--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/nabble/view/web/util/codemirror/js/editor.js	Thu Mar 21 19:15:52 2019 -0600
@@ -0,0 +1,1671 @@
+/* The Editor object manages the content of the editable frame. It
+ * catches events, colours nodes, and indents lines. This file also
+ * holds some functions for transforming arbitrary DOM structures into
+ * plain sequences of <span> and <br> elements
+ */
+
+var internetExplorer = document.selection && window.ActiveXObject && /MSIE/.test(navigator.userAgent);
+var webkit = /AppleWebKit/.test(navigator.userAgent);
+var safari = /Apple Computer, Inc/.test(navigator.vendor);
+var gecko = navigator.userAgent.match(/gecko\/(\d{8})/i);
+if (gecko) gecko = Number(gecko[1]);
+var mac = /Mac/.test(navigator.platform);
+
+// TODO this is related to the backspace-at-end-of-line bug. Remove
+// this if Opera gets their act together, make the version check more
+// broad if they don't.
+var brokenOpera = window.opera && /Version\/10.[56]/.test(navigator.userAgent);
+// TODO remove this once WebKit 533 becomes less common.
+var slowWebkit = /AppleWebKit\/533/.test(navigator.userAgent);
+
+// Make sure a string does not contain two consecutive 'collapseable'
+// whitespace characters.
+function makeWhiteSpace(n) {
+  var buffer = [], nb = true;
+  for (; n > 0; n--) {
+    buffer.push((nb || n == 1) ? nbsp : " ");
+    nb ^= true;
+  }
+  return buffer.join("");
+}
+
+// Create a set of white-space characters that will not be collapsed
+// by the browser, but will not break text-wrapping either.
+function fixSpaces(string) {
+  if (string.charAt(0) == " ") string = nbsp + string.slice(1);
+  return string.replace(/\t/g, function() {return makeWhiteSpace(indentUnit);})
+    .replace(/[ \u00a0]{2,}/g, function(s) {return makeWhiteSpace(s.length);});
+}
+
+function cleanText(text) {
+  return text.replace(/\u00a0/g, " ").replace(/\u200b/g, "");
+}
+
+// Create a SPAN node with the expected properties for document part
+// spans.
+function makePartSpan(value) {
+  var text = value;
+  if (value.nodeType == 3) text = value.nodeValue;
+  else value = document.createTextNode(text);
+
+  var span = document.createElement("span");
+  span.isPart = true;
+  span.appendChild(value);
+  span.currentText = text;
+  return span;
+}
+
+function alwaysZero() {return 0;}
+
+// On webkit, when the last BR of the document does not have text
+// behind it, the cursor can not be put on the line after it. This
+// makes pressing enter at the end of the document occasionally do
+// nothing (or at least seem to do nothing). To work around it, this
+// function makes sure the document ends with a span containing a
+// zero-width space character. The traverseDOM iterator filters such
+// character out again, so that the parsers won't see them. This
+// function is called from a few strategic places to make sure the
+// zwsp is restored after the highlighting process eats it.
+var webkitLastLineHack = webkit ?
+  function(container) {
+    var last = container.lastChild;
+    if (!last || !last.hackBR) {
+      var br = document.createElement("br");
+      br.hackBR = true;
+      container.appendChild(br);
+    }
+  } : function() {};
+
+function asEditorLines(string) {
+  var tab = makeWhiteSpace(indentUnit);
+  return map(string.replace(/\t/g, tab).replace(/\u00a0/g, " ").replace(/\r\n?/g, "\n").split("\n"), fixSpaces);
+}
+
+var Editor = (function(){
+  // The HTML elements whose content should be suffixed by a newline
+  // when converting them to flat text.
+  var newlineElements = {"P": true, "DIV": true, "LI": true};
+
+  // Helper function for traverseDOM. Flattens an arbitrary DOM node
+  // into an array of textnodes and <br> tags.
+  function simplifyDOM(root, atEnd) {
+    var result = [];
+    var leaving = true;
+
+    function simplifyNode(node, top) {
+      if (node.nodeType == 3) {
+        var text = node.nodeValue = fixSpaces(node.nodeValue.replace(/[\r\u200b]/g, "").replace(/\n/g, " "));
+        if (text.length) leaving = false;
+        result.push(node);
+      }
+      else if (isBR(node) && node.childNodes.length == 0) {
+        leaving = true;
+        result.push(node);
+      }
+      else {
+        for (var n = node.firstChild; n; n = n.nextSibling) simplifyNode(n);
+        if (!leaving && newlineElements.hasOwnProperty(node.nodeName.toUpperCase())) {
+          leaving = true;
+          if (!atEnd || !top)
+            result.push(document.createElement("br"));
+        }
+      }
+    }
+
+    simplifyNode(root, true);
+    return result;
+  }
+
+  // Creates a MochiKit-style iterator that goes over a series of DOM
+  // nodes. The values it yields are strings, the textual content of
+  // the nodes. It makes sure that all nodes up to and including the
+  // one whose text is being yielded have been 'normalized' to be just
+  // <span> and <br> elements.
+  function traverseDOM(start){
+    var nodeQueue = [];
+
+    // Create a function that can be used to insert nodes after the
+    // one given as argument.
+    function pointAt(node){
+      var parent = node.parentNode;
+      var next = node.nextSibling;
+      return function(newnode) {
+        parent.insertBefore(newnode, next);
+      };
+    }
+    var point = null;
+
+    // This an Opera-specific hack -- always insert an empty span
+    // between two BRs, because Opera's cursor code gets terribly
+    // confused when the cursor is between two BRs.
+    var afterBR = true;
+
+    // Insert a normalized node at the current point. If it is a text
+    // node, wrap it in a <span>, and give that span a currentText
+    // property -- this is used to cache the nodeValue, because
+    // directly accessing nodeValue is horribly slow on some browsers.
+    // The dirty property is used by the highlighter to determine
+    // which parts of the document have to be re-highlighted.
+    function insertPart(part){
+      var text = "\n";
+      if (part.nodeType == 3) {
+        select.snapshotChanged();
+        part = makePartSpan(part);
+        text = part.currentText;
+        afterBR = false;
+      }
+      else {
+        if (afterBR && window.opera)
+          point(makePartSpan(""));
+        afterBR = true;
+      }
+      part.dirty = true;
+      nodeQueue.push(part);
+      point(part);
+      return text;
+    }
+
+    // Extract the text and newlines from a DOM node, insert them into
+    // the document, and return the textual content. Used to replace
+    // non-normalized nodes.
+    function writeNode(node, end) {
+      var simplified = simplifyDOM(node, end);
+      for (var i = 0; i < simplified.length; i++)
+        simplified[i] = insertPart(simplified[i]);
+      return simplified.join("");
+    }
+
+    // Check whether a node is a normalized <span> element.
+    function partNode(node){
+      if (node.isPart && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
+        var text = node.firstChild.nodeValue;
+        node.dirty = node.dirty || text != node.currentText;
+        node.currentText = text;
+        return !/[\n\t\r]/.test(node.currentText);
+      }
+      return false;
+    }
+
+    // Advance to next node, return string for current node.
+    function next() {
+      if (!start) throw StopIteration;
+      var node = start;
+      start = node.nextSibling;
+
+      if (partNode(node)){
+        nodeQueue.push(node);
+        afterBR = false;
+        return node.currentText;
+      }
+      else if (isBR(node)) {
+        if (afterBR && window.opera)
+          node.parentNode.insertBefore(makePartSpan(""), node);
+        nodeQueue.push(node);
+        afterBR = true;
+        return "\n";
+      }
+      else {
+        var end = !node.nextSibling;
+        point = pointAt(node);
+        removeElement(node);
+        return writeNode(node, end);
+      }
+    }
+
+    // MochiKit iterators are objects with a next function that
+    // returns the next value or throws StopIteration when there are
+    // no more values.
