 1;
7392        if (line < this.doc.first) line = this.doc.first;
7393        else if (line > last) { line = last; end = true; }
7394        lineObj = getLine(this.doc, line);
7395      } else {
7396        lineObj = line;
7397      }
7398      return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page").top +
7399        (end ? this.doc.height - heightAtLine(lineObj) : 0);
7400    },
7401
7402    defaultTextHeight: function() { return textHeight(this.display); },
7403    defaultCharWidth: function() { return charWidth(this.display); },
7404
7405    setGutterMarker: methodOp(function(line, gutterID, value) {
7406      return changeLine(this.doc, line, "gutter", function(line) {
7407        var markers = line.gutterMarkers || (line.gutterMarkers = {});
7408        markers[gutterID] = value;
7409        if (!value && isEmpty(markers)) line.gutterMarkers = null;
7410        return true;
7411      });
7412    }),
7413
7414    clearGutter: methodOp(function(gutterID) {
7415      var cm = this, doc = cm.doc, i = doc.first;
7416      doc.iter(function(line) {
7417        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
7418          line.gutterMarkers[gutterID] = null;
7419          regLineChange(cm, i, "gutter");
7420          if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
7421        }
7422        ++i;
7423      });
7424    }),
7425
7426    lineInfo: function(line) {
7427      if (typeof line == "number") {
7428        if (!isLine(this.doc, line)) return null;
7429        var n = line;
7430        line = getLine(this.doc, line);
7431        if (!line) return null;
7432      } else {
7433        var n = lineNo(line);
7434        if (n == null) return null;
7435      }
7436      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
7437              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
7438              widgets: line.widgets};
7439    },
7440
7441    getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo};},
7442
7443    addWidget: function(pos, node, scroll, vert, horiz) {
7444      var display = this.display;
7445      pos = cursorCoords(this, clipPos(this.doc, pos));
7446      var top = pos.bottom, left = pos.left;
7447      node.style.position = "absolute";
7448      node.setAttribute("cm-ignore-events", "true");
7449      this.display.input.setUneditable(node);
7450      display.sizer.appendChild(node);
7451      if (vert == "over") {
7452        top = pos.top;
7453      } else if (vert == "above" || vert == "near") {
7454        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
7455        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
7456        // Default to positioning above (if specified and possible); otherwise default to positioning below
7457        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
7458          top = pos.top - node.offsetHeight;
7459        else if (pos.bottom + node.offsetHeight <= vspace)
7460          top = pos.bottom;
7461        if (left + node.offsetWidth > hspace)
7462          left = hspace - node.offsetWidth;
7463      }
7464      node.style.top = top + "px";
7465      node.style.left = node.style.right = "";
7466      if (horiz == "right") {
7467        left = display.sizer.clientWidth - node.offsetWidth;
7468        node.style.right = "0px";
7469      } else {
7470        if (horiz == "left") left = 0;
7471        else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;
7472        node.style.left = left + "px";
7473      }
7474      if (scroll)
7475        scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
7476    },
7477
7478    triggerOnKeyDown: methodOp(onKeyDown),
7479    triggerOnKeyPress: methodOp(onKeyPress),
7480    triggerOnKeyUp: onKeyUp,
7481
7482    execCommand: function(cmd) {
7483      if (commands.hasOwnProperty(cmd))
7484        return commands[cmd].call(null, this);
7485    },
7486
7487    triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),
7488
7489    findPosH: function(from, amount, unit, visually) {
7490      var dir = 1;
7491      if (amount < 0) { dir = -1; amount = -amount; }
7492      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
7493        cur = findPosH(this.doc, cur, dir, unit, visually);
7494        if (cur.hitSide) break;
7495      }
7496      return cur;
7497    },
7498
7499    moveH: methodOp(function(dir, unit) {
7500      var cm = this;
7501      cm.extendSelectionsBy(function(range) {
7502        if (cm.display.shift || cm.doc.extend || range.empty())
7503          return findPosH(cm.doc, range.head, dir, unit, cm.options.rtlMoveVisually);
7504        else
7505          return dir < 0 ? range.from() : range.to();
7506      }, sel_move);
7507    }),
7508
7509    deleteH: methodOp(function(dir, unit) {
7510      var sel = this.doc.sel, doc = this.doc;
7511      if (sel.somethingSelected())
7512        doc.replaceSelection("", null, "+delete");
7513      else
7514        deleteNearSelection(this, function(range) {
7515          var other = findPosH(doc, range.head, dir, unit, false);
7516          return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other};
7517        });
7518    }),
7519
7520    findPosV: function(from, amount, unit, goalColumn) {
7521      var dir = 1, x = goalColumn;
7522      if (amount < 0) { dir = -1; amount = -amount; }
7523      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
7524        var coords = cursorCoords(this, cur, "div");
7525        if (x == null) x = coords.left;
7526        else coords.left = x;
7527        cur = findPosV(this, coords, dir, unit);
7528        if (cur.hitSide) break;
7529      }
7530      return cur;
7531    },
7532
7533    moveV: methodOp(function(dir, unit) {
7534      var cm = this, doc = this.doc, goals = [];
7535      var collapse = !cm.display.shift && !doc.extend && doc.sel.somethingSelected();
7536      doc.extendSelectionsBy(function(range) {
7537        if (collapse)
7538          return dir < 0 ? range.from() : range.to();
7539        var headPos = cursorCoords(cm, range.head, "div");
7540        if (range.goalColumn != null) headPos.left = range.goalColumn;
7541        goals.push(headPos.left);
7542        var pos = findPosV(cm, headPos, dir, unit);
7543        if (unit == "page" && range == doc.sel.primary())
7544          addToScrollPos(cm, null, charCoords(cm, pos, "div").top - headPos.top);
7545        return pos;
7546      }, sel_move);
7547      if (goals.length) for (var i = 0; i < doc.sel.ranges.length; i++)
7548        doc.sel.ranges[i].goalColumn = goals[i];
7549    }),
7550
7551    // Find the word at the given position (as returned by coordsChar).
7552    findWordAt: function(pos) {
7553      var doc = this.doc, line = getLine(doc, pos.line).text;
7554      var start = pos.ch, end = pos.ch;
7555      if (line) {
7556        var helper = this.getHelper(pos, "wordChars");
7557        if ((pos.xRel < 0 || end == line.length) && start) --start; else ++end;
7558        var startChar = line.charAt(start);
7559        var check = isWordChar(startChar, helper)
7560          ? function(ch) { return isWordChar(ch, helper); }
7561          : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}
7562          : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
7563        while (start > 0 && check(line.charAt(start - 1))) --start;
7564        while (end < line.length && check(line.charAt(end))) ++end;
7565      }
7566      return new Range(Pos(pos.line, start), Pos(pos.line, end));
7567    },
7568
7569    toggleOverwrite: function(value) {
7570      if (value != null && value == this.state.overwrite) return;
7571      if (this.state.overwrite = !this.state.overwrite)
7572        addClass(this.display.cursorDiv, "CodeMirror-overwrite");
7573      else
7574        rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
7575
7576      signal(this, "overwriteToggle", this, this.state.overwrite);
7577    },
7578    hasFocus: function() { return this.display.input.getField() == activeElt(); },
7579    isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit); },
7580
7581    scrollTo: methodOp(function(x, y) {
7582      if (x != null || y != null) resolveScrollToPos(this);
7583      if (x != null) this.curOp.scrollLeft = x;
7584      if (y != null) this.curOp.scrollTop = y;
7585    }),
7586    getScrollInfo: function() {
7587      var scroller = this.display.scroller;
7588      return {left: scroller.scrollLeft, top: scroller.scrollTop,
7589              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
7590              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
7591              clientHeight: displayHeight(this), clientWidth: displayWidth(this)};
7592    },
7593
7594    scrollIntoView: methodOp(function(range, margin) {
7595      if (range == null) {
7596        range = {from: this.doc.sel.primary().head, to: null};
7597        if (margin == null) margin = this.options.cursorScrollMargin;
7598      } else if (typeof range == "number") {
7599        range = {from: Pos(range, 0), to: null};
7600      } else if (range.from == null) {
7601        range = {from: range, to: null};
7602      }
7603      if (!range.to) range.to = range.from;
7604      range.margin = margin || 0;
7605
7606      if (range.from.line != null) {
7607        resolveScrollToPos(this);
7608        this.curOp.scrollToPos = range;
7609      } else {
7610        var sPos = calculateScrollPos(this, Math.min(range.from.left, range.to.left),
7611                                      Math.min(range.from.top, range.to.top) - range.margin,
7612                                      Math.max(range.from.right, range.to.right),
7613                                      Math.max(range.from.bottom, range.to.bottom) + range.margin);
7614        this.scrollTo(sPos.scrollLeft, sPos.scrollTop);
7615      }
7616    }),
7617
7618    setSize: methodOp(function(width, height) {
7619      var cm = this;
7620      function interpret(val) {
7621        return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
7622      }
7623      if (width != null) cm.display.wrapper.style.width = interpret(width);
7624      if (height != null) cm.display.wrapper.style.height = interpret(height);
7625      if (cm.options.lineWrapping) clearLineMeasurementCache(this);
7626      var lineNo = cm.display.viewFrom;
7627      cm.doc.iter(lineNo, cm.display.viewTo, function(line) {
7628        if (line.widgets) for (var i = 0; i < line.widgets.length; i++)
7629          if (line.widgets[i].noHScroll) { regLineChange(cm, lineNo, "widget"); break; }
7630        ++lineNo;
7631      });
7632      cm.curOp.forceUpdate = true;
7633      signal(cm, "refresh", this);
7634    }),
7635
7636    operation: function(f){return runInOp(this, f);},
7637
7638    refresh: methodOp(function() {
7639      var oldHeight = this.display.cachedTextHeight;
7640      regChange(this);
7641      this.curOp.forceUpdate = true;
7642      clearCaches(this);
7643      this.scrollTo(this.doc.scrollLeft, this.doc.scrollTop);
7644      updateGutterSpace(this);
7645      if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
7646        estimateLineHeights(this);
7647      signal(this, "refresh", this);
7648    }),
7649
7650    swapDoc: methodOp(function(doc) {
7651      var old = this.doc;
7652      old.cm = null;
7653      attachDoc(this, doc);
7654      clearCaches(this);
7655      this.display.input.reset();
7656      this.scrollTo(doc.scrollLeft, doc.scrollTop);
7657      this.curOp.forceScroll = true;
7658      signalLater(this, "swapDoc", this, old);
7659      return old;
7660    }),
7661
7662    getInputField: function(){return this.display.input.getField();},
7663    getWrapperElement: function(){return this.display.wrapper;},
7664    getScrollerElement: function(){return this.display.scroller;},
7665    getGutterElement: function(){return this.display.gutters;}
7666  };
7667  eventMixin(CodeMirror);
7668
7669  // OPTION DEFAULTS
7670
7671  // The default configuration options.
7672  var defaults = CodeMirror.defaults = {};
7673  // Functions to run when options are changed.
7674  var optionHandlers = CodeMirror.optionHandlers = {};
7675
7676  function option(name, deflt, handle, notOnInit) {
7677    CodeMirror.defaults[name] = deflt;
7678    if (handle) optionHandlers[name] =
7679      notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;
7680  }
7681
7682  // Passed to option handlers when there is no old value.
7683  var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};
7684
7685  // These two are, on init, called from the constructor because they
7686  // have to be initialized before the editor can start at all.
7687  option("value", "", function(cm, val) {
7688    cm.setValue(val);
7689  }, true);
7690  option("mode", null, function(cm, val) {
7691    cm.doc.modeOption = val;
7692    loadMode(cm);
7693  }, true);
7694
7695  option("indentUnit", 2, loadMode, true);
7696  option("indentWithTabs", false);
7697  option("smartIndent", true);
7698  option("tabSize", 4, function(cm) {
7699    resetModeState(cm);
7700    clearCaches(cm);
7701    regChange(cm);
7702  }, true);
7703  option("lineSeparator", null, function(cm, val) {
7704    cm.doc.lineSep = val;
7705    if (!val) return;
7706    var newBreaks = [], lineNo = cm.doc.first;
7707    cm.doc.iter(function(line) {
7708      for (var pos = 0;;) {
7709        var found = line.text.indexOf(val, pos);
7710        if (found == -1) break;
7711        pos = found + val.length;
7712        newBreaks.push(Pos(lineNo, found));
7713      }
7714      lineNo++;
7715    });
7716    for (var i = newBreaks.length - 1; i >= 0; i--)
7717      replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length))
7718  });
7719  option("specialChars", /[\u0000-\u001f\u007f\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val, old) {
7720    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
7721    if (old != CodeMirror.Init) cm.refresh();
7722  });
7723  option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {cm.refresh();}, true);
7724  option("electricChars", true);
7725  option("inputStyle", mobile ? "contenteditable" : "textarea", function() {
7726    throw new Error("inputStyle can not (yet) be changed in a running editor"); // FIXME
7727  }, true);
7728  option("rtlMoveVisually", !windows);
7729  option("wholeLineUpdateBefore", true);
7730
7731  option("theme", "default", function(cm) {
7732    themeChanged(cm);
7733    guttersChanged(cm);
7734  }, true);
7735  option("keyMap", "default", function(cm, val, old) {
7736    var next = getKeyMap(val);
7737    var prev = old != CodeMirror.Init && getKeyMap(old);
7738    if (prev && prev.detach) prev.detach(cm, next);
7739    if (next.attach) next.attach(cm, prev || null);
7740  });
7741  option("extraKeys", null);
7742
7743  option("lineWrapping", false, wrappingChanged, true);
7744  option("gutters", [], function(cm) {
7745    setGuttersForLineNumbers(cm.options);
7746    guttersChanged(cm);
7747  }, true);
7748  option("fixedGutter", true, function(cm, val) {
7749    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
7750    cm.refresh();
7751  }, true);
7752  option("coverGutterNextToScrollbar", false, function(cm) {updateScrollbars(cm);}, true);
7753  option("scrollbarStyle", "native", function(cm) {
7754    initScrollbars(cm);
7755    updateScrollbars(cm);
7756    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
7757    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
7758  }, true);
7759  option("lineNumbers", false, function(cm) {
7760    setGuttersForLineNumbers(cm.options);
7761    guttersChanged(cm);
7762  }, true);
7763  option("firstLineNumber", 1, guttersChanged, true);
7764  option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
7765  option("showCursorWhenSelecting", false, updateSelection, true);
7766
7767  option("resetSelectionOnContextMenu", true);
7768  option("lineWiseCopyCut", true);
7769
7770  option("readOnly", false, function(cm, val) {
7771    if (val == "nocursor") {
7772      onBlur(cm);
7773      cm.display.input.blur();
7774      cm.display.disabled = true;
7775    } else {
7776      cm.display.disabled = false;
7777    }
7778    cm.display.input.readOnlyChanged(val)
7779  });
7780  option("disableInput", false, function(cm, val) {if (!val) cm.display.input.reset();}, true);
7781  option("dragDrop", true, dragDropChanged);
7782  option("allowDropFileTypes", null);
7783
7784  option("cursorBlinkRate", 530);
7785  option("cursorScrollMargin", 0);
7786  option("cursorHeight", 1, updateSelection, true);
7787  option("singleCursorHeightPerLine", true, updateSelection, true);
7788  option("workTime", 100);
7789  option("workDelay", 100);
7790  option("flattenSpans", true, resetModeState, true);
7791  option("addModeClass", false, resetModeState, true);
7792  option("pollInterval", 100);
7793  option("undoDepth", 200, function(cm, val){cm.doc.history.undoDepth = val;});
7794  option("historyEventDelay", 1250);
7795  option("viewportMargin", 10, function(cm){cm.refresh();}, true);
7796  option("maxHighlightLength", 10000, resetModeState, true);
7797  option("moveInputWithCursor", true, function(cm, val) {
7798    if (!val) cm.display.input.resetPosition();
7799  });
7800
7801  option("tabindex", null, function(cm, val) {
7802    cm.display.input.getField().tabIndex = val || "";
7803  });
7804  option("autofocus", null);
7805
7806  // MODE DEFINITION AND QUERYING
7807
7808  // Known modes, by name and by MIME
7809  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
7810
7811  // Extra arguments are stored as the mode's dependencies, which is
7812  // used by (legacy) mechanisms like loadmode.js to automatically
7813  // load a mode. (Preferred mechanism is the require/define calls.)
7814  CodeMirror.defineMode = function(name, mode) {
7815    if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
7816    if (arguments.length > 2)
7817      mode.dependencies = Array.prototype.slice.call(arguments, 2);
7818    modes[name] = mode;
7819  };
7820
7821  CodeMirror.defineMIME = function(mime, spec) {
7822    mimeModes[mime] = spec;
7823  };
7824
7825  // Given a MIME type, a {name, ...options} config object, or a name
7826  // string, return a mode config object.
7827  CodeMirror.resolveMode = function(spec) {
7828    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
7829      spec = mimeModes[spec];
7830    } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
7831      var found = mimeModes[spec.name];
7832      if (typeof found == "string") found = {name: found};
7833      spec = createObj(found, spec);
7834      spec.name = found.name;
7835    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
7836      return CodeMirror.resolveMode("application/xml");
7837    }
7838    if (typeof spec == "string") return {name: spec};
7839    else return spec || {name: "null"};
7840  };
7841
7842  // Given a mode spec (anything that resolveMode accepts), find and
7843  // initialize an actual mode object.
7844  CodeMirror.getMode = function(options, spec) {
7845    var spec = CodeMirror.resolveMode(spec);
7846    var mfactory = modes[spec.name];
7847    if (!mfactory) return CodeMirror.getMode(options, "text/plain");
7848    var modeObj = mfactory(options, spec);
7849    if (modeExtensions.hasOwnProperty(spec.name)) {
7850      var exts = modeExtensions[spec.name];
7851      for (var prop in exts) {
7852        if (!exts.hasOwnProperty(prop)) continue;
7853        if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];
7854        modeObj[prop] = exts[prop];
7855      }
7856    }
7857    modeObj.name = spec.name;
7858    if (spec.helperType) modeObj.helperType = spec.helperType;
7859    if (spec.modeProps) for (var prop in spec.modeProps)
7860      modeObj[prop] = spec.modeProps[prop];
7861
7862    return modeObj;
7863  };
7864
7865  // Minimal default mode.
