text: // CodeMirror is the only global var we claim
  window.CodeMirror = (function() {
    "use strict";
  
    // BROWSER SNIFFING
  
    // Crude, but necessary to handle a number of hard-to-feature-detect
    // bugs and behavior differences.
    var gecko = /gecko\/\d/i.test(navigator.userAgent);
    var ie = /MSIE \d/.test(navigator.userAgent);
    var ie_lt8 = ie && (document.documentMode == null || document.documentMode < 8);
    var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);
    var webkit = /WebKit\//.test(navigator.userAgent);
    var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
    var chrome = /Chrome\//.test(navigator.userAgent);
    var opera = /Opera\//.test(navigator.userAgent);
    var safari = /Apple Computer/.test(navigator.vendor);
    var khtml = /KHTML\//.test(navigator.userAgent);
    var mac_geLion = /Mac OS X 1\d\D([7-9]|\d\d)\D/.test(navigator.userAgent);
    var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
    var phantom = /PhantomJS/.test(navigator.userAgent);
  
    var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
    // This is woefully incomplete. Suggestions for alternative methods welcome.
    var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
    var mac = ios || /Mac/.test(navigator.platform);
    var windows = /win/i.test(navigator.platform);
  
    var opera_version = opera && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
    if (opera_version) opera_version = Number(opera_version[1]);
    if (opera_version && opera_version >= 15) { opera = false; webkit = true; }
    // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
    var flipCtrlCmd = mac && (qtwebkit || opera && (opera_version == null || opera_version < 12.11));
    var captureMiddleClick = gecko || (ie && !ie_lt9);
  
    // Optimize some code when these features are not used
    var sawReadOnlySpans = false, sawCollapsedSpans = false;
  
    // CONSTRUCTOR
  
    function CodeMirror(place, options) {
      if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
  
      this.options = options = options || {};
      // Determine effective options based on given values and defaults.
      for (var opt in defaults) if (!options.hasOwnProperty(opt) && defaults.hasOwnProperty(opt))
        options[opt] = defaults[opt];
      setGuttersForLineNumbers(options);
  
      var docStart = typeof options.value == "string" ? 0 : options.value.first;
      var display = this.display = makeDisplay(place, docStart);
      display.wrapper.CodeMirror = this;
      updateGutters(this);
      if (options.autofocus && !mobile) focusInput(this);
  
      this.state = {keyMaps: [],
                    overlays: [],
                    modeGen: 0,
                    overwrite: false, focused: false,
                    suppressEdits: false, pasteIncoming: false,
                    draggingText: false,
                    highlight: new Delayed()};
  
      themeChanged(this);
      if (options.lineWrapping)
        this.display.wrapper.className += " CodeMirror-wrap";
  
      var doc = options.value;
      if (typeof doc == "string") doc = new Doc(options.value, options.mode);
      operation(this, attachDoc)(this, doc);
  
      // Override magic textarea content restore that IE sometimes does
      // on our hidden textarea on reload
      if (ie) setTimeout(bind(resetInput, this, true), 20);
  
      registerEventHandlers(this);
      // IE throws unspecified error in certain cases, when
      // trying to access activeElement before onload
      var hasFocus; try { hasFocus = (document.activeElement == display.input); } catch(e) { }
      if (hasFocus || (options.autofocus && !mobile)) setTimeout(bind(onFocus, this), 20);
      else onBlur(this);
  
      operation(this, function() {
        for (var opt in optionHandlers)
          if (optionHandlers.propertyIsEnumerable(opt))
            optionHandlers[opt](this, options[opt], Init);
        for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
      })();
    }
  
    // DISPLAY CONSTRUCTOR
  
    function makeDisplay(place, docStart) {
      var d = {};
  
      var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none; font-size: 4px;");
      if (webkit) input.style.width = "1000px";
      else input.setAttribute("wrap", "off");
      // if border: 0; -- iOS fails to open keyboard (issue #1287)
      if (ios) input.style.border = "1px solid black";
      input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off"); input.setAttribute("spellcheck", "false");
  
      // Wraps and hides input textarea
      d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
      // The actual fake scrollbars.
      d.scrollbarH = elt("div", [elt("div", null, null, "height: 1px")], "CodeMirror-hscrollbar");
      d.scrollbarV = elt("div", [elt("div", null, null, "width: 1px")], "CodeMirror-vscrollbar");
      d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
      d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
      // DIVs containing the selection and the actual code
      d.lineDiv = elt("div", null, "CodeMirror-code");
      d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
      // Blinky cursor, and element used to ensure cursor fits at the end of a line
      d.cursor = elt("div", "\u00a0", "CodeMirror-cursor");
      // Secondary cursor, shown when on a 'jump' in bi-directional text
      d.otherCursor = elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor");
      // Used to measure text size
      d.measure = elt("div", null, "CodeMirror-measure");
      // Wraps everything that needs to exist inside the vertically-padded coordinate system
      d.lineSpace = elt("div", [d.measure, d.selectionDiv, d.lineDiv, d.cursor, d.otherCursor],
                           null, "position: relative; outline: none");
      // Moved around its parent to cover visible view
      d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
      // Set to the height of the text, causes scrolling
      d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
      // D is needed because behavior of elts with overflow: auto and padding is inconsistent across browsers
      d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerCutOff + "px; width: 1px;");
      // Will contain the gutters, if any
      d.gutters = elt("div", null, "CodeMirror-gutters");
      d.lineGutter = null;
      // Provides scrolling
      d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
      d.scroller.setAttribute("tabIndex", "-1");
      // The element in which the editor lives.
      d.wrapper = elt("div", [d.inputDiv, d.scrollbarH, d.scrollbarV,
                              d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
      // Work around IE7 z-index bug
      if (ie_lt8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
      if (place.appendChild) place.appendChild(d.wrapper); else place(d.wrapper);
  
      // Needed to hide big blue blinking cursor on Mobile Safari
      if (ios) input.style.width = "0px";
      if (!webkit) d.scroller.draggable = true;
      // Needed to handle Tab key in KHTML
      if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }
      // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
      else if (ie_lt8) d.scrollbarH.style.minWidth = d.scrollbarV.style.minWidth = "18px";
  
      // Current visible range (may be bigger than the view window).
      d.viewOffset = d.lastSizeC = 0;
      d.showingFrom = d.showingTo = docStart;
  
      // Used to only resize the line number gutter when necessary (when
      // the amount of lines crosses a boundary that makes its width change)
      d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
      // See readInput and resetInput
      d.prevInput = "";
      // Set to true when a non-horizontal-scrolling widget is added. As
      // an optimization, widget aligning is skipped when d is false.
      d.alignWidgets = false;
      // Flag that indicates whether we currently expect input to appear
      // (after some event like 'keypress' or 'input') and are polling
      // intensively.
      d.pollingFast = false;
      // Self-resetting timeout for the poller
      d.poll = new Delayed();
  
      d.cachedCharWidth = d.cachedTextHeight = null;
      d.measureLineCache = [];
      d.measureLineCachePos = 0;
  
      // Tracks when resetInput has punted to just putting a short
      // string instead of the (large) selection.
      d.inaccurateSelection = false;
  
      // Tracks the maximum line length so that the horizontal scrollbar
      // can be kept static when scrolling.
      d.maxLine = null;
      d.maxLineLength = 0;
      d.maxLineChanged = false;
  
      // Used for measuring wheel scrolling granularity
      d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
  
      return d;
    }
  
    // STATE UPDATES
  
    // Used to get the editor into a consistent state again when options change.
  
