https://www.bayhealth.org/Assets/libs/vue/vue.js

1/*!
2 * Vue.js v2.6.11
3 * (c) 2014-2019 Evan You
4 * Released under the MIT License.
5 */
6(function (global, factory) {
7  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
8  typeof define === 'function' && define.amd ? define(factory) :
9  (global = global || self, global.Vue = factory());
10}(this, function () { 'use strict';
11
12  /*  */
13
14  var emptyObject = Object.freeze({});
15
16  // These helpers produce better VM code in JS engines due to their
17  // explicitness and function inlining.
18  function isUndef (v) {
19    return v === undefined || v === null
20  }
21
22  function isDef (v) {
23    return v !== undefined && v !== null
24  }
25
26  function isTrue (v) {
27    return v === true
28  }
29
30  function isFalse (v) {
31    return v === false
32  }
33
34  /**
35   * Check if value is primitive.
36   */
37  function isPrimitive (value) {
38    return (
39      typeof value === 'string' ||
40      typeof value === 'number' ||
41      // $flow-disable-line
42      typeof value === 'symbol' ||
43      typeof value === 'boolean'
44    )
45  }
46
47  /**
48   * Quick object check - this is primarily used to tell
49   * Objects from primitive values when we know the value
50   * is a JSON-compliant type.
51   */
52  function isObject (obj) {
53    return obj !== null && typeof obj === 'object'
54  }
55
56  /**
57   * Get the raw type string of a value, e.g., [object Object].
58   */
59  var _toString = Object.prototype.toString;
60
61  function toRawType (value) {
62    return _toString.call(value).slice(8, -1)
63  }
64
65  /**
66   * Strict object type check. Only returns true
67   * for plain JavaScript objects.
68   */
69  function isPlainObject (obj) {
70    return _toString.call(obj) === '[object Object]'
71  }
72
73  function isRegExp (v) {
74    return _toString.call(v) === '[object RegExp]'
75  }
76
77  /**
78   * Check if val is a valid array index.
79   */
80  function isValidArrayIndex (val) {
81    var n = parseFloat(String(val));
82    return n >= 0 && Math.floor(n) === n && isFinite(val)
83  }
84
85  function isPromise (val) {
86    return (
87      isDef(val) &&
88      typeof val.then === 'function' &&
89      typeof val.catch === 'function'
90    )
91  }
92
93  /**
94   * Convert a value to a string that is actually rendered.
95   */
96  function toString (val) {
97    return val == null
98      ? ''
99      : Array.isArray(val) || (isPlainObject(val) && val.toString === _toString)
100        ? JSON.stringify(val, null, 2)
101        : String(val)
102  }
103
104  /**
105   * Convert an input value to a number for persistence.
106   * If the conversion fails, return original string.
107   */
108  function toNumber (val) {
109    var n = parseFloat(val);
110    return isNaN(n) ? val : n
111  }
112
113  /**
114   * Make a map and return a function for checking if a key
115   * is in that map.
116   */
117  function makeMap (
118    str,
119    expectsLowerCase
120  ) {
121    var map = Object.create(null);
122    var list = str.split(',');
123    for (var i = 0; i < list.length; i++) {
124      map[list[i]] = true;
125    }
126    return expectsLowerCase
127      ? function (val) { return map[val.toLowerCase()]; }
128      : function (val) { return map[val]; }
129  }
130
131  /**
132   * Check if a tag is a built-in tag.
133   */
134  var isBuiltInTag = makeMap('slot,component', true);
135
136  /**
137   * Check if an attribute is a reserved attribute.
138   */
139  var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');
140
141  /**
142   * Remove an item from an array.
143   */
144  function remove (arr, item) {
145    if (arr.length) {
146      var index = arr.indexOf(item);
147      if (index > -1) {
148        return arr.splice(index, 1)
149      }
150    }
151  }
152
153  /**
154   * Check whether an object has the property.
155   */
156  var hasOwnProperty = Object.prototype.hasOwnProperty;
157  function hasOwn (obj, key) {
158    return hasOwnProperty.call(obj, key)
159  }
160
161  /**
162   * Create a cached version of a pure function.
163   */
164  function cached (fn) {
165    var cache = Object.create(null);
166    return (function cachedFn (str) {
167      var hit = cache[str];
168      return hit || (cache[str] = fn(str))
169    })
170  }
171
172  /**
173   * Camelize a hyphen-delimited string.
174   */
175  var camelizeRE = /-(\w)/g;
176  var camelize = cached(function (str) {
177    return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
178  });
179
180  /**
181   * Capitalize a string.
182   */
183  var capitalize = cached(function (str) {
184    return str.charAt(0).toUpperCase() + str.slice(1)
185  });
186
187  /**
188   * Hyphenate a camelCase string.
189   */
190  var hyphenateRE = /\B([A-Z])/g;
191  var hyphenate = cached(function (str) {
192    return str.replace(hyphenateRE, '-$1').toLowerCase()
193  });
194
195  /**
196   * Simple bind polyfill for environments that do not support it,
197   * e.g., PhantomJS 1.x. Technically, we don't need this anymore
198   * since native bind is now performant enough in most browsers.

199   * But removing it would mean breaking code that was able to run in
200   * PhantomJS 1.x, so this must be kept for backward compatibility.
201   */
202
203  /* istanbul ignore next */
204  function polyfillBind (fn, ctx) {
205    function boundFn (a) {
206      var l = arguments.length;
207      return l
208        ? l > 1
209          ? fn.apply(ctx, arguments)
210          : fn.call(ctx, a)
211        : fn.call(ctx)
212    }
213
214    boundFn._length = fn.length;
215    return boundFn
216  }
217
218  function nativeBind (fn, ctx) {
219    return fn.bind(ctx)
220  }
221
222  var bind = Function.prototype.bind
223    ? nativeBind
224    : polyfillBind;
225
226  /**
227   * Convert an Array-like object to a real Array.
228   */
229  function toArray (list, start) {
230    start = start || 0;
231    var i = list.length - start;
232    var ret = new Array(i);
233    while (i--) {
234      ret[i] = list[i + start];
235    }
236    return ret
237  }
238
239  /**
240   * Mix properties into target object.
241   */
242  function extend (to, _from) {
243    for (var key in _from) {
244      to[key] = _from[key];
245    }
246    return to
247  }
248
249  /**
250   * Merge an Array of Objects into a single Object.
251   */
252  function toObject (arr) {
253    var res = {};
254    for (var i = 0; i < arr.length; i++) {
255      if (arr[i]) {
256        extend(res, arr[i]);
257      }
258    }
259    return res
260  }
261
262  /* eslint-disable no-unused-vars */
263
264  /**
265   * Perform no operation.
266   * Stubbing args to make Flow happy without leaving useless transpiled code
267   * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).
268   */
269  function noop (a, b, c) {}
270
271  /**
272   * Always return false.
273   */
274  var no = function (a, b, c) { return false; };
275
276  /* eslint-enable no-unused-vars */
277
278  /**
279   * Return the same value.
280   */
281  var identity = function (_) { return _; };
282
283  /**
284   * Generate a string containing static keys from compiler modules.
285   */
286  function genStaticKeys (modules) {
287    return modules.reduce(function (keys, m) {
288      return keys.concat(m.staticKeys || [])
289    }, []).join(',')
290  }
291
292  /**
293   * Check if two values are loosely equal - that is,
294   * if they are plain objects, do they have the same shape?
295   */
296  function looseEqual (a, b) {
297    if (a === b) { return true }
298    var isObjectA = isObject(a);
299    var isObjectB = isObject(b);
300    if (isObjectA && isObjectB) {
301      try {
302        var isArrayA = Array.isArray(a);
303        var isArrayB = Array.isArray(b);
304        if (isArrayA && isArrayB) {
305          return a.length === b.length && a.every(function (e, i) {
306            return looseEqual(e, b[i])
307          })
308        } else if (a instanceof Date && b instanceof Date) {
309          return a.getTime() === b.getTime()
310        } else if (!isArrayA && !isArrayB) {
311          var keysA = Object.keys(a);
312          var keysB = Object.keys(b);
313          return keysA.length === keysB.length && keysA.every(function (key) {
314            return looseEqual(a[key], b[key])
315          })
316        } else {
317          /* istanbul ignore next */
318          return false
319        }
320      } catch (e) {
321        /* istanbul ignore next */
322        return false
323      }
324    } else if (!isObjectA && !isObjectB) {
325      return String(a) === String(b)
326    } else {
327      return false
328    }
329  }
330
331  /**
332   * Return the first index at which a loosely equal value can be
333   * found in the array (if value is a plain object, the array must
334   * contain an object of the same shape), or -1 if it is not present.
335   */
336  function looseIndexOf (arr, val) {
337    for (var i = 0; i < arr.length; i++) {
338      if (looseEqual(arr[i], val)) { return i }
339    }
340    return -1
341  }
342
343  /**
344   * Ensure a function is called only once.
345   */
346  function once (fn) {
347    var called = false;
348    return function () {
349      if (!called) {
350        called = true;
351        fn.apply(this, arguments);
352      }
353    }
354  }
355
356  var SSR_ATTR = 'data-server-rendered';
357
358  var ASSET_TYPES = [
359    'component',
360    'directive',
361    'filter'
362  ];
363
364  var LIFECYCLE_HOOKS = [
365    'beforeCreate',
366    'created',
367    'beforeMount',
368    'mounted',
369    'beforeUpdate',
370    'updated',
371    'beforeDestroy',
372    'destroyed',
373    'activated',
374    'deactivated',
375    'errorCaptured',
376    'serverPrefetch'
377  ];
378
379  /*  */
380
381
382
383  var config = ({
384    /**
385     * Option merge strategies (used in core/util/options)
386     */
387    // $flow-disable-line
388    optionMergeStrategies: Object.create(null),
389
390    /**
391     * Whether to suppress warnings.
392     */
393    silent: false,
394
395    /**
396     * Show production mode tip message on boot?
397     */
398    productionTip: "development" !== 'production',
399
400    /**
401     * Whether to enable devtools
402     */
403    devtools: "development" !== 'production',
404
405    /**
406     * Whether to record perf
407     */
408    performance: false,
409
410    /**
411     * Error handler for watcher errors
412     */
413    errorHandler: null,
414
415    /**
416     * Warn handler for watcher warns
417     */
418    warnHandler: null,
419
420    /**
421     * Ignore certain custom elements
422     */
423    ignoredElements: [],
424
425    /**
426     * Custom user key aliases for v-on
427     */
428    // $flow-disable-line
429    keyCodes: Object.create(null),
430
431    /**
432     * Check if a tag is reserved so that it cannot be registered as a

433     * component. This is platform-dependent and may be overwritten.
434     */
435    isReservedTag: no,
436
437    /**
438     * Check if an attribute is reserved so that it cannot be used as a component
439     * prop. This is platform-dependent and may be overwritten.
440     */
441    isReservedAttr: no,
442
443    /**
444     * Check if a tag is an unknown element.
445     * Platform-dependent.
446     */
447    isUnknownElement: no,
448
449    /**
450     * Get the namespace of an element
451     */
452    getTagNamespace: noop,
453
454    /**
455     * Parse the real tag name for the specific platform.
456     */
457    parsePlatformTagName: identity,
458
459    /**
460     * Check if an attribute must be bound using property, e.g. value
461     * Platform-dependent.
462     */
463    mustUseProp: no,
464
465    /**
466     * Perform updates asynchronously. Intended to be used by Vue Test Utils
467     * This will significantly reduce performance if set to false.
468     */
469    async: true,
470
471    /**
472     * Exposed for legacy reasons
473     */
474    _lifecycleHooks: LIFECYCLE_HOOKS
475  });
476
477  /*  */
478
479  /**
480   * unicode letters used for parsing html tags, component names and property paths.
481   * using https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
482   * skipping \u10000-\uEFFFF due to it freezing up PhantomJS
483   */
484  var unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/;
485
486  /**
487   * Check if a string starts with $ or _
488   */
489  function isReserved (str) {
490    var c = (str + '').charCodeAt(0);
491    return c === 0x24 || c === 0x5F
492  }
493
494  /**
495   * Define a property.
496   */
497  function def (obj, key, val, enumerable) {
498    Object.defineProperty(obj, key, {
499      value: val,
500      enumerable: !!enumerable,
501      writable: true,
502      configurable: true
503    });
504  }
505
506  /**
507   * Parse simple path.
508   */
509  var bailRE = new RegExp(("[^" + (unicodeRegExp.source) + ".$_\\d]"));
510  function parsePath (path) {
511    if (bailRE.test(path)) {
512      return
513    }
514    var segments = path.split('.');
515    return function (obj) {
516      for (var i = 0; i < segments.length; i++) {
517        if (!obj) { return }
518        obj = obj[segments[i]];
519      }
520      return obj
521    }
522  }
523
524  /*  */
525
526  // can we use __proto__?
527  var hasProto = '__proto__' in {};
528
529  // Browser environment sniffing
530  var inBrowser = typeof window !== 'undefined';
531  var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
532  var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
533  var UA = inBrowser && window.navigator.userAgent.toLowerCase();
534  var isIE = UA && /msie|trident/.test(UA);
535  var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
536  var isEdge = UA && UA.indexOf('edge/') > 0;
537  var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
538  var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
539  var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
540  var isPhantomJS = UA && /phantomjs/.test(UA);
541  var isFF = UA && UA.match(/firefox\/(\d+)/);
542
543  // Firefox has a "watch" function on Object.prototype...
544  var nativeWatch = ({}).watch;
545
546  var supportsPassive = false;
547  if (inBrowser) {
548    try {
549      var opts = {};
550      Object.defineProperty(opts, 'passive', ({
551        get: function get () {
552          /* istanbul ignore next */
553          supportsPassive = true;
554        }
555      })); // https://github.com/facebook/flow/issues/285
556      window.addEventListener('test-passive', null, opts);
557    } catch (e) {}
558  }
559
560  // this needs to be lazy-evaled because vue may be required before
561  // vue-server-renderer can set VUE_ENV
562  var _isServer;
563  var isServerRendering = function () {
564    if (_isServer === undefined) {
565      /* istanbul ignore if */
566      if (!inBrowser && !inWeex && typeof global !== 'undefined') {
567        // detect presence of vue-server-renderer and avoid
568        // Webpack shimming the process
569        _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';
570      } else {
571        _isServer = false;
572      }
573    }
574    return _isServer
575  };
576
577  // detect devtools
578  var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
579
580  /* istanbul ignore next */
581  function isNative (Ctor) {
582    return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
583  }
584
585  var hasSymbol =
586    typeof Symbol !== 'undefined' && isNative(Symbol) &&
587    typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);
588
589  var _Set;
590  /* istanbul ignore if */ // $flow-disable-line
591  if (typeof Set !== 'undefined' && isNative(Set)) {
592    // use native Set when available.
593    _Set = Set;
594  } else {
595    // a non-standard Set polyfill that only works with primitive keys.
596    _Set = /*@__PURE__*/(function () {
597      function Set () {
598        this.set = Object.create(null);
599      }
600      Set.prototype.has = function has (key) {
601        return this.set[key] === true
602      };
603      Set.prototype.add = function add (key) {
604        this.set[key] = true;
605      };
606      Set.prototype.clear = function clear () {
607        this.set = Object.create(null);
608      };
609
610      return Set;
611    }());
612  }
613
614  /*  */
615
616  var warn = noop;
617  var tip = noop;
618  var generateComponentTrace = (noop); // work around flow check
619  var formatComponentName = (noop);
620
621  {
622    var hasConsole = typeof console !== 'undefined';
623    var classifyRE = /(?:^|[-_])(\w)/g;
624    var classify = function (str) { return str
625      .replace(classifyRE, function (c) { return c.toUpperCase(); })
626      .replace(/[-_]/g, ''); };
627
628    warn = function (msg, vm) {
629      var trace = vm ? generateComponentTrace(vm) : '';
630
631      if (config.warnHandler) {
632        config.warnHandler.call(null, msg, vm, trace);
633      } else if (hasConsole && (!config.silent)) {
634        console.error(("[Vue warn]: " + msg + trace));
635      }
636    };
637
638    tip = function (msg, vm) {
639      if (hasConsole && (!config.silent)) {
640        console.warn("[Vue tip]: " + msg + (
641          vm ? generateComponentTrace(vm) : ''
642        ));
643      }
644    };
645
646    formatComponentName = function (vm, includeFile) {
647      if (vm.$root === vm) {
648        return '<Root>'
649      }
650      var options = typeof vm === 'function' && vm.cid != null
651        ? vm.options
652        : vm._isVue
653          ? vm.$options || vm.constructor.options
654          : vm;
655      var name = options.name || options._componentTag;
656      var file = options.__file;
657      if (!name && file) {
658        var match = file.match(/([^/\\]+)\.vue$/);
659        name = match && match[1];
660      }
661
662      return (
663        (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
664        (file && includeFile !== false ? (" at " + file) : '')
665      )
666    };
667
668    var repeat = function (str, n) {
669      var res = '';
670      while (n) {
671        if (n % 2 === 1) { res += str; }
672        if (n > 1) { str += str; }
673        n >>= 1;
674      }
675      return res
676    };
677
678    generateComponentTrace = function (vm) {
679      if (vm._isVue && vm.$parent) {
680        var tree = [];
681        var currentRecursiveSequence = 0;
682        while (vm) {
683          if (tree.length > 0) {
684            var last = tree[tree.length - 1];
685            if (last.constructor === vm.constructor) {
686              currentRecursiveSequence++;
687              vm = vm.$parent;
688              continue
689            } else if (currentRecursiveSequence > 0) {
690              tree[tree.length - 1] = [last, currentRecursiveSequence];
691              currentRecursiveSequence = 0;
692            }
693          }
694          tree.push(vm);
695          vm = vm.$parent;
696        }
697        return '\n\nfound in\n\n' + tree
698          .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
699              ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
700              : formatComponentName(vm))); })
701          .join('\n')
702      } else {
703        return ("\n\n(found in " + (formatComponentName(vm)) + ")")
704      }
705    };
706  }
707
708  /*  */
709
710  var uid = 0;
711
712  /**
713   * A dep is an observable that can have multiple
714   * directives subscribing to it.
715   */
716  var Dep = function Dep () {
717    this.id = uid++;
718    this.subs = [];
719  };
720
721  Dep.prototype.addSub = function addSub (sub) {
722    this.subs.push(sub);
723  };
724
725  Dep.prototype.removeSub = function removeSub (sub) {
726    remove(this.subs, sub);
727  };
728

729  Dep.prototype.depend = function depend () {
730    if (Dep.target) {
731      Dep.target.addDep(this);
732    }
733  };
734
735  Dep.prototype.notify = function notify () {
736    // stabilize the subscriber list first
737    var subs = this.subs.slice();
738    if (!config.async) {
739      // subs aren't sorted in scheduler if not running async
740      // we need to sort them now to make sure they fire in correct
741      // order
742      subs.sort(function (a, b) { return a.id - b.id; });
743    }
744    for (var i = 0, l = subs.length; i < l; i++) {
745      subs[i].update();
746    }
747  };
748
749  // The current target watcher being evaluated.
750  // This is globally unique because only one watcher
751  // can be evaluated at a time.
752  Dep.target = null;
753  var targetStack = [];
754
755  function pushTarget (target) {
756    targetStack.push(target);
757    Dep.target = target;
758  }
759
760  function popTarget () {
761    targetStack.pop();
762    Dep.target = targetStack[targetStack.length - 1];
763  }
764
765  /*  */
766
767  var VNode = function VNode (
768    tag,
769    data,
770    children,
771    text,
772    elm,
773    context,
774    componentOptions,
775    asyncFactory
776  ) {
777    this.tag = tag;
778    this.data = data;
779    this.children = children;
780    this.text = text;
781    this.elm = elm;
782    this.ns = undefined;
783    this.context = context;
784    this.fnContext = undefined;
785    this.fnOptions = undefined;
786    this.fnScopeId = undefined;
787    this.key = data && data.key;
788    this.componentOptions = componentOptions;
789    this.componentInstance = undefined;
790    this.parent = undefined;
791    this.raw = false;
792    this.isStatic = false;
793    this.isRootInsert = true;
794    this.isComment = false;
795    this.isCloned = false;
796    this.isOnce = false;
797    this.asyncFactory = asyncFactory;

798    this.asyncMeta = undefined;
799    this.isAsyncPlaceholder = false;
800  };
801
802  var prototypeAccessors = { child: { configurable: true } };
803
804  // DEPRECATED: alias for componentInstance for backwards compat.
805  /* istanbul ignore next */
806  prototypeAccessors.child.get = function () {
807    return this.componentInstance
808  };
809
810  Object.defineProperties( VNode.prototype, prototypeAccessors );
811
812  var createEmptyVNode = function (text) {
813    if ( text === void 0 ) text = '';
814
815    var node = new VNode();
816    node.text = text;
817    node.isComment = true;
818    return node
819  };
820
821  function createTextVNode (val) {
822    return new VNode(undefined, undefined, undefined, String(val))
823  }
824
825  // optimized shallow clone
826  // used for static nodes and slot nodes because they may be reused across
827  // multiple renders, cloning them avoids errors when DOM manipulations rely
828  // on their elm reference.
829  function cloneVNode (vnode) {
830    var cloned = new VNode(
831      vnode.tag,
832      vnode.data,
833      // #7975
834      // clone children array to avoid mutating original in case of cloning
835      // a child.
836      vnode.children && vnode.children.slice(),
837      vnode.text,
838      vnode.elm,
839      vnode.context,
840      vnode.componentOptions,
841      vnode.asyncFactory
842    );
843    cloned.ns = vnode.ns;
844    cloned.isStatic = vnode.isStatic;
845    cloned.key = vnode.key;
846    cloned.isComment = vnode.isComment;
847    cloned.fnContext = vnode.fnContext;
848    cloned.fnOptions = vnode.fnOptions;
849    cloned.fnScopeId = vnode.fnScopeId;
850    cloned.asyncMeta = vnode.asyncMeta;
851    cloned.isCloned = true;
852    return cloned
853  }
854
855  /*
856   * not type checking this file because flow doesn't play well with
857   * dynamically accessing methods on Array prototype
858   */
859
860  var arrayProto = Array.prototype;
861  var arrayMethods = Object.create(arrayProto);
862
863  var methodsToPatch = [
864    'push',
865    'pop',
866    'shift',
867    'unshift',
868    'splice',
869    'sort',
870    'reverse'
871  ];
872
873  /**
874   * Intercept mutating methods and emit events
875   */
876  methodsToPatch.forEach(function (method) {
877    // cache original method
878    var original = arrayProto[method];
879    def(arrayMethods, method, function mutator () {
880      var args = [], len = arguments.length;
881      while ( len-- ) args[ len ] = arguments[ len ];
882
883      var result = original.apply(this, args);
884      var ob = this.__ob__;
885      var inserted;
886      switch (method) {
887        case 'push':
888        case 'unshift':
889          inserted = args;
890          break
891        case 'splice':
892          inserted = args.slice(2);
893          break
894      }
895      if (inserted) { ob.observeArray(inserted); }
896      // notify change
897      ob.dep.notify();
898      return result
899    });
900  });
901
902  /*  */
903
904  var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
905
906  /**
907   * In some cases we may want to disable observation inside a component's
908   * update computation.
909   */
910  var shouldObserve = true;
911
912  function toggleObserving (value) {
913    shouldObserve = value;
914  }
915
916  /**
917   * Observer class that is attached to each observed
918   * object. Once attached, the observer converts the target
919   * object's property keys into getter/setters that
920   * collect dependencies and dispatch updates.
921   */
922  var Observer = function Observer (value) {
923    this.value = value;
924    this.dep = new Dep();
925    this.vmCount = 0;
926    def(value, '__ob__', this);
927    if (Array.isArray(value)) {
928      if (hasProto) {
929        protoAugment(value, arrayMethods);
930      } else {
931        copyAugment(value, arrayMethods, arrayKeys);
932      }
933      this.observeArray(value);
934    } else {
935      this.walk(value);
936    }
937  };
938
939  /**
940   * Walk through all properties and convert them into
941   * getter/setters. This method should only be called when
942   * value type is Object.
943   */
944  Observer.prototype.walk = function walk (obj) {
945    var keys = Object.keys(obj);
946    for (var i = 0; i < keys.length; i++) {
947      defineReactive$$1(obj, keys[i]);
948    }
949  };
950
951  /**
952   * Observe a list of Array items.
953   */
954  Observer.prototype.observeArray = function observeArray (items) {
955    for (var i = 0, l = items.length; i < l; i++) {
956      observe(items[i]);
957    }
958  };
959
960  // helpers
961
962  /**
963   * Augment a target Object or Array by intercepting
964   * the prototype chain using __proto__
965   */

966  function protoAugment (target, src) {
967    /* eslint-disable no-proto */
968    target.__proto__ = src;
969    /* eslint-enable no-proto */
970  }
971
972  /**
973   * Augment a target Object or Array by defining
974   * hidden properties.
975   */
976  /* istanbul ignore next */
977  function copyAugment (target, src, keys) {
978    for (var i = 0, l = keys.length; i < l; i++) {
979      var key = keys[i];
980      def(target, key, src[key]);
981    }
982  }
983
984  /**
985   * Attempt to create an observer instance for a value,
986   * returns the new observer if successfully observed,
987   * or the existing observer if the value already has one.
988   */
989  function observe (value, asRootData) {
990    if (!isObject(value) || value instanceof VNode) {
991      return
992    }
993    var ob;
994    if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
995      ob = value.__ob__;
996    } else if (
997      shouldObserve &&
998      !isServerRendering() &&
999      (Array.isArray(value) || isPlainObject(value)) &&
1000      Object.isExtensible(value) &&
1001      !value._isVue
1002    ) {
1003      ob = new Observer(value);
1004    }
1005    if (asRootData && ob) {
1006      ob.vmCount++;
1007    }
1008    return ob
1009  }
1010
1011  /**
1012   * Define a reactive property on an Object.
1013   */
1014  function defineReactive$$1 (
1015    obj,
1016    key,
1017    val,
1018    customSetter,
1019    shallow
1020  ) {
1021    var dep = new Dep();
1022
1023    var property = Object.getOwnPropertyDescriptor(obj, key);
1024    if (property && property.configurable === false) {
1025      return
1026    }
1027
1028    // cater for pre-defined getter/setters
1029    var getter = property && property.get;
1030    var setter = property && property.set;
1031    if ((!getter || setter) && arguments.length === 2) {
1032      val = obj[key];
1033    }
1034
1035    var childOb = !shallow && observe(val);
1036    Object.defineProperty(obj, key, {
1037      enumerable: true,
1038      configurable: true,
1039      get: function reactiveGetter () {
1040        var value = getter ? getter.call(obj) : val;
1041        if (Dep.target) {
1042          dep.depend();
1043          if (childOb) {
1044            childOb.dep.depend();
1045            if (Array.isArray(value)) {
1046              dependArray(value);
1047            }
1048          }
1049        }
1050        return value
1051      },
1052      set: function reactiveSetter (newVal) {
1053        var value = getter ? getter.call(obj) : val;
1054        /* eslint-disable no-self-compare */
1055        if (newVal === value || (newVal !== newVal && value !== value)) {
1056          return
1057        }
1058        /* eslint-enable no-self-compare */
1059        if (customSetter) {
1060          customSetter();
1061        }
1062        // #7981: for accessor properties without setter
1063        if (getter && !setter) { return }
1064        if (setter) {
1065          setter.call(obj, newVal);
1066        } else {
1067          val = newVal;
1068        }
1069        childOb = !shallow && observe(newVal);
1070        dep.notify();
1071      }
1072    });
1073  }
1074
1075  /**
1076   * Set a property on an object. Adds the new property and
1077   * triggers change notification if the property doesn't
1078   * already exist.
1079   */
1080  function set (target, key, val) {
1081    if (isUndef(target) || isPrimitive(target)
1082    ) {
1083      warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
1084    }
1085    if (Array.isArray(target) && isValidArrayIndex(key)) {
1086      target.length = Math.max(target.length, key);
1087      target.splice(key, 1, val);
1088      return val
1089    }
1090    if (key in target && !(key in Object.prototype)) {
1091      target[key] = val;
1092      return val
1093    }
1094    var ob = (target).__ob__;
1095    if (target._isVue || (ob && ob.vmCount)) {
1096      warn(
1097        'Avoid adding reactive properties to a Vue instance or its root $data ' +
1098        'at runtime - declare it upfront in the data option.'
1099      );
1100      return val
1101    }
1102    if (!ob) {
1103      target[key] = val;
1104      return val
1105    }
1106    defineReactive$$1(ob.value, key, val);
1107    ob.dep.notify();
1108    return val
1109  }
1110
1111  /**
1112   * Delete a property and trigger change if necessary.
1113   */
1114  function del (target, key) {
1115    if (isUndef(target) || isPrimitive(target)
1116    ) {
1117      warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
1118    }
1119    if (Array.isArray(target) && isValidArrayIndex(key)) {
1120      target.splice(key, 1);
1121      return
1122    }
1123    var ob = (target).__ob__;
1124    if (target._isVue || (ob && ob.vmCount)) {
1125      warn(
1126        'Avoid deleting properties on a Vue instance or its root $data ' +

1127        '- just set it to null.'
1128      );
1129      return
1130    }
1131    if (!hasOwn(target, key)) {
1132      return
1133    }
1134    delete target[key];
1135    if (!ob) {
1136      return
1137    }
1138    ob.dep.notify();
1139  }
1140
1141  /**
1142   * Collect dependencies on array elements when the array is touched, since
1143   * we cannot intercept array element access like property getters.
1144   */
1145  function dependArray (value) {
1146    for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
1147      e = value[i];
1148      e && e.__ob__ && e.__ob__.dep.depend();
1149      if (Array.isArray(e)) {
1150        dependArray(e);
1151      }
1152    }
1153  }
1154
1155  /*  */
1156
1157  /**
1158   * Option overwriting strategies are functions that handle
1159   * how to merge a parent option value and a child option
1160   * value into the final value.
1161   */
1162  var strats = config.optionMergeStrategies;
1163
1164  /**
1165   * Options with restrictions
1166   */
1167  {
1168    strats.el = strats.propsData = function (parent, child, vm, key) {
1169      if (!vm) {
1170        warn(
1171          "option \"" + key + "\" can only be used during instance " +
1172          'creation with the `new` keyword.'
1173        );
1174      }
1175      return defaultStrat(parent, child)
1176    };
1177  }
1178
1179  /**
1180   * Helper that recursively merges two data objects together.
1181   */
1182  function mergeData (to, from) {
1183    if (!from) { return to }
1184    var key, toVal, fromVal;
1185
1186    var keys = hasSymbol
1187      ? Reflect.ownKeys(from)
1188      : Object.keys(from);
1189
1190    for (var i = 0; i < keys.length; i++) {
1191      key = keys[i];
1192      // in case the object is already observed...
1193      if (key === '__ob__') { continue }
1194      toVal = to[key];
1195      fromVal = from[key];
1196      if (!hasOwn(to, key)) {
1197        set(to, key, fromVal);
1198      } else if (
1199        toVal !== fromVal &&
1200        isPlainObject(toVal) &&
1201        isPlainObject(fromVal)
1202      ) {
1203        mergeData(toVal, fromVal);
1204      }
1205    }
1206    return to
1207  }
1208
1209  /**
1210   * Data
1211   */
1212  function mergeDataOrFn (
1213    parentVal,
1214    childVal,
1215    vm
1216  ) {
1217    if (!vm) {
1218      // in a Vue.extend merge, both should be functions
1219      if (!childVal) {
1220        return parentVal
1221      }
1222      if (!parentVal) {
1223        return childVal
1224      }
1225      // when parentVal & childVal are both present,
1226      // we need to return a function that returns the
1227      // merged result of both functions... no need to
1228      // check if parentVal is a function here because
1229      // it has to be a function to pass previous merges.
1230      return function mergedDataFn () {
1231        return mergeData(
1232          typeof childVal === 'function' ? childVal.call(this, this) : childVal,
1233          typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal
1234        )
1235      }
1236    } else {
1237      return function mergedInstanceDataFn () {
1238        // instance merge
1239        var instanceData = typeof childVal === 'function'
1240          ? childVal.call(vm, vm)
1241          : childVal;
1242        var defaultData = typeof parentVal === 'function'
1243          ? parentVal.call(vm, vm)
1244          : parentVal;
1245        if (instanceData) {
1246          return mergeData(instanceData, defaultData)
1247        } else {
1248          return defaultData
1249        }
1250      }
1251    }
1252  }
1253
1254  strats.data = function (
1255    parentVal,
1256    childVal,
1257    vm
1258  ) {
1259    if (!vm) {
1260      if (childVal && typeof childVal !== 'function') {
1261        warn(
1262          'The "data" option should be a function ' +
1263          'that returns a per-instance value in component ' +
1264          'definitions.',
1265          vm
1266        );
1267
1268        return parentVal
1269      }
1270      return mergeDataOrFn(parentVal, childVal)
1271    }
1272
1273    return mergeDataOrFn(parentVal, childVal, vm)
1274  };
1275
1276  /**
1277   * Hooks and props are merged as arrays.
1278   */
1279  function mergeHook (
1280    parentVal,
1281    childVal
1282  ) {
1283    var res = childVal
1284      ? parentVal
1285        ? parentVal.concat(childVal)
1286        : Array.isArray(childVal)
1287          ? childVal
1288          : [childVal]
1289      : parentVal;
1290    return res
1291      ? dedupeHooks(res)
1292      : res
1293  }
1294
1295  function dedupeHooks (hooks) {
1296    var res = [];
1297    for (var i = 0; i < hooks.length; i++) {
1298      if (res.indexOf(hooks[i]) === -1) {
1299        res.push(hooks[i]);
1300      }
1301    }
1302    return res
1303  }
1304
1305  LIFECYCLE_HOOKS.forEach(function (hook) {
1306    strats[hook] = mergeHook;
1307  });
1308
1309  /**
1310   * Assets
1311   *
1312   * When a vm is present (instance creation), we need to do
1313   * a three-way merge between constructor options, instance
1314   * options and parent options.
1315   */
1316  function mergeAssets (
1317    parentVal,
1318    childVal,
1319    vm,
1320    key
1321  ) {
1322    var res = Object.create(parentVal || null);
1323    if (childVal) {
1324      assertObjectType(key, childVal, vm);
1325      return extend(res, childVal)
1326    } else {
1327      return res
1328    }
1329  }
1330
1331  ASSET_TYPES.forEach(function (type) {
1332    strats[type + 's'] = mergeAssets;
1333  });
1334
1335  /**
1336   * Watchers.
1337   *
1338   * Watchers hashes should not overwrite one
1339   * another, so we merge them as arrays.
1340   */
1341  strats.watch = function (
1342    parentVal,
1343    childVal,
1344    vm,
1345    key
1346  ) {
1347    // work around Firefox's Object.prototype.watch...
1348    if (parentVal === nativeWatch) { parentVal = undefined; }
1349    if (childVal === nativeWatch) { childVal = undefined; }
1350    /* istanbul ignore if */
1351    if (!childVal) { return Object.create(parentVal || null) }
1352    {
1353      assertObjectType(key, childVal, vm);
1354    }
1355    if (!parentVal) { return childVal }
1356    var ret = {};
1357    extend(ret, parentVal);
1358    for (var key$1 in childVal) {
1359      var parent = ret[key$1];
1360      var child = childVal[key$1];
1361      if (parent && !Array.isArray(parent)) {
1362        parent = [parent];
1363      }
1364      ret[key$1] = parent
1365        ? parent.concat(child)
1366        : Array.isArray(child) ? child : [child];
1367    }
1368    return ret
1369  };
1370
1371  /**
1372   * Other object hashes.
1373   */
1374  strats.props =
1375  strats.methods =
1376  strats.inject =
1377  strats.computed = function (
1378    parentVal,
1379    childVal,
1380    vm,
1381    key
1382  ) {
1383    if (childVal && "development" !== 'production') {
1384      assertObjectType(key, childVal, vm);
1385    }
1386    if (!parentVal) { return childVal }
1387    var ret = Object.create(null);
1388    extend(ret, parentVal);
1389    if (childVal) { extend(ret, childVal); }
1390    return ret
1391  };
1392  strats.provide = mergeDataOrFn;
1393
1394  /**
1395   * Default strategy.
1396   */
1397  var defaultStrat = function (parentVal, childVal) {
1398    return childVal === undefined
1399      ? parentVal
1400      : childVal
1401  };
1402
1403  /**
1404   * Validate component names
1405   */
1406  function checkComponents (options) {
1407    for (var key in options.components) {
1408      validateComponentName(key);
1409    }
1410  }
1411
1412  function validateComponentName (name) {
1413    if (!new RegExp(("^[a-zA-Z][\\-\\.0-9_" + (unicodeRegExp.source) + "]*$")).test(name)) {
1414      warn(

1415        'Invalid component name: "' + name + '". Component names ' +
1416        'should conform to valid custom element name in html5 specification.'
1417      );
1418    }
1419    if (isBuiltInTag(name) || config.isReservedTag(name)) {
1420      warn(
1421        'Do not use built-in or reserved HTML elements as component ' +
1422        'id: ' + name
1423      );
1424    }
1425  }
1426
1427  /**
1428   * Ensure all props option syntax are normalized into the
1429   * Object-based format.
1430   */
1431  function normalizeProps (options, vm) {
1432    var props = options.props;
1433    if (!props) { return }
1434    var res = {};
1435    var i, val, name;
1436    if (Array.isArray(props)) {
1437      i = props.length;
1438      while (i--) {
1439        val = props[i];
1440        if (typeof val === 'string') {
1441          name = camelize(val);
1442          res[name] = { type: null };
1443        } else {
1444          warn('props must be strings when using array syntax.');
1445        }
1446      }
1447    } else if (isPlainObject(props)) {
1448      for (var key in props) {
1449        val = props[key];
1450        name = camelize(key);
1451        res[name] = isPlainObject(val)
1452          ? val
1453          : { type: val };
1454      }
1455    } else {
1456      warn(
1457        "Invalid value for option \"props\": expected an Array or an Object, " +
1458        "but got " + (toRawType(props)) + ".",
1459        vm
1460      );
1461    }
1462    options.props = res;
1463  }
1464
1465  /**
1466   * Normalize all injections into Object-based format
1467   */
1468  function normalizeInject (options, vm) {
1469    var inject = options.inject;
1470    if (!inject) { return }
1471    var normalized = options.inject = {};
1472    if (Array.isArray(inject)) {
1473      for (var i = 0; i < inject.length; i++) {
1474        normalized[inject[i]] = { from: inject[i] };
1475      }
1476    } else if (isPlainObject(inject)) {
1477      for (var key in inject) {
1478        var val = inject[key];
1479        normalized[key] = isPlainObject(val)
1480          ? extend({ from: key }, val)
1481          : { from: val };
1482      }
1483    } else {
1484      warn(
1485        "Invalid value for option \"inject\": expected an Array or an Object, " +
1486        "but got " + (toRawType(inject)) + ".",
1487        vm
1488      );
1489    }
1490  }
1491
1492  /**
1493   * Normalize raw function directives into object format.
1494   */
1495  function normalizeDirectives (options) {
1496    var dirs = options.directives;
1497    if (dirs) {
1498      for (var key in dirs) {
1499        var def$$1 = dirs[key];
1500        if (typeof def$$1 === 'function') {
1501          dirs[key] = { bind: def$$1, update: def$$1 };
1502        }
1503      }
1504    }
1505  }
1506
1507  function assertObjectType (name, value, vm) {
1508    if (!isPlainObject(value)) {
1509      warn(
1510        "Invalid value for option \"" + name + "\": expected an Object, " +
1511        "but got " + (toRawType(value)) + ".",
1512        vm
1513      );
1514    }
1515  }
1516
1517  /**
1518   * Merge two option objects into a new one.
1519   * Core utility used in both instantiation and inheritance.
1520   */
1521  function mergeOptions (
1522    parent,
1523    child,
1524    vm
1525  ) {
1526    {
1527      checkComponents(child);
1528    }
1529
1530    if (typeof child === 'function') {
1531      child = child.options;
1532    }
1533
1534    normalizeProps(child, vm);
1535    normalizeInject(child, vm);
1536    normalizeDirectives(child);
1537
1538    // Apply extends and mixins on the child options,
1539    // but only if it is a raw options object that isn't
1540    // the result of another mergeOptions call.
1541    // Only merged options has the _base property.
1542    if (!child._base) {
1543      if (child.extends) {
1544        parent = mergeOptions(parent, child.extends, vm);
1545      }
1546      if (child.mixins) {
1547        for (var i = 0, l = child.mixins.length; i < l; i++) {
1548          parent = mergeOptions(parent, child.mixins[i], vm);
1549        }
1550      }
1551    }
1552
1553    var options = {};
1554    var key;
1555    for (key in parent) {
1556      mergeField(key);
1557    }
1558    for (key in child) {
1559      if (!hasOwn(parent, key)) {
1560        mergeField(key);
1561      }
1562    }
1563    function mergeField (key) {
1564      var strat = strats[key] || defaultStrat;
1565      options[key] = strat(parent[key], child[key], vm, key);
1566    }
1567    return options
1568  }
1569
1570  /**
1571   * Resolve an asset.
1572   * This function is used because child instances need access
1573   * to assets defined in its ancestor chain.
1574   */
1575  function resolveAsset (
1576    options,
1577    type,
1578    id,
1579    warnMissing
1580  ) {
1581    /* istanbul ignore if */
1582    if (typeof id !== 'string') {
1583      return
1584    }
1585    var assets = options[type];
1586    // check local registration variations first
1587    if (hasOwn(assets, id)) { return assets[id] }
1588    var camelizedId = camelize(id);
1589    if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
1590    var PascalCaseId = capitalize(camelizedId);
1591    if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
1592    // fallback to prototype chain
1593    var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
1594    if (warnMissing && !res) {
1595      warn(
1596        'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
1597        options
1598      );
1599    }
1600    return res
1601  }
1602
1603  /*  */
1604
1605
1606
1607  function validateProp (
1608    key,
1609    propOptions,
1610    propsData,
1611    vm
1612  ) {
1613    var prop = propOptions[key];
1614    var absent = !hasOwn(propsData, key);
1615    var value = propsData[key];
1616    // boolean casting
1617    var booleanIndex = getTypeIndex(Boolean, prop.type);
1618    if (booleanIndex > -1) {
1619      if (absent && !hasOwn(prop, 'default')) {
1620        value = false;
1621      } else if (value === '' || value === hyphenate(key)) {
1622        // only cast empty string / same name to boolean if
1623        // boolean has higher priority
1624        var stringIndex = getTypeIndex(String, prop.type);
1625        if (stringIndex < 0 || booleanIndex < stringIndex) {
1626          value = true;
1627        }
1628      }
1629    }
1630    // check default value
1631    if (value === undefined) {
1632      value = getPropDefaultValue(vm, prop, key);
1633      // since the default value is a fresh copy,
1634      // make sure to observe it.
1635      var prevShouldObserve = shouldObserve;
1636      toggleObserving(true);
1637      observe(value);
1638      toggleObserving(prevShouldObserve);
1639    }
1640    {
1641      assertProp(prop, key, value, vm, absent);
1642    }
1643    return value
1644  }
1645
1646  /**
1647   * Get the default value of a prop.
1648   */
1649  function getPropDefaultValue (vm, prop, key) {
1650    // no default, return undefined
1651    if (!hasOwn(prop, 'default')) {
1652      return undefined
1653    }
1654    var def = prop.default;
1655    // warn against non-factory defaults for Object & Array
1656    if (isObject(def)) {
1657      warn(
1658        'Invalid default value for prop "' + key + '": ' +
1659        'Props with type Object/Array must use a factory function ' +
1660        'to return the default value.',
1661        vm
1662      );
1663    }
1664    // the raw prop value was also undefined from previous render,