+    return {next: next, nodes: nodeQueue};
+  }
+
+  // Determine the text size of a processed node.
+  function nodeSize(node) {
+    return isBR(node) ? 1 : node.currentText.length;
+  }
+
+  // Search backwards through the top-level nodes until the next BR or
+  // the start of the frame.
+  function startOfLine(node) {
+    while (node && !isBR(node)) node = node.previousSibling;
+    return node;
+  }
+  function endOfLine(node, container) {
+    if (!node) node = container.firstChild;
+    else if (isBR(node)) node = node.nextSibling;
+
+    while (node && !isBR(node)) node = node.nextSibling;
+    return node;
+  }
+
+  function time() {return new Date().getTime();}
+
+  // Client interface for searching the content of the editor. Create
+  // these by calling CodeMirror.getSearchCursor. To use, call
+  // findNext on the resulting object -- this returns a boolean
+  // indicating whether anything was found, and can be called again to
+  // skip to the next find. Use the select and replace methods to
+  // actually do something with the found locations.
+  function SearchCursor(editor, pattern, from, caseFold) {
+    this.editor = editor;
+    this.history = editor.history;
+    this.history.commit();
+    this.valid = !!pattern;
+    this.atOccurrence = false;
+    if (caseFold == undefined) caseFold = typeof pattern == "string" && pattern == pattern.toLowerCase();
+
+    function getText(node){
+      var line = cleanText(editor.history.textAfter(node));
+      return (caseFold ? line.toLowerCase() : line);
+    }
+
+    var topPos = {node: null, offset: 0}, self = this;
+    if (from && typeof from == "object" && typeof from.character == "number") {
+      editor.checkLine(from.line);
+      var pos = {node: from.line, offset: from.character};
+      this.pos = {from: pos, to: pos};
+    }
+    else if (from) {
+      this.pos = {from: select.cursorPos(editor.container, true) || topPos,
+                  to: select.cursorPos(editor.container, false) || topPos};
+    }
+    else {
+      this.pos = {from: topPos, to: topPos};
+    }
+
+    if (typeof pattern != "string") { // Regexp match
+      this.matches = function(reverse, node, offset) {
+        if (reverse) {
+          var line = getText(node).slice(0, offset), match = line.match(pattern), start = 0;
+          while (match) {
+            var ind = line.indexOf(match[0]);
+            start += ind;
+            line = line.slice(ind + 1);
+            var newmatch = line.match(pattern);
+            if (newmatch) match = newmatch;
+            else break;
+          }
+        }
+        else {
+          var line = getText(node).slice(offset), match = line.match(pattern),
+              start = match && offset + line.indexOf(match[0]);
+        }
+        if (match) {
+          self.currentMatch = match;
+          return {from: {node: node, offset: start},
+                  to: {node: node, offset: start + match[0].length}};
+        }
+      };
+      return;
+    }
+
+    if (caseFold) pattern = pattern.toLowerCase();
+    // Create a matcher function based on the kind of string we have.
+    var target = pattern.split("\n");
+    this.matches = (target.length == 1) ?
+      // For one-line strings, searching can be done simply by calling
+      // indexOf or lastIndexOf on the current line.
+      function(reverse, node, offset) {
+        var line = getText(node), len = pattern.length, match;
+        if (reverse ? (offset >= len && (match = line.lastIndexOf(pattern, offset - len)) != -1)
+                    : (match = line.indexOf(pattern, offset)) != -1)
+          return {from: {node: node, offset: match},
+                  to: {node: node, offset: match + len}};
+      } :
+      // Multi-line strings require internal iteration over lines, and
+      // some clunky checks to make sure the first match ends at the
+      // end of the line and the last match starts at the start.
+      function(reverse, node, offset) {
+        var idx = (reverse ? target.length - 1 : 0), match = target[idx], line = getText(node);
+        var offsetA = (reverse ? line.indexOf(match) + match.length : line.lastIndexOf(match));
+        if (reverse ? offsetA >= offset || offsetA != match.length
+                    : offsetA <= offset || offsetA != line.length - match.length)
+          return;
+
+        var pos = node;
+        while (true) {
+          if (reverse && !pos) return;
+          pos = (reverse ? this.history.nodeBefore(pos) : this.history.nodeAfter(pos) );
+          if (!reverse && !pos) return;
+
+          line = getText(pos);
+          match = target[reverse ? --idx : ++idx];
+
+          if (idx > 0 && idx < target.length - 1) {
+            if (line != match) return;
+            else continue;
+          }
+          var offsetB = (reverse ? line.lastIndexOf(match) : line.indexOf(match) + match.length);
+          if (reverse ? offsetB != line.length - match.length : offsetB != match.length)
+            return;
+          return {from: {node: reverse ? pos : node, offset: reverse ? offsetB : offsetA},
+                  to: {node: reverse ? node : pos, offset: reverse ? offsetA : offsetB}};
+        }
+      };
+  }
+
+  SearchCursor.prototype = {
+    findNext: function() {return this.find(false);},
+    findPrevious: function() {return this.find(true);},
+
+    find: function(reverse) {
+      if (!this.valid) return false;
+
+      var self = this, pos = reverse ? this.pos.from : this.pos.to,
+          node = pos.node, offset = pos.offset;
+      // Reset the cursor if the current line is no longer in the DOM tree.
+      if (node && !node.parentNode) {
+        node = null; offset = 0;
+      }
+      function savePosAndFail() {
+        var pos = {node: node, offset: offset};
+        self.pos = {from: pos, to: pos};
+        self.atOccurrence = false;
+        return false;
+      }
+
+      while (true) {
+        if (this.pos = this.matches(reverse, node, offset)) {
+          this.atOccurrence = true;
+          return true;
+        }
+
+        if (reverse) {
+          if (!node) return savePosAndFail();
+          node = this.history.nodeBefore(node);
+          offset = this.history.textAfter(node).length;
+        }
+        else {
+          var next = this.history.nodeAfter(node);
+          if (!next) {
+            offset = this.history.textAfter(node).length;
+            return savePosAndFail();
+          }
+          node = next;
+          offset = 0;
+        }        
+      }
+    },
+
+    select: function() {
+      if (this.atOccurrence) {
+        select.setCursorPos(this.editor.container, this.pos.from, this.pos.to);
+        select.scrollToCursor(this.editor.container);
+      }
+    },
+
+    replace: function(string) {
+      if (this.atOccurrence) {
+        var fragments = this.currentMatch;
+        if (fragments)
+          string = string.replace(/\\(\d)/, function(m, i){return fragments[i];});
+        var end = this.editor.replaceRange(this.pos.from, this.pos.to, string);
+        this.pos.to = end;
+        this.atOccurrence = false;
+      }
+    },
+
+    position: function() {
+      if (this.atOccurrence)
+        return {line: this.pos.from.node, character: this.pos.from.offset};
+    }
+  };
+
+  // The Editor object is the main inside-the-iframe interface.
+  function Editor(options) {
+    this.options = options;
+    window.indentUnit = options.indentUnit;
+    var container = this.container = document.body;
+    this.history = new UndoHistory(container, options.undoDepth, options.undoDelay, this);
+    var self = this;
+
+    if (!Editor.Parser)
+      throw "No parser loaded.";
+    if (options.parserConfig && Editor.Parser.configure)
+      Editor.Parser.configure(options.parserConfig);
+
+    if (!options.readOnly && !internetExplorer)
+      select.setCursorPos(container, {node: null, offset: 0});
+
+    this.dirty = [];
+    this.importCode(options.content || "");
+    this.history.onChange = options.onChange;
+
+    if (!options.readOnly) {
+      if (options.continuousScanning !== false) {
+        this.scanner = this.documentScanner(options.passTime);
+        this.delayScanning();
+      }
+
+      function setEditable() {
+        // Use contentEditable instead of designMode on IE, since designMode frames
+        // can not run any scripts. It would be nice if we could use contentEditable
+        // everywhere, but it is significantly flakier than designMode on every
+        // single non-IE browser.