    function loadMode(cm) {
      cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
      cm.doc.iter(function(line) {
        if (line.stateAfter) line.stateAfter = null;
        if (line.styles) line.styles = null;
      });
      cm.doc.frontier = cm.doc.first;
      startWorker(cm, 100);
      cm.state.modeGen++;
      if (cm.curOp) regChange(cm);
    }
  
    function wrappingChanged(cm) {
      if (cm.options.lineWrapping) {
        cm.display.wrapper.className += " CodeMirror-wrap";
        cm.display.sizer.style.minWidth = "";
      } else {
        cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-wrap", "");
        computeMaxLength(cm);
      }
      estimateLineHeights(cm);
      regChange(cm);
      clearCaches(cm);
      setTimeout(function(){updateScrollbars(cm);}, 100);
    }
  
    function estimateHeight(cm) {
      var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
      var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
      return function(line) {
        if (lineIsHidden(cm.doc, line))
          return 0;
        else if (wrapping)
          return (Math.ceil(line.text.length / perLine) || 1) * th;
        else
          return th;
      };
    }
  
    function estimateLineHeights(cm) {
      var doc = cm.doc, est = estimateHeight(cm);
      doc.iter(function(line) {
        var estHeight = est(line);
        if (estHeight != line.height) updateLineHeight(line, estHeight);
      });
    }
  
    function keyMapChanged(cm) {
      var map = keyMap[cm.options.keyMap], style = map.style;
      cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
        (style ? " cm-keymap-" + style : "");
      cm.state.disableInput = map.disableInput;
    }
  
    function themeChanged(cm) {
      cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
        cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
      clearCaches(cm);
    }
  
    function guttersChanged(cm) {
      updateGutters(cm);
      regChange(cm);
      setTimeout(function(){alignHorizontally(cm);}, 20);
    }
  
    function updateGutters(cm) {
      var gutters = cm.display.gutters, specs = cm.options.gutters;
      removeChildren(gutters);
      for (var i = 0; i < specs.length; ++i) {
        var gutterClass = specs[i];
        var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
        if (gutterClass == "CodeMirror-linenumbers") {
          cm.display.lineGutter = gElt;
          gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
        }
      }
      gutters.style.display = i ? "" : "none";
    }
  
    function lineLength(doc, line) {
      if (line.height == 0) return 0;
      var len = line.text.length, merged, cur = line;
      while (merged = collapsedSpanAtStart(cur)) {
        var found = merged.find();
        cur = getLine(doc, found.from.line);
        len += found.from.ch - found.to.ch;
      }
      cur = line;
      while (merged = collapsedSpanAtEnd(cur)) {
        var found = merged.find();
        len -= cur.text.length - found.from.ch;
        cur = getLine(doc, found.to.line);
        len += cur.text.length - found.to.ch;
      }
      return len;
    }
  
    function computeMaxLength(cm) {
      var d = cm.display, doc = cm.doc;
      d.maxLine = getLine(doc, doc.first);
      d.maxLineLength = lineLength(doc, d.maxLine);
      d.maxLineChanged = true;
      doc.iter(function(line) {
        var len = lineLength(doc, line);
        if (len > d.maxLineLength) {
          d.maxLineLength = len;
          d.maxLine = line;
        }
      });
    }
  
    // Make sure the gutters options contains the element
    // "CodeMirror-linenumbers" when the lineNumbers option is true.
    function setGuttersForLineNumbers(options) {
      var found = indexOf(options.gutters, "CodeMirror-linenumbers");
      if (found == -1 && options.lineNumbers) {
        options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
      } else if (found > -1 && !options.lineNumbers) {
        options.gutters = options.gutters.slice(0);
        options.gutters.splice(found, 1);
      }
    }
  
    // SCROLLBARS
  
    // Re-synchronize the fake scrollbars with the actual size of the
    // content. Optionally force a scrollTop.
    function updateScrollbars(cm) {
      var d = cm.display, docHeight = cm.doc.height;
      var totalHeight = docHeight + paddingVert(d);
      d.sizer.style.minHeight = d.heightForcer.style.top = totalHeight + "px";
      d.gutters.style.height = Math.max(totalHeight, d.scroller.clientHeight - scrollerCutOff) + "px";
      var scrollHeight = Math.max(totalHeight, d.scroller.scrollHeight);
      var needsH = d.scroller.scrollWidth > (d.scroller.clientWidth + 1);
      var needsV = scrollHeight > (d.scroller.clientHeight + 1);
      if (needsV) {
        d.scrollbarV.style.display = "block";
        d.scrollbarV.style.bottom = needsH ? scrollbarWidth(d.measure) + "px" : "0";
        d.scrollbarV.firstChild.style.height =
          (scrollHeight - d.scroller.clientHeight + d.scrollbarV.clientHeight) + "px";
      } else {
        d.scrollbarV.style.display = "";
        d.scrollbarV.firstChild.style.height = "0";
      }
      if (needsH) {
        d.scrollbarH.style.display = "block";
        d.scrollbarH.style.right = needsV ? scrollbarWidth(d.measure) + "px" : "0";
        d.scrollbarH.firstChild.style.width =
          (d.scroller.scrollWidth - d.scroller.clientWidth + d.scrollbarH.clientWidth) + "px";
      } else {
        d.scrollbarH.style.display = "";
        d.scrollbarH.firstChild.style.width = "0";
      }
      if (needsH && needsV) {
        d.scrollbarFiller.style.display = "block";
        d.scrollbarFiller.style.height = d.scrollbarFiller.style.width = scrollbarWidth(d.measure) + "px";
      } else d.scrollbarFiller.style.display = "";
      if (needsH && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
        d.gutterFiller.style.display = "block";
        d.gutterFiller.style.height = scrollbarWidth(d.measure) + "px";
        d.gutterFiller.style.width = d.gutters.offsetWidth + "px";
      } else d.gutterFiller.style.display = "";
  
      if (mac_geLion && scrollbarWidth(d.measure) === 0) {
        d.scrollbarV.style.minWidth = d.scrollbarH.style.minHeight = mac_geMountainLion ? "18px" : "12px";
        d.scrollbarV.style.pointerEvents = d.scrollbarH.style.pointerEvents = "none";
      }
    }
  
    function visibleLines(display, doc, viewPort) {
      var top = display.scroller.scrollTop, height = display.wrapper.clientHeight;
      if (typeof viewPort == "number") top = viewPort;
      else if (viewPort) {top = viewPort.top; height = viewPort.bottom - viewPort.top;}
      top = Math.floor(top - paddingTop(display));
      var bottom = Math.ceil(top + height);
      return {from: lineAtHeight(doc, top), to: lineAtHeight(doc, bottom)};
    }
  
    // LINE NUMBERS
  
    function alignHorizontally(cm) {
      var display = cm.display;
      if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;
      var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
      var gutterW = display.gutters.offsetWidth, l = comp + "px";
      for (var n = display.lineDiv.firstChild; n; n = n.nextSibling) if (n.alignable) {
        for (var i = 0, a = n.alignable; i < a.length; ++i) a[i].style.left = l;
      }
      if (cm.options.fixedGutter)
        display.gutters.style.left = (comp + gutterW) + "px";
    }
  
    function maybeUpdateLineNumberWidth(cm) {
      if (!cm.options.lineNumbers) return false;
      var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
      if (last.length != display.lineNumChars) {
        var test = display.measure.appendChild(elt("div", [elt("div", last)],
                                                   "CodeMirror-linenumber CodeMirror-gutter-elt"));
        var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
        display.lineGutter.style.width = "";
        display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);
        display.lineNumWidth = display.lineNumInnerWidth + padding;
        display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
        display.lineGutter.style.width = display.lineNumWidth + "px";
        return true;
      }
      return false;
    }
  
    function lineNumberFor(options, i) {
      return String(options.lineNumberFormatter(i + options.firstLineNumber));
    }
    function compensateForHScroll(display) {
      return getRect(display.scroller).left - getRect(display.sizer).left;
    }
  
    // DISPLAY DRAWING
  
    function updateDisplay(cm, changes, viewPort, forced) {
      var oldFrom = cm.display.showingFrom, oldTo = cm.display.showingTo, updated;
      var visible = visibleLines(cm.display, cm.doc, viewPort);
      for (var first = true;; first = false) {
        var oldWidth = cm.display.scroller.clientWidth;
        if (!updateDisplayInner(cm, changes, visible, forced)) break;
        updated = true;
        changes = [];
        updateSelection(cm);
        updateScrollbars(cm);
        if (first && cm.options.lineWrapping && oldWidth != cm.display.scroller.clientWidth) {
          forced = true;
          continue;
        }
        forced = false;
  