7866  CodeMirror.defineMode("null", function() {
7867    return {token: function(stream) {stream.skipToEnd();}};
7868  });
7869  CodeMirror.defineMIME("text/plain", "null");
7870
7871  // This can be used to attach properties to mode objects from
7872  // outside the actual mode definition.
7873  var modeExtensions = CodeMirror.modeExtensions = {};
7874  CodeMirror.extendMode = function(mode, properties) {
7875    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
7876    copyObj(properties, exts);
7877  };
7878
7879  // EXTENSIONS
7880
7881  CodeMirror.defineExtension = function(name, func) {
7882    CodeMirror.prototype[name] = func;
7883  };
7884  CodeMirror.defineDocExtension = function(name, func) {
7885    Doc.prototype[name] = func;
7886  };
7887  CodeMirror.defineOption = option;
7888
7889  var initHooks = [];
7890  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
7891
7892  var helpers = CodeMirror.helpers = {};
7893  CodeMirror.registerHelper = function(type, name, value) {
7894    if (!helpers.hasOwnProperty(type)) helpers[type] = CodeMirror[type] = {_global: []};
7895    helpers[type][name] = value;
7896  };
7897  CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
7898    CodeMirror.registerHelper(type, name, value);
7899    helpers[type]._global.push({pred: predicate, val: value});
7900  };
7901
7902  // MODE STATE HANDLING
7903
7904  // Utility functions for working with state. Exported because nested
7905  // modes need to do this for their inner modes.
7906
7907  var copyState = CodeMirror.copyState = function(mode, state) {
7908    if (state === true) return state;
7909    if (mode.copyState) return mode.copyState(state);
7910    var nstate = {};
7911    for (var n in state) {
7912      var val = state[n];
7913      if (val instanceof Array) val = val.concat([]);
7914      nstate[n] = val;
7915    }
7916    return nstate;
7917  };
7918
7919  var startState = CodeMirror.startState = function(mode, a1, a2) {
7920    return mode.startState ? mode.startState(a1, a2) : true;
7921  };
7922
7923  // Given a mode and a state (for that mode), find the inner mode and
7924  // state at the position that the state refers to.
7925  CodeMirror.innerMode = function(mode, state) {
7926    while (mode.innerMode) {
7927      var info = mode.innerMode(state);
7928      if (!info || info.mode == mode) break;
7929      state = info.state;
7930      mode = info.mode;
7931    }
7932    return info || {mode: mode, state: state};
7933  };
7934
7935  // STANDARD COMMANDS
7936
7937  // Commands are parameter-less actions that can be performed on an
7938  // editor, mostly used for keybindings.
7939  var commands = CodeMirror.commands = {
7940    selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);},
7941    singleSelection: function(cm) {
7942      cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
7943    },
7944    killLine: function(cm) {
7945      deleteNearSelection(cm, function(range) {
7946        if (range.empty()) {
7947          var len = getLine(cm.doc, range.head.line).text.length;
7948          if (range.head.ch == len && range.head.line < cm.lastLine())
7949            return {from: range.head, to: Pos(range.head.line + 1, 0)};
7950          else
7951            return {from: range.head, to: Pos(range.head.line, len)};
7952        } else {
7953          return {from: range.from(), to: range.to()};
7954        }
7955      });
7956    },
7957    deleteLine: function(cm) {
7958      deleteNearSelection(cm, function(range) {
7959        return {from: Pos(range.from().line, 0),
7960                to: clipPos(cm.doc, Pos(range.to().line + 1, 0))};
7961      });
7962    },
7963    delLineLeft: function(cm) {
7964      deleteNearSelection(cm, function(range) {
7965        return {from: Pos(range.from().line, 0), to: range.from()};
7966      });
7967    },
7968    delWrappedLineLeft: function(cm) {
7969      deleteNearSelection(cm, function(range) {
7970        var top = cm.charCoords(range.head, "div").top + 5;
7971        var leftPos = cm.coordsChar({left: 0, top: top}, "div");
7972        return {from: leftPos, to: range.from()};
7973      });
7974    },
7975    delWrappedLineRight: function(cm) {
7976      deleteNearSelection(cm, function(range) {
7977        var top = cm.charCoords(range.head, "div").top + 5;
7978        var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
7979        return {from: range.from(), to: rightPos };
7980      });
7981    },
7982    undo: function(cm) {cm.undo();},
7983    redo: function(cm) {cm.redo();},
7984    undoSelection: function(cm) {cm.undoSelection();},
7985    redoSelection: function(cm) {cm.redoSelection();},
7986    goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
7987    goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
7988    goLineStart: function(cm) {
7989      cm.extendSelectionsBy(function(range) { return lineStart(cm, range.head.line); },
7990                            {origin: "+move", bias: 1});
7991    },
7992    goLineStartSmart: function(cm) {
7993      cm.extendSelectionsBy(function(range) {
7994        return lineStartSmart(cm, range.head);
7995      }, {origin: "+move", bias: 1});
7996    },
7997    goLineEnd: function(cm) {
7998      cm.extendSelectionsBy(function(range) { return lineEnd(cm, range.head.line); },
7999                            {origin: "+move", bias: -1});
8000    },
8001    goLineRight: function(cm) {
8002      cm.extendSelectionsBy(function(range) {
8003        var top = cm.charCoords(range.head, "div").top + 5;
8004        return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
8005      }, sel_move);
8006    },
8007    goLineLeft: function(cm) {
8008      cm.extendSelectionsBy(function(range) {
8009        var top = cm.charCoords(range.head, "div").top + 5;
8010        return cm.coordsChar({left: 0, top: top}, "div");
8011      }, sel_move);
8012    },
8013    goLineLeftSmart: function(cm) {
8014      cm.extendSelectionsBy(function(range) {
8015        var top = cm.charCoords(range.head, "div").top + 5;
8016        var pos = cm.coordsChar({left: 0, top: top}, "div");
8017        if (pos.ch < cm.getLine(pos.line).search(/\S/)) return lineStartSmart(cm, range.head);
8018        return pos;
8019      }, sel_move);
8020    },
8021    goLineUp: function(cm) {cm.moveV(-1, "line");},
8022    goLineDown: function(cm) {cm.moveV(1, "line");},
8023    goPageUp: function(cm) {cm.moveV(-1, "page");},
8024    goPageDown: function(cm) {cm.moveV(1, "page");},
8025    goCharLeft: function(cm) {cm.moveH(-1, "char");},
8026    goCharRight: function(cm) {cm.moveH(1, "char");},
8027    goColumnLeft: function(cm) {cm.moveH(-1, "column");},
8028    goColumnRight: function(cm) {cm.moveH(1, "column");},
8029    goWordLeft: function(cm) {cm.moveH(-1, "word");},
8030    goGroupRight: function(cm) {cm.moveH(1, "group");},
8031    goGroupLeft: function(cm) {cm.moveH(-1, "group");},
8032    goWordRight: function(cm) {cm.moveH(1, "word");},
8033    delCharBefore: function(cm) {cm.deleteH(-1, "char");},
8034    delCharAfter: function(cm) {cm.deleteH(1, "char");},
8035    delWordBefore: function(cm) {cm.deleteH(-1, "word");},
8036    delWordAfter: function(cm) {cm.deleteH(1, "word");},
8037    delGroupBefore: function(cm) {cm.deleteH(-1, "group");},
8038    delGroupAfter: function(cm) {cm.deleteH(1, "group");},
8039    indentAuto: function(cm) {cm.indentSelection("smart");},
8040    indentMore: function(cm) {cm.indentSelection("add");},
8041    indentLess: function(cm) {cm.indentSelection("subtract");},
8042    insertTab: function(cm) {cm.replaceSelection("\t");},
8043    insertSoftTab: function(cm) {
8044      var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
8045      for (var i = 0; i < ranges.length; i++) {
8046        var pos = ranges[i].from();
8047        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
8048        spaces.push(spaceStr(tabSize - col % tabSize));
8049      }
8050      cm.replaceSelections(spaces);
8051    },
8052    defaultTab: function(cm) {
8053      if (cm.somethingSelected()) cm.indentSelection("add");
8054      else cm.execCommand("insertTab");
8055    },
8056    transposeChars: function(cm) {
8057      runInOp(cm, function() {
8058        var ranges = cm.listSelections(), newSel = [];
8059        for (var i = 0; i < ranges.length; i++) {
8060          var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
8061          if (line) {
8062            if (cur.ch == line.length) cur = new Pos(cur.line, cur.ch - 1);
8063            if (cur.ch > 0) {
8064              cur = new Pos(cur.line, cur.ch + 1);
8065              cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
8066                              Pos(cur.line, cur.ch - 2), cur, "+transpose");
8067            } else if (cur.line > cm.doc.first) {
8068              var prev = getLine(cm.doc, cur.line - 1).text;
8069              if (prev)
8070                cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
8071                                prev.charAt(prev.length - 1),
8072                                Pos(cur.line - 1, prev.length - 1), Pos(cur.line, 1), "+transpose");
8073            }
8074          }
8075          newSel.push(new Range(cur, cur));
8076        }
8077        cm.setSelections(newSel);
8078      });
8079    },
8080    newlineAndIndent: function(cm) {
8081      runInOp(cm, function() {
8082        var len = cm.listSelections().length;
8083        for (var i = 0; i < len; i++) {
8084          var range = cm.listSelections()[i];
8085          cm.replaceRange(cm.doc.lineSeparator(), range.anchor, range.head, "+input");
8086          cm.indentLine(range.from().line + 1, null, true);
8087        }
8088        ensureCursorVisible(cm);
8089      });
8090    },
8091    openLine: function(cm) {cm.replaceSelection("\n", "start")},
8092    toggleOverwrite: function(cm) {cm.toggleOverwrite();}
8093  };
8094
8095
8096  // STANDARD KEYMAPS
8097
8098  var keyMap = CodeMirror.keyMap = {};
8099
8100  keyMap.basic = {
8101    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
8102    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
8103    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
8104    "Tab": "defaultTab", "Shift-Tab": "indentAuto",
8105    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
8106    "Esc": "singleSelection"
8107  };
8108  // Note that the save and find-related commands aren't defined by
8109  // default. User code or addons can define them. Unknown commands
8110  // are simply ignored.
8111  keyMap.pcDefault = {
8112    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
8113    "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
8114    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
8115    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
8116    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
8117    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
8118    "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
8119    fallthrough: "basic"
8120  };
8121  // Very basic readline/emacs-style bindings, which are standard on Mac.
8122  keyMap.emacsy = {
8123    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
8124    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
8125    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
8126    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
8127    "Ctrl-O": "openLine"
8128  };
8129  keyMap.macDefault = {
8130    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
8131    "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
8132    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
8133    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
8134    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
8135    "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
8136    "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
8137    fallthrough: ["basic", "emacsy"]
8138  };
8139  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
8140
8141  // KEYMAP DISPATCH
8142
8143  function normalizeKeyName(name) {
8144    var parts = name.split(/-(?!$)/), name = parts[parts.length - 1];
8145    var alt, ctrl, shift, cmd;
8146    for (var i = 0; i < parts.length - 1; i++) {
8147      var mod = parts[i];
8148      if (/^(cmd|meta|m)$/i.test(mod)) cmd = true;
8149      else if (/^a(lt)?$/i.test(mod)) alt = true;
8150      else if (/^(c|ctrl|control)$/i.test(mod)) ctrl = true;
8151      else if (/^s(hift)$/i.test(mod)) shift = true;
8152      else throw new Error("Unrecognized modifier name: " + mod);
8153    }
8154    if (alt) name = "Alt-" + name;
8155    if (ctrl) name = "Ctrl-" + name;
8156    if (cmd) name = "Cmd-" + name;
8157    if (shift) name = "Shift-" + name;
8158    return name;
8159  }
8160
8161  // This is a kludge to keep keymaps mostly working as raw objects
8162  // (backwards compatibility) while at the same time support features
8163  // like normalization and multi-stroke key bindings. It compiles a
8164  // new normalized keymap, and then updates the old object to reflect
8165  // this.
8166  CodeMirror.normalizeKeyMap = function(keymap) {
8167    var copy = {};
8168    for (var keyname in keymap) if (keymap.hasOwnProperty(keyname)) {
8169      var value = keymap[keyname];
8170      if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) continue;
8171      if (value == "...") { delete keymap[keyname]; continue; }
8172
8173      var keys = map(keyname.split(" "), normalizeKeyName);
8174      for (var i = 0; i < keys.length; i++) {
8175        var val, name;
8176        if (i == keys.length - 1) {
8177          name = keys.join(" ");
8178          val = value;
8179        } else {
8180          name = keys.slice(0, i + 1).join(" ");
8181          val = "...";
8182        }
8183        var prev = copy[name];
8184        if (!prev) copy[name] = val;
8185        else if (prev != val) throw new Error("Inconsistent bindings for " + name);
8186      }
8187      delete keymap[keyname];
8188    }
8189    for (var prop in copy) keymap[prop] = copy[prop];
8190    return keymap;
8191  };
8192
8193  var lookupKey = CodeMirror.lookupKey = function(key, map, handle, context) {
8194    map = getKeyMap(map);
8195    var found = map.call ? map.call(key, context) : map[key];
8196    if (found === false) return "nothing";
8197    if (found === "...") return "multi";
8198    if (found != null && handle(found)) return "handled";
8199
8200    if (map.fallthrough) {
8201      if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
8202        return lookupKey(key, map.fallthrough, handle, context);
8203      for (var i = 0; i < map.fallthrough.length; i++) {
8204        var result = lookupKey(key, map.fallthrough[i], handle, context);
8205        if (result) return result;
8206      }
8207    }
8208  };
8209
8210  // Modifier key presses don't count as 'real' key presses for the
8211  // purpose of keymap fallthrough.
8212  var isModifierKey = CodeMirror.isModifierKey = function(value) {
8213    var name = typeof value == "string" ? value : keyNames[value.keyCode];
8214    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
8215  };
8216
8217  // Look up the name of a key as indicated by an event object.
8218  var keyName = CodeMirror.keyName = function(event, noShift) {
8219    if (presto && event.keyCode == 34 && event["char"]) return false;
8220    var base = keyNames[event.keyCode], name = base;
8221    if (name == null || event.altGraphKey) return false;
8222    if (event.altKey && base != "Alt") name = "Alt-" + name;
8223    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") name = "Ctrl-" + name;
8224    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") name = "Cmd-" + name;
8225    if (!noShift && event.shiftKey && base != "Shift") name = "Shift-" + name;
8226    return name;
8227  };
8228
8229  function getKeyMap(val) {
8230    return typeof val == "string" ? keyMap[val] : val;
8231  }
8232
8233  // FROMTEXTAREA
8234
8235  CodeMirror.fromTextArea = function(textarea, options) {
8236    options = options ? copyObj(options) : {};
8237    options.value = textarea.value;
8238    if (!options.tabindex && textarea.tabIndex)
8239      options.tabindex = textarea.tabIndex;
8240    if (!options.placeholder && textarea.placeholder)
8241      options.placeholder = textarea.placeholder;
8242    // Set autofocus to true if this textarea is focused, or if it has
8243    // autofocus and no other element is focused.
8244    if (options.autofocus == null) {
8245      var hasFocus = activeElt();
8246      options.autofocus = hasFocus == textarea ||
8247        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
8248    }
8249
8250    function save() {textarea.value = cm.getValue();}
8251    if (textarea.form) {
8252      on(textarea.form, "submit", save);
8253      // Deplorable hack to make the submit method do the right thing.
8254      if (!options.leaveSubmitMethodAlone) {
8255        var form = textarea.form, realSubmit = form.submit;
8256        try {
8257          var wrappedSubmit = form.submit = function() {
8258            save();
8259            form.submit = realSubmit;
8260            form.submit();
8261            form.submit = wrappedSubmit;
8262          };
8263        } catch(e) {}
8264      }
8265    }
8266
8267    options.finishInit = function(cm) {
8268      cm.save = save;
8269      cm.getTextArea = function() { return textarea; };
8270      cm.toTextArea = function() {
8271        cm.toTextArea = isNaN; // Prevent this from being ran twice
8272        save();
8273        textarea.parentNode.removeChild(cm.getWrapperElement());
8274        textarea.style.display = "";
8275        if (textarea.form) {
8276          off(textarea.form, "submit", save);
8277          if (typeof textarea.form.submit == "function")
8278            textarea.form.submit = realSubmit;
8279        }
8280      };
8281    };
8282
8283    textarea.style.display = "none";
8284    var cm = CodeMirror(function(node) {
8285      textarea.parentNode.insertBefore(node, textarea.nextSibling);
8286    }, options);
8287    return cm;
8288  };
8289
8290  // STRING STREAM
8291
8292  // Fed to the mode parsers, provides helper functions to make
8293  // parsers more succinct.
