js/95-matchbrackets.js

   1 (function() {
   2   var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
   3     (document.documentMode == null || document.documentMode < 8);
   4
   5   var Pos = CodeMirror.Pos;
   6
   7   var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
   8   function findMatchingBracket(cm, where, strict) {
   9     var state = cm.state.matchBrackets;
  10     var maxScanLen = (state && state.maxScanLineLength) || 10000;
  11     var maxScanLines = (state && state.maxScanLines) || 100;
  12
  13     var cur = where || cm.getCursor(), line = cm.getLineHandle(cur.line), pos = cur.ch - 1;
  14     var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
  15     if (!match) return null;
  16     var forward = match.charAt(1) == ">", d = forward ? 1 : -1;
  17     if (strict && forward != (pos == cur.ch)) return null;
  18     var style = cm.getTokenTypeAt(Pos(cur.line, pos + 1));
  19
  20     var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
  21     function scan(line, lineNo, start) {
  22       if (!line.text) return;
  23       var pos = forward ? 0 : line.text.length - 1, end = forward ? line.text.length : -1;
  24       if (line.text.length > maxScanLen) return null;
  25       if (start != null) pos = start + d;
  26       for (; pos != end; pos += d) {
  27         var ch = line.text.charAt(pos);
  28         if (re.test(ch) && cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style) {
  29           var match = matching[ch];
  30           if (match.charAt(1) == ">" == forward) stack.push(ch);
  31           else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
  32           else if (!stack.length) return {pos: pos, match: true};
  33         }
  34       }
  35     }
  36     for (var i = cur.line, found, e = forward ? Math.min(i + maxScanLines, cm.lineCount()) : Math.max(-1, i - maxScanLines); i != e; i+=d) {
  37       if (i == cur.line) found = scan(line, i, pos);
  38       else found = scan(cm.getLineHandle(i), i);
  39       if (found) break;
  40     }
  41     return {from: Pos(cur.line, pos), to: found && Pos(i, found.pos),
  42             match: found && found.match, forward: forward};
  43   }
  44
  45   function matchBrackets(cm, autoclear) {
  46     // Disable brace matching in long lines, since it'll cause hugely slow updates
  47     var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;
  48     var found = findMatchingBracket(cm);
  49     if (!found || cm.getLine(found.from.line).length > maxHighlightLen ||
  50        found.to && cm.getLine(found.to.line).length > maxHighlightLen)
  51       return;
  52
  53     var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
  54     var one = cm.markText(found.from, Pos(found.from.line, found.from.ch + 1), {className: style});
  55     var two = found.to && cm.markText(found.to, Pos(found.to.line, found.to.ch + 1), {className: style});
  56     // Kludge to work around the IE bug from issue #1193, where text
  57     // input stops going to the textarea whenever this fires.
  58     if (ie_lt8 && cm.state.focused) cm.display.input.focus();
  59     var clear = function() {
  60       cm.operation(function() { one.clear(); two && two.clear(); });
  61     };
  62     if (autoclear) setTimeout(clear, 800);
  63     else return clear;
  64   }
  65
  66   var currentlyHighlighted = null;
  67   function doMatchBrackets(cm) {
  68     cm.operation(function() {
  69       if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;}
  70       if (!cm.somethingSelected()) currentlyHighlighted = matchBrackets(cm, false);
  71     });
  72   }
  73
  74   CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
  75     if (old && old != CodeMirror.Init)
  76       cm.off("cursorActivity", doMatchBrackets);
  77     if (val) {
  78       cm.state.matchBrackets = typeof val == "object" ? val : {};
  79       cm.on("cursorActivity", doMatchBrackets);
  80     }
  81   });
  82
  83   CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
  84   CodeMirror.defineExtension("findMatchingBracket", function(pos, strict){
  85     return findMatchingBracket(this, pos, strict);
  86   });
  87 })();