        // Clip forced viewport to actual scrollable area
        if (viewPort)
          viewPort = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight,
                              typeof viewPort == "number" ? viewPort : viewPort.top);
        visible = visibleLines(cm.display, cm.doc, viewPort);
        if (visible.from >= cm.display.showingFrom && visible.to <= cm.display.showingTo)
          break;
      }
  
      if (updated) {
        signalLater(cm, "update", cm);
        if (cm.display.showingFrom != oldFrom || cm.display.showingTo != oldTo)
          signalLater(cm, "viewportChange", cm, cm.display.showingFrom, cm.display.showingTo);
      }
      return updated;
    }
  
    // Uses a set of changes plus the current scroll position to
    // determine which DOM updates have to be made, and makes the
    // updates.
    function updateDisplayInner(cm, changes, visible, forced) {
      var display = cm.display, doc = cm.doc;
      if (!display.wrapper.clientWidth) {
        display.showingFrom = display.showingTo = doc.first;
        display.viewOffset = 0;
        return;
      }
  
      // Bail out if the visible area is already rendered and nothing changed.
      if (!forced && changes.length == 0 &&
          visible.from > display.showingFrom && visible.to < display.showingTo)
        return;
  
      if (maybeUpdateLineNumberWidth(cm))
        changes = [{from: doc.first, to: doc.first + doc.size}];
      var gutterW = display.sizer.style.marginLeft = display.gutters.offsetWidth + "px";
      display.scrollbarH.style.left = cm.options.fixedGutter ? gutterW : "0";
  
      // Used to determine which lines need their line numbers updated
      var positionsChangedFrom = Infinity;
      if (cm.options.lineNumbers)
        for (var i = 0; i < changes.length; ++i)
          if (changes[i].diff && changes[i].from < positionsChangedFrom) { positionsChangedFrom = changes[i].from; }
  
      var end = doc.first + doc.size;
      var from = Math.max(visible.from - cm.options.viewportMargin, doc.first);
      var to = Math.min(end, visible.to + cm.options.viewportMargin);
      if (display.showingFrom < from && from - display.showingFrom < 20) from = Math.max(doc.first, display.showingFrom);
      if (display.showingTo > to && display.showingTo - to < 20) to = Math.min(end, display.showingTo);
      if (sawCollapsedSpans) {
        from = lineNo(visualLine(doc, getLine(doc, from)));
        while (to < end && lineIsHidden(doc, getLine(doc, to))) ++to;
      }
  
      // Create a range of theoretically intact lines, and punch holes
      // in that using the change info.
      var intact = [{from: Math.max(display.showingFrom, doc.first),
                     to: Math.min(display.showingTo, end)}];
      if (intact[0].from >= intact[0].to) intact = [];
      else intact = computeIntact(intact, changes);
      // When merged lines are present, we might have to reduce the
      // intact ranges because changes in continued fragments of the
      // intact lines do require the lines to be redrawn.
      if (sawCollapsedSpans)
        for (var i = 0; i < intact.length; ++i) {
          var range = intact[i], merged;
          while (merged = collapsedSpanAtEnd(getLine(doc, range.to - 1))) {
            var newTo = merged.find().from.line;
            if (newTo > range.from) range.to = newTo;
            else { intact.splice(i--, 1); break; }
          }
        }
  
      // Clip off the parts that won't be visible
      var intactLines = 0;
      for (var i = 0; i < intact.length; ++i) {
        var range = intact[i];
        if (range.from < from) range.from = from;
        if (range.to > to) range.to = to;
        if (range.from >= range.to) intact.splice(i--, 1);
        else intactLines += range.to - range.from;
      }
      if (!forced && intactLines == to - from && from == display.showingFrom && to == display.showingTo) {
        updateViewOffset(cm);
        return;
      }
      intact.sort(function(a, b) {return a.from - b.from;});
  
      // Avoid crashing on IE's "unspecified error" when in iframes
      try {
        var focused = document.activeElement;
      } catch(e) {}
      if (intactLines < (to - from) * .7) display.lineDiv.style.display = "none";
      patchDisplay(cm, from, to, intact, positionsChangedFrom);
      display.lineDiv.style.display = "";
      if (focused && document.activeElement != focused && focused.offsetHeight) focused.focus();
  
      var different = from != display.showingFrom || to != display.showingTo ||
        display.lastSizeC != display.wrapper.clientHeight;
      // This is just a bogus formula that detects when the editor is
      // resized or the font size changes.
      if (different) {
        display.lastSizeC = display.wrapper.clientHeight;
        startWorker(cm, 400);
      }
      display.showingFrom = from; display.showingTo = to;
  
      updateHeightsInViewport(cm);
      updateViewOffset(cm);
  
      return true;
    }
  
    function updateHeightsInViewport(cm) {
      var display = cm.display;
      var prevBottom = display.lineDiv.offsetTop;
      for (var node = display.lineDiv.firstChild, height; node; node = node.nextSibling) if (node.lineObj) {
        if (ie_lt8) {
          var bot = node.offsetTop + node.offsetHeight;
          height = bot - prevBottom;
          prevBottom = bot;
        } else {
          var box = getRect(node);
          height = box.bottom - box.top;
        }
        var diff = node.lineObj.height - height;
        if (height < 2) height = textHeight(display);
        if (diff > .001 || diff < -.001) {
          updateLineHeight(node.lineObj, height);
          var widgets = node.lineObj.widgets;
          if (widgets) for (var i = 0; i < widgets.length; ++i)
            widgets[i].height = widgets[i].node.offsetHeight;
        }
      }
    }
  
    function updateViewOffset(cm) {
      var off = cm.display.viewOffset = heightAtLine(cm, getLine(cm.doc, cm.display.showingFrom));
      // Position the mover div to align with the current virtual scroll position
      cm.display.mover.style.top = off + "px";
    }
  
    function computeIntact(intact, changes) {
      for (var i = 0, l = changes.length || 0; i < l; ++i) {
        var change = changes[i], intact2 = [], diff = change.diff || 0;
        for (var j = 0, l2 = intact.length; j < l2; ++j) {
          var range = intact[j];
          if (change.to <= range.from && change.diff) {
            intact2.push({from: range.from + diff, to: range.to + diff});
          } else if (change.to <= range.from || change.from >= range.to) {
            intact2.push(range);
          } else {
            if (change.from > range.from)
              intact2.push({from: range.from, to: change.from});
            if (change.to < range.to)
              intact2.push({from: change.to + diff, to: range.to + diff});
          }
        }
        intact = intact2;
      }
      return intact;
    }
  
    function getDimensions(cm) {
      var d = cm.display, left = {}, width = {};
      for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
        left[cm.options.gutters[i]] = n.offsetLeft;
        width[cm.options.gutters[i]] = n.offsetWidth;
      }
      return {fixedPos: compensateForHScroll(d),
              gutterTotalWidth: d.gutters.offsetWidth,
              gutterLeft: left,
              gutterWidth: width,
              wrapperWidth: d.wrapper.clientWidth};
    }
  
    function patchDisplay(cm, from, to, intact, updateNumbersFrom) {
      var dims = getDimensions(cm);
      var display = cm.display, lineNumbers = cm.options.lineNumbers;
      if (!intact.length && (!webkit || !cm.display.currentWheelTarget))
        removeChildren(display.lineDiv);
      var container = display.lineDiv, cur = container.firstChild;
  
      function rm(node) {
        var next = node.nextSibling;
        if (webkit && mac && cm.display.currentWheelTarget == node) {
          node.style.display = "none";
          node.lineObj = null;
        } else {
          node.parentNode.removeChild(node);
        }
        return next;
      }
  