8294
8295  var StringStream = CodeMirror.StringStream = function(string, tabSize) {
8296    this.pos = this.start = 0;
8297    this.string = string;
8298    this.tabSize = tabSize || 8;
8299    this.lastColumnPos = this.lastColumnValue = 0;
8300    this.lineStart = 0;
8301  };
8302
8303  StringStream.prototype = {
8304    eol: function() {return this.pos >= this.string.length;},
8305    sol: function() {return this.pos == this.lineStart;},
8306    peek: function() {return this.string.charAt(this.pos) || undefined;},
8307    next: function() {
8308      if (this.pos < this.string.length)
8309        return this.string.charAt(this.pos++);
8310    },
8311    eat: function(match) {
8312      var ch = this.string.charAt(this.pos);
8313      if (typeof match == "string") var ok = ch == match;
8314      else var ok = ch && (match.test ? match.test(ch) : match(ch));
8315      if (ok) {++this.pos; return ch;}
8316    },
8317    eatWhile: function(match) {
8318      var start = this.pos;
8319      while (this.eat(match)){}
8320      return this.pos > start;
8321    },
8322    eatSpace: function() {
8323      var start = this.pos;
8324      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
8325      return this.pos > start;
8326    },
8327    skipToEnd: function() {this.pos = this.string.length;},
8328    skipTo: function(ch) {
8329      var found = this.string.indexOf(ch, this.pos);
8330      if (found > -1) {this.pos = found; return true;}
8331    },
8332    backUp: function(n) {this.pos -= n;},
8333    column: function() {
8334      if (this.lastColumnPos < this.start) {
8335        this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
8336        this.lastColumnPos = this.start;
8337      }
8338      return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
8339    },
8340    indentation: function() {
8341      return countColumn(this.string, null, this.tabSize) -
8342        (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
8343    },
8344    match: function(pattern, consume, caseInsensitive) {
8345      if (typeof pattern == "string") {
8346        var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
8347        var substr = this.string.substr(this.pos, pattern.length);
8348        if (cased(substr) == cased(pattern)) {
8349          if (consume !== false) this.pos += pattern.length;
8350          return true;
8351        }
8352      } else {
8353        var match = this.string.slice(this.pos).match(pattern);
8354        if (match && match.index > 0) return null;
8355        if (match && consume !== false) this.pos += match[0].length;
8356        return match;
8357      }
8358    },
8359    current: function(){return this.string.slice(this.start, this.pos);},
8360    hideFirstChars: function(n, inner) {
8361      this.lineStart += n;
8362      try { return inner(); }
8363      finally { this.lineStart -= n; }
8364    }
8365  };
8366
8367  // TEXTMARKERS
8368
8369  // Created with markText and setBookmark methods. A TextMarker is a
8370  // handle that can be used to clear or find a marked position in the
8371  // document. Line objects hold arrays (markedSpans) containing
8372  // {from, to, marker} object pointing to such marker objects, and
8373  // indicating that such a marker is present on that line. Multiple
8374  // lines may point to the same marker when it spans across lines.
8375  // The spans will have null for their from/to properties when the
8376  // marker continues beyond the start/end of the line. Markers have
8377  // links back to the lines they currently touch.
8378
8379  var nextMarkerId = 0;
8380
8381  var TextMarker = CodeMirror.TextMarker = function(doc, type) {
8382    this.lines = [];
8383    this.type = type;
8384    this.doc = doc;
8385    this.id = ++nextMarkerId;
8386  };
8387  eventMixin(TextMarker);
8388
8389  // Clear the marker.
8390  TextMarker.prototype.clear = function() {
8391    if (this.explicitlyCleared) return;
8392    var cm = this.doc.cm, withOp = cm && !cm.curOp;
8393    if (withOp) startOperation(cm);
8394    if (hasHandler(this, "clear")) {
8395      var found = this.find();
8396      if (found) signalLater(this, "clear", found.from, found.to);
8397    }
8398    var min = null, max = null;
8399    for (var i = 0; i < this.lines.length; ++i) {
8400      var line = this.lines[i];
8401      var span = getMarkedSpanFor(line.markedSpans, this);
8402      if (cm && !this.collapsed) regLineChange(cm, lineNo(line), "text");
8403      else if (cm) {
8404        if (span.to != null) max = lineNo(line);
8405        if (span.from != null) min = lineNo(line);
8406      }
8407      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
8408      if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)
8409        updateLineHeight(line, textHeight(cm.display));
8410    }
8411    if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {
8412      var visual = visualLine(this.lines[i]), len = lineLength(visual);
8413      if (len > cm.display.maxLineLength) {
8414        cm.display.maxLine = visual;
8415        cm.display.maxLineLength = len;
8416        cm.display.maxLineChanged = true;
8417      }
8418    }
8419
8420    if (min != null && cm && this.collapsed) regChange(cm, min, max + 1);
8421    this.lines.length = 0;
8422    this.explicitlyCleared = true;
8423    if (this.atomic && this.doc.cantEdit) {
8424      this.doc.cantEdit = false;
8425      if (cm) reCheckSelection(cm.doc);
8426    }
8427    if (cm) signalLater(cm, "markerCleared", cm, this);
8428    if (withOp) endOperation(cm);
8429    if (this.parent) this.parent.clear();
8430  };
8431
8432  // Find the position of the marker in the document. Returns a {from,
8433  // to} object by default. Side can be passed to get a specific side
8434  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
8435  // Pos objects returned contain a line object, rather than a line
8436  // number (used to prevent looking up the same line twice).
8437  TextMarker.prototype.find = function(side, lineObj) {
8438    if (side == null && this.type == "bookmark") side = 1;
8439    var from, to;
8440    for (var i = 0; i < this.lines.length; ++i) {
8441      var line = this.lines[i];
8442      var span = getMarkedSpanFor(line.markedSpans, this);
8443      if (span.from != null) {
8444        from = Pos(lineObj ? line : lineNo(line), span.from);
8445        if (side == -1) return from;
8446      }
8447      if (span.to != null) {
8448        to = Pos(lineObj ? line : lineNo(line), span.to);
8449        if (side == 1) return to;
8450      }
8451    }
8452    return from && {from: from, to: to};
8453  };
8454
8455  // Signals that the marker's widget changed, and surrounding layout
8456  // should be recomputed.
8457  TextMarker.prototype.changed = function() {
8458    var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
8459    if (!pos || !cm) return;
8460    runInOp(cm, function() {
8461      var line = pos.line, lineN = lineNo(pos.line);
8462      var view = findViewForLine(cm, lineN);
8463      if (view) {
8464        clearLineMeasurementCacheFor(view);
8465        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
8466      }
8467      cm.curOp.updateMaxLine = true;
8468      if (!lineIsHidden(widget.doc, line) && widget.height != null) {
8469        var oldHeight = widget.height;
8470        widget.height = null;
8471        var dHeight = widgetHeight(widget) - oldHeight;
8472        if (dHeight)
8473          updateLineHeight(line, line.height + dHeight);
8474      }
8475    });
8476  };
8477
8478  TextMarker.prototype.attachLine = function(line) {
8479    if (!this.lines.length && this.doc.cm) {
8480      var op = this.doc.cm.curOp;
8481      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
8482        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
8483    }
8484    this.lines.push(line);
8485  };
8486  TextMarker.prototype.detachLine = function(line) {
8487    this.lines.splice(indexOf(this.lines, line), 1);
8488    if (!this.lines.length && this.doc.cm) {
8489      var op = this.doc.cm.curOp;
8490      (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
8491    }
8492  };
8493
8494  // Collapsed markers have unique ids, in order to be able to order
8495  // them, which is needed for uniquely determining an outer marker
8496  // when they overlap (they may nest, but not partially overlap).
8497  var nextMarkerId = 0;
8498
8499  // Create a marker, wire it up to the right lines, and
8500  function markText(doc, from, to, options, type) {
8501    // Shared markers (across linked documents) are handled separately
8502    // (markTextShared will call out to this again, once per
8503    // document).
8504    if (options && options.shared) return markTextShared(doc, from, to, options, type);
8505    // Ensure we are in an operation.
8506    if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);
8507
8508    var marker = new TextMarker(doc, type), diff = cmp(from, to);
8509    if (options) copyObj(options, marker, false);
8510    // Don't connect empty markers unless clearWhenEmpty is false
8511    if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
8512      return marker;
8513    if (marker.replacedWith) {
8514      // Showing up as a widget implies collapsed (widget replaces text)
8515      marker.collapsed = true;
8516      marker.widgetNode = elt("span", [marker.replacedWith], "CodeMirror-widget");
8517      if (!options.handleMouseEvents) marker.widgetNode.setAttribute("cm-ignore-events", "true");
8518      if (options.insertLeft) marker.widgetNode.insertLeft = true;
8519    }
8520    if (marker.collapsed) {
8521      if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
8522          from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
8523        throw new Error("Inserting collapsed marker partially overlapping an existing one");
8524      sawCollapsedSpans = true;
8525    }
8526
8527    if (marker.addToHistory)
8528      addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN);
8529
8530    var curLine = from.line, cm = doc.cm, updateMaxLine;
8531    doc.iter(curLine, to.line + 1, function(line) {
8532      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
8533        updateMaxLine = true;
8534      if (marker.collapsed && curLine != from.line) updateLineHeight(line, 0);
8535      addMarkedSpan(line, new MarkedSpan(marker,
8536                                         curLine == from.line ? from.ch : null,
8537                                         curLine == to.line ? to.ch : null));
8538      ++curLine;
8539    });
8540    // lineIsHidden depends on the presence of the spans, so needs a second pass
8541    if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {
8542      if (lineIsHidden(doc, line)) updateLineHeight(line, 0);
8543    });
8544
8545    if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });
8546
8547    if (marker.readOnly) {
8548      sawReadOnlySpans = true;
8549      if (doc.history.done.length || doc.history.undone.length)
8550        doc.clearHistory();
8551    }
8552    if (marker.collapsed) {
8553      marker.id = ++nextMarkerId;
8554      marker.atomic = true;
8555    }
8556    if (cm) {
8557      // Sync editor state
8558      if (updateMaxLine) cm.curOp.updateMaxLine = true;
8559      if (marker.collapsed)
8560        regChange(cm, from.line, to.line + 1);
8561      else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css)
8562        for (var i = from.line; i <= to.line; i++) regLineChange(cm, i, "text");
8563      if (marker.atomic) reCheckSelection(cm.doc);
8564      signalLater(cm, "markerAdded", cm, marker);
8565    }
8566    return marker;
8567  }
8568
8569  // SHARED TEXTMARKERS
8570
8571  // A shared marker spans multiple linked documents. It is
8572  // implemented as a meta-marker-object controlling multiple normal
8573  // markers.
8574  var SharedTextMarker = CodeMirror.SharedTextMarker = function(markers, primary) {
8575    this.markers = markers;
8576    this.primary = primary;
8577    for (var i = 0; i < markers.length; ++i)
8578      markers[i].parent = this;
8579  };
8580  eventMixin(SharedTextMarker);
8581
8582  SharedTextMarker.prototype.clear = function() {
8583    if (this.explicitlyCleared) return;
8584    this.explicitlyCleared = true;
8585    for (var i = 0; i < this.markers.length; ++i)
8586      this.markers[i].clear();
8587    signalLater(this, "clear");
8588  };
8589  SharedTextMarker.prototype.find = function(side, lineObj) {
8590    return this.primary.find(side, lineObj);
8591  };
8592
8593  function markTextShared(doc, from, to, options, type) {
8594    options = copyObj(options);
8595    options.shared = false;
8596    var markers = [markText(doc, from, to, options, type)], primary = markers[0];
8597    var widget = options.widgetNode;
8598    linkedDocs(doc, function(doc) {
8599      if (widget) options.widgetNode = widget.cloneNode(true);
8600      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
8601      for (var i = 0; i < doc.linked.length; ++i)
8602        if (doc.linked[i].isParent) return;
8603      primary = lst(markers);
8604    });
8605    return new SharedTextMarker(markers, primary);
8606  }
8607
8608  function findSharedMarkers(doc) {
8609    return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())),
8610                         function(m) { return m.parent; });
8611  }
8612
8613  function copySharedMarkers(doc, markers) {
8614    for (var i = 0; i < markers.length; i++) {
8615      var marker = markers[i], pos = marker.find();
8616      var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
8617      if (cmp(mFrom, mTo)) {
8618        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
8619        marker.markers.push(subMark);
8620        subMark.parent = marker;
8621      }
8622    }
8623  }
8624
8625  function detachSharedMarkers(markers) {
8626    for (var i = 0; i < markers.length; i++) {
8627      var marker = markers[i], linked = [marker.primary.doc];;
8628      linkedDocs(marker.primary.doc, function(d) { linked.push(d); });
8629      for (var j = 0; j < marker.markers.length; j++) {
8630        var subMarker = marker.markers[j];
8631        if (indexOf(linked, subMarker.doc) == -1) {
8632          subMarker.parent = null;
8633          marker.markers.splice(j--, 1);
8634        }
8635      }
8636    }
8637  }
8638
8639  // TEXTMARKER SPANS
8640
8641  function MarkedSpan(marker, from, to) {
8642    this.marker = marker;
8643    this.from = from; this.to = to;
8644  }
8645
8646  // Search an array of spans for a span matching the given marker.
8647  function getMarkedSpanFor(spans, marker) {
8648    if (spans) for (var i = 0; i < spans.length; ++i) {
8649      var span = spans[i];
8650      if (span.marker == marker) return span;
8651    }
8652  }
8653  // Remove a span from an array, returning undefined if no spans are
8654  // left (we don't store arrays for lines without spans).
8655  function removeMarkedSpan(spans, span) {
8656    for (var r, i = 0; i < spans.length; ++i)
8657      if (spans[i] != span) (r || (r = [])).push(spans[i]);
8658    return r;
8659  }
8660  // Add a span to a line.
8661  function addMarkedSpan(line, span) {
8662    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
8663    span.marker.attachLine(line);
8664  }
8665
8666  // Used for the algorithm that adjusts markers for a change in the
8667  // document. These functions cut an array of spans at a given
8668  // character position, returning an array of remaining chunks (or
8669  // undefined if nothing remains).
8670  function markedSpansBefore(old, startCh, isInsert) {
8671    if (old) for (var i = 0, nw; i < old.length; ++i) {
8672      var span = old[i], marker = span.marker;
8673      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
8674      if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
8675        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
8676        (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
8677      }
8678    }
8679    return nw;
8680  }
8681  function markedSpansAfter(old, endCh, isInsert) {
8682    if (old) for (var i = 0, nw; i < old.length; ++i) {
8683      var span = old[i], marker = span.marker;
8684      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
8685      if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
8686        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
8687        (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
8688                                              span.to == null ? null : span.to - endCh));
8689      }
8690    }
8691    return nw;
8692  }
8693
8694  // Given a change object, compute the new set of marker spans that
8695  // cover the line in which the change took place. Removes spans
8696  // entirely within the change, reconnects spans belonging to the
8697  // same marker that appear on both sides of the change, and cuts off
8698  // spans partially within the change. Returns an array of span
8699  // arrays with one element for each line in (after) the change.
8700  function stretchSpansOverChange(doc, change) {
8701    if (change.full) return null;
8702    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
8703    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
8704    if (!oldFirst && !oldLast) return null;
8705
8706    var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
8707    // Get the spans that 'stick out' on both sides
8708    var first = markedSpansBefore(oldFirst, startCh, isInsert);
8709    var last = markedSpansAfter(oldLast, endCh, isInsert);
8710
8711    // Next, merge those two ends
8712    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
8713    if (first) {
8714      // Fix up .to properties of first
8715      for (var i = 0; i < first.length; ++i) {
8716        var span = first[i];
8717        if (span.to == null) {
8718          var found = getMarkedSpanFor(last, span.marker);
8719          if (!found) span.to = startCh;
8720          else if (sameLine) span.to = found.to == null ? null : found.to + offset;
8721        }
8722      }
8723    }
8724    if (last) {
8725      // Fix up .from in last (or move them into first in case of sameLine)
8726      for (var i = 0; i < last.length; ++i) {
8727        var span = last[i];
8728        if (span.to != null) span.to += offset;
8729        if (span.from == null) {
8730          var found = getMarkedSpanFor(first, span.marker);
8731          if (!found) {
8732            span.from = offset;
8733            if (sameLine) (first || (first = [])).push(span);
8734          }
8735        } else {
8736          span.from += offset;
8737          if (sameLine) (first || (first = [])).push(span);
8738        }
8739      }
8740    }
8741    // Make sure we didn't create any zero-length spans
8742    if (first) first = clearEmptySpans(first);
8743    if (last && last != first) last = clearEmptySpans(last);
8744
8745    var newMarkers = [first];
8746    if (!sameLine) {
8747      // Fill gap with whole-line-spans
8748      var gap = change.text.length - 2, gapMarkers;
8749      if (gap > 0 && first)
8750        for (var i = 0; i < first.length; ++i)
8751          if (first[i].to == null)
8752            (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i].marker, null, null));
8753      for (var i = 0; i < gap; ++i)
8754        newMarkers.push(gapMarkers);
8755      newMarkers.push(last);
8756    }
8757    return newMarkers;
8758  }
8759
8760  // Remove spans that are empty and don't have a clearWhenEmpty
8761  // option of false.
8762  function clearEmptySpans(spans) {
8763    for (var i = 0; i < spans.length; ++i) {
8764      var span = spans[i];
8765      if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
8766        spans.splice(i--, 1);
8767    }
8768    if (!spans.length) return null;
8769    return spans;
8770  }
8771
8772  // Used for un/re-doing changes from the history. Combines the
8773  // result of computing the existing spans with the set of spans that
8774  // existed in the history (so that deleting around a span and then
8775  // undoing brings back the span).
8776  function mergeOldSpans(doc, change) {
8777    var old = getOldSpans(doc, change);
8778    var stretched = stretchSpansOverChange(doc, change);
8779    if (!old) return stretched;
8780    if (!stretched) return old;
8781
8782    for (var i = 0; i < old.length; ++i) {
8783      var oldCur = old[i], stretchCur = stretched[i];
8784      if (oldCur && stretchCur) {
8785        spans: for (var j = 0; j < stretchCur.length; ++j) {
8786          var span = stretchCur[j];
8787          for (var k = 0; k < oldCur.length; ++k)
8788            if (oldCur[k].marker == span.marker) continue spans;
8789          oldCur.push(span);
8790        }
8791      } else if (stretchCur) {
8792        old[i] = stretchCur;
8793      }
8794    }
8795    return old;
8796  }
8797
8798  // Used to 'clip' out readOnly ranges when making a change.