1665    // return previous default value to avoid unnecessary watcher trigger
1666    if (vm && vm.$options.propsData &&
1667      vm.$options.propsData[key] === undefined &&
1668      vm._props[key] !== undefined
1669    ) {
1670      return vm._props[key]
1671    }
1672    // call factory function for non-Function types
1673    // a value is Function if its prototype is function even across different execution context
1674    return typeof def === 'function' && getType(prop.type) !== 'Function'
1675      ? def.call(vm)
1676      : def
1677  }
1678
1679  /**
1680   * Assert whether a prop is valid.
1681   */
1682  function assertProp (
1683    prop,
1684    name,
1685    value,
1686    vm,
1687    absent
1688  ) {
1689    if (prop.required && absent) {
1690      warn(
1691        'Missing required prop: "' + name + '"',
1692        vm
1693      );
1694      return
1695    }
1696    if (value == null && !prop.required) {
1697      return
1698    }
1699    var type = prop.type;
1700    var valid = !type || type === true;
1701    var expectedTypes = [];
1702    if (type) {
1703      if (!Array.isArray(type)) {
1704        type = [type];
1705      }
1706      for (var i = 0; i < type.length && !valid; i++) {
1707        var assertedType = assertType(value, type[i]);
1708        expectedTypes.push(assertedType.expectedType || '');
1709        valid = assertedType.valid;
1710      }
1711    }
1712
1713    if (!valid) {
1714      warn(
1715        getInvalidTypeMessage(name, value, expectedTypes),
1716        vm
1717      );
1718      return
1719    }
1720    var validator = prop.validator;
1721    if (validator) {
1722      if (!validator(value)) {
1723        warn(
1724          'Invalid prop: custom validator check failed for prop "' + name + '".',
1725          vm
1726        );
1727      }
1728    }
1729  }
1730
1731  var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;
1732
1733  function assertType (value, type) {
1734    var valid;
1735    var expectedType = getType(type);
1736    if (simpleCheckRE.test(expectedType)) {
1737      var t = typeof value;
1738      valid = t === expectedType.toLowerCase();
1739      // for primitive wrapper objects
1740      if (!valid && t === 'object') {
1741        valid = value instanceof type;
1742      }
1743    } else if (expectedType === 'Object') {
1744      valid = isPlainObject(value);
1745    } else if (expectedType === 'Array') {
1746      valid = Array.isArray(value);
1747    } else {
1748      valid = value instanceof type;
1749    }
1750    return {
1751      valid: valid,
1752      expectedType: expectedType
1753    }
1754  }
1755
1756  /**
1757   * Use function string name to check built-in types,
1758   * because a simple equality check will fail when running
1759   * across different vms / iframes.
1760   */
1761  function getType (fn) {
1762    var match = fn && fn.toString().match(/^\s*function (\w+)/);
1763    return match ? match[1] : ''
1764  }
1765
1766  function isSameType (a, b) {
1767    return getType(a) === getType(b)
1768  }
1769
1770  function getTypeIndex (type, expectedTypes) {
1771    if (!Array.isArray(expectedTypes)) {
1772      return isSameType(expectedTypes, type) ? 0 : -1
1773    }
1774    for (var i = 0, len = expectedTypes.length; i < len; i++) {
1775      if (isSameType(expectedTypes[i], type)) {
1776        return i
1777      }
1778    }
1779    return -1
1780  }
1781
1782  function getInvalidTypeMessage (name, value, expectedTypes) {
1783    var message = "Invalid prop: type check failed for prop \"" + name + "\"." +
1784      " Expected " + (expectedTypes.map(capitalize).join(', '));
1785    var expectedType = expectedTypes[0];
1786    var receivedType = toRawType(value);
1787    var expectedValue = styleValue(value, expectedType);
1788    var receivedValue = styleValue(value, receivedType);
1789    // check if we need to specify expected value
1790    if (expectedTypes.length === 1 &&
1791        isExplicable(expectedType) &&
1792        !isBoolean(expectedType, receivedType)) {
1793      message += " with value " + expectedValue;
1794    }
1795    message += ", got " + receivedType + " ";
1796    // check if we need to specify received value
1797    if (isExplicable(receivedType)) {
1798      message += "with value " + receivedValue + ".";
1799    }
1800    return message
1801  }
1802
1803  function styleValue (value, type) {
1804    if (type === 'String') {
1805      return ("\"" + value + "\"")
1806    } else if (type === 'Number') {
1807      return ("" + (Number(value)))
1808    } else {
1809      return ("" + value)
1810    }
1811  }
1812
1813  function isExplicable (value) {
1814    var explicitTypes = ['string', 'number', 'boolean'];
1815    return explicitTypes.some(function (elem) { return value.toLowerCase() === elem; })
1816  }
1817
1818  function isBoolean () {
1819    var args = [], len = arguments.length;
1820    while ( len-- ) args[ len ] = arguments[ len ];
1821
1822    return args.some(function (elem) { return elem.toLowerCase() === 'boolean'; })
1823  }
1824
1825  /*  */
1826
1827  function handleError (err, vm, info) {
1828    // Deactivate deps tracking while processing error handler to avoid possible infinite rendering.
1829    // See: https://github.com/vuejs/vuex/issues/1505
1830    pushTarget();
1831    try {
1832      if (vm) {
1833        var cur = vm;
1834        while ((cur = cur.$parent)) {
1835          var hooks = cur.$options.errorCaptured;
1836          if (hooks) {
1837            for (var i = 0; i < hooks.length; i++) {
1838              try {
1839                var capture = hooks[i].call(cur, err, vm, info) === false;
1840                if (capture) { return }
1841              } catch (e) {
1842                globalHandleError(e, cur, 'errorCaptured hook');
1843              }
1844            }
1845          }
1846        }
1847      }
1848      globalHandleError(err, vm, info);
1849    } finally {
1850      popTarget();
1851    }
1852  }
1853
1854  function invokeWithErrorHandling (
1855    handler,
1856    context,
1857    args,
1858    vm,
1859    info
1860  ) {
1861    var res;
1862    try {

1863      res = args ? handler.apply(context, args) : handler.call(context);
1864      if (res && !res._isVue && isPromise(res) && !res._handled) {
1865        res.catch(function (e) { return handleError(e, vm, info + " (Promise/async)"); });
1866        // issue #9511
1867        // avoid catch triggering multiple times when nested calls
1868        res._handled = true;
1869      }
1870    } catch (e) {
1871      handleError(e, vm, info);
1872    }
1873    return res
1874  }
1875
1876  function globalHandleError (err, vm, info) {
1877    if (config.errorHandler) {
1878      try {
1879        return config.errorHandler.call(null, err, vm, info)
1880      } catch (e) {
1881        // if the user intentionally throws the original error in the handler,
1882        // do not log it twice
1883        if (e !== err) {
1884          logError(e, null, 'config.errorHandler');
1885        }
1886      }
1887    }
1888    logError(err, vm, info);
1889  }
1890
1891  function logError (err, vm, info) {
1892    {
1893      warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
1894    }
1895    /* istanbul ignore else */
1896    if ((inBrowser || inWeex) && typeof console !== 'undefined') {
1897      console.error(err);
1898    } else {
1899      throw err
1900    }
1901  }
1902
1903  /*  */
1904
1905  var isUsingMicroTask = false;
1906
1907  var callbacks = [];
1908  var pending = false;
1909
1910  function flushCallbacks () {
1911    pending = false;
1912    var copies = callbacks.slice(0);
1913    callbacks.length = 0;
1914    for (var i = 0; i < copies.length; i++) {
1915      copies[i]();
1916    }
1917  }
1918
1919  // Here we have async deferring wrappers using microtasks.
1920  // In 2.5 we used (macro) tasks (in combination with microtasks).
1921  // However, it has subtle problems when state is changed right before repaint
1922  // (e.g. #6813, out-in transitions).
1923  // Also, using (macro) tasks in event handler would cause some weird behaviors
1924  // that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
1925  // So we now use microtasks everywhere, again.
1926  // A major drawback of this tradeoff is that there are some scenarios
1927  // where microtasks have too high a priority and fire in between supposedly
1928  // sequential events (e.g. #4521, #6690, which have workarounds)
1929  // or even between bubbling of the same event (#6566).
1930  var timerFunc;
1931
1932  // The nextTick behavior leverages the microtask queue, which can be accessed
1933  // via either native Promise.then or MutationObserver.
1934  // MutationObserver has wider support, however it is seriously bugged in
1935  // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
1936  // completely stops working after triggering a few times... so, if native
1937  // Promise is available, we will use it:
1938  /* istanbul ignore next, $flow-disable-line */
1939  if (typeof Promise !== 'undefined' && isNative(Promise)) {
1940    var p = Promise.resolve();
1941    timerFunc = function () {
1942      p.then(flushCallbacks);
1943      // In problematic UIWebViews, Promise.then doesn't completely break, but
1944      // it can get stuck in a weird state where callbacks are pushed into the
1945      // microtask queue but the queue isn't being flushed, until the browser
1946      // needs to do some other work, e.g. handle a timer. Therefore we can
1947      // "force" the microtask queue to be flushed by adding an empty timer.
1948      if (isIOS) { setTimeout(noop); }
1949    };
1950    isUsingMicroTask = true;
1951  } else if (!isIE && typeof MutationObserver !== 'undefined' && (
1952    isNative(MutationObserver) ||
1953    // PhantomJS and iOS 7.x
1954    MutationObserver.toString() === '[object MutationObserverConstructor]'
1955  )) {
1956    // Use MutationObserver where native Promise is not available,
1957    // e.g. PhantomJS, iOS7, Android 4.4
1958    // (#6466 MutationObserver is unreliable in IE11)
1959    var counter = 1;
1960    var observer = new MutationObserver(flushCallbacks);
1961    var textNode = document.createTextNode(String(counter));
1962    observer.observe(textNode, {
1963      characterData: true
1964    });
1965    timerFunc = function () {
1966      counter = (counter + 1) % 2;
1967      textNode.data = String(counter);
1968    };
1969    isUsingMicroTask = true;
1970  } else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
1971    // Fallback to setImmediate.
1972    // Technically it leverages the (macro) task queue,
1973    // but it is still a better choice than setTimeout.

1974    timerFunc = function () {
1975      setImmediate(flushCallbacks);
1976    };
1977  } else {
1978    // Fallback to setTimeout.
1979    timerFunc = function () {
1980      setTimeout(flushCallbacks, 0);
1981    };
1982  }
1983
1984  function nextTick (cb, ctx) {
1985    var _resolve;
1986    callbacks.push(function () {
1987      if (cb) {
1988        try {
1989          cb.call(ctx);
1990        } catch (e) {
1991          handleError(e, ctx, 'nextTick');
1992        }
1993      } else if (_resolve) {
1994        _resolve(ctx);
1995      }
1996    });
1997    if (!pending) {
1998      pending = true;
1999      timerFunc();
2000    }
2001    // $flow-disable-line
2002    if (!cb && typeof Promise !== 'undefined') {
2003      return new Promise(function (resolve) {
2004        _resolve = resolve;
2005      })
2006    }
2007  }
2008
2009  /*  */
2010
2011  var mark;
2012  var measure;
2013
2014  {
2015    var perf = inBrowser && window.performance;
2016    /* istanbul ignore if */
2017    if (
2018      perf &&
2019      perf.mark &&
2020      perf.measure &&
2021      perf.clearMarks &&
2022      perf.clearMeasures
2023    ) {
2024      mark = function (tag) { return perf.mark(tag); };
2025      measure = function (name, startTag, endTag) {
2026        perf.measure(name, startTag, endTag);
2027        perf.clearMarks(startTag);
2028        perf.clearMarks(endTag);
2029        // perf.clearMeasures(name)
2030      };
2031    }
2032  }
2033
2034  /* not type checking this file because flow doesn't play well with Proxy */
2035
2036  var initProxy;
2037
2038  {
2039    var allowedGlobals = makeMap(
2040      'Infinity,undefined,NaN,isFinite,isNaN,' +
2041      'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
2042      'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
2043      'require' // for Webpack/Browserify
2044    );
2045
2046    var warnNonPresent = function (target, key) {
2047      warn(
2048        "Property or method \"" + key + "\" is not defined on the instance but " +
2049        'referenced during render. Make sure that this property is reactive, ' +
2050        'either in the data option, or for class-based components, by ' +
2051        'initializing the property. ' +
2052        'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
2053        target
2054      );
2055    };
2056
2057    var warnReservedPrefix = function (target, key) {
2058      warn(
2059        "Property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
2060        'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
2061        'prevent conflicts with Vue internals. ' +
2062        'See: https://vuejs.org/v2/api/#data',
2063        target
2064      );
2065    };
2066
2067    var hasProxy =
2068      typeof Proxy !== 'undefined' && isNative(Proxy);
2069
2070    if (hasProxy) {
2071      var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
2072      config.keyCodes = new Proxy(config.keyCodes, {
2073        set: function set (target, key, value) {
2074          if (isBuiltInModifier(key)) {
2075            warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
2076            return false
2077          } else {
2078            target[key] = value;
2079            return true
2080          }
2081        }
2082      });
2083    }
2084
2085    var hasHandler = {
2086      has: function has (target, key) {
2087        var has = key in target;
2088        var isAllowed = allowedGlobals(key) ||
2089          (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));
2090        if (!has && !isAllowed) {
2091          if (key in target.$data) { warnReservedPrefix(target, key); }
2092          else { warnNonPresent(target, key); }
2093        }
2094        return has || !isAllowed
2095      }
2096    };
2097
2098    var getHandler = {
2099      get: function get (target, key) {
2100        if (typeof key === 'string' && !(key in target)) {
2101          if (key in target.$data) { warnReservedPrefix(target, key); }
2102          else { warnNonPresent(target, key); }
2103        }
2104        return target[key]
2105      }
2106    };
2107
2108    initProxy = function initProxy (vm) {
2109      if (hasProxy) {
2110        // determine which proxy handler to use
2111        var options = vm.$options;
2112        var handlers = options.render && options.render._withStripped
2113          ? getHandler
2114          : hasHandler;
2115        vm._renderProxy = new Proxy(vm, handlers);
2116      } else {
2117        vm._renderProxy = vm;
2118      }
2119    };
2120  }
2121
2122  /*  */
2123
2124  var seenObjects = new _Set();
2125
2126  /**
2127   * Recursively traverse an object to evoke all converted
2128   * getters, so that every nested property inside the object
2129   * is collected as a "deep" dependency.
2130   */
2131  function traverse (val) {
2132    _traverse(val, seenObjects);
2133    seenObjects.clear();
2134  }
2135
2136  function _traverse (val, seen) {
2137    var i, keys;
2138    var isA = Array.isArray(val);
2139    if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
2140      return
2141    }
2142    if (val.__ob__) {
2143      var depId = val.__ob__.dep.id;
2144      if (seen.has(depId)) {
2145        return
2146      }
2147      seen.add(depId);
2148    }
2149    if (isA) {
2150      i = val.length;
2151      while (i--) { _traverse(val[i], seen); }
2152    } else {
2153      keys = Object.keys(val);
2154      i = keys.length;
2155      while (i--) { _traverse(val[keys[i]], seen); }
2156    }
2157  }
2158
2159  /*  */
2160
2161  var normalizeEvent = cached(function (name) {
2162    var passive = name.charAt(0) === '&';
2163    name = passive ? name.slice(1) : name;
2164    var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
2165    name = once$$1 ? name.slice(1) : name;
2166    var capture = name.charAt(0) === '!';
2167    name = capture ? name.slice(1) : name;
2168    return {
2169      name: name,
2170      once: once$$1,
2171      capture: capture,
2172      passive: passive
2173    }
2174  });
2175
2176  function createFnInvoker (fns, vm) {
2177    function invoker () {
2178      var arguments$1 = arguments;
2179
2180      var fns = invoker.fns;
2181      if (Array.isArray(fns)) {
2182        var cloned = fns.slice();
2183        for (var i = 0; i < cloned.length; i++) {
2184          invokeWithErrorHandling(cloned[i], null, arguments$1, vm, "v-on handler");
2185        }
2186      } else {
2187        // return handler return value for single handlers
2188        return invokeWithErrorHandling(fns, null, arguments, vm, "v-on handler")
2189      }
2190    }
2191    invoker.fns = fns;
2192    return invoker
2193  }
2194
2195  function updateListeners (
2196    on,
2197    oldOn,
2198    add,
2199    remove$$1,
2200    createOnceHandler,
2201    vm
2202  ) {
2203    var name, def$$1, cur, old, event;
2204    for (name in on) {
2205      def$$1 = cur = on[name];
2206      old = oldOn[name];
2207      event = normalizeEvent(name);
2208      if (isUndef(cur)) {
2209        warn(
2210          "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
2211          vm
2212        );
2213      } else if (isUndef(old)) {
2214        if (isUndef(cur.fns)) {
2215          cur = on[name] = createFnInvoker(cur, vm);
2216        }
2217        if (isTrue(event.once)) {
2218          cur = on[name] = createOnceHandler(event.name, cur, event.capture);
2219        }
2220        add(event.name, cur, event.capture, event.passive, event.params);
2221      } else if (cur !== old) {
2222        old.fns = cur;
2223        on[name] = old;
2224      }
2225    }
2226    for (name in oldOn) {
2227      if (isUndef(on[name])) {
2228        event = normalizeEvent(name);
2229        remove$$1(event.name, oldOn[name], event.capture);
2230      }
2231    }
2232  }
2233
2234  /*  */
2235
2236  function mergeVNodeHook (def, hookKey, hook) {
2237    if (def instanceof VNode) {
2238      def = def.data.hook || (def.data.hook = {});
2239    }
2240    var invoker;
2241    var oldHook = def[hookKey];
2242
2243    function wrappedHook () {
2244      hook.apply(this, arguments);
2245      // important: remove merged hook to ensure it's called only once
2246      // and prevent memory leak
2247      remove(invoker.fns, wrappedHook);
2248    }
2249
2250    if (isUndef(oldHook)) {
2251      // no existing hook
2252      invoker = createFnInvoker([wrappedHook]);
2253    } else {
2254      /* istanbul ignore if */
2255      if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
2256        // already a merged invoker
2257        invoker = oldHook;
2258        invoker.fns.push(wrappedHook);
2259      } else {
2260        // existing plain hook
2261        invoker = createFnInvoker([oldHook, wrappedHook]);
2262      }
2263    }
2264
2265    invoker.merged = true;
2266    def[hookKey] = invoker;
2267  }
2268
2269  /*  */
2270
2271  function extractPropsFromVNodeData (
2272    data,
2273    Ctor,
2274    tag
2275  ) {
2276    // we are only extracting raw values here.
2277    // validation and default values are handled in the child
2278    // component itself.
2279    var propOptions = Ctor.options.props;
2280    if (isUndef(propOptions)) {
2281      return
2282    }
2283    var res = {};
2284    var attrs = data.attrs;
2285    var props = data.props;
2286    if (isDef(attrs) || isDef(props)) {
2287      for (var key in propOptions) {
2288        var altKey = hyphenate(key);
2289        {
2290          var keyInLowerCase = key.toLowerCase();
2291          if (
2292            key !== keyInLowerCase &&
2293            attrs && hasOwn(attrs, keyInLowerCase)
2294          ) {
2295            tip(
2296              "Prop \"" + keyInLowerCase + "\" is passed to component " +
2297              (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
2298              " \"" + key + "\". " +
2299              "Note that HTML attributes are case-insensitive and camelCased " +
2300              "props need to use their kebab-case equivalents when using in-DOM " +
2301              "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
2302            );
2303          }
2304        }
2305        checkProp(res, props, key, altKey, true) ||
2306        checkProp(res, attrs, key, altKey, false);
2307      }
2308    }
2309    return res
2310  }
2311
2312  function checkProp (
2313    res,
2314    hash,
2315    key,
2316    altKey,
2317    preserve
2318  ) {

2319    if (isDef(hash)) {
2320      if (hasOwn(hash, key)) {
2321        res[key] = hash[key];
2322        if (!preserve) {
2323          delete hash[key];
2324        }
2325        return true
2326      } else if (hasOwn(hash, altKey)) {
2327        res[key] = hash[altKey];
2328        if (!preserve) {
2329          delete hash[altKey];
2330        }
2331        return true
2332      }
2333    }
2334    return false
2335  }
2336
2337  /*  */
2338
2339  // The template compiler attempts to minimize the need for normalization by
2340  // statically analyzing the template at compile time.
2341  //
2342  // For plain HTML markup, normalization can be completely skipped because the
2343  // generated render function is guaranteed to return Array<VNode>. There are
2344  // two cases where extra normalization is needed:
2345
2346  // 1. When the children contains components - because a functional component
2347  // may return an Array instead of a single root. In this case, just a simple
2348  // normalization is needed - if any child is an Array, we flatten the whole
2349  // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
2350  // because functional components already normalize their own children.
2351  function simpleNormalizeChildren (children) {
2352    for (var i = 0; i < children.length; i++) {
2353      if (Array.isArray(children[i])) {
2354        return Array.prototype.concat.apply([], children)
2355      }
2356    }
2357    return children
2358  }
2359
2360  // 2. When the children contains constructs that always generated nested Arrays,
2361  // e.g. <template>, <slot>, v-for, or when the children is provided by user
2362  // with hand-written render functions / JSX. In such cases a full normalization
2363  // is needed to cater to all possible types of children values.
2364  function normalizeChildren (children) {
2365    return isPrimitive(children)
2366      ? [createTextVNode(children)]
2367      : Array.isArray(children)
2368        ? normalizeArrayChildren(children)
2369        : undefined
2370  }
2371
2372  function isTextNode (node) {
2373    return isDef(node) && isDef(node.text) && isFalse(node.isComment)
2374  }
2375
2376  function normalizeArrayChildren (children, nestedIndex) {
2377    var res = [];
2378    var i, c, lastIndex, last;
2379    for (i = 0; i < children.length; i++) {
2380      c = children[i];
2381      if (isUndef(c) || typeof c === 'boolean') { continue }
2382      lastIndex = res.length - 1;
2383      last = res[lastIndex];
2384      //  nested
2385      if (Array.isArray(c)) {
2386        if (c.length > 0) {
2387          c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
2388          // merge adjacent text nodes
2389          if (isTextNode(c[0]) && isTextNode(last)) {
2390            res[lastIndex] = createTextVNode(last.text + (c[0]).text);
2391            c.shift();
2392          }
2393          res.push.apply(res, c);
2394        }
2395      } else if (isPrimitive(c)) {
2396        if (isTextNode(last)) {
2397          // merge adjacent text nodes
2398          // this is necessary for SSR hydration because text nodes are
2399          // essentially merged when rendered to HTML strings
2400          res[lastIndex] = createTextVNode(last.text + c);
2401        } else if (c !== '') {
2402          // convert primitive to vnode
2403          res.push(createTextVNode(c));
2404        }
2405      } else {
2406        if (isTextNode(c) && isTextNode(last)) {
2407          // merge adjacent text nodes
2408          res[lastIndex] = createTextVNode(last.text + c.text);
2409        } else {
2410          // default key for nested array children (likely generated by v-for)
2411          if (isTrue(children._isVList) &&
2412            isDef(c.tag) &&
2413            isUndef(c.key) &&
2414            isDef(nestedIndex)) {
2415            c.key = "__vlist" + nestedIndex + "_" + i + "__";
2416          }
2417          res.push(c);
2418        }
2419      }
2420    }
2421    return res
2422  }
2423
2424  /*  */
2425
2426  function initProvide (vm) {
2427    var provide = vm.$options.provide;
2428    if (provide) {
2429      vm._provided = typeof provide === 'function'
2430        ? provide.call(vm)
2431        : provide;
2432    }
2433  }
2434
2435  function initInjections (vm) {
2436    var result = resolveInject(vm.$options.inject, vm);
2437    if (result) {
2438      toggleObserving(false);
2439      Object.keys(result).forEach(function (key) {
2440        /* istanbul ignore else */
2441        {
2442          defineReactive$$1(vm, key, result[key], function () {
2443            warn(
2444              "Avoid mutating an injected value directly since the changes will be " +
2445              "overwritten whenever the provided component re-renders. " +
2446              "injection being mutated: \"" + key + "\"",
2447              vm
2448            );
2449          });
2450        }
2451      });
2452      toggleObserving(true);
2453    }
2454  }
2455
2456  function resolveInject (inject, vm) {
2457    if (inject) {
2458      // inject is :any because flow is not smart enough to figure out cached
2459      var result = Object.create(null);
2460      var keys = hasSymbol
2461        ? Reflect.ownKeys(inject)
2462        : Object.keys(inject);
2463
2464      for (var i = 0; i < keys.length; i++) {
2465        var key = keys[i];
2466        // #6574 in case the inject object is observed...
2467        if (key === '__ob__') { continue }
2468        var provideKey = inject[key].from;
2469        var source = vm;
2470        while (source) {
2471          if (source._provided && hasOwn(source._provided, provideKey)) {
2472            result[key] = source._provided[provideKey];
2473            break
2474          }
2475          source = source.$parent;
2476        }
2477        if (!source) {
2478          if ('default' in inject[key]) {
2479            var provideDefault = inject[key].default;
2480            result[key] = typeof provideDefault === 'function'
2481              ? provideDefault.call(vm)
2482              : provideDefault;
2483          } else {
2484            warn(("Injection \"" + key + "\" not found"), vm);
2485          }
2486        }
2487      }
2488      return result
2489    }
2490  }
2491
2492  /*  */
2493
2494
2495
2496  /**
2497   * Runtime helper for resolving raw children VNodes into a slot object.
2498   */
2499  function resolveSlots (
2500    children,
2501    context
2502  ) {
2503    if (!children || !children.length) {
2504      return {}
2505    }
2506    var slots = {};
2507    for (var i = 0, l = children.length; i < l; i++) {
2508      var child = children[i];
2509      var data = child.data;
2510      // remove slot attribute if the node is resolved as a Vue slot node
2511      if (data && data.attrs && data.attrs.slot) {
2512        delete data.attrs.slot;
2513      }
2514      // named slots should only be respected if the vnode was rendered in the
2515      // same context.
2516      if ((child.context === context || child.fnContext === context) &&
2517        data && data.slot != null
2518      ) {
2519        var name = data.slot;
2520        var slot = (slots[name] || (slots[name] = []));
2521        if (child.tag === 'template') {
2522          slot.push.apply(slot, child.children || []);
2523        } else {
2524          slot.push(child);
2525        }
2526      } else {
2527        (slots.default || (slots.default = [])).push(child);
2528      }
2529    }
2530    // ignore slots that contains only whitespace
2531    for (var name$1 in slots) {
2532      if (slots[name$1].every(isWhitespace)) {
2533        delete slots[name$1];

2534      }
2535    }
2536    return slots
2537  }
2538
2539  function isWhitespace (node) {
2540    return (node.isComment && !node.asyncFactory) || node.text === ' '
2541  }
2542
2543  /*  */
2544
2545  function normalizeScopedSlots (
2546    slots,
2547    normalSlots,
2548    prevSlots
2549  ) {
2550    var res;
2551    var hasNormalSlots = Object.keys(normalSlots).length > 0;
2552    var isStable = slots ? !!slots.$stable : !hasNormalSlots;
2553    var key = slots && slots.$key;
2554    if (!slots) {
2555      res = {};
2556    } else if (slots._normalized) {
2557      // fast path 1: child component re-render only, parent did not change
2558      return slots._normalized
2559    } else if (
2560      isStable &&
2561      prevSlots &&
2562      prevSlots !== emptyObject &&
2563      key === prevSlots.$key &&
2564      !hasNormalSlots &&
2565      !prevSlots.$hasNormal
2566    ) {
2567      // fast path 2: stable scoped slots w/ no normal slots to proxy,
2568      // only need to normalize once
2569      return prevSlots
2570    } else {
2571      res = {};
2572      for (var key$1 in slots) {
2573        if (slots[key$1] && key$1[0] !== '$') {
2574          res[key$1] = normalizeScopedSlot(normalSlots, key$1, slots[key$1]);
2575        }
2576      }
2577    }
2578    // expose normal slots on scopedSlots
2579    for (var key$2 in normalSlots) {
2580      if (!(key$2 in res)) {
2581        res[key$2] = proxyNormalSlot(normalSlots, key$2);
2582      }
2583    }
2584    // avoriaz seems to mock a non-extensible $scopedSlots object
2585    // and when that is passed down this would cause an error
2586    if (slots && Object.isExtensible(slots)) {
2587      (slots)._normalized = res;
2588    }
2589    def(res, '$stable', isStable);
2590    def(res, '$key', key);
2591    def(res, '$hasNormal', hasNormalSlots);
2592    return res
2593  }
2594
2595  function normalizeScopedSlot(normalSlots, key, fn) {
2596    var normalized = function () {
2597      var res = arguments.length ? fn.apply(null, arguments) : fn({});
2598      res = res && typeof res === 'object' && !Array.isArray(res)
2599        ? [res] // single vnode
2600        : normalizeChildren(res);
2601      return res && (
2602        res.length === 0 ||
2603        (res.length === 1 && res[0].isComment) // #9658
2604      ) ? undefined
2605        : res
2606    };
2607    // this is a slot using the new v-slot syntax without scope. although it is
2608    // compiled as a scoped slot, render fn users would expect it to be present
2609    // on this.$slots because the usage is semantically a normal slot.
2610    if (fn.proxy) {
2611      Object.defineProperty(normalSlots, key, {
2612        get: normalized,
2613        enumerable: true,
2614        configurable: true
2615      });
2616    }
2617    return normalized
2618  }
2619
2620  function proxyNormalSlot(slots, key) {
2621    return function () { return slots[key]; }
2622  }
2623
2624  /*  */
2625
2626  /**
2627   * Runtime helper for rendering v-for lists.
2628   */
2629  function renderList (
2630    val,
2631    render
2632  ) {
2633    var ret, i, l, keys, key;
2634    if (Array.isArray(val) || typeof val === 'string') {
2635      ret = new Array(val.length);
2636      for (i = 0, l = val.length; i < l; i++) {
2637        ret[i] = render(val[i], i);
2638      }
2639    } else if (typeof val === 'number') {
2640      ret = new Array(val);
2641      for (i = 0; i < val; i++) {
2642        ret[i] = render(i + 1, i);
2643      }
2644    } else if (isObject(val)) {
2645      if (hasSymbol && val[Symbol.iterator]) {
2646        ret = [];
2647        var iterator = val[Symbol.iterator]();
2648        var result = iterator.next();
2649        while (!result.done) {
2650          ret.push(render(result.value, ret.length));
2651          result = iterator.next();
2652        }
2653      } else {
2654        keys = Object.keys(val);
2655        ret = new Array(keys.length);
2656        for (i = 0, l = keys.length; i < l; i++) {
2657          key = keys[i];
2658          ret[i] = render(val[key], key, i);
2659        }
2660      }
2661    }
2662    if (!isDef(ret)) {
2663      ret = [];
2664    }
2665    (ret)._isVList = true;
2666    return ret
2667  }
2668
2669  /*  */
2670
2671  /**
2672   * Runtime helper for rendering <slot>
2673   */

2674  function renderSlot (
2675    name,
2676    fallback,
2677    props,
2678    bindObject
2679  ) {
2680    var scopedSlotFn = this.$scopedSlots[name];
2681    var nodes;
2682    if (scopedSlotFn) { // scoped slot
2683      props = props || {};
2684      if (bindObject) {
2685        if (!isObject(bindObject)) {
2686          warn(
2687            'slot v-bind without argument expects an Object',
2688            this
2689          );
2690        }
2691        props = extend(extend({}, bindObject), props);
2692      }
2693      nodes = scopedSlotFn(props) || fallback;
2694    } else {
2695      nodes = this.$slots[name] || fallback;
2696    }
2697
2698    var target = props && props.slot;
2699    if (target) {
2700      return this.$createElement('template', { slot: target }, nodes)
2701    } else {
2702      return nodes
2703    }
2704  }
2705
2706  /*  */
2707
2708  /**
2709   * Runtime helper for resolving filters
2710   */
2711  function resolveFilter (id) {
2712    return resolveAsset(this.$options, 'filters', id, true) || identity
2713  }
2714
2715  /*  */
2716
2717  function isKeyNotMatch (expect, actual) {
2718    if (Array.isArray(expect)) {
2719      return expect.indexOf(actual) === -1
2720    } else {
2721      return expect !== actual
2722    }
2723  }
2724
2725  /**
2726   * Runtime helper for checking keyCodes from config.
2727   * exposed as Vue.prototype._k
2728   * passing in eventKeyName as last argument separately for backwards compat
2729   */
2730  function checkKeyCodes (
2731    eventKeyCode,
2732    key,
2733    builtInKeyCode,
2734    eventKeyName,
2735    builtInKeyName
2736  ) {
2737    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
2738    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
2739      return isKeyNotMatch(builtInKeyName, eventKeyName)
2740    } else if (mappedKeyCode) {
2741      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
2742    } else if (eventKeyName) {
2743      return hyphenate(eventKeyName) !== key
2744    }
2745  }
2746
2747  /*  */
2748
2749  /**
2750   * Runtime helper for merging v-bind="object" into a VNode's data.
2751   */
2752  function bindObjectProps (
2753    data,
2754    tag,
2755    value,
2756    asProp,
2757    isSync
2758  ) {
2759    if (value) {
2760      if (!isObject(value)) {
2761        warn(
2762          'v-bind without argument expects an Object or Array value',
2763          this
2764        );
2765      } else {
2766        if (Array.isArray(value)) {
2767          value = toObject(value);
2768        }
2769        var hash;
2770        var loop = function ( key ) {
2771          if (
2772            key === 'class' ||
2773            key === 'style' ||
2774            isReservedAttribute(key)
2775          ) {
2776            hash = data;
2777          } else {
2778            var type = data.attrs && data.attrs.type;
2779            hash = asProp || config.mustUseProp(tag, type, key)
2780              ? data.domProps || (data.domProps = {})
2781              : data.attrs || (data.attrs = {});
2782          }
2783          var camelizedKey = camelize(key);
2784          var hyphenatedKey = hyphenate(key);
2785          if (!(camelizedKey in hash) && !(hyphenatedKey in hash)) {
2786            hash[key] = value[key];
2787
2788            if (isSync) {
2789              var on = data.on || (data.on = {});
2790              on[("update:" + key)] = function ($event) {
2791                value[key] = $event;
2792              };
2793            }
2794          }
2795        };
2796
2797        for (var key in value) loop( key );
2798      }
2799    }
2800    return data
2801  }
2802
2803  /*  */
2804
2805  /**
2806   * Runtime helper for rendering static trees.
2807   */

2808  function renderStatic (
2809    index,
2810    isInFor
2811  ) {
2812    var cached = this._staticTrees || (this._staticTrees = []);
2813    var tree = cached[index];
2814    // if has already-rendered static tree and not inside v-for,
2815    // we can reuse the same tree.
2816    if (tree && !isInFor) {
2817      return tree
2818    }
2819    // otherwise, render a fresh tree.
2820    tree = cached[index] = this.$options.staticRenderFns[index].call(
2821      this._renderProxy,
2822      null,
2823      this // for render fns generated for functional component templates
2824    );
2825    markStatic(tree, ("__static__" + index), false);
2826    return tree
2827  }
2828
2829  /**
2830   * Runtime helper for v-once.
2831   * Effectively it means marking the node as static with a unique key.
2832   */
2833  function markOnce (
2834    tree,
2835    index,
2836    key
2837  ) {
2838    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
2839    return tree
2840  }
2841
2842  function markStatic (
2843    tree,
2844    key,
2845    isOnce
2846  ) {
2847    if (Array.isArray(tree)) {
2848      for (var i = 0; i < tree.length; i++) {
2849        if (tree[i] && typeof tree[i] !== 'string') {
2850          markStaticNode(tree[i], (key + "_" + i), isOnce);
2851        }
2852      }
2853    } else {
2854      markStaticNode(tree, key, isOnce);
2855    }
2856  }
2857
2858  function markStaticNode (node, key, isOnce) {
2859    node.isStatic = true;
2860    node.key = key;
2861    node.isOnce = isOnce;
2862  }
2863
2864  /*  */
2865
2866  function bindObjectListeners (data, value) {
2867    if (value) {
2868      if (!isPlainObject(value)) {
2869        warn(
2870          'v-on without argument expects an Object value',
2871          this
2872        );
2873      } else {
2874        var on = data.on = data.on ? extend({}, data.on) : {};
2875        for (var key in value) {
2876          var existing = on[key];
2877          var ours = value[key];
2878          on[key] = existing ? [].concat(existing, ours) : ours;
2879        }
2880      }
2881    }
2882    return data
2883  }
2884
2885  /*  */
2886
2887  function resolveScopedSlots (
2888    fns, // see flow/vnode
2889    res,
2890    // the following are added in 2.6
2891    hasDynamicKeys,
2892    contentHashKey
2893  ) {
2894    res = res || { $stable: !hasDynamicKeys };
2895    for (var i = 0; i < fns.length; i++) {
2896      var slot = fns[i];
2897      if (Array.isArray(slot)) {
2898        resolveScopedSlots(slot, res, hasDynamicKeys);
2899      } else if (slot) {
2900        // marker for reverse proxying v-slot without scope on this.$slots
2901        if (slot.proxy) {
2902          slot.fn.proxy = true;
2903        }
2904        res[slot.key] = slot.fn;
2905      }
2906    }
2907    if (contentHashKey) {
2908      (res).$key = contentHashKey;
2909    }
2910    return res
2911  }
2912
2913  /*  */
2914
2915  function bindDynamicKeys (baseObj, values) {
2916    for (var i = 0; i < values.length; i += 2) {
2917      var key = values[i];
2918      if (typeof key === 'string' && key) {
2919        baseObj[values[i]] = values[i + 1];
2920      } else if (key !== '' && key !== null) {
2921        // null is a special value for explicitly removing a binding
2922        warn(
2923          ("Invalid value for dynamic directive argument (expected string or null): " + key),
2924          this
2925        );
2926      }
2927    }
2928    return baseObj
2929  }
2930
2931  // helper to dynamically append modifier runtime markers to event names.
2932  // ensure only append when value is already string, otherwise it will be cast
2933  // to string and cause the type check to miss.
2934  function prependModifier (value, symbol) {
2935    return typeof value === 'string' ? symbol + value : value
2936  }
2937
2938  /*  */
2939
2940  function installRenderHelpers (target) {
2941    target._o = markOnce;
2942    target._n = toNumber;
2943    target._s = toString;
2944    target._l = renderList;
2945    target._t = renderSlot;
2946    target._q = looseEqual;
2947    target._i = looseIndexOf;
2948    target._m = renderStatic;
2949    target._f = resolveFilter;
2950    target._k = checkKeyCodes;
2951    target._b = bindObjectProps;
2952    target._v = createTextVNode;
2953    target._e = createEmptyVNode;
2954    target._u = resolveScopedSlots;
2955    target._g = bindObjectListeners;
2956    target._d = bindDynamicKeys;
2957    target._p = prependModifier;
2958  }
2959
2960  /*  */
2961
2962  function FunctionalRenderContext (
2963    data,
2964    props,
2965    children,
2966    parent,
2967    Ctor
2968  ) {
2969    var this$1 = this;
2970
2971    var options = Ctor.options;
2972    // ensure the createElement function in functional components
2973    // gets a unique context - this is necessary for correct named slot check
2974    var contextVm;
2975    if (hasOwn(parent, '_uid')) {
2976      contextVm = Object.create(parent);
2977      // $flow-disable-line
2978      contextVm._original = parent;
2979    } else {
2980      // the context vm passed in is a functional context as well.
2981      // in this case we want to make sure we are able to get a hold to the
2982      // real context instance.
2983      contextVm = parent;
2984      // $flow-disable-line
2985      parent = parent._original;
2986    }
2987    var isCompiled = isTrue(options._compiled);
2988    var needNormalization = !isCompiled;
2989
2990    this.data = data;
2991    this.props = props;
2992    this.children = children;
2993    this.parent = parent;
2994    this.listeners = data.on || emptyObject;
2995    this.injections = resolveInject(options.inject, parent);
2996    this.slots = function () {
2997      if (!this$1.$slots) {
2998        normalizeScopedSlots(
2999          data.scopedSlots,
3000          this$1.$slots = resolveSlots(children, parent)
3001        );
3002      }
3003      return this$1.$slots
3004    };
3005

3006    Object.defineProperty(this, 'scopedSlots', ({
3007      enumerable: true,
3008      get: function get () {
3009        return normalizeScopedSlots(data.scopedSlots, this.slots())
3010      }
3011    }));
3012
3013    // support for compiled functional template
3014    if (isCompiled) {
3015      // exposing $options for renderStatic()
3016      this.$options = options;
3017      // pre-resolve slots for renderSlot()
3018      this.$slots = this.slots();
3019      this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
3020    }
3021
3022    if (options._scopeId) {
3023      this._c = function (a, b, c, d) {
3024        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
3025        if (vnode && !Array.isArray(vnode)) {
3026          vnode.fnScopeId = options._scopeId;
3027          vnode.fnContext = parent;
3028        }
3029        return vnode
3030      };
3031    } else {
3032      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
3033    }
3034  }
3035
3036  installRenderHelpers(FunctionalRenderContext.prototype);
3037
3038  function createFunctionalComponent (
3039    Ctor,
3040    propsData,
3041    data,
3042    contextVm,
3043    children
3044  ) {
3045    var options = Ctor.options;
3046    var props = {};
3047    var propOptions = options.props;
3048    if (isDef(propOptions)) {
3049      for (var key in propOptions) {
3050        props[key] = validateProp(key, propOptions, propsData || emptyObject);
3051      }
3052    } else {
3053      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
3054      if (isDef(data.props)) { mergeProps(props, data.props); }
3055    }
3056
3057    var renderContext = new FunctionalRenderContext(
3058      data,
3059      props,
3060      children,
3061      contextVm,
3062      Ctor
3063    );
3064
3065    var vnode = options.render.call(null, renderContext._c, renderContext);
3066
3067    if (vnode instanceof VNode) {
3068      return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
3069    } else if (Array.isArray(vnode)) {
3070      var vnodes = normalizeChildren(vnode) || [];
3071      var res = new Array(vnodes.length);
3072      for (var i = 0; i < vnodes.length; i++) {
3073        res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
3074      }
3075      return res
3076    }
3077  }
3078
3079  function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
3080    // #7817 clone node before setting fnContext, otherwise if the node is reused
3081    // (e.g. it was from a cached normal slot) the fnContext causes named slots
3082    // that should not be matched to match.
3083    var clone = cloneVNode(vnode);
3084    clone.fnContext = contextVm;
3085    clone.fnOptions = options;
3086    {
3087      (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
3088    }
3089    if (data.slot) {
3090      (clone.data || (clone.data = {})).slot = data.slot;
3091    }
3092    return clone
3093  }
3094
3095  function mergeProps (to, from) {
3096    for (var key in from) {
3097      to[camelize(key)] = from[key];
3098    }
3099  }
3100
3101  /*  */
3102
3103  /*  */
3104
3105  /*  */
3106
3107  /*  */
3108
3109  // inline hooks to be invoked on component VNodes during patch