      var nextIntact = intact.shift(), lineN = from;
      cm.doc.iter(from, to, function(line) {
        if (nextIntact && nextIntact.to == lineN) nextIntact = intact.shift();
        if (lineIsHidden(cm.doc, line)) {
          if (line.height != 0) updateLineHeight(line, 0);
          if (line.widgets && cur && cur.previousSibling) for (var i = 0; i < line.widgets.length; ++i) {
            var w = line.widgets[i];
            if (w.showIfHidden) {
              var prev = cur.previousSibling;
              if (/pre/i.test(prev.nodeName)) {
                var wrap = elt("div", null, null, "position: relative");
                prev.parentNode.replaceChild(wrap, prev);
                wrap.appendChild(prev);
                prev = wrap;
              }
              var wnode = prev.appendChild(elt("div", [w.node], "CodeMirror-linewidget"));
              if (!w.handleMouseEvents) wnode.ignoreEvents = true;
              positionLineWidget(w, wnode, prev, dims);
            }
          }
        } else if (nextIntact && nextIntact.from <= lineN && nextIntact.to > lineN) {
          // This line is intact. Skip to the actual node. Update its
          // line number if needed.
          while (cur.lineObj != line) cur = rm(cur);
          if (lineNumbers && updateNumbersFrom <= lineN && cur.lineNumber)
            setTextContent(cur.lineNumber, lineNumberFor(cm.options, lineN));
          cur = cur.nextSibling;
        } else {
          // For lines with widgets, make an attempt to find and reuse
          // the existing element, so that widgets aren't needlessly
          // removed and re-inserted into the dom
          if (line.widgets) for (var j = 0, search = cur, reuse; search && j < 20; ++j, search = search.nextSibling)
            if (search.lineObj == line && /div/i.test(search.nodeName)) { reuse = search; break; }
          // This line needs to be generated.
          var lineNode = buildLineElement(cm, line, lineN, dims, reuse);
          if (lineNode != reuse) {
            container.insertBefore(lineNode, cur);
          } else {
            while (cur != reuse) cur = rm(cur);
            cur = cur.nextSibling;
          }
  
          lineNode.lineObj = line;
        }
        ++lineN;
      });
      while (cur) cur = rm(cur);
    }
  
    function buildLineElement(cm, line, lineNo, dims, reuse) {
      var built = buildLineContent(cm, line), lineElement = built.pre;
      var markers = line.gutterMarkers, display = cm.display, wrap;
  
      var bgClass = built.bgClass ? built.bgClass + " " + (line.bgClass || "") : line.bgClass;
      if (!cm.options.lineNumbers && !markers && !bgClass && !line.wrapClass && !line.widgets)
        return lineElement;
  
      // Lines with gutter elements, widgets or a background class need
      // to be wrapped again, and have the extra elements added to the
      // wrapper div
  
      if (reuse) {
        reuse.alignable = null;
        var isOk = true, widgetsSeen = 0, insertBefore = null;
        for (var n = reuse.firstChild, next; n; n = next) {
          next = n.nextSibling;
          if (!/\bCodeMirror-linewidget\b/.test(n.className)) {
            reuse.removeChild(n);
          } else {
            for (var i = 0; i < line.widgets.length; ++i) {
              var widget = line.widgets[i];
              if (widget.node == n.firstChild) {
                if (!widget.above && !insertBefore) insertBefore = n;
                positionLineWidget(widget, n, reuse, dims);
                ++widgetsSeen;
                break;
              }
            }
            if (i == line.widgets.length) { isOk = false; break; }
          }
        }
        reuse.insertBefore(lineElement, insertBefore);
        if (isOk && widgetsSeen == line.widgets.length) {
          wrap = reuse;
          reuse.className = line.wrapClass || "";
        }
      }
      if (!wrap) {
        wrap = elt("div", null, line.wrapClass, "position: relative");
        wrap.appendChild(lineElement);
      }
      // Kludge to make sure the styled element lies behind the selection (by z-index)
      if (bgClass)
        wrap.insertBefore(elt("div", null, bgClass + " CodeMirror-linebackground"), wrap.firstChild);
      if (cm.options.lineNumbers || markers) {
        var gutterWrap = wrap.insertBefore(elt("div", null, null, "position: absolute; left: " +
                                               (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"),
                                           wrap.firstChild);
        if (cm.options.fixedGutter) (wrap.alignable || (wrap.alignable = [])).push(gutterWrap);
        if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
          wrap.lineNumber = gutterWrap.appendChild(
            elt("div", lineNumberFor(cm.options, lineNo),
                "CodeMirror-linenumber CodeMirror-gutter-elt",
                "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
                + display.lineNumInnerWidth + "px"));
        if (markers)
          for (var k = 0; k < cm.options.gutters.length; ++k) {
            var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
            if (found)
              gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
                                         dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
          }
      }
      if (ie_lt8) wrap.style.zIndex = 2;
      if (line.widgets && wrap != reuse) for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
        var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
        if (!widget.handleMouseEvents) node.ignoreEvents = true;
        positionLineWidget(widget, node, wrap, dims);
        if (widget.above)
          wrap.insertBefore(node, cm.options.lineNumbers && line.height != 0 ? gutterWrap : lineElement);
        else
          wrap.appendChild(node);
        signalLater(widget, "redraw");
      }
      return wrap;
    }
  
    function positionLineWidget(widget, node, wrap, dims) {
      if (widget.noHScroll) {
        (wrap.alignable || (wrap.alignable = [])).push(node);
        var width = dims.wrapperWidth;
        node.style.left = dims.fixedPos + "px";
        if (!widget.coverGutter) {
          width -= dims.gutterTotalWidth;
          node.style.paddingLeft = dims.gutterTotalWidth + "px";
        }
        node.style.width = width + "px";
      }
      if (widget.coverGutter) {
        node.style.zIndex = 5;
        node.style.position = "relative";
        if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";
      }
    }
  
    // SELECTION / CURSOR
  
    function updateSelection(cm) {
      var display = cm.display;
      var collapsed = posEq(cm.doc.sel.from, cm.doc.sel.to);
      if (collapsed || cm.options.showCursorWhenSelecting)
        updateSelectionCursor(cm);
      else
        display.cursor.style.display = display.otherCursor.style.display = "none";
      if (!collapsed)
        updateSelectionRange(cm);
      else
        display.selectionDiv.style.display = "none";
  
      // Move the hidden textarea near the cursor to prevent scrolling artifacts
      if (cm.options.moveInputWithCursor) {
        var headPos = cursorCoords(cm, cm.doc.sel.head, "div");
        var wrapOff = getRect(display.wrapper), lineOff = getRect(display.lineDiv);
        display.inputDiv.style.top = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
                                                          headPos.top + lineOff.top - wrapOff.top)) + "px";
        display.inputDiv.style.left = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
                                                           headPos.left + lineOff.left - wrapOff.left)) + "px";
      }
    }
  
    // No selection, plain cursor
    function updateSelectionCursor(cm) {
      var display = cm.display, pos = cursorCoords(cm, cm.doc.sel.head, "div");
      display.cursor.style.left = pos.left + "px";
      display.cursor.style.top = pos.top + "px";
      display.cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
      display.cursor.style.display = "";
  
      if (pos.other) {
        display.otherCursor.style.display = "";
        display.otherCursor.style.left = pos.other.left + "px";
        display.otherCursor.style.top = pos.other.top + "px";
        display.otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
      } else { display.otherCursor.style.display = "none"; }
    }
  