8799  function removeReadOnlyRanges(doc, from, to) {
8800    var markers = null;
8801    doc.iter(from.line, to.line + 1, function(line) {
8802      if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
8803        var mark = line.markedSpans[i].marker;
8804        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
8805          (markers || (markers = [])).push(mark);
8806      }
8807    });
8808    if (!markers) return null;
8809    var parts = [{from: from, to: to}];
8810    for (var i = 0; i < markers.length; ++i) {
8811      var mk = markers[i], m = mk.find(0);
8812      for (var j = 0; j < parts.length; ++j) {
8813        var p = parts[j];
8814        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) continue;
8815        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
8816        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
8817          newParts.push({from: p.from, to: m.from});
8818        if (dto > 0 || !mk.inclusiveRight && !dto)
8819          newParts.push({from: m.to, to: p.to});
8820        parts.splice.apply(parts, newParts);
8821        j += newParts.length - 1;
8822      }
8823    }
8824    return parts;
8825  }
8826
8827  // Connect or disconnect spans from a line.
8828  function detachMarkedSpans(line) {
8829    var spans = line.markedSpans;
8830    if (!spans) return;
8831    for (var i = 0; i < spans.length; ++i)
8832      spans[i].marker.detachLine(line);
8833    line.markedSpans = null;
8834  }
8835  function attachMarkedSpans(line, spans) {
8836    if (!spans) return;
8837    for (var i = 0; i < spans.length; ++i)
8838      spans[i].marker.attachLine(line);
8839    line.markedSpans = spans;
8840  }
8841
8842  // Helpers used when computing which overlapping collapsed span
8843  // counts as the larger one.
8844  function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0; }
8845  function extraRight(marker) { return marker.inclusiveRight ? 1 : 0; }
8846
8847  // Returns a number indicating which of two overlapping collapsed
8848  // spans is larger (and thus includes the other). Falls back to
8849  // comparing ids when the spans cover exactly the same range.
8850  function compareCollapsedMarkers(a, b) {
8851    var lenDiff = a.lines.length - b.lines.length;
8852    if (lenDiff != 0) return lenDiff;
8853    var aPos = a.find(), bPos = b.find();
8854    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
8855    if (fromCmp) return -fromCmp;
8856    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
8857    if (toCmp) return toCmp;
8858    return b.id - a.id;
8859  }
8860
8861  // Find out whether a line ends or starts in a collapsed span. If
8862  // so, return the marker for that span.
8863  function collapsedSpanAtSide(line, start) {
8864    var sps = sawCollapsedSpans && line.markedSpans, found;
8865    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
8866      sp = sps[i];
8867      if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
8868          (!found || compareCollapsedMarkers(found, sp.marker) < 0))
8869        found = sp.marker;
8870    }
8871    return found;
8872  }
8873  function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true); }
8874  function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false); }
8875
8876  // Test whether there exists a collapsed span that partially
8877  // overlaps (covers the start or end, but not both) of a new span.
8878  // Such overlap is not allowed.
8879  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
8880    var line = getLine(doc, lineNo);
8881    var sps = sawCollapsedSpans && line.markedSpans;
8882    if (sps) for (var i = 0; i < sps.length; ++i) {
8883      var sp = sps[i];
8884      if (!sp.marker.collapsed) continue;
8885      var found = sp.marker.find(0);
8886      var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
8887      var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
8888      if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) continue;
8889      if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
8890          fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
8891        return true;
8892    }
8893  }
8894
8895  // A visual line is a line as drawn on the screen. Folding, for
8896  // example, can cause multiple logical lines to appear on the same
8897  // visual line. This finds the start of the visual line that the
8898  // given line is part of (usually that is the line itself).
8899  function visualLine(line) {
8900    var merged;
8901    while (merged = collapsedSpanAtStart(line))
8902      line = merged.find(-1, true).line;
8903    return line;
8904  }
8905
8906  // Returns an array of logical lines that continue the visual line
8907  // started by the argument, or undefined if there are no such lines.
8908  function visualLineContinued(line) {
8909    var merged, lines;
8910    while (merged = collapsedSpanAtEnd(line)) {
8911      line = merged.find(1, true).line;
8912      (lines || (lines = [])).push(line);
8913    }
8914    return lines;
8915  }
8916
8917  // Get the line number of the start of the visual line that the
8918  // given line number is part of.
8919  function visualLineNo(doc, lineN) {
8920    var line = getLine(doc, lineN), vis = visualLine(line);
8921    if (line == vis) return lineN;
8922    return lineNo(vis);
8923  }
8924  // Get the line number of the start of the next visual line after
8925  // the given line.
8926  function visualLineEndNo(doc, lineN) {
8927    if (lineN > doc.lastLine()) return lineN;
8928    var line = getLine(doc, lineN), merged;
8929    if (!lineIsHidden(doc, line)) return lineN;
8930    while (merged = collapsedSpanAtEnd(line))
8931      line = merged.find(1, true).line;
8932    return lineNo(line) + 1;
8933  }
8934
8935  // Compute whether a line is hidden. Lines count as hidden when they
8936  // are part of a visual line that starts with another line, or when
8937  // they are entirely covered by collapsed, non-widget span.
8938  function lineIsHidden(doc, line) {
8939    var sps = sawCollapsedSpans && line.markedSpans;
8940    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
8941      sp = sps[i];
8942      if (!sp.marker.collapsed) continue;
8943      if (sp.from == null) return true;
8944      if (sp.marker.widgetNode) continue;
8945      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
8946        return true;
8947    }
8948  }
8949  function lineIsHiddenInner(doc, line, span) {
8950    if (span.to == null) {
8951      var end = span.marker.find(1, true);
8952      return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker));
8953    }
8954    if (span.marker.inclusiveRight && span.to == line.text.length)
8955      return true;
8956    for (var sp, i = 0; i < line.markedSpans.length; ++i) {
8957      sp = line.markedSpans[i];
8958      if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
8959          (sp.to == null || sp.to != span.from) &&
8960          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
8961          lineIsHiddenInner(doc, line, sp)) return true;
8962    }
8963  }
8964
8965  // LINE WIDGETS
8966
8967  // Line widgets are block elements displayed above or below a line.
8968
8969  var LineWidget = CodeMirror.LineWidget = function(doc, node, options) {
8970    if (options) for (var opt in options) if (options.hasOwnProperty(opt))
8971      this[opt] = options[opt];
8972    this.doc = doc;
8973    this.node = node;
8974  };
8975  eventMixin(LineWidget);
8976
8977  function adjustScrollWhenAboveVisible(cm, line, diff) {
8978    if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
8979      addToScrollPos(cm, null, diff);
8980  }
8981
8982  LineWidget.prototype.clear = function() {
8983    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
8984    if (no == null || !ws) return;
8985    for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
8986    if (!ws.length) line.widgets = null;
8987    var height = widgetHeight(this);
8988    updateLineHeight(line, Math.max(0, line.height - height));
8989    if (cm) runInOp(cm, function() {
8990      adjustScrollWhenAboveVisible(cm, line, -height);
8991      regLineChange(cm, no, "widget");
8992    });
8993  };
8994  LineWidget.prototype.changed = function() {
8995    var oldH = this.height, cm = this.doc.cm, line = this.line;
8996    this.height = null;
8997    var diff = widgetHeight(this) - oldH;
8998    if (!diff) return;
8999    updateLineHeight(line, line.height + diff);
9000    if (cm) runInOp(cm, function() {
9001      cm.curOp.forceUpdate = true;
9002      adjustScrollWhenAboveVisible(cm, line, diff);
9003    });
9004  };
9005
9006  function widgetHeight(widget) {
9007    if (widget.height != null) return widget.height;
9008    var cm = widget.doc.cm;
9009    if (!cm) return 0;
9010    if (!contains(document.body, widget.node)) {
9011      var parentStyle = "position: relative;";
9012      if (widget.coverGutter)
9013        parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
9014      if (widget.noHScroll)
9015        parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
9016      removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
9017    }
9018    return widget.height = widget.node.parentNode.offsetHeight;
9019  }
9020
9021  function addLineWidget(doc, handle, node, options) {
9022    var widget = new LineWidget(doc, node, options);
9023    var cm = doc.cm;
9024    if (cm && widget.noHScroll) cm.display.alignWidgets = true;
9025    changeLine(doc, handle, "widget", function(line) {
9026      var widgets = line.widgets || (line.widgets = []);
9027      if (widget.insertAt == null) widgets.push(widget);
9028      else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
9029      widget.line = line;
9030      if (cm && !lineIsHidden(doc, line)) {
9031        var aboveVisible = heightAtLine(line) < doc.scrollTop;
9032        updateLineHeight(line, line.height + widgetHeight(widget));
9033        if (aboveVisible) addToScrollPos(cm, null, widget.height);
9034        cm.curOp.forceUpdate = true;
9035      }
9036      return true;
9037    });
9038    return widget;
9039  }
9040
9041  // LINE DATA STRUCTURE
9042
9043  // Line objects. These hold state related to a line, including
9044  // highlighting info (the styles array).
9045  var Line = CodeMirror.Line = function(text, markedSpans, estimateHeight) {
9046    this.text = text;
9047    attachMarkedSpans(this, markedSpans);
9048    this.height = estimateHeight ? estimateHeight(this) : 1;
9049  };
9050  eventMixin(Line);
9051  Line.prototype.lineNo = function() { return lineNo(this); };
9052
9053  // Change the content (text, markers) of a line. Automatically
9054  // invalidates cached information and tries to re-estimate the
9055  // line's height.
9056  function updateLine(line, text, markedSpans, estimateHeight) {
9057    line.text = text;
9058    if (line.stateAfter) line.stateAfter = null;
9059    if (line.styles) line.styles = null;
9060    if (line.order != null) line.order = null;
9061    detachMarkedSpans(line);
9062    attachMarkedSpans(line, markedSpans);
9063    var estHeight = estimateHeight ? estimateHeight(line) : 1;
9064    if (estHeight != line.height) updateLineHeight(line, estHeight);
9065  }
9066
9067  // Detach a line from the document tree and its markers.
9068  function cleanUpLine(line) {
9069    line.parent = null;
9070    detachMarkedSpans(line);
9071  }
9072
9073  function extractLineClasses(type, output) {
9074    if (type) for (;;) {
9075      var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
9076      if (!lineClass) break;
9077      type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
9078      var prop = lineClass[1] ? "bgClass" : "textClass";
9079      if (output[prop] == null)
9080        output[prop] = lineClass[2];
9081      else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop]))
9082        output[prop] += " " + lineClass[2];
9083    }
9084    return type;
9085  }
9086
9087  function callBlankLine(mode, state) {
9088    if (mode.blankLine) return mode.blankLine(state);
9089    if (!mode.innerMode) return;
9090    var inner = CodeMirror.innerMode(mode, state);
9091    if (inner.mode.blankLine) return inner.mode.blankLine(inner.state);
9092  }
9093
9094  function readToken(mode, stream, state, inner) {
9095    for (var i = 0; i < 10; i++) {
9096      if (inner) inner[0] = CodeMirror.innerMode(mode, state).mode;
9097      var style = mode.token(stream, state);
9098      if (stream.pos > stream.start) return style;
9099    }
9100    throw new Error("Mode " + mode.name + " failed to advance stream.");
9101  }
9102
9103  // Utility for getTokenAt and getLineTokens
9104  function takeToken(cm, pos, precise, asArray) {
9105    function getObj(copy) {
9106      return {start: stream.start, end: stream.pos,
9107              string: stream.current(),
9108              type: style || null,
9109              state: copy ? copyState(doc.mode, state) : state};
9110    }
9111
9112    var doc = cm.doc, mode = doc.mode, style;
9113    pos = clipPos(doc, pos);
9114    var line = getLine(doc, pos.line), state = getStateBefore(cm, pos.line, precise);
9115    var stream = new StringStream(line.text, cm.options.tabSize), tokens;
9116    if (asArray) tokens = [];
9117    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
9118      stream.start = stream.pos;
9119      style = readToken(mode, stream, state);
9120      if (asArray) tokens.push(getObj(true));
9121    }
9122    return asArray ? tokens : getObj();
9123  }
9124
9125  // Run the given mode's parser over a line, calling f for each token.
9126  function runMode(cm, text, mode, state, f, lineClasses, forceToEnd) {
9127    var flattenSpans = mode.flattenSpans;
9128    if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;
9129    var curStart = 0, curStyle = null;
9130    var stream = new StringStream(text, cm.options.tabSize), style;
9131    var inner = cm.options.addModeClass && [null];
9132    if (text == "") extractLineClasses(callBlankLine(mode, state), lineClasses);
9133    while (!stream.eol()) {
9134      if (stream.pos > cm.options.maxHighlightLength) {
9135        flattenSpans = false;
9136        if (forceToEnd) processLine(cm, text, state, stream.pos);
9137        stream.pos = text.length;
9138        style = null;
9139      } else {
9140        style = extractLineClasses(readToken(mode, stream, state, inner), lineClasses);
9141      }
9142      if (inner) {
9143        var mName = inner[0].name;
9144        if (mName) style = "m-" + (style ? mName + " " + style : mName);
9145      }
9146      if (!flattenSpans || curStyle != style) {
9147        while (curStart < stream.start) {
9148          curStart = Math.min(stream.start, curStart + 50000);
9149          f(curStart, curStyle);
9150        }
9151        curStyle = style;
9152      }
9153      stream.start = stream.pos;
9154    }
9155    while (curStart < stream.pos) {
9156      // Webkit seems to refuse to render text nodes longer than 57444 characters
9157      var pos = Math.min(stream.pos, curStart + 50000);
9158      f(pos, curStyle);
9159      curStart = pos;
9160    }
9161  }
9162
9163  // Compute a style array (an array starting with a mode generation
9164  // -- for invalidation -- followed by pairs of end positions and
9165  // style strings), which is used to highlight the tokens on the
9166  // line.
9167  function highlightLine(cm, line, state, forceToEnd) {
9168    // A styles array always starts with a number identifying the
9169    // mode/overlays that it is based on (for easy invalidation).
9170    var st = [cm.state.modeGen], lineClasses = {};
9171    // Compute the base array of styles
9172    runMode(cm, line.text, cm.doc.mode, state, function(end, style) {
9173      st.push(end, style);
9174    }, lineClasses, forceToEnd);
9175
9176    // Run overlays, adjust style array.
9177    for (var o = 0; o < cm.state.overlays.length; ++o) {
9178      var overlay = cm.state.overlays[o], i = 1, at = 0;
9179      runMode(cm, line.text, overlay.mode, true, function(end, style) {
9180        var start = i;
9181        // Ensure there's a token end at the current position, and that i points at it
9182        while (at < end) {
9183          var i_end = st[i];
9184          if (i_end > end)
9185            st.splice(i, 1, end, st[i+1], i_end);
9186          i += 2;
9187          at = Math.min(end, i_end);
9188        }
9189        if (!style) return;
9190        if (overlay.opaque) {
9191          st.splice(start, i - start, end, "cm-overlay " + style);
9192          i = start + 2;
9193        } else {
9194          for (; start < i; start += 2) {
9195            var cur = st[start+1];
9196            st[start+1] = (cur ? cur + " " : "") + "cm-overlay " + style;
9197          }
9198        }
9199      }, lineClasses);
9200    }
9201
9202    return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null};
9203  }
9204
9205  function getLineStyles(cm, line, updateFrontier) {
9206    if (!line.styles || line.styles[0] != cm.state.modeGen) {
9207      var state = getStateBefore(cm, lineNo(line));
9208      var result = highlightLine(cm, line, line.text.length > cm.options.maxHighlightLength ? copyState(cm.doc.mode, state) : state);
9209      line.stateAfter = state;
9210      line.styles = result.styles;
9211      if (result.classes) line.styleClasses = result.classes;
9212      else if (line.styleClasses) line.styleClasses = null;
9213      if (updateFrontier === cm.doc.frontier) cm.doc.frontier++;
9214    }
9215    return line.styles;
9216  }
9217
9218  // Lightweight form of highlight -- proceed over this line and
9219  // update state, but don't save a style array. Used for lines that
9220  // aren't currently visible.
9221  function processLine(cm, text, state, startAt) {
9222    var mode = cm.doc.mode;
9223    var stream = new StringStream(text, cm.options.tabSize);
9224    stream.start = stream.pos = startAt || 0;
9225    if (text == "") callBlankLine(mode, state);
9226    while (!stream.eol()) {
9227      readToken(mode, stream, state);
9228      stream.start = stream.pos;
9229    }
9230  }
9231
9232  // Convert a style as returned by a mode (either null, or a string
9233  // containing one or more styles) to a CSS style. This is cached,
9234  // and also looks for line-wide styles.
9235  var styleToClassCache = {}, styleToClassCacheWithMode = {};
9236  function interpretTokenStyle(style, options) {
9237    if (!style || /^\s*$/.test(style)) return null;
9238    var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
9239    return cache[style] ||
9240      (cache[style] = style.replace(/\S+/g, "cm-$&"));
9241  }
9242
9243  // Render the DOM representation of the text of a line. Also builds
9244  // up a 'line map', which points at the DOM nodes that represent
9245  // specific stretches of text, and is used by the measuring code.
9246  // The returned object contains the DOM node, this map, and
9247  // information about line-wide styles that were set by the mode.
9248  function buildLineContent(cm, lineView) {
9249    // The padding-right forces the element to have a 'border', which
9250    // is needed on Webkit to be able to get line-level bounding
9251    // rectangles for it (in measureChar).
9252    var content = elt("span", null, null, webkit ? "padding-right: .1px" : null);
9253    var builder = {pre: elt("pre", [content], "CodeMirror-line"), content: content,
9254                   col: 0, pos: 0, cm: cm,
9255                   splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")};
9256    lineView.measure = {};
9257
9258    // Iterate over the logical lines that make up this visual line.
9259    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
9260      var line = i ? lineView.rest[i - 1] : lineView.line, order;
9261      builder.pos = 0;
9262      builder.addToken = buildToken;
9263      // Optionally wire in some hacks into the token-rendering
9264      // algorithm, to deal with browser quirks.
9265      if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line)))
9266        builder.addToken = buildTokenBadBidi(builder.addToken, order);
9267      builder.map = [];
9268      var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
9269      insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
9270      if (line.styleClasses) {
9271        if (line.styleClasses.bgClass)
9272          builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
9273        if (line.styleClasses.textClass)
9274          builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
9275      }
9276
9277      // Ensure at least a single node is present, for measuring.