+        if (document.body.contentEditable != undefined && internetExplorer)
+          document.body.contentEditable = "true";
+        else
+          document.designMode = "on";
+
+        // Work around issue where you have to click on the actual
+        // body of the document to focus it in IE, making focusing
+        // hard when the document is small.
+        if (internetExplorer && options.height != "dynamic")
+          document.body.style.minHeight = (
+            window.frameElement.clientHeight - 2 * document.body.offsetTop - 5) + "px";
+
+        document.documentElement.style.borderWidth = "0";
+        if (!options.textWrapping)
+          container.style.whiteSpace = "nowrap";
+      }
+
+      // If setting the frame editable fails, try again when the user
+      // focus it (happens when the frame is not visible on
+      // initialisation, in Firefox).
+      try {
+        setEditable();
+      }
+      catch(e) {
+        var focusEvent = addEventHandler(document, "focus", function() {
+          focusEvent();
+          setEditable();
+        }, true);
+      }
+
+      addEventHandler(document, "keydown", method(this, "keyDown"));
+      addEventHandler(document, "keypress", method(this, "keyPress"));
+      addEventHandler(document, "keyup", method(this, "keyUp"));
+
+      function cursorActivity() {self.cursorActivity(false);}
+      addEventHandler(internetExplorer ? document.body : window, "mouseup", cursorActivity);
+      addEventHandler(document.body, "cut", cursorActivity);
+
+      // workaround for a gecko bug [?] where going forward and then
+      // back again breaks designmode (no more cursor)
+      if (gecko)
+        addEventHandler(window, "pagehide", function(){self.unloaded = true;});
+
+      addEventHandler(document.body, "paste", function(event) {
+        cursorActivity();
+        var text = null;
+        try {
+          var clipboardData = event.clipboardData || window.clipboardData;
+          if (clipboardData) text = clipboardData.getData('Text');
+        }
+        catch(e) {}
+        if (text !== null) {
+          event.stop();
+          self.replaceSelection(text);
+          select.scrollToCursor(self.container);
+        }
+      });
+
+      if (this.options.autoMatchParens)
+        addEventHandler(document.body, "click", method(this, "scheduleParenHighlight"));
+    }
+    else if (!options.textWrapping) {
+      container.style.whiteSpace = "nowrap";
+    }
+  }
+
+  function isSafeKey(code) {
+    return (code >= 16 && code <= 18) || // shift, control, alt
+           (code >= 33 && code <= 40); // arrows, home, end
+  }
+
+  Editor.prototype = {
+    // Import a piece of code into the editor.
+    importCode: function(code) {
+      var lines = asEditorLines(code), chunk = 1000;
+      if (!this.options.incrementalLoading || lines.length < chunk) {
+        this.history.push(null, null, lines);
+        this.history.reset();
+      }
+      else {
+        var cur = 0, self = this;
+        function addChunk() {
+          var chunklines = lines.slice(cur, cur + chunk);
+          chunklines.push("");
+          self.history.push(self.history.nodeBefore(null), null, chunklines);
+          self.history.reset();
+          cur += chunk;
+          if (cur < lines.length)
+            parent.setTimeout(addChunk, 1000);
+        }
+        addChunk();
+      }
+    },
+
+    // Extract the code from the editor.
+    getCode: function() {
+      if (!this.container.firstChild)
+        return "";
+
+      var accum = [];
+      select.markSelection();
+      forEach(traverseDOM(this.container.firstChild), method(accum, "push"));
+      select.selectMarked();
+      // On webkit, don't count last (empty) line if the webkitLastLineHack BR is present
+      if (webkit && this.container.lastChild.hackBR)
+        accum.pop();
+      webkitLastLineHack(this.container);
+      return cleanText(accum.join(""));
+    },
+
+    checkLine: function(node) {
+      if (node === false || !(node == null || node.parentNode == this.container || node.hackBR))
+        throw parent.CodeMirror.InvalidLineHandle;
+    },
+
+    cursorPosition: function(start) {
+      if (start == null) start = true;
+      var pos = select.cursorPos(this.container, start);
+      if (pos) return {line: pos.node, character: pos.offset};
+      else return {line: null, character: 0};
+    },
+
+    firstLine: function() {
+      return null;
+    },
+
+    lastLine: function() {
+      var last = this.container.lastChild;
+      if (last) last = startOfLine(last);
+      if (last && last.hackBR) last = startOfLine(last.previousSibling);
+      return last;
+    },
+
+    nextLine: function(line) {
+      this.checkLine(line);
+      var end = endOfLine(line, this.container);
+      if (!end || end.hackBR) return false;
+      else return end;
+    },
+
+    prevLine: function(line) {
+      this.checkLine(line);
+      if (line == null) return false;
+      return startOfLine(line.previousSibling);
+    },
+
+    visibleLineCount: function() {
+      var line = this.container.firstChild;
+      while (line && isBR(line)) line = line.nextSibling; // BR heights are unreliable
+      if (!line) return false;
+      var innerHeight = (window.innerHeight
+                         || document.documentElement.clientHeight
+                         || document.body.clientHeight);
+      return Math.floor(innerHeight / line.offsetHeight);
+    },
+
+    selectLines: function(startLine, startOffset, endLine, endOffset) {
+      this.checkLine(startLine);
+      var start = {node: startLine, offset: startOffset}, end = null;
+      if (endOffset !== undefined) {
+        this.checkLine(endLine);
+        end = {node: endLine, offset: endOffset};
+      }
+      select.setCursorPos(this.container, start, end);
+      select.scrollToCursor(this.container);
+    },
+
+    lineContent: function(line) {
+      var accum = [];
+      for (line = line ? line.nextSibling : this.container.firstChild;
+           line && !isBR(line); line = line.nextSibling)
+        accum.push(nodeText(line));
+      return cleanText(accum.join(""));
+    },
+
+    setLineContent: function(line, content) {
+      this.history.commit();
+      this.replaceRange({node: line, offset: 0},
+                        {node: line, offset: this.history.textAfter(line).length},
+                        content);
+      this.addDirtyNode(line);
+      this.scheduleHighlight();
+    },
+
+    removeLine: function(line) {
+      var node = line ? line.nextSibling : this.container.firstChild;
+      while (node) {
+        var next = node.nextSibling;
+        removeElement(node);
+        if (isBR(node)) break;
+        node = next;
+      }
+      this.addDirtyNode(line);
+      this.scheduleHighlight();
+    },
+
+    insertIntoLine: function(line, position, content) {
+      var before = null;
+      if (position == "end") {
+        before = endOfLine(line, this.container);
+      }
+      else {
+        for (var cur = line ? line.nextSibling : this.container.firstChild; cur; cur = cur.nextSibling) {
+          if (position == 0) {
+            before = cur;
+            break;
+          }
+          var text = nodeText(cur);
+          if (text.length > position) {
+            before = cur.nextSibling;
+            content = text.slice(0, position) + content + text.slice(position);
+            removeElement(cur);
+            break;
+          }
+          position -= text.length;
+        }
+      }
+
+      var lines = asEditorLines(content);
+      for (var i = 0; i < lines.length; i++) {
+        if (i > 0) this.container.insertBefore(document.createElement("BR"), before);
+        this.container.insertBefore(makePartSpan(lines[i]), before);
+      }
+      this.addDirtyNode(line);
+      this.scheduleHighlight();
+    },
+
+    // Retrieve the selected text.