    // Highlight selection
    function updateSelectionRange(cm) {
      var display = cm.display, doc = cm.doc, sel = cm.doc.sel;
      var fragment = document.createDocumentFragment();
      var clientWidth = display.lineSpace.offsetWidth, pl = paddingLeft(cm.display);
  
      function add(left, top, width, bottom) {
        if (top < 0) top = 0;
        fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
                                 "px; top: " + top + "px; width: " + (width == null ? clientWidth - left : width) +
                                 "px; height: " + (bottom - top) + "px"));
      }
  
      function drawForLine(line, fromArg, toArg) {
        var lineObj = getLine(doc, line);
        var lineLen = lineObj.text.length;
        var start, end;
        function coords(ch, bias) {
          return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
        }
  
        iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {
          var leftPos = coords(from, "left"), rightPos, left, right;
          if (from == to) {
            rightPos = leftPos;
            left = right = leftPos.left;
          } else {
            rightPos = coords(to - 1, "right");
            if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
            left = leftPos.left;
            right = rightPos.right;
          }
          if (fromArg == null && from == 0) left = pl;
          if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
            add(left, leftPos.top, null, leftPos.bottom);
            left = pl;
            if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
          }
          if (toArg == null && to == lineLen) right = clientWidth;
          if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
            start = leftPos;
          if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
            end = rightPos;
          if (left < pl + 1) left = pl;
          add(left, rightPos.top, right - left, rightPos.bottom);
        });
        return {start: start, end: end};
      }
  
      if (sel.from.line == sel.to.line) {
        drawForLine(sel.from.line, sel.from.ch, sel.to.ch);
      } else {
        var fromLine = getLine(doc, sel.from.line), toLine = getLine(doc, sel.to.line);
        var singleVLine = visualLine(doc, fromLine) == visualLine(doc, toLine);
        var leftEnd = drawForLine(sel.from.line, sel.from.ch, singleVLine ? fromLine.text.length : null).end;
        var rightStart = drawForLine(sel.to.line, singleVLine ? 0 : null, sel.to.ch).start;
        if (singleVLine) {
          if (leftEnd.top < rightStart.top - 2) {
            add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
            add(pl, rightStart.top, rightStart.left, rightStart.bottom);
          } else {
            add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
          }
        }
        if (leftEnd.bottom < rightStart.top)
          add(pl, leftEnd.bottom, null, rightStart.top);
      }
  
      removeChildrenAndAdd(display.selectionDiv, fragment);
      display.selectionDiv.style.display = "";
    }
  
    // Cursor-blinking
    function restartBlink(cm) {
      if (!cm.state.focused) return;
      var display = cm.display;
      clearInterval(display.blinker);
      var on = true;
      display.cursor.style.visibility = display.otherCursor.style.visibility = "";
      if (cm.options.cursorBlinkRate > 0)
        display.blinker = setInterval(function() {
          display.cursor.style.visibility = display.otherCursor.style.visibility = (on = !on) ? "" : "hidden";
        }, cm.options.cursorBlinkRate);
    }
  
    // HIGHLIGHT WORKER
  
    function startWorker(cm, time) {
      if (cm.doc.mode.startState && cm.doc.frontier < cm.display.showingTo)
        cm.state.highlight.set(time, bind(highlightWorker, cm));
    }
  
    function highlightWorker(cm) {
      var doc = cm.doc;
      if (doc.frontier < doc.first) doc.frontier = doc.first;
      if (doc.frontier >= cm.display.showingTo) return;
      var end = +new Date + cm.options.workTime;
      var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
      var changed = [], prevChange;
      doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.showingTo + 500), function(line) {
        if (doc.frontier >= cm.display.showingFrom) { // Visible
          var oldStyles = line.styles;
          line.styles = highlightLine(cm, line, state);
          var ischange = !oldStyles || oldStyles.length != line.styles.length;
          for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
          if (ischange) {
            if (prevChange && prevChange.end == doc.frontier) prevChange.end++;
            else changed.push(prevChange = {start: doc.frontier, end: doc.frontier + 1});
          }
          line.stateAfter = copyState(doc.mode, state);
        } else {
          processLine(cm, line, state);
          line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
        }
        ++doc.frontier;
        if (+new Date > end) {
          startWorker(cm, cm.options.workDelay);
          return true;
        }
      });
      if (changed.length)
        operation(cm, function() {
          for (var i = 0; i < changed.length; ++i)
            regChange(this, changed[i].start, changed[i].end);
        })();
    }
  
    // Finds the line to start with when starting a parse. Tries to
    // find a line with a stateAfter, so that it can start with a
    // valid state. If that fails, it returns the line with the
    // smallest indentation, which tends to need the least context to
    // parse correctly.
    function findStartLine(cm, n, precise) {
      var minindent, minline, doc = cm.doc;
      var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
      for (var search = n; search > lim; --search) {
        if (search <= doc.first) return doc.first;
        var line = getLine(doc, search - 1);
        if (line.stateAfter && (!precise || search <= doc.frontier)) return search;
        var indented = countColumn(line.text, null, cm.options.tabSize);
        if (minline == null || minindent > indented) {
          minline = search - 1;
          minindent = indented;
        }
      }
      return minline;
    }
  
    function getStateBefore(cm, n, precise) {
      var doc = cm.doc, display = cm.display;
      if (!doc.mode.startState) return true;
      var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter;
      if (!state) state = startState(doc.mode);
      else state = copyState(doc.mode, state);
      doc.iter(pos, n, function(line) {
        processLine(cm, line, state);
        var save = pos == n - 1 || pos % 5 == 0 || pos >= display.showingFrom && pos < display.showingTo;
        line.stateAfter = save ? copyState(doc.mode, state) : null;
        ++pos;
      });
      if (precise) doc.frontier = pos;
      return state;
    }
  
    // POSITION MEASUREMENT
  
    function paddingTop(display) {return display.lineSpace.offsetTop;}
    function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}
    function paddingLeft(display) {
      var e = removeChildrenAndAdd(display.measure, elt("pre", null, null, "text-align: left")).appendChild(elt("span", "x"));
      return e.offsetLeft;
    }
  
    function measureChar(cm, line, ch, data, bias) {
      var dir = -1;
      data = data || measureLine(cm, line);
      if (data.crude) {
        var left = data.left + ch * data.width;
        return {left: left, right: left + data.width, top: data.top, bottom: data.bottom};
      }
  
      for (var pos = ch;; pos += dir) {
        var r = data[pos];
        if (r) break;
        if (dir < 0 && pos == 0) dir = 1;
      }
      bias = pos > ch ? "left" : pos < ch ? "right" : bias;
      if (bias == "left" && r.leftSide) r = r.leftSide;
      else if (bias == "right" && r.rightSide) r = r.rightSide;
      return {left: pos < ch ? r.right : r.left,
              right: pos > ch ? r.left : r.right,
              top: r.top,
              bottom: r.bottom};
    }
  
    function findCachedMeasurement(cm, line) {
      var cache = cm.display.measureLineCache;
      for (var i = 0; i < cache.length; ++i) {
        var memo = cache[i];
        if (memo.text == line.text && memo.markedSpans == line.markedSpans &&
            cm.display.scroller.clientWidth == memo.width &&
            memo.classes == line.textClass + "|" + line.wrapClass)
          return memo;
      }
    }
  
    function clearCachedMeasurement(cm, line) {
      var exists = findCachedMeasurement(cm, line);
      if (exists) exists.text = exists.measure = exists.markedSpans = null;
    }
  
    function measureLine(cm, line) {
      // First look in the cache
      var cached = findCachedMeasurement(cm, line);
      if (cached) return cached.measure;
  
      // Failing that, recompute and store result in cache
      var measure = measureLineInner(cm, line);
      var cache = cm.display.measureLineCache;
      var memo = {text: line.text, width: cm.display.scroller.clientWidth,
                  markedSpans: line.markedSpans, measure: measure,
                  classes: line.textClass + "|" + line.wrapClass};
      if (cache.length == 16) cache[++cm.display.measureLineCachePos % 16] = memo;
      else cache.push(memo);
      return measure;
    }
  
    function measureLineInner(cm, line) {
      if (!cm.options.lineWrapping && line.text.length >= cm.options.crudeMeasuringFrom)
        return crudelyMeasureLine(cm, line);
  
      var display = cm.display, measure = emptyArray(line.text.length);
      var pre = buildLineContent(cm, line, measure, true).pre;
  