9278      if (builder.map.length == 0)
9279        builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
9280
9281      // Store the map and a cache object for the current logical line
9282      if (i == 0) {
9283        lineView.measure.map = builder.map;
9284        lineView.measure.cache = {};
9285      } else {
9286        (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
9287        (lineView.measure.caches || (lineView.measure.caches = [])).push({});
9288      }
9289    }
9290
9291    // See issue #2901
9292    if (webkit) {
9293      var last = builder.content.lastChild
9294      if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
9295        builder.content.className = "cm-tab-wrap-hack";
9296    }
9297
9298    signal(cm, "renderLine", cm, lineView.line, builder.pre);
9299    if (builder.pre.className)
9300      builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
9301
9302    return builder;
9303  }
9304
9305  function defaultSpecialCharPlaceholder(ch) {
9306    var token = elt("span", "\u2022", "cm-invalidchar");
9307    token.title = "\\u" + ch.charCodeAt(0).toString(16);
9308    token.setAttribute("aria-label", token.title);
9309    return token;
9310  }
9311
9312  // Build up the DOM representation for a single token, and add it to
9313  // the line map. Takes care to render special characters separately.
9314  function buildToken(builder, text, style, startStyle, endStyle, title, css) {
9315    if (!text) return;
9316    var displayText = builder.splitSpaces ? text.replace(/ {3,}/g, splitSpaces) : text;
9317    var special = builder.cm.state.specialChars, mustWrap = false;
9318    if (!special.test(text)) {
9319      builder.col += text.length;
9320      var content = document.createTextNode(displayText);
9321      builder.map.push(builder.pos, builder.pos + text.length, content);
9322      if (ie && ie_version < 9) mustWrap = true;
9323      builder.pos += text.length;
9324    } else {
9325      var content = document.createDocumentFragment(), pos = 0;
9326      while (true) {
9327        special.lastIndex = pos;
9328        var m = special.exec(text);
9329        var skipped = m ? m.index - pos : text.length - pos;
9330        if (skipped) {
9331          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
9332          if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
9333          else content.appendChild(txt);
9334          builder.map.push(builder.pos, builder.pos + skipped, txt);
9335          builder.col += skipped;
9336          builder.pos += skipped;
9337        }
9338        if (!m) break;
9339        pos += skipped + 1;
9340        if (m[0] == "\t") {
9341          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
9342          var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
9343          txt.setAttribute("role", "presentation");
9344          txt.setAttribute("cm-text", "\t");
9345          builder.col += tabWidth;
9346        } else if (m[0] == "\r" || m[0] == "\n") {
9347          var txt = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
9348          txt.setAttribute("cm-text", m[0]);
9349          builder.col += 1;
9350        } else {
9351          var txt = builder.cm.options.specialCharPlaceholder(m[0]);
9352          txt.setAttribute("cm-text", m[0]);
9353          if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
9354          else content.appendChild(txt);
9355          builder.col += 1;
9356        }
9357        builder.map.push(builder.pos, builder.pos + 1, txt);
9358        builder.pos++;
9359      }
9360    }
9361    if (style || startStyle || endStyle || mustWrap || css) {
9362      var fullStyle = style || "";
9363      if (startStyle) fullStyle += startStyle;
9364      if (endStyle) fullStyle += endStyle;
9365      var token = elt("span", [content], fullStyle, css);
9366      if (title) token.title = title;
9367      return builder.content.appendChild(token);
9368    }
9369    builder.content.appendChild(content);
9370  }
9371
9372  function splitSpaces(old) {
9373    var out = " ";
9374    for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
9375    out += " ";
9376    return out;
9377  }
9378
9379  // Work around nonsense dimensions being reported for stretches of
9380  // right-to-left text.
9381  function buildTokenBadBidi(inner, order) {
9382    return function(builder, text, style, startStyle, endStyle, title, css) {
9383      style = style ? style + " cm-force-border" : "cm-force-border";
9384      var start = builder.pos, end = start + text.length;
9385      for (;;) {
9386        // Find the part that overlaps with the start of this text
9387        for (var i = 0; i < order.length; i++) {
9388          var part = order[i];
9389          if (part.to > start && part.from <= start) break;
9390        }
9391        if (part.to >= end) return inner(builder, text, style, startStyle, endStyle, title, css);
9392        inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
9393        startStyle = null;
9394        text = text.slice(part.to - start);
9395        start = part.to;
9396      }
9397    };
9398  }
9399
9400  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
9401    var widget = !ignoreWidget && marker.widgetNode;
9402    if (widget) builder.map.push(builder.pos, builder.pos + size, widget);
9403    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
9404      if (!widget)
9405        widget = builder.content.appendChild(document.createElement("span"));
9406      widget.setAttribute("cm-marker", marker.id);
9407    }
9408    if (widget) {
9409      builder.cm.display.input.setUneditable(widget);
9410      builder.content.appendChild(widget);
9411    }
9412    builder.pos += size;
9413  }
9414
9415  // Outputs a number of spans to make up a line, taking highlighting
9416  // and marked text into account.
9417  function insertLineContent(line, builder, styles) {
9418    var spans = line.markedSpans, allText = line.text, at = 0;
9419    if (!spans) {
9420      for (var i = 1; i < styles.length; i+=2)
9421        builder.addToken(builder, allText.slice(at, at = styles[i]), interpretTokenStyle(styles[i+1], builder.cm.options));
9422      return;
9423    }
9424
9425    var len = allText.length, pos = 0, i = 1, text = "", style, css;
9426    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
9427    for (;;) {
9428      if (nextChange == pos) { // Update current marker set
9429        spanStyle = spanEndStyle = spanStartStyle = title = css = "";
9430        collapsed = null; nextChange = Infinity;
9431        var foundBookmarks = [], endStyles
9432        for (var j = 0; j < spans.length; ++j) {
9433          var sp = spans[j], m = sp.marker;
9434          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
9435            foundBookmarks.push(m);
9436          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
9437            if (sp.to != null && sp.to != pos && nextChange > sp.to) {
9438              nextChange = sp.to;
9439              spanEndStyle = "";
9440            }
9441            if (m.className) spanStyle += " " + m.className;
9442            if (m.css) css = (css ? css + ";" : "") + m.css;
9443            if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
9444            if (m.endStyle && sp.to == nextChange) (endStyles || (endStyles = [])).push(m.endStyle, sp.to)
9445            if (m.title && !title) title = m.title;
9446            if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
9447              collapsed = sp;
9448          } else if (sp.from > pos && nextChange > sp.from) {
9449            nextChange = sp.from;
9450          }
9451        }
9452        if (endStyles) for (var j = 0; j < endStyles.length; j += 2)
9453          if (endStyles[j + 1] == nextChange) spanEndStyle += " " + endStyles[j]
9454
9455        if (!collapsed || collapsed.from == pos) for (var j = 0; j < foundBookmarks.length; ++j)
9456          buildCollapsedSpan(builder, 0, foundBookmarks[j]);
9457        if (collapsed && (collapsed.from || 0) == pos) {
9458          buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
9459                             collapsed.marker, collapsed.from == null);
9460          if (collapsed.to == null) return;
9461          if (collapsed.to == pos) collapsed = false;
9462        }
9463      }
9464      if (pos >= len) break;
9465
9466      var upto = Math.min(len, nextChange);
9467      while (true) {
9468        if (text) {
9469          var end = pos + text.length;
9470          if (!collapsed) {
9471            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
9472            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
9473                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css);
9474          }
9475          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
9476          pos = end;
9477          spanStartStyle = "";
9478        }
9479        text = allText.slice(at, at = styles[i++]);
9480        style = interpretTokenStyle(styles[i++], builder.cm.options);
9481      }
9482    }
9483  }
9484
9485  // DOCUMENT DATA STRUCTURE
9486
9487  // By default, updates that start and end at the beginning of a line
9488  // are treated specially, in order to make the association of line
9489  // widgets and marker elements with the text behave more intuitive.
9490  function isWholeLineUpdate(doc, change) {
9491    return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
9492      (!doc.cm || doc.cm.options.wholeLineUpdateBefore);
9493  }
9494
9495  // Perform a change on the document data structure.
9496  function updateDoc(doc, change, markedSpans, estimateHeight) {
9497    function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
9498    function update(line, text, spans) {
9499      updateLine(line, text, spans, estimateHeight);
9500      signalLater(line, "change", line, change);
9501    }
9502    function linesFor(start, end) {
9503      for (var i = start, result = []; i < end; ++i)
9504        result.push(new Line(text[i], spansFor(i), estimateHeight));
9505      return result;
9506    }
9507
9508    var from = change.from, to = change.to, text = change.text;
9509    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
9510    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
9511
9512    // Adjust the line structure
9513    if (change.full) {
9514      doc.insert(0, linesFor(0, text.length));
9515      doc.remove(text.length, doc.size - text.length);
9516    } else if (isWholeLineUpdate(doc, change)) {
9517      // This is a whole-line replace. Treated specially to make
9518      // sure line objects move the way they are supposed to.
9519      var added = linesFor(0, text.length - 1);
9520      update(lastLine, lastLine.text, lastSpans);
9521      if (nlines) doc.remove(from.line, nlines);
9522      if (added.length) doc.insert(from.line, added);
9523    } else if (firstLine == lastLine) {
9524      if (text.length == 1) {
9525        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
9526      } else {
9527        var added = linesFor(1, text.length - 1);
9528        added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
9529        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
9530        doc.insert(from.line + 1, added);
9531      }
9532    } else if (text.length == 1) {
9533      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
9534      doc.remove(from.line + 1, nlines);
9535    } else {
9536      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
9537      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
9538      var added = linesFor(1, text.length - 1);
9539      if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
9540      doc.insert(from.line + 1, added);
9541    }
9542
9543    signalLater(doc, "change", doc, change);
9544  }
9545
9546  // The document is represented as a BTree consisting of leaves, with
9547  // chunk of lines in them, and branches, with up to ten leaves or
9548  // other branch nodes below them. The top node is always a branch
9549  // node, and is the document object itself (meaning it has
9550  // additional methods and properties).
9551  //
9552  // All nodes have parent links. The tree is used both to go from
9553  // line numbers to line objects, and to go from objects to numbers.
9554  // It also indexes by height, and is used to convert between height
9555  // and line object, and to find the total height of the document.
9556  //
9557  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html
9558
9559  function LeafChunk(lines) {
9560    this.lines = lines;
9561    this.parent = null;
9562    for (var i = 0, height = 0; i < lines.length; ++i) {
9563      lines[i].parent = this;
9564      height += lines[i].height;
9565    }
9566    this.height = height;
9567  }
9568
9569  LeafChunk.prototype = {
9570    chunkSize: function() { return this.lines.length; },
9571    // Remove the n lines at offset 'at'.
9572    removeInner: function(at, n) {
9573      for (var i = at, e = at + n; i < e; ++i) {
9574        var line = this.lines[i];
9575        this.height -= line.height;
9576        cleanUpLine(line);
9577        signalLater(line, "delete");
9578      }
9579      this.lines.splice(at, n);
9580    },
9581    // Helper used to collapse a small branch into a single leaf.
9582    collapse: function(lines) {
9583      lines.push.apply(lines, this.lines);
9584    },
9585    // Insert the given array of lines at offset 'at', count them as
9586    // having the given height.
9587    insertInner: function(at, lines, height) {
9588      this.height += height;
9589      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
9590      for (var i = 0; i < lines.length; ++i) lines[i].parent = this;
9591    },
9592    // Used to iterate over a part of the tree.
9593    iterN: function(at, n, op) {
9594      for (var e = at + n; at < e; ++at)
9595        if (op(this.lines[at])) return true;
9596    }
9597  };
9598
9599  function BranchChunk(children) {
9600    this.children = children;
9601    var size = 0, height = 0;
9602    for (var i = 0; i < children.length; ++i) {
9603      var ch = children[i];
9604      size += ch.chunkSize(); height += ch.height;
9605      ch.parent = this;
9606    }
9607    this.size = size;
9608    this.height = height;
9609    this.parent = null;
9610  }
9611
9612  BranchChunk.prototype = {
9613    chunkSize: function() { return this.size; },
9614    removeInner: function(at, n) {
9615      this.size -= n;
9616      for (var i = 0; i < this.children.length; ++i) {
9617        var child = this.children[i], sz = child.chunkSize();
9618        if (at < sz) {
9619          var rm = Math.min(n, sz - at), oldHeight = child.height;
9620          child.removeInner(at, rm);
9621          this.height -= oldHeight - child.height;
9622          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
9623          if ((n -= rm) == 0) break;
9624          at = 0;
9625        } else at -= sz;
9626      }
9627      // If the result is smaller than 25 lines, ensure that it is a
9628      // single leaf node.
9629      if (this.size - n < 25 &&
9630          (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
9631        var lines = [];
9632        this.collapse(lines);
9633        this.children = [new LeafChunk(lines)];
9634        this.children[0].parent = this;
9635      }
9636    },
9637    collapse: function(lines) {
9638      for (var i = 0; i < this.children.length; ++i) this.children[i].collapse(lines);
9639    },
9640    insertInner: function(at, lines, height) {
9641      this.size += lines.length;
9642      this.height += height;
9643      for (var i = 0; i < this.children.length; ++i) {
9644        var child = this.children[i], sz = child.chunkSize();
9645        if (at <= sz) {
9646          child.insertInner(at, lines, height);
9647          if (child.lines && child.lines.length > 50) {
9648            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
9649            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
9650            var remaining = child.lines.length % 25 + 25
9651            for (var pos = remaining; pos < child.lines.length;) {
9652              var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
9653              child.height -= leaf.height;
9654              this.children.splice(++i, 0, leaf);
9655              leaf.parent = this;
9656            }
9657            child.lines = child.lines.slice(0, remaining);
9658            this.maybeSpill();
9659          }
9660          break;
9661        }
9662        at -= sz;
9663      }
9664    },
9665    // When a node has grown, check whether it should be split.
9666    maybeSpill: function() {
9667      if (this.children.length <= 10) return;
9668      var me = this;
9669      do {
9670        var spilled = me.children.splice(me.children.length - 5, 5);
9671        var sibling = new BranchChunk(spilled);
9672        if (!me.parent) { // Become the parent node
9673          var copy = new BranchChunk(me.children);
9674          copy.parent = me;
9675          me.children = [copy, sibling];
9676          me = copy;
9677       } else {
9678          me.size -= sibling.size;
9679          me.height -= sibling.height;
9680          var myIndex = indexOf(me.parent.children, me);
9681          me.parent.children.splice(myIndex + 1, 0, sibling);
9682        }
9683        sibling.parent = me.parent;
9684      } while (me.children.length > 10);
9685      me.parent.maybeSpill();
9686    },
9687    iterN: function(at, n, op) {
9688      for (var i = 0; i < this.children.length; ++i) {
9689        var child = this.children[i], sz = child.chunkSize();
9690        if (at < sz) {
9691          var used = Math.min(n, sz - at);
9692          if (child.iterN(at, used, op)) return true;
9693          if ((n -= used) == 0) break;
9694          at = 0;
9695        } else at -= sz;
9696      }
9697    }
9698  };
9699
9700  var nextDocId = 0;
9701  var Doc = CodeMirror.Doc = function(text, mode, firstLine, lineSep) {
9702    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine, lineSep);
9703    if (firstLine == null) firstLine = 0;
9704
9705    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
9706    this.first = firstLine;
9707    this.scrollTop = this.scrollLeft = 0;
9708    this.cantEdit = false;
9709    this.cleanGeneration = 1;
9710    this.frontier = firstLine;
9711    var start = Pos(firstLine, 0);
9712    this.sel = simpleSelection(start);
9713    this.history = new History(null);
9714    this.id = ++nextDocId;
9715    this.modeOption = mode;
9716    this.lineSep = lineSep;
9717    this.extend = false;
9718
9719    if (typeof text == "string") text = this.splitLines(text);
9720    updateDoc(this, {from: start, to: start, text: text});
9721    setSelection(this, simpleSelection(start), sel_dontScroll);
9722  };
9723
9724  Doc.prototype = createObj(BranchChunk.prototype, {
9725    constructor: Doc,
9726    // Iterate over the document. Supports two forms -- with only one
9727    // argument, it calls that for each line in the document. With
9728    // three, it iterates over the range given by the first two (with
9729    // the second being non-inclusive).
9730    iter: function(from, to, op) {
9731      if (op) this.iterN(from - this.first, to - from, op);
9732      else this.iterN(this.first, this.first + this.size, from);
9733    },
9734
9735    // Non-public interface for adding and removing lines.
9736    insert: function(at, lines) {
9737      var height = 0;
9738      for (var i = 0; i < lines.length; ++i) height += lines[i].height;
9739      this.insertInner(at - this.first, lines, height);
9740    },
9741    remove: function(at, n) { this.removeInner(at - this.first, n); },
9742
9743    // From here, the methods are part of the public interface. Most
9744    // are also available from CodeMirror (editor) instances.