3110  var componentVNodeHooks = {
3111    init: function init (vnode, hydrating) {
3112      if (
3113        vnode.componentInstance &&
3114        !vnode.componentInstance._isDestroyed &&
3115        vnode.data.keepAlive
3116      ) {
3117        // kept-alive components, treat as a patch
3118        var mountedNode = vnode; // work around flow
3119        componentVNodeHooks.prepatch(mountedNode, mountedNode);
3120      } else {
3121        var child = vnode.componentInstance = createComponentInstanceForVnode(
3122          vnode,
3123          activeInstance
3124        );
3125        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
3126      }
3127    },
3128
3129    prepatch: function prepatch (oldVnode, vnode) {
3130      var options = vnode.componentOptions;
3131      var child = vnode.componentInstance = oldVnode.componentInstance;
3132      updateChildComponent(
3133        child,
3134        options.propsData, // updated props
3135        options.listeners, // updated listeners
3136        vnode, // new parent vnode
3137        options.children // new children
3138      );
3139    },
3140
3141    insert: function insert (vnode) {
3142      var context = vnode.context;
3143      var componentInstance = vnode.componentInstance;
3144      if (!componentInstance._isMounted) {
3145        componentInstance._isMounted = true;
3146        callHook(componentInstance, 'mounted');
3147      }
3148      if (vnode.data.keepAlive) {
3149        if (context._isMounted) {
3150          // vue-router#1212
3151          // During updates, a kept-alive component's child components may
3152          // change, so directly walking the tree here may call activated hooks
3153          // on incorrect children. Instead we push them into a queue which will
3154          // be processed after the whole patch process ended.
3155          queueActivatedComponent(componentInstance);
3156        } else {
3157          activateChildComponent(componentInstance, true /* direct */);
3158        }
3159      }
3160    },
3161
3162    destroy: function destroy (vnode) {
3163      var componentInstance = vnode.componentInstance;
3164      if (!componentInstance._isDestroyed) {
3165        if (!vnode.data.keepAlive) {
3166          componentInstance.$destroy();
3167        } else {
3168          deactivateChildComponent(componentInstance, true /* direct */);
3169        }
3170      }
3171    }
3172  };
3173
3174  var hooksToMerge = Object.keys(componentVNodeHooks);
3175
3176  function createComponent (
3177    Ctor,
3178    data,
3179    context,
3180    children,
3181    tag
3182  ) {
3183    if (isUndef(Ctor)) {
3184      return
3185    }
3186
3187    var baseCtor = context.$options._base;
3188
3189    // plain options object: turn it into a constructor
3190    if (isObject(Ctor)) {
3191      Ctor = baseCtor.extend(Ctor);
3192    }
3193
3194    // if at this stage it's not a constructor or an async component factory,
3195    // reject.
3196    if (typeof Ctor !== 'function') {
3197      {
3198        warn(("Invalid Component definition: " + (String(Ctor))), context);
3199      }
3200      return
3201    }
3202
3203    // async component
3204    var asyncFactory;

3205    if (isUndef(Ctor.cid)) {
3206      asyncFactory = Ctor;
3207      Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
3208      if (Ctor === undefined) {
3209        // return a placeholder node for async component, which is rendered
3210        // as a comment node but preserves all the raw information for the node.
3211        // the information will be used for async server-rendering and hydration.
3212        return createAsyncPlaceholder(
3213          asyncFactory,
3214          data,
3215          context,
3216          children,
3217          tag
3218        )
3219      }
3220    }
3221
3222    data = data || {};
3223
3224    // resolve constructor options in case global mixins are applied after
3225    // component constructor creation
3226    resolveConstructorOptions(Ctor);
3227
3228    // transform component v-model data into props & events
3229    if (isDef(data.model)) {
3230      transformModel(Ctor.options, data);
3231    }
3232
3233    // extract props
3234    var propsData = extractPropsFromVNodeData(data, Ctor, tag);
3235
3236    // functional component
3237    if (isTrue(Ctor.options.functional)) {
3238      return createFunctionalComponent(Ctor, propsData, data, context, children)
3239    }
3240
3241    // extract listeners, since these needs to be treated as
3242    // child component listeners instead of DOM listeners
3243    var listeners = data.on;
3244    // replace with listeners with .native modifier
3245    // so it gets processed during parent component patch.
3246    data.on = data.nativeOn;
3247
3248    if (isTrue(Ctor.options.abstract)) {
3249      // abstract components do not keep anything
3250      // other than props & listeners & slot
3251
3252      // work around flow
3253      var slot = data.slot;
3254      data = {};
3255      if (slot) {
3256        data.slot = slot;
3257      }
3258    }
3259
3260    // install component management hooks onto the placeholder node
3261    installComponentHooks(data);
3262
3263    // return a placeholder vnode
3264    var name = Ctor.options.name || tag;
3265    var vnode = new VNode(
3266      ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
3267      data, undefined, undefined, undefined, context,
3268      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
3269      asyncFactory
3270    );
3271
3272    return vnode
3273  }
3274
3275  function createComponentInstanceForVnode (
3276    vnode, // we know it's MountedComponentVNode but flow doesn't
3277    parent // activeInstance in lifecycle state
3278  ) {
3279    var options = {
3280      _isComponent: true,
3281      _parentVnode: vnode,
3282      parent: parent
3283    };
3284    // check inline-template render functions
3285    var inlineTemplate = vnode.data.inlineTemplate;
3286    if (isDef(inlineTemplate)) {
3287      options.render = inlineTemplate.render;
3288      options.staticRenderFns = inlineTemplate.staticRenderFns;
3289    }
3290    return new vnode.componentOptions.Ctor(options)
3291  }
3292
3293  function installComponentHooks (data) {
3294    var hooks = data.hook || (data.hook = {});
3295    for (var i = 0; i < hooksToMerge.length; i++) {
3296      var key = hooksToMerge[i];
3297      var existing = hooks[key];
3298      var toMerge = componentVNodeHooks[key];
3299      if (existing !== toMerge && !(existing && existing._merged)) {
3300        hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
3301      }
3302    }
3303  }
3304
3305  function mergeHook$1 (f1, f2) {
3306    var merged = function (a, b) {
3307      // flow complains about extra args which is why we use any
3308      f1(a, b);
3309      f2(a, b);
3310    };
3311    merged._merged = true;
3312    return merged
3313  }
3314
3315  // transform component v-model info (value and callback) into
3316  // prop and event handler respectively.
3317  function transformModel (options, data) {
3318    var prop = (options.model && options.model.prop) || 'value';
3319    var event = (options.model && options.model.event) || 'input'
3320    ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
3321    var on = data.on || (data.on = {});
3322    var existing = on[event];
3323    var callback = data.model.callback;
3324    if (isDef(existing)) {
3325      if (
3326        Array.isArray(existing)
3327          ? existing.indexOf(callback) === -1
3328          : existing !== callback
3329      ) {
3330        on[event] = [callback].concat(existing);
3331      }
3332    } else {
3333      on[event] = callback;
3334    }
3335  }
3336
3337  /*  */
3338
3339  var SIMPLE_NORMALIZE = 1;
3340  var ALWAYS_NORMALIZE = 2;
3341
3342  // wrapper function for providing a more flexible interface
3343  // without getting yelled at by flow
3344  function createElement (
3345    context,
3346    tag,
3347    data,
3348    children,
3349    normalizationType,
3350    alwaysNormalize
3351  ) {
3352    if (Array.isArray(data) || isPrimitive(data)) {
3353      normalizationType = children;
3354      children = data;
3355      data = undefined;
3356    }
3357    if (isTrue(alwaysNormalize)) {
3358      normalizationType = ALWAYS_NORMALIZE;
3359    }
3360    return _createElement(context, tag, data, children, normalizationType)
3361  }
3362
3363  function _createElement (
3364    context,
3365    tag,
3366    data,
3367    children,
3368    normalizationType
3369  ) {
3370    if (isDef(data) && isDef((data).__ob__)) {
3371      warn(
3372        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
3373        'Always create fresh vnode data objects in each render!',
3374        context
3375      );
3376      return createEmptyVNode()
3377    }
3378    // object syntax in v-bind
3379    if (isDef(data) && isDef(data.is)) {
3380      tag = data.is;
3381    }
3382    if (!tag) {
3383      // in case of component :is set to falsy value
3384      return createEmptyVNode()
3385    }
3386    // warn against non-primitive key
3387    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
3388    ) {
3389      {
3390        warn(
3391          'Avoid using non-primitive value as key, ' +
3392          'use string/number value instead.',
3393          context
3394        );
3395      }
3396    }
3397    // support single function children as default scoped slot
3398    if (Array.isArray(children) &&
3399      typeof children[0] === 'function'
3400    ) {
3401      data = data || {};
3402      data.scopedSlots = { default: children[0] };
3403      children.length = 0;
3404    }
3405    if (normalizationType === ALWAYS_NORMALIZE) {
3406      children = normalizeChildren(children);
3407    } else if (normalizationType === SIMPLE_NORMALIZE) {
3408      children = simpleNormalizeChildren(children);
3409    }
3410    var vnode, ns;
3411    if (typeof tag === 'string') {
3412      var Ctor;
3413      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
3414      if (config.isReservedTag(tag)) {
3415        // platform built-in elements
3416        if (isDef(data) && isDef(data.nativeOn)) {
3417          warn(

3418            ("The .native modifier for v-on is only valid on components but it was used on <" + tag + ">."),
3419            context
3420          );
3421        }
3422        vnode = new VNode(
3423          config.parsePlatformTagName(tag), data, children,
3424          undefined, undefined, context
3425        );
3426      } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
3427        // component
3428        vnode = createComponent(Ctor, data, context, children, tag);
3429      } else {
3430        // unknown or unlisted namespaced elements
3431        // check at runtime because it may get assigned a namespace when its
3432        // parent normalizes children
3433        vnode = new VNode(
3434          tag, data, children,
3435          undefined, undefined, context
3436        );
3437      }
3438    } else {
3439      // direct component options / constructor
3440      vnode = createComponent(tag, data, context, children);
3441    }
3442    if (Array.isArray(vnode)) {
3443      return vnode
3444    } else if (isDef(vnode)) {
3445      if (isDef(ns)) { applyNS(vnode, ns); }
3446      if (isDef(data)) { registerDeepBindings(data); }
3447      return vnode
3448    } else {
3449      return createEmptyVNode()
3450    }
3451  }
3452
3453  function applyNS (vnode, ns, force) {
3454    vnode.ns = ns;
3455    if (vnode.tag === 'foreignObject') {
3456      // use default namespace inside foreignObject
3457      ns = undefined;
3458      force = true;
3459    }

3460    if (isDef(vnode.children)) {
3461      for (var i = 0, l = vnode.children.length; i < l; i++) {
3462        var child = vnode.children[i];
3463        if (isDef(child.tag) && (
3464          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
3465          applyNS(child, ns, force);
3466        }
3467      }
3468    }
3469  }
3470
3471  // ref #5318
3472  // necessary to ensure parent re-render when deep bindings like :style and
3473  // :class are used on slot nodes
3474  function registerDeepBindings (data) {
3475    if (isObject(data.style)) {
3476      traverse(data.style);
3477    }
3478    if (isObject(data.class)) {
3479      traverse(data.class);
3480    }
3481  }
3482
3483  /*  */
3484
3485  function initRender (vm) {
3486    vm._vnode = null; // the root of the child tree
3487    vm._staticTrees = null; // v-once cached trees
3488    var options = vm.$options;
3489    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
3490    var renderContext = parentVnode && parentVnode.context;
3491    vm.$slots = resolveSlots(options._renderChildren, renderContext);
3492    vm.$scopedSlots = emptyObject;
3493    // bind the createElement fn to this instance
3494    // so that we get proper render context inside it.
3495    // args order: tag, data, children, normalizationType, alwaysNormalize
3496    // internal version is used by render functions compiled from templates
3497    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
3498    // normalization is always applied for the public version, used in
3499    // user-written render functions.
3500    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
3501
3502    // $attrs & $listeners are exposed for easier HOC creation.
3503    // they need to be reactive so that HOCs using them are always updated
3504    var parentData = parentVnode && parentVnode.data;
3505
3506    /* istanbul ignore else */
3507    {
3508      defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
3509        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
3510      }, true);
3511      defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
3512        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
3513      }, true);
3514    }
3515  }
3516
3517  var currentRenderingInstance = null;
3518
3519  function renderMixin (Vue) {
3520    // install runtime convenience helpers
3521    installRenderHelpers(Vue.prototype);
3522
3523    Vue.prototype.$nextTick = function (fn) {
3524      return nextTick(fn, this)
3525    };
3526
3527    Vue.prototype._render = function () {
3528      var vm = this;
3529      var ref = vm.$options;
3530      var render = ref.render;
3531      var _parentVnode = ref._parentVnode;
3532
3533      if (_parentVnode) {
3534        vm.$scopedSlots = normalizeScopedSlots(
3535          _parentVnode.data.scopedSlots,
3536          vm.$slots,
3537          vm.$scopedSlots
3538        );
3539      }
3540
3541      // set parent vnode. this allows render functions to have access
3542      // to the data on the placeholder node.
3543      vm.$vnode = _parentVnode;
3544      // render self
3545      var vnode;
3546      try {
3547        // There's no need to maintain a stack because all render fns are called
3548        // separately from one another. Nested component's render fns are called
3549        // when parent component is patched.
3550        currentRenderingInstance = vm;
3551        vnode = render.call(vm._renderProxy, vm.$createElement);
3552      } catch (e) {
3553        handleError(e, vm, "render");
3554        // return error render result,
3555        // or previous vnode to prevent render error causing blank component
3556        /* istanbul ignore else */
3557        if (vm.$options.renderError) {
3558          try {
3559            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
3560          } catch (e) {
3561            handleError(e, vm, "renderError");
3562            vnode = vm._vnode;
3563          }
3564        } else {
3565          vnode = vm._vnode;
3566        }
3567      } finally {
3568        currentRenderingInstance = null;
3569      }
3570      // if the returned array contains only a single node, allow it
3571      if (Array.isArray(vnode) && vnode.length === 1) {
3572        vnode = vnode[0];
3573      }
3574      // return empty vnode in case the render function errored out
3575      if (!(vnode instanceof VNode)) {
3576        if (Array.isArray(vnode)) {
3577          warn(
3578            'Multiple root nodes returned from render function. Render function ' +
3579            'should return a single root node.',
3580            vm
3581          );
3582        }
3583        vnode = createEmptyVNode();
3584      }
3585      // set parent
3586      vnode.parent = _parentVnode;
3587      return vnode
3588    };
3589  }
3590
3591  /*  */
3592
3593  function ensureCtor (comp, base) {
3594    if (
3595      comp.__esModule ||
3596      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
3597    ) {
3598      comp = comp.default;
3599    }
3600    return isObject(comp)
3601      ? base.extend(comp)
3602      : comp
3603  }
3604
3605  function createAsyncPlaceholder (
3606    factory,
3607    data,
3608    context,
3609    children,
3610    tag
3611  ) {
3612    var node = createEmptyVNode();
3613    node.asyncFactory = factory;
3614    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
3615    return node
3616  }
3617
3618  function resolveAsyncComponent (
3619    factory,
3620    baseCtor
3621  ) {
3622    if (isTrue(factory.error) && isDef(factory.errorComp)) {
3623      return factory.errorComp
3624    }
3625
3626    if (isDef(factory.resolved)) {
3627      return factory.resolved
3628    }
3629
3630    var owner = currentRenderingInstance;

3631    if (owner && isDef(factory.owners) && factory.owners.indexOf(owner) === -1) {
3632      // already pending
3633      factory.owners.push(owner);
3634    }
3635
3636    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
3637      return factory.loadingComp
3638    }
3639
3640    if (owner && !isDef(factory.owners)) {
3641      var owners = factory.owners = [owner];
3642      var sync = true;
3643      var timerLoading = null;
3644      var timerTimeout = null
3645
3646      ;(owner).$on('hook:destroyed', function () { return remove(owners, owner); });
3647
3648      var forceRender = function (renderCompleted) {
3649        for (var i = 0, l = owners.length; i < l; i++) {
3650          (owners[i]).$forceUpdate();
3651        }
3652
3653        if (renderCompleted) {
3654          owners.length = 0;
3655          if (timerLoading !== null) {
3656            clearTimeout(timerLoading);
3657            timerLoading = null;
3658          }
3659          if (timerTimeout !== null) {
3660            clearTimeout(timerTimeout);
3661            timerTimeout = null;
3662          }
3663        }
3664      };
3665
3666      var resolve = once(function (res) {
3667        // cache resolved
3668        factory.resolved = ensureCtor(res, baseCtor);
3669        // invoke callbacks only if this is not a synchronous resolve
3670        // (async resolves are shimmed as synchronous during SSR)
3671        if (!sync) {
3672          forceRender(true);
3673        } else {
3674          owners.length = 0;
3675        }
3676      });
3677
3678      var reject = once(function (reason) {
3679        warn(
3680          "Failed to resolve async component: " + (String(factory)) +
3681          (reason ? ("\nReason: " + reason) : '')
3682        );
3683        if (isDef(factory.errorComp)) {
3684          factory.error = true;
3685          forceRender(true);
3686        }
3687      });
3688
3689      var res = factory(resolve, reject);
3690
3691      if (isObject(res)) {
3692        if (isPromise(res)) {
3693          // () => Promise
3694          if (isUndef(factory.resolved)) {
3695            res.then(resolve, reject);
3696          }
3697        } else if (isPromise(res.component)) {
3698          res.component.then(resolve, reject);
3699
3700          if (isDef(res.error)) {
3701            factory.errorComp = ensureCtor(res.error, baseCtor);
3702          }
3703
3704          if (isDef(res.loading)) {
3705            factory.loadingComp = ensureCtor(res.loading, baseCtor);
3706            if (res.delay === 0) {
3707              factory.loading = true;
3708            } else {
3709              timerLoading = setTimeout(function () {
3710                timerLoading = null;
3711                if (isUndef(factory.resolved) && isUndef(factory.error)) {
3712                  factory.loading = true;
3713                  forceRender(false);
3714                }
3715              }, res.delay || 200);
3716            }
3717          }
3718
3719          if (isDef(res.timeout)) {
3720            timerTimeout = setTimeout(function () {
3721              timerTimeout = null;
3722              if (isUndef(factory.resolved)) {
3723                reject(
3724                  "timeout (" + (res.timeout) + "ms)"
3725                );
3726              }
3727            }, res.timeout);
3728          }
3729        }
3730      }
3731
3732      sync = false;
3733      // return in case resolved synchronously
3734      return factory.loading
3735        ? factory.loadingComp
3736        : factory.resolved
3737    }
3738  }
3739
3740  /*  */
3741
3742  function isAsyncPlaceholder (node) {
3743    return node.isComment && node.asyncFactory
3744  }
3745
3746  /*  */
3747
3748  function getFirstComponentChild (children) {
3749    if (Array.isArray(children)) {
3750      for (var i = 0; i < children.length; i++) {
3751        var c = children[i];
3752        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
3753          return c
3754        }
3755      }
3756    }
3757  }
3758
3759  /*  */
3760
3761  /*  */
3762
3763  function initEvents (vm) {
3764    vm._events = Object.create(null);
3765    vm._hasHookEvent = false;
3766    // init parent attached events
3767    var listeners = vm.$options._parentListeners;
3768    if (listeners) {
3769      updateComponentListeners(vm, listeners);
3770    }
3771  }
3772
3773  var target;
3774
3775  function add (event, fn) {
3776    target.$on(event, fn);
3777  }
3778
3779  function remove$1 (event, fn) {
3780    target.$off(event, fn);
3781  }
3782
3783  function createOnceHandler (event, fn) {
3784    var _target = target;
3785    return function onceHandler () {
3786      var res = fn.apply(null, arguments);
3787      if (res !== null) {
3788        _target.$off(event, onceHandler);
3789      }
3790    }
3791  }
3792
3793  function updateComponentListeners (
3794    vm,
3795    listeners,
3796    oldListeners
3797  ) {
3798    target = vm;
3799    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
3800    target = undefined;
3801  }
3802
3803  function eventsMixin (Vue) {
3804    var hookRE = /^hook:/;

3805    Vue.prototype.$on = function (event, fn) {
3806      var vm = this;
3807      if (Array.isArray(event)) {
3808        for (var i = 0, l = event.length; i < l; i++) {
3809          vm.$on(event[i], fn);
3810        }
3811      } else {
3812        (vm._events[event] || (vm._events[event] = [])).push(fn);
3813        // optimize hook:event cost by using a boolean flag marked at registration
3814        // instead of a hash lookup
3815        if (hookRE.test(event)) {
3816          vm._hasHookEvent = true;
3817        }
3818      }
3819      return vm
3820    };
3821
3822    Vue.prototype.$once = function (event, fn) {
3823      var vm = this;
3824      function on () {
3825        vm.$off(event, on);
3826        fn.apply(vm, arguments);
3827      }
3828      on.fn = fn;
3829      vm.$on(event, on);
3830      return vm
3831    };
3832
3833    Vue.prototype.$off = function (event, fn) {
3834      var vm = this;
3835      // all
3836      if (!arguments.length) {
3837        vm._events = Object.create(null);
3838        return vm
3839      }
3840      // array of events
3841      if (Array.isArray(event)) {
3842        for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
3843          vm.$off(event[i$1], fn);
3844        }
3845        return vm
3846      }
3847      // specific event
3848      var cbs = vm._events[event];
3849      if (!cbs) {
3850        return vm
3851      }
3852      if (!fn) {
3853        vm._events[event] = null;
3854        return vm
3855      }
3856      // specific handler
3857      var cb;
3858      var i = cbs.length;
3859      while (i--) {
3860        cb = cbs[i];
3861        if (cb === fn || cb.fn === fn) {
3862          cbs.splice(i, 1);
3863          break
3864        }
3865      }
3866      return vm
3867    };
3868
3869    Vue.prototype.$emit = function (event) {
3870      var vm = this;
3871      {
3872        var lowerCaseEvent = event.toLowerCase();
3873        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
3874          tip(
3875            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
3876            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
3877            "Note that HTML attributes are case-insensitive and you cannot use " +
3878            "v-on to listen to camelCase events when using in-DOM templates. " +
3879            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
3880          );
3881        }
3882      }
3883      var cbs = vm._events[event];
3884      if (cbs) {
3885        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
3886        var args = toArray(arguments, 1);
3887        var info = "event handler for \"" + event + "\"";
3888        for (var i = 0, l = cbs.length; i < l; i++) {
3889          invokeWithErrorHandling(cbs[i], vm, args, vm, info);
3890        }
3891      }
3892      return vm
3893    };
3894  }
3895
3896  /*  */
3897
3898  var activeInstance = null;
3899  var isUpdatingChildComponent = false;
3900
3901  function setActiveInstance(vm) {
3902    var prevActiveInstance = activeInstance;
3903    activeInstance = vm;
3904    return function () {
3905      activeInstance = prevActiveInstance;
3906    }
3907  }
3908
3909  function initLifecycle (vm) {
3910    var options = vm.$options;
3911
3912    // locate first non-abstract parent
3913    var parent = options.parent;
3914    if (parent && !options.abstract) {
3915      while (parent.$options.abstract && parent.$parent) {
3916        parent = parent.$parent;
3917      }
3918      parent.$children.push(vm);
3919    }
3920
3921    vm.$parent = parent;
3922    vm.$root = parent ? parent.$root : vm;
3923
3924    vm.$children = [];
3925    vm.$refs = {};
3926
3927    vm._watcher = null;
3928    vm._inactive = null;
3929    vm._directInactive = false;
3930    vm._isMounted = false;
3931    vm._isDestroyed = false;
3932    vm._isBeingDestroyed = false;
3933  }
3934
3935  function lifecycleMixin (Vue) {
3936    Vue.prototype._update = function (vnode, hydrating) {
3937      var vm = this;
3938      var prevEl = vm.$el;
3939      var prevVnode = vm._vnode;
3940      var restoreActiveInstance = setActiveInstance(vm);
3941      vm._vnode = vnode;
3942      // Vue.prototype.__patch__ is injected in entry points
3943      // based on the rendering backend used.
3944      if (!prevVnode) {
3945        // initial render
3946        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
3947      } else {
3948        // updates
3949        vm.$el = vm.__patch__(prevVnode, vnode);
3950      }
3951      restoreActiveInstance();
3952      // update __vue__ reference
3953      if (prevEl) {
3954        prevEl.__vue__ = null;
3955      }
3956      if (vm.$el) {
3957        vm.$el.__vue__ = vm;
3958      }
3959      // if parent is an HOC, update its $el as well
3960      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
3961        vm.$parent.$el = vm.$el;
3962      }
3963      // updated hook is called by the scheduler to ensure that children are
3964      // updated in a parent's updated hook.
3965    };
3966
3967    Vue.prototype.$forceUpdate = function () {
3968      var vm = this;
3969      if (vm._watcher) {

3970        vm._watcher.update();
3971      }
3972    };
3973
3974    Vue.prototype.$destroy = function () {
3975      var vm = this;
3976      if (vm._isBeingDestroyed) {
3977        return
3978      }
3979      callHook(vm, 'beforeDestroy');
3980      vm._isBeingDestroyed = true;
3981      // remove self from parent
3982      var parent = vm.$parent;
3983      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
3984        remove(parent.$children, vm);
3985      }
3986      // teardown watchers
3987      if (vm._watcher) {
3988        vm._watcher.teardown();
3989      }
3990      var i = vm._watchers.length;
3991      while (i--) {
3992        vm._watchers[i].teardown();
3993      }
3994      // remove reference from data ob
3995      // frozen object may not have observer.
3996      if (vm._data.__ob__) {
3997        vm._data.__ob__.vmCount--;
3998      }
3999      // call the last hook...
4000      vm._isDestroyed = true;
4001      // invoke destroy hooks on current rendered tree
4002      vm.__patch__(vm._vnode, null);
4003      // fire destroyed hook
4004      callHook(vm, 'destroyed');
4005      // turn off all instance listeners.
4006      vm.$off();
4007      // remove __vue__ reference
4008      if (vm.$el) {
4009        vm.$el.__vue__ = null;
4010      }
4011      // release circular reference (#6759)
4012      if (vm.$vnode) {
4013        vm.$vnode.parent = null;
4014      }
4015    };
4016  }
4017
4018  function mountComponent (
4019    vm,
4020    el,
4021    hydrating
4022  ) {
4023    vm.$el = el;
4024    if (!vm.$options.render) {
4025      vm.$options.render = createEmptyVNode;
4026      {
4027        /* istanbul ignore if */
4028        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
4029          vm.$options.el || el) {
4030          warn(
4031            'You are using the runtime-only build of Vue where the template ' +
4032            'compiler is not available. Either pre-compile the templates into ' +
4033            'render functions, or use the compiler-included build.',
4034            vm
4035          );
4036        } else {
4037          warn(
4038            'Failed to mount component: template or render function not defined.',
4039            vm
4040          );
4041        }
4042      }
4043    }
4044    callHook(vm, 'beforeMount');
4045
4046    var updateComponent;
4047    /* istanbul ignore if */
4048    if (config.performance && mark) {
4049      updateComponent = function () {
4050        var name = vm._name;
4051        var id = vm._uid;
4052        var startTag = "vue-perf-start:" + id;
4053        var endTag = "vue-perf-end:" + id;
4054
4055        mark(startTag);
4056        var vnode = vm._render();
4057        mark(endTag);
4058        measure(("vue " + name + " render"), startTag, endTag);
4059
4060        mark(startTag);
4061        vm._update(vnode, hydrating);
4062        mark(endTag);
4063        measure(("vue " + name + " patch"), startTag, endTag);
4064      };
4065    } else {
4066      updateComponent = function () {
4067        vm._update(vm._render(), hydrating);
4068      };
4069    }
4070
4071    // we set this to vm._watcher inside the watcher's constructor
4072    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
4073    // component's mounted hook), which relies on vm._watcher being already defined
4074    new Watcher(vm, updateComponent, noop, {
4075      before: function before () {
4076        if (vm._isMounted && !vm._isDestroyed) {
4077          callHook(vm, 'beforeUpdate');
4078        }
4079      }
4080    }, true /* isRenderWatcher */);
4081    hydrating = false;
4082
4083    // manually mounted instance, call mounted on self
4084    // mounted is called for render-created child components in its inserted hook
4085    if (vm.$vnode == null) {
4086      vm._isMounted = true;
4087      callHook(vm, 'mounted');
4088    }
4089    return vm
4090  }
4091
4092  function updateChildComponent (
4093    vm,
4094    propsData,
4095    listeners,
4096    parentVnode,
4097    renderChildren
4098  ) {
4099    {
4100      isUpdatingChildComponent = true;
4101    }
4102
4103    // determine whether component has slot children
4104    // we need to do this before overwriting $options._renderChildren.
4105
4106    // check if there are dynamic scopedSlots (hand-written or compiled but with
4107    // dynamic slot names). Static scoped slots compiled from template has the
4108    // "$stable" marker.
4109    var newScopedSlots = parentVnode.data.scopedSlots;
4110    var oldScopedSlots = vm.$scopedSlots;
4111    var hasDynamicScopedSlot = !!(
4112      (newScopedSlots && !newScopedSlots.$stable) ||
4113      (oldScopedSlots !== emptyObject && !oldScopedSlots.$stable) ||
4114      (newScopedSlots && vm.$scopedSlots.$key !== newScopedSlots.$key)
4115    );
4116
4117    // Any static slot children from the parent may have changed during parent's
4118    // update. Dynamic scoped slots may also have changed. In such cases, a forced
4119    // update is necessary to ensure correctness.
4120    var needsForceUpdate = !!(
4121      renderChildren ||               // has new static slots
4122      vm.$options._renderChildren ||  // has old static slots
4123      hasDynamicScopedSlot
4124    );
4125
4126    vm.$options._parentVnode = parentVnode;
4127    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
4128
4129    if (vm._vnode) { // update child tree's parent
4130      vm._vnode.parent = parentVnode;
4131    }
4132    vm.$options._renderChildren = renderChildren;
4133
4134    // update $attrs and $listeners hash
4135    // these are also reactive so they may trigger child update if the child
4136    // used them during render
4137    vm.$attrs = parentVnode.data.attrs || emptyObject;
4138    vm.$listeners = listeners || emptyObject;
4139
4140    // update props
4141    if (propsData && vm.$options.props) {
4142      toggleObserving(false);
4143      var props = vm._props;
4144      var propKeys = vm.$options._propKeys || [];
4145      for (var i = 0; i < propKeys.length; i++) {
4146        var key = propKeys[i];
4147        var propOptions = vm.$options.props; // wtf flow?
4148        props[key] = validateProp(key, propOptions, propsData, vm);
4149      }
4150      toggleObserving(true);
4151      // keep a copy of raw propsData
4152      vm.$options.propsData = propsData;
4153    }
4154
4155    // update listeners
4156    listeners = listeners || emptyObject;
4157    var oldListeners = vm.$options._parentListeners;
4158    vm.$options._parentListeners = listeners;
4159    updateComponentListeners(vm, listeners, oldListeners);
4160
4161    // resolve slots + force update if has children
4162    if (needsForceUpdate) {
4163      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
4164      vm.$forceUpdate();
4165    }
4166
4167    {
4168      isUpdatingChildComponent = false;
4169    }
4170  }
4171
4172  function isInInactiveTree (vm) {
4173    while (vm && (vm = vm.$parent)) {
4174      if (vm._inactive) { return true }
4175    }
4176    return false
4177  }
4178
4179  function activateChildComponent (vm, direct) {
4180    if (direct) {
4181      vm._directInactive = false;
4182      if (isInInactiveTree(vm)) {
4183        return
4184      }
4185    } else if (vm._directInactive) {
4186      return
4187    }
4188    if (vm._inactive || vm._inactive === null) {
4189      vm._inactive = false;
4190      for (var i = 0; i < vm.$children.length; i++) {
4191        activateChildComponent(vm.$children[i]);
4192      }
4193      callHook(vm, 'activated');
4194    }
4195  }
4196
4197  function deactivateChildComponent (vm, direct) {
4198    if (direct) {
4199      vm._directInactive = true;
4200      if (isInInactiveTree(vm)) {
4201        return
4202      }
4203    }
4204    if (!vm._inactive) {
4205      vm._inactive = true;
4206      for (var i = 0; i < vm.$children.length; i++) {
4207        deactivateChildComponent(vm.$children[i]);
4208      }
4209      callHook(vm, 'deactivated');
4210    }
4211  }
4212
4213  function callHook (vm, hook) {
4214    // #7573 disable dep collection when invoking lifecycle hooks
4215    pushTarget();
4216    var handlers = vm.$options[hook];
4217    var info = hook + " hook";
4218    if (handlers) {
4219      for (var i = 0, j = handlers.length; i < j; i++) {
4220        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
4221      }
4222    }
4223    if (vm._hasHookEvent) {
4224      vm.$emit('hook:' + hook);

4225    }
4226    popTarget();
4227  }
4228
4229  /*  */
4230
4231  var MAX_UPDATE_COUNT = 100;
4232
4233  var queue = [];
4234  var activatedChildren = [];
4235  var has = {};
4236  var circular = {};
4237  var waiting = false;
4238  var flushing = false;
4239  var index = 0;
4240
4241  /**
4242   * Reset the scheduler's state.
4243   */
4244  function resetSchedulerState () {
4245    index = queue.length = activatedChildren.length = 0;
4246    has = {};
4247    {
4248      circular = {};
4249    }
4250    waiting = flushing = false;
4251  }
4252
4253  // Async edge case #6566 requires saving the timestamp when event listeners are
4254  // attached. However, calling performance.now() has a perf overhead especially
4255  // if the page has thousands of event listeners. Instead, we take a timestamp
4256  // every time the scheduler flushes and use that for all event listeners
4257  // attached during that flush.
4258  var currentFlushTimestamp = 0;
4259
4260  // Async edge case fix requires storing an event listener's attach timestamp.
4261  var getNow = Date.now;
4262
4263  // Determine what event timestamp the browser is using. Annoyingly, the
4264  // timestamp can either be hi-res (relative to page load) or low-res
4265  // (relative to UNIX epoch), so in order to compare time we have to use the
4266  // same timestamp type when saving the flush timestamp.
4267  // All IE versions use low-res event timestamps, and have problematic clock
4268  // implementations (#9632)
4269  if (inBrowser && !isIE) {
4270    var performance = window.performance;
4271    if (
4272      performance &&
4273      typeof performance.now === 'function' &&
4274      getNow() > document.createEvent('Event').timeStamp
4275    ) {
4276      // if the event timestamp, although evaluated AFTER the Date.now(), is
4277      // smaller than it, it means the event is using a hi-res timestamp,
4278      // and we need to use the hi-res version for event listener timestamps as
4279      // well.
4280      getNow = function () { return performance.now(); };
4281    }
4282  }
4283
4284  /**
4285   * Flush both queues and run the watchers.
4286   */
4287  function flushSchedulerQueue () {
4288    currentFlushTimestamp = getNow();
4289    flushing = true;
4290    var watcher, id;
4291
4292    // Sort queue before flush.
4293    // This ensures that:
4294    // 1. Components are updated from parent to child. (because parent is always
4295    //    created before the child)
4296    // 2. A component's user watchers are run before its render watcher (because
4297    //    user watchers are created before the render watcher)
4298    // 3. If a component is destroyed during a parent component's watcher run,
4299    //    its watchers can be skipped.
4300    queue.sort(function (a, b) { return a.id - b.id; });
4301
4302    // do not cache length because more watchers might be pushed
4303    // as we run existing watchers
4304    for (index = 0; index < queue.length; index++) {
4305      watcher = queue[index];
4306      if (watcher.before) {
4307        watcher.before();
4308      }
4309      id = watcher.id;
4310      has[id] = null;
4311      watcher.run();
4312      // in dev build, check and stop circular updates.
4313      if (has[id] != null) {
4314        circular[id] = (circular[id] || 0) + 1;
4315        if (circular[id] > MAX_UPDATE_COUNT) {
4316          warn(
4317            'You may have an infinite update loop ' + (
4318              watcher.user
4319                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
4320                : "in a component render function."
4321            ),
4322            watcher.vm
4323          );
4324          break
4325        }
4326      }
4327    }
4328
4329    // keep copies of post queues before resetting state
4330    var activatedQueue = activatedChildren.slice();
4331    var updatedQueue = queue.slice();
4332
4333    resetSchedulerState();
4334
4335    // call component updated and activated hooks
4336    callActivatedHooks(activatedQueue);
4337    callUpdatedHooks(updatedQueue);
4338
4339    // devtool hook
4340    /* istanbul ignore if */
4341    if (devtools && config.devtools) {
4342      devtools.emit('flush');
4343    }
4344  }
4345
4346  function callUpdatedHooks (queue) {
4347    var i = queue.length;
4348    while (i--) {
4349      var watcher = queue[i];
4350      var vm = watcher.vm;
4351      if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
4352        callHook(vm, 'updated');
4353      }
4354    }
4355  }
4356
4357  /**
4358   * Queue a kept-alive component that was activated during patch.
4359   * The queue will be processed after the entire tree has been patched.
4360   */
4361  function queueActivatedComponent (vm) {
4362    // setting _inactive to false here so that a render function can
4363    // rely on checking whether it's in an inactive tree (e.g. router-view)
4364    vm._inactive = false;
4365    activatedChildren.push(vm);
4366  }
4367
4368  function callActivatedHooks (queue) {
4369    for (var i = 0; i < queue.length; i++) {
4370      queue[i]._inactive = true;
4371      activateChildComponent(queue[i], true /* true */);
4372    }
4373  }
4374
4375  /**
4376   * Push a watcher into the watcher queue.

4377   * Jobs with duplicate IDs will be skipped unless it's
4378   * pushed when the queue is being flushed.
4379   */
4380  function queueWatcher (watcher) {
4381    var id = watcher.id;
4382    if (has[id] == null) {
4383      has[id] = true;
4384      if (!flushing) {
4385        queue.push(watcher);
4386      } else {
4387        // if already flushing, splice the watcher based on its id
4388        // if already past its id, it will be run next immediately.
4389        var i = queue.length - 1;
4390        while (i > index && queue[i].id > watcher.id) {
4391          i--;
4392        }
4393        queue.splice(i + 1, 0, watcher);
4394      }
4395      // queue the flush
4396      if (!waiting) {
4397        waiting = true;
4398
4399        if (!config.async) {
4400          flushSchedulerQueue();
4401          return
4402        }
4403        nextTick(flushSchedulerQueue);
4404      }
4405    }
4406  }
4407
4408  /*  */
4409
4410
4411
4412  var uid$2 = 0;
4413
4414  /**
4415   * A watcher parses an expression, collects dependencies,
4416   * and fires callback when the expression value changes.
4417   * This is used for both the $watch() api and directives.
4418   */
4419  var Watcher = function Watcher (
4420    vm,
4421    expOrFn,
4422    cb,
4423    options,
4424    isRenderWatcher
4425  ) {
4426    this.vm = vm;
4427    if (isRenderWatcher) {
4428      vm._watcher = this;
4429    }
4430    vm._watchers.push(this);
4431    // options
4432    if (options) {
4433      this.deep = !!options.deep;
4434      this.user = !!options.user;
4435      this.lazy = !!options.lazy;
4436      this.sync = !!options.sync;
4437      this.before = options.before;
4438    } else {
4439      this.deep = this.user = this.lazy = this.sync = false;
4440    }
4441    this.cb = cb;
4442    this.id = ++uid$2; // uid for batching
4443    this.active = true;
4444    this.dirty = this.lazy; // for lazy watchers
4445    this.deps = [];
4446    this.newDeps = [];
4447    this.depIds = new _Set();
4448    this.newDepIds = new _Set();
4449    this.expression = expOrFn.toString();
4450    // parse expression for getter
4451    if (typeof expOrFn === 'function') {
4452      this.getter = expOrFn;
4453    } else {
4454      this.getter = parsePath(expOrFn);
4455      if (!this.getter) {
4456        this.getter = noop;
4457        warn(
4458          "Failed watching path: \"" + expOrFn + "\" " +
4459          'Watcher only accepts simple dot-delimited paths. ' +
4460          'For full control, use a function instead.',
4461          vm
4462        );
4463      }
4464    }
4465    this.value = this.lazy
4466      ? undefined
4467      : this.get();
4468  };
4469
4470  /**
4471   * Evaluate the getter, and re-collect dependencies.
4472   */
4473  Watcher.prototype.get = function get () {
4474    pushTarget(this);
4475    var value;
4476    var vm = this.vm;
4477    try {
4478      value = this.getter.call(vm, vm);
4479    } catch (e) {
4480      if (this.user) {
4481        handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
4482      } else {
4483        throw e
4484      }
4485    } finally {
4486      // "touch" every property so they are all tracked as
4487      // dependencies for deep watching
4488      if (this.deep) {
4489        traverse(value);
4490      }
4491      popTarget();
4492      this.cleanupDeps();
4493    }
4494    return value
4495  };
4496
4497  /**
4498   * Add a dependency to this directive.
4499   */
4500  Watcher.prototype.addDep = function addDep (dep) {
4501    var id = dep.id;
4502    if (!this.newDepIds.has(id)) {
4503      this.newDepIds.add(id);
4504      this.newDeps.push(dep);
4505      if (!this.depIds.has(id)) {
4506        dep.addSub(this);
4507      }
4508    }
4509  };
4510
4511  /**
4512   * Clean up for dependency collection.
4513   */
4514  Watcher.prototype.cleanupDeps = function cleanupDeps () {
4515    var i = this.deps.length;
4516    while (i--) {
4517      var dep = this.deps[i];
4518      if (!this.newDepIds.has(dep.id)) {
4519        dep.removeSub(this);
4520      }
4521    }
4522    var tmp = this.depIds;
4523    this.depIds = this.newDepIds;
4524    this.newDepIds = tmp;
4525    this.newDepIds.clear();
4526    tmp = this.deps;
4527    this.deps = this.newDeps;
4528    this.newDeps = tmp;
4529    this.newDeps.length = 0;
4530  };
4531
4532  /**
4533   * Subscriber interface.
4534   * Will be called when a dependency changes.
4535   */
4536  Watcher.prototype.update = function update () {
4537    /* istanbul ignore else */
4538    if (this.lazy) {
4539      this.dirty = true;
4540    } else if (this.sync) {
4541      this.run();
4542    } else {
4543      queueWatcher(this);
4544    }
4545  };
4546
4547  /**

4548   * Scheduler job interface.
4549   * Will be called by the scheduler.
4550   */
4551  Watcher.prototype.run = function run () {
4552    if (this.active) {
4553      var value = this.get();
4554      if (
4555        value !== this.value ||
4556        // Deep watchers and watchers on Object/Arrays should fire even
4557        // when the value is the same, because the value may
4558        // have mutated.
4559        isObject(value) ||
4560        this.deep
4561      ) {
4562        // set new value
4563        var oldValue = this.value;
4564        this.value = value;
4565        if (this.user) {
4566          try {
4567            this.cb.call(this.vm, value, oldValue);
4568          } catch (e) {
4569            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
4570          }
4571        } else {
4572          this.cb.call(this.vm, value, oldValue);
4573        }
4574      }
4575    }
4576  };
4577
4578  /**
4579   * Evaluate the value of the watcher.
4580   * This only gets called for lazy watchers.
4581   */
4582  Watcher.prototype.evaluate = function evaluate () {
4583    this.value = this.get();
4584    this.dirty = false;
4585  };
4586
4587  /**
4588   * Depend on all deps collected by this watcher.
4589   */