      // IE does not cache element positions of inline elements between
      // calls to getBoundingClientRect. This makes the loop below,
      // which gathers the positions of all the characters on the line,
      // do an amount of layout work quadratic to the number of
      // characters. When line wrapping is off, we try to improve things
      // by first subdividing the line into a bunch of inline blocks, so
      // that IE can reuse most of the layout information from caches
      // for those blocks. This does interfere with line wrapping, so it
      // doesn't work when wrapping is on, but in that case the
      // situation is slightly better, since IE does cache line-wrapping
      // information and only recomputes per-line.
      if (ie && !ie_lt8 && !cm.options.lineWrapping && pre.childNodes.length > 100) {
        var fragment = document.createDocumentFragment();
        var chunk = 10, n = pre.childNodes.length;
        for (var i = 0, chunks = Math.ceil(n / chunk); i < chunks; ++i) {
          var wrap = elt("div", null, null, "display: inline-block");
          for (var j = 0; j < chunk && n; ++j) {
            wrap.appendChild(pre.firstChild);
            --n;
          }
          fragment.appendChild(wrap);
        }
        pre.appendChild(fragment);
      }
  
      removeChildrenAndAdd(display.measure, pre);
  
      var outer = getRect(display.lineDiv);
      var vranges = [], data = emptyArray(line.text.length), maxBot = pre.offsetHeight;
      // Work around an IE7/8 bug where it will sometimes have randomly
      // replaced our pre with a clone at this point.
      if (ie_lt9 && display.measure.first != pre)
        removeChildrenAndAdd(display.measure, pre);
  
      function measureRect(rect) {
        var top = rect.top - outer.top, bot = rect.bottom - outer.top;
        if (bot > maxBot) bot = maxBot;
        if (top < 0) top = 0;
        for (var i = vranges.length - 2; i >= 0; i -= 2) {
          var rtop = vranges[i], rbot = vranges[i+1];
          if (rtop > bot || rbot < top) continue;
          if (rtop <= top && rbot >= bot ||
              top <= rtop && bot >= rbot ||
              Math.min(bot, rbot) - Math.max(top, rtop) >= (bot - top) >> 1) {
            vranges[i] = Math.min(top, rtop);
            vranges[i+1] = Math.max(bot, rbot);
            break;
          }
        }
        if (i < 0) { i = vranges.length; vranges.push(top, bot); }
        return {left: rect.left - outer.left,
                right: rect.right - outer.left,
                top: i, bottom: null};
      }
      function finishRect(rect) {
        rect.bottom = vranges[rect.top+1];
        rect.top = vranges[rect.top];
      }
  
      for (var i = 0, cur; i < measure.length; ++i) if (cur = measure[i]) {
        var node = cur, rect = null;
        // A widget might wrap, needs special care
        if (/\bCodeMirror-widget\b/.test(cur.className) && cur.getClientRects) {
          if (cur.firstChild.nodeType == 1) node = cur.firstChild;
          var rects = node.getClientRects();
          if (rects.length > 1) {
            rect = data[i] = measureRect(rects[0]);
            rect.rightSide = measureRect(rects[rects.length - 1]);
          }
        }
        if (!rect) rect = data[i] = measureRect(getRect(node));
        if (cur.measureRight) rect.right = getRect(cur.measureRight).left;
        if (cur.leftSide) rect.leftSide = measureRect(getRect(cur.leftSide));
      }
      removeChildren(cm.display.measure);
      for (var i = 0, cur; i < data.length; ++i) if (cur = data[i]) {
        finishRect(cur);
        if (cur.leftSide) finishRect(cur.leftSide);
        if (cur.rightSide) finishRect(cur.rightSide);
      }
      return data;
    }
  
    function crudelyMeasureLine(cm, line) {
      var copy = new Line(line.text.slice(0, 100), null);
      if (line.textClass) copy.textClass = line.textClass;
      var measure = measureLineInner(cm, copy);
      var left = measureChar(cm, copy, 0, measure, "left");
      var right = measureChar(cm, copy, 99, measure, "right");
      return {crude: true, top: left.top, left: left.left, bottom: left.bottom, width: (right.right - left.left) / 100};
    }
  
    function measureLineWidth(cm, line) {
      var hasBadSpan = false;
      if (line.markedSpans) for (var i = 0; i < line.markedSpans; ++i) {
        var sp = line.markedSpans[i];
        if (sp.collapsed && (sp.to == null || sp.to == line.text.length)) hasBadSpan = true;
      }
      var cached = !hasBadSpan && findCachedMeasurement(cm, line);
      if (cached || line.text.length >= cm.options.crudeMeasuringFrom)
        return measureChar(cm, line, line.text.length, cached && cached.measure, "right").right;
  
      var pre = buildLineContent(cm, line, null, true).pre;
      var end = pre.appendChild(zeroWidthElement(cm.display.measure));
      removeChildrenAndAdd(cm.display.measure, pre);
      return getRect(end).right - getRect(cm.display.lineDiv).left;
    }
  
    function clearCaches(cm) {
      cm.display.measureLineCache.length = cm.display.measureLineCachePos = 0;
      cm.display.cachedCharWidth = cm.display.cachedTextHeight = null;
      if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;
      cm.display.lineNumChars = null;
    }
  
    function pageScrollX() { return window.pageXOffset || (document.documentElement || document.body).scrollLeft; }
    function pageScrollY() { return window.pageYOffset || (document.documentElement || document.body).scrollTop; }
  
    // Context is one of "line", "div" (display.lineDiv), "local"/null (editor), or "page"
    function intoCoordSystem(cm, lineObj, rect, context) {
      if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {
        var size = widgetHeight(lineObj.widgets[i]);
        rect.top += size; rect.bottom += size;
      }
      if (context == "line") return rect;
      if (!context) context = "local";
      var yOff = heightAtLine(cm, lineObj);
      if (context == "local") yOff += paddingTop(cm.display);
      else yOff -= cm.display.viewOffset;
      if (context == "page" || context == "window") {
        var lOff = getRect(cm.display.lineSpace);
        yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
        var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
        rect.left += xOff; rect.right += xOff;
      }
      rect.top += yOff; rect.bottom += yOff;
      return rect;
    }
  
    // Context may be "window", "page", "div", or "local"/null
    // Result is in "div" coords
    function fromCoordSystem(cm, coords, context) {
      if (context == "div") return coords;
      var left = coords.left, top = coords.top;
      // First move into "page" coordinate system
      if (context == "page") {
        left -= pageScrollX();
        top -= pageScrollY();
      } else if (context == "local" || !context) {
        var localBox = getRect(cm.display.sizer);
        left += localBox.left;
        top += localBox.top;
      }
  
      var lineSpaceBox = getRect(cm.display.lineSpace);
      return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top};
    }
  
    function charCoords(cm, pos, context, lineObj, bias) {
      if (!lineObj) lineObj = getLine(cm.doc, pos.line);
      return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, null, bias), context);
    }
  
    function cursorCoords(cm, pos, context, lineObj, measurement) {
      lineObj = lineObj || getLine(cm.doc, pos.line);
      if (!measurement) measurement = measureLine(cm, lineObj);
      function get(ch, right) {
        var m = measureChar(cm, lineObj, ch, measurement, right ? "right" : "left");
        if (right) m.left = m.right; else m.right = m.left;
        return intoCoordSystem(cm, lineObj, m, context);
      }
      function getBidi(ch, partPos) {
        var part = order[partPos], right = part.level % 2;
        if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {
          part = order[--partPos];
          ch = bidiRight(part) - (part.level % 2 ? 0 : 1);
          right = true;
        } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {
          part = order[++partPos];
          ch = bidiLeft(part) - part.level % 2;
          right = false;
        }
        if (right && ch == part.to && ch > part.from) return get(ch - 1);
        return get(ch, right);
      }
      var order = getOrder(lineObj), ch = pos.ch;
      if (!order) return get(ch);
      var partPos = getBidiPartAt(order, ch);
      var val = getBidi(ch, partPos);
      if (bidiOther != null) val.other = getBidi(ch, bidiOther);
      return val;
    }
  
    function PosWithInfo(line, ch, outside, xRel) {
      var pos = new Pos(line, ch);
      pos.xRel = xRel;
      if (outside) pos.outside = true;
      return pos;
    }
  
