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1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
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2 // Distributed under an MIT license: https://codemirror.net/5/LICENSE
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3
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4 (function(mod) {
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5 if (typeof exports == "object" && typeof module == "object") // CommonJS
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6 mod(require("../../lib/codemirror"));
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7 else if (typeof define == "function" && define.amd) // AMD
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8 define(["../../lib/codemirror"], mod);
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9 else // Plain browser env
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10 mod(CodeMirror);
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11 })(function(CodeMirror) {
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12 "use strict";
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13
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14 CodeMirror.registerHelper("fold", "markdown", function(cm, start) {
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15 var maxDepth = 100;
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16
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17 function isHeader(lineNo) {
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18 var tokentype = cm.getTokenTypeAt(CodeMirror.Pos(lineNo, 0));
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19 return tokentype && /\bheader\b/.test(tokentype);
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20 }
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21
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22 function headerLevel(lineNo, line, nextLine) {
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23 var match = line && line.match(/^#+/);
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24 if (match && isHeader(lineNo)) return match[0].length;
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25 match = nextLine && nextLine.match(/^[=\-]+\s*$/);
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26 if (match && isHeader(lineNo + 1)) return nextLine[0] == "=" ? 1 : 2;
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27 return maxDepth;
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28 }
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29
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30 var firstLine = cm.getLine(start.line), nextLine = cm.getLine(start.line + 1);
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31 var level = headerLevel(start.line, firstLine, nextLine);
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32 if (level === maxDepth) return undefined;
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33
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34 var lastLineNo = cm.lastLine();
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35 var end = start.line, nextNextLine = cm.getLine(end + 2);
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36 while (end < lastLineNo) {
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37 if (headerLevel(end + 1, nextLine, nextNextLine) <= level) break;
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38 ++end;
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39 nextLine = nextNextLine;
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40 nextNextLine = cm.getLine(end + 2);
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41 }
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42
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43 return {
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44 from: CodeMirror.Pos(start.line, firstLine.length),
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45 to: CodeMirror.Pos(end, cm.getLine(end).length)
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46 };
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47 });
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48
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49 });
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