4590  Watcher.prototype.depend = function depend () {
4591    var i = this.deps.length;
4592    while (i--) {
4593      this.deps[i].depend();
4594    }
4595  };
4596
4597  /**
4598   * Remove self from all dependencies' subscriber list.
4599   */
4600  Watcher.prototype.teardown = function teardown () {
4601    if (this.active) {
4602      // remove self from vm's watcher list
4603      // this is a somewhat expensive operation so we skip it
4604      // if the vm is being destroyed.
4605      if (!this.vm._isBeingDestroyed) {
4606        remove(this.vm._watchers, this);
4607      }
4608      var i = this.deps.length;
4609      while (i--) {
4610        this.deps[i].removeSub(this);
4611      }
4612      this.active = false;
4613    }
4614  };
4615
4616  /*  */
4617
4618  var sharedPropertyDefinition = {
4619    enumerable: true,
4620    configurable: true,
4621    get: noop,
4622    set: noop
4623  };
4624
4625  function proxy (target, sourceKey, key) {
4626    sharedPropertyDefinition.get = function proxyGetter () {
4627      return this[sourceKey][key]
4628    };
4629    sharedPropertyDefinition.set = function proxySetter (val) {
4630      this[sourceKey][key] = val;
4631    };
4632    Object.defineProperty(target, key, sharedPropertyDefinition);
4633  }
4634
4635  function initState (vm) {
4636    vm._watchers = [];
4637    var opts = vm.$options;
4638    if (opts.props) { initProps(vm, opts.props); }
4639    if (opts.methods) { initMethods(vm, opts.methods); }
4640    if (opts.data) {
4641      initData(vm);
4642    } else {
4643      observe(vm._data = {}, true /* asRootData */);
4644    }
4645    if (opts.computed) { initComputed(vm, opts.computed); }
4646    if (opts.watch && opts.watch !== nativeWatch) {
4647      initWatch(vm, opts.watch);
4648    }
4649  }
4650
4651  function initProps (vm, propsOptions) {
4652    var propsData = vm.$options.propsData || {};
4653    var props = vm._props = {};
4654    // cache prop keys so that future props updates can iterate using Array
4655    // instead of dynamic object key enumeration.
4656    var keys = vm.$options._propKeys = [];
4657    var isRoot = !vm.$parent;
4658    // root instance props should be converted
4659    if (!isRoot) {
4660      toggleObserving(false);
4661    }
4662    var loop = function ( key ) {
4663      keys.push(key);
4664      var value = validateProp(key, propsOptions, propsData, vm);
4665      /* istanbul ignore else */
4666      {
4667        var hyphenatedKey = hyphenate(key);
4668        if (isReservedAttribute(hyphenatedKey) ||
4669            config.isReservedAttr(hyphenatedKey)) {
4670          warn(
4671            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
4672            vm
4673          );
4674        }
4675        defineReactive$$1(props, key, value, function () {
4676          if (!isRoot && !isUpdatingChildComponent) {
4677            warn(
4678              "Avoid mutating a prop directly since the value will be " +
4679              "overwritten whenever the parent component re-renders. " +
4680              "Instead, use a data or computed property based on the prop's " +
4681              "value. Prop being mutated: \"" + key + "\"",
4682              vm
4683            );
4684          }
4685        });
4686      }
4687      // static props are already proxied on the component's prototype
4688      // during Vue.extend(). We only need to proxy props defined at
4689      // instantiation here.
4690      if (!(key in vm)) {
4691        proxy(vm, "_props", key);
4692      }
4693    };
4694
4695    for (var key in propsOptions) loop( key );
4696    toggleObserving(true);
4697  }
4698
4699  function initData (vm) {
4700    var data = vm.$options.data;
4701    data = vm._data = typeof data === 'function'
4702      ? getData(data, vm)
4703      : data || {};
4704    if (!isPlainObject(data)) {
4705      data = {};
4706      warn(
4707        'data functions should return an object:\n' +
4708        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
4709        vm
4710      );
4711    }
4712    // proxy data on instance
4713    var keys = Object.keys(data);
4714    var props = vm.$options.props;
4715    var methods = vm.$options.methods;
4716    var i = keys.length;
4717    while (i--) {
4718      var key = keys[i];
4719      {
4720        if (methods && hasOwn(methods, key)) {
4721          warn(
4722            ("Method \"" + key + "\" has already been defined as a data property."),
4723            vm
4724          );
4725        }
4726      }
4727      if (props && hasOwn(props, key)) {
4728        warn(
4729          "The data property \"" + key + "\" is already declared as a prop. " +
4730          "Use prop default value instead.",
4731          vm
4732        );
4733      } else if (!isReserved(key)) {
4734        proxy(vm, "_data", key);
4735      }
4736    }
4737    // observe data
4738    observe(data, true /* asRootData */);
4739  }
4740
4741  function getData (data, vm) {
4742    // #7573 disable dep collection when invoking data getters
4743    pushTarget();
4744    try {
4745      return data.call(vm, vm)
4746    } catch (e) {
4747      handleError(e, vm, "data()");
4748      return {}
4749    } finally {
4750      popTarget();
4751    }
4752  }
4753
4754  var computedWatcherOptions = { lazy: true };
4755
4756  function initComputed (vm, computed) {
4757    // $flow-disable-line
4758    var watchers = vm._computedWatchers = Object.create(null);
4759    // computed properties are just getters during SSR
4760    var isSSR = isServerRendering();
4761
4762    for (var key in computed) {
4763      var userDef = computed[key];
4764      var getter = typeof userDef === 'function' ? userDef : userDef.get;
4765      if (getter == null) {
4766        warn(
4767          ("Getter is missing for computed property \"" + key + "\"."),
4768          vm
4769        );
4770      }
4771
4772      if (!isSSR) {
4773        // create internal watcher for the computed property.
4774        watchers[key] = new Watcher(
4775          vm,
4776          getter || noop,
4777          noop,
4778          computedWatcherOptions
4779        );
4780      }
4781
4782      // component-defined computed properties are already defined on the
4783      // component prototype. We only need to define computed properties defined
4784      // at instantiation here.
4785      if (!(key in vm)) {
4786        defineComputed(vm, key, userDef);
4787      } else {
4788        if (key in vm.$data) {
4789          warn(("The computed property \"" + key + "\" is already defined in data."), vm);
4790        } else if (vm.$options.props && key in vm.$options.props) {
4791          warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
4792        }
4793      }
4794    }
4795  }
4796
4797  function defineComputed (
4798    target,
4799    key,
4800    userDef
4801  ) {
4802    var shouldCache = !isServerRendering();
4803    if (typeof userDef === 'function') {
4804      sharedPropertyDefinition.get = shouldCache
4805        ? createComputedGetter(key)
4806        : createGetterInvoker(userDef);
4807      sharedPropertyDefinition.set = noop;
4808    } else {
4809      sharedPropertyDefinition.get = userDef.get
4810        ? shouldCache && userDef.cache !== false
4811          ? createComputedGetter(key)
4812          : createGetterInvoker(userDef.get)
4813        : noop;
4814      sharedPropertyDefinition.set = userDef.set || noop;
4815    }
4816    if (sharedPropertyDefinition.set === noop) {
4817      sharedPropertyDefinition.set = function () {
4818        warn(
4819          ("Computed property \"" + key + "\" was assigned to but it has no setter."),
4820          this
4821        );
4822      };
4823    }

4824    Object.defineProperty(target, key, sharedPropertyDefinition);
4825  }
4826
4827  function createComputedGetter (key) {
4828    return function computedGetter () {
4829      var watcher = this._computedWatchers && this._computedWatchers[key];
4830      if (watcher) {
4831        if (watcher.dirty) {
4832          watcher.evaluate();
4833        }
4834        if (Dep.target) {
4835          watcher.depend();
4836        }
4837        return watcher.value
4838      }
4839    }
4840  }
4841
4842  function createGetterInvoker(fn) {
4843    return function computedGetter () {
4844      return fn.call(this, this)
4845    }
4846  }
4847
4848  function initMethods (vm, methods) {
4849    var props = vm.$options.props;
4850    for (var key in methods) {
4851      {
4852        if (typeof methods[key] !== 'function') {
4853          warn(
4854            "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
4855            "Did you reference the function correctly?",
4856            vm
4857          );
4858        }
4859        if (props && hasOwn(props, key)) {
4860          warn(
4861            ("Method \"" + key + "\" has already been defined as a prop."),
4862            vm
4863          );
4864        }
4865        if ((key in vm) && isReserved(key)) {
4866          warn(
4867            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
4868            "Avoid defining component methods that start with _ or $."
4869          );
4870        }
4871      }
4872      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
4873    }
4874  }
4875
4876  function initWatch (vm, watch) {
4877    for (var key in watch) {
4878      var handler = watch[key];
4879      if (Array.isArray(handler)) {
4880        for (var i = 0; i < handler.length; i++) {
4881          createWatcher(vm, key, handler[i]);
4882        }
4883      } else {
4884        createWatcher(vm, key, handler);
4885      }
4886    }
4887  }
4888
4889  function createWatcher (
4890    vm,
4891    expOrFn,
4892    handler,
4893    options
4894  ) {
4895    if (isPlainObject(handler)) {
4896      options = handler;
4897      handler = handler.handler;
4898    }
4899    if (typeof handler === 'string') {
4900      handler = vm[handler];
4901    }
4902    return vm.$watch(expOrFn, handler, options)
4903  }
4904
4905  function stateMixin (Vue) {
4906    // flow somehow has problems with directly declared definition object
4907    // when using Object.defineProperty, so we have to procedurally build up
4908    // the object here.
4909    var dataDef = {};
4910    dataDef.get = function () { return this._data };
4911    var propsDef = {};
4912    propsDef.get = function () { return this._props };
4913    {
4914      dataDef.set = function () {
4915        warn(
4916          'Avoid replacing instance root $data. ' +
4917          'Use nested data properties instead.',
4918          this
4919        );
4920      };
4921      propsDef.set = function () {
4922        warn("$props is readonly.", this);
4923      };
4924    }
4925    Object.defineProperty(Vue.prototype, '$data', dataDef);
4926    Object.defineProperty(Vue.prototype, '$props', propsDef);
4927
4928    Vue.prototype.$set = set;
4929    Vue.prototype.$delete = del;
4930
4931    Vue.prototype.$watch = function (
4932      expOrFn,
4933      cb,
4934      options
4935    ) {
4936      var vm = this;
4937      if (isPlainObject(cb)) {
4938        return createWatcher(vm, expOrFn, cb, options)
4939      }
4940      options = options || {};
4941      options.user = true;
4942      var watcher = new Watcher(vm, expOrFn, cb, options);
4943      if (options.immediate) {
4944        try {
4945          cb.call(vm, watcher.value);
4946        } catch (error) {
4947          handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
4948        }
4949      }
4950      return function unwatchFn () {
4951        watcher.teardown();
4952      }
4953    };
4954  }
4955
4956  /*  */
4957
4958  var uid$3 = 0;
4959
4960  function initMixin (Vue) {
4961    Vue.prototype._init = function (options) {
4962      var vm = this;
4963      // a uid
4964      vm._uid = uid$3++;
4965
4966      var startTag, endTag;
4967      /* istanbul ignore if */
4968      if (config.performance && mark) {
4969        startTag = "vue-perf-start:" + (vm._uid);
4970        endTag = "vue-perf-end:" + (vm._uid);
4971        mark(startTag);
4972      }
4973
4974      // a flag to avoid this being observed
4975      vm._isVue = true;
4976      // merge options
4977      if (options && options._isComponent) {

4978        // optimize internal component instantiation
4979        // since dynamic options merging is pretty slow, and none of the
4980        // internal component options needs special treatment.
4981        initInternalComponent(vm, options);
4982      } else {
4983        vm.$options = mergeOptions(
4984          resolveConstructorOptions(vm.constructor),
4985          options || {},
4986          vm
4987        );
4988      }
4989      /* istanbul ignore else */
4990      {
4991        initProxy(vm);
4992      }
4993      // expose real self
4994      vm._self = vm;
4995      initLifecycle(vm);
4996      initEvents(vm);
4997      initRender(vm);
4998      callHook(vm, 'beforeCreate');
4999      initInjections(vm); // resolve injections before data/props
5000      initState(vm);
5001      initProvide(vm); // resolve provide after data/props
5002      callHook(vm, 'created');
5003
5004      /* istanbul ignore if */
5005      if (config.performance && mark) {
5006        vm._name = formatComponentName(vm, false);
5007        mark(endTag);
5008        measure(("vue " + (vm._name) + " init"), startTag, endTag);
5009      }
5010
5011      if (vm.$options.el) {
5012        vm.$mount(vm.$options.el);
5013      }
5014    };
5015  }
5016
5017  function initInternalComponent (vm, options) {
5018    var opts = vm.$options = Object.create(vm.constructor.options);
5019    // doing this because it's faster than dynamic enumeration.
5020    var parentVnode = options._parentVnode;
5021    opts.parent = options.parent;
5022    opts._parentVnode = parentVnode;
5023
5024    var vnodeComponentOptions = parentVnode.componentOptions;
5025    opts.propsData = vnodeComponentOptions.propsData;
5026    opts._parentListeners = vnodeComponentOptions.listeners;
5027    opts._renderChildren = vnodeComponentOptions.children;
5028    opts._componentTag = vnodeComponentOptions.tag;
5029
5030    if (options.render) {
5031      opts.render = options.render;
5032      opts.staticRenderFns = options.staticRenderFns;
5033    }
5034  }
5035
5036  function resolveConstructorOptions (Ctor) {
5037    var options = Ctor.options;
5038    if (Ctor.super) {
5039      var superOptions = resolveConstructorOptions(Ctor.super);
5040      var cachedSuperOptions = Ctor.superOptions;
5041      if (superOptions !== cachedSuperOptions) {
5042        // super option changed,
5043        // need to resolve new options.
5044        Ctor.superOptions = superOptions;
5045        // check if there are any late-modified/attached options (#4976)
5046        var modifiedOptions = resolveModifiedOptions(Ctor);
5047        // update base extend options
5048        if (modifiedOptions) {
5049          extend(Ctor.extendOptions, modifiedOptions);
5050        }
5051        options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
5052        if (options.name) {
5053          options.components[options.name] = Ctor;
5054        }
5055      }
5056    }
5057    return options
5058  }
5059
5060  function resolveModifiedOptions (Ctor) {
5061    var modified;
5062    var latest = Ctor.options;
5063    var sealed = Ctor.sealedOptions;
5064    for (var key in latest) {
5065      if (latest[key] !== sealed[key]) {
5066        if (!modified) { modified = {}; }
5067        modified[key] = latest[key];
5068      }
5069    }
5070    return modified
5071  }
5072
5073  function Vue (options) {
5074    if (!(this instanceof Vue)
5075    ) {
5076      warn('Vue is a constructor and should be called with the `new` keyword');
5077    }
5078    this._init(options);
5079  }
5080
5081  initMixin(Vue);
5082  stateMixin(Vue);
5083  eventsMixin(Vue);
5084  lifecycleMixin(Vue);
5085  renderMixin(Vue);
5086
5087  /*  */
5088
5089  function initUse (Vue) {
5090    Vue.use = function (plugin) {
5091      var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
5092      if (installedPlugins.indexOf(plugin) > -1) {
5093        return this
5094      }
5095
5096      // additional parameters
5097      var args = toArray(arguments, 1);
5098      args.unshift(this);
5099      if (typeof plugin.install === 'function') {
5100        plugin.install.apply(plugin, args);
5101      } else if (typeof plugin === 'function') {
5102        plugin.apply(null, args);
5103      }
5104      installedPlugins.push(plugin);
5105      return this
5106    };
5107  }
5108
5109  /*  */
5110
5111  function initMixin$1 (Vue) {
5112    Vue.mixin = function (mixin) {
5113      this.options = mergeOptions(this.options, mixin);
5114      return this
5115    };
5116  }
5117
5118  /*  */
5119
5120  function initExtend (Vue) {
5121    /**
5122     * Each instance constructor, including Vue, has a unique
5123     * cid. This enables us to create wrapped "child
5124     * constructors" for prototypal inheritance and cache them.
5125     */
5126    Vue.cid = 0;
5127    var cid = 1;
5128
5129    /**
5130     * Class inheritance
5131     */
5132    Vue.extend = function (extendOptions) {
5133      extendOptions = extendOptions || {};
5134      var Super = this;
5135      var SuperId = Super.cid;
5136      var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
5137      if (cachedCtors[SuperId]) {
5138        return cachedCtors[SuperId]
5139      }
5140
5141      var name = extendOptions.name || Super.options.name;
5142      if (name) {
5143        validateComponentName(name);
5144      }
5145
5146      var Sub = function VueComponent (options) {
5147        this._init(options);
5148      };
5149      Sub.prototype = Object.create(Super.prototype);
5150      Sub.prototype.constructor = Sub;
5151      Sub.cid = cid++;
5152      Sub.options = mergeOptions(
5153        Super.options,
5154        extendOptions
5155      );
5156      Sub['super'] = Super;
5157
5158      // For props and computed properties, we define the proxy getters on
5159      // the Vue instances at extension time, on the extended prototype. This
5160      // avoids Object.defineProperty calls for each instance created.
5161      if (Sub.options.props) {
5162        initProps$1(Sub);
5163      }
5164      if (Sub.options.computed) {
5165        initComputed$1(Sub);
5166      }
5167
5168      // allow further extension/mixin/plugin usage
5169      Sub.extend = Super.extend;
5170      Sub.mixin = Super.mixin;
5171      Sub.use = Super.use;
5172
5173      // create asset registers, so extended classes
5174      // can have their private assets too.
5175      ASSET_TYPES.forEach(function (type) {
5176        Sub[type] = Super[type];
5177      });
5178      // enable recursive self-lookup
5179      if (name) {
5180        Sub.options.components[name] = Sub;
5181      }
5182
5183      // keep a reference to the super options at extension time.
5184      // later at instantiation we can check if Super's options have
5185      // been updated.
5186      Sub.superOptions = Super.options;
5187      Sub.extendOptions = extendOptions;
5188      Sub.sealedOptions = extend({}, Sub.options);
5189

5190      // cache constructor
5191      cachedCtors[SuperId] = Sub;
5192      return Sub
5193    };
5194  }
5195
5196  function initProps$1 (Comp) {
5197    var props = Comp.options.props;
5198    for (var key in props) {
5199      proxy(Comp.prototype, "_props", key);
5200    }
5201  }
5202
5203  function initComputed$1 (Comp) {
5204    var computed = Comp.options.computed;
5205    for (var key in computed) {
5206      defineComputed(Comp.prototype, key, computed[key]);
5207    }
5208  }
5209
5210  /*  */
5211
5212  function initAssetRegisters (Vue) {
5213    /**
5214     * Create asset registration methods.
5215     */
5216    ASSET_TYPES.forEach(function (type) {
5217      Vue[type] = function (
5218        id,
5219        definition
5220      ) {
5221        if (!definition) {
5222          return this.options[type + 's'][id]
5223        } else {
5224          /* istanbul ignore if */
5225          if (type === 'component') {
5226            validateComponentName(id);
5227          }
5228          if (type === 'component' && isPlainObject(definition)) {
5229            definition.name = definition.name || id;
5230            definition = this.options._base.extend(definition);
5231          }
5232          if (type === 'directive' && typeof definition === 'function') {
5233            definition = { bind: definition, update: definition };
5234          }
5235          this.options[type + 's'][id] = definition;
5236          return definition
5237        }
5238      };
5239    });
5240  }
5241
5242  /*  */
5243
5244
5245
5246  function getComponentName (opts) {
5247    return opts && (opts.Ctor.options.name || opts.tag)
5248  }
5249
5250  function matches (pattern, name) {
5251    if (Array.isArray(pattern)) {
5252      return pattern.indexOf(name) > -1
5253    } else if (typeof pattern === 'string') {
5254      return pattern.split(',').indexOf(name) > -1
5255    } else if (isRegExp(pattern)) {
5256      return pattern.test(name)
5257    }
5258    /* istanbul ignore next */
5259    return false
5260  }
5261
5262  function pruneCache (keepAliveInstance, filter) {
5263    var cache = keepAliveInstance.cache;
5264    var keys = keepAliveInstance.keys;
5265    var _vnode = keepAliveInstance._vnode;
5266    for (var key in cache) {
5267      var cachedNode = cache[key];
5268      if (cachedNode) {
5269        var name = getComponentName(cachedNode.componentOptions);
5270        if (name && !filter(name)) {
5271          pruneCacheEntry(cache, key, keys, _vnode);
5272        }
5273      }
5274    }
5275  }
5276
5277  function pruneCacheEntry (
5278    cache,
5279    key,
5280    keys,
5281    current
5282  ) {
5283    var cached$$1 = cache[key];
5284    if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {
5285      cached$$1.componentInstance.$destroy();
5286    }
5287    cache[key] = null;
5288    remove(keys, key);
5289  }
5290
5291  var patternTypes = [String, RegExp, Array];
5292
5293  var KeepAlive = {
5294    name: 'keep-alive',
5295    abstract: true,
5296
5297    props: {
5298      include: patternTypes,
5299      exclude: patternTypes,
5300      max: [String, Number]
5301    },
5302
5303    created: function created () {
5304      this.cache = Object.create(null);
5305      this.keys = [];
5306    },
5307
5308    destroyed: function destroyed () {
5309      for (var key in this.cache) {
5310        pruneCacheEntry(this.cache, key, this.keys);
5311      }
5312    },
5313
5314    mounted: function mounted () {
5315      var this$1 = this;
5316
5317      this.$watch('include', function (val) {
5318        pruneCache(this$1, function (name) { return matches(val, name); });
5319      });
5320      this.$watch('exclude', function (val) {
5321        pruneCache(this$1, function (name) { return !matches(val, name); });
5322      });
5323    },
5324
5325    render: function render () {
5326      var slot = this.$slots.default;
5327      var vnode = getFirstComponentChild(slot);
5328      var componentOptions = vnode && vnode.componentOptions;
5329      if (componentOptions) {
5330        // check pattern
5331        var name = getComponentName(componentOptions);
5332        var ref = this;
5333        var include = ref.include;
5334        var exclude = ref.exclude;
5335        if (
5336          // not included
5337          (include && (!name || !matches(include, name))) ||
5338          // excluded
5339          (exclude && name && matches(exclude, name))
5340        ) {
5341          return vnode
5342        }
5343
5344        var ref$1 = this;
5345        var cache = ref$1.cache;
5346        var keys = ref$1.keys;
5347        var key = vnode.key == null
5348          // same constructor may get registered as different local components
5349          // so cid alone is not enough (#3269)
5350          ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
5351          : vnode.key;
5352        if (cache[key]) {

5353          vnode.componentInstance = cache[key].componentInstance;
5354          // make current key freshest
5355          remove(keys, key);
5356          keys.push(key);
5357        } else {
5358          cache[key] = vnode;
5359          keys.push(key);
5360          // prune oldest entry
5361          if (this.max && keys.length > parseInt(this.max)) {
5362            pruneCacheEntry(cache, keys[0], keys, this._vnode);
5363          }
5364        }
5365
5366        vnode.data.keepAlive = true;
5367      }
5368      return vnode || (slot && slot[0])
5369    }
5370  };
5371
5372  var builtInComponents = {
5373    KeepAlive: KeepAlive
5374  };
5375
5376  /*  */
5377
5378  function initGlobalAPI (Vue) {
5379    // config
5380    var configDef = {};
5381    configDef.get = function () { return config; };
5382    {
5383      configDef.set = function () {
5384        warn(
5385          'Do not replace the Vue.config object, set individual fields instead.'
5386        );
5387      };
5388    }
5389    Object.defineProperty(Vue, 'config', configDef);
5390
5391    // exposed util methods.
5392    // NOTE: these are not considered part of the public API - avoid relying on
5393    // them unless you are aware of the risk.
5394    Vue.util = {
5395      warn: warn,
5396      extend: extend,
5397      mergeOptions: mergeOptions,
5398      defineReactive: defineReactive$$1
5399    };
5400
5401    Vue.set = set;
5402    Vue.delete = del;
5403    Vue.nextTick = nextTick;
5404
5405    // 2.6 explicit observable API
5406    Vue.observable = function (obj) {
5407      observe(obj);
5408      return obj
5409    };
5410
5411    Vue.options = Object.create(null);
5412    ASSET_TYPES.forEach(function (type) {
5413      Vue.options[type + 's'] = Object.create(null);
5414    });
5415
5416    // this is used to identify the "base" constructor to extend all plain-object
5417    // components with in Weex's multi-instance scenarios.
5418    Vue.options._base = Vue;
5419
5420    extend(Vue.options.components, builtInComponents);
5421
5422    initUse(Vue);
5423    initMixin$1(Vue);
5424    initExtend(Vue);
5425    initAssetRegisters(Vue);
5426  }
5427
5428  initGlobalAPI(Vue);
5429
5430  Object.defineProperty(Vue.prototype, '$isServer', {
5431    get: isServerRendering
5432  });
5433
5434  Object.defineProperty(Vue.prototype, '$ssrContext', {
5435    get: function get () {
5436      /* istanbul ignore next */
5437      return this.$vnode && this.$vnode.ssrContext
5438    }
5439  });
5440
5441  // expose FunctionalRenderContext for ssr runtime helper installation
5442  Object.defineProperty(Vue, 'FunctionalRenderContext', {
5443    value: FunctionalRenderContext
5444  });
5445
5446  Vue.version = '2.6.11';
5447
5448  /*  */
5449
5450  // these are reserved for web because they are directly compiled away
5451  // during template compilation
5452  var isReservedAttr = makeMap('style,class');
5453
5454  // attributes that should be using props for binding
5455  var acceptValue = makeMap('input,textarea,option,select,progress');
5456  var mustUseProp = function (tag, type, attr) {
5457    return (
5458      (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
5459      (attr === 'selected' && tag === 'option') ||
5460      (attr === 'checked' && tag === 'input') ||
5461      (attr === 'muted' && tag === 'video')
5462    )
5463  };
5464
5465  var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');
5466
5467  var isValidContentEditableValue = makeMap('events,caret,typing,plaintext-only');
5468
5469  var convertEnumeratedValue = function (key, value) {
5470    return isFalsyAttrValue(value) || value === 'false'
5471      ? 'false'
5472      // allow arbitrary string value for contenteditable
5473      : key === 'contenteditable' && isValidContentEditableValue(value)
5474        ? value
5475        : 'true'
5476  };
5477
5478  var isBooleanAttr = makeMap(
5479    'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
5480    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
5481    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
5482    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
5483    'required,reversed,scoped,seamless,selected,sortable,translate,' +
5484    'truespeed,typemustmatch,visible'
5485  );
5486
5487  var xlinkNS = 'http://www.w3.org/1999/xlink';
5488
5489  var isXlink = function (name) {
5490    return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
5491  };
5492
5493  var getXlinkProp = function (name) {
5494    return isXlink(name) ? name.slice(6, name.length) : ''
5495  };
5496
5497  var isFalsyAttrValue = function (val) {
5498    return val == null || val === false
5499  };
5500
5501  /*  */
5502
5503  function genClassForVnode (vnode) {
5504    var data = vnode.data;
5505    var parentNode = vnode;
5506    var childNode = vnode;
5507    while (isDef(childNode.componentInstance)) {
5508      childNode = childNode.componentInstance._vnode;
5509      if (childNode && childNode.data) {
5510        data = mergeClassData(childNode.data, data);
5511      }
5512    }
5513    while (isDef(parentNode = parentNode.parent)) {
5514      if (parentNode && parentNode.data) {
5515        data = mergeClassData(data, parentNode.data);
5516      }
5517    }
5518    return renderClass(data.staticClass, data.class)
5519  }
5520
5521  function mergeClassData (child, parent) {
5522    return {
5523      staticClass: concat(child.staticClass, parent.staticClass),
5524      class: isDef(child.class)
5525        ? [child.class, parent.class]
5526        : parent.class
5527    }
5528  }
5529
5530  function renderClass (
5531    staticClass,
5532    dynamicClass
5533  ) {
5534    if (isDef(staticClass) || isDef(dynamicClass)) {
5535      return concat(staticClass, stringifyClass(dynamicClass))
5536    }
5537    /* istanbul ignore next */
5538    return ''
5539  }
5540
5541  function concat (a, b) {
5542    return a ? b ? (a + ' ' + b) : a : (b || '')
5543  }
5544
5545  function stringifyClass (value) {
5546    if (Array.isArray(value)) {
5547      return stringifyArray(value)
5548    }
5549    if (isObject(value)) {
5550      return stringifyObject(value)
5551    }
5552    if (typeof value === 'string') {
5553      return value
5554    }
5555    /* istanbul ignore next */
5556    return ''
5557  }
5558
5559  function stringifyArray (value) {
5560    var res = '';
5561    var stringified;
5562    for (var i = 0, l = value.length; i < l; i++) {
5563      if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
5564        if (res) { res += ' '; }
5565        res += stringified;
5566      }
5567    }
5568    return res
5569  }
5570
5571  function stringifyObject (value) {
5572    var res = '';
5573    for (var key in value) {
5574      if (value[key]) {
5575        if (res) { res += ' '; }
5576        res += key;
5577      }
5578    }
5579    return res
5580  }
5581
5582  /*  */
5583
5584  var namespaceMap = {
5585    svg: 'http://www.w3.org/2000/svg',
5586    math: 'http://www.w3.org/1998/Math/MathML'
5587  };
5588
5589  var isHTMLTag = makeMap(
5590    'html,body,base,head,link,meta,style,title,' +
5591    'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
5592    'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
5593    'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
5594    's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
5595    'embed,object,param,source,canvas,script,noscript,del,ins,' +
5596    'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
5597    'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
5598    'output,progress,select,textarea,' +
5599    'details,dialog,menu,menuitem,summary,' +
5600    'content,element,shadow,template,blockquote,iframe,tfoot'
5601  );
5602
5603  // this map is intentionally selective, only covering SVG elements that may
5604  // contain child elements.
5605  var isSVG = makeMap(
5606    'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
5607    'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
5608    'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
5609    true
5610  );
5611
5612  var isPreTag = function (tag) { return tag === 'pre'; };
5613
5614  var isReservedTag = function (tag) {
5615    return isHTMLTag(tag) || isSVG(tag)
5616  };
5617
5618  function getTagNamespace (tag) {
5619    if (isSVG(tag)) {
5620      return 'svg'
5621    }
5622    // basic support for MathML
5623    // note it doesn't support other MathML elements being component roots
5624    if (tag === 'math') {
5625      return 'math'
5626    }
5627  }
5628
5629  var unknownElementCache = Object.create(null);
5630  function isUnknownElement (tag) {
5631    /* istanbul ignore if */
5632    if (!inBrowser) {
5633      return true
5634    }
5635    if (isReservedTag(tag)) {
5636      return false
5637    }
5638    tag = tag.toLowerCase();
5639    /* istanbul ignore if */
5640    if (unknownElementCache[tag] != null) {
5641      return unknownElementCache[tag]
5642    }
5643    var el = document.createElement(tag);
5644    if (tag.indexOf('-') > -1) {
5645      // http://stackoverflow.com/a/28210364/1070244
5646      return (unknownElementCache[tag] = (
5647        el.constructor === window.HTMLUnknownElement ||
5648        el.constructor === window.HTMLElement
5649      ))
5650    } else {
5651      return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
5652    }
5653  }
5654
5655  var isTextInputType = makeMap('text,number,password,search,email,tel,url');
5656
5657  /*  */
5658
5659  /**
5660   * Query an element selector if it's not an element already.
5661   */
5662  function query (el) {
5663    if (typeof el === 'string') {
5664      var selected = document.querySelector(el);
5665      if (!selected) {
5666        warn(
5667          'Cannot find element: ' + el
5668        );
5669        return document.createElement('div')
5670      }
5671      return selected
5672    } else {
5673      return el
5674    }
5675  }
5676
5677  /*  */
5678
5679  function createElement$1 (tagName, vnode) {
5680    var elm = document.createElement(tagName);
5681    if (tagName !== 'select') {
5682      return elm
5683    }
5684    // false or null will remove the attribute but undefined will not
5685    if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
5686      elm.setAttribute('multiple', 'multiple');
5687    }
5688    return elm
5689  }
5690
5691  function createElementNS (namespace, tagName) {
5692    return document.createElementNS(namespaceMap[namespace], tagName)
5693  }
5694
5695  function createTextNode (text) {
5696    return document.createTextNode(text)
5697  }
5698
5699  function createComment (text) {
5700    return document.createComment(text)
5701  }
5702
5703  function insertBefore (parentNode, newNode, referenceNode) {
5704    parentNode.insertBefore(newNode, referenceNode);
5705  }
5706
5707  function removeChild (node, child) {
5708    node.removeChild(child);
5709  }
5710
5711  function appendChild (node, child) {
5712    node.appendChild(child);
5713  }
5714
5715  function parentNode (node) {
5716    return node.parentNode
5717  }
5718
5719  function nextSibling (node) {
5720    return node.nextSibling
5721  }
5722
5723  function tagName (node) {
5724    return node.tagName
5725  }
5726
5727  function setTextContent (node, text) {
5728    node.textContent = text;
5729  }
5730
5731  function setStyleScope (node, scopeId) {
5732    node.setAttribute(scopeId, '');
5733  }
5734
5735  var nodeOps = /*#__PURE__*/Object.freeze({
5736    createElement: createElement$1,
5737    createElementNS: createElementNS,
5738    createTextNode: createTextNode,
5739    createComment: createComment,
5740    insertBefore: insertBefore,
5741    removeChild: removeChild,
5742    appendChild: appendChild,
5743    parentNode: parentNode,
5744    nextSibling: nextSibling,
5745    tagName: tagName,
5746    setTextContent: setTextContent,
5747    setStyleScope: setStyleScope
5748  });
5749
5750  /*  */
5751
5752  var ref = {
5753    create: function create (_, vnode) {
5754      registerRef(vnode);
5755    },
5756    update: function update (oldVnode, vnode) {
5757      if (oldVnode.data.ref !== vnode.data.ref) {
5758        registerRef(oldVnode, true);
5759        registerRef(vnode);
5760      }
5761    },
5762    destroy: function destroy (vnode) {
5763      registerRef(vnode, true);
5764    }
5765  };
5766
5767  function registerRef (vnode, isRemoval) {
5768    var key = vnode.data.ref;
5769    if (!isDef(key)) { return }
5770
5771    var vm = vnode.context;
5772    var ref = vnode.componentInstance || vnode.elm;
5773    var refs = vm.$refs;
5774    if (isRemoval) {
5775      if (Array.isArray(refs[key])) {
5776        remove(refs[key], ref);
5777      } else if (refs[key] === ref) {
5778        refs[key] = undefined;
5779      }
5780    } else {
5781      if (vnode.data.refInFor) {
5782        if (!Array.isArray(refs[key])) {
5783          refs[key] = [ref];
5784        } else if (refs[key].indexOf(ref) < 0) {
5785          // $flow-disable-line
5786          refs[key].push(ref);
5787        }
5788      } else {
5789        refs[key] = ref;
5790      }
5791    }
5792  }
5793
5794  /**
5795   * Virtual DOM patching algorithm based on Snabbdom by
5796   * Simon Friis Vindum (@paldepind)
5797   * Licensed under the MIT License
5798   * https://github.com/paldepind/snabbdom/blob/master/LICENSE
5799   *
5800   * modified by Evan You (@yyx990803)
5801   *
5802   * Not type-checking this because this file is perf-critical and the cost
5803   * of making flow understand it is not worth it.
5804   */
5805
5806  var emptyNode = new VNode('', {}, []);
5807
5808  var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];
5809
5810  function sameVnode (a, b) {
5811    return (

5812      a.key === b.key && (
5813        (
5814          a.tag === b.tag &&
5815          a.isComment === b.isComment &&
5816          isDef(a.data) === isDef(b.data) &&
5817          sameInputType(a, b)
5818        ) || (
5819          isTrue(a.isAsyncPlaceholder) &&
5820          a.asyncFactory === b.asyncFactory &&
5821          isUndef(b.asyncFactory.error)
5822        )
5823      )
5824    )
5825  }
5826
5827  function sameInputType (a, b) {
5828    if (a.tag !== 'input') { return true }
5829    var i;
5830    var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
5831    var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
5832    return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
5833  }
5834
5835  function createKeyToOldIdx (children, beginIdx, endIdx) {
5836    var i, key;
5837    var map = {};
5838    for (i = beginIdx; i <= endIdx; ++i) {
5839      key = children[i].key;
5840      if (isDef(key)) { map[key] = i; }
5841    }
5842    return map
5843  }
5844
5845  function createPatchFunction (backend) {
5846    var i, j;
5847    var cbs = {};
5848
5849    var modules = backend.modules;
5850    var nodeOps = backend.nodeOps;
5851
5852    for (i = 0; i < hooks.length; ++i) {
5853      cbs[hooks[i]] = [];
5854      for (j = 0; j < modules.length; ++j) {
5855        if (isDef(modules[j][hooks[i]])) {
5856          cbs[hooks[i]].push(modules[j][hooks[i]]);
5857        }
5858      }
5859    }
5860
5861    function emptyNodeAt (elm) {
5862      return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
5863    }
5864
5865    function createRmCb (childElm, listeners) {
5866      function remove$$1 () {
5867        if (--remove$$1.listeners === 0) {
5868          removeNode(childElm);
5869        }
5870      }
5871      remove$$1.listeners = listeners;
5872      return remove$$1
5873    }
5874
5875    function removeNode (el) {
5876      var parent = nodeOps.parentNode(el);
5877      // element may have already been removed due to v-html / v-text
5878      if (isDef(parent)) {
5879        nodeOps.removeChild(parent, el);
5880      }
5881    }
5882
5883    function isUnknownElement$$1 (vnode, inVPre) {
5884      return (
5885        !inVPre &&
5886        !vnode.ns &&
5887        !(
5888          config.ignoredElements.length &&
5889          config.ignoredElements.some(function (ignore) {
5890            return isRegExp(ignore)
5891              ? ignore.test(vnode.tag)
5892              : ignore === vnode.tag
5893          })
5894        ) &&
5895        config.isUnknownElement(vnode.tag)
5896      )
5897    }
5898
5899    var creatingElmInVPre = 0;
5900
5901    function createElm (
5902      vnode,
5903      insertedVnodeQueue,
5904      parentElm,
5905      refElm,
5906      nested,
5907      ownerArray,
5908      index
5909    ) {

5910      if (isDef(vnode.elm) && isDef(ownerArray)) {
5911        // This vnode was used in a previous render!
5912        // now it's used as a new node, overwriting its elm would cause
5913        // potential patch errors down the road when it's used as an insertion
5914        // reference node. Instead, we clone the node on-demand before creating
5915        // associated DOM element for it.
5916        vnode = ownerArray[index] = cloneVNode(vnode);
5917      }
5918
5919      vnode.isRootInsert = !nested; // for transition enter check
5920      if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
5921        return
5922      }
5923
5924      var data = vnode.data;
5925      var children = vnode.children;
5926      var tag = vnode.tag;
5927      if (isDef(tag)) {
5928        {
5929          if (data && data.pre) {
5930            creatingElmInVPre++;
5931          }
5932          if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
5933            warn(
5934              'Unknown custom element: <' + tag + '> - did you ' +
5935              'register the component correctly? For recursive components, ' +
5936              'make sure to provide the "name" option.',
5937              vnode.context
5938            );
5939          }
5940        }
5941
5942        vnode.elm = vnode.ns
5943          ? nodeOps.createElementNS(vnode.ns, tag)
5944          : nodeOps.createElement(tag, vnode);
5945        setScope(vnode);
5946
5947        /* istanbul ignore if */
5948        {
5949          createChildren(vnode, children, insertedVnodeQueue);
5950          if (isDef(data)) {
5951            invokeCreateHooks(vnode, insertedVnodeQueue);
5952          }
5953          insert(parentElm, vnode.elm, refElm);
5954        }
5955
5956        if (data && data.pre) {
5957          creatingElmInVPre--;
5958        }
5959      } else if (isTrue(vnode.isComment)) {
5960        vnode.elm = nodeOps.createComment(vnode.text);
5961        insert(parentElm, vnode.elm, refElm);
5962      } else {
5963        vnode.elm = nodeOps.createTextNode(vnode.text);
5964        insert(parentElm, vnode.elm, refElm);
5965      }
5966    }
5967
5968    function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
5969      var i = vnode.data;
5970      if (isDef(i)) {
5971        var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
5972        if (isDef(i = i.hook) && isDef(i = i.init)) {
5973          i(vnode, false /* hydrating */);
5974        }
5975        // after calling the init hook, if the vnode is a child component
5976        // it should've created a child instance and mounted it. the child
5977        // component also has set the placeholder vnode's elm.
5978        // in that case we can just return the element and be done.