    // Coords must be lineSpace-local
    function coordsChar(cm, x, y) {
      var doc = cm.doc;
      y += cm.display.viewOffset;
      if (y < 0) return PosWithInfo(doc.first, 0, true, -1);
      var lineNo = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
      if (lineNo > last)
        return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
      if (x < 0) x = 0;
  
      for (;;) {
        var lineObj = getLine(doc, lineNo);
        var found = coordsCharInner(cm, lineObj, lineNo, x, y);
        var merged = collapsedSpanAtEnd(lineObj);
        var mergedPos = merged && merged.find();
        if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
          lineNo = mergedPos.to.line;
        else
          return found;
      }
    }
  
    function coordsCharInner(cm, lineObj, lineNo, x, y) {
      var innerOff = y - heightAtLine(cm, lineObj);
      var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
      var measurement = measureLine(cm, lineObj);
  
      function getX(ch) {
        var sp = cursorCoords(cm, Pos(lineNo, ch), "line",
                              lineObj, measurement);
        wrongLine = true;
        if (innerOff > sp.bottom) return sp.left - adjust;
        else if (innerOff < sp.top) return sp.left + adjust;
        else wrongLine = false;
        return sp.left;
      }
  
      var bidi = getOrder(lineObj), dist = lineObj.text.length;
      var from = lineLeft(lineObj), to = lineRight(lineObj);
      var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
  
      if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);
      // Do a binary search between these bounds.
      for (;;) {
        if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
          var ch = x < fromX || x - fromX <= toX - x ? from : to;
          var xDiff = x - (ch == from ? fromX : toX);
          while (isExtendingChar.test(lineObj.text.charAt(ch))) ++ch;
          var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
                                xDiff < 0 ? -1 : xDiff ? 1 : 0);
          return pos;
        }
        var step = Math.ceil(dist / 2), middle = from + step;
        if (bidi) {
          middle = from;
          for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
        }
        var middleX = getX(middle);
        if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
        else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
      }
    }
  
    var measureText;
    function textHeight(display) {
      if (display.cachedTextHeight != null) return display.cachedTextHeight;
      if (measureText == null) {
        measureText = elt("pre");
        // Measure a bunch of lines, for browsers that compute
        // fractional heights.
        for (var i = 0; i < 49; ++i) {
          measureText.appendChild(document.createTextNode("x"));
          measureText.appendChild(elt("br"));
        }
        measureText.appendChild(document.createTextNode("x"));
      }
      removeChildrenAndAdd(display.measure, measureText);
      var height = measureText.offsetHeight / 50;
      if (height > 3) display.cachedTextHeight = height;
      removeChildren(display.measure);
      return height || 1;
    }
  
    function charWidth(display) {
      if (display.cachedCharWidth != null) return display.cachedCharWidth;
      var anchor = elt("span", "x");
      var pre = elt("pre", [anchor]);
      removeChildrenAndAdd(display.measure, pre);
      var width = anchor.offsetWidth;
      if (width > 2) display.cachedCharWidth = width;
      return width || 10;
    }
  
    // OPERATIONS
  
    // Operations are used to wrap changes in such a way that each
    // change won't have to update the cursor and display (which would
    // be awkward, slow, and error-prone), but instead updates are
    // batched and then all combined and executed at once.
  
    var nextOpId = 0;
    function startOperation(cm) {
      cm.curOp = {
        // An array of ranges of lines that have to be updated. See
        // updateDisplay.
        changes: [],
        forceUpdate: false,
        updateInput: null,
        userSelChange: null,
        textChanged: null,
        selectionChanged: false,
        cursorActivity: false,
        updateMaxLine: false,
        updateScrollPos: false,
        id: ++nextOpId
      };
      if (!delayedCallbackDepth++) delayedCallbacks = [];
    }
  
    function endOperation(cm) {
      var op = cm.curOp, doc = cm.doc, display = cm.display;
      cm.curOp = null;
  
      if (op.updateMaxLine) computeMaxLength(cm);
      if (display.maxLineChanged && !cm.options.lineWrapping && display.maxLine) {
        var width = measureLineWidth(cm, display.maxLine);
        display.sizer.style.minWidth = Math.max(0, width + 3 + scrollerCutOff) + "px";
        display.maxLineChanged = false;
        var maxScrollLeft = Math.max(0, display.sizer.offsetLeft + display.sizer.offsetWidth - display.scroller.clientWidth);
        if (maxScrollLeft < doc.scrollLeft && !op.updateScrollPos)
          setScrollLeft(cm, Math.min(display.scroller.scrollLeft, maxScrollLeft), true);
      }
      var newScrollPos, updated;
      if (op.updateScrollPos) {
        newScrollPos = op.updateScrollPos;
      } else if (op.selectionChanged && display.scroller.clientHeight) { // don't rescroll if not visible
        var coords = cursorCoords(cm, doc.sel.head);
        newScrollPos = calculateScrollPos(cm, coords.left, coords.top, coords.left, coords.bottom);
      }
      if (op.changes.length || op.forceUpdate || newScrollPos && newScrollPos.scrollTop != null) {
        updated = updateDisplay(cm, op.changes, newScrollPos && newScrollPos.scrollTop, op.forceUpdate);
        if (cm.display.scroller.offsetHeight) cm.doc.scrollTop = cm.display.scroller.scrollTop;
      }
      if (!updated && op.selectionChanged) updateSelection(cm);
      if (op.updateScrollPos) {
        display.scroller.scrollTop = display.scrollbarV.scrollTop = doc.scrollTop = newScrollPos.scrollTop;
        display.scroller.scrollLeft = display.scrollbarH.scrollLeft = doc.scrollLeft = newScrollPos.scrollLeft;
        alignHorizontally(cm);
        if (op.scrollToPos)
          scrollPosIntoView(cm, clipPos(cm.doc, op.scrollToPos.from),
                            clipPos(cm.doc, op.scrollToPos.to), op.scrollToPos.margin);
      } else if (newScrollPos) {
        scrollCursorIntoView(cm);
      }
      if (op.selectionChanged) restartBlink(cm);
  
      if (cm.state.focused && op.updateInput)
        resetInput(cm, op.userSelChange);
  
      var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
      if (hidden) for (var i = 0; i < hidden.length; ++i)
        if (!hidden[i].lines.length) signal(hidden[i], "hide");
      if (unhidden) for (var i = 0; i < unhidden.length; ++i)
        if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
  
      var delayed;
      if (!--delayedCallbackDepth) {
        delayed = delayedCallbacks;
        delayedCallbacks = null;
      }
      if (op.textChanged)
        signal(cm, "change", cm, op.textChanged);
      if (op.cursorActivity) signal(cm, "cursorActivity", cm);
      if (delayed) for (var i = 0; i < delayed.length; ++i) delayed[i]();
    }
  
    // Wraps a function in an operation. Returns the wrapped function.
    function operation(cm1, f) {
      return function() {
        var cm = cm1 || this, withOp = !cm.curOp;
        if (withOp) startOperation(cm);
        try { var result = f.apply(cm, arguments); }
        finally { if (withOp) endOperation(cm); }
        return result;
      };
    }
    function docOperation(f) {
      return function() {
        var withOp = this.cm && !this.cm.curOp, result;
        if (withOp) startOperation(this.cm);
        try { result = f.apply(this, arguments); }
        finally { if (withOp) endOperation(this.cm); }
        return result;
      };
    }
    function runInOp(cm, f) {
      var withOp = !cm.curOp, result;
      if (withOp) startOperation(cm);
      try { result = f(); }
      finally { if (withOp) endOperation(cm); }
      return result;
    }
  
    function regChange(cm, from, to, lendiff) {
      if (from == null) from = cm.doc.first;
      if (to == null) to = cm.doc.first + cm.doc.size;
      cm.curOp.changes.push({from: from, to: to, diff: lendiff});
    }
  
    // INPUT HANDLING
  
    function slowPoll(cm) {
      if (cm.display.pollingFast) return;
      cm.display.poll.set(cm.options.pollInterval, function() {
        readInput(cm);
        if (cm.state.focused) slowPoll(cm);
      });
    }
  
    function fastPoll(cm) {
      var missed = false;
      cm.display.pollingFast = true;
      function p() {
        var changed = readInput(cm);
        if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}
        else {cm.display.pollingFast = false; slowPoll(cm);}
      }
      cm.display.poll.set(20, p);
    }
  