+    selectedText: function() {
+      var h = this.history;
+      h.commit();
+
+      var start = select.cursorPos(this.container, true),
+          end = select.cursorPos(this.container, false);
+      if (!start || !end) return "";
+
+      if (start.node == end.node)
+        return h.textAfter(start.node).slice(start.offset, end.offset);
+
+      var text = [h.textAfter(start.node).slice(start.offset)];
+      for (var pos = h.nodeAfter(start.node); pos != end.node; pos = h.nodeAfter(pos))
+        text.push(h.textAfter(pos));
+      text.push(h.textAfter(end.node).slice(0, end.offset));
+      return cleanText(text.join("\n"));
+    },
+
+    // Replace the selection with another piece of text.
+    replaceSelection: function(text) {
+      this.history.commit();
+
+      var start = select.cursorPos(this.container, true),
+          end = select.cursorPos(this.container, false);
+      if (!start || !end) return;
+
+      end = this.replaceRange(start, end, text);
+      select.setCursorPos(this.container, end);
+      webkitLastLineHack(this.container);
+    },
+
+    cursorCoords: function(start, internal) {
+      var sel = select.cursorPos(this.container, start);
+      if (!sel) return null;
+      var off = sel.offset, node = sel.node, self = this;
+      function measureFromNode(node, xOffset) {
+        var y = -(document.body.scrollTop || document.documentElement.scrollTop || 0),
+            x = -(document.body.scrollLeft || document.documentElement.scrollLeft || 0) + xOffset;
+        forEach([node, internal ? null : window.frameElement], function(n) {
+          while (n) {x += n.offsetLeft; y += n.offsetTop;n = n.offsetParent;}
+        });
+        return {x: x, y: y, yBot: y + node.offsetHeight};
+      }
+      function withTempNode(text, f) {
+        var node = document.createElement("SPAN");
+        node.appendChild(document.createTextNode(text));
+        try {return f(node);}
+        finally {if (node.parentNode) node.parentNode.removeChild(node);}
+      }
+
+      while (off) {
+        node = node ? node.nextSibling : this.container.firstChild;
+        var txt = nodeText(node);
+        if (off < txt.length)
+          return withTempNode(txt.substr(0, off), function(tmp) {
+            tmp.style.position = "absolute"; tmp.style.visibility = "hidden";
+            tmp.className = node.className;
+            self.container.appendChild(tmp);
+            return measureFromNode(node, tmp.offsetWidth);
+          });
+        off -= txt.length;
+      }
+      if (node && isSpan(node))
+        return measureFromNode(node, node.offsetWidth);
+      else if (node && node.nextSibling && isSpan(node.nextSibling))
+        return measureFromNode(node.nextSibling, 0);
+      else
+        return withTempNode("\u200b", function(tmp) {
+          if (node) node.parentNode.insertBefore(tmp, node.nextSibling);
+          else self.container.insertBefore(tmp, self.container.firstChild);
+          return measureFromNode(tmp, 0);
+        });
+    },
+
+    reroutePasteEvent: function() {
+      if (this.capturingPaste || window.opera || (gecko && gecko >= 20101026)) return;
+      this.capturingPaste = true;
+      var te = window.frameElement.CodeMirror.textareaHack;
+      var coords = this.cursorCoords(true, true);
+      te.style.top = coords.y + "px";
+      if (internetExplorer) {
+        var snapshot = select.getBookmark(this.container);
+        if (snapshot) this.selectionSnapshot = snapshot;
+      }
+      parent.focus();
+      te.value = "";
+      te.focus();
+
+      var self = this;
+      parent.setTimeout(function() {
+        self.capturingPaste = false;
+        window.focus();
+        if (self.selectionSnapshot) // IE hack
+          window.select.setBookmark(self.container, self.selectionSnapshot);
+        var text = te.value;
+        if (text) {
+          self.replaceSelection(text);
+          select.scrollToCursor(self.container);
+        }
+      }, 10);
+    },
+
+    replaceRange: function(from, to, text) {
+      var lines = asEditorLines(text);
+      lines[0] = this.history.textAfter(from.node).slice(0, from.offset) + lines[0];
+      var lastLine = lines[lines.length - 1];
+      lines[lines.length - 1] = lastLine + this.history.textAfter(to.node).slice(to.offset);
+      var end = this.history.nodeAfter(to.node);
+      this.history.push(from.node, end, lines);
+      return {node: this.history.nodeBefore(end),
+              offset: lastLine.length};
+    },
+
+    getSearchCursor: function(string, fromCursor, caseFold) {
+      return new SearchCursor(this, string, fromCursor, caseFold);
+    },
+
+    // Re-indent the whole buffer
+    reindent: function() {
+      if (this.container.firstChild)
+        this.indentRegion(null, this.container.lastChild);
+    },
+
+    reindentSelection: function(direction) {
+      if (!select.somethingSelected()) {
+        this.indentAtCursor(direction);
+      }
+      else {
+        var start = select.selectionTopNode(this.container, true),
+            end = select.selectionTopNode(this.container, false);
+        if (start === false || end === false) return;
+        this.indentRegion(start, end, direction, true);
+      }
+    },
+
+    grabKeys: function(eventHandler, filter) {
+      this.frozen = eventHandler;
+      this.keyFilter = filter;
+    },
+    ungrabKeys: function() {
+      this.frozen = "leave";
+    },
+
+    setParser: function(name, parserConfig) {
+      Editor.Parser = window[name];
+      parserConfig = parserConfig || this.options.parserConfig;
+      if (parserConfig && Editor.Parser.configure)
+        Editor.Parser.configure(parserConfig);
+
+      if (this.container.firstChild) {
+        forEach(this.container.childNodes, function(n) {
+          if (n.nodeType != 3) n.dirty = true;
+        });
+        this.addDirtyNode(this.firstChild);
+        this.scheduleHighlight();
+      }
+    },
+
+    // Intercept enter and tab, and assign their new functions.
+    keyDown: function(event) {
+      if (this.frozen == "leave") {this.frozen = null; this.keyFilter = null;}
+      if (this.frozen && (!this.keyFilter || this.keyFilter(event.keyCode, event))) {
+        event.stop();
+        this.frozen(event);
+        return;
+      }
+
+      var code = event.keyCode;
+      // Don't scan when the user is typing.
+      this.delayScanning();
+      // Schedule a paren-highlight event, if configured.
+      if (this.options.autoMatchParens)
+        this.scheduleParenHighlight();
+
+      // The various checks for !altKey are there because AltGr sets both
+      // ctrlKey and altKey to true, and should not be recognised as
+      // Control.
+      if (code == 13) { // enter
+        if (event.ctrlKey && !event.altKey) {
+          this.reparseBuffer();
+        }
+        else {
+          select.insertNewlineAtCursor();
+          var mode = this.options.enterMode;
+          if (mode != "flat") this.indentAtCursor(mode == "keep" ? "keep" : undefined);
+          select.scrollToCursor(this.container);
+        }
+        event.stop();
+      }
+      else if (code == 9 && this.options.tabMode != "default" && !event.ctrlKey) { // tab
+        this.handleTab(!event.shiftKey);
+        event.stop();
+      }
+      else if (code == 32 && event.shiftKey && this.options.tabMode == "default") { // space
+        this.handleTab(true);
+        event.stop();
+      }
+      else if (code == 36 && !event.shiftKey && !event.ctrlKey) { // home
+        if (this.home()) event.stop();
+      }
+      else if (code == 35 && !event.shiftKey && !event.ctrlKey) { // end
+        if (this.end()) event.stop();
+      }
+      // Only in Firefox is the default behavior for PgUp/PgDn correct.