5979        if (isDef(vnode.componentInstance)) {
5980          initComponent(vnode, insertedVnodeQueue);
5981          insert(parentElm, vnode.elm, refElm);
5982          if (isTrue(isReactivated)) {
5983            reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
5984          }
5985          return true
5986        }
5987      }
5988    }
5989
5990    function initComponent (vnode, insertedVnodeQueue) {
5991      if (isDef(vnode.data.pendingInsert)) {
5992        insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
5993        vnode.data.pendingInsert = null;
5994      }
5995      vnode.elm = vnode.componentInstance.$el;
5996      if (isPatchable(vnode)) {
5997        invokeCreateHooks(vnode, insertedVnodeQueue);
5998        setScope(vnode);
5999      } else {
6000        // empty component root.
6001        // skip all element-related modules except for ref (#3455)
6002        registerRef(vnode);
6003        // make sure to invoke the insert hook
6004        insertedVnodeQueue.push(vnode);
6005      }
6006    }
6007
6008    function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
6009      var i;
6010      // hack for #4339: a reactivated component with inner transition
6011      // does not trigger because the inner node's created hooks are not called
6012      // again. It's not ideal to involve module-specific logic in here but
6013      // there doesn't seem to be a better way to do it.
6014      var innerNode = vnode;
6015      while (innerNode.componentInstance) {
6016        innerNode = innerNode.componentInstance._vnode;
6017        if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
6018          for (i = 0; i < cbs.activate.length; ++i) {
6019            cbs.activate[i](emptyNode, innerNode);
6020          }
6021          insertedVnodeQueue.push(innerNode);
6022          break
6023        }
6024      }
6025      // unlike a newly created component,
6026      // a reactivated keep-alive component doesn't insert itself
6027      insert(parentElm, vnode.elm, refElm);
6028    }
6029
6030    function insert (parent, elm, ref$$1) {
6031      if (isDef(parent)) {
6032        if (isDef(ref$$1)) {
6033          if (nodeOps.parentNode(ref$$1) === parent) {
6034            nodeOps.insertBefore(parent, elm, ref$$1);
6035          }
6036        } else {
6037          nodeOps.appendChild(parent, elm);
6038        }
6039      }
6040    }
6041
6042    function createChildren (vnode, children, insertedVnodeQueue) {
6043      if (Array.isArray(children)) {
6044        {
6045          checkDuplicateKeys(children);
6046        }
6047        for (var i = 0; i < children.length; ++i) {
6048          createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
6049        }
6050      } else if (isPrimitive(vnode.text)) {
6051        nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
6052      }
6053    }
6054
6055    function isPatchable (vnode) {
6056      while (vnode.componentInstance) {
6057        vnode = vnode.componentInstance._vnode;
6058      }
6059      return isDef(vnode.tag)
6060    }
6061
6062    function invokeCreateHooks (vnode, insertedVnodeQueue) {
6063      for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
6064        cbs.create[i$1](emptyNode, vnode);
6065      }
6066      i = vnode.data.hook; // Reuse variable
6067      if (isDef(i)) {
6068        if (isDef(i.create)) { i.create(emptyNode, vnode); }
6069        if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
6070      }
6071    }
6072
6073    // set scope id attribute for scoped CSS.
6074    // this is implemented as a special case to avoid the overhead
6075    // of going through the normal attribute patching process.
6076    function setScope (vnode) {
6077      var i;
6078      if (isDef(i = vnode.fnScopeId)) {
6079        nodeOps.setStyleScope(vnode.elm, i);
6080      } else {
6081        var ancestor = vnode;
6082        while (ancestor) {
6083          if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
6084            nodeOps.setStyleScope(vnode.elm, i);
6085          }
6086          ancestor = ancestor.parent;
6087        }
6088      }
6089      // for slot content they should also get the scopeId from the host instance.
6090      if (isDef(i = activeInstance) &&
6091        i !== vnode.context &&
6092        i !== vnode.fnContext &&
6093        isDef(i = i.$options._scopeId)
6094      ) {
6095        nodeOps.setStyleScope(vnode.elm, i);
6096      }
6097    }
6098
6099    function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
6100      for (; startIdx <= endIdx; ++startIdx) {
6101        createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
6102      }
6103    }
6104
6105    function invokeDestroyHook (vnode) {
6106      var i, j;
6107      var data = vnode.data;
6108      if (isDef(data)) {
6109        if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
6110        for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
6111      }
6112      if (isDef(i = vnode.children)) {
6113        for (j = 0; j < vnode.children.length; ++j) {
6114          invokeDestroyHook(vnode.children[j]);
6115        }
6116      }
6117    }
6118
6119    function removeVnodes (vnodes, startIdx, endIdx) {
6120      for (; startIdx <= endIdx; ++startIdx) {
6121        var ch = vnodes[startIdx];
6122        if (isDef(ch)) {
6123          if (isDef(ch.tag)) {
6124            removeAndInvokeRemoveHook(ch);
6125            invokeDestroyHook(ch);
6126          } else { // Text node
6127            removeNode(ch.elm);
6128          }
6129        }
6130      }
6131    }
6132
6133    function removeAndInvokeRemoveHook (vnode, rm) {
6134      if (isDef(rm) || isDef(vnode.data)) {
6135        var i;
6136        var listeners = cbs.remove.length + 1;
6137        if (isDef(rm)) {
6138          // we have a recursively passed down rm callback
6139          // increase the listeners count
6140          rm.listeners += listeners;
6141        } else {
6142          // directly removing
6143          rm = createRmCb(vnode.elm, listeners);
6144        }
6145        // recursively invoke hooks on child component root node
6146        if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
6147          removeAndInvokeRemoveHook(i, rm);
6148        }
6149        for (i = 0; i < cbs.remove.length; ++i) {

6150          cbs.remove[i](vnode, rm);
6151        }
6152        if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
6153          i(vnode, rm);
6154        } else {
6155          rm();
6156        }
6157      } else {
6158        removeNode(vnode.elm);
6159      }
6160    }
6161
6162    function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
6163      var oldStartIdx = 0;
6164      var newStartIdx = 0;
6165      var oldEndIdx = oldCh.length - 1;
6166      var oldStartVnode = oldCh[0];
6167      var oldEndVnode = oldCh[oldEndIdx];
6168      var newEndIdx = newCh.length - 1;
6169      var newStartVnode = newCh[0];
6170      var newEndVnode = newCh[newEndIdx];
6171      var oldKeyToIdx, idxInOld, vnodeToMove, refElm;
6172
6173      // removeOnly is a special flag used only by <transition-group>
6174      // to ensure removed elements stay in correct relative positions
6175      // during leaving transitions
6176      var canMove = !removeOnly;
6177
6178      {
6179        checkDuplicateKeys(newCh);
6180      }
6181
6182      while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
6183        if (isUndef(oldStartVnode)) {
6184          oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
6185        } else if (isUndef(oldEndVnode)) {
6186          oldEndVnode = oldCh[--oldEndIdx];
6187        } else if (sameVnode(oldStartVnode, newStartVnode)) {
6188          patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
6189          oldStartVnode = oldCh[++oldStartIdx];
6190          newStartVnode = newCh[++newStartIdx];
6191        } else if (sameVnode(oldEndVnode, newEndVnode)) {
6192          patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
6193          oldEndVnode = oldCh[--oldEndIdx];
6194          newEndVnode = newCh[--newEndIdx];
6195        } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
6196          patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
6197          canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
6198          oldStartVnode = oldCh[++oldStartIdx];
6199          newEndVnode = newCh[--newEndIdx];
6200        } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
6201          patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
6202          canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
6203          oldEndVnode = oldCh[--oldEndIdx];
6204          newStartVnode = newCh[++newStartIdx];
6205        } else {
6206          if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
6207          idxInOld = isDef(newStartVnode.key)
6208            ? oldKeyToIdx[newStartVnode.key]
6209            : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
6210          if (isUndef(idxInOld)) { // New element
6211            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
6212          } else {
6213            vnodeToMove = oldCh[idxInOld];
6214            if (sameVnode(vnodeToMove, newStartVnode)) {
6215              patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
6216              oldCh[idxInOld] = undefined;
6217              canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
6218            } else {
6219              // same key but different element. treat as new element
6220              createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
6221            }
6222          }
6223          newStartVnode = newCh[++newStartIdx];
6224        }
6225      }
6226      if (oldStartIdx > oldEndIdx) {
6227        refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
6228        addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
6229      } else if (newStartIdx > newEndIdx) {
6230        removeVnodes(oldCh, oldStartIdx, oldEndIdx);
6231      }
6232    }
6233
6234    function checkDuplicateKeys (children) {
6235      var seenKeys = {};
6236      for (var i = 0; i < children.length; i++) {
6237        var vnode = children[i];
6238        var key = vnode.key;
6239        if (isDef(key)) {
6240          if (seenKeys[key]) {
6241            warn(
6242              ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
6243              vnode.context
6244            );
6245          } else {
6246            seenKeys[key] = true;
6247          }
6248        }
6249      }
6250    }
6251
6252    function findIdxInOld (node, oldCh, start, end) {
6253      for (var i = start; i < end; i++) {
6254        var c = oldCh[i];

6255        if (isDef(c) && sameVnode(node, c)) { return i }
6256      }
6257    }
6258
6259    function patchVnode (
6260      oldVnode,
6261      vnode,
6262      insertedVnodeQueue,
6263      ownerArray,
6264      index,
6265      removeOnly
6266    ) {
6267      if (oldVnode === vnode) {
6268        return
6269      }
6270
6271      if (isDef(vnode.elm) && isDef(ownerArray)) {
6272        // clone reused vnode
6273        vnode = ownerArray[index] = cloneVNode(vnode);
6274      }
6275
6276      var elm = vnode.elm = oldVnode.elm;
6277
6278      if (isTrue(oldVnode.isAsyncPlaceholder)) {
6279        if (isDef(vnode.asyncFactory.resolved)) {
6280          hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
6281        } else {
6282          vnode.isAsyncPlaceholder = true;
6283        }
6284        return
6285      }
6286
6287      // reuse element for static trees.
6288      // note we only do this if the vnode is cloned -
6289      // if the new node is not cloned it means the render functions have been
6290      // reset by the hot-reload-api and we need to do a proper re-render.
6291      if (isTrue(vnode.isStatic) &&
6292        isTrue(oldVnode.isStatic) &&
6293        vnode.key === oldVnode.key &&
6294        (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
6295      ) {
6296        vnode.componentInstance = oldVnode.componentInstance;
6297        return
6298      }
6299
6300      var i;
6301      var data = vnode.data;
6302      if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
6303        i(oldVnode, vnode);
6304      }
6305
6306      var oldCh = oldVnode.children;
6307      var ch = vnode.children;
6308      if (isDef(data) && isPatchable(vnode)) {
6309        for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
6310        if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
6311      }
6312      if (isUndef(vnode.text)) {
6313        if (isDef(oldCh) && isDef(ch)) {
6314          if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
6315        } else if (isDef(ch)) {
6316          {
6317            checkDuplicateKeys(ch);
6318          }
6319          if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
6320          addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
6321        } else if (isDef(oldCh)) {
6322          removeVnodes(oldCh, 0, oldCh.length - 1);
6323        } else if (isDef(oldVnode.text)) {
6324          nodeOps.setTextContent(elm, '');
6325        }
6326      } else if (oldVnode.text !== vnode.text) {
6327        nodeOps.setTextContent(elm, vnode.text);
6328      }
6329      if (isDef(data)) {
6330        if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
6331      }
6332    }
6333
6334    function invokeInsertHook (vnode, queue, initial) {
6335      // delay insert hooks for component root nodes, invoke them after the
6336      // element is really inserted
6337      if (isTrue(initial) && isDef(vnode.parent)) {
6338        vnode.parent.data.pendingInsert = queue;
6339      } else {
6340        for (var i = 0; i < queue.length; ++i) {
6341          queue[i].data.hook.insert(queue[i]);
6342        }
6343      }
6344    }
6345
6346    var hydrationBailed = false;
6347    // list of modules that can skip create hook during hydration because they
6348    // are already rendered on the client or has no need for initialization
6349    // Note: style is excluded because it relies on initial clone for future
6350    // deep updates (#7063).
6351    var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');
6352
6353    // Note: this is a browser-only function so we can assume elms are DOM nodes.
6354    function hydrate (elm, vnode, insertedVnodeQueue, inVPre) {
6355      var i;
6356      var tag = vnode.tag;
6357      var data = vnode.data;
6358      var children = vnode.children;
6359      inVPre = inVPre || (data && data.pre);
6360      vnode.elm = elm;
6361
6362      if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
6363        vnode.isAsyncPlaceholder = true;
6364        return true
6365      }
6366      // assert node match
6367      {
6368        if (!assertNodeMatch(elm, vnode, inVPre)) {
6369          return false
6370        }
6371      }
6372      if (isDef(data)) {
6373        if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
6374        if (isDef(i = vnode.componentInstance)) {
6375          // child component. it should have hydrated its own tree.
6376          initComponent(vnode, insertedVnodeQueue);
6377          return true
6378        }
6379      }
6380      if (isDef(tag)) {
6381        if (isDef(children)) {
6382          // empty element, allow client to pick up and populate children
6383          if (!elm.hasChildNodes()) {
6384            createChildren(vnode, children, insertedVnodeQueue);
6385          } else {
6386            // v-html and domProps: innerHTML
6387            if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
6388              if (i !== elm.innerHTML) {
6389                /* istanbul ignore if */
6390                if (typeof console !== 'undefined' &&
6391                  !hydrationBailed
6392                ) {
6393                  hydrationBailed = true;
6394                  console.warn('Parent: ', elm);
6395                  console.warn('server innerHTML: ', i);
6396                  console.warn('client innerHTML: ', elm.innerHTML);
6397                }
6398                return false
6399              }
6400            } else {
6401              // iterate and compare children lists
6402              var childrenMatch = true;
6403              var childNode = elm.firstChild;
6404              for (var i$1 = 0; i$1 < children.length; i$1++) {
6405                if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
6406                  childrenMatch = false;
6407                  break
6408                }
6409                childNode = childNode.nextSibling;
6410              }
6411              // if childNode is not null, it means the actual childNodes list is
6412              // longer than the virtual children list.
6413              if (!childrenMatch || childNode) {
6414                /* istanbul ignore if */
6415                if (typeof console !== 'undefined' &&
6416                  !hydrationBailed
6417                ) {
6418                  hydrationBailed = true;
6419                  console.warn('Parent: ', elm);
6420                  console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
6421                }
6422                return false
6423              }
6424            }
6425          }
6426        }
6427        if (isDef(data)) {
6428          var fullInvoke = false;
6429          for (var key in data) {
6430            if (!isRenderedModule(key)) {
6431              fullInvoke = true;
6432              invokeCreateHooks(vnode, insertedVnodeQueue);
6433              break
6434            }
6435          }
6436          if (!fullInvoke && data['class']) {
6437            // ensure collecting deps for deep class bindings for future updates
6438            traverse(data['class']);
6439          }
6440        }
6441      } else if (elm.data !== vnode.text) {
6442        elm.data = vnode.text;
6443      }
6444      return true
6445    }
6446
6447    function assertNodeMatch (node, vnode, inVPre) {

6448      if (isDef(vnode.tag)) {
6449        return vnode.tag.indexOf('vue-component') === 0 || (
6450          !isUnknownElement$$1(vnode, inVPre) &&
6451          vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
6452        )
6453      } else {
6454        return node.nodeType === (vnode.isComment ? 8 : 3)
6455      }
6456    }
6457
6458    return function patch (oldVnode, vnode, hydrating, removeOnly) {
6459      if (isUndef(vnode)) {
6460        if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
6461        return
6462      }
6463
6464      var isInitialPatch = false;
6465      var insertedVnodeQueue = [];
6466
6467      if (isUndef(oldVnode)) {
6468        // empty mount (likely as component), create new root element
6469        isInitialPatch = true;
6470        createElm(vnode, insertedVnodeQueue);
6471      } else {
6472        var isRealElement = isDef(oldVnode.nodeType);
6473        if (!isRealElement && sameVnode(oldVnode, vnode)) {
6474          // patch existing root node
6475          patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);
6476        } else {
6477          if (isRealElement) {
6478            // mounting to a real element
6479            // check if this is server-rendered content and if we can perform
6480            // a successful hydration.
6481            if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
6482              oldVnode.removeAttribute(SSR_ATTR);
6483              hydrating = true;
6484            }
6485            if (isTrue(hydrating)) {
6486              if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
6487                invokeInsertHook(vnode, insertedVnodeQueue, true);
6488                return oldVnode
6489              } else {
6490                warn(
6491                  'The client-side rendered virtual DOM tree is not matching ' +
6492                  'server-rendered content. This is likely caused by incorrect ' +
6493                  'HTML markup, for example nesting block-level elements inside ' +
6494                  '<p>, or missing <tbody>. Bailing hydration and performing ' +
6495                  'full client-side render.'
6496                );
6497              }
6498            }
6499            // either not server-rendered, or hydration failed.
6500            // create an empty node and replace it
6501            oldVnode = emptyNodeAt(oldVnode);
6502          }
6503
6504          // replacing existing element
6505          var oldElm = oldVnode.elm;
6506          var parentElm = nodeOps.parentNode(oldElm);
6507
6508          // create new node
6509          createElm(
6510            vnode,
6511            insertedVnodeQueue,
6512            // extremely rare edge case: do not insert if old element is in a
6513            // leaving transition. Only happens when combining transition +
6514            // keep-alive + HOCs. (#4590)
6515            oldElm._leaveCb ? null : parentElm,
6516            nodeOps.nextSibling(oldElm)
6517          );
6518
6519          // update parent placeholder node element, recursively

6520          if (isDef(vnode.parent)) {
6521            var ancestor = vnode.parent;
6522            var patchable = isPatchable(vnode);
6523            while (ancestor) {
6524              for (var i = 0; i < cbs.destroy.length; ++i) {
6525                cbs.destroy[i](ancestor);
6526              }
6527              ancestor.elm = vnode.elm;
6528              if (patchable) {
6529                for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
6530                  cbs.create[i$1](emptyNode, ancestor);
6531                }
6532                // #6513
6533                // invoke insert hooks that may have been merged by create hooks.
6534                // e.g. for directives that uses the "inserted" hook.
6535                var insert = ancestor.data.hook.insert;
6536                if (insert.merged) {
6537                  // start at index 1 to avoid re-invoking component mounted hook
6538                  for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
6539                    insert.fns[i$2]();
6540                  }
6541                }
6542              } else {
6543                registerRef(ancestor);
6544              }
6545              ancestor = ancestor.parent;
6546            }
6547          }
6548
6549          // destroy old node
6550          if (isDef(parentElm)) {
6551            removeVnodes([oldVnode], 0, 0);
6552          } else if (isDef(oldVnode.tag)) {
6553            invokeDestroyHook(oldVnode);
6554          }
6555        }
6556      }
6557
6558      invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
6559      return vnode.elm
6560    }
6561  }
6562
6563  /*  */
6564
6565  var directives = {
6566    create: updateDirectives,
6567    update: updateDirectives,
6568    destroy: function unbindDirectives (vnode) {
6569      updateDirectives(vnode, emptyNode);
6570    }
6571  };
6572
6573  function updateDirectives (oldVnode, vnode) {
6574    if (oldVnode.data.directives || vnode.data.directives) {
6575      _update(oldVnode, vnode);
6576    }
6577  }
6578
6579  function _update (oldVnode, vnode) {
6580    var isCreate = oldVnode === emptyNode;
6581    var isDestroy = vnode === emptyNode;
6582    var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
6583    var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);
6584
6585    var dirsWithInsert = [];
6586    var dirsWithPostpatch = [];
6587
6588    var key, oldDir, dir;
6589    for (key in newDirs) {
6590      oldDir = oldDirs[key];
6591      dir = newDirs[key];
6592      if (!oldDir) {
6593        // new directive, bind
6594        callHook$1(dir, 'bind', vnode, oldVnode);
6595        if (dir.def && dir.def.inserted) {
6596          dirsWithInsert.push(dir);
6597        }
6598      } else {
6599        // existing directive, update
6600        dir.oldValue = oldDir.value;
6601        dir.oldArg = oldDir.arg;
6602        callHook$1(dir, 'update', vnode, oldVnode);
6603        if (dir.def && dir.def.componentUpdated) {
6604          dirsWithPostpatch.push(dir);
6605        }
6606      }
6607    }
6608
6609    if (dirsWithInsert.length) {
6610      var callInsert = function () {
6611        for (var i = 0; i < dirsWithInsert.length; i++) {
6612          callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
6613        }
6614      };
6615      if (isCreate) {
6616        mergeVNodeHook(vnode, 'insert', callInsert);
6617      } else {
6618        callInsert();
6619      }
6620    }
6621
6622    if (dirsWithPostpatch.length) {
6623      mergeVNodeHook(vnode, 'postpatch', function () {
6624        for (var i = 0; i < dirsWithPostpatch.length; i++) {
6625          callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
6626        }
6627      });
6628    }
6629
6630    if (!isCreate) {
6631      for (key in oldDirs) {
6632        if (!newDirs[key]) {
6633          // no longer present, unbind
6634          callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
6635        }
6636      }
6637    }
6638  }
6639
6640  var emptyModifiers = Object.create(null);
6641
6642  function normalizeDirectives$1 (
6643    dirs,
6644    vm
6645  ) {
6646    var res = Object.create(null);
6647    if (!dirs) {
6648      // $flow-disable-line
6649      return res
6650    }
6651    var i, dir;
6652    for (i = 0; i < dirs.length; i++) {
6653      dir = dirs[i];
6654      if (!dir.modifiers) {
6655        // $flow-disable-line
6656        dir.modifiers = emptyModifiers;
6657      }
6658      res[getRawDirName(dir)] = dir;
6659      dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
6660    }
6661    // $flow-disable-line
6662    return res
6663  }
6664
6665  function getRawDirName (dir) {
6666    return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
6667  }
6668
6669  function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
6670    var fn = dir.def && dir.def[hook];
6671    if (fn) {

6672      try {
6673        fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
6674      } catch (e) {
6675        handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
6676      }
6677    }
6678  }
6679
6680  var baseModules = [
6681    ref,
6682    directives
6683  ];
6684
6685  /*  */
6686
6687  function updateAttrs (oldVnode, vnode) {
6688    var opts = vnode.componentOptions;
6689    if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
6690      return
6691    }
6692    if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
6693      return
6694    }
6695    var key, cur, old;
6696    var elm = vnode.elm;
6697    var oldAttrs = oldVnode.data.attrs || {};
6698    var attrs = vnode.data.attrs || {};
6699    // clone observed objects, as the user probably wants to mutate it
6700    if (isDef(attrs.__ob__)) {
6701      attrs = vnode.data.attrs = extend({}, attrs);
6702    }
6703
6704    for (key in attrs) {
6705      cur = attrs[key];
6706      old = oldAttrs[key];
6707      if (old !== cur) {
6708        setAttr(elm, key, cur);
6709      }
6710    }
6711    // #4391: in IE9, setting type can reset value for input[type=radio]
6712    // #6666: IE/Edge forces progress value down to 1 before setting a max
6713    /* istanbul ignore if */
6714    if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
6715      setAttr(elm, 'value', attrs.value);
6716    }
6717    for (key in oldAttrs) {
6718      if (isUndef(attrs[key])) {
6719        if (isXlink(key)) {
6720          elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
6721        } else if (!isEnumeratedAttr(key)) {
6722          elm.removeAttribute(key);
6723        }
6724      }
6725    }
6726  }
6727
6728  function setAttr (el, key, value) {
6729    if (el.tagName.indexOf('-') > -1) {
6730      baseSetAttr(el, key, value);
6731    } else if (isBooleanAttr(key)) {
6732      // set attribute for blank value
6733      // e.g. <option disabled>Select one</option>
6734      if (isFalsyAttrValue(value)) {
6735        el.removeAttribute(key);
6736      } else {
6737        // technically allowfullscreen is a boolean attribute for <iframe>,
6738        // but Flash expects a value of "true" when used on <embed> tag
6739        value = key === 'allowfullscreen' && el.tagName === 'EMBED'
6740          ? 'true'
6741          : key;
6742        el.setAttribute(key, value);
6743      }
6744    } else if (isEnumeratedAttr(key)) {
6745      el.setAttribute(key, convertEnumeratedValue(key, value));
6746    } else if (isXlink(key)) {
6747      if (isFalsyAttrValue(value)) {
6748        el.removeAttributeNS(xlinkNS, getXlinkProp(key));
6749      } else {
6750        el.setAttributeNS(xlinkNS, key, value);
6751      }
6752    } else {
6753      baseSetAttr(el, key, value);
6754    }
6755  }
6756
6757  function baseSetAttr (el, key, value) {
6758    if (isFalsyAttrValue(value)) {
6759      el.removeAttribute(key);
6760    } else {
6761      // #7138: IE10 & 11 fires input event when setting placeholder on
6762      // <textarea>... block the first input event and remove the blocker
6763      // immediately.
6764      /* istanbul ignore if */
6765      if (
6766        isIE && !isIE9 &&
6767        el.tagName === 'TEXTAREA' &&
6768        key === 'placeholder' && value !== '' && !el.__ieph
6769      ) {
6770        var blocker = function (e) {
6771          e.stopImmediatePropagation();
6772          el.removeEventListener('input', blocker);
6773        };
6774        el.addEventListener('input', blocker);
6775        // $flow-disable-line
6776        el.__ieph = true; /* IE placeholder patched */
6777      }
6778      el.setAttribute(key, value);
6779    }
6780  }
6781
6782  var attrs = {
6783    create: updateAttrs,
6784    update: updateAttrs
6785  };
6786
6787  /*  */
6788
6789  function updateClass (oldVnode, vnode) {
6790    var el = vnode.elm;
6791    var data = vnode.data;
6792    var oldData = oldVnode.data;
6793    if (
6794      isUndef(data.staticClass) &&
6795      isUndef(data.class) && (
6796        isUndef(oldData) || (
6797          isUndef(oldData.staticClass) &&
6798          isUndef(oldData.class)
6799        )
6800      )
6801    ) {
6802      return
6803    }
6804
6805    var cls = genClassForVnode(vnode);
6806
6807    // handle transition classes
6808    var transitionClass = el._transitionClasses;
6809    if (isDef(transitionClass)) {
6810      cls = concat(cls, stringifyClass(transitionClass));
6811    }
6812
6813    // set the class
6814    if (cls !== el._prevClass) {
6815      el.setAttribute('class', cls);
6816      el._prevClass = cls;
6817    }
6818  }
6819
6820  var klass = {
6821    create: updateClass,
6822    update: updateClass
6823  };
6824
6825  /*  */
6826

6827  var validDivisionCharRE = /[\w).+\-_$\]]/;
6828
6829  function parseFilters (exp) {
6830    var inSingle = false;
6831    var inDouble = false;
6832    var inTemplateString = false;
6833    var inRegex = false;
6834    var curly = 0;
6835    var square = 0;
6836    var paren = 0;
6837    var lastFilterIndex = 0;
6838    var c, prev, i, expression, filters;
6839
6840    for (i = 0; i < exp.length; i++) {
6841      prev = c;
6842      c = exp.charCodeAt(i);
6843      if (inSingle) {
6844        if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
6845      } else if (inDouble) {
6846        if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
6847      } else if (inTemplateString) {
6848        if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
6849      } else if (inRegex) {
6850        if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
6851      } else if (
6852        c === 0x7C && // pipe
6853        exp.charCodeAt(i + 1) !== 0x7C &&
6854        exp.charCodeAt(i - 1) !== 0x7C &&
6855        !curly && !square && !paren
6856      ) {
6857        if (expression === undefined) {
6858          // first filter, end of expression
6859          lastFilterIndex = i + 1;
6860          expression = exp.slice(0, i).trim();
6861        } else {
6862          pushFilter();
6863        }
6864      } else {
6865        switch (c) {
6866          case 0x22: inDouble = true; break         // "
6867          case 0x27: inSingle = true; break         // '
6868          case 0x60: inTemplateString = true; break // `
6869          case 0x28: paren++; break                 // (
6870          case 0x29: paren--; break                 // )
6871          case 0x5B: square++; break                // [
6872          case 0x5D: square--; break                // ]
6873          case 0x7B: curly++; break                 // {
6874          case 0x7D: curly--; break                 // }
6875        }
6876        if (c === 0x2f) { // /
6877          var j = i - 1;
6878          var p = (void 0);
6879          // find first non-whitespace prev char
6880          for (; j >= 0; j--) {
6881            p = exp.charAt(j);
6882            if (p !== ' ') { break }
6883          }
6884          if (!p || !validDivisionCharRE.test(p)) {
6885            inRegex = true;
6886          }
6887        }
6888      }
6889    }
6890
6891    if (expression === undefined) {
6892      expression = exp.slice(0, i).trim();
6893    } else if (lastFilterIndex !== 0) {
6894      pushFilter();
6895    }
6896
6897    function pushFilter () {
6898      (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
6899      lastFilterIndex = i + 1;
6900    }
6901
6902    if (filters) {
6903      for (i = 0; i < filters.length; i++) {
6904        expression = wrapFilter(expression, filters[i]);
6905      }
6906    }
6907
6908    return expression
6909  }
6910
6911  function wrapFilter (exp, filter) {
6912    var i = filter.indexOf('(');
6913    if (i < 0) {
6914      // _f: resolveFilter
6915      return ("_f(\"" + filter + "\")(" + exp + ")")
6916    } else {
6917      var name = filter.slice(0, i);
6918      var args = filter.slice(i + 1);
6919      return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
6920    }
6921  }
6922
6923  /*  */
6924
6925
6926
6927  /* eslint-disable no-unused-vars */
6928  function baseWarn (msg, range) {
6929    console.error(("[Vue compiler]: " + msg));
6930  }
6931  /* eslint-enable no-unused-vars */
6932
6933  function pluckModuleFunction (
6934    modules,
6935    key
6936  ) {
6937    return modules
6938      ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
6939      : []
6940  }
6941
6942  function addProp (el, name, value, range, dynamic) {
6943    (el.props || (el.props = [])).push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
6944    el.plain = false;
6945  }
6946
6947  function addAttr (el, name, value, range, dynamic) {
6948    var attrs = dynamic
6949      ? (el.dynamicAttrs || (el.dynamicAttrs = []))
6950      : (el.attrs || (el.attrs = []));
6951    attrs.push(rangeSetItem({ name: name, value: value, dynamic: dynamic }, range));
6952    el.plain = false;
6953  }
6954
6955  // add a raw attr (use this in preTransforms)
6956  function addRawAttr (el, name, value, range) {
6957    el.attrsMap[name] = value;
6958    el.attrsList.push(rangeSetItem({ name: name, value: value }, range));
6959  }
6960
6961  function addDirective (
6962    el,
6963    name,
6964    rawName,
6965    value,
6966    arg,
6967    isDynamicArg,
6968    modifiers,
6969    range
6970  ) {
6971    (el.directives || (el.directives = [])).push(rangeSetItem({
6972      name: name,
6973      rawName: rawName,
6974      value: value,
6975      arg: arg,
6976      isDynamicArg: isDynamicArg,
6977      modifiers: modifiers
6978    }, range));
6979    el.plain = false;
6980  }
6981
6982  function prependModifierMarker (symbol, name, dynamic) {
6983    return dynamic
6984      ? ("_p(" + name + ",\"" + symbol + "\")")
6985      : symbol + name // mark the event as captured
6986  }
6987
6988  function addHandler (
6989    el,
6990    name,
6991    value,
6992    modifiers,
6993    important,
6994    warn,
6995    range,
6996    dynamic
6997  ) {
6998    modifiers = modifiers || emptyObject;
6999    // warn prevent and passive modifier
7000    /* istanbul ignore if */
7001    if (
7002      warn &&
7003      modifiers.prevent && modifiers.passive
7004    ) {
7005      warn(
7006        'passive and prevent can\'t be used together. ' +
7007        'Passive handler can\'t prevent default event.',
7008        range
7009      );
7010    }
7011
7012    // normalize click.right and click.middle since they don't actually fire
7013    // this is technically browser-specific, but at least for now browsers are
7014    // the only target envs that have right/middle clicks.
7015    if (modifiers.right) {
7016      if (dynamic) {
7017        name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
7018      } else if (name === 'click') {
7019        name = 'contextmenu';
7020        delete modifiers.right;
7021      }
7022    } else if (modifiers.middle) {
7023      if (dynamic) {
7024        name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
7025      } else if (name === 'click') {
7026        name = 'mouseup';
7027      }
7028    }
7029
7030    // check capture modifier
7031    if (modifiers.capture) {
7032      delete modifiers.capture;
7033      name = prependModifierMarker('!', name, dynamic);
7034    }
7035    if (modifiers.once) {
7036      delete modifiers.once;
7037      name = prependModifierMarker('~', name, dynamic);
7038    }
7039    /* istanbul ignore if */
7040    if (modifiers.passive) {
7041      delete modifiers.passive;
7042      name = prependModifierMarker('&', name, dynamic);
7043    }
7044
7045    var events;
7046    if (modifiers.native) {
7047      delete modifiers.native;
7048      events = el.nativeEvents || (el.nativeEvents = {});
7049    } else {
7050      events = el.events || (el.events = {});
7051    }
7052
7053    var newHandler = rangeSetItem({ value: value.trim(), dynamic: dynamic }, range);
7054    if (modifiers !== emptyObject) {
7055      newHandler.modifiers = modifiers;
7056    }
7057
7058    var handlers = events[name];
7059    /* istanbul ignore if */
7060    if (Array.isArray(handlers)) {
7061      important ? handlers.unshift(newHandler) : handlers.push(newHandler);
7062    } else if (handlers) {
7063      events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
7064    } else {
7065      events[name] = newHandler;
7066    }
7067
7068    el.plain = false;
7069  }
7070
7071  function getRawBindingAttr (
7072    el,
7073    name
7074  ) {
7075    return el.rawAttrsMap[':' + name] ||
7076      el.rawAttrsMap['v-bind:' + name] ||
7077      el.rawAttrsMap[name]
7078  }
7079
7080  function getBindingAttr (
7081    el,
7082    name,
7083    getStatic
7084  ) {
7085    var dynamicValue =
7086      getAndRemoveAttr(el, ':' + name) ||
7087      getAndRemoveAttr(el, 'v-bind:' + name);
7088    if (dynamicValue != null) {
7089      return parseFilters(dynamicValue)
7090    } else if (getStatic !== false) {
7091      var staticValue = getAndRemoveAttr(el, name);
7092      if (staticValue != null) {
7093        return JSON.stringify(staticValue)
7094      }
7095    }
7096  }
7097
7098  // note: this only removes the attr from the Array (attrsList) so that it
7099  // doesn't get processed by processAttrs.
7100  // By default it does NOT remove it from the map (attrsMap) because the map is
7101  // needed during codegen.
7102  function getAndRemoveAttr (
7103    el,
7104    name,
7105    removeFromMap
7106  ) {
7107    var val;
7108    if ((val = el.attrsMap[name]) != null) {
7109      var list = el.attrsList;
7110      for (var i = 0, l = list.length; i < l; i++) {
7111        if (list[i].name === name) {
7112          list.splice(i, 1);
7113          break
7114        }
7115      }
7116    }
7117    if (removeFromMap) {
7118      delete el.attrsMap[name];
7119    }
7120    return val
7121  }
7122
7123  function getAndRemoveAttrByRegex (
7124    el,
7125    name
7126  ) {
7127    var list = el.attrsList;
7128    for (var i = 0, l = list.length; i < l; i++) {
7129      var attr = list[i];
7130      if (name.test(attr.name)) {
7131        list.splice(i, 1);
7132        return attr
7133      }
7134    }
7135  }
7136
7137  function rangeSetItem (
7138    item,
7139    range
7140  ) {
7141    if (range) {
7142      if (range.start != null) {
7143        item.start = range.start;
7144      }
7145      if (range.end != null) {
7146        item.end = range.end;
7147      }
7148    }
7149    return item
7150  }
7151
7152  /*  */
7153
7154  /**
7155   * Cross-platform code generation for component v-model
7156   */
7157  function genComponentModel (
7158    el,
7159    value,
7160    modifiers
7161  ) {
7162    var ref = modifiers || {};
7163    var number = ref.number;
7164    var trim = ref.trim;
7165
7166    var baseValueExpression = '$$v';
7167    var valueExpression = baseValueExpression;
7168    if (trim) {
7169      valueExpression =
7170        "(typeof " + baseValueExpression + " === 'string'" +
7171        "? " + baseValueExpression + ".trim()" +
7172        ": " + baseValueExpression + ")";
7173    }
7174    if (number) {
7175      valueExpression = "_n(" + valueExpression + ")";
7176    }

7177    var assignment = genAssignmentCode(value, valueExpression);
7178
7179    el.model = {
7180      value: ("(" + value + ")"),
7181      expression: JSON.stringify(value),
7182      callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
7183    };
7184  }
7185
7186  /**
7187   * Cross-platform codegen helper for generating v-model value assignment code.
7188   */
7189  function genAssignmentCode (
7190    value,
7191    assignment
7192  ) {
7193    var res = parseModel(value);
7194    if (res.key === null) {
7195      return (value + "=" + assignment)
7196    } else {
7197      return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
7198    }
7199  }
7200
7201  /**
7202   * Parse a v-model expression into a base path and a final key segment.
7203   * Handles both dot-path and possible square brackets.
7204   *
7205   * Possible cases:
7206   *
7207   * - test
7208   * - test[key]
7209   * - test[test1[key]]
7210   * - test["a"][key]
7211   * - xxx.test[a[a].test1[key]]
7212   * - test.xxx.a["asa"][test1[key]]
7213   *
7214   */
7215
7216  var len, str, chr, index$1, expressionPos, expressionEndPos;
7217
7218
7219
7220  function parseModel (val) {
7221    // Fix https://github.com/vuejs/vue/pull/7730
7222    // allow v-model="obj.val " (trailing whitespace)
7223    val = val.trim();
7224    len = val.length;
7225
7226    if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
7227      index$1 = val.lastIndexOf('.');
7228      if (index$1 > -1) {
7229        return {
7230          exp: val.slice(0, index$1),
7231          key: '"' + val.slice(index$1 + 1) + '"'
7232        }
7233      } else {
7234        return {
7235          exp: val,
7236          key: null
7237        }
7238      }
7239    }
7240
7241    str = val;
7242    index$1 = expressionPos = expressionEndPos = 0;
7243
7244    while (!eof()) {
7245      chr = next();
7246      /* istanbul ignore if */
7247      if (isStringStart(chr)) {
7248        parseString(chr);
7249      } else if (chr === 0x5B) {
7250        parseBracket(chr);
7251      }
7252    }
7253
7254    return {
7255      exp: val.slice(0, expressionPos),
7256      key: val.slice(expressionPos + 1, expressionEndPos)
7257    }
7258  }
7259
7260  function next () {
7261    return str.charCodeAt(++index$1)
7262  }
7263
7264  function eof () {
7265    return index$1 >= len
7266  }
7267
7268  function isStringStart (chr) {
7269    return chr === 0x22 || chr === 0x27
7270  }
7271
7272  function parseBracket (chr) {
7273    var inBracket = 1;
7274    expressionPos = index$1;
7275    while (!eof()) {
7276      chr = next();
7277      if (isStringStart(chr)) {
7278        parseString(chr);
7279        continue
7280      }
7281      if (chr === 0x5B) { inBracket++; }
7282      if (chr === 0x5D) { inBracket--; }
7283      if (inBracket === 0) {
7284        expressionEndPos = index$1;
7285        break
7286      }
7287    }
7288  }
7289
7290  function parseString (chr) {
7291    var stringQuote = chr;
7292    while (!eof()) {
7293      chr = next();
7294      if (chr === stringQuote) {
7295        break
7296      }
7297    }
7298  }
7299
7300  /*  */
7301
7302  var warn$1;
7303
7304  // in some cases, the event used has to be determined at runtime
7305  // so we used some reserved tokens during compile.
7306  var RANGE_TOKEN = '__r';
7307  var CHECKBOX_RADIO_TOKEN = '__c';
7308
7309  function model (
7310    el,
7311    dir,
7312    _warn
7313  ) {
7314    warn$1 = _warn;
7315    var value = dir.value;
7316    var modifiers = dir.modifiers;
7317    var tag = el.tag;
7318    var type = el.attrsMap.type;
7319
7320    {
7321      // inputs with type="file" are read only and setting the input's
7322      // value will throw an error.
7323      if (tag === 'input' && type === 'file') {
7324        warn$1(
7325          "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
7326          "File inputs are read only. Use a v-on:change listener instead.",
7327          el.rawAttrsMap['v-model']
7328        );
7329      }
7330    }
7331
7332    if (el.component) {
7333      genComponentModel(el, value, modifiers);
7334      // component v-model doesn't need extra runtime
7335      return false
7336    } else if (tag === 'select') {
7337      genSelect(el, value, modifiers);
7338    } else if (tag === 'input' && type === 'checkbox') {
7339      genCheckboxModel(el, value, modifiers);
7340    } else if (tag === 'input' && type === 'radio') {
7341      genRadioModel(el, value, modifiers);
7342    } else if (tag === 'input' || tag === 'textarea') {
7343      genDefaultModel(el, value, modifiers);
7344    } else if (!config.isReservedTag(tag)) {
7345      genComponentModel(el, value, modifiers);
7346      // component v-model doesn't need extra runtime
7347      return false
7348    } else {
7349      warn$1(
7350        "<" + (el.tag) + " v-model=\"" + value + "\">: " +
7351        "v-model is not supported on this element type. " +
7352        'If you are working with contenteditable, it\'s recommended to ' +
7353        'wrap a library dedicated for that purpose inside a custom component.',
7354        el.rawAttrsMap['v-model']
7355      );
7356    }
7357
7358    // ensure runtime directive metadata
7359    return true
7360  }
7361

7362  function genCheckboxModel (
7363    el,
7364    value,
7365    modifiers
7366  ) {
7367    var number = modifiers && modifiers.number;
7368    var valueBinding = getBindingAttr(el, 'value') || 'null';
7369    var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
7370    var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
7371    addProp(el, 'checked',
7372      "Array.isArray(" + value + ")" +
7373      "?_i(" + value + "," + valueBinding + ")>-1" + (
7374        trueValueBinding === 'true'
7375          ? (":(" + value + ")")
7376          : (":_q(" + value + "," + trueValueBinding + ")")
7377      )
7378    );
7379    addHandler(el, 'change',
7380      "var $$a=" + value + "," +
7381          '$$el=$event.target,' +
7382          "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
7383      'if(Array.isArray($$a)){' +
7384        "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
7385            '$$i=_i($$a,$$v);' +
7386        "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
7387        "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
7388      "}else{" + (genAssignmentCode(value, '$$c')) + "}",
7389      null, true
7390    );
7391  }
7392
7393  function genRadioModel (
7394    el,
7395    value,
7396    modifiers
7397  ) {
7398    var number = modifiers && modifiers.number;
7399    var valueBinding = getBindingAttr(el, 'value') || 'null';
7400    valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
7401    addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
7402    addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
7403  }
7404
7405  function genSelect (
7406    el,
7407    value,
7408    modifiers
7409  ) {
7410    var number = modifiers && modifiers.number;
7411    var selectedVal = "Array.prototype.filter" +
7412      ".call($event.target.options,function(o){return o.selected})" +
7413      ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
7414      "return " + (number ? '_n(val)' : 'val') + "})";
7415
7416    var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
7417    var code = "var $$selectedVal = " + selectedVal + ";";
7418    code = code + " " + (genAssignmentCode(value, assignment));
7419    addHandler(el, 'change', code, null, true);
7420  }
7421
7422  function genDefaultModel (
7423    el,
7424    value,
7425    modifiers
7426  ) {
7427    var type = el.attrsMap.type;
7428
7429    // warn if v-bind:value conflicts with v-model
7430    // except for inputs with v-bind:type
7431    {
7432      var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
7433      var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
7434      if (value$1 && !typeBinding) {
7435        var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
7436        warn$1(
7437          binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
7438          'because the latter already expands to a value binding internally',
7439          el.rawAttrsMap[binding]
7440        );
7441      }
7442    }
7443
7444    var ref = modifiers || {};
7445    var lazy = ref.lazy;
7446    var number = ref.number;
7447    var trim = ref.trim;
7448    var needCompositionGuard = !lazy && type !== 'range';
7449    var event = lazy
7450      ? 'change'
7451      : type === 'range'
7452        ? RANGE_TOKEN
7453        : 'input';
7454
7455    var valueExpression = '$event.target.value';
7456    if (trim) {
7457      valueExpression = "$event.target.value.trim()";
7458    }
7459    if (number) {
7460      valueExpression = "_n(" + valueExpression + ")";
7461    }
7462
7463    var code = genAssignmentCode(value, valueExpression);
7464    if (needCompositionGuard) {
7465      code = "if($event.target.composing)return;" + code;
7466    }
7467
7468    addProp(el, 'value', ("(" + value + ")"));
7469    addHandler(el, event, code, null, true);
7470    if (trim || number) {
7471      addHandler(el, 'blur', '$forceUpdate()');
7472    }
7473  }
7474
7475  /*  */
7476
7477  // normalize v-model event tokens that can only be determined at runtime.
7478  // it's important to place the event as the first in the array because
7479  // the whole point is ensuring the v-model callback gets called before
7480  // user-attached handlers.
7481  function normalizeEvents (on) {
7482    /* istanbul ignore if */
7483    if (isDef(on[RANGE_TOKEN])) {
7484      // IE input[type=range] only supports `change` event
7485      var event = isIE ? 'change' : 'input';
7486      on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
7487      delete on[RANGE_TOKEN];
7488    }
7489    // This was originally intended to fix #4521 but no longer necessary
7490    // after 2.5. Keeping it for backwards compat with generated code from < 2.4
7491    /* istanbul ignore if */
7492    if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
7493      on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
7494      delete on[CHECKBOX_RADIO_TOKEN];
7495    }
7496  }
7497
7498  var target$1;
7499
7500  function createOnceHandler$1 (event, handler, capture) {
7501    var _target = target$1; // save current target element in closure
7502    return function onceHandler () {
7503      var res = handler.apply(null, arguments);
7504      if (res !== null) {
7505        remove$2(event, onceHandler, capture, _target);
7506      }
7507    }
7508  }
7509
7510  // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
7511  // implementation and does not fire microtasks in between event propagation, so
7512  // safe to exclude.
7513  var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
7514
7515  function add$1 (
7516    name,
7517    handler,
7518    capture,
7519    passive
7520  ) {

