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comment-fold.js (2161B)

      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.registerGlobalHelper("fold", "comment", function(mode) {
     15   return mode.blockCommentStart && mode.blockCommentEnd;
     16 }, function(cm, start) {
     17   var mode = cm.getModeAt(start), startToken = mode.blockCommentStart, endToken = mode.blockCommentEnd;
     18   if (!startToken || !endToken) return;
     19   var line = start.line, lineText = cm.getLine(line);
     20 
     21   var startCh;
     22   for (var at = start.ch, pass = 0;;) {
     23     var found = at <= 0 ? -1 : lineText.lastIndexOf(startToken, at - 1);
     24     if (found == -1) {
     25       if (pass == 1) return;
     26       pass = 1;
     27       at = lineText.length;
     28       continue;
     29     }
     30     if (pass == 1 && found < start.ch) return;
     31     if (/comment/.test(cm.getTokenTypeAt(CodeMirror.Pos(line, found + 1))) &&
     32         (found == 0 || lineText.slice(found - endToken.length, found) == endToken ||
     33          !/comment/.test(cm.getTokenTypeAt(CodeMirror.Pos(line, found))))) {
     34       startCh = found + startToken.length;
     35       break;
     36     }
     37     at = found - 1;
     38   }
     39 
     40   var depth = 1, lastLine = cm.lastLine(), end, endCh;
     41   outer: for (var i = line; i <= lastLine; ++i) {
     42     var text = cm.getLine(i), pos = i == line ? startCh : 0;
     43     for (;;) {
     44       var nextOpen = text.indexOf(startToken, pos), nextClose = text.indexOf(endToken, pos);
     45       if (nextOpen < 0) nextOpen = text.length;
     46       if (nextClose < 0) nextClose = text.length;
     47       pos = Math.min(nextOpen, nextClose);
     48       if (pos == text.length) break;
     49       if (pos == nextOpen) ++depth;
     50       else if (!--depth) { end = i; endCh = pos; break outer; }
     51       ++pos;
     52     }
     53   }
     54   if (end == null || line == end && endCh == startCh) return;
     55   return {from: CodeMirror.Pos(line, startCh),
     56           to: CodeMirror.Pos(end, endCh)};
     57 });
     58 
     59 });