+      else if (code == 33 && !event.shiftKey && !event.ctrlKey && !gecko) { // PgUp
+        if (this.pageUp()) event.stop();
+      }
+      else if (code == 34 && !event.shiftKey && !event.ctrlKey && !gecko) {  // PgDn
+        if (this.pageDown()) event.stop();
+      }
+      else if ((code == 219 || code == 221) && event.ctrlKey && !event.altKey) { // [, ]
+        this.highlightParens(event.shiftKey, true);
+        event.stop();
+      }
+      else if (event.metaKey && !event.shiftKey && (code == 37 || code == 39)) { // Meta-left/right
+        var cursor = select.selectionTopNode(this.container);
+        if (cursor === false || !this.container.firstChild) return;
+
+        if (code == 37) select.focusAfterNode(startOfLine(cursor), this.container);
+        else {
+          var end = endOfLine(cursor, this.container);
+          select.focusAfterNode(end ? end.previousSibling : this.container.lastChild, this.container);
+        }
+        event.stop();
+      }
+      else if ((event.ctrlKey || event.metaKey) && !event.altKey) {
+        if ((event.shiftKey && code == 90) || code == 89) { // shift-Z, Y
+          select.scrollToNode(this.history.redo());
+          event.stop();
+        }
+        else if (code == 90 || (safari && code == 8)) { // Z, backspace
+          select.scrollToNode(this.history.undo());
+          event.stop();
+        }
+        else if (code == 83 && this.options.saveFunction) { // S
+          this.options.saveFunction();
+          event.stop();
+        }
+        else if (code == 86 && !mac) { // V
+          this.reroutePasteEvent();
+        }
+      }
+    },
+
+    // Check for characters that should re-indent the current line,
+    // and prevent Opera from handling enter and tab anyway.
+    keyPress: function(event) {
+      var electric = this.options.electricChars && Editor.Parser.electricChars, self = this;
+      // Hack for Opera, and Firefox on OS X, in which stopping a
+      // keydown event does not prevent the associated keypress event
+      // from happening, so we have to cancel enter and tab again
+      // here.
+      if ((this.frozen && (!this.keyFilter || this.keyFilter(event.keyCode || event.code, event))) ||
+          event.code == 13 || (event.code == 9 && this.options.tabMode != "default") ||
+          (event.code == 32 && event.shiftKey && this.options.tabMode == "default"))
+        event.stop();
+      else if (mac && (event.ctrlKey || event.metaKey) && event.character == "v") {
+        this.reroutePasteEvent();
+      }
+      else if (electric && electric.indexOf(event.character) != -1)
+        parent.setTimeout(function(){self.indentAtCursor(null);}, 0);
+      // Work around a bug where pressing backspace at the end of a
+      // line, or delete at the start, often causes the cursor to jump
+      // to the start of the line in Opera 10.60.
+      else if (brokenOpera) {
+        if (event.code == 8) { // backspace
+          var sel = select.selectionTopNode(this.container), self = this,
+              next = sel ? sel.nextSibling : this.container.firstChild;
+          if (sel !== false && next && isBR(next))
+            parent.setTimeout(function(){
+              if (select.selectionTopNode(self.container) == next)
+                select.focusAfterNode(next.previousSibling, self.container);
+            }, 20);
+        }
+        else if (event.code == 46) { // delete
+          var sel = select.selectionTopNode(this.container), self = this;
+          if (sel && isBR(sel)) {
+            parent.setTimeout(function(){
+              if (select.selectionTopNode(self.container) != sel)
+                select.focusAfterNode(sel, self.container);
+            }, 20);
+          }
+        }
+      }
+      // In 533.* WebKit versions, when the document is big, typing
+      // something at the end of a line causes the browser to do some
+      // kind of stupid heavy operation, creating delays of several
+      // seconds before the typed characters appear. This very crude
+      // hack inserts a temporary zero-width space after the cursor to
+      // make it not be at the end of the line.
+      else if (slowWebkit) {
+        var sel = select.selectionTopNode(this.container),
+            next = sel ? sel.nextSibling : this.container.firstChild;
+        // Doesn't work on empty lines, for some reason those always
+        // trigger the delay.
+        if (sel && next && isBR(next) && !isBR(sel)) {
+          var cheat = document.createTextNode("\u200b");
+          this.container.insertBefore(cheat, next);
+          parent.setTimeout(function() {
+            if (cheat.nodeValue == "\u200b") removeElement(cheat);
+            else cheat.nodeValue = cheat.nodeValue.replace("\u200b", "");
+          }, 20);
+        }
+      }
+
+      // Magic incantation that works abound a webkit bug when you
+      // can't type on a blank line following a line that's wider than
+      // the window.
+      if (webkit && !this.options.textWrapping)
+        setTimeout(function () {
+          var node = select.selectionTopNode(self.container, true);
+          if (node && node.nodeType == 3 && node.previousSibling && isBR(node.previousSibling)
+              && node.nextSibling && isBR(node.nextSibling))
+            node.parentNode.replaceChild(document.createElement("BR"), node.previousSibling);
+        }, 50);
+    },
+
+    // Mark the node at the cursor dirty when a non-safe key is
+    // released.
+    keyUp: function(event) {
+      this.cursorActivity(isSafeKey(event.keyCode));
+    },
+
+    // Indent the line following a given <br>, or null for the first
+    // line. If given a <br> element, this must have been highlighted
+    // so that it has an indentation method. Returns the whitespace
+    // element that has been modified or created (if any).
+    indentLineAfter: function(start, direction) {
+      function whiteSpaceAfter(node) {
+        var ws = node ? node.nextSibling : self.container.firstChild;
+        if (!ws || !hasClass(ws, "whitespace")) return null;
+        return ws;
+      }
+
+      // whiteSpace is the whitespace span at the start of the line,
+      // or null if there is no such node.
+      var self = this, whiteSpace = whiteSpaceAfter(start);
+      var newIndent = 0, curIndent = whiteSpace ? whiteSpace.currentText.length : 0;
+
+      var firstText = whiteSpace ? whiteSpace.nextSibling : (start ? start.nextSibling : this.container.firstChild);
+      if (direction == "keep") {
+        if (start) {
+          var prevWS = whiteSpaceAfter(startOfLine(start.previousSibling))
+          if (prevWS) newIndent = prevWS.currentText.length;
+        }
+      }
+      else {
+        // Sometimes the start of the line can influence the correct
+        // indentation, so we retrieve it.
+        var nextChars = (start && firstText && firstText.currentText) ? firstText.currentText : "";
+
+        // Ask the lexical context for the correct indentation, and
+        // compute how much this differs from the current indentation.
+        if (direction != null && this.options.tabMode != "indent")
+          newIndent = direction ? curIndent + indentUnit : Math.max(0, curIndent - indentUnit)
+        else if (start)
+          newIndent = start.indentation(nextChars, curIndent, direction, firstText);
+        else if (Editor.Parser.firstIndentation)
+          newIndent = Editor.Parser.firstIndentation(nextChars, curIndent, direction, firstText);
+      }
+      
+      var indentDiff = newIndent - curIndent;
+
+      // If there is too much, this is just a matter of shrinking a span.
+      if (indentDiff < 0) {
+        if (newIndent == 0) {
+          if (firstText) select.snapshotMove(whiteSpace.firstChild, firstText.firstChild || firstText, 0);
+          removeElement(whiteSpace);
+          whiteSpace = null;
+        }
+        else {
+          select.snapshotMove(whiteSpace.firstChild, whiteSpace.firstChild, indentDiff, true);
+          whiteSpace.currentText = makeWhiteSpace(newIndent);
+          whiteSpace.firstChild.nodeValue = whiteSpace.currentText;
+        }
+      }
+      // Not enough...
