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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: http://codemirror.net/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  
  14  CodeMirror.registerHelper("fold", "markdown", function(cm, start) {
  15    var maxDepth = 100;
  16  
  17    function isHeader(lineNo) {
  18      var tokentype = cm.getTokenTypeAt(CodeMirror.Pos(lineNo, 0));
  19      return tokentype && /\bheader\b/.test(tokentype);
  20    }
  21  
  22    function headerLevel(lineNo, line, nextLine) {
  23      var match = line && line.match(/^#+/);
  24      if (match && isHeader(lineNo)) return match[0].length;
  25      match = nextLine && nextLine.match(/^[=\-]+\s*$/);
  26      if (match && isHeader(lineNo + 1)) return nextLine[0] == "=" ? 1 : 2;
  27      return maxDepth;
  28    }
  29  
  30    var firstLine = cm.getLine(start.line), nextLine = cm.getLine(start.line + 1);
  31    var level = headerLevel(start.line, firstLine, nextLine);
  32    if (level === maxDepth) return undefined;
  33  
  34    var lastLineNo = cm.lastLine();
  35    var end = start.line, nextNextLine = cm.getLine(end + 2);
  36    while (end < lastLineNo) {
  37      if (headerLevel(end + 1, nextLine, nextNextLine) <= level) break;
  38      ++end;
  39      nextLine = nextNextLine;
  40      nextNextLine = cm.getLine(end + 2);
  41    }
  42  
  43    return {
  44      from: CodeMirror.Pos(start.line, firstLine.length),
  45      to: CodeMirror.Pos(end, cm.getLine(end).length)
  46    };
  47  });
  48  
  49  });