9745
9746    getValue: function(lineSep) {
9747      var lines = getLines(this, this.first, this.first + this.size);
9748      if (lineSep === false) return lines;
9749      return lines.join(lineSep || this.lineSeparator());
9750    },
9751    setValue: docMethodOp(function(code) {
9752      var top = Pos(this.first, 0), last = this.first + this.size - 1;
9753      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
9754                        text: this.splitLines(code), origin: "setValue", full: true}, true);
9755      setSelection(this, simpleSelection(top));
9756    }),
9757    replaceRange: function(code, from, to, origin) {
9758      from = clipPos(this, from);
9759      to = to ? clipPos(this, to) : from;
9760      replaceRange(this, code, from, to, origin);
9761    },
9762    getRange: function(from, to, lineSep) {
9763      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
9764      if (lineSep === false) return lines;
9765      return lines.join(lineSep || this.lineSeparator());
9766    },
9767
9768    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
9769
9770    getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
9771    getLineNumber: function(line) {return lineNo(line);},
9772
9773    getLineHandleVisualStart: function(line) {
9774      if (typeof line == "number") line = getLine(this, line);
9775      return visualLine(line);
9776    },
9777
9778    lineCount: function() {return this.size;},
9779    firstLine: function() {return this.first;},
9780    lastLine: function() {return this.first + this.size - 1;},
9781
9782    clipPos: function(pos) {return clipPos(this, pos);},
9783
9784    getCursor: function(start) {
9785      var range = this.sel.primary(), pos;
9786      if (start == null || start == "head") pos = range.head;
9787      else if (start == "anchor") pos = range.anchor;
9788      else if (start == "end" || start == "to" || start === false) pos = range.to();
9789      else pos = range.from();
9790      return pos;
9791    },
9792    listSelections: function() { return this.sel.ranges; },
9793    somethingSelected: function() {return this.sel.somethingSelected();},
9794
9795    setCursor: docMethodOp(function(line, ch, options) {
9796      setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
9797    }),
9798    setSelection: docMethodOp(function(anchor, head, options) {
9799      setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
9800    }),
9801    extendSelection: docMethodOp(function(head, other, options) {
9802      extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
9803    }),
9804    extendSelections: docMethodOp(function(heads, options) {
9805      extendSelections(this, clipPosArray(this, heads), options);
9806    }),
9807    extendSelectionsBy: docMethodOp(function(f, options) {
9808      var heads = map(this.sel.ranges, f);
9809      extendSelections(this, clipPosArray(this, heads), options);
9810    }),
9811    setSelections: docMethodOp(function(ranges, primary, options) {
9812      if (!ranges.length) return;
9813      for (var i = 0, out = []; i < ranges.length; i++)
9814        out[i] = new Range(clipPos(this, ranges[i].anchor),
9815                           clipPos(this, ranges[i].head));
9816      if (primary == null) primary = Math.min(ranges.length - 1, this.sel.primIndex);
9817      setSelection(this, normalizeSelection(out, primary), options);
9818    }),
9819    addSelection: docMethodOp(function(anchor, head, options) {
9820      var ranges = this.sel.ranges.slice(0);
9821      ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
9822      setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
9823    }),
9824
9825    getSelection: function(lineSep) {
9826      var ranges = this.sel.ranges, lines;
9827      for (var i = 0; i < ranges.length; i++) {
9828        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
9829        lines = lines ? lines.concat(sel) : sel;
9830      }
9831      if (lineSep === false) return lines;
9832      else return lines.join(lineSep || this.lineSeparator());
9833    },
9834    getSelections: function(lineSep) {
9835      var parts = [], ranges = this.sel.ranges;
9836      for (var i = 0; i < ranges.length; i++) {
9837        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
9838        if (lineSep !== false) sel = sel.join(lineSep || this.lineSeparator());
9839        parts[i] = sel;
9840      }
9841      return parts;
9842    },
9843    replaceSelection: function(code, collapse, origin) {
9844      var dup = [];
9845      for (var i = 0; i < this.sel.ranges.length; i++)
9846        dup[i] = code;
9847      this.replaceSelections(dup, collapse, origin || "+input");
9848    },
9849    replaceSelections: docMethodOp(function(code, collapse, origin) {
9850      var changes = [], sel = this.sel;
9851      for (var i = 0; i < sel.ranges.length; i++) {
9852        var range = sel.ranges[i];
9853        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
9854      }
9855      var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
9856      for (var i = changes.length - 1; i >= 0; i--)
9857        makeChange(this, changes[i]);
9858      if (newSel) setSelectionReplaceHistory(this, newSel);
9859      else if (this.cm) ensureCursorVisible(this.cm);
9860    }),
9861    undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
9862    redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
9863    undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
9864    redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),
9865
9866    setExtending: function(val) {this.extend = val;},
9867    getExtending: function() {return this.extend;},
9868
9869    historySize: function() {
9870      var hist = this.history, done = 0, undone = 0;
9871      for (var i = 0; i < hist.done.length; i++) if (!hist.done[i].ranges) ++done;
9872      for (var i = 0; i < hist.undone.length; i++) if (!hist.undone[i].ranges) ++undone;
9873      return {undo: done, redo: undone};
9874    },
9875    clearHistory: function() {this.history = new History(this.history.maxGeneration);},
9876
9877    markClean: function() {
9878      this.cleanGeneration = this.changeGeneration(true);
9879    },
9880    changeGeneration: function(forceSplit) {
9881      if (forceSplit)
9882        this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null;
9883      return this.history.generation;
9884    },
9885    isClean: function (gen) {
9886      return this.history.generation == (gen || this.cleanGeneration);
9887    },
9888
9889    getHistory: function() {
9890      return {done: copyHistoryArray(this.history.done),
9891              undone: copyHistoryArray(this.history.undone)};
9892    },
9893    setHistory: function(histData) {
9894      var hist = this.history = new History(this.history.maxGeneration);
9895      hist.done = copyHistoryArray(histData.done.slice(0), null, true);
9896      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
9897    },
9898
9899    addLineClass: docMethodOp(function(handle, where, cls) {
9900      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
9901        var prop = where == "text" ? "textClass"
9902                 : where == "background" ? "bgClass"
9903                 : where == "gutter" ? "gutterClass" : "wrapClass";
9904        if (!line[prop]) line[prop] = cls;
9905        else if (classTest(cls).test(line[prop])) return false;
9906        else line[prop] += " " + cls;
9907        return true;
9908      });
9909    }),
9910    removeLineClass: docMethodOp(function(handle, where, cls) {
9911      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
9912        var prop = where == "text" ? "textClass"
9913                 : where == "background" ? "bgClass"
9914                 : where == "gutter" ? "gutterClass" : "wrapClass";
9915        var cur = line[prop];
9916        if (!cur) return false;
9917        else if (cls == null) line[prop] = null;
9918        else {
9919          var found = cur.match(classTest(cls));
9920          if (!found) return false;
9921          var end = found.index + found[0].length;
9922          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
9923        }
9924        return true;
9925      });
9926    }),
9927
9928    addLineWidget: docMethodOp(function(handle, node, options) {
9929      return addLineWidget(this, handle, node, options);
9930    }),
9931    removeLineWidget: function(widget) { widget.clear(); },
9932
9933    markText: function(from, to, options) {
9934      return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range");
9935    },
9936    setBookmark: function(pos, options) {
9937      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
9938                      insertLeft: options && options.insertLeft,
9939                      clearWhenEmpty: false, shared: options && options.shared,
9940                      handleMouseEvents: options && options.handleMouseEvents};
9941      pos = clipPos(this, pos);
9942      return markText(this, pos, pos, realOpts, "bookmark");
9943    },
9944    findMarksAt: function(pos) {
9945      pos = clipPos(this, pos);
9946      var markers = [], spans = getLine(this, pos.line).markedSpans;
9947      if (spans) for (var i = 0; i < spans.length; ++i) {
9948        var span = spans[i];
9949        if ((span.from == null || span.from <= pos.ch) &&
9950            (span.to == null || span.to >= pos.ch))
9951          markers.push(span.marker.parent || span.marker);
9952      }
9953      return markers;
9954    },
9955    findMarks: function(from, to, filter) {
9956      from = clipPos(this, from); to = clipPos(this, to);
9957      var found = [], lineNo = from.line;
9958      this.iter(from.line, to.line + 1, function(line) {
9959        var spans = line.markedSpans;
9960        if (spans) for (var i = 0; i < spans.length; i++) {
9961          var span = spans[i];
9962          if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
9963                span.from == null && lineNo != from.line ||
9964                span.from != null && lineNo == to.line && span.from >= to.ch) &&
9965              (!filter || filter(span.marker)))
9966            found.push(span.marker.parent || span.marker);
9967        }
9968        ++lineNo;
9969      });
9970      return found;
9971    },
9972    getAllMarks: function() {
9973      var markers = [];
9974      this.iter(function(line) {
9975        var sps = line.markedSpans;
9976        if (sps) for (var i = 0; i < sps.length; ++i)
9977          if (sps[i].from != null) markers.push(sps[i].marker);
9978      });
9979      return markers;
9980    },
9981
9982    posFromIndex: function(off) {
9983      var ch, lineNo = this.first, sepSize = this.lineSeparator().length;
9984      this.iter(function(line) {
9985        var sz = line.text.length + sepSize;
9986        if (sz > off) { ch = off; return true; }
9987        off -= sz;
9988        ++lineNo;
9989      });
9990      return clipPos(this, Pos(lineNo, ch));
9991    },
9992    indexFromPos: function (coords) {
9993      coords = clipPos(this, coords);
9994      var index = coords.ch;
9995      if (coords.line < this.first || coords.ch < 0) return 0;
9996      var sepSize = this.lineSeparator().length;
9997      this.iter(this.first, coords.line, function (line) {
9998        index += line.text.length + sepSize;
9999      });
10000      return index;
10001    },
10002
10003    copy: function(copyHistory) {
10004      var doc = new Doc(getLines(this, this.first, this.first + this.size),
10005                        this.modeOption, this.first, this.lineSep);
10006      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
10007      doc.sel = this.sel;
10008      doc.extend = false;
10009      if (copyHistory) {
10010        doc.history.undoDepth = this.history.undoDepth;
10011        doc.setHistory(this.getHistory());
10012      }
10013      return doc;
10014    },
10015
10016    linkedDoc: function(options) {
10017      if (!options) options = {};
10018      var from = this.first, to = this.first + this.size;
10019      if (options.from != null && options.from > from) from = options.from;
10020      if (options.to != null && options.to < to) to = options.to;
10021      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep);
10022      if (options.sharedHist) copy.history = this.history;
10023      (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
10024      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
10025      copySharedMarkers(copy, findSharedMarkers(this));
10026      return copy;
10027    },
10028    unlinkDoc: function(other) {
10029      if (other instanceof CodeMirror) other = other.doc;
10030      if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
10031        var link = this.linked[i];
10032        if (link.doc != other) continue;
10033        this.linked.splice(i, 1);
10034        other.unlinkDoc(this);
10035        detachSharedMarkers(findSharedMarkers(this));
10036        break;
10037      }
10038      // If the histories were shared, split them again
10039      if (other.history == this.history) {
10040        var splitIds = [other.id];
10041        linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
10042        other.history = new History(null);
10043        other.history.done = copyHistoryArray(this.history.done, splitIds);
10044        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
10045      }
10046    },
10047    iterLinkedDocs: function(f) {linkedDocs(this, f);},
10048
10049    getMode: function() {return this.mode;},
10050    getEditor: function() {return this.cm;},
10051
10052    splitLines: function(str) {
10053      if (this.lineSep) return str.split(this.lineSep);
10054      return splitLinesAuto(str);
10055    },
10056    lineSeparator: function() { return this.lineSep || "\n"; }
10057  });
10058
10059  // Public alias.
10060  Doc.prototype.eachLine = Doc.prototype.iter;
10061
10062  // Set up methods on CodeMirror's prototype to redirect to the editor's document.
10063  var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
10064  for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
10065    CodeMirror.prototype[prop] = (function(method) {
10066      return function() {return method.apply(this.doc, arguments);};
10067    })(Doc.prototype[prop]);
10068
10069  eventMixin(Doc);
10070
10071  // Call f for all linked documents.
10072  function linkedDocs(doc, f, sharedHistOnly) {
10073    function propagate(doc, skip, sharedHist) {
10074      if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {
10075        var rel = doc.linked[i];
10076        if (rel.doc == skip) continue;
10077        var shared = sharedHist && rel.sharedHist;
10078        if (sharedHistOnly && !shared) continue;
10079        f(rel.doc, shared);
10080        propagate(rel.doc, doc, shared);
10081      }
10082    }
10083    propagate(doc, null, true);
10084  }
10085
10086  // Attach a document to an editor.
10087  function attachDoc(cm, doc) {
10088    if (doc.cm) throw new Error("This document is already in use.");
10089    cm.doc = doc;
10090    doc.cm = cm;
10091    estimateLineHeights(cm);
10092    loadMode(cm);
10093    if (!cm.options.lineWrapping) findMaxLine(cm);
10094    cm.options.mode = doc.modeOption;
10095    regChange(cm);
10096  }
10097
10098  // LINE UTILITIES
10099
10100  // Find the line object corresponding to the given line number.
10101  function getLine(doc, n) {
10102    n -= doc.first;
10103    if (n < 0 || n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.");
10104    for (var chunk = doc; !chunk.lines;) {
10105      for (var i = 0;; ++i) {
10106        var child = chunk.children[i], sz = child.chunkSize();
10107        if (n < sz) { chunk = child; break; }
10108        n -= sz;
10109      }
10110    }
10111    return chunk.lines[n];
10112  }
10113
10114  // Get the part of a document between two positions, as an array of
10115  // strings.
10116  function getBetween(doc, start, end) {
10117    var out = [], n = start.line;
10118    doc.iter(start.line, end.line + 1, function(line) {
10119      var text = line.text;
10120      if (n == end.line) text = text.slice(0, end.ch);
10121      if (n == start.line) text = text.slice(start.ch);
10122      out.push(text);
10123      ++n;
10124    });
10125    return out;
10126  }
10127  // Get the lines between from and to, as array of strings.
10128  function getLines(doc, from, to) {
10129    var out = [];
10130    doc.iter(from, to, function(line) { out.push(line.text); });
10131    return out;
10132  }
10133
10134  // Update the height of a line, propagating the height change
10135  // upwards to parent nodes.
10136  function updateLineHeight(line, height) {
10137    var diff = height - line.height;
10138    if (diff) for (var n = line; n; n = n.parent) n.height += diff;
10139  }
10140
10141  // Given a line object, find its line number by walking up through
10142  // its parent links.
10143  function lineNo(line) {
10144    if (line.parent == null) return null;
10145    var cur = line.parent, no = indexOf(cur.lines, line);
10146    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
10147      for (var i = 0;; ++i) {
10148        if (chunk.children[i] == cur) break;
10149        no += chunk.children[i].chunkSize();
10150      }
10151    }
10152    return no + cur.first;
10153  }
10154
10155  // Find the line at the given vertical position, using the height
10156  // information in the document tree.
10157  function lineAtHeight(chunk, h) {
10158    var n = chunk.first;
10159    outer: do {
10160      for (var i = 0; i < chunk.children.length; ++i) {
10161        var child = chunk.children[i], ch = child.height;
10162        if (h < ch) { chunk = child; continue outer; }
10163        h -= ch;
10164        n += child.chunkSize();
10165      }
10166      return n;
10167    } while (!chunk.lines);
10168    for (var i = 0; i < chunk.lines.length; ++i) {
10169      var line = chunk.lines[i], lh = line.height;
10170      if (h < lh) break;
10171      h -= lh;
10172    }
10173    return n + i;
10174  }
10175
10176
10177  // Find the height above the given line.
10178  function heightAtLine(lineObj) {
10179    lineObj = visualLine(lineObj);
10180
10181    var h = 0, chunk = lineObj.parent;
10182    for (var i = 0; i < chunk.lines.length; ++i) {
10183      var line = chunk.lines[i];
10184      if (line == lineObj) break;
10185      else h += line.height;
10186    }
10187    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
10188      for (var i = 0; i < p.children.length; ++i) {
10189        var cur = p.children[i];
10190        if (cur == chunk) break;
10191        else h += cur.height;
10192      }
10193    }
10194    return h;
10195  }
10196
10197  // Get the bidi ordering for the given line (and cache it). Returns
10198  // false for lines that are fully left-to-right, and an array of
10199  // BidiSpan objects otherwise.
10200  function getOrder(line) {
10201    var order = line.order;
10202    if (order == null) order = line.order = bidiOrdering(line.text);
10203    return order;
10204  }
10205
10206  // HISTORY
10207
10208  function History(startGen) {
10209    // Arrays of change events and selections. Doing something adds an
10210    // event to done and clears undo. Undoing moves events from done
10211    // to undone, redoing moves them in the other direction.
10212    this.done = []; this.undone = [];
10213    this.undoDepth = Infinity;
10214    // Used to track when changes can be merged into a single undo
10215    // event
10216    this.lastModTime = this.lastSelTime = 0;
10217    this.lastOp = this.lastSelOp = null;
10218    this.lastOrigin = this.lastSelOrigin = null;
10219    // Used by the isClean() method
10220    this.generation = this.maxGeneration = startGen || 1;
10221  }
10222
10223  // Create a history change event from an updateDoc-style change
10224  // object.
10225  function historyChangeFromChange(doc, change) {
10226    var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
10227    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
10228    linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);
10229    return histChange;
10230  }
10231
10232  // Pop all selection events off the end of a history array. Stop at
10233  // a change event.
10234  function clearSelectionEvents(array) {
10235    while (array.length) {
10236      var last = lst(array);
10237      if (last.ranges) array.pop();
10238      else break;
10239    }
10240  }
10241
10242  // Find the top change event in the history. Pop off selection
10243  // events that are in the way.
10244  function lastChangeEvent(hist, force) {
10245    if (force) {
10246      clearSelectionEvents(hist.done);
10247      return lst(hist.done);
10248    } else if (hist.done.length && !lst(hist.done).ranges) {
10249      return lst(hist.done);
10250    } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
10251      hist.done.pop();
10252      return lst(hist.done);
10253    }
10254  }
10255
10256  // Register a change in the history. Merges changes that are within
10257  // a single operation, ore are close together with an origin that
10258  // allows merging (starting with "+") into a single event.
10259  function addChangeToHistory(doc, change, selAfter, opId) {
10260    var hist = doc.history;
10261    hist.undone.length = 0;
10262    var time = +new Date, cur;
10263
10264    if ((hist.lastOp == opId ||
10265         hist.lastOrigin == change.origin && change.origin &&
10266         ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
10267          change.origin.charAt(0) == "*")) &&
10268        (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
10269      // Merge this change into the last event
10270      var last = lst(cur.changes);
10271      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
10272        // Optimized case for simple insertion -- don't want to add
10273        // new changesets for every character typed
10274        last.to = changeEnd(change);
10275      } else {
10276        // Add new sub-event
10277        cur.changes.push(historyChangeFromChange(doc, change));
10278      }
10279    } else {
10280      // Can not be merged, start a new event.
