Function scan

static/js/codemirror/addon/edit/matchbrackets.js:18–31

(line, lineNo, start)

    var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
    function scan(line, lineNo, start) {
      if (!line.text) return;
      var pos = forward ? 0 : line.text.length - 1, end = forward ? line.text.length : -1;
      if (start != null) pos = start + d;
      for (; pos != end; pos += d) {
        var ch = line.text.charAt(pos);
        if (re.test(ch) && cm.getTokenAt(Pos(lineNo, pos + 1)).type == style) {
          var match = matching[ch];
          if (match.charAt(1) == ">" == forward) stack.push(ch);
          else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
          else if (!stack.length) return {pos: pos, match: true};
        }
      }
    }
    for (var i = cur.line, found, e = forward ? Math.min(i + 100, cm.lineCount()) : Math.max(-1, i - 100); i != e; i+=d) {
      if (i == cur.line) found = scan(line, i, pos);
      else found = scan(cm.getLineHandle(i), i);