+      else if (indentDiff > 0) {
+        // If there is whitespace, we grow it.
+        if (whiteSpace) {
+          whiteSpace.currentText = makeWhiteSpace(newIndent);
+          whiteSpace.firstChild.nodeValue = whiteSpace.currentText;
+          select.snapshotMove(whiteSpace.firstChild, whiteSpace.firstChild, indentDiff, true);
+        }
+        // Otherwise, we have to add a new whitespace node.
+        else {
+          whiteSpace = makePartSpan(makeWhiteSpace(newIndent));
+          whiteSpace.className = "whitespace";
+          if (start) insertAfter(whiteSpace, start);
+          else this.container.insertBefore(whiteSpace, this.container.firstChild);
+          select.snapshotMove(firstText && (firstText.firstChild || firstText),
+                              whiteSpace.firstChild, newIndent, false, true);
+        }
+      }
+      // Make sure cursor ends up after the whitespace
+      else if (whiteSpace) {
+	select.snapshotMove(whiteSpace.firstChild, whiteSpace.firstChild, newIndent, false);
+      }
+      if (indentDiff != 0) this.addDirtyNode(start);
+    },
+
+    // Re-highlight the selected part of the document.
+    highlightAtCursor: function() {
+      var pos = select.selectionTopNode(this.container, true);
+      var to = select.selectionTopNode(this.container, false);
+      if (pos === false || to === false) return false;
+
+      select.markSelection();
+      if (this.highlight(pos, endOfLine(to, this.container), true, 20) === false)
+        return false;
+      select.selectMarked();
+      return true;
+    },
+
+    // When tab is pressed with text selected, the whole selection is
+    // re-indented, when nothing is selected, the line with the cursor
+    // is re-indented.
+    handleTab: function(direction) {
+      if (this.options.tabMode == "spaces" && !select.somethingSelected())
+        select.insertTabAtCursor();
+      else
+        this.reindentSelection(direction);
+    },
+
+    // Custom home behaviour that doesn't land the cursor in front of
+    // leading whitespace unless pressed twice.
+    home: function() {
+      var cur = select.selectionTopNode(this.container, true), start = cur;
+      if (cur === false || !(!cur || cur.isPart || isBR(cur)) || !this.container.firstChild)
+        return false;
+
+      while (cur && !isBR(cur)) cur = cur.previousSibling;
+      var next = cur ? cur.nextSibling : this.container.firstChild;
+      if (next && next != start && next.isPart && hasClass(next, "whitespace"))
+        select.focusAfterNode(next, this.container);
+      else
+        select.focusAfterNode(cur, this.container);
+
+      select.scrollToCursor(this.container);
+      return true;
+    },
+
+    // Some browsers (Opera) don't manage to handle the end key
+    // properly in the face of vertical scrolling.
+    end: function() {
+      var cur = select.selectionTopNode(this.container, true);
+      if (cur === false) return false;
+      cur = endOfLine(cur, this.container);
+      if (!cur) return false;
+      select.focusAfterNode(cur.previousSibling, this.container);
+      select.scrollToCursor(this.container);
+      return true;
+    },
+
+    pageUp: function() {
+      var line = this.cursorPosition().line, scrollAmount = this.visibleLineCount();
+      if (line === false || scrollAmount === false) return false;
+      // Try to keep one line on the screen.
+      scrollAmount -= 2;
+      for (var i = 0; i < scrollAmount; i++) {
+        line = this.prevLine(line);
+        if (line === false) break;
+      }
+      if (i == 0) return false; // Already at first line
+      select.setCursorPos(this.container, {node: line, offset: 0});
+      select.scrollToCursor(this.container);
+      return true;
+    },
+
+    pageDown: function() {
+      var line = this.cursorPosition().line, scrollAmount = this.visibleLineCount();
+      if (line === false || scrollAmount === false) return false;
+      // Try to move to the last line of the current page.
+      scrollAmount -= 2;
+      for (var i = 0; i < scrollAmount; i++) {
+        var nextLine = this.nextLine(line);
+        if (nextLine === false) break;
+        line = nextLine;
+      }
+      if (i == 0) return false; // Already at last line
+      select.setCursorPos(this.container, {node: line, offset: 0});
+      select.scrollToCursor(this.container);
+      return true;
+    },
+
+    // Delay (or initiate) the next paren highlight event.
+    scheduleParenHighlight: function() {
+      if (this.parenEvent) parent.clearTimeout(this.parenEvent);
+      var self = this;
+      this.parenEvent = parent.setTimeout(function(){self.highlightParens();}, 300);
+    },
+
+    // Take the token before the cursor. If it contains a character in
+    // '()[]{}', search for the matching paren/brace/bracket, and
+    // highlight them in green for a moment, or red if no proper match
+    // was found.
+    highlightParens: function(jump, fromKey) {
+      var self = this, mark = this.options.markParen;
+      if (typeof mark == "string") mark = [mark, mark];
+      // give the relevant nodes a colour.
+      function highlight(node, ok) {
+        if (!node) return;
+        if (!mark) {
+          node.style.fontWeight = "bold";
+          node.style.color = ok ? "#8F8" : "#F88";
+        }
+        else if (mark.call) mark(node, ok);
+        else node.className += " " + mark[ok ? 0 : 1];
+      }
+      function unhighlight(node) {
+        if (!node) return;
+        if (mark && !mark.call)
+          removeClass(removeClass(node, mark[0]), mark[1]);
+        else if (self.options.unmarkParen)
+          self.options.unmarkParen(node);
+        else {
+          node.style.fontWeight = "";
+          node.style.color = "";
+        }
+      }
+      if (!fromKey && self.highlighted) {
+        unhighlight(self.highlighted[0]);
+        unhighlight(self.highlighted[1]);
+      }
+
+      if (!window || !window.parent || !window.select) return;
+      // Clear the event property.
+      if (this.parenEvent) parent.clearTimeout(this.parenEvent);
+      this.parenEvent = null;
+
+      // Extract a 'paren' from a piece of text.
+      function paren(node) {
+        if (node.currentText) {
+          var match = node.currentText.match(/^[\s\u00a0]*([\(\)\[\]{}])[\s\u00a0]*$/);
+          return match && match[1];
+        }
+      }
+      // Determine the direction a paren is facing.
+      function forward(ch) {
+        return /[\(\[\{]/.test(ch);
+      }
+
+      var ch, cursor = select.selectionTopNode(this.container, true);
+      if (!cursor || !this.highlightAtCursor()) return;
+      cursor = select.selectionTopNode(this.container, true);
+      if (!(cursor && ((ch = paren(cursor)) || (cursor = cursor.nextSibling) && (ch = paren(cursor)))))
+        return;
+      // We only look for tokens with the same className.
+      var className = cursor.className, dir = forward(ch), match = matching[ch];
+
+      // Since parts of the document might not have been properly
+      // highlighted, and it is hard to know in advance which part we
+      // have to scan, we just try, and when we find dirty nodes we
+      // abort, parse them, and re-try.
+      function tryFindMatch() {
+        var stack = [], ch, ok = true;
+        for (var runner = cursor; runner; runner = dir ? runner.nextSibling : runner.previousSibling) {
+          if (runner.className == className && isSpan(runner) && (ch = paren(runner))) {
+            if (forward(ch) == dir)
+              stack.push(ch);
+            else if (!stack.length)
+              ok = false;
+            else if (stack.pop() != matching[ch])
+              ok = false;
+            if (!stack.length) break;
+          }
+          else if (runner.dirty || !isSpan(runner) && !isBR(runner)) {
+            return {node: runner, status: "dirty"};
+          }
+        }
+        return {node: runner, status: runner && ok};
+      }
+
+      while (true) {
+        var found = tryFindMatch();
+        if (found.status == "dirty") {
+          this.highlight(found.node, endOfLine(found.node));
+          // Needed because in some corner cases a highlight does not
+          // reach a node.