7521    // async edge case #6566: inner click event triggers patch, event handler
7522    // attached to outer element during patch, and triggered again. This
7523    // happens because browsers fire microtask ticks between event propagation.
7524    // the solution is simple: we save the timestamp when a handler is attached,
7525    // and the handler would only fire if the event passed to it was fired
7526    // AFTER it was attached.
7527    if (useMicrotaskFix) {
7528      var attachedTimestamp = currentFlushTimestamp;
7529      var original = handler;
7530      handler = original._wrapper = function (e) {
7531        if (
7532          // no bubbling, should always fire.
7533          // this is just a safety net in case event.timeStamp is unreliable in
7534          // certain weird environments...
7535          e.target === e.currentTarget ||
7536          // event is fired after handler attachment
7537          e.timeStamp >= attachedTimestamp ||
7538          // bail for environments that have buggy event.timeStamp implementations
7539          // #9462 iOS 9 bug: event.timeStamp is 0 after history.pushState
7540          // #9681 QtWebEngine event.timeStamp is negative value
7541          e.timeStamp <= 0 ||
7542          // #9448 bail if event is fired in another document in a multi-page
7543          // electron/nw.js app, since event.timeStamp will be using a different
7544          // starting reference
7545          e.target.ownerDocument !== document
7546        ) {
7547          return original.apply(this, arguments)
7548        }
7549      };
7550    }
7551    target$1.addEventListener(
7552      name,
7553      handler,
7554      supportsPassive
7555        ? { capture: capture, passive: passive }
7556        : capture
7557    );
7558  }
7559
7560  function remove$2 (
7561    name,
7562    handler,
7563    capture,
7564    _target
7565  ) {
7566    (_target || target$1).removeEventListener(
7567      name,
7568      handler._wrapper || handler,
7569      capture
7570    );
7571  }
7572
7573  function updateDOMListeners (oldVnode, vnode) {
7574    if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
7575      return
7576    }
7577    var on = vnode.data.on || {};
7578    var oldOn = oldVnode.data.on || {};
7579    target$1 = vnode.elm;
7580    normalizeEvents(on);
7581    updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);
7582    target$1 = undefined;
7583  }
7584
7585  var events = {
7586    create: updateDOMListeners,
7587    update: updateDOMListeners
7588  };
7589
7590  /*  */
7591
7592  var svgContainer;
7593
7594  function updateDOMProps (oldVnode, vnode) {
7595    if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
7596      return
7597    }
7598    var key, cur;
7599    var elm = vnode.elm;
7600    var oldProps = oldVnode.data.domProps || {};
7601    var props = vnode.data.domProps || {};
7602    // clone observed objects, as the user probably wants to mutate it
7603    if (isDef(props.__ob__)) {
7604      props = vnode.data.domProps = extend({}, props);
7605    }
7606
7607    for (key in oldProps) {
7608      if (!(key in props)) {
7609        elm[key] = '';
7610      }
7611    }
7612
7613    for (key in props) {
7614      cur = props[key];
7615      // ignore children if the node has textContent or innerHTML,
7616      // as these will throw away existing DOM nodes and cause removal errors
7617      // on subsequent patches (#3360)
7618      if (key === 'textContent' || key === 'innerHTML') {
7619        if (vnode.children) { vnode.children.length = 0; }
7620        if (cur === oldProps[key]) { continue }
7621        // #6601 work around Chrome version <= 55 bug where single textNode
7622        // replaced by innerHTML/textContent retains its parentNode property
7623        if (elm.childNodes.length === 1) {
7624          elm.removeChild(elm.childNodes[0]);
7625        }
7626      }
7627
7628      if (key === 'value' && elm.tagName !== 'PROGRESS') {
7629        // store value as _value as well since
7630        // non-string values will be stringified
7631        elm._value = cur;
7632        // avoid resetting cursor position when value is the same
7633        var strCur = isUndef(cur) ? '' : String(cur);
7634        if (shouldUpdateValue(elm, strCur)) {
7635          elm.value = strCur;
7636        }
7637      } else if (key === 'innerHTML' && isSVG(elm.tagName) && isUndef(elm.innerHTML)) {
7638        // IE doesn't support innerHTML for SVG elements
7639        svgContainer = svgContainer || document.createElement('div');
7640        svgContainer.innerHTML = "<svg>" + cur + "</svg>";
7641        var svg = svgContainer.firstChild;
7642        while (elm.firstChild) {
7643          elm.removeChild(elm.firstChild);
7644        }
7645        while (svg.firstChild) {
7646          elm.appendChild(svg.firstChild);
7647        }
7648      } else if (
7649        // skip the update if old and new VDOM state is the same.
7650        // `value` is handled separately because the DOM value may be temporarily
7651        // out of sync with VDOM state due to focus, composition and modifiers.
7652        // This  #4521 by skipping the unnecesarry `checked` update.
7653        cur !== oldProps[key]
7654      ) {
7655        // some property updates can throw
7656        // e.g. `value` on <progress> w/ non-finite value
7657        try {
7658          elm[key] = cur;
7659        } catch (e) {}
7660      }
7661    }
7662  }
7663
7664  // check platforms/web/util/attrs.js acceptValue
7665
7666
7667  function shouldUpdateValue (elm, checkVal) {
7668    return (!elm.composing && (
7669      elm.tagName === 'OPTION' ||
7670      isNotInFocusAndDirty(elm, checkVal) ||
7671      isDirtyWithModifiers(elm, checkVal)
7672    ))
7673  }
7674
7675  function isNotInFocusAndDirty (elm, checkVal) {
7676    // return true when textbox (.number and .trim) loses focus and its value is
7677    // not equal to the updated value
7678    var notInFocus = true;
7679    // #6157
7680    // work around IE bug when accessing document.activeElement in an iframe
7681    try { notInFocus = document.activeElement !== elm; } catch (e) {}
7682    return notInFocus && elm.value !== checkVal
7683  }
7684
7685  function isDirtyWithModifiers (elm, newVal) {
7686    var value = elm.value;
7687    var modifiers = elm._vModifiers; // injected by v-model runtime
7688    if (isDef(modifiers)) {
7689      if (modifiers.number) {
7690        return toNumber(value) !== toNumber(newVal)
7691      }
7692      if (modifiers.trim) {
7693        return value.trim() !== newVal.trim()
7694      }
7695    }
7696    return value !== newVal
7697  }
7698
7699  var domProps = {
7700    create: updateDOMProps,
7701    update: updateDOMProps
7702  };
7703
7704  /*  */
7705
7706  var parseStyleText = cached(function (cssText) {
7707    var res = {};
7708    var listDelimiter = /;(?![^(]*\))/g;
7709    var propertyDelimiter = /:(.+)/;
7710    cssText.split(listDelimiter).forEach(function (item) {
7711      if (item) {
7712        var tmp = item.split(propertyDelimiter);
7713        tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
7714      }
7715    });

7716    return res
7717  });
7718
7719  // merge static and dynamic style data on the same vnode
7720  function normalizeStyleData (data) {
7721    var style = normalizeStyleBinding(data.style);
7722    // static style is pre-processed into an object during compilation
7723    // and is always a fresh object, so it's safe to merge into it
7724    return data.staticStyle
7725      ? extend(data.staticStyle, style)
7726      : style
7727  }
7728
7729  // normalize possible array / string values into Object
7730  function normalizeStyleBinding (bindingStyle) {
7731    if (Array.isArray(bindingStyle)) {
7732      return toObject(bindingStyle)
7733    }
7734    if (typeof bindingStyle === 'string') {
7735      return parseStyleText(bindingStyle)
7736    }
7737    return bindingStyle
7738  }
7739
7740  /**
7741   * parent component style should be after child's
7742   * so that parent component's style could override it
7743   */
7744  function getStyle (vnode, checkChild) {
7745    var res = {};
7746    var styleData;
7747
7748    if (checkChild) {
7749      var childNode = vnode;
7750      while (childNode.componentInstance) {
7751        childNode = childNode.componentInstance._vnode;
7752        if (
7753          childNode && childNode.data &&
7754          (styleData = normalizeStyleData(childNode.data))
7755        ) {
7756          extend(res, styleData);
7757        }
7758      }
7759    }
7760
7761    if ((styleData = normalizeStyleData(vnode.data))) {
7762      extend(res, styleData);
7763    }
7764
7765    var parentNode = vnode;
7766    while ((parentNode = parentNode.parent)) {
7767      if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
7768        extend(res, styleData);
7769      }
7770    }
7771    return res
7772  }
7773
7774  /*  */
7775
7776  var cssVarRE = /^--/;
7777  var importantRE = /\s*!important$/;
7778  var setProp = function (el, name, val) {
7779    /* istanbul ignore if */
7780    if (cssVarRE.test(name)) {
7781      el.style.setProperty(name, val);
7782    } else if (importantRE.test(val)) {
7783      el.style.setProperty(hyphenate(name), val.replace(importantRE, ''), 'important');
7784    } else {
7785      var normalizedName = normalize(name);
7786      if (Array.isArray(val)) {
7787        // Support values array created by autoprefixer, e.g.
7788        // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
7789        // Set them one by one, and the browser will only set those it can recognize
7790        for (var i = 0, len = val.length; i < len; i++) {
7791          el.style[normalizedName] = val[i];
7792        }
7793      } else {
7794        el.style[normalizedName] = val;
7795      }
7796    }
7797  };
7798
7799  var vendorNames = ['Webkit', 'Moz', 'ms'];
7800
7801  var emptyStyle;
7802  var normalize = cached(function (prop) {
7803    emptyStyle = emptyStyle || document.createElement('div').style;
7804    prop = camelize(prop);
7805    if (prop !== 'filter' && (prop in emptyStyle)) {
7806      return prop
7807    }
7808    var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
7809    for (var i = 0; i < vendorNames.length; i++) {
7810      var name = vendorNames[i] + capName;
7811      if (name in emptyStyle) {
7812        return name
7813      }
7814    }
7815  });
7816
7817  function updateStyle (oldVnode, vnode) {
7818    var data = vnode.data;
7819    var oldData = oldVnode.data;
7820
7821    if (isUndef(data.staticStyle) && isUndef(data.style) &&
7822      isUndef(oldData.staticStyle) && isUndef(oldData.style)
7823    ) {
7824      return
7825    }
7826
7827    var cur, name;
7828    var el = vnode.elm;
7829    var oldStaticStyle = oldData.staticStyle;
7830    var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};
7831
7832    // if static style exists, stylebinding already merged into it when doing normalizeStyleData
7833    var oldStyle = oldStaticStyle || oldStyleBinding;
7834
7835    var style = normalizeStyleBinding(vnode.data.style) || {};
7836
7837    // store normalized style under a different key for next diff
7838    // make sure to clone it if it's reactive, since the user likely wants
7839    // to mutate it.
7840    vnode.data.normalizedStyle = isDef(style.__ob__)
7841      ? extend({}, style)
7842      : style;
7843
7844    var newStyle = getStyle(vnode, true);
7845
7846    for (name in oldStyle) {
7847      if (isUndef(newStyle[name])) {
7848        setProp(el, name, '');
7849      }
7850    }
7851    for (name in newStyle) {
7852      cur = newStyle[name];
7853      if (cur !== oldStyle[name]) {
7854        // ie9 setting to null has no effect, must use empty string
7855        setProp(el, name, cur == null ? '' : cur);
7856      }
7857    }
7858  }
7859
7860  var style = {
7861    create: updateStyle,
7862    update: updateStyle
7863  };
7864
7865  /*  */
7866
7867  var whitespaceRE = /\s+/;
7868
7869  /**
7870   * Add class with compatibility for SVG since classList is not supported on
7871   * SVG elements in IE
7872   */
7873  function addClass (el, cls) {
7874    /* istanbul ignore if */
7875    if (!cls || !(cls = cls.trim())) {
7876      return
7877    }
7878
7879    /* istanbul ignore else */
7880    if (el.classList) {
7881      if (cls.indexOf(' ') > -1) {

7882        cls.split(whitespaceRE).forEach(function (c) { return el.classList.add(c); });
7883      } else {
7884        el.classList.add(cls);
7885      }
7886    } else {
7887      var cur = " " + (el.getAttribute('class') || '') + " ";
7888      if (cur.indexOf(' ' + cls + ' ') < 0) {
7889        el.setAttribute('class', (cur + cls).trim());
7890      }
7891    }
7892  }
7893
7894  /**
7895   * Remove class with compatibility for SVG since classList is not supported on
7896   * SVG elements in IE
7897   */
7898  function removeClass (el, cls) {
7899    /* istanbul ignore if */
7900    if (!cls || !(cls = cls.trim())) {
7901      return
7902    }
7903
7904    /* istanbul ignore else */
7905    if (el.classList) {
7906      if (cls.indexOf(' ') > -1) {
7907        cls.split(whitespaceRE).forEach(function (c) { return el.classList.remove(c); });
7908      } else {
7909        el.classList.remove(cls);
7910      }
7911      if (!el.classList.length) {
7912        el.removeAttribute('class');
7913      }
7914    } else {
7915      var cur = " " + (el.getAttribute('class') || '') + " ";
7916      var tar = ' ' + cls + ' ';
7917      while (cur.indexOf(tar) >= 0) {
7918        cur = cur.replace(tar, ' ');
7919      }
7920      cur = cur.trim();
7921      if (cur) {
7922        el.setAttribute('class', cur);
7923      } else {
7924        el.removeAttribute('class');
7925      }
7926    }
7927  }
7928
7929  /*  */
7930
7931  function resolveTransition (def$$1) {
7932    if (!def$$1) {
7933      return
7934    }
7935    /* istanbul ignore else */
7936    if (typeof def$$1 === 'object') {
7937      var res = {};
7938      if (def$$1.css !== false) {
7939        extend(res, autoCssTransition(def$$1.name || 'v'));
7940      }
7941      extend(res, def$$1);
7942      return res
7943    } else if (typeof def$$1 === 'string') {
7944      return autoCssTransition(def$$1)
7945    }
7946  }
7947
7948  var autoCssTransition = cached(function (name) {
7949    return {
7950      enterClass: (name + "-enter"),
7951      enterToClass: (name + "-enter-to"),
7952      enterActiveClass: (name + "-enter-active"),
7953      leaveClass: (name + "-leave"),
7954      leaveToClass: (name + "-leave-to"),
7955      leaveActiveClass: (name + "-leave-active")
7956    }
7957  });
7958
7959  var hasTransition = inBrowser && !isIE9;
7960  var TRANSITION = 'transition';
7961  var ANIMATION = 'animation';
7962
7963  // Transition property/event sniffing
7964  var transitionProp = 'transition';
7965  var transitionEndEvent = 'transitionend';
7966  var animationProp = 'animation';
7967  var animationEndEvent = 'animationend';
7968  if (hasTransition) {
7969    /* istanbul ignore if */
7970    if (window.ontransitionend === undefined &&
7971      window.onwebkittransitionend !== undefined
7972    ) {
7973      transitionProp = 'WebkitTransition';
7974      transitionEndEvent = 'webkitTransitionEnd';
7975    }
7976    if (window.onanimationend === undefined &&
7977      window.onwebkitanimationend !== undefined
7978    ) {
7979      animationProp = 'WebkitAnimation';
7980      animationEndEvent = 'webkitAnimationEnd';
7981    }
7982  }
7983
7984  // binding to window is necessary to make hot reload work in IE in strict mode
7985  var raf = inBrowser
7986    ? window.requestAnimationFrame
7987      ? window.requestAnimationFrame.bind(window)
7988      : setTimeout
7989    : /* istanbul ignore next */ function (fn) { return fn(); };
7990
7991  function nextFrame (fn) {
7992    raf(function () {
7993      raf(fn);
7994    });
7995  }
7996
7997  function addTransitionClass (el, cls) {
7998    var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
7999    if (transitionClasses.indexOf(cls) < 0) {
8000      transitionClasses.push(cls);
8001      addClass(el, cls);
8002    }
8003  }
8004
8005  function removeTransitionClass (el, cls) {
8006    if (el._transitionClasses) {
8007      remove(el._transitionClasses, cls);
8008    }
8009    removeClass(el, cls);
8010  }
8011
8012  function whenTransitionEnds (
8013    el,
8014    expectedType,
8015    cb
8016  ) {
8017    var ref = getTransitionInfo(el, expectedType);
8018    var type = ref.type;
8019    var timeout = ref.timeout;
8020    var propCount = ref.propCount;
8021    if (!type) { return cb() }
8022    var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
8023    var ended = 0;
8024    var end = function () {
8025      el.removeEventListener(event, onEnd);
8026      cb();
8027    };
8028    var onEnd = function (e) {
8029      if (e.target === el) {
8030        if (++ended >= propCount) {
8031          end();
8032        }
8033      }
8034    };
8035    setTimeout(function () {
8036      if (ended < propCount) {
8037        end();
8038      }
8039    }, timeout + 1);
8040    el.addEventListener(event, onEnd);
8041  }
8042
8043  var transformRE = /\b(transform|all)(,|$)/;
8044
8045  function getTransitionInfo (el, expectedType) {
8046    var styles = window.getComputedStyle(el);
8047    // JSDOM may return undefined for transition properties
8048    var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');
8049    var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');
8050    var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
8051    var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');
8052    var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');
8053    var animationTimeout = getTimeout(animationDelays, animationDurations);
8054
8055    var type;
8056    var timeout = 0;
8057    var propCount = 0;
8058    /* istanbul ignore if */
8059    if (expectedType === TRANSITION) {
8060      if (transitionTimeout > 0) {
8061        type = TRANSITION;
8062        timeout = transitionTimeout;
8063        propCount = transitionDurations.length;
8064      }
8065    } else if (expectedType === ANIMATION) {
8066      if (animationTimeout > 0) {
8067        type = ANIMATION;
8068        timeout = animationTimeout;
8069        propCount = animationDurations.length;
8070      }
8071    } else {
8072      timeout = Math.max(transitionTimeout, animationTimeout);
8073      type = timeout > 0
8074        ? transitionTimeout > animationTimeout
8075          ? TRANSITION
8076          : ANIMATION
8077        : null;
8078      propCount = type
8079        ? type === TRANSITION
8080          ? transitionDurations.length
8081          : animationDurations.length
8082        : 0;
8083    }
8084    var hasTransform =
8085      type === TRANSITION &&
8086      transformRE.test(styles[transitionProp + 'Property']);
8087    return {
8088      type: type,
8089      timeout: timeout,
8090      propCount: propCount,
8091      hasTransform: hasTransform
8092    }
8093  }
8094
8095  function getTimeout (delays, durations) {
8096    /* istanbul ignore next */
8097    while (delays.length < durations.length) {
8098      delays = delays.concat(delays);
8099    }
8100
8101    return Math.max.apply(null, durations.map(function (d, i) {
8102      return toMs(d) + toMs(delays[i])
8103    }))
8104  }
8105
8106  // Old versions of Chromium (below 61.0.3163.100) formats floating pointer numbers
8107  // in a locale-dependent way, using a comma instead of a dot.
8108  // If comma is not replaced with a dot, the input will be rounded down (i.e. acting
8109  // as a floor function) causing unexpected behaviors
8110  function toMs (s) {
8111    return Number(s.slice(0, -1).replace(',', '.')) * 1000
8112  }
8113
8114  /*  */
8115
8116  function enter (vnode, toggleDisplay) {
8117    var el = vnode.elm;
8118
8119    // call leave callback now
8120    if (isDef(el._leaveCb)) {
8121      el._leaveCb.cancelled = true;
8122      el._leaveCb();
8123    }
8124
8125    var data = resolveTransition(vnode.data.transition);
8126    if (isUndef(data)) {
8127      return
8128    }
8129
8130    /* istanbul ignore if */
8131    if (isDef(el._enterCb) || el.nodeType !== 1) {
8132      return
8133    }
8134
8135    var css = data.css;
8136    var type = data.type;
8137    var enterClass = data.enterClass;
8138    var enterToClass = data.enterToClass;
8139    var enterActiveClass = data.enterActiveClass;
8140    var appearClass = data.appearClass;
8141    var appearToClass = data.appearToClass;
8142    var appearActiveClass = data.appearActiveClass;
8143    var beforeEnter = data.beforeEnter;
8144    var enter = data.enter;
8145    var afterEnter = data.afterEnter;
8146    var enterCancelled = data.enterCancelled;
8147    var beforeAppear = data.beforeAppear;
8148    var appear = data.appear;
8149    var afterAppear = data.afterAppear;
8150    var appearCancelled = data.appearCancelled;
8151    var duration = data.duration;
8152
8153    // activeInstance will always be the <transition> component managing this
8154    // transition. One edge case to check is when the <transition> is placed
8155    // as the root node of a child component. In that case we need to check
8156    // <transition>'s parent for appear check.
8157    var context = activeInstance;
8158    var transitionNode = activeInstance.$vnode;
8159    while (transitionNode && transitionNode.parent) {
8160      context = transitionNode.context;
8161      transitionNode = transitionNode.parent;
8162    }
8163
8164    var isAppear = !context._isMounted || !vnode.isRootInsert;
8165
8166    if (isAppear && !appear && appear !== '') {
8167      return
8168    }
8169
8170    var startClass = isAppear && appearClass
8171      ? appearClass
8172      : enterClass;
8173    var activeClass = isAppear && appearActiveClass
8174      ? appearActiveClass
8175      : enterActiveClass;
8176    var toClass = isAppear && appearToClass
8177      ? appearToClass
8178      : enterToClass;
8179
8180    var beforeEnterHook = isAppear
8181      ? (beforeAppear || beforeEnter)
8182      : beforeEnter;
8183    var enterHook = isAppear
8184      ? (typeof appear === 'function' ? appear : enter)
8185      : enter;
8186    var afterEnterHook = isAppear
8187      ? (afterAppear || afterEnter)
8188      : afterEnter;
8189    var enterCancelledHook = isAppear
8190      ? (appearCancelled || enterCancelled)
8191      : enterCancelled;
8192
8193    var explicitEnterDuration = toNumber(
8194      isObject(duration)
8195        ? duration.enter
8196        : duration
8197    );
8198
8199    if (explicitEnterDuration != null) {
8200      checkDuration(explicitEnterDuration, 'enter', vnode);
8201    }
8202
8203    var expectsCSS = css !== false && !isIE9;
8204    var userWantsControl = getHookArgumentsLength(enterHook);

8205
8206    var cb = el._enterCb = once(function () {
8207      if (expectsCSS) {
8208        removeTransitionClass(el, toClass);
8209        removeTransitionClass(el, activeClass);
8210      }
8211      if (cb.cancelled) {
8212        if (expectsCSS) {
8213          removeTransitionClass(el, startClass);
8214        }
8215        enterCancelledHook && enterCancelledHook(el);
8216      } else {
8217        afterEnterHook && afterEnterHook(el);
8218      }
8219      el._enterCb = null;
8220    });
8221
8222    if (!vnode.data.show) {
8223      // remove pending leave element on enter by injecting an insert hook
8224      mergeVNodeHook(vnode, 'insert', function () {
8225        var parent = el.parentNode;
8226        var pendingNode = parent && parent._pending && parent._pending[vnode.key];
8227        if (pendingNode &&
8228          pendingNode.tag === vnode.tag &&
8229          pendingNode.elm._leaveCb
8230        ) {
8231          pendingNode.elm._leaveCb();
8232        }
8233        enterHook && enterHook(el, cb);
8234      });
8235    }
8236
8237    // start enter transition
8238    beforeEnterHook && beforeEnterHook(el);
8239    if (expectsCSS) {
8240      addTransitionClass(el, startClass);
8241      addTransitionClass(el, activeClass);
8242      nextFrame(function () {
8243        removeTransitionClass(el, startClass);
8244        if (!cb.cancelled) {
8245          addTransitionClass(el, toClass);
8246          if (!userWantsControl) {
8247            if (isValidDuration(explicitEnterDuration)) {
8248              setTimeout(cb, explicitEnterDuration);
8249            } else {
8250              whenTransitionEnds(el, type, cb);
8251            }
8252          }
8253        }
8254      });
8255    }
8256
8257    if (vnode.data.show) {
8258      toggleDisplay && toggleDisplay();
8259      enterHook && enterHook(el, cb);
8260    }
8261
8262    if (!expectsCSS && !userWantsControl) {
8263      cb();
8264    }
8265  }
8266
8267  function leave (vnode, rm) {
8268    var el = vnode.elm;
8269
8270    // call enter callback now
8271    if (isDef(el._enterCb)) {
8272      el._enterCb.cancelled = true;
8273      el._enterCb();
8274    }
8275
8276    var data = resolveTransition(vnode.data.transition);
8277    if (isUndef(data) || el.nodeType !== 1) {
8278      return rm()
8279    }
8280
8281    /* istanbul ignore if */
8282    if (isDef(el._leaveCb)) {
8283      return
8284    }
8285
8286    var css = data.css;
8287    var type = data.type;
8288    var leaveClass = data.leaveClass;
8289    var leaveToClass = data.leaveToClass;
8290    var leaveActiveClass = data.leaveActiveClass;
8291    var beforeLeave = data.beforeLeave;
8292    var leave = data.leave;
8293    var afterLeave = data.afterLeave;
8294    var leaveCancelled = data.leaveCancelled;
8295    var delayLeave = data.delayLeave;
8296    var duration = data.duration;
8297
8298    var expectsCSS = css !== false && !isIE9;
8299    var userWantsControl = getHookArgumentsLength(leave);
8300
8301    var explicitLeaveDuration = toNumber(
8302      isObject(duration)
8303        ? duration.leave
8304        : duration
8305    );
8306
8307    if (isDef(explicitLeaveDuration)) {
8308      checkDuration(explicitLeaveDuration, 'leave', vnode);
8309    }
8310
8311    var cb = el._leaveCb = once(function () {
8312      if (el.parentNode && el.parentNode._pending) {
8313        el.parentNode._pending[vnode.key] = null;
8314      }
8315      if (expectsCSS) {
8316        removeTransitionClass(el, leaveToClass);
8317        removeTransitionClass(el, leaveActiveClass);
8318      }
8319      if (cb.cancelled) {
8320        if (expectsCSS) {
8321          removeTransitionClass(el, leaveClass);
8322        }
8323        leaveCancelled && leaveCancelled(el);
8324      } else {
8325        rm();
8326        afterLeave && afterLeave(el);
8327      }
8328      el._leaveCb = null;
8329    });
8330
8331    if (delayLeave) {
8332      delayLeave(performLeave);
8333    } else {
8334      performLeave();
8335    }
8336
8337    function performLeave () {
8338      // the delayed leave may have already been cancelled
8339      if (cb.cancelled) {
8340        return
8341      }
8342      // record leaving element
8343      if (!vnode.data.show && el.parentNode) {
8344        (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
8345      }
8346      beforeLeave && beforeLeave(el);
8347      if (expectsCSS) {
8348        addTransitionClass(el, leaveClass);
8349        addTransitionClass(el, leaveActiveClass);
8350        nextFrame(function () {
8351          removeTransitionClass(el, leaveClass);
8352          if (!cb.cancelled) {
8353            addTransitionClass(el, leaveToClass);
8354            if (!userWantsControl) {
8355              if (isValidDuration(explicitLeaveDuration)) {
8356                setTimeout(cb, explicitLeaveDuration);
8357              } else {
8358                whenTransitionEnds(el, type, cb);
8359              }
8360            }
8361          }
8362        });
8363      }
8364      leave && leave(el, cb);
8365      if (!expectsCSS && !userWantsControl) {
8366        cb();
8367      }
8368    }
8369  }
8370
8371  // only used in dev mode
8372  function checkDuration (val, name, vnode) {
8373    if (typeof val !== 'number') {
8374      warn(
8375        "<transition> explicit " + name + " duration is not a valid number - " +
8376        "got " + (JSON.stringify(val)) + ".",
8377        vnode.context
8378      );
8379    } else if (isNaN(val)) {
8380      warn(
8381        "<transition>

8381 explicit " + name + " duration is NaN - " +
8382        'the duration expression might be incorrect.',
8383        vnode.context
8384      );
8385    }
8386  }
8387
8388  function isValidDuration (val) {
8389    return typeof val === 'number' && !isNaN(val)
8390  }
8391
8392  /**
8393   * Normalize a transition hook's argument length. The hook may be:
8394   * - a merged hook (invoker) with the original in .fns
8395   * - a wrapped component method (check ._length)
8396   * - a plain function (.length)
8397   */
8398  function getHookArgumentsLength (fn) {
8399    if (isUndef(fn)) {
8400      return false
8401    }
8402    var invokerFns = fn.fns;
8403    if (isDef(invokerFns)) {
8404      // invoker
8405      return getHookArgumentsLength(
8406        Array.isArray(invokerFns)
8407          ? invokerFns[0]
8408          : invokerFns
8409      )
8410    } else {
8411      return (fn._length || fn.length) > 1
8412    }
8413  }
8414
8415  function _enter (_, vnode) {
8416    if (vnode.data.show !== true) {
8417      enter(vnode);
8418    }
8419  }
8420
8421  var transition = inBrowser ? {
8422    create: _enter,
8423    activate: _enter,
8424    remove: function remove$$1 (vnode, rm) {
8425      /* istanbul ignore else */
8426      if (vnode.data.show !== true) {
8427        leave(vnode, rm);
8428      } else {
8429        rm();
8430      }
8431    }
8432  } : {};
8433
8434  var platformModules = [
8435    attrs,
8436    klass,
8437    events,
8438    domProps,
8439    style,
8440    transition
8441  ];
8442
8443  /*  */
8444
8445  // the directive module should be applied last, after all
8446  // built-in modules have been applied.
8447  var modules = platformModules.concat(baseModules);
8448
8449  var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });
8450
8451  /**
8452   * Not type checking this file because flow doesn't like attaching
8453   * properties to Elements.
8454   */
8455
8456  /* istanbul ignore if */
8457  if (isIE9) {
8458    // http://www.matts411.com/post/internet-explorer-9-oninput/
8459    document.addEventListener('selectionchange', function () {
8460      var el = document.activeElement;
8461      if (el && el.vmodel) {
8462        trigger(el, 'input');
8463      }
8464    });
8465  }
8466
8467  var directive = {
8468    inserted: function inserted (el, binding, vnode, oldVnode) {
8469      if (vnode.tag === 'select') {
8470        // #6903
8471        if (oldVnode.elm && !oldVnode.elm._vOptions) {
8472          mergeVNodeHook(vnode, 'postpatch', function () {
8473            directive.componentUpdated(el, binding, vnode);
8474          });
8475        } else {
8476          setSelected(el, binding, vnode.context);
8477        }
8478        el._vOptions = [].map.call(el.options, getValue);
8479      } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
8480        el._vModifiers = binding.modifiers;
8481        if (!binding.modifiers.lazy) {
8482          el.addEventListener('compositionstart', onCompositionStart);
8483          el.addEventListener('compositionend', onCompositionEnd);
8484          // Safari < 10.2 & UIWebView doesn't fire compositionend when
8485          // switching focus before confirming composition choice
8486          // this also fixes the issue where some browsers e.g. iOS Chrome
8487          // fires "change" instead of "input" on autocomplete.
8488          el.addEventListener('change', onCompositionEnd);
8489          /* istanbul ignore if */
8490          if (isIE9) {
8491            el.vmodel = true;
8492          }
8493        }
8494      }
8495    },
8496
8497    componentUpdated: function componentUpdated (el, binding, vnode) {
8498      if (vnode.tag === 'select') {
8499        setSelected(el, binding, vnode.context);
8500        // in case the options rendered by v-for have changed,
8501        // it's possible that the value is out-of-sync with the rendered options.
8502        // detect such cases and filter out values that no longer has a matching
8503        // option in the DOM.
8504        var prevOptions = el._vOptions;
8505        var curOptions = el._vOptions = [].map.call(el.options, getValue);
8506        if (curOptions.some(function (o, i) { return !looseEqual(o, prevOptions[i]); })) {
8507          // trigger change event if
8508          // no matching option found for at least one value
8509          var needReset = el.multiple
8510            ? binding.value.some(function (v) { return hasNoMatchingOption(v, curOptions); })
8511            : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
8512          if (needReset) {
8513            trigger(el, 'change');
8514          }
8515        }
8516      }
8517    }
8518  };
8519
8520  function setSelected (el, binding, vm) {
8521    actuallySetSelected(el, binding, vm);
8522    /* istanbul ignore if */
8523    if (isIE || isEdge) {
8524      setTimeout(function () {
8525        actuallySetSelected(el, binding, vm);
8526      }, 0);
8527    }
8528  }
8529
8530  function actuallySetSelected (el, binding, vm) {
8531    var value = binding.value;
8532    var isMultiple = el.multiple;
8533    if (isMultiple && !Array.isArray(value)) {
8534      warn(
8535        "<select multiple v-model=\"" + (binding.expression) + "\"> " +
8536        "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
8537        vm
8538      );
8539      return
8540    }
8541    var selected, option;
8542    for (var i = 0, l = el.options.length; i < l; i++) {
8543      option = el.options[i];
8544      if (isMultiple) {
8545        selected = looseIndexOf(value, getValue(option)) > -1;
8546        if (option.selected !== selected) {
8547          option.selected = selected;
8548        }
8549      } else {
8550        if (looseEqual(getValue(option), value)) {
8551          if (el.selectedIndex !== i) {
8552            el.selectedIndex = i;
8553          }
8554          return
8555        }
8556      }
8557    }
8558    if (!isMultiple) {
8559      el.selectedIndex = -1;
8560    }
8561  }
8562
8563  function hasNoMatchingOption (value, options) {
8564    return options.every(function (o) { return !looseEqual(o, value); })
8565  }
8566
8567  function getValue (option) {
8568    return '_value' in option
8569      ? option._value
8570      : option.value
8571  }
8572
8573  function onCompositionStart (e) {
8574    e.target.composing = true;
8575  }
8576
8577  function onCompositionEnd (e) {
8578    // prevent triggering an input event for no reason
8579    if (!e.target.composing) { return }
8580    e.target.composing = false;
8581    trigger(e.target, 'input');
8582  }
8583
8584  function trigger (el, type) {
8585    var e = document.createEvent('HTMLEvents');
8586    e.initEvent(type, true, true);
8587    el.dispatchEvent(e);
8588  }
8589
8590  /*  */
8591
8592  // recursively search for possible transition defined inside the component root
8593  function locateNode (vnode) {
8594    return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
8595      ? locateNode(vnode.componentInstance._vnode)
8596      : vnode
8597  }
8598
8599  var show = {
8600    bind: function bind (el, ref, vnode) {
8601      var value = ref.value;
8602
8603      vnode = locateNode(vnode);
8604      var transition$$1 = vnode.data && vnode.data.transition;
8605      var originalDisplay = el.__vOriginalDisplay =
8606        el.style.display === 'none' ? '' : el.style.display;
8607      if (value && transition$$1) {
8608        vnode.data.show = true;
8609        enter(vnode, function () {
8610          el.style.display = originalDisplay;
8611        });
8612      } else {
8613        el.style.display = value ? originalDisplay : 'none';
8614      }
8615    },
8616
8617    update: function update (el, ref, vnode) {
8618      var value = ref.value;
8619      var oldValue = ref.oldValue;
8620
8621      /* istanbul ignore if */
8622      if (!value === !oldValue) { return }
8623      vnode = locateNode(vnode);
8624      var transition$$1 = vnode.data && vnode.data.transition;
8625      if (transition$$1) {
8626        vnode.data.show = true;
8627        if (value) {
8628          enter(vnode, function () {
8629            el.style.display = el.__vOriginalDisplay;
8630          });
8631        } else {
8632          leave(vnode, function () {
8633            el.style.display = 'none';
8634          });
8635        }
8636      } else {
8637        el.style.display = value ? el.__vOriginalDisplay : 'none';
8638      }
8639    },
8640
8641    unbind: function unbind (
8642      el,
8643      binding,
8644      vnode,
8645      oldVnode,

8646      isDestroy
8647    ) {
8648      if (!isDestroy) {
8649        el.style.display = el.__vOriginalDisplay;
8650      }
8651    }
8652  };
8653
8654  var platformDirectives = {
8655    model: directive,
8656    show: show
8657  };
8658
8659  /*  */
8660
8661  var transitionProps = {
8662    name: String,
8663    appear: Boolean,
8664    css: Boolean,
8665    mode: String,
8666    type: String,
8667    enterClass: String,
8668    leaveClass: String,
8669    enterToClass: String,
8670    leaveToClass: String,
8671    enterActiveClass: String,
8672    leaveActiveClass: String,
8673    appearClass: String,
8674    appearActiveClass: String,
8675    appearToClass: String,
8676    duration: [Number, String, Object]
8677  };
8678
8679  // in case the child is also an abstract component, e.g. <keep-alive>
8680  // we want to recursively retrieve the real component to be rendered
8681  function getRealChild (vnode) {
8682    var compOptions = vnode && vnode.componentOptions;
8683    if (compOptions && compOptions.Ctor.options.abstract) {
8684      return getRealChild(getFirstComponentChild(compOptions.children))
8685    } else {
8686      return vnode
8687    }
8688  }
8689
8690  function extractTransitionData (comp) {
8691    var data = {};
8692    var options = comp.$options;
8693    // props
8694    for (var key in options.propsData) {
8695      data[key] = comp[key];
8696    }
8697    // events.
8698    // extract listeners and pass them directly to the transition methods
8699    var listeners = options._parentListeners;
8700    for (var key$1 in listeners) {
8701      data[camelize(key$1)] = listeners[key$1];
8702    }
8703    return data
8704  }
8705
8706  function placeholder (h, rawChild) {
8707    if (/\d-keep-alive$/.test(rawChild.tag)) {
8708      return h('keep-alive', {
8709        props: rawChild.componentOptions.propsData
8710      })
8711    }
8712  }
8713
8714  function hasParentTransition (vnode) {
8715    while ((vnode = vnode.parent)) {
8716      if (vnode.data.transition) {
8717        return true
8718      }
8719    }
8720  }
8721
8722  function isSameChild (child, oldChild) {
8723    return oldChild.key === child.key && oldChild.tag === child.tag
8724  }
8725
8726  var isNotTextNode = function (c) { return c.tag || isAsyncPlaceholder(c); };
8727
8728  var isVShowDirective = function (d) { return d.name === 'show'; };
8729
8730  var Transition = {
8731    name: 'transition',
8732    props: transitionProps,
8733    abstract: true,
8734
8735    render: function render (h) {
8736      var this$1 = this;
8737
8738      var children = this.$slots.default;
8739      if (!children) {
8740        return
8741      }
8742
8743      // filter out text nodes (possible whitespaces)
8744      children = children.filter(isNotTextNode);
8745      /* istanbul ignore if */
8746      if (!children.length) {
8747        return
8748      }
8749
8750      // warn multiple elements
8751      if (children.length > 1) {
8752        warn(
8753          '<transition> can only be used on a single element. Use ' +
8754          '<transition-group> for lists.',
8755          this.$parent
8756        );
8757      }
8758
8759      var mode = this.mode;
8760
8761      // warn invalid mode
8762      if (mode && mode !== 'in-out' && mode !== 'out-in'
8763      ) {
8764        warn(
8765          'invalid <transition> mode: ' + mode,
8766          this.$parent
8767        );
8768      }
8769
8770      var rawChild = children[0];
8771
8772      // if this is a component root node and the component's
8773      // parent container node also has transition, skip.
8774      if (hasParentTransition(this.$vnode)) {
8775        return rawChild
8776      }
8777
8778      // apply transition data to child
8779      // use getRealChild() to ignore abstract components e.g. keep-alive
8780      var child = getRealChild(rawChild);
8781      /* istanbul ignore if */
8782      if (!child) {
8783        return rawChild
8784      }
8785
8786      if (this._leaving) {
8787        return placeholder(h, rawChild)
8788      }
8789
8790      // ensure a key that is unique to the vnode type and to this transition
8791      // component instance. This key will be used to remove pending leaving nodes
8792      // during entering.
8793      var id = "__transition-" + (this._uid) + "-";
8794      child.key = child.key == null
8795        ? child.isComment
8796          ? id + 'comment'
8797          : id + child.tag
8798        : isPrimitive(child.key)
8799          ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
8800          : child.key;
8801
8802      var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
8803      var oldRawChild = this._vnode;

8804      var oldChild = getRealChild(oldRawChild);
8805
8806      // mark v-show
8807      // so that the transition module can hand over the control to the directive
8808      if (child.data.directives && child.data.directives.some(isVShowDirective)) {
8809        child.data.show = true;
8810      }
8811
8812      if (
8813        oldChild &&
8814        oldChild.data &&
8815        !isSameChild(child, oldChild) &&
8816        !isAsyncPlaceholder(oldChild) &&
8817        // #6687 component root is a comment node
8818        !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
8819      ) {
8820        // replace old child transition data with fresh one
8821        // important for dynamic transitions!
8822        var oldData = oldChild.data.transition = extend({}, data);
8823        // handle transition mode
8824        if (mode === 'out-in') {
8825          // return placeholder node and queue update when leave finishes
8826          this._leaving = true;
8827          mergeVNodeHook(oldData, 'afterLeave', function () {
8828            this$1._leaving = false;
8829            this$1.$forceUpdate();
8830          });
8831          return placeholder(h, rawChild)
8832        } else if (mode === 'in-out') {
8833          if (isAsyncPlaceholder(child)) {
8834            return oldRawChild
8835          }
8836          var delayedLeave;
8837          var performLeave = function () { delayedLeave(); };
8838          mergeVNodeHook(data, 'afterEnter', performLeave);
8839          mergeVNodeHook(data, 'enterCancelled', performLeave);
8840          mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
8841        }
8842      }
8843
8844      return rawChild
8845    }
8846  };
8847
8848  /*  */
8849
8850  var props = extend({
8851    tag: String,
8852    moveClass: String
8853  }, transitionProps);
8854
8855  delete props.mode;
8856
8857  var TransitionGroup = {
8858    props: props,
8859
8860    beforeMount: function beforeMount () {
8861      var this$1 = this;
8862
8863      var update = this._update;
8864      this._update = function (vnode, hydrating) {
8865        var restoreActiveInstance = setActiveInstance(this$1);
8866        // force removing pass
8867        this$1.__patch__(
8868          this$1._vnode,
8869          this$1.kept,
8870          false, // hydrating
8871          true // removeOnly (!important, avoids unnecessary moves)
8872        );
8873        this$1._vnode = this$1.kept;
8874        restoreActiveInstance();
8875        update.call(this$1, vnode, hydrating);
8876      };
8877    },
8878
8879    render: function render (h) {
8880      var tag = this.tag || this.$vnode.data.tag || 'span';
8881      var map = Object.create(null);
8882      var prevChildren = this.prevChildren = this.children;
8883      var rawChildren = this.$slots.default || [];
8884      var children = this.children = [];
8885      var transitionData = extractTransitionData(this);
8886
8887      for (var i = 0; i < rawChildren.length; i++) {
8888        var c = rawChildren[i];
8889        if (c.tag) {
8890          if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
8891            children.push(c);
8892            map[c.key] = c
8893            ;(c.data || (c.data = {})).transition = transitionData;
8894          } else {
8895            var opts = c.componentOptions;
8896            var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
8897            warn(("<transition-group> children must be keyed: <" + name + ">"));
8898          }
8899        }
8900      }
8901
8902      if (prevChildren) {
8903        var kept = [];
8904        var removed = [];
8905        for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
8906          var c$1 = prevChildren[i$1];
8907          c$1.data.transition = transitionData;
8908          c$1.data.pos = c$1.elm.getBoundingClientRect();
8909          if (map[c$1.key]) {
8910            kept.push(c$1);
8911          } else {
8912            removed.push(c$1);
8913          }
8914        }
8915        this.kept = h(tag, null, kept);
8916        this.removed = removed;
8917      }
8918
8919      return h(tag, null, children)
8920    },
8921
8922    updated: function updated () {
8923      var children = this.prevChildren;
8924      var moveClass = this.moveClass || ((this.name || 'v') + '-move');
8925      if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
8926        return
8927      }
8928
8929      // we divide the work into three loops to avoid mixing DOM reads and writes
8930      // in each iteration - which helps prevent layout thrashing.