10281      var before = lst(hist.done);
10282      if (!before || !before.ranges)
10283        pushSelectionToHistory(doc.sel, hist.done);
10284      cur = {changes: [historyChangeFromChange(doc, change)],
10285             generation: hist.generation};
10286      hist.done.push(cur);
10287      while (hist.done.length > hist.undoDepth) {
10288        hist.done.shift();
10289        if (!hist.done[0].ranges) hist.done.shift();
10290      }
10291    }
10292    hist.done.push(selAfter);
10293    hist.generation = ++hist.maxGeneration;
10294    hist.lastModTime = hist.lastSelTime = time;
10295    hist.lastOp = hist.lastSelOp = opId;
10296    hist.lastOrigin = hist.lastSelOrigin = change.origin;
10297
10298    if (!last) signal(doc, "historyAdded");
10299  }
10300
10301  function selectionEventCanBeMerged(doc, origin, prev, sel) {
10302    var ch = origin.charAt(0);
10303    return ch == "*" ||
10304      ch == "+" &&
10305      prev.ranges.length == sel.ranges.length &&
10306      prev.somethingSelected() == sel.somethingSelected() &&
10307      new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500);
10308  }
10309
10310  // Called whenever the selection changes, sets the new selection as
10311  // the pending selection in the history, and pushes the old pending
10312  // selection into the 'done' array when it was significantly
10313  // different (in number of selected ranges, emptiness, or time).
10314  function addSelectionToHistory(doc, sel, opId, options) {
10315    var hist = doc.history, origin = options && options.origin;
10316
10317    // A new event is started when the previous origin does not match
10318    // the current, or the origins don't allow matching. Origins
10319    // starting with * are always merged, those starting with + are
10320    // merged when similar and close together in time.
10321    if (opId == hist.lastSelOp ||
10322        (origin && hist.lastSelOrigin == origin &&
10323         (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
10324          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
10325      hist.done[hist.done.length - 1] = sel;
10326    else
10327      pushSelectionToHistory(sel, hist.done);
10328
10329    hist.lastSelTime = +new Date;
10330    hist.lastSelOrigin = origin;
10331    hist.lastSelOp = opId;
10332    if (options && options.clearRedo !== false)
10333      clearSelectionEvents(hist.undone);
10334  }
10335
10336  function pushSelectionToHistory(sel, dest) {
10337    var top = lst(dest);
10338    if (!(top && top.ranges && top.equals(sel)))
10339      dest.push(sel);
10340  }
10341
10342  // Used to store marked span information in the history.
10343  function attachLocalSpans(doc, change, from, to) {
10344    var existing = change["spans_" + doc.id], n = 0;
10345    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
10346      if (line.markedSpans)
10347        (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
10348      ++n;
10349    });
10350  }
10351
10352  // When un/re-doing restores text containing marked spans, those
10353  // that have been explicitly cleared should not be restored.
10354  function removeClearedSpans(spans) {
10355    if (!spans) return null;
10356    for (var i = 0, out; i < spans.length; ++i) {
10357      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
10358      else if (out) out.push(spans[i]);
10359    }
10360    return !out ? spans : out.length ? out : null;
10361  }
10362
10363  // Retrieve and filter the old marked spans stored in a change event.
10364  function getOldSpans(doc, change) {
10365    var found = change["spans_" + doc.id];
10366    if (!found) return null;
10367    for (var i = 0, nw = []; i < change.text.length; ++i)
10368      nw.push(removeClearedSpans(found[i]));
10369    return nw;
10370  }
10371
10372  // Used both to provide a JSON-safe object in .getHistory, and, when
10373  // detaching a document, to split the history in two
10374  function copyHistoryArray(events, newGroup, instantiateSel) {
10375    for (var i = 0, copy = []; i < events.length; ++i) {
10376      var event = events[i];
10377      if (event.ranges) {
10378        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
10379        continue;
10380      }
10381      var changes = event.changes, newChanges = [];
10382      copy.push({changes: newChanges});
10383      for (var j = 0; j < changes.length; ++j) {
10384        var change = changes[j], m;
10385        newChanges.push({from: change.from, to: change.to, text: change.text});
10386        if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
10387          if (indexOf(newGroup, Number(m[1])) > -1) {
10388            lst(newChanges)[prop] = change[prop];
10389            delete change[prop];
10390          }
10391        }
10392      }
10393    }
10394    return copy;
10395  }
10396
10397  // Rebasing/resetting history to deal with externally-sourced changes
10398
10399  function rebaseHistSelSingle(pos, from, to, diff) {
10400    if (to < pos.line) {
10401      pos.line += diff;
10402    } else if (from < pos.line) {
10403      pos.line = from;
10404      pos.ch = 0;
10405    }
10406  }
10407
10408  // Tries to rebase an array of history events given a change in the
10409  // document. If the change touches the same lines as the event, the
10410  // event, and everything 'behind' it, is discarded. If the change is
10411  // before the event, the event's positions are updated. Uses a
10412  // copy-on-write scheme for the positions, to avoid having to
10413  // reallocate them all on every rebase, but also avoid problems with
10414  // shared position objects being unsafely updated.
10415  function rebaseHistArray(array, from, to, diff) {
10416    for (var i = 0; i < array.length; ++i) {
10417      var sub = array[i], ok = true;
10418      if (sub.ranges) {
10419        if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
10420        for (var j = 0; j < sub.ranges.length; j++) {
10421          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
10422          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
10423        }
10424        continue;
10425      }
10426      for (var j = 0; j < sub.changes.length; ++j) {
10427        var cur = sub.changes[j];
10428        if (to < cur.from.line) {
10429          cur.from = Pos(cur.from.line + diff, cur.from.ch);
10430          cur.to = Pos(cur.to.line + diff, cur.to.ch);
10431        } else if (from <= cur.to.line) {
10432          ok = false;
10433          break;
10434        }
10435      }
10436      if (!ok) {
10437        array.splice(0, i + 1);
10438        i = 0;
10439      }
10440    }
10441  }
10442
10443  function rebaseHist(hist, change) {
10444    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
10445    rebaseHistArray(hist.done, from, to, diff);
10446    rebaseHistArray(hist.undone, from, to, diff);
10447  }
10448
10449  // EVENT UTILITIES
10450
10451  // Due to the fact that we still support jurassic IE versions, some
10452  // compatibility wrappers are needed.
10453
10454  var e_preventDefault = CodeMirror.e_preventDefault = function(e) {
10455    if (e.preventDefault) e.preventDefault();
10456    else e.returnValue = false;
10457  };
10458  var e_stopPropagation = CodeMirror.e_stopPropagation = function(e) {
10459    if (e.stopPropagation) e.stopPropagation();
10460    else e.cancelBubble = true;
10461  };
10462  function e_defaultPrevented(e) {
10463    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;
10464  }
10465  var e_stop = CodeMirror.e_stop = function(e) {e_preventDefault(e); e_stopPropagation(e);};
10466
10467  function e_target(e) {return e.target || e.srcElement;}
10468  function e_button(e) {
10469    var b = e.which;
10470    if (b == null) {
10471      if (e.button & 1) b = 1;
10472      else if (e.button & 2) b = 3;
10473      else if (e.button & 4) b = 2;
10474    }
10475    if (mac && e.ctrlKey && b == 1) b = 3;
10476    return b;
10477  }
10478
10479  // EVENT HANDLING
10480
10481  // Lightweight event framework. on/off also work on DOM nodes,
10482  // registering native DOM handlers.
10483
10484  var on = CodeMirror.on = function(emitter, type, f) {
10485    if (emitter.addEventListener)
10486      emitter.addEventListener(type, f, false);
10487    else if (emitter.attachEvent)
10488      emitter.attachEvent("on" + type, f);
10489    else {
10490      var map = emitter._handlers || (emitter._handlers = {});
10491      var arr = map[type] || (map[type] = []);
10492      arr.push(f);
10493    }
10494  };
10495
10496  var noHandlers = []
10497  function getHandlers(emitter, type, copy) {
10498    var arr = emitter._handlers && emitter._handlers[type]
10499    if (copy) return arr && arr.length > 0 ? arr.slice() : noHandlers
10500    else return arr || noHandlers
10501  }
10502
10503  var off = CodeMirror.off = function(emitter, type, f) {
10504    if (emitter.removeEventListener)
10505      emitter.removeEventListener(type, f, false);
10506    else if (emitter.detachEvent)
10507      emitter.detachEvent("on" + type, f);
10508    else {
10509      var handlers = getHandlers(emitter, type, false)
10510      for (var i = 0; i < handlers.length; ++i)
10511        if (handlers[i] == f) { handlers.splice(i, 1); break; }
10512    }
10513  };
10514
10515  var signal = CodeMirror.signal = function(emitter, type /*, values...*/) {
10516    var handlers = getHandlers(emitter, type, true)
10517    if (!handlers.length) return;
10518    var args = Array.prototype.slice.call(arguments, 2);
10519    for (var i = 0; i < handlers.length; ++i) handlers[i].apply(null, args);
10520  };
10521
10522  var orphanDelayedCallbacks = null;
10523
10524  // Often, we want to signal events at a point where we are in the
10525  // middle of some work, but don't want the handler to start calling
10526  // other methods on the editor, which might be in an inconsistent
10527  // state or simply not expect any other events to happen.
10528  // signalLater looks whether there are any handlers, and schedules
10529  // them to be executed when the last operation ends, or, if no
10530  // operation is active, when a timeout fires.
10531  function signalLater(emitter, type /*, values...*/) {
10532    var arr = getHandlers(emitter, type, false)
10533    if (!arr.length) return;
10534    var args = Array.prototype.slice.call(arguments, 2), list;
10535    if (operationGroup) {
10536      list = operationGroup.delayedCallbacks;
10537    } else if (orphanDelayedCallbacks) {
10538      list = orphanDelayedCallbacks;
10539    } else {
10540      list = orphanDelayedCallbacks = [];
10541      setTimeout(fireOrphanDelayed, 0);
10542    }
10543    function bnd(f) {return function(){f.apply(null, args);};};
10544    for (var i = 0; i < arr.length; ++i)
10545      list.push(bnd(arr[i]));
10546  }
10547
10548  function fireOrphanDelayed() {
10549    var delayed = orphanDelayedCallbacks;
10550    orphanDelayedCallbacks = null;
10551    for (var i = 0; i < delayed.length; ++i) delayed[i]();
10552  }
10553
10554  // The DOM events that CodeMirror handles can be overridden by
10555  // registering a (non-DOM) handler on the editor for the event name,
10556  // and preventDefault-ing the event in that handler.
10557  function signalDOMEvent(cm, e, override) {
10558    if (typeof e == "string")
10559      e = {type: e, preventDefault: function() { this.defaultPrevented = true; }};
10560    signal(cm, override || e.type, cm, e);
10561    return e_defaultPrevented(e) || e.codemirrorIgnore;
10562  }
10563
10564  function signalCursorActivity(cm) {
10565    var arr = cm._handlers && cm._handlers.cursorActivity;
10566    if (!arr) return;
10567    var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
10568    for (var i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
10569      set.push(arr[i]);
10570  }
10571
10572  function hasHandler(emitter, type) {
10573    return getHandlers(emitter, type).length > 0
10574  }
10575
10576  // Add on and off methods to a constructor's prototype, to make
10577  // registering events on such objects more convenient.
10578  function eventMixin(ctor) {
10579    ctor.prototype.on = function(type, f) {on(this, type, f);};
10580    ctor.prototype.off = function(type, f) {off(this, type, f);};
10581  }
10582
10583  // MISC UTILITIES
10584
10585  // Number of pixels added to scroller and sizer to hide scrollbar
10586  var scrollerGap = 30;
10587
10588  // Returned or thrown by various protocols to signal 'I'm not
10589  // handling this'.
10590  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
10591
10592  // Reused option objects for setSelection & friends
10593  var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};
10594
10595  function Delayed() {this.id = null;}
10596  Delayed.prototype.set = function(ms, f) {
10597    clearTimeout(this.id);
10598    this.id = setTimeout(f, ms);
10599  };
10600
10601  // Counts the column offset in a string, taking tabs into account.
10602  // Used mostly to find indentation.
10603  var countColumn = CodeMirror.countColumn = function(string, end, tabSize, startIndex, startValue) {
10604    if (end == null) {
10605      end = string.search(/[^\s\u00a0]/);
10606      if (end == -1) end = string.length;
10607    }
10608    for (var i = startIndex || 0, n = startValue || 0;;) {
10609      var nextTab = string.indexOf("\t", i);
10610      if (nextTab < 0 || nextTab >= end)
10611        return n + (end - i);
10612      n += nextTab - i;
10613      n += tabSize - (n % tabSize);
10614      i = nextTab + 1;
10615    }
10616  };
10617
10618  // The inverse of countColumn -- find the offset that corresponds to
10619  // a particular column.
10620  var findColumn = CodeMirror.findColumn = function(string, goal, tabSize) {
10621    for (var pos = 0, col = 0;;) {
10622      var nextTab = string.indexOf("\t", pos);
10623      if (nextTab == -1) nextTab = string.length;
10624      var skipped = nextTab - pos;
10625      if (nextTab == string.length || col + skipped >= goal)
10626        return pos + Math.min(skipped, goal - col);
10627      col += nextTab - pos;
10628      col += tabSize - (col % tabSize);
10629      pos = nextTab + 1;
10630      if (col >= goal) return pos;
10631    }
10632  }
10633
10634  var spaceStrs = [""];
10635  function spaceStr(n) {
10636    while (spaceStrs.length <= n)
10637      spaceStrs.push(lst(spaceStrs) + " ");
10638    return spaceStrs[n];
10639  }
10640
10641  function lst(arr) { return arr[arr.length-1]; }
10642
10643  var selectInput = function(node) { node.select(); };
10644  if (ios) // Mobile Safari apparently has a bug where select() is broken.
10645    selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; };
10646  else if (ie) // Suppress mysterious IE10 errors
10647    selectInput = function(node) { try { node.select(); } catch(_e) {} };
10648
10649  function indexOf(array, elt) {
10650    for (var i = 0; i < array.length; ++i)
10651      if (array[i] == elt) return i;
10652    return -1;
10653  }
10654  function map(array, f) {
10655    var out = [];
10656    for (var i = 0; i < array.length; i++) out[i] = f(array[i], i);
10657    return out;
10658  }
10659
10660  function nothing() {}
10661
10662  function createObj(base, props) {
10663    var inst;
10664    if (Object.create) {
10665      inst = Object.create(base);
10666    } else {
10667      nothing.prototype = base;
10668      inst = new nothing();
10669    }
10670    if (props) copyObj(props, inst);
10671    return inst;
10672  };
10673
10674  function copyObj(obj, target, overwrite) {
10675    if (!target) target = {};
10676    for (var prop in obj)
10677      if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
10678        target[prop] = obj[prop];
10679    return target;
10680  }
10681
10682  function bind(f) {
10683    var args = Array.prototype.slice.call(arguments, 1);
10684    return function(){return f.apply(null, args);};
10685  }
10686
10687  var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
10688  var isWordCharBasic = CodeMirror.isWordChar = function(ch) {
10689    return /\w/.test(ch) || ch > "\x80" &&
10690      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
10691  };
10692  function isWordChar(ch, helper) {
10693    if (!helper) return isWordCharBasic(ch);
10694    if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) return true;
10695    return helper.test(ch);
10696  }
10697
10698  function isEmpty(obj) {
10699    for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
10700    return true;
10701  }
10702
10703  // Extending unicode characters. A series of a non-extending char +
10704  // any number of extending chars is treated as a single unit as far
10705  // as editing and measuring is concerned. This is not fully correct,
10706  // since some scripts/fonts/browsers also treat other configurations
10707  // of code points as a group.
10708  var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
10709  function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch); }
10710
10711  // DOM UTILITIES
10712
10713  function elt(tag, content, className, style) {
10714    var e = document.createElement(tag);
10715    if (className) e.className = className;
10716    if (style) e.style.cssText = style;
10717    if (typeof content == "string") e.appendChild(document.createTextNode(content));
10718    else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
10719    return e;
10720  }
10721
10722  var range;
10723  if (document.createRange) range = function(node, start, end, endNode) {
10724    var r = document.createRange();
10725    r.setEnd(endNode || node, end);
10726    r.setStart(node, start);
10727    return r;
10728  };
10729  else range = function(node, start, end) {
10730    var r = document.body.createTextRange();
10731    try { r.moveToElementText(node.parentNode); }
10732    catch(e) { return r; }
10733    r.collapse(true);
10734    r.moveEnd("character", end);
10735    r.moveStart("character", start);
10736    return r;
10737  };
10738
10739  function removeChildren(e) {
10740    for (var count = e.childNodes.length; count > 0; --count)
10741      e.removeChild(e.firstChild);
10742    return e;
10743  }
10744
10745  function removeChildrenAndAdd(parent, e) {
10746    return removeChildren(parent).appendChild(e);
10747  }
10748
10749  var contains = CodeMirror.contains = function(parent, child) {
10750    if (child.nodeType == 3) // Android browser always returns false when child is a textnode
10751      child = child.parentNode;
10752    if (parent.contains)
10753      return parent.contains(child);
10754    do {
10755      if (child.nodeType == 11) child = child.host;
10756      if (child == parent) return true;
10757    } while (child = child.parentNode);
10758  };
10759
10760  function activeElt() {
10761    var activeElement = document.activeElement;
10762    while (activeElement && activeElement.root && activeElement.root.activeElement)
10763      activeElement = activeElement.root.activeElement;
10764    return activeElement;
10765  }
10766  // Older versions of IE throws unspecified error when touching
10767  // document.activeElement in some cases (during loading, in iframe)
10768  if (ie && ie_version < 11) activeElt = function() {
10769    try { return document.activeElement; }
10770    catch(e) { return document.body; }
10771  };
10772
10773  function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*"); }
10774  var rmClass = CodeMirror.rmClass = function(node, cls) {
10775    var current = node.className;
10776    var match = classTest(cls).exec(current);
10777    if (match) {
10778      var after = current.slice(match.index + match[0].length);
10779      node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
10780    }
10781  };
10782  var addClass = CodeMirror.addClass = function(node, cls) {
10783    var current = node.className;
10784    if (!classTest(cls).test(current)) node.className += (current ? " " : "") + cls;
10785  };
10786  function joinClasses(a, b) {
10787    var as = a.split(" ");
10788    for (var i = 0; i < as.length; i++)
10789      if (as[i] && !classTest(as[i]).test(b)) b += " " + as[i];
10790    return b;
10791  }
10792
10793  // WINDOW-WIDE EVENTS
10794
10795  // These must be handled carefully, because naively registering a
10796  // handler for each editor will cause the editors to never be
10797  // garbage collected.