+          found.node.dirty = false;
+          continue;
+        }
+        else {
+          highlight(cursor, found.status);
+          highlight(found.node, found.status);
+          if (fromKey)
+            parent.setTimeout(function() {unhighlight(cursor); unhighlight(found.node);}, 500);
+          else
+            self.highlighted = [cursor, found.node];
+          if (jump && found.node)
+            select.focusAfterNode(found.node.previousSibling, this.container);
+          break;
+        }
+      }
+    },
+
+    // Adjust the amount of whitespace at the start of the line that
+    // the cursor is on so that it is indented properly.
+    indentAtCursor: function(direction) {
+      if (!this.container.firstChild) return;
+      // The line has to have up-to-date lexical information, so we
+      // highlight it first.
+      if (!this.highlightAtCursor()) return;
+      var cursor = select.selectionTopNode(this.container, false);
+      // If we couldn't determine the place of the cursor,
+      // there's nothing to indent.
+      if (cursor === false)
+        return;
+      select.markSelection();
+      this.indentLineAfter(startOfLine(cursor), direction);
+      select.selectMarked();
+    },
+
+    // Indent all lines whose start falls inside of the current
+    // selection.
+    indentRegion: function(start, end, direction, selectAfter) {
+      var current = (start = startOfLine(start)), before = start && startOfLine(start.previousSibling);
+      if (!isBR(end)) end = endOfLine(end, this.container);
+      this.addDirtyNode(start);
+
+      do {
+        var next = endOfLine(current, this.container);
+        if (current) this.highlight(before, next, true);
+        this.indentLineAfter(current, direction);
+        before = current;
+        current = next;
+      } while (current != end);
+      if (selectAfter)
+        select.setCursorPos(this.container, {node: start, offset: 0}, {node: end, offset: 0});
+    },
+
+    // Find the node that the cursor is in, mark it as dirty, and make
+    // sure a highlight pass is scheduled.
+    cursorActivity: function(safe) {
+      // pagehide event hack above
+      if (this.unloaded) {
+        window.document.designMode = "off";
+        window.document.designMode = "on";
+        this.unloaded = false;
+      }
+
+      if (internetExplorer) {
+        this.container.createTextRange().execCommand("unlink");
+        clearTimeout(this.saveSelectionSnapshot);
+        var self = this;
+        this.saveSelectionSnapshot = setTimeout(function() {
+          var snapshot = select.getBookmark(self.container);
+          if (snapshot) self.selectionSnapshot = snapshot;
+        }, 200);
+      }
+
+      var activity = this.options.onCursorActivity;
+      if (!safe || activity) {
+        var cursor = select.selectionTopNode(this.container, false);
+        if (cursor === false || !this.container.firstChild) return;
+        cursor = cursor || this.container.firstChild;
+        if (activity) activity(cursor);
+        if (!safe) {
+          this.scheduleHighlight();
+          this.addDirtyNode(cursor);
+        }
+      }
+    },
+
+    reparseBuffer: function() {
+      forEach(this.container.childNodes, function(node) {node.dirty = true;});
+      if (this.container.firstChild)
+        this.addDirtyNode(this.container.firstChild);
+    },
+
+    // Add a node to the set of dirty nodes, if it isn't already in
+    // there.
+    addDirtyNode: function(node) {
+      node = node || this.container.firstChild;
+      if (!node) return;
+
+      for (var i = 0; i < this.dirty.length; i++)
+        if (this.dirty[i] == node) return;
+
+      if (node.nodeType != 3)
+        node.dirty = true;
+      this.dirty.push(node);
+    },
+
+    allClean: function() {
+      return !this.dirty.length;
+    },
+
+    // Cause a highlight pass to happen in options.passDelay
+    // milliseconds. Clear the existing timeout, if one exists. This
+    // way, the passes do not happen while the user is typing, and
+    // should as unobtrusive as possible.
+    scheduleHighlight: function() {
+      // Timeouts are routed through the parent window, because on
+      // some browsers designMode windows do not fire timeouts.
+      var self = this;
+      parent.clearTimeout(this.highlightTimeout);
+      this.highlightTimeout = parent.setTimeout(function(){self.highlightDirty();}, this.options.passDelay);
+    },
+
+    // Fetch one dirty node, and remove it from the dirty set.
+    getDirtyNode: function() {
+      while (this.dirty.length > 0) {
+        var found = this.dirty.pop();
+        // IE8 sometimes throws an unexplainable 'invalid argument'
+        // exception for found.parentNode
+        try {
+          // If the node has been coloured in the meantime, or is no
+          // longer in the document, it should not be returned.
+          while (found && found.parentNode != this.container)
+            found = found.parentNode;
+          if (found && (found.dirty || found.nodeType == 3))
+            return found;
+        } catch (e) {}
+      }
+      return null;
+    },
+
+    // Pick dirty nodes, and highlight them, until options.passTime
+    // milliseconds have gone by. The highlight method will continue
+    // to next lines as long as it finds dirty nodes. It returns
+    // information about the place where it stopped. If there are
+    // dirty nodes left after this function has spent all its lines,
+    // it shedules another highlight to finish the job.
+    highlightDirty: function(force) {
+      // Prevent FF from raising an error when it is firing timeouts
+      // on a page that's no longer loaded.
+      if (!window || !window.parent || !window.select) return false;
+
+      if (!this.options.readOnly) select.markSelection();
+      var start, endTime = force ? null : time() + this.options.passTime;
+      while ((time() < endTime || force) && (start = this.getDirtyNode())) {
+        var result = this.highlight(start, endTime);
+        if (result && result.node && result.dirty)
+          this.addDirtyNode(result.node.nextSibling);
+      }
+      if (!this.options.readOnly) select.selectMarked();
+      if (start) this.scheduleHighlight();
+      return this.dirty.length == 0;
+    },
+
+    // Creates a function that, when called through a timeout, will
+    // continuously re-parse the document.
+    documentScanner: function(passTime) {
+      var self = this, pos = null;
+      return function() {
+        // FF timeout weirdness workaround.
+        if (!window || !window.parent || !window.select) return;
+        // If the current node is no longer in the document... oh
+        // well, we start over.
+        if (pos && pos.parentNode != self.container)
+          pos = null;
+        select.markSelection();
+        var result = self.highlight(pos, time() + passTime, true);
+        select.selectMarked();
+        var newPos = result ? (result.node && result.node.nextSibling) : null;
+        pos = (pos == newPos) ? null : newPos;
+        self.delayScanning();
+      };
+    },
+
+    // Starts the continuous scanning process for this document after
+    // a given interval.
+    delayScanning: function() {
+      if (this.scanner) {
+        parent.clearTimeout(this.documentScan);
+        this.documentScan = parent.setTimeout(this.scanner, this.options.continuousScanning);
+      }
+    },
+
+    // The function that does the actual highlighting/colouring (with
+    // help from the parser and the DOM normalizer). Its interface is
+    // rather overcomplicated, because it is used in different
+    // situations: ensuring that a certain line is highlighted, or
+    // highlighting up to X milliseconds starting from a certain
+    // point. The 'from' argument gives the node at which it should
+    // start. If this is null, it will start at the beginning of the
+    // document. When a timestamp is given with the 'target' argument,
+    // it will stop highlighting at that time. If this argument holds
+    // a DOM node, it will highlight until it reaches that node. If at
+    // any time it comes across two 'clean' lines (no dirty nodes), it
+    // will stop, except when 'cleanLines' is true. maxBacktrack is
+    // the maximum number of lines to backtrack to find an existing
+    // parser instance. This is used to give up in situations where a
+    // highlight would take too long and freeze the browser interface.