8931      children.forEach(callPendingCbs);
8932      children.forEach(recordPosition);
8933      children.forEach(applyTranslation);
8934
8935      // force reflow to put everything in position
8936      // assign to this to avoid being removed in tree-shaking
8937      // $flow-disable-line
8938      this._reflow = document.body.offsetHeight;
8939
8940      children.forEach(function (c) {
8941        if (c.data.moved) {
8942          var el = c.elm;
8943          var s = el.style;
8944          addTransitionClass(el, moveClass);
8945          s.transform = s.WebkitTransform = s.transitionDuration = '';
8946          el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
8947            if (e && e.target !== el) {
8948              return
8949            }
8950            if (!e || /transform$/.test(e.propertyName)) {
8951              el.removeEventListener(transitionEndEvent, cb);
8952              el._moveCb = null;
8953              removeTransitionClass(el, moveClass);
8954            }
8955          });
8956        }
8957      });
8958    },
8959
8960    methods: {
8961      hasMove: function hasMove (el, moveClass) {
8962        /* istanbul ignore if */
8963        if (!hasTransition) {
8964          return false
8965        }
8966        /* istanbul ignore if */
8967        if (this._hasMove) {
8968          return this._hasMove
8969        }
8970        // Detect whether an element with the move class applied has
8971        // CSS transitions. Since the element may be inside an entering
8972        // transition at this very moment, we make a clone of it and remove
8973        // all other transition classes applied to ensure only the move class
8974        // is applied.
8975        var clone = el.cloneNode();
8976        if (el._transitionClasses) {
8977          el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
8978        }
8979        addClass(clone, moveClass);
8980        clone.style.display = 'none';
8981        this.$el.appendChild(clone);
8982        var info = getTransitionInfo(clone);
8983        this.$el.removeChild(clone);
8984        return (this._hasMove = info.hasTransform)
8985      }
8986    }
8987  };
8988
8989  function callPendingCbs (c) {
8990    /* istanbul ignore if */
8991    if (c.elm._moveCb) {
8992      c.elm._moveCb();
8993    }
8994    /* istanbul ignore if */
8995    if (c.elm._enterCb) {
8996      c.elm._enterCb();
8997    }
8998  }
8999
9000  function recordPosition (c) {
9001    c.data.newPos = c.elm.getBoundingClientRect();
9002  }
9003
9004  function applyTranslation (c) {
9005    var oldPos = c.data.pos;
9006    var newPos = c.data.newPos;
9007    var dx = oldPos.left - newPos.left;
9008    var dy = oldPos.top - newPos.top;
9009    if (dx || dy) {
9010      c.data.moved = true;
9011      var s = c.elm.style;
9012      s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
9013      s.transitionDuration = '0s';
9014    }
9015  }
9016
9017  var platformComponents = {
9018    Transition: Transition,
9019    TransitionGroup: TransitionGroup
9020  };
9021
9022  /*  */
9023
9024  // install platform specific utils
9025  Vue.config.mustUseProp = mustUseProp;
9026  Vue.config.isReservedTag = isReservedTag;
9027  Vue.config.isReservedAttr = isReservedAttr;
9028  Vue.config.getTagNamespace = getTagNamespace;
9029  Vue.config.isUnknownElement = isUnknownElement;
9030
9031  // install platform runtime directives & components
9032  extend(Vue.options.directives, platformDirectives);
9033  extend(Vue.options.components, platformComponents);
9034
9035  // install platform patch function
9036  Vue.prototype.__patch__ = inBrowser ? patch : noop;
9037
9038  // public mount method
9039  Vue.prototype.$mount = function (
9040    el,
9041    hydrating
9042  ) {
9043    el = el && inBrowser ? query(el) : undefined;
9044    return mountComponent(this, el, hydrating)
9045  };
9046
9047  // devtools global hook
9048  /* istanbul ignore next */
9049  if (inBrowser) {
9050    setTimeout(function () {
9051      if (config.devtools) {
9052        if (devtools) {
9053          devtools.emit('init', Vue);
9054        } else {
9055          console[console.info ? 'info' : 'log'](
9056            'Download the Vue Devtools extension for a better development experience:\n' +
9057            'https://github.com/vuejs/vue-devtools'
9058          );
9059        }
9060      }
9061      if (config.productionTip !== false &&
9062        typeof console !== 'undefined'
9063      ) {
9064        console[console.info ? 'info' : 'log'](
9065          "You are running Vue in development mode.\n" +
9066          "Make sure to turn on production mode when deploying for production.\n" +
9067          "See more tips at https://vuejs.org/guide/deployment.html"
9068        );
9069      }
9070    }, 0);
9071  }
9072
9073  /*  */
9074
9075  var defaultTagRE = /\{\{((?:.|\r?\n)+?)\}\}/g;
9076  var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
9077
9078  var buildRegex = cached(function (delimiters) {
9079    var open = delimiters[0].replace(regexEscapeRE, '\\$&');
9080    var close = delimiters[1].replace(regexEscapeRE, '\\$&');
9081    return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
9082  });
9083
9084
9085
9086  function parseText (
9087    text,
9088    delimiters
9089  ) {
9090    var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
9091    if (!tagRE.test(text)) {
9092      return
9093    }
9094    var tokens = [];
9095    var rawTokens = [];
9096    var lastIndex = tagRE.lastIndex = 0;
9097    var match, index, tokenValue;
9098    while ((match = tagRE.exec(text))) {
9099      index = match.index;
9100      // push text token
9101      if (index > lastIndex) {
9102        rawTokens.push(tokenValue = text.slice(lastIndex, index));
9103        tokens.push(JSON.stringify(tokenValue));
9104      }
9105      // tag token
9106      var exp = parseFilters(match[1].trim());
9107      tokens.push(("_s(" + exp + ")"));
9108      rawTokens.push({ '@binding': exp });
9109      lastIndex = index + match[0].length;
9110    }
9111    if (lastIndex < text.length) {
9112      rawTokens.push(tokenValue = text.slice(lastIndex));
9113      tokens.push(JSON.stringify(tokenValue));
9114    }
9115    return {
9116      expression: tokens.join('+'),
9117      tokens: rawTokens
9118    }
9119  }
9120
9121  /*  */
9122
9123  function transformNode (el, options) {
9124    var warn = options.warn || baseWarn;
9125    var staticClass = getAndRemoveAttr(el, 'class');
9126    if (staticClass) {
9127      var res = parseText(staticClass, options.delimiters);
9128      if (res) {
9129        warn(
9130          "class=\"" + staticClass + "\": " +
9131          'Interpolation inside attributes has been removed. ' +
9132          'Use v-bind or the colon shorthand instead. For example, ' +
9133          'instead of <div class="{{ val }}">, use <div :class="val">.',
9134          el.rawAttrsMap['class']
9135        );
9136      }
9137    }
9138    if (staticClass) {
9139      el.staticClass = JSON.stringify(staticClass);
9140    }
9141    var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
9142    if (classBinding) {
9143      el.classBinding = classBinding;
9144    }
9145  }
9146
9147  function genData (el) {
9148    var data = '';
9149    if (el.staticClass) {
9150      data += "staticClass:" + (el.staticClass) + ",";
9151    }
9152    if (el.classBinding) {
9153      data += "class:" + (el.classBinding) + ",";
9154    }
9155    return data
9156  }
9157
9158  var klass$1 = {
9159    staticKeys: ['staticClass'],
9160    transformNode: transformNode,
9161    genData: genData
9162  };
9163
9164  /*  */
9165
9166  function transformNode$1 (el, options) {
9167    var warn = options.warn || baseWarn;
9168    var staticStyle = getAndRemoveAttr(el, 'style');
9169    if (staticStyle) {
9170      /* istanbul ignore if */
9171      {
9172        var res = parseText(staticStyle, options.delimiters);
9173        if (res) {
9174          warn(
9175            "style=\"" + staticStyle + "\": " +
9176            'Interpolation inside attributes has been removed. ' +
9177            'Use v-bind or the colon shorthand instead. For example, ' +
9178            'instead of <div style="{{ val }}">, use <div :style="val">.',
9179            el.rawAttrsMap['style']
9180          );
9181        }
9182      }
9183      el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
9184    }
9185
9186    var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
9187    if (styleBinding) {
9188      el.styleBinding = styleBinding;
9189    }
9190  }
9191
9192  function genData$1 (el) {
9193    var data = '';
9194    if (el.staticStyle) {
9195      data += "staticStyle:" + (el.staticStyle) + ",";
9196    }
9197    if (el.styleBinding) {
9198      data += "style:(" + (el.styleBinding) + "),";
9199    }
9200    return data
9201  }
9202
9203  var style$1 = {
9204    staticKeys: ['staticStyle'],
9205    transformNode: transformNode$1,
9206    genData: genData$1
9207  };
9208
9209  /*  */
9210
9211  var decoder;
9212
9213  var he = {
9214    decode: function decode (html) {
9215      decoder = decoder || document.createElement('div');
9216      decoder.innerHTML = html;
9217      return decoder.textContent
9218    }
9219  };
9220
9221  /*  */
9222
9223  var isUnaryTag = makeMap(
9224    'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
9225    'link,meta,param,source,track,wbr'
9226  );
9227
9228  // Elements that you can, intentionally, leave open
9229  // (and which close themselves)
9230  var canBeLeftOpenTag = makeMap(
9231    'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
9232  );
9233
9234  // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
9235  // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
9236  var isNonPhrasingTag = makeMap(
9237    'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
9238    'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
9239    'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
9240    'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
9241    'title,tr,track'
9242  );
9243
9244  /**
9245   * Not type-checking this file because it's mostly vendor code.
9246   */
9247
9248  // Regular Expressions for parsing tags and attributes
9249  var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
9250  var dynamicArgAttribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
9251  var ncname = "[a-zA-Z_][\\-\\.0-9_a-zA-Z" + (unicodeRegExp.source) + "]*";
9252  var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
9253  var startTagOpen = new RegExp(("^<" + qnameCapture));
9254  var startTagClose = /^\s*(\/?)>/;
9255  var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
9256  var doctype = /^<!DOCTYPE [^>]+>/i;
9257  // #7298: escape - to avoid being passed as HTML comment when inlined in page
9258  var comment = /^<!\--/;
9259  var conditionalComment = /^<!\[/;
9260
9261  // Special Elements (can contain anything)
9262  var isPlainTextElement = makeMap('script,style,textarea', true);
9263  var reCache = {};
9264
9265  var decodingMap = {
9266    '&lt;': '<',
9267    '&gt;': '>',
9268    '&quot;': '"',
9269    '&amp;': '&',
9270    '&#10;': '\n',
9271    '&#9;': '\t',
9272    '&#39;': "'"
9273  };
9274  var encodedAttr = /&(?:lt|gt|quot|amp|#39);/g;
9275  var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;
9276
9277  // #5992
9278  var isIgnoreNewlineTag = makeMap('pre,textarea', true);
9279  var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };
9280
9281  function decodeAttr (value, shouldDecodeNewlines) {
9282    var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
9283    return value.replace(re, function (match) { return decodingMap[match]; })
9284  }
9285
9286  function parseHTML (html, options) {
9287    var stack = [];

9288    var expectHTML = options.expectHTML;
9289    var isUnaryTag$$1 = options.isUnaryTag || no;
9290    var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
9291    var index = 0;
9292    var last, lastTag;
9293    while (html) {
9294      last = html;
9295      // Make sure we're not in a plaintext content element like script/style
9296      if (!lastTag || !isPlainTextElement(lastTag)) {
9297        var textEnd = html.indexOf('<');
9298        if (textEnd === 0) {
9299          // Comment:
9300          if (comment.test(html)) {
9301            var commentEnd = html.indexOf('-->');
9302
9303            if (commentEnd >= 0) {
9304              if (options.shouldKeepComment) {
9305                options.comment(html.substring(4, commentEnd), index, index + commentEnd + 3);
9306              }
9307              advance(commentEnd + 3);
9308              continue
9309            }
9310          }
9311
9312          // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
9313          if (conditionalComment.test(html)) {
9314            var conditionalEnd = html.indexOf(']>');
9315
9316            if (conditionalEnd >= 0) {
9317              advance(conditionalEnd + 2);
9318              continue
9319            }
9320          }
9321
9322          // Doctype:
9323          var doctypeMatch = html.match(doctype);
9324          if (doctypeMatch) {
9325            advance(doctypeMatch[0].length);
9326            continue
9327          }
9328
9329          // End tag:
9330          var endTagMatch = html.match(endTag);
9331          if (endTagMatch) {
9332            var curIndex = index;
9333            advance(endTagMatch[0].length);
9334            parseEndTag(endTagMatch[1], curIndex, index);
9335            continue
9336          }
9337
9338          // Start tag:
9339          var startTagMatch = parseStartTag();
9340          if (startTagMatch) {
9341            handleStartTag(startTagMatch);
9342            if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {
9343              advance(1);
9344            }
9345            continue
9346          }
9347        }
9348
9349        var text = (void 0), rest = (void 0), next = (void 0);
9350        if (textEnd >= 0) {
9351          rest = html.slice(textEnd);
9352          while (
9353            !endTag.test(rest) &&
9354            !startTagOpen.test(rest) &&
9355            !comment.test(rest) &&
9356            !conditionalComment.test(rest)
9357          ) {
9358            // < in plain text, be forgiving and treat it as text
9359            next = rest.indexOf('<', 1);
9360            if (next < 0) { break }
9361            textEnd += next;
9362            rest = html.slice(textEnd);
9363          }
9364          text = html.substring(0, textEnd);
9365        }
9366
9367        if (textEnd < 0) {
9368          text = html;
9369        }
9370
9371        if (text) {
9372          advance(text.length);
9373        }
9374
9375        if (options.chars && text) {
9376          options.chars(text, index - text.length, index);
9377        }
9378      } else {
9379        var endTagLength = 0;
9380        var stackedTag = lastTag.toLowerCase();
9381        var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
9382        var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
9383          endTagLength = endTag.length;
9384          if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
9385            text = text
9386              .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
9387              .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
9388          }
9389          if (shouldIgnoreFirstNewline(stackedTag, text)) {
9390            text = text.slice(1);
9391          }
9392          if (options.chars) {
9393            options.chars(text);
9394          }
9395          return ''
9396        });
9397        index += html.length - rest$1.length;
9398        html = rest$1;
9399        parseEndTag(stackedTag, index - endTagLength, index);
9400      }
9401
9402      if (html === last) {
9403        options.chars && options.chars(html);
9404        if (!stack.length && options.warn) {
9405          options.warn(("Mal-formatted tag at end of template: \"" + html + "\""), { start: index + html.length });
9406        }
9407        break
9408      }
9409    }
9410
9411    // Clean up any remaining tags
9412    parseEndTag();
9413
9414    function advance (n) {
9415      index += n;
9416      html = html.substring(n);
9417    }
9418
9419    function parseStartTag () {
9420      var start = html.match(startTagOpen);
9421      if (start) {
9422        var match = {
9423          tagName: start[1],
9424          attrs: [],
9425          start: index
9426        };
9427        advance(start[0].length);
9428        var end, attr;
9429        while (!(end = html.match(startTagClose)) && (attr = html.match(dynamicArgAttribute) || html.match(attribute))) {
9430          attr.start = index;
9431          advance(attr[0].length);
9432          attr.end = index;
9433          match.attrs.push(attr);
9434        }
9435        if (end) {
9436          match.unarySlash = end[1];
9437          advance(end[0].length);
9438          match.end = index;
9439          return match
9440        }
9441      }
9442    }
9443
9444    function handleStartTag (match) {
9445      var tagName = match.tagName;
9446      var unarySlash = match.unarySlash;
9447
9448      if (expectHTML) {
9449        if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
9450          parseEndTag(lastTag);
9451        }
9452        if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
9453          parseEndTag(tagName);
9454        }
9455      }
9456
9457      var unary = isUnaryTag$$1(tagName) || !!unarySlash;
9458
9459      var l = match.attrs.length;
9460      var attrs = new Array(l);
9461      for (var i = 0; i < l; i++) {
9462        var args = match.attrs[i];

9463        var value = args[3] || args[4] || args[5] || '';
9464        var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
9465          ? options.shouldDecodeNewlinesForHref
9466          : options.shouldDecodeNewlines;
9467        attrs[i] = {
9468          name: args[1],
9469          value: decodeAttr(value, shouldDecodeNewlines)
9470        };
9471        if (options.outputSourceRange) {
9472          attrs[i].start = args.start + args[0].match(/^\s*/).length;
9473          attrs[i].end = args.end;
9474        }
9475      }
9476
9477      if (!unary) {
9478        stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs, start: match.start, end: match.end });
9479        lastTag = tagName;
9480      }
9481
9482      if (options.start) {
9483        options.start(tagName, attrs, unary, match.start, match.end);
9484      }
9485    }
9486
9487    function parseEndTag (tagName, start, end) {
9488      var pos, lowerCasedTagName;
9489      if (start == null) { start = index; }
9490      if (end == null) { end = index; }
9491
9492      // Find the closest opened tag of the same type
9493      if (tagName) {
9494        lowerCasedTagName = tagName.toLowerCase();
9495        for (pos = stack.length - 1; pos >= 0; pos--) {
9496          if (stack[pos].lowerCasedTag === lowerCasedTagName) {
9497            break
9498          }
9499        }
9500      } else {
9501        // If no tag name is provided, clean shop
9502        pos = 0;
9503      }
9504
9505      if (pos >= 0) {
9506        // Close all the open elements, up the stack
9507        for (var i = stack.length - 1; i >= pos; i--) {
9508          if (i > pos || !tagName &&
9509            options.warn
9510          ) {
9511            options.warn(
9512              ("tag <" + (stack[i].tag) + "> has no matching end tag."),
9513              { start: stack[i].start, end: stack[i].end }
9514            );
9515          }
9516          if (options.end) {
9517            options.end(stack[i].tag, start, end);
9518          }
9519        }
9520
9521        // Remove the open elements from the stack
9522        stack.length = pos;
9523        lastTag = pos && stack[pos - 1].tag;
9524      } else if (lowerCasedTagName === 'br') {
9525        if (options.start) {
9526          options.start(tagName, [], true, start, end);
9527        }
9528      } else if (lowerCasedTagName === 'p') {
9529        if (options.start) {
9530          options.start(tagName, [], false, start, end);
9531        }
9532        if (options.end) {
9533          options.end(tagName, start, end);
9534        }
9535      }
9536    }
9537  }
9538
9539  /*  */
9540
9541  var onRE = /^@|^v-on:/;
9542  var dirRE = /^v-|^@|^:|^#/;
9543  var forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
9544  var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
9545  var stripParensRE = /^\(|\)$/g;
9546  var dynamicArgRE = /^\[.*\]$/;
9547
9548  var argRE = /:(.*)$/;
9549  var bindRE = /^:|^\.|^v-bind:/;
9550  var modifierRE = /\.[^.\]]+(?=[^\]]*$)/g;
9551
9552  var slotRE = /^v-slot(:|$)|^#/;
9553
9554  var lineBreakRE = /[\r\n]/;
9555  var whitespaceRE$1 = /\s+/g;
9556
9557  var invalidAttributeRE = /[\s"'<>\/=]/;
9558
9559  var decodeHTMLCached = cached(he.decode);
9560
9561  var emptySlotScopeToken = "_empty_";
9562
9563  // configurable state
9564  var warn$2;
9565  var delimiters;
9566  var transforms;
9567  var preTransforms;

9568  var postTransforms;
9569  var platformIsPreTag;
9570  var platformMustUseProp;
9571  var platformGetTagNamespace;
9572  var maybeComponent;
9573
9574  function createASTElement (
9575    tag,
9576    attrs,
9577    parent
9578  ) {
9579    return {
9580      type: 1,
9581      tag: tag,
9582      attrsList: attrs,
9583      attrsMap: makeAttrsMap(attrs),
9584      rawAttrsMap: {},
9585      parent: parent,
9586      children: []
9587    }
9588  }
9589
9590  /**
9591   * Convert HTML string to AST.
9592   */
9593  function parse (
9594    template,
9595    options
9596  ) {
9597    warn$2 = options.warn || baseWarn;
9598
9599    platformIsPreTag = options.isPreTag || no;
9600    platformMustUseProp = options.mustUseProp || no;
9601    platformGetTagNamespace = options.getTagNamespace || no;
9602    var isReservedTag = options.isReservedTag || no;
9603    maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
9604
9605    transforms = pluckModuleFunction(options.modules, 'transformNode');
9606    preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
9607    postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
9608
9609    delimiters = options.delimiters;
9610
9611    var stack = [];
9612    var preserveWhitespace = options.preserveWhitespace !== false;
9613    var whitespaceOption = options.whitespace;
9614    var root;
9615    var currentParent;
9616    var inVPre = false;
9617    var inPre = false;
9618    var warned = false;
9619
9620    function warnOnce (msg, range) {
9621      if (!warned) {
9622        warned = true;
9623        warn$2(msg, range);
9624      }
9625    }
9626
9627    function closeElement (element) {
9628      trimEndingWhitespace(element);
9629      if (!inVPre && !element.processed) {
9630        element = processElement(element, options);
9631      }
9632      // tree management
9633      if (!stack.length && element !== root) {
9634        // allow root elements with v-if, v-else-if and v-else
9635        if (root.if && (element.elseif || element.else)) {
9636          {
9637            checkRootConstraints(element);
9638          }
9639          addIfCondition(root, {
9640            exp: element.elseif,
9641            block: element
9642          });
9643        } else {
9644          warnOnce(
9645            "Component template should contain exactly one root element. " +
9646            "If you are using v-if on multiple elements, " +
9647            "use v-else-if to chain them instead.",
9648            { start: element.start }
9649          );
9650        }
9651      }
9652      if (currentParent && !element.forbidden) {
9653        if (element.elseif || element.else) {
9654          processIfConditions(element, currentParent);
9655        } else {
9656          if (element.slotScope) {
9657            // scoped slot
9658            // keep it in the children list so that v-else(-if) conditions can
9659            // find it as the prev node.
9660            var name = element.slotTarget || '"default"'
9661            ;(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
9662          }
9663          currentParent.children.push(element);
9664          element.parent = currentParent;
9665        }
9666      }
9667
9668      // final children cleanup
9669      // filter out scoped slots
9670      element.children = element.children.filter(function (c) { return !(c).slotScope; });
9671      // remove trailing whitespace node again
9672      trimEndingWhitespace(element);
9673
9674      // check pre state
9675      if (element.pre) {
9676        inVPre = false;
9677      }
9678      if (platformIsPreTag(element.tag)) {
9679        inPre = false;
9680      }
9681      // apply post-transforms
9682      for (var i = 0; i < postTransforms.length; i++) {
9683        postTransforms[i](element, options);
9684      }
9685    }
9686
9687    function trimEndingWhitespace (el) {
9688      // remove trailing whitespace node
9689      if (!inPre) {
9690        var lastNode;
9691        while (
9692          (lastNode = el.children[el.children.length - 1]) &&
9693          lastNode.type === 3 &&
9694          lastNode.text === ' '
9695        ) {
9696          el.children.pop();
9697        }
9698      }
9699    }
9700
9701    function checkRootConstraints (el) {
9702      if (el.tag === 'slot' || el.tag === 'template') {
9703        warnOnce(
9704          "Cannot use <" + (el.tag) + "> as component root element because it may " +
9705          'contain multiple nodes.',

9706          { start: el.start }
9707        );
9708      }
9709      if (el.attrsMap.hasOwnProperty('v-for')) {
9710        warnOnce(
9711          'Cannot use v-for on stateful component root element because ' +
9712          'it renders multiple elements.',
9713          el.rawAttrsMap['v-for']
9714        );
9715      }
9716    }
9717
9718    parseHTML(template, {
9719      warn: warn$2,
9720      expectHTML: options.expectHTML,
9721      isUnaryTag: options.isUnaryTag,
9722      canBeLeftOpenTag: options.canBeLeftOpenTag,
9723      shouldDecodeNewlines: options.shouldDecodeNewlines,
9724      shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
9725      shouldKeepComment: options.comments,
9726      outputSourceRange: options.outputSourceRange,
9727      start: function start (tag, attrs, unary, start$1, end) {
9728        // check namespace.
9729        // inherit parent ns if there is one
9730        var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);
9731
9732        // handle IE svg bug
9733        /* istanbul ignore if */
9734        if (isIE && ns === 'svg') {
9735          attrs = guardIESVGBug(attrs);
9736        }
9737
9738        var element = createASTElement(tag, attrs, currentParent);
9739        if (ns) {
9740          element.ns = ns;
9741        }
9742
9743        {
9744          if (options.outputSourceRange) {
9745            element.start = start$1;
9746            element.end = end;
9747            element.rawAttrsMap = element.attrsList.reduce(function (cumulated, attr) {
9748              cumulated[attr.name] = attr;
9749              return cumulated
9750            }, {});
9751          }
9752          attrs.forEach(function (attr) {
9753            if (invalidAttributeRE.test(attr.name)) {
9754              warn$2(
9755                "Invalid dynamic argument expression: attribute names cannot contain " +
9756                "spaces, quotes, <, >, / or =.",
9757                {
9758                  start: attr.start + attr.name.indexOf("["),
9759                  end: attr.start + attr.name.length
9760                }
9761              );
9762            }
9763          });
9764        }
9765
9766        if (isForbiddenTag(element) && !isServerRendering()) {
9767          element.forbidden = true;
9768          warn$2(
9769            'Templates should only be responsible for mapping the state to the ' +
9770            'UI. Avoid placing tags with side-effects in your templates, such as ' +
9771            "<" + tag + ">" + ', as they will not be parsed.',
9772            { start: element.start }
9773          );
9774        }
9775
9776        // apply pre-transforms
9777        for (var i = 0; i < preTransforms.length; i++) {
9778          element = preTransforms[i](element, options) || element;
9779        }
9780
9781        if (!inVPre) {
9782          processPre(element);
9783          if (element.pre) {
9784            inVPre = true;
9785          }
9786        }
9787        if (platformIsPreTag(element.tag)) {
9788          inPre = true;
9789        }
9790        if (inVPre) {
9791          processRawAttrs(element);
9792        } else if (!element.processed) {
9793          // structural directives
9794          processFor(element);
9795          processIf(element);
9796          processOnce(element);
9797        }
9798
9799        if (!root) {
9800          root = element;
9801          {
9802            checkRootConstraints(root);
9803          }
9804        }
9805
9806        if (!unary) {
9807          currentParent = element;
9808          stack.push(element);
9809        } else {
9810          closeElement(element);
9811        }
9812      },
9813
9814      end: function end (tag, start, end$1) {
9815        var element = stack[stack.length - 1];
9816        // pop stack
9817        stack.length -= 1;
9818        currentParent = stack[stack.length - 1];
9819        if (options.outputSourceRange) {
9820          element.end = end$1;
9821        }
9822        closeElement(element);
9823      },
9824
9825      chars: function chars (text, start, end) {
9826        if (!currentParent) {
9827          {
9828            if (text === template) {
9829              warnOnce(
9830                'Component template requires a root element, rather than just text.',
9831                { start: start }
9832              );
9833            } else if ((text = text.trim())) {
9834              warnOnce(

9835                ("text \"" + text + "\" outside root element will be ignored."),
9836                { start: start }
9837              );
9838            }
9839          }
9840          return
9841        }
9842        // IE textarea placeholder bug
9843        /* istanbul ignore if */
9844        if (isIE &&
9845          currentParent.tag === 'textarea' &&
9846          currentParent.attrsMap.placeholder === text
9847        ) {
9848          return
9849        }
9850        var children = currentParent.children;
9851        if (inPre || text.trim()) {
9852          text = isTextTag(currentParent) ? text : decodeHTMLCached(text);
9853        } else if (!children.length) {
9854          // remove the whitespace-only node right after an opening tag
9855          text = '';
9856        } else if (whitespaceOption) {
9857          if (whitespaceOption === 'condense') {
9858            // in condense mode, remove the whitespace node if it contains
9859            // line break, otherwise condense to a single space
9860            text = lineBreakRE.test(text) ? '' : ' ';
9861          } else {
9862            text = ' ';
9863          }
9864        } else {
9865          text = preserveWhitespace ? ' ' : '';
9866        }
9867        if (text) {
9868          if (!inPre && whitespaceOption === 'condense') {
9869            // condense consecutive whitespaces into single space
9870            text = text.replace(whitespaceRE$1, ' ');
9871          }
9872          var res;
9873          var child;
9874          if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
9875            child = {
9876              type: 2,
9877              expression: res.expression,
9878              tokens: res.tokens,
9879              text: text
9880            };
9881          } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
9882            child = {
9883              type: 3,
9884              text: text
9885            };
9886          }
9887          if (child) {
9888            if (options.outputSourceRange) {
9889              child.start = start;
9890              child.end = end;
9891            }
9892            children.push(child);
9893          }
9894        }
9895      },
9896      comment: function comment (text, start, end) {
9897        // adding anyting as a sibling to the root node is forbidden
9898        // comments should still be allowed, but ignored
9899        if (currentParent) {
9900          var child = {
9901            type: 3,
9902            text: text,
9903            isComment: true
9904          };
9905          if (options.outputSourceRange) {
9906            child.start = start;
9907            child.end = end;
9908          }
9909          currentParent.children.push(child);
9910        }
9911      }
9912    });
9913    return root
9914  }
9915
9916  function processPre (el) {
9917    if (getAndRemoveAttr(el, 'v-pre') != null) {
9918      el.pre = true;
9919    }
9920  }
9921
9922  function processRawAttrs (el) {
9923    var list = el.attrsList;
9924    var len = list.length;
9925    if (len) {
9926      var attrs = el.attrs = new Array(len);
9927      for (var i = 0; i < len; i++) {
9928        attrs[i] = {
9929          name: list[i].name,
9930          value: JSON.stringify(list[i].value)
9931        };
9932        if (list[i].start != null) {
9933          attrs[i].start = list[i].start;
9934          attrs[i].end = list[i].end;
9935        }
9936      }
9937    } else if (!el.pre) {
9938      // non root node in pre blocks with no attributes
9939      el.plain = true;
9940    }
9941  }
9942
9943  function processElement (
9944    element,
9945    options
9946  ) {
9947    processKey(element);
9948
9949    // determine whether this is a plain element after
9950    // removing structural attributes
9951    element.plain = (
9952      !element.key &&
9953      !element.scopedSlots &&
9954      !element.attrsList.length
9955    );
9956
9957    processRef(element);
9958    processSlotContent(element);
9959    processSlotOutlet(element);
9960    processComponent(element);
9961    for (var i = 0; i < transforms.length; i++) {
9962      element = transforms[i](element, options) || element;
9963    }
9964    processAttrs(element);
9965    return element
9966  }
9967
9968  function processKey (el) {
9969    var exp = getBindingAttr(el, 'key');
9970    if (exp) {
9971      {
9972        if (el.tag === 'template') {
9973          warn$2(
9974            "<template> cannot be keyed. Place the key on real elements instead.",
9975            getRawBindingAttr(el, 'key')
9976          );
9977        }
9978        if (el.for) {
9979          var iterator = el.iterator2 || el.iterator1;
9980          var parent = el.parent;
9981          if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
9982            warn$2(
9983              "Do not use v-for index as key on <transition-group> children, " +
9984              "this is the same as not using keys.",
9985              getRawBindingAttr(el, 'key'),
9986              true /* tip */
9987            );
9988          }
9989        }
9990      }
9991      el.key = exp;
9992    }
9993  }
9994
9995  function processRef (el) {
9996    var ref = getBindingAttr(el, 'ref');
9997    if (ref) {
9998      el.ref = ref;
9999      el.refInFor = checkInFor(el);
10000    }
10001  }
10002

10003  function processFor (el) {
10004    var exp;
10005    if ((exp = getAndRemoveAttr(el, 'v-for'))) {
10006      var res = parseFor(exp);
10007      if (res) {
10008        extend(el, res);
10009      } else {
10010        warn$2(
10011          ("Invalid v-for expression: " + exp),
10012          el.rawAttrsMap['v-for']
10013        );
10014      }
10015    }
10016  }
10017
10018
10019
10020  function parseFor (exp) {
10021    var inMatch = exp.match(forAliasRE);
10022    if (!inMatch) { return }
10023    var res = {};
10024    res.for = inMatch[2].trim();
10025    var alias = inMatch[1].trim().replace(stripParensRE, '');
10026    var iteratorMatch = alias.match(forIteratorRE);
10027    if (iteratorMatch) {
10028      res.alias = alias.replace(forIteratorRE, '').trim();
10029      res.iterator1 = iteratorMatch[1].trim();
10030      if (iteratorMatch[2]) {
10031        res.iterator2 = iteratorMatch[2].trim();
10032      }
10033    } else {
10034      res.alias = alias;
10035    }
10036    return res
10037  }
10038
10039  function processIf (el) {
10040    var exp = getAndRemoveAttr(el, 'v-if');
10041    if (exp) {
10042      el.if = exp;
10043      addIfCondition(el, {
10044        exp: exp,
10045        block: el
10046      });
10047    } else {
10048      if (getAndRemoveAttr(el, 'v-else') != null) {
10049        el.else = true;
10050      }
10051      var elseif = getAndRemoveAttr(el, 'v-else-if');
10052      if (elseif) {
10053        el.elseif = elseif;
10054      }
10055    }
10056  }
10057
10058  function processIfConditions (el, parent) {
10059    var prev = findPrevElement(parent.children);
10060    if (prev && prev.if) {
10061      addIfCondition(prev, {
10062        exp: el.elseif,
10063        block: el
10064      });
10065    } else {
10066      warn$2(
10067        "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
10068        "used on element <" + (el.tag) + "> without corresponding v-if.",
10069        el.rawAttrsMap[el.elseif ? 'v-else-if' : 'v-else']
10070      );
10071    }
10072  }
10073
10074  function findPrevElement (children) {
10075    var i = children.length;
10076    while (i--) {
10077      if (children[i].type === 1) {
10078        return children[i]
10079      } else {
10080        if (children[i].text !== ' ') {
10081          warn$2(
10082            "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
10083            "will be ignored.",
10084            children[i]
10085          );
10086        }
10087        children.pop();
10088      }
10089    }
10090  }
10091
10092  function addIfCondition (el, condition) {
10093    if (!el.ifConditions) {
10094      el.ifConditions = [];
10095    }
10096    el.ifConditions.push(condition);
10097  }
10098
10099  function processOnce (el) {
10100    var once$$1 = getAndRemoveAttr(el, 'v-once');
10101    if (once$$1 != null) {
10102      el.once = true;
10103    }
10104  }
10105
10106  // handle content being passed to a component as slot,
10107  // e.g. <template slot="xxx">, <div slot-scope="xxx">
10108  function processSlotContent (el) {
10109    var slotScope;
10110    if (el.tag === 'template') {
10111      slotScope = getAndRemoveAttr(el, 'scope');
10112      /* istanbul ignore if */
10113      if (slotScope) {
10114        warn$2(
10115          "the \"scope\" attribute for scoped slots have been deprecated and " +
10116          "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
10117          "can also be used on plain elements in addition to <template> to " +
10118          "denote scoped slots.",
10119          el.rawAttrsMap['scope'],
10120          true
10121        );
10122      }
10123      el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
10124    } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
10125      /* istanbul ignore if */
10126      if (el.attrsMap['v-for']) {
10127        warn$2(
10128          "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
10129          "(v-for takes higher priority). Use a wrapper <template> for the " +
10130          "scoped slot to make it clearer.",
10131          el.rawAttrsMap['slot-scope'],
10132          true
10133        );
10134      }
10135      el.slotScope = slotScope;
10136    }
10137
10138    // slot="xxx"
10139    var slotTarget = getBindingAttr(el, 'slot');
10140    if (slotTarget) {
10141      el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
10142      el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
10143      // preserve slot as an attribute for native shadow DOM compat
10144      // only for non-scoped slots.
10145      if (el.tag !== 'template' && !el.slotScope) {
10146        addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
10147      }
10148    }
10149
10150    // 2.6 v-slot syntax
10151    {
10152      if (el.tag === 'template') {
10153        // v-slot on <template>
10154        var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
10155        if (slotBinding) {
10156          {
10157            if (el.slotTarget || el.slotScope) {
10158              warn$2(
10159                "Unexpected mixed usage of different slot syntaxes.",
10160                el
10161              );
10162            }
10163            if (el.parent && !maybeComponent(el.parent)) {
10164              warn$2(
10165                "<template v-slot> can only appear at the root level inside " +
10166                "the receiving component",
10167                el
10168              );
10169            }
10170          }
10171          var ref = getSlotName(slotBinding);
10172          var name = ref.name;
10173          var dynamic = ref.dynamic;
10174          el.slotTarget = name;
10175          el.slotTargetDynamic = dynamic;
10176          el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
10177        }
10178      } else {
10179        // v-slot on component, denotes default slot
10180        var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
10181        if (slotBinding$1) {
10182          {
10183            if (!maybeComponent(el)) {
10184              warn$2(
10185                "v-slot can only be used on components or <template>.",

10186                slotBinding$1
10187              );
10188            }
10189            if (el.slotScope || el.slotTarget) {
10190              warn$2(
10191                "Unexpected mixed usage of different slot syntaxes.",
10192                el
10193              );
10194            }
10195            if (el.scopedSlots) {
10196              warn$2(
10197                "To avoid scope ambiguity, the default slot should also use " +
10198                "<template> syntax when there are other named slots.",
10199                slotBinding$1
10200              );
10201            }
10202          }
10203          // add the component's children to its default slot
10204          var slots = el.scopedSlots || (el.scopedSlots = {});
10205          var ref$1 = getSlotName(slotBinding$1);
10206          var name$1 = ref$1.name;
10207          var dynamic$1 = ref$1.dynamic;
10208          var slotContainer = slots[name$1] = createASTElement('template', [], el);
10209          slotContainer.slotTarget = name$1;
10210          slotContainer.slotTargetDynamic = dynamic$1;
10211          slotContainer.children = el.children.filter(function (c) {
10212            if (!c.slotScope) {
10213              c.parent = slotContainer;
10214              return true
10215            }
10216          });
10217          slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
10218          // remove children as they are returned from scopedSlots now
10219          el.children = [];
10220          // mark el non-plain so data gets generated
10221          el.plain = false;
10222        }
10223      }
10224    }
10225  }
10226
10227  function getSlotName (binding) {
10228    var name = binding.name.replace(slotRE, '');
10229    if (!name) {
10230      if (binding.name[0] !== '#') {
10231        name = 'default';
10232      } else {
10233        warn$2(
10234          "v-slot shorthand syntax requires a slot name.",
10235          binding
10236        );
10237      }
10238    }
10239    return dynamicArgRE.test(name)
10240      // dynamic [name]
10241      ? { name: name.slice(1, -1), dynamic: true }
10242      // static name
10243      : { name: ("\"" + name + "\""), dynamic: false }
10244  }
10245
10246  // handle <slot/> outlets
10247  function processSlotOutlet (el) {
10248    if (el.tag === 'slot') {
10249      el.slotName = getBindingAttr(el, 'name');
10250      if (el.key) {
10251        warn$2(
10252          "`key` does not work on <slot> because slots are abstract outlets " +
10253          "and can possibly expand into multiple elements. " +
10254          "Use the key on a wrapping element instead.",
10255          getRawBindingAttr(el, 'key')
10256        );
10257      }
10258    }
10259  }
10260
10261  function processComponent (el) {
10262    var binding;
10263    if ((binding = getBindingAttr(el, 'is'))) {
10264      el.component = binding;
10265    }
10266    if (getAndRemoveAttr(el, 'inline-template') != null) {
10267      el.inlineTemplate = true;
10268    }
10269  }
10270
10271  function processAttrs (el) {
10272    var list = el.attrsList;
10273    var i, l, name, rawName, value, modifiers, syncGen, isDynamic;
10274    for (i = 0, l = list.length; i < l; i++) {
10275      name = rawName = list[i].name;
10276      value = list[i].value;
10277      if (dirRE.test(name)) {
10278        // mark element as dynamic
10279        el.hasBindings = true;
10280        // modifiers
10281        modifiers = parseModifiers(name.replace(dirRE, ''));
10282        // support .foo shorthand syntax for the .prop modifier
10283        if (modifiers) {
10284          name = name.replace(modifierRE, '');
10285        }
10286        if (bindRE.test(name)) { // v-bind
10287          name = name.replace(bindRE, '');
10288          value = parseFilters(value);
10289          isDynamic = dynamicArgRE.test(name);
10290          if (isDynamic) {
10291            name = name.slice(1, -1);
10292          }
10293          if (
10294            value.trim().length === 0
10295          ) {
10296            warn$2(
10297              ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\"")
10298            );
10299          }
10300          if (modifiers) {
10301            if (modifiers.prop && !isDynamic) {
10302              name = camelize(name);
10303              if (name === 'innerHtml') { name = 'innerHTML'; }
10304            }
10305            if (modifiers.camel && !isDynamic) {
10306              name = camelize(name);
10307            }
10308            if (modifiers.sync) {

10309              syncGen = genAssignmentCode(value, "$event");
10310              if (!isDynamic) {
10311                addHandler(
10312                  el,
10313                  ("update:" + (camelize(name))),
10314                  syncGen,
10315                  null,
10316                  false,
10317                  warn$2,
10318                  list[i]
10319                );
10320                if (hyphenate(name) !== camelize(name)) {
10321                  addHandler(
10322                    el,
10323                    ("update:" + (hyphenate(name))),
10324                    syncGen,
10325                    null,
10326                    false,
10327                    warn$2,
10328                    list[i]
10329                  );
10330                }
10331              } else {
10332                // handler w/ dynamic event name
10333                addHandler(
10334                  el,
10335                  ("\"update:\"+(" + name + ")"),
10336                  syncGen,
10337                  null,
10338                  false,
10339                  warn$2,
10340                  list[i],
10341                  true // dynamic
10342                );
10343              }
10344            }
10345          }
10346          if ((modifiers && modifiers.prop) || (
10347            !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
10348          )) {
10349            addProp(el, name, value, list[i], isDynamic);
10350          } else {
10351            addAttr(el, name, value, list[i], isDynamic);
10352          }
10353        } else if (onRE.test(name)) { // v-on
10354          name = name.replace(onRE, '');
10355          isDynamic = dynamicArgRE.test(name);
10356          if (isDynamic) {
10357            name = name.slice(1, -1);
10358          }
10359          addHandler(el, name, value, modifiers, false, warn$2, list[i], isDynamic);
10360        } else { // normal directives
10361          name = name.replace(dirRE, '');
10362          // parse arg
10363          var argMatch = name.match(argRE);
10364          var arg = argMatch && argMatch[1];
10365          isDynamic = false;
10366          if (arg) {
10367            name = name.slice(0, -(arg.length + 1));
10368            if (dynamicArgRE.test(arg)) {
10369              arg = arg.slice(1, -1);
10370              isDynamic = true;
10371            }
10372          }
10373          addDirective(el, name, rawName, value, arg, isDynamic, modifiers, list[i]);
10374          if (name === 'model') {
10375            checkForAliasModel(el, value);
10376          }
10377        }
10378      } else {
10379        // literal attribute
10380        {
10381          var res = parseText(value, delimiters);
10382          if (res) {
10383            warn$2(
10384              name + "=\"" + value + "\": " +
10385              'Interpolation inside attributes has been removed. ' +
10386              'Use v-bind or the colon shorthand instead. For example, ' +
10387              'instead of <div id="{{ val }}">, use <div :id="val">.',
10388              list[i]
10389            );
10390          }
10391        }
10392        addAttr(el, name, JSON.stringify(value), list[i]);
10393        // #6887 firefox doesn't update muted state if set via attribute
10394        // even immediately after element creation
10395        if (!el.component &&
10396            name === 'muted' &&
10397            platformMustUseProp(el.tag, el.attrsMap.type, name)) {
10398          addProp(el, name, 'true', list[i]);
10399        }
10400      }
10401    }
10402  }
10403
10404  function checkInFor (el) {
10405    var parent = el;
10406    while (parent) {
10407      if (parent.for !== undefined) {
10408        return true
10409      }
10410      parent = parent.parent;
10411    }
10412    return false
10413  }
10414
10415  function parseModifiers (name) {
10416    var match = name.match(modifierRE);
10417    if (match) {
10418      var ret = {};
10419      match.forEach(function (m) { ret[m.slice(1)] = true; });
10420      return ret
10421    }
10422  }
10423
10424  function makeAttrsMap (attrs) {
10425    var map = {};
10426    for (var i = 0, l = attrs.length; i < l; i++) {
10427      if (
10428        map[attrs[i].name] && !isIE && !isEdge
10429      ) {
10430        warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
10431      }
10432      map[attrs[i].name] = attrs[i].value;
10433    }
10434    return map
10435  }
10436
10437  // for script (e.g. type="x/template") or style, do not decode content
10438  function isTextTag (el) {
10439    return el.tag === 'script' || el.tag === 'style'
10440  }
10441
10442  function isForbiddenTag (el) {
10443    return (
10444      el.tag === 'style' ||
10445      (el.tag === 'script' && (
10446        !el.attrsMap.type ||
10447        el.attrsMap.type === 'text/javascript'
10448      ))
10449    )
10450  }
10451
10452  var ieNSBug = /^xmlns:NS\d+/;
10453  var ieNSPrefix = /^NS\d+:/;
10454
10455  /* istanbul ignore next */
10456  function guardIESVGBug (attrs) {
10457    var res = [];
10458    for (var i = 0; i < attrs.length; i++) {
10459      var attr = attrs[i];

