https://wordtohtml.net/js/codemirror5659/addon/fold/brace-fold.js?v=1663685212

1// CodeMirror, copyright (c) by Marijn Haverbeke and others
2// Distributed under an MIT license: https://codemirror.net/5/LICENSE
3
4(function(mod) {
5  if (typeof exports == "object" && typeof module == "object") // CommonJS
6    mod(require("../../lib/codemirror"));
7  else if (typeof define == "function" && define.amd) // AMD
8    define(["../../lib/codemirror"], mod);
9  else // Plain browser env
10    mod(CodeMirror);
11})(function(CodeMirror) {
12"use strict";
13
14function bracketFolding(pairs) {
15  return function(cm, start) {
16    var line = start.line, lineText = cm.getLine(line);
17
18    function findOpening(pair) {
19      var tokenType;
20      for (var at = start.ch, pass = 0;;) {
21        var found = at <= 0 ? -1 : lineText.lastIndexOf(pair[0], at - 1);
22        if (found == -1) {
23          if (pass == 1) break;
24          pass = 1;
25          at = lineText.length;
26          continue;
27        }
28        if (pass == 1 && found < start.ch) break;
29        tokenType = cm.getTokenTypeAt(CodeMirror.Pos(line, found + 1));
30        if (!/^(comment|string)/.test(tokenType)) return {ch: found + 1, tokenType: tokenType, pair: pair};
31        at = found - 1;
32      }
33    }
34
35    function findRange(found) {
36      var count = 1, lastLine = cm.lastLine(), end, startCh = found.ch, endCh
37      outer: for (var i = line; i <= lastLine; ++i) {
38        var text = cm.getLine(i), pos = i == line ? startCh : 0;
39        for (;;) {
40          var nextOpen = text.indexOf(found.pair[0], pos), nextClose = text.indexOf(found.pair[1], pos);
41          if (nextOpen < 0) nextOpen = text.length;
42          if (nextClose < 0) nextClose = text.length;
43          pos = Math.min(nextOpen, nextClose);
44          if (pos == text.length) break;
45          if (cm.getTokenTypeAt(CodeMirror.Pos(i, pos + 1)) == found.tokenType) {
46            if (pos == nextOpen) ++count;
47            else if (!--count) { end = i; endCh = pos; break outer; }
48          }
49          ++pos;
50        }
51      }
52
53      if (end == null || line == end) return null
54      return {from: CodeMirror.Pos(line, startCh),
55              to: CodeMirror.Pos(end, endCh)};
56    }
57
58    var found = []
59    for (var i = 0; i < pairs.length; i++) {
60      var open = findOpening(pairs[i])
61      if (open) found.push(open)
62    }
63    found.sort(function(a, b) { return a.ch - b.ch })
64    for (var i = 0; i < found.length; i++) {
65      var range = findRange(found[i])
66      if (range) return range
67    }
68    return null
69  }
70}
71
72CodeMirror.registerHelper("fold", "brace", bracketFolding([["{", "}"], ["[", "]"]]));
73
74CodeMirror.registerHelper("fold", "brace-paren", bracketFolding([["{", "}"], ["[", "]"], ["(", ")"]]));
75
76CodeMirror.registerHelper("fold", "import", function(cm, start) {
77  function hasImport(line) {
78    if (line < cm.firstLine() || line > cm.lastLine()) return null;
79    var start = cm.getTokenAt(CodeMirror.Pos(line, 1));
80    if (!/\S/.test(start.string)) start = cm.getTokenAt(CodeMirror.Pos(line, start.end + 1));
81    if (start.type != "keyword" || start.string != "import") return null;
82    // Now find closing semicolon, return its position
83    for (var i = line, e = Math.min(cm.lastLine(), line + 10); i <= e; ++i) {
84      var text = cm.getLine(i), semi = text.indexOf(";");
85      if (semi != -1) return {startCh: start.end, end: CodeMirror.Pos(i, semi)};
86    }
87  }
88
89  var startLine = start.line, has = hasImport(startLine), prev;
90  if (!has || hasImport(startLine - 1) || ((prev = hasImport(startLine - 2)) && prev.end.line == startLine - 1))
91    return null;
92  for (var end = has.end;;) {
93    var next = hasImport(end.line + 1);
94    if (next == null) break;
95    end = next.end;
96  }
97  return {from: cm.clipPos(CodeMirror.Pos(startLine, has.startCh + 1)), to: end};
98});
99
100CodeMirror.registerHelper("fold", "include", function(cm, start) {
101  function hasInclude(line) {
102    if (line < cm.firstLine() || line > cm.lastLine()) return null;
103    var start = cm.getTokenAt(CodeMirror.Pos(line, 1));
104    if (!/\S/.test(start.string)) start = cm.getTokenAt(CodeMirror.Pos(line, start.end + 1));
105    if (start.type == "meta" && start.string.slice(0, 8) == "#include") return start.start + 8;
106  }
107
108  var startLine = start.line, has = hasInclude(startLine);
109  if (has == null || hasInclude(startLine - 1) != null) return null;
110  for (var end = startLine;;) {
111    var next = hasInclude(end + 1);
112    if (next == null) break;
113    ++end;
114  }
115  return {from: CodeMirror.Pos(startLine, has + 1),
116          to: cm.clipPos(CodeMirror.Pos(end))};
117});
118
119});