+    highlight: function(from, target, cleanLines, maxBacktrack){
+      var container = this.container, self = this, active = this.options.activeTokens;
+      var endTime = (typeof target == "number" ? target : null);
+
+      if (!container.firstChild)
+        return false;
+      // Backtrack to the first node before from that has a partial
+      // parse stored.
+      while (from && (!from.parserFromHere || from.dirty)) {
+        if (maxBacktrack != null && isBR(from) && (--maxBacktrack) < 0)
+          return false;
+        from = from.previousSibling;
+      }
+      // If we are at the end of the document, do nothing.
+      if (from && !from.nextSibling)
+        return false;
+
+      // Check whether a part (<span> node) and the corresponding token
+      // match.
+      function correctPart(token, part){
+        return !part.reduced && part.currentText == token.value && part.className == token.style;
+      }
+      // Shorten the text associated with a part by chopping off
+      // characters from the front. Note that only the currentText
+      // property gets changed. For efficiency reasons, we leave the
+      // nodeValue alone -- we set the reduced flag to indicate that
+      // this part must be replaced.
+      function shortenPart(part, minus){
+        part.currentText = part.currentText.substring(minus);
+        part.reduced = true;
+      }
+      // Create a part corresponding to a given token.
+      function tokenPart(token){
+        var part = makePartSpan(token.value);     
+        part.className = token.style;
+        return part;
+      }
+
+      function maybeTouch(node) {
+        if (node) {
+          var old = node.oldNextSibling;
+          if (lineDirty || old === undefined || node.nextSibling != old)
+            self.history.touch(node);
+          node.oldNextSibling = node.nextSibling;
+        }
+        else {
+          var old = self.container.oldFirstChild;
+          if (lineDirty || old === undefined || self.container.firstChild != old)
+            self.history.touch(null);
+          self.container.oldFirstChild = self.container.firstChild;
+        }
+      }
+
+      // Get the token stream. If from is null, we start with a new
+      // parser from the start of the frame, otherwise a partial parse
+      // is resumed.
+      var traversal = traverseDOM(from ? from.nextSibling : container.firstChild),
+          stream = stringStream(traversal),
+          parsed = from ? from.parserFromHere(stream) : Editor.Parser.make(stream);
+
+      function surroundedByBRs(node) {
+        return (node.previousSibling == null || isBR(node.previousSibling)) &&
+               (node.nextSibling == null || isBR(node.nextSibling));
+      }
+
+      // parts is an interface to make it possible to 'delay' fetching
+      // the next DOM node until we are completely done with the one
+      // before it. This is necessary because often the next node is
+      // not yet available when we want to proceed past the current
+      // one.
+      var parts = {
+        current: null,
+        // Fetch current node.
+        get: function(){
+          if (!this.current)
+            this.current = traversal.nodes.shift();
+          return this.current;
+        },
+        // Advance to the next part (do not fetch it yet).
+        next: function(){
+          this.current = null;
+        },
+        // Remove the current part from the DOM tree, and move to the
+        // next.
+        remove: function(){
+          container.removeChild(this.get());
+          this.current = null;
+        },
+        // Advance to the next part that is not empty, discarding empty
+        // parts.
+        getNonEmpty: function(){
+          var part = this.get();
+          // Allow empty nodes when they are alone on a line, needed
+          // for the FF cursor bug workaround (see select.js,
+          // insertNewlineAtCursor).
+          while (part && isSpan(part) && part.currentText == "") {
+            // Leave empty nodes that are alone on a line alone in
+            // Opera, since that browsers doesn't deal well with
+            // having 2 BRs in a row.
+            if (window.opera && surroundedByBRs(part)) {
+              this.next();
+              part = this.get();
+            }
+            else {
+              var old = part;
+              this.remove();
+              part = this.get();
+              // Adjust selection information, if any. See select.js for details.
+              select.snapshotMove(old.firstChild, part && (part.firstChild || part), 0);
+            }
+          }
+          
+          return part;
+        }
+      };
+
+      var lineDirty = false, prevLineDirty = true, lineNodes = 0;
+
+      // This forEach loops over the tokens from the parsed stream, and
+      // at the same time uses the parts object to proceed through the
+      // corresponding DOM nodes.
+      forEach(parsed, function(token){
+        var part = parts.getNonEmpty();
+
+        if (token.value == "\n"){
+          // The idea of the two streams actually staying synchronized
+          // is such a long shot that we explicitly check.
+          if (!isBR(part))
+            throw "Parser out of sync. Expected BR.";
+
+          if (part.dirty || !part.indentation) lineDirty = true;
+          maybeTouch(from);
+          from = part;
+
+          // Every <br> gets a copy of the parser state and a lexical
+          // context assigned to it. The first is used to be able to
+          // later resume parsing from this point, the second is used
+          // for indentation.
+          part.parserFromHere = parsed.copy();
+          part.indentation = token.indentation || alwaysZero;
+          part.dirty = false;
+
+          // If the target argument wasn't an integer, go at least
+          // until that node.
+          if (endTime == null && part == target) throw StopIteration;
+
+          // A clean line with more than one node means we are done.
+          // Throwing a StopIteration is the way to break out of a
+          // MochiKit forEach loop.
+          if ((endTime != null && time() >= endTime) || (!lineDirty && !prevLineDirty && lineNodes > 1 && !cleanLines))
+            throw StopIteration;
+          prevLineDirty = lineDirty; lineDirty = false; lineNodes = 0;
+          parts.next();
+        }
+        else {
+          if (!isSpan(part))
+            throw "Parser out of sync. Expected SPAN.";
+          if (part.dirty)
+            lineDirty = true;
+          lineNodes++;
+
+          // If the part matches the token, we can leave it alone.
+          if (correctPart(token, part)){
+            if (active && part.dirty) active(part, token, self);
+            part.dirty = false;
+            parts.next();
+          }
+          // Otherwise, we have to fix it.
+          else {
+            lineDirty = true;
+            // Insert the correct part.
+            var newPart = tokenPart(token);
+            container.insertBefore(newPart, part);
+            if (active) active(newPart, token, self);
+            var tokensize = token.value.length;
+            var offset = 0;
+            // Eat up parts until the text for this token has been
+            // removed, adjusting the stored selection info (see
+            // select.js) in the process.
+            while (tokensize > 0) {
+              part = parts.get();
+              var partsize = part.currentText.length;
+              select.snapshotReplaceNode(part.firstChild, newPart.firstChild, tokensize, offset);
+              if (partsize > tokensize){
+                shortenPart(part, tokensize);
+                tokensize = 0;
+              }
+              else {
+                tokensize -= partsize;
+                offset += partsize;
+                parts.remove();
+              }
+            }
+          }
+        }
+      });
+      maybeTouch(from);
+      webkitLastLineHack(this.container);
+
+      // The function returns some status information that is used by
+      // hightlightDirty to determine whether and where it has to
+      // continue.
+      return {node: parts.getNonEmpty(),
+              dirty: lineDirty};
+    }
+  };
+
+  return Editor;
+})();
+
+addEventHandler(window, "load", function() {
+  var CodeMirror = window.frameElement.CodeMirror;
+  var e = CodeMirror.editor = new Editor(CodeMirror.options);
+  parent.setTimeout(method(CodeMirror, "init"), 0);
+});