10798
10799  function forEachCodeMirror(f) {
10800    if (!document.body.getElementsByClassName) return;
10801    var byClass = document.body.getElementsByClassName("CodeMirror");
10802    for (var i = 0; i < byClass.length; i++) {
10803      var cm = byClass[i].CodeMirror;
10804      if (cm) f(cm);
10805    }
10806  }
10807
10808  var globalsRegistered = false;
10809  function ensureGlobalHandlers() {
10810    if (globalsRegistered) return;
10811    registerGlobalHandlers();
10812    globalsRegistered = true;
10813  }
10814  function registerGlobalHandlers() {
10815    // When the window resizes, we need to refresh active editors.
10816    var resizeTimer;
10817    on(window, "resize", function() {
10818      if (resizeTimer == null) resizeTimer = setTimeout(function() {
10819        resizeTimer = null;
10820        forEachCodeMirror(onResize);
10821      }, 100);
10822    });
10823    // When the window loses focus, we want to show the editor as blurred
10824    on(window, "blur", function() {
10825      forEachCodeMirror(onBlur);
10826    });
10827  }
10828
10829  // FEATURE DETECTION
10830
10831  // Detect drag-and-drop
10832  var dragAndDrop = function() {
10833    // There is *some* kind of drag-and-drop support in IE6-8, but I
10834    // couldn't get it to work yet.
10835    if (ie && ie_version < 9) return false;
10836    var div = elt('div');
10837    return "draggable" in div || "dragDrop" in div;
10838  }();
10839
10840  var zwspSupported;
10841  function zeroWidthElement(measure) {
10842    if (zwspSupported == null) {
10843      var test = elt("span", "\u200b");
10844      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
10845      if (measure.firstChild.offsetHeight != 0)
10846        zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
10847    }
10848    var node = zwspSupported ? elt("span", "\u200b") :
10849      elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
10850    node.setAttribute("cm-text", "");
10851    return node;
10852  }
10853
10854  // Feature-detect IE's crummy client rect reporting for bidi text
10855  var badBidiRects;
10856  function hasBadBidiRects(measure) {
10857    if (badBidiRects != null) return badBidiRects;
10858    var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
10859    var r0 = range(txt, 0, 1).getBoundingClientRect();
10860    if (!r0 || r0.left == r0.right) return false; // Safari returns null in some cases (#2780)
10861    var r1 = range(txt, 1, 2).getBoundingClientRect();
10862    return badBidiRects = (r1.right - r0.right < 3);
10863  }
10864
10865  // See if "".split is the broken IE version, if so, provide an
10866  // alternative way to split lines.
10867  var splitLinesAuto = CodeMirror.splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
10868    var pos = 0, result = [], l = string.length;
10869    while (pos <= l) {
10870      var nl = string.indexOf("\n", pos);
10871      if (nl == -1) nl = string.length;
10872      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
10873      var rt = line.indexOf("\r");
10874      if (rt != -1) {
10875        result.push(line.slice(0, rt));
10876        pos += rt + 1;
10877      } else {
10878        result.push(line);
10879        pos = nl + 1;
10880      }
10881    }
10882    return result;
10883  } : function(string){return string.split(/\r\n?|\n/);};
10884
10885  var hasSelection = window.getSelection ? function(te) {
10886    try { return te.selectionStart != te.selectionEnd; }
10887    catch(e) { return false; }
10888  } : function(te) {
10889    try {var range = te.ownerDocument.selection.createRange();}
10890    catch(e) {}
10891    if (!range || range.parentElement() != te) return false;
10892    return range.compareEndPoints("StartToEnd", range) != 0;
10893  };
10894
10895  var hasCopyEvent = (function() {
10896    var e = elt("div");
10897    if ("oncopy" in e) return true;
10898    e.setAttribute("oncopy", "return;");
10899    return typeof e.oncopy == "function";
10900  })();
10901
10902  var badZoomedRects = null;
10903  function hasBadZoomedRects(measure) {
10904    if (badZoomedRects != null) return badZoomedRects;
10905    var node = removeChildrenAndAdd(measure, elt("span", "x"));
10906    var normal = node.getBoundingClientRect();
10907    var fromRange = range(node, 0, 1).getBoundingClientRect();
10908    return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1;
10909  }
10910
10911  // KEY NAMES
10912
10913  var keyNames = CodeMirror.keyNames = {
10914    3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
10915    19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
10916    36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
10917    46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
10918    106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete",
10919    173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
10920    221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
10921    63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
10922  };
10923  (function() {
10924    // Number keys
10925    for (var i = 0; i < 10; i++) keyNames[i + 48] = keyNames[i + 96] = String(i);
10926    // Alphabetic keys
10927    for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
10928    // Function keys
10929    for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
10930  })();
10931
10932  // BIDI HELPERS
10933
10934  function iterateBidiSections(order, from, to, f) {
10935    if (!order) return f(from, to, "ltr");
10936    var found = false;
10937    for (var i = 0; i < order.length; ++i) {
10938      var part = order[i];
10939      if (part.from < to && part.to > from || from == to && part.to == from) {
10940        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
10941        found = true;
10942      }
10943    }
10944    if (!found) f(from, to, "ltr");
10945  }
10946
10947  function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }
10948  function bidiRight(part) { return part.level % 2 ? part.from : part.to; }
10949
10950  function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }
10951  function lineRight(line) {
10952    var order = getOrder(line);
10953    if (!order) return line.text.length;
10954    return bidiRight(lst(order));
10955  }
10956
10957  function lineStart(cm, lineN) {
10958    var line = getLine(cm.doc, lineN);
10959    var visual = visualLine(line);
10960    if (visual != line) lineN = lineNo(visual);
10961    var order = getOrder(visual);
10962    var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);
10963    return Pos(lineN, ch);
10964  }
10965  function lineEnd(cm, lineN) {
10966    var merged, line = getLine(cm.doc, lineN);
10967    while (merged = collapsedSpanAtEnd(line)) {
10968      line = merged.find(1, true).line;
10969      lineN = null;
10970    }
10971    var order = getOrder(line);
10972    var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
10973    return Pos(lineN == null ? lineNo(line) : lineN, ch);
10974  }
10975  function lineStartSmart(cm, pos) {
10976    var start = lineStart(cm, pos.line);
10977    var line = getLine(cm.doc, start.line);
10978    var order = getOrder(line);
10979    if (!order || order[0].level == 0) {
10980      var firstNonWS = Math.max(0, line.text.search(/\S/));
10981      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
10982      return Pos(start.line, inWS ? 0 : firstNonWS);
10983    }
10984    return start;
10985  }
10986
10987  function compareBidiLevel(order, a, b) {
10988    var linedir = order[0].level;
10989    if (a == linedir) return true;
10990    if (b == linedir) return false;
10991    return a < b;
10992  }
10993  var bidiOther;
10994  function getBidiPartAt(order, pos) {
10995    bidiOther = null;
10996    for (var i = 0, found; i < order.length; ++i) {
10997      var cur = order[i];
10998      if (cur.from < pos && cur.to > pos) return i;
10999      if ((cur.from == pos || cur.to == pos)) {
11000        if (found == null) {
11001          found = i;
11002        } else if (compareBidiLevel(order, cur.level, order[found].level)) {
11003          if (cur.from != cur.to) bidiOther = found;
11004          return i;
11005        } else {
11006          if (cur.from != cur.to) bidiOther = i;
11007          return found;
11008        }
11009      }
11010    }
11011    return found;
11012  }
11013
11014  function moveInLine(line, pos, dir, byUnit) {
11015    if (!byUnit) return pos + dir;
11016    do pos += dir;
11017    while (pos > 0 && isExtendingChar(line.text.charAt(pos)));
11018    return pos;
11019  }
11020
11021  // This is needed in order to move 'visually' through bi-directional
11022  // text -- i.e., pressing left should make the cursor go left, even
11023  // when in RTL text. The tricky part is the 'jumps', where RTL and
11024  // LTR text touch each other. This often requires the cursor offset
11025  // to move more than one unit, in order to visually move one unit.
11026  function moveVisually(line, start, dir, byUnit) {
11027    var bidi = getOrder(line);
11028    if (!bidi) return moveLogically(line, start, dir, byUnit);
11029    var pos = getBidiPartAt(bidi, start), part = bidi[pos];
11030    var target = moveInLine(line, start, part.level % 2 ? -dir : dir, byUnit);
11031
11032    for (;;) {
11033      if (target > part.from && target < part.to) return target;
11034      if (target == part.from || target == part.to) {
11035        if (getBidiPartAt(bidi, target) == pos) return target;
11036        part = bidi[pos += dir];
11037        return (dir > 0) == part.level % 2 ? part.to : part.from;
11038      } else {
11039        part = bidi[pos += dir];
11040        if (!part) return null;
11041        if ((dir > 0) == part.level % 2)
11042          target = moveInLine(line, part.to, -1, byUnit);
11043        else
11044          target = moveInLine(line, part.from, 1, byUnit);
11045      }
11046    }
11047  }
11048
11049  function moveLogically(line, start, dir, byUnit) {
11050    var target = start + dir;
11051    if (byUnit) while (target > 0 && isExtendingChar(line.text.charAt(target))) target += dir;
11052    return target < 0 || target > line.text.length ? null : target;
11053  }
11054
11055  // Bidirectional ordering algorithm
11056  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
11057  // that this (partially) implements.
11058
11059  // One-char codes used for character types:
11060  // L (L):   Left-to-Right
11061  // R (R):   Right-to-Left
11062  // r (AL):  Right-to-Left Arabic
11063  // 1 (EN):  European Number
11064  // + (ES):  European Number Separator
11065  // % (ET):  European Number Terminator
11066  // n (AN):  Arabic Number
11067  // , (CS):  Common Number Separator
11068  // m (NSM): Non-Spacing Mark
11069  // b (BN):  Boundary Neutral
11070  // s (B):   Paragraph Separator
11071  // t (S):   Segment Separator
11072  // w (WS):  Whitespace
11073  // N (ON):  Other Neutrals
11074
11075  // Returns null if characters are ordered as they appear
11076  // (left-to-right), or an array of sections ({from, to, level}
11077  // objects) in the order in which they occur visually.
11078  var bidiOrdering = (function() {
11079    // Character types for codepoints 0 to 0xff
11080    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
11081    // Character types for codepoints 0x600 to 0x6ff
11082    var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmm";
11083    function charType(code) {
11084      if (code <= 0xf7) return lowTypes.charAt(code);
11085      else if (0x590 <= code && code <= 0x5f4) return "R";
11086      else if (0x600 <= code && code <= 0x6ed) return arabicTypes.charAt(code - 0x600);
11087      else if (0x6ee <= code && code <= 0x8ac) return "r";
11088      else if (0x2000 <= code && code <= 0x200b) return "w";
11089      else if (code == 0x200c) return "b";
11090      else return "L";
11091    }
11092
11093    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
11094    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
11095    // Browsers seem to always treat the boundaries of block elements as being L.
11096    var outerType = "L";
11097
11098    function BidiSpan(level, from, to) {
11099      this.level = level;
11100      this.from = from; this.to = to;
11101    }
11102
11103    return function(str) {
11104      if (!bidiRE.test(str)) return false;
11105      var len = str.length, types = [];
11106      for (var i = 0, type; i < len; ++i)
11107        types.push(type = charType(str.charCodeAt(i)));
11108
11109      // W1. Examine each non-spacing mark (NSM) in the level run, and
11110      // change the type of the NSM to the type of the previous
11111      // character. If the NSM is at the start of the level run, it will
11112      // get the type of sor.
11113      for (var i = 0, prev = outerType; i < len; ++i) {
11114        var type = types[i];
11115        if (type == "m") types[i] = prev;
11116        else prev = type;
11117      }
11118
11119      // W2. Search backwards from each instance of a European number
11120      // until the first strong type (R, L, AL, or sor) is found. If an
11121      // AL is found, change the type of the European number to Arabic
11122      // number.
11123      // W3. Change all ALs to R.
11124      for (var i = 0, cur = outerType; i < len; ++i) {
11125        var type = types[i];
11126        if (type == "1" && cur == "r") types[i] = "n";
11127        else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }
11128      }
11129
11130      // W4. A single European separator between two European numbers
11131      // changes to a European number. A single common separator between
11132      // two numbers of the same type changes to that type.
11133      for (var i = 1, prev = types[0]; i < len - 1; ++i) {
11134        var type = types[i];
11135        if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";
11136        else if (type == "," && prev == types[i+1] &&
11137                 (prev == "1" || prev == "n")) types[i] = prev;
11138        prev = type;
11139      }
11140
11141      // W5. A sequence of European terminators adjacent to European
11142      // numbers changes to all European numbers.
11143      // W6. Otherwise, separators and terminators change to Other
11144      // Neutral.
11145      for (var i = 0; i < len; ++i) {
11146        var type = types[i];
11147        if (type == ",") types[i] = "N";
11148        else if (type == "%") {
11149          for (var end = i + 1; end < len && types[end] == "%"; ++end) {}
11150          var replace = (i && types[i-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
11151          for (var j = i; j < end; ++j) types[j] = replace;
11152          i = end - 1;
11153        }
11154      }
11155
11156      // W7. Search backwards from each instance of a European number
11157      // until the first strong type (R, L, or sor) is found. If an L is
11158      // found, then change the type of the European number to L.
11159      for (var i = 0, cur = outerType; i < len; ++i) {
11160        var type = types[i];
11161        if (cur == "L" && type == "1") types[i] = "L";
11162        else if (isStrong.test(type)) cur = type;
11163      }
11164
11165      // N1. A sequence of neutrals takes the direction of the
11166      // surrounding strong text if the text on both sides has the same
11167      // direction. European and Arabic numbers act as if they were R in
11168      // terms of their influence on neutrals. Start-of-level-run (sor)
11169      // and end-of-level-run (eor) are used at level run boundaries.
11170      // N2. Any remaining neutrals take the embedding direction.
11171      for (var i = 0; i < len; ++i) {
11172        if (isNeutral.test(types[i])) {
11173          for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}
11174          var before = (i ? types[i-1] : outerType) == "L";
11175          var after = (end < len ? types[end] : outerType) == "L";
11176          var replace = before || after ? "L" : "R";
11177          for (var j = i; j < end; ++j) types[j] = replace;
11178          i = end - 1;
11179        }
11180      }
11181
11182      // Here we depart from the documented algorithm, in order to avoid
11183      // building up an actual levels array. Since there are only three
11184      // levels (0, 1, 2) in an implementation that doesn't take
11185      // explicit embedding into account, we can build up the order on
11186      // the fly, without following the level-based algorithm.
11187      var order = [], m;
11188      for (var i = 0; i < len;) {
11189        if (countsAsLeft.test(types[i])) {
11190          var start = i;
11191          for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}
11192          order.push(new BidiSpan(0, start, i));
11193        } else {
11194          var pos = i, at = order.length;
11195          for (++i; i < len && types[i] != "L"; ++i) {}
11196          for (var j = pos; j < i;) {
11197            if (countsAsNum.test(types[j])) {
11198              if (pos < j) order.splice(at, 0, new BidiSpan(1, pos, j));
11199              var nstart = j;
11200              for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
11201              order.splice(at, 0, new BidiSpan(2, nstart, j));
11202              pos = j;
11203            } else ++j;
11204          }
11205          if (pos < i) order.splice(at, 0, new BidiSpan(1, pos, i));
11206        }
11207      }
11208      if (order[0].level == 1 && (m = str.match(/^\s+/))) {
11209        order[0].from = m[0].length;
11210        order.unshift(new BidiSpan(0, 0, m[0].length));
11211      }
11212      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
11213        lst(order).to -= m[0].length;
11214        order.push(new BidiSpan(0, len - m[0].length, len));
11215      }
11216      if (order[0].level == 2)
11217        order.unshift(new BidiSpan(1, order[0].to, order[0].to));
11218      if (order[0].level != lst(order).level)
11219        order.push(new BidiSpan(order[0].level, len, len));
11220
11221      return order;
11222    };
11223  })();
11224
11225  // THE END
11226
11227  CodeMirror.version = "5.15.2";
11228
11229  return CodeMirror;
11230});
11231
11232},{}],11:[function(require,module,exports){
11233// CodeMirror, copyright (c) by Marijn Haverbeke and others
11234// Distributed under an MIT license: http://codemirror.net/LICENSE
11235
11236(function(mod) {
11237  if (typeof exports == "object" && typeof module == "object") // CommonJS
11238    mod(require("../../lib/codemirror"), require("../markdown/markdown"), require("../../addon/mode/overlay"));
11239  else if (typeof define == "function" && define.amd) // AMD
11240    define(["../../lib/codemirror", "../markdown/markdown", "../../addon/mode/overlay"], mod);
11241  else // Plain browser env
11242    mod(CodeMirror);
11243})(function(CodeMirror) {
11244"use strict";
11245
11246var urlRE = /^((?:(?:aaas?|about|acap|adiumxtra|af[ps]|aim|apt|attachment|aw|beshare|bitcoin|bolo|callto|cap|chrome(?:-extension)?|cid|coap|com-eventbrite-attendee|content|crid|cvs|data|dav|dict|dlna-(?:playcontainer|playsingle)|dns|doi|dtn|dvb|ed2k|facet