10460      if (!ieNSBug.test(attr.name)) {
10461        attr.name = attr.name.replace(ieNSPrefix, '');
10462        res.push(attr);
10463      }
10464    }
10465    return res
10466  }
10467
10468  function checkForAliasModel (el, value) {
10469    var _el = el;
10470    while (_el) {
10471      if (_el.for && _el.alias === value) {
10472        warn$2(
10473          "<" + (el.tag) + " v-model=\"" + value + "\">: " +
10474          "You are binding v-model directly to a v-for iteration alias. " +
10475          "This will not be able to modify the v-for source array because " +
10476          "writing to the alias is like modifying a function local variable. " +
10477          "Consider using an array of objects and use v-model on an object property instead.",
10478          el.rawAttrsMap['v-model']
10479        );
10480      }
10481      _el = _el.parent;
10482    }
10483  }
10484
10485  /*  */
10486
10487  function preTransformNode (el, options) {
10488    if (el.tag === 'input') {
10489      var map = el.attrsMap;
10490      if (!map['v-model']) {
10491        return
10492      }
10493
10494      var typeBinding;
10495      if (map[':type'] || map['v-bind:type']) {
10496        typeBinding = getBindingAttr(el, 'type');
10497      }
10498      if (!map.type && !typeBinding && map['v-bind']) {
10499        typeBinding = "(" + (map['v-bind']) + ").type";
10500      }
10501
10502      if (typeBinding) {
10503        var ifCondition = getAndRemoveAttr(el, 'v-if', true);
10504        var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
10505        var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
10506        var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
10507        // 1. checkbox
10508        var branch0 = cloneASTElement(el);
10509        // process for on the main node
10510        processFor(branch0);
10511        addRawAttr(branch0, 'type', 'checkbox');
10512        processElement(branch0, options);
10513        branch0.processed = true; // prevent it from double-processed
10514        branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
10515        addIfCondition(branch0, {
10516          exp: branch0.if,
10517          block: branch0
10518        });
10519        // 2. add radio else-if condition
10520        var branch1 = cloneASTElement(el);
10521        getAndRemoveAttr(branch1, 'v-for', true);
10522        addRawAttr(branch1, 'type', 'radio');
10523        processElement(branch1, options);
10524        addIfCondition(branch0, {
10525          exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
10526          block: branch1
10527        });
10528        // 3. other
10529        var branch2 = cloneASTElement(el);
10530        getAndRemoveAttr(branch2, 'v-for', true);
10531        addRawAttr(branch2, ':type', typeBinding);
10532        processElement(branch2, options);
10533        addIfCondition(branch0, {
10534          exp: ifCondition,
10535          block: branch2
10536        });
10537
10538        if (hasElse) {
10539          branch0.else = true;
10540        } else if (elseIfCondition) {
10541          branch0.elseif = elseIfCondition;
10542        }
10543
10544        return branch0
10545      }
10546    }
10547  }
10548
10549  function cloneASTElement (el) {
10550    return createASTElement(el.tag, el.attrsList.slice(), el.parent)
10551  }
10552
10553  var model$1 = {
10554    preTransformNode: preTransformNode
10555  };
10556
10557  var modules$1 = [
10558    klass$1,
10559    style$1,
10560    model$1
10561  ];
10562
10563  /*  */
10564
10565  function text (el, dir) {
10566    if (dir.value) {
10567      addProp(el, 'textContent', ("_s(" + (dir.value) + ")"), dir);
10568    }
10569  }
10570
10571  /*  */
10572
10573  function html (el, dir) {
10574    if (dir.value) {
10575      addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"), dir);
10576    }
10577  }
10578
10579  var directives$1 = {
10580    model: model,
10581    text: text,
10582    html: html
10583  };
10584
10585  /*  */
10586
10587  var baseOptions = {
10588    expectHTML: true,
10589    modules: modules$1,
10590    directives: directives$1,
10591    isPreTag: isPreTag,
10592    isUnaryTag: isUnaryTag,
10593    mustUseProp: mustUseProp,
10594    canBeLeftOpenTag: canBeLeftOpenTag,
10595    isReservedTag: isReservedTag,
10596    getTagNamespace: getTagNamespace,
10597    staticKeys: genStaticKeys(modules$1)
10598  };
10599
10600  /*  */
10601
10602  var isStaticKey;
10603  var isPlatformReservedTag;
10604
10605  var genStaticKeysCached = cached(genStaticKeys$1);
10606
10607  /**
10608   * Goal of the optimizer: walk the generated template AST tree
10609   * and detect sub-trees that are purely static, i.e. parts of
10610   * the DOM that never needs to change.
10611   *
10612   * Once we detect these sub-trees, we can:
10613   *
10614   * 1. Hoist them into constants, so that we no longer need to
10615   *    create fresh nodes for them on each re-render;
10616   * 2. Completely skip them in the patching process.
10617   */
10618  function optimize (root, options) {
10619    if (!root) { return }
10620    isStaticKey = genStaticKeysCached(options.staticKeys || '');
10621    isPlatformReservedTag = options.isReservedTag || no;

10622    // first pass: mark all non-static nodes.
10623    markStatic$1(root);
10624    // second pass: mark static roots.
10625    markStaticRoots(root, false);
10626  }
10627
10628  function genStaticKeys$1 (keys) {
10629    return makeMap(
10630      'type,tag,attrsList,attrsMap,plain,parent,children,attrs,start,end,rawAttrsMap' +
10631      (keys ? ',' + keys : '')
10632    )
10633  }
10634
10635  function markStatic$1 (node) {
10636    node.static = isStatic(node);
10637    if (node.type === 1) {
10638      // do not make component slot content static. this avoids
10639      // 1. components not able to mutate slot nodes
10640      // 2. static slot content fails for hot-reloading
10641      if (
10642        !isPlatformReservedTag(node.tag) &&
10643        node.tag !== 'slot' &&
10644        node.attrsMap['inline-template'] == null
10645      ) {
10646        return
10647      }
10648      for (var i = 0, l = node.children.length; i < l; i++) {
10649        var child = node.children[i];
10650        markStatic$1(child);
10651        if (!child.static) {
10652          node.static = false;
10653        }
10654      }
10655      if (node.ifConditions) {
10656        for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
10657          var block = node.ifConditions[i$1].block;
10658          markStatic$1(block);
10659          if (!block.static) {
10660            node.static = false;
10661          }
10662        }
10663      }
10664    }
10665  }
10666
10667  function markStaticRoots (node, isInFor) {
10668    if (node.type === 1) {
10669      if (node.static || node.once) {
10670        node.staticInFor = isInFor;
10671      }
10672      // For a node to qualify as a static root, it should have children that
10673      // are not just static text. Otherwise the cost of hoisting out will
10674      // outweigh the benefits and it's better off to just always render it fresh.
10675      if (node.static && node.children.length && !(
10676        node.children.length === 1 &&
10677        node.children[0].type === 3
10678      )) {
10679        node.staticRoot = true;
10680        return
10681      } else {
10682        node.staticRoot = false;
10683      }
10684      if (node.children) {
10685        for (var i = 0, l = node.children.length; i < l; i++) {
10686          markStaticRoots(node.children[i], isInFor || !!node.for);
10687        }
10688      }
10689      if (node.ifConditions) {
10690        for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
10691          markStaticRoots(node.ifConditions[i$1].block, isInFor);
10692        }
10693      }
10694    }
10695  }
10696
10697  function isStatic (node) {
10698    if (node.type === 2) { // expression
10699      return false
10700    }
10701    if (node.type === 3) { // text
10702      return true
10703    }
10704    return !!(node.pre || (
10705      !node.hasBindings && // no dynamic bindings
10706      !node.if && !node.for && // not v-if or v-for or v-else
10707      !isBuiltInTag(node.tag) && // not a built-in
10708      isPlatformReservedTag(node.tag) && // not a component
10709      !isDirectChildOfTemplateFor(node) &&
10710      Object.keys(node).every(isStaticKey)
10711    ))
10712  }
10713
10714  function isDirectChildOfTemplateFor (node) {
10715    while (node.parent) {
10716      node = node.parent;
10717      if (node.tag !== 'template') {
10718        return false
10719      }
10720      if (node.for) {
10721        return true
10722      }
10723    }
10724    return false
10725  }
10726
10727  /*  */
10728
10729  var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function(?:\s+[\w$]+)?\s*\(/;
10730  var fnInvokeRE = /\([^)]*?\);*$/;
10731  var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;
10732
10733  // KeyboardEvent.keyCode aliases
10734  var keyCodes = {
10735    esc: 27,
10736    tab: 9,
10737    enter: 13,
10738    space: 32,
10739    up: 38,
10740    left: 37,
10741    right: 39,
10742    down: 40,
10743    'delete': [8, 46]
10744  };
10745
10746  // KeyboardEvent.key aliases
10747  var keyNames = {
10748    // #7880: IE11 and Edge use `Esc` for Escape key name.
10749    esc: ['Esc', 'Escape'],
10750    tab: 'Tab',
10751    enter: 'Enter',
10752    // #9112: IE11 uses `Spacebar` for Space key name.
10753    space: [' ', 'Spacebar'],
10754    // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
10755    up: ['Up', 'ArrowUp'],
10756    left: ['Left', 'ArrowLeft'],
10757    right: ['Right', 'ArrowRight'],
10758    down: ['Down', 'ArrowDown'],
10759    // #9112: IE11 uses `Del` for Delete key name.
10760    'delete': ['Backspace', 'Delete', 'Del']
10761  };
10762
10763  // #4868: modifiers that prevent the execution of the listener
10764  // need to explicitly return null so that we can determine whether to remove
10765  // the listener for .once
10766  var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };
10767
10768  var modifierCode = {
10769    stop: '$event.stopPropagation();',
10770    prevent: '$event.preventDefault();',
10771    self: genGuard("$event.target !== $event.currentTarget"),
10772    ctrl: genGuard("!$event.ctrlKey"),
10773    shift: genGuard("!$event.shiftKey"),
10774    alt: genGuard("!$event.altKey"),
10775    meta: genGuard("!$event.metaKey"),
10776    left: genGuard("'button' in $event && $event.button !== 0"),
10777    middle: genGuard("'button' in $event && $event.button !== 1"),
10778    right: genGuard("'button' in $event && $event.button !== 2")
10779  };
10780
10781  function genHandlers (
10782    events,
10783    isNative
10784  ) {
10785    var prefix = isNative ? 'nativeOn:' : 'on:';
10786    var staticHandlers = "";
10787    var dynamicHandlers = "";
10788    for (var name in events) {
10789      var handlerCode = genHandler(events[name]);
10790      if (events[name] && events[name].dynamic) {
10791        dynamicHandlers += name + "," + handlerCode + ",";
10792      } else {
10793        staticHandlers += "\"" + name + "\":" + handlerCode + ",";
10794      }
10795    }
10796    staticHandlers = "{" + (staticHandlers.slice(0, -1)) + "}";
10797    if (dynamicHandlers) {
10798      return prefix + "_d(" + staticHandlers + ",[" + (dynamicHandlers.slice(0, -1)) + "])"
10799    } else {
10800      return prefix + staticHandlers
10801    }
10802  }
10803
10804  function genHandler (handler) {
10805    if (!handler) {
10806      return 'function(){}'
10807    }
10808
10809    if (Array.isArray(handler)) {
10810      return ("[" + (handler.map(function (handler) { return genHandler(handler); }).join(',')) + "]")
10811    }
10812
10813    var isMethodPath = simplePathRE.test(handler.value);
10814    var isFunctionExpression = fnExpRE.test(handler.value);
10815    var isFunctionInvocation = simplePathRE.test(handler.value.replace(fnInvokeRE, ''));
10816
10817    if (!handler.modifiers) {
10818      if (isMethodPath || isFunctionExpression) {
10819        return handler.value
10820      }
10821      return ("function($event){" + (isFunctionInvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline statement
10822    } else {
10823      var code = '';
10824      var genModifierCode = '';
10825      var keys = [];
10826      for (var key in handler.modifiers) {
10827        if (modifierCode[key]) {
10828          genModifierCode += modifierCode[key];
10829          // left/right
10830          if (keyCodes[key]) {
10831            keys.push(key);
10832          }
10833        } else if (key === 'exact') {
10834          var modifiers = (handler.modifiers);
10835          genModifierCode += genGuard(
10836            ['ctrl', 'shift', 'alt', 'meta']
10837              .filter(function (keyModifier) { return !modifiers[keyModifier]; })
10838              .map(function (keyModifier) { return ("$event." + keyModifier + "Key"); })
10839              .join('||')
10840          );
10841        } else {
10842          keys.push(key);
10843        }
10844      }
10845      if (keys.length) {
10846        code += genKeyFilter(keys);
10847      }
10848      // Make sure modifiers like prevent and stop get executed after key filtering
10849      if (genModifierCode) {
10850        code += genModifierCode;
10851      }
10852      var handlerCode = isMethodPath
10853        ? ("return " + (handler.value) + "($event)")
10854        : isFunctionExpression
10855          ? ("return (" + (handler.value) + ")($event)")
10856          : isFunctionInvocation
10857            ? ("return " + (handler.value))
10858            : handler.value;
10859      return ("function($event){" + code + handlerCode + "}")
10860    }
10861  }
10862
10863  function genKeyFilter (keys) {
10864    return (
10865      // make sure the key filters only apply to KeyboardEvents
10866      // #9441: can't use 'keyCode' in $event because Chrome autofill fires fake
10867      // key events that do not have keyCode property...
10868      "if(!$event.type.indexOf('key')&&" +
10869      (keys.map(genFilterCode).join('&&')) + ")return null;"
10870    )
10871  }
10872
10873  function genFilterCode (key) {
10874    var keyVal = parseInt(key, 10);
10875    if (keyVal) {
10876      return ("$event.keyCode!==" + keyVal)
10877    }
10878    var keyCode = keyCodes[key];
10879    var keyName = keyNames[key];
10880    return (
10881      "_k($event.keyCode," +
10882      (JSON.stringify(key)) + "," +
10883      (JSON.stringify(keyCode)) + "," +
10884      "$event.key," +
10885      "" + (JSON.stringify(keyName)) +
10886      ")"
10887    )
10888  }
10889
10890  /*  */
10891
10892  function on (el, dir) {
10893    if (dir.modifiers) {
10894      warn("v-on without argument does not support modifiers.");
10895    }
10896    el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
10897  }
10898
10899  /*  */
10900
10901  function bind$1 (el, dir) {
10902    el.wrapData = function (code) {
10903      return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
10904    };
10905  }
10906
10907  /*  */
10908
10909  var baseDirectives = {
10910    on: on,
10911    bind: bind$1,
10912    cloak: noop
10913  };
10914
10915  /*  */
10916
10917
10918
10919
10920
10921  var CodegenState = function CodegenState (options) {
10922    this.options = options;
10923    this.warn = options.warn || baseWarn;
10924    this.transforms = pluckModuleFunction(options.modules, 'transformCode');
10925    this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
10926    this.directives = extend(extend({}, baseDirectives), options.directives);
10927    var isReservedTag = options.isReservedTag || no;
10928    this.maybeComponent = function (el) { return !!el.component || !isReservedTag(el.tag); };
10929    this.onceId = 0;
10930    this.staticRenderFns = [];
10931    this.pre = false;
10932  };
10933
10934
10935
10936  function generate (
10937    ast,
10938    options
10939  ) {
10940    var state = new CodegenState(options);
10941    var code = ast ? genElement(ast, state) : '_c("div")';
10942    return {
10943      render: ("with(this){return " + code + "}"),
10944      staticRenderFns: state.staticRenderFns
10945    }
10946  }
10947
10948  function genElement (el, state) {
10949    if (el.parent) {
10950      el.pre = el.pre || el.parent.pre;
10951    }
10952
10953    if (el.staticRoot && !el.staticProcessed) {
10954      return genStatic(el, state)
10955    } else if (el.once && !el.onceProcessed) {
10956      return genOnce(el, state)
10957    } else if (el.for && !el.forProcessed) {
10958      return genFor(el, state)
10959    } else if (el.if && !el.ifProcessed) {
10960      return genIf(el, state)
10961    } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
10962      return genChildren(el, state) || 'void 0'
10963    } else if (el.tag === 'slot') {
10964      return genSlot(el, state)
10965    } else {
10966      // component or element
10967      var code;
10968      if (el.component) {
10969        code = genComponent(el.component, el, state);
10970      } else {
10971        var data;
10972        if (!el.plain || (el.pre && state.maybeComponent(el))) {
10973          data = genData$2(el, state);
10974        }
10975
10976        var children = el.inlineTemplate ? null : genChildren(el, state, true);

10977        code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
10978      }
10979      // module transforms
10980      for (var i = 0; i < state.transforms.length; i++) {
10981        code = state.transforms[i](el, code);
10982      }
10983      return code
10984    }
10985  }
10986
10987  // hoist static sub-trees out
10988  function genStatic (el, state) {
10989    el.staticProcessed = true;
10990    // Some elements (templates) need to behave differently inside of a v-pre
10991    // node.  All pre nodes are static roots, so we can use this as a location to
10992    // wrap a state change and reset it upon exiting the pre node.
10993    var originalPreState = state.pre;
10994    if (el.pre) {
10995      state.pre = el.pre;
10996    }
10997    state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
10998    state.pre = originalPreState;
10999    return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
11000  }
11001
11002  // v-once
11003  function genOnce (el, state) {
11004    el.onceProcessed = true;
11005    if (el.if && !el.ifProcessed) {
11006      return genIf(el, state)
11007    } else if (el.staticInFor) {
11008      var key = '';
11009      var parent = el.parent;
11010      while (parent) {
11011        if (parent.for) {
11012          key = parent.key;
11013          break
11014        }
11015        parent = parent.parent;
11016      }
11017      if (!key) {
11018        state.warn(
11019          "v-once can only be used inside v-for that is keyed. ",
11020          el.rawAttrsMap['v-once']
11021        );
11022        return genElement(el, state)
11023      }
11024      return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
11025    } else {
11026      return genStatic(el, state)
11027    }
11028  }
11029
11030  function genIf (
11031    el,
11032    state,
11033    altGen,
11034    altEmpty
11035  ) {
11036    el.ifProcessed = true; // avoid recursion
11037    return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
11038  }
11039
11040  function genIfConditions (
11041    conditions,
11042    state,
11043    altGen,
11044    altEmpty
11045  ) {
11046    if (!conditions.length) {
11047      return altEmpty || '_e()'
11048    }
11049
11050    var condition = conditions.shift();
11051    if (condition.exp) {
11052      return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
11053    } else {
11054      return ("" + (genTernaryExp(condition.block)))
11055    }
11056
11057    // v-if with v-once should generate code like (a)?_m(0):_m(1)
11058    function genTernaryExp (el) {
11059      return altGen
11060        ? altGen(el, state)
11061        : el.once
11062          ? genOnce(el, state)
11063          : genElement(el, state)
11064    }
11065  }
11066
11067  function genFor (
11068    el,
11069    state,
11070    altGen,
11071    altHelper
11072  ) {
11073    var exp = el.for;
11074    var alias = el.alias;
11075    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
11076    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
11077
11078    if (state.maybeComponent(el) &&
11079      el.tag !== 'slot' &&
11080      el.tag !== 'template' &&
11081      !el.key
11082    ) {
11083      state.warn(
11084        "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
11085        "v-for should have explicit keys. " +
11086        "See https://vuejs.org/guide/list.html#key for more info.",
11087        el.rawAttrsMap['v-for'],
11088        true /* tip */
11089      );
11090    }
11091
11092    el.forProcessed = true; // avoid recursion
11093    return (altHelper || '_l') + "((" + exp + ")," +
11094      "function(" + alias + iterator1 + iterator2 + "){" +
11095        "return " + ((altGen || genElement)(el, state)) +
11096      '})'
11097  }
11098
11099  function genData$2 (el, state) {
11100    var data = '{';
11101
11102    // directives first.
11103    // directives may mutate the el's other properties before they are generated.
11104    var dirs = genDirectives(el, state);
11105    if (dirs) { data += dirs + ','; }
11106
11107    // key
11108    if (el.key) {
11109      data += "key:" + (el.key) + ",";
11110    }
11111    // ref
11112    if (el.ref) {
11113      data += "ref:" + (el.ref) + ",";
11114    }
11115    if (el.refInFor) {
11116      data += "refInFor:true,";
11117    }
11118    // pre
11119    if (el.pre) {
11120      data += "pre:true,";
11121    }
11122    // record original tag name for components using "is" attribute
11123    if (el.component) {
11124      data += "tag:\"" + (el.tag) + "\",";
11125    }
11126    // module data generation functions
11127    for (var i = 0; i < state.dataGenFns.length; i++) {
11128      data += state.dataGenFns[i](el);
11129    }
11130    // attributes
11131    if (el.attrs) {

11132      data += "attrs:" + (genProps(el.attrs)) + ",";
11133    }
11134    // DOM props
11135    if (el.props) {
11136      data += "domProps:" + (genProps(el.props)) + ",";
11137    }
11138    // event handlers
11139    if (el.events) {
11140      data += (genHandlers(el.events, false)) + ",";
11141    }
11142    if (el.nativeEvents) {
11143      data += (genHandlers(el.nativeEvents, true)) + ",";
11144    }
11145    // slot target
11146    // only for non-scoped slots
11147    if (el.slotTarget && !el.slotScope) {
11148      data += "slot:" + (el.slotTarget) + ",";
11149    }
11150    // scoped slots
11151    if (el.scopedSlots) {
11152      data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
11153    }
11154    // component v-model
11155    if (el.model) {
11156      data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
11157    }
11158    // inline-template
11159    if (el.inlineTemplate) {
11160      var inlineTemplate = genInlineTemplate(el, state);
11161      if (inlineTemplate) {
11162        data += inlineTemplate + ",";
11163      }
11164    }
11165    data = data.replace(/,$/, '') + '}';
11166    // v-bind dynamic argument wrap
11167    // v-bind with dynamic arguments must be applied using the same v-bind object
11168    // merge helper so that class/style/mustUseProp attrs are handled correctly.
11169    if (el.dynamicAttrs) {
11170      data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genProps(el.dynamicAttrs)) + ")";
11171    }
11172    // v-bind data wrap
11173    if (el.wrapData) {
11174      data = el.wrapData(data);
11175    }
11176    // v-on data wrap
11177    if (el.wrapListeners) {
11178      data = el.wrapListeners(data);
11179    }
11180    return data
11181  }
11182
11183  function genDirectives (el, state) {
11184    var dirs = el.directives;
11185    if (!dirs) { return }
11186    var res = 'directives:[';
11187    var hasRuntime = false;
11188    var i, l, dir, needRuntime;
11189    for (i = 0, l = dirs.length; i < l; i++) {
11190      dir = dirs[i];
11191      needRuntime = true;
11192      var gen = state.directives[dir.name];
11193      if (gen) {
11194        // compile-time directive that manipulates AST.
11195        // returns true if it also needs a runtime counterpart.
11196        needRuntime = !!gen(el, dir, state.warn);
11197      }
11198      if (needRuntime) {
11199        hasRuntime = true;
11200        res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:" + (dir.isDynamicArg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
11201      }
11202    }
11203    if (hasRuntime) {
11204      return res.slice(0, -1) + ']'
11205    }
11206  }
11207
11208  function genInlineTemplate (el, state) {
11209    var ast = el.children[0];
11210    if (el.children.length !== 1 || ast.type !== 1) {
11211      state.warn(
11212        'Inline-template components must have exactly one child element.',
11213        { start: el.start }
11214      );
11215    }
11216    if (ast && ast.type === 1) {
11217      var inlineRenderFns = generate(ast, state.options);
11218      return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
11219    }
11220  }
11221
11222  function genScopedSlots (
11223    el,
11224    slots,
11225    state
11226  ) {
11227    // by default scoped slots are considered "stable", this allows child
11228    // components with only scoped slots to skip forced updates from parent.
11229    // but in some cases we have to bail-out of this optimization
11230    // for example if the slot contains dynamic names, has v-if or v-for on them...
11231    var needsForceUpdate = el.for || Object.keys(slots).some(function (key) {
11232      var slot = slots[key];
11233      return (
11234        slot.slotTargetDynamic ||
11235        slot.if ||
11236        slot.for ||
11237        containsSlotChild(slot) // is passing down slot from parent which may be dynamic
11238      )
11239    });
11240
11241    // #9534: if a component with scoped slots is inside a conditional branch,
11242    // it's possible for the same component to be reused but with different
11243    // compiled slot content. To avoid that, we generate a unique key based on
11244    // the generated code of all the slot contents.
11245    var needsKey = !!el.if;
11246
11247    // OR when it is inside another scoped slot or v-for (the reactivity may be
11248    // disconnected due to the intermediate scope variable)
11249    // #9438, #9506
11250    // TODO: this can be further optimized by properly analyzing in-scope bindings
11251    // and skip force updating ones that do not actually use scope variables.
11252    if (!needsForceUpdate) {
11253      var parent = el.parent;
11254      while (parent) {
11255        if (
11256          (parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
11257          parent.for
11258        ) {
11259          needsForceUpdate = true;
11260          break
11261        }
11262        if (parent.if) {
11263          needsKey = true;
11264        }
11265        parent = parent.parent;
11266      }
11267    }
11268
11269    var generatedSlots = Object.keys(slots)
11270      .map(function (key) { return genScopedSlot(slots[key], state); })
11271      .join(',');
11272
11273    return ("scopedSlots:_u([" + generatedSlots + "]" + (needsForceUpdate ? ",null,true" : "") + (!needsForceUpdate && needsKey ? (",null,fal

11273se," + (hash(generatedSlots))) : "") + ")")
11274  }
11275
11276  function hash(str) {
11277    var hash = 5381;
11278    var i = str.length;
11279    while(i) {
11280      hash = (hash * 33) ^ str.charCodeAt(--i);
11281    }
11282    return hash >>> 0
11283  }
11284
11285  function containsSlotChild (el) {
11286    if (el.type === 1) {
11287      if (el.tag === 'slot') {
11288        return true
11289      }
11290      return el.children.some(containsSlotChild)
11291    }
11292    return false
11293  }
11294
11295  function genScopedSlot (
11296    el,
11297    state
11298  ) {
11299    var isLegacySyntax = el.attrsMap['slot-scope'];
11300    if (el.if && !el.ifProcessed && !isLegacySyntax) {
11301      return genIf(el, state, genScopedSlot, "null")
11302    }
11303    if (el.for && !el.forProcessed) {
11304      return genFor(el, state, genScopedSlot)
11305    }
11306    var slotScope = el.slotScope === emptySlotScopeToken
11307      ? ""
11308      : String(el.slotScope);
11309    var fn = "function(" + slotScope + "){" +
11310      "return " + (el.tag === 'template'
11311        ? el.if && isLegacySyntax
11312          ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
11313          : genChildren(el, state) || 'undefined'
11314        : genElement(el, state)) + "}";
11315    // reverse proxy v-slot without scope on this.$slots
11316    var reverseProxy = slotScope ? "" : ",proxy:true";
11317    return ("{key:" + (el.slotTarget || "\"default\"") + ",fn:" + fn + reverseProxy + "}")
11318  }
11319
11320  function genChildren (
11321    el,
11322    state,
11323    checkSkip,
11324    altGenElement,
11325    altGenNode
11326  ) {
11327    var children = el.children;
11328    if (children.length) {
11329      var el$1 = children[0];
11330      // optimize single v-for
11331      if (children.length === 1 &&
11332        el$1.for &&
11333        el$1.tag !== 'template' &&
11334        el$1.tag !== 'slot'
11335      ) {
11336        var normalizationType = checkSkip
11337          ? state.maybeComponent(el$1) ? ",1" : ",0"
11338          : "";
11339        return ("" + ((altGenElement || genElement)(el$1, state)) + normalizationType)
11340      }
11341      var normalizationType$1 = checkSkip
11342        ? getNormalizationType(children, state.maybeComponent)
11343        : 0;
11344      var gen = altGenNode || genNode;
11345      return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType$1 ? ("," + normalizationType$1) : ''))
11346    }
11347  }
11348
11349  // determine the normalization needed for the children array.
11350  // 0: no normalization needed
11351  // 1: simple normalization needed (possible 1-level deep nested array)
11352  // 2: full normalization needed
11353  function getNormalizationType (
11354    children,
11355    maybeComponent
11356  ) {
11357    var res = 0;
11358    for (var i = 0; i < children.length; i++) {
11359      var el = children[i];
11360      if (el.type !== 1) {
11361        continue
11362      }
11363      if (needsNormalization(el) ||
11364          (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
11365        res = 2;
11366        break
11367      }
11368      if (maybeComponent(el) ||
11369          (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
11370        res = 1;
11371      }
11372    }
11373    return res
11374  }
11375
11376  function needsNormalization (el) {
11377    return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
11378  }
11379
11380  function genNode (node, state) {
11381    if (node.type === 1) {
11382      return genElement(node, state)
11383    } else if (node.type === 3 && node.isComment) {
11384      return genComment(node)
11385    } else {
11386      return genText(node)
11387    }
11388  }
11389
11390  function genText (text) {
11391    return ("_v(" + (text.type === 2
11392      ? text.expression // no need for () because already wrapped in _s()
11393      : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
11394  }
11395
11396  function genComment (comment) {
11397    return ("_e(" + (JSON.stringify(comment.text)) + ")")
11398  }
11399
11400  function genSlot (el, state) {
11401    var slotName = el.slotName || '"default"';
11402    var children = genChildren(el, state);
11403    var res = "_t(" + slotName + (children ? ("," + children) : '');
11404    var attrs = el.attrs || el.dynamicAttrs
11405      ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
11406          // slot props are camelized
11407          name: camelize(attr.name),
11408          value: attr.value,
11409          dynamic: attr.dynamic
11410        }); }))
11411      : null;
11412    var bind$$1 = el.attrsMap['v-bind'];
11413    if ((attrs || bind$$1) && !children) {
11414      res += ",null";
11415    }
11416    if (attrs) {
11417      res += "," + attrs;
11418    }
11419    if (bind$$1) {
11420      res += (attrs ? '' : ',null') + "," + bind$$1;
11421    }
11422    return res + ')'
11423  }
11424
11425  // componentName is el.component, take it as argument to shun flow's pessimistic refinement
11426  function genComponent (
11427    componentName,
11428    el,
11429    state
11430  ) {
11431    var children = el.inlineTemplate ? null : genChildren(el, state, true);
11432    return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
11433  }
11434
11435  function genProps (props) {
11436    var staticProps = "";
11437    var dynamicProps = "";
11438    for (var i = 0; i < props.length; i++) {
11439      var prop = props[i];
11440      var value = transformSpecialNewlines(prop.value);
11441      if (prop.dynamic) {
11442        dynamicProps += (prop.name) + "," + value + ",";
11443      } else {
11444        staticProps += "\"" + (prop.name) + "\":" + value + ",";
11445      }
11446    }
11447    staticProps = "{" + (staticProps.slice(0, -1)) + "}";
11448    if (dynamicProps) {
11449      return ("_d(" + staticProps + ",[" + (dynamicProps.slice(0, -1)) + "])")
11450    } else {
11451      return staticProps
11452    }
11453  }
11454
11455  // #3895, #4268
11456  function transformSpecialNewlines (text) {
11457    return text
11458      .replace(/\u2028/g, '\\u2028')
11459      .replace(/\u2029/g, '\\u2029')
11460  }
11461
11462  /*  */
11463
11464
11465
11466  // these keywords should not appear inside expressions, but operators like
11467  // typeof, instanceof and in are allowed
11468  var prohibitedKeywordRE = new RegExp('\\b' + (
11469    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
11470    'super,throw,while,yield,delete,export,import,return,switch,default,' +
11471    'extends,finally,continue,debugger,function,arguments'
11472  ).split(',').join('\\b|\\b') + '\\b');
11473
11474  // these unary operators should not be used as property/method names
11475  var unaryOperatorsRE = new RegExp('\\b' + (
11476    'delete,typeof,void'
11477  ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');
11478
11479  // strip strings in expressions
11480  var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
11481
11482  // detect problematic expressions in a template
11483  function detectErrors (ast, warn) {
11484    if (ast) {
11485      checkNode(ast, warn);
11486    }
11487  }
11488
11489  function checkNode (node, warn) {
11490    if (node.type === 1) {
11491      for (var name in node.attrsMap) {
11492        if (dirRE.test(name)) {
11493          var value = node.attrsMap[name];
11494          if (value) {
11495            var range = node.rawAttrsMap[name];
11496            if (name === 'v-for') {
11497              checkFor(node, ("v-for=\"" + value + "\""), warn, range);
11498            } else if (name === 'v-slot' || name[0] === '#') {
11499              checkFunctionParameterExpression(value, (name + "=\"" + value + "\""), warn, range);
11500            } else if (onRE.test(name)) {
11501              checkEvent(value, (name + "=\"" + value + "\""), warn, range);
11502            } else {
11503              checkExpression(value, (name + "=\"" + value + "\""), warn, range);
11504            }
11505          }
11506        }
11507      }
11508      if (node.children) {
11509        for (var i = 0; i < node.children.length; i++) {
11510          checkNode(node.children[i], warn);
11511        }
11512      }
11513    } else if (node.type === 2) {
11514      checkExpression(node.expression, node.text, warn, node);
11515    }
11516  }
11517
11518  function checkEvent (exp, text, warn, range) {
11519    var stripped = exp.replace(stripStringRE, '');
11520    var keywordMatch = stripped.match(unaryOperatorsRE);
11521    if (keywordMatch && stripped.charAt(keywordMatch.index - 1) !== '$') {
11522      warn(
11523        "avoid using JavaScript unary operator as property name: " +
11524        "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim()),
11525        range
11526      );
11527    }
11528    checkExpression(exp, text, warn, range);
11529  }
11530
11531  function checkFor (node, text, warn, range) {
11532    checkExpression(node.for || '', text, warn, range);
11533    checkIdentifier(node.alias, 'v-for alias', text, warn, range);
11534    checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range);
11535    checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range);
11536  }
11537
11538  function checkIdentifier (
11539    ident,
11540    type,
11541    text,
11542    warn,
11543    range
11544  ) {
11545    if (typeof ident === 'string') {

11546      try {
11547        new Function(("var " + ident + "=_"));
11548      } catch (e) {
11549        warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
11550      }
11551    }
11552  }
11553
11554  function checkExpression (exp, text, warn, range) {
11555    try {
11556      new Function(("return " + exp));
11557    } catch (e) {
11558      var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
11559      if (keywordMatch) {
11560        warn(
11561          "avoid using JavaScript keyword as property name: " +
11562          "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim()),
11563          range
11564        );
11565      } else {
11566        warn(
11567          "invalid expression: " + (e.message) + " in\n\n" +
11568          "    " + exp + "\n\n" +
11569          "  Raw expression: " + (text.trim()) + "\n",
11570          range
11571        );
11572      }
11573    }
11574  }
11575
11576  function checkFunctionParameterExpression (exp, text, warn, range) {
11577    try {
11578      new Function(exp, '');
11579    } catch (e) {
11580      warn(
11581        "invalid function parameter expression: " + (e.message) + " in\n\n" +
11582        "    " + exp + "\n\n" +
11583        "  Raw expression: " + (text.trim()) + "\n",
11584        range
11585      );
11586    }
11587  }
11588
11589  /*  */
11590
11591  var range = 2;
11592
11593  function generateCodeFrame (
11594    source,
11595    start,
11596    end
11597  ) {
11598    if ( start === void 0 ) start = 0;
11599    if ( end === void 0 ) end = source.length;
11600
11601    var lines = source.split(/\r?\n/);
11602    var count = 0;
11603    var res = [];
11604    for (var i = 0; i < lines.length; i++) {
11605      count += lines[i].length + 1;
11606      if (count >= start) {
11607        for (var j = i - range; j <= i + range || end > count; j++) {
11608          if (j < 0 || j >= lines.length) { continue }
11609          res.push(("" + (j + 1) + (repeat$1(" ", 3 - String(j + 1).length)) + "|  " + (lines[j])));
11610          var lineLength = lines[j].length;
11611          if (j === i) {
11612            // push underline
11613            var pad = start - (count - lineLength) + 1;
11614            var length = end > count ? lineLength - pad : end - start;
11615            res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
11616          } else if (j > i) {
11617            if (end > count) {
11618              var length$1 = Math.min(end - count, lineLength);
11619              res.push("   |  " + repeat$1("^", length$1));
11620            }
11621            count += lineLength + 1;
11622          }
11623        }
11624        break
11625      }
11626    }
11627    return res.join('\n')
11628  }
11629
11630  function repeat$1 (str, n) {
11631    var result = '';
11632    if (n > 0) {
11633      while (true) { // eslint-disable-line
11634        if (n & 1) { result += str; }
11635        n >>>= 1;
11636        if (n <= 0) { break }
11637        str += str;
11638      }
11639    }
11640    return result
11641  }
11642
11643  /*  */
11644
11645
11646
11647  function createFunction (code, errors) {
11648    try {
11649      return new Function(code)
11650    } catch (err) {
11651      errors.push({ err: err, code: code });
11652      return noop
11653    }
11654  }
11655
11656  function createCompileToFunctionFn (compile) {
11657    var cache = Object.create(null);
11658
11659    return function compileToFunctions (
11660      template,
11661      options,
11662      vm
11663    ) {
11664      options = extend({}, options);
11665      var warn$$1 = options.warn || warn;
11666      delete options.warn;
11667
11668      /* istanbul ignore if */
11669      {
11670        // detect possible CSP restriction
11671        try {
11672          new Function('return 1');
11673        } catch (e) {
11674          if (e.toString().match(/unsafe-eval|CSP/)) {
11675            warn$$1(
11676              'It seems you are using the standalone build of Vue.js in an ' +
11677              'environment with Content Security Policy that prohibits unsafe-eval. ' +
11678              'The template compiler cannot work in this environment. Consider ' +
11679              'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
11680              'templates into render functions.'
11681            );
11682          }
11683        }
11684      }
11685
11686      // check cache
11687      var key = options.delimiters
11688        ? String(options.delimiters) + template
11689        : template;
11690      if (cache[key]) {
11691        return cache[key]
11692      }
11693
11694      // compile
11695      var compiled = compile(template, options);
11696
11697      // check compilation errors/tips
11698      {
11699        if (compiled.errors && compiled.errors.length) {
11700          if (options.outputSourceRange) {

11701            compiled.errors.forEach(function (e) {
11702              warn$$1(
11703                "Error compiling template:\n\n" + (e.msg) + "\n\n" +
11704                generateCodeFrame(template, e.start, e.end),
11705                vm
11706              );
11707            });
11708          } else {
11709            warn$$1(
11710              "Error compiling template:\n\n" + template + "\n\n" +
11711              compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
11712              vm
11713            );
11714          }
11715        }
11716        if (compiled.tips && compiled.tips.length) {
11717          if (options.outputSourceRange) {
11718            compiled.tips.forEach(function (e) { return tip(e.msg, vm); });
11719          } else {
11720            compiled.tips.forEach(function (msg) { return tip(msg, vm); });
11721          }
11722        }
11723      }
11724
11725      // turn code into functions
11726      var res = {};
11727      var fnGenErrors = [];
11728      res.render = createFunction(compiled.render, fnGenErrors);
11729      res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
11730        return createFunction(code, fnGenErrors)
11731      });
11732
11733      // check function generation errors.
11734      // this should only happen if there is a bug in the compiler itself.
11735      // mostly for codegen development use
11736      /* istanbul ignore if */
11737      {
11738        if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
11739          warn$$1(
11740            "Failed to generate render function:\n\n" +
11741            fnGenErrors.map(function (ref) {
11742              var err = ref.err;
11743              var code = ref.code;
11744
11745              return ((err.toString()) + " in\n\n" + code + "\n");
11746          }).join('\n'),
11747            vm
11748          );
11749        }
11750      }
11751
11752      return (cache[key] = res)
11753    }
11754  }
11755
11756  /*  */
11757
11758  function createCompilerCreator (baseCompile) {
11759    return function createCompiler (baseOptions) {
11760      function compile (
11761        template,
11762        options
11763      ) {
11764        var finalOptions = Object.create(baseOptions);
11765        var errors = [];
11766        var tips = [];
11767
11768        var warn = function (msg, range, tip) {
11769          (tip ? tips : errors).push(msg);
11770        };
11771
11772        if (options) {
11773          if (options.outputSourceRange) {
11774            // $flow-disable-line
11775            var leadingSpaceLength = template.match(/^\s*/)[0].length;
11776
11777            warn = function (msg, range, tip) {
11778              var data = { msg: msg };
11779              if (range) {
11780                if (range.start != null) {
11781                  data.start = range.start + leadingSpaceLength;
11782                }
11783                if (range.end != null) {
11784                  data.end = range.end + leadingSpaceLength;
11785                }
11786              }
11787              (tip ? tips : errors).push(data);
11788            };
11789          }
11790          // merge custom modules
11791          if (options.modules) {
11792            finalOptions.modules =
11793              (baseOptions.modules || []).concat(options.modules);
11794          }
11795          // merge custom directives
11796          if (options.directives) {
11797            finalOptions.directives = extend(
11798              Object.create(baseOptions.directives || null),
11799              options.directives
11800            );
11801          }
11802          // copy other options
11803          for (var key in options) {
11804            if (key !== 'modules' && key !== 'directives') {
11805              finalOptions[key] = options[key];
11806            }
11807          }
11808        }
11809
11810        finalOptions.warn = warn;
11811
11812        var compiled = baseCompile(template.trim(), finalOptions);
11813        {
11814          detectErrors(compiled.ast, warn);
11815        }
11816        compiled.errors = errors;
11817        compiled.tips = tips;
11818        return compiled
11819      }
11820
11821      return {
11822        compile: compile,
11823        compileToFunctions: createCompileToFunctionFn(compile)
11824      }
11825    }
11826  }
11827
11828  /*  */
11829
11830  // `createCompilerCreator` allows creating compilers that use alternative
11831  // parser/optimizer/codegen, e.g the SSR optimizing compiler.
11832  // Here we just export a default compiler using the default parts.
11833  var createCompiler = createCompilerCreator(function baseCompile (
11834    template,
11835    options
11836  ) {
11837    var ast = parse(template.trim(), options);
11838    if (options.optimize !== false) {
11839      optimize(ast, options);
11840    }
11841    var code = generate(ast, options);
11842    return {
11843      ast: ast,
11844      render: code.render,
11845      staticRenderFns: code.staticRenderFns
11846    }
11847  });
11848
11849  /*  */
11850
11851  var ref$1 = createCompiler(baseOptions);
11852  var compile = ref$1.compile;
11853  var compileToFunctions = ref$1.compileToFunctions;
11854
11855  /*  */
11856
11857  // check whether current browser encodes a char inside attribute values
11858  var div;
11859  function getShouldDecode (href) {
11860    div = div || document.createElement('div');
11861    div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
11862    return div.innerHTML.indexOf('&#10;') > 0
11863  }
11864
11865  // #3663: IE encodes newlines inside attribute values while other browsers don't
11866  var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
11867  // #6828: chrome encodes content in a[href]
11868  var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;
11869
11870  /*  */
11871
11872  var idToTemplate = cached(function (id) {
11873    var el = query(id);
11874    return el && el.innerHTML
11875  });
11876
11877  var mount = Vue.prototype.$mount;
11878  Vue.prototype.$mount = function (
11879    el,
11880    hydrating
11881  ) {
11882    el = el && query(el);
11883
11884    /* istanbul ignore if */
11885    if (el === document.body || el === document.documentElement) {
11886      warn(
11887        "Do not mount Vue to <html> or <body> - mount to normal elements instead."
11888      );
11889      return this
11890    }
11891
11892    var options = this.$options;
11893    // resolve template/el and convert to render function
11894    if (!options.render) {
11895      var template = options.template;
11896      if (template) {
11897        if (typeof template === 'string') {
11898          if (template.charAt(0) === '#') {
11899            template = idToTemplate(template);
11900            /* istanbul ignore if */
11901            if (!template) {
11902              warn(
11903                ("Template element not found or is empty: " + (options.template)),
11904                this
11905              );
11906            }
11907          }
11908        } else if (template.nodeType) {
11909          template = template.innerHTML;
11910        } else {
11911          {
11912            warn('invalid template option:' + template, this);
11913          }
11914          return this
11915        }
11916      } else if (el) {
11917        template = getOuterHTML(el);
11918      }
11919      if (template) {
11920        /* istanbul ignore if */
11921        if (config.performance && mark) {
11922          mark('compile');
11923        }
11924
11925        var ref = compileToFunctions(template, {
11926          outputSourceRange: "development" !== 'production',
11927          shouldDecodeNewlines: shouldDecodeNewlines,
11928          shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
11929          delimiters: options.delimiters,
11930          comments: options.comments
11931        }, this);
11932        var render = ref.render;
11933        var staticRenderFns = ref.staticRenderFns;
11934        options.render = render;
11935        options.staticRenderFns = staticRenderFns;
11936
11937        /* istanbul ignore if */
11938        if (config.performance && mark) {
11939          mark('compile end');
11940          measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
11941        }
11942      }
11943    }
11944    return mount.call(this, el, hydrating)
11945  };
11946
11947  /**
11948   * Get outerHTML of elements, taking care
11949   * of SVG elements in IE as well.
11950   */
11951  function getOuterHTML (el) {
11952    if (el.outerHTML) {
11953      return el.outerHTML
11954    } else {
11955      var container = document.createElement('div');
11956      container.appendChild(el.cloneNode(true));
11957      return container.innerHTML
11958    }
11959  }
11960
11961  Vue.compile = compileToFunctions;
11962
11963  return Vue;
11964
11965}));