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✏️ Editing: comment-fold.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

CodeMirror.registerGlobalHelper("fold", "comment", function(mode) {
  return mode.blockCommentStart && mode.blockCommentEnd;
}, function(cm, start) {
  var mode = cm.getModeAt(start), startToken = mode.blockCommentStart, endToken = mode.blockCommentEnd;
  if (!startToken || !endToken) return;
  var line = start.line, lineText = cm.getLine(line);

var startCh;
  for (var at = start.ch, pass = 0;;) {
    var found = at <= 0 ? -1 : lineText.lastIndexOf(startToken, at - 1);
    if (found == -1) {
      if (pass == 1) return;
      pass = 1;
      at = lineText.length;
      continue;
    }
    if (pass == 1 && found < start.ch) return;
    if (/comment/.test(cm.getTokenTypeAt(CodeMirror.Pos(line, found + 1))) &&
        (found == 0 || lineText.slice(found - endToken.length, found) == endToken ||
         !/comment/.test(cm.getTokenTypeAt(CodeMirror.Pos(line, found))))) {
      startCh = found + startToken.length;
      break;
    }
    at = found - 1;
  }

});

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