    // prevInput is a hack to work with IME. If we reset the textarea
    // on every change, that breaks IME. So we look for changes
    // compared to the previous content instead. (Modern browsers have
    // events that indicate IME taking place, but these are not widely
    // supported or compatible enough yet to rely on.)
    function readInput(cm) {
      var input = cm.display.input, prevInput = cm.display.prevInput, doc = cm.doc, sel = doc.sel;
      if (!cm.state.focused || hasSelection(input) || isReadOnly(cm) || cm.state.disableInput) return false;
      if (cm.state.pasteIncoming && cm.state.fakedLastChar) {
        input.value = input.value.substring(0, input.value.length - 1);
        cm.state.fakedLastChar = false;
      }
      var text = input.value;
      if (text == prevInput && posEq(sel.from, sel.to)) return false;
      if (ie && !ie_lt9 && cm.display.inputHasSelection === text) {
        resetInput(cm, true);
        return false;
      }
  
      var withOp = !cm.curOp;
      if (withOp) startOperation(cm);
      sel.shift = false;
      var same = 0, l = Math.min(prevInput.length, text.length);
      while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
      var from = sel.from, to = sel.to;
      if (same < prevInput.length)
        from = Pos(from.line, from.ch - (prevInput.length - same));
      else if (cm.state.overwrite && posEq(from, to) && !cm.state.pasteIncoming)
        to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + (text.length - same)));
  
      var updateInput = cm.curOp.updateInput;
      var changeEvent = {from: from, to: to, text: splitLines(text.slice(same)),
                         origin: cm.state.pasteIncoming ? "paste" : "+input"};
      makeChange(cm.doc, changeEvent, "end");
      cm.curOp.updateInput = updateInput;
      signalLater(cm, "inputRead", cm, changeEvent);
  
      if (text.length > 1000 || text.indexOf("\n") > -1) input.value = cm.display.prevInput = "";
      else cm.display.prevInput = text;
      if (withOp) endOperation(cm);
      cm.state.pasteIncoming = false;
      return true;
    }
  
    function resetInput(cm, user) {
      var minimal, selected, doc = cm.doc;
      if (!posEq(doc.sel.from, doc.sel.to)) {
        cm.display.prevInput = "";
        minimal = hasCopyEvent &&
          (doc.sel.to.line - doc.sel.from.line > 100 || (selected = cm.getSelection()).length > 1000);
        var content = minimal ? "-" : selected || cm.getSelection();
        cm.display.input.value = content;
        if (cm.state.focused) selectInput(cm.display.input);
        if (ie && !ie_lt9) cm.display.inputHasSelection = content;
      } else if (user) {
        cm.display.prevInput = cm.display.input.value = "";
        if (ie && !ie_lt9) cm.display.inputHasSelection = null;
      }
      cm.display.inaccurateSelection = minimal;
    }
  
    function focusInput(cm) {
      if (cm.options.readOnly != "nocursor" && (!mobile || document.activeElement != cm.display.input))
        cm.display.input.focus();
    }
  
    function isReadOnly(cm) {
      return cm.options.readOnly || cm.doc.cantEdit;
    }
  
    // EVENT HANDLERS
  
    function registerEventHandlers(cm) {
      var d = cm.display;
      on(d.scroller, "mousedown", operation(cm, onMouseDown));
      if (ie)
        on(d.scroller, "dblclick", operation(cm, function(e) {
          if (signalDOMEvent(cm, e)) return;
          var pos = posFromMouse(cm, e);
          if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
          e_preventDefault(e);
          var word = findWordAt(getLine(cm.doc, pos.line).text, pos);
          extendSelection(cm.doc, word.from, word.to);
        }));
      else
        on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });
      on(d.lineSpace, "selectstart", function(e) {
        if (!eventInWidget(d, e)) e_preventDefault(e);
      });
      // Gecko browsers fire contextmenu *after* opening the menu, at
      // which point we can't mess with it anymore. Context menu is
      // handled in onMouseDown for Gecko.
      if (!captureMiddleClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
  
      on(d.scroller, "scroll", function() {
        if (d.scroller.clientHeight) {
          setScrollTop(cm, d.scroller.scrollTop);
          setScrollLeft(cm, d.scroller.scrollLeft, true);
          signal(cm, "scroll", cm);
        }
      });
      on(d.scrollbarV, "scroll", function() {
        if (d.scroller.clientHeight) setScrollTop(cm, d.scrollbarV.scrollTop);
      });
      on(d.scrollbarH, "scroll", function() {
        if (d.scroller.clientHeight) setScrollLeft(cm, d.scrollbarH.scrollLeft);
      });
  
      on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
      on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
  
      function reFocus() { if (cm.state.focused) setTimeout(bind(focusInput, cm), 0); }
      on(d.scrollbarH, "mousedown", reFocus);
      on(d.scrollbarV, "mousedown", reFocus);
      // Prevent wrapper from ever scrolling
      on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
  
      var resizeTimer;
      function onResize() {
        if (resizeTimer == null) resizeTimer = setTimeout(function() {
          resizeTimer = null;
          // Might be a text scaling operation, clear size caches.
          d.cachedCharWidth = d.cachedTextHeight = knownScrollbarWidth = null;
          clearCaches(cm);
          runInOp(cm, bind(regChange, cm));
        }, 100);
      }
      on(window, "resize", onResize);
      // Above handler holds on to the editor and its data structures.
      // Here we poll to unregister it when the editor is no longer in
      // the document, so that it can be garbage-collected.
      function unregister() {
        for (var p = d.wrapper.parentNode; p && p != document.body; p = p.parentNode) {}
        if (p) setTimeout(unregister, 5000);
        else off(window, "resize", onResize);
      }
      setTimeout(unregister, 5000);
  
      on(d.input, "keyup", operation(cm, function(e) {
        if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
        if (e.keyCode == 16) cm.doc.sel.shift = false;
      }));
      on(d.input, "input", function() {
        if (ie && !ie_lt9 && cm.display.inputHasSelection) cm.display.inputHasSelection = null;
        fastPoll(cm);
      });
      on(d.input, "keydown", operation(cm, onKeyDown));
      on(d.input, "keypress", operation(cm, onKeyPress));
      on(d.input, "focus", bind(onFocus, cm));
      on(d.input, "blur", bind(onBlur, cm));
  
      function drag_(e) {
        if (signalDOMEvent(cm, e) || cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))) return;
        e_stop(e);
      }
      if (cm.options.dragDrop) {
        on(d.scroller, "dragstart", function(e){onDragStart(cm, e);});
        on(d.scroller, "dragenter", drag_);
        on(d.scroller, "dragover", drag_);
        on(d.scroller, "drop", operation(cm, onDrop));
      }
      on(d.scroller, "paste", function(e) {
        if (eventInWidget(d, e)) return;
        focusInput(cm);
        fastPoll(cm);
      });
      on(d.input, "paste", function() {
        // Workaround for webkit bug https://bugs.webkit.org/show_bug.cgi?id=90206
        // Add a char to the end of textarea before paste occur so that
        // selection doesn't span to the end of textarea.
        if (webkit && !cm.state.fakedLastChar && !(new Date - cm.state.lastMiddleDown < 200)) {
          var start = d.input.selectionStart, end = d.input.selectionEnd;
          d.input.value += "$";
          d.input.selectionStart = start;
          d.input.selectionEnd = end;
          cm.state.fakedLastChar = true;
        }
        cm.state.pasteIncoming = true;
        fastPoll(cm);
      });
  
      function prepareCopy() {
        if (d.inaccurateSelection) {
          d.prevInput = "";
          d.inaccurateSelection = false;
          d.input.value = cm.getSelection();
          selectInput(d.input);
        }
      }
      on(d.input, "cut", prepareCopy);
      on(d.input, "copy", prepareCopy);
  
      // Needed to handle Tab key in KHTML
      if (khtml) on(d.sizer, "mouseup", function() {
          if (document.activeElement == d.input) d.input.blur();
          focusInput(cm);
      });
    }
  
    function eventInWidget(display, e) {
      for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
        if (!n || n.ignoreEvents || n.parentNode == display.sizer && n != display.mover) return true;
      }
    }
  
    function posFromMouse(cm, e, liberal) {
      var display = cm.display;
      if (!liberal) {
        var target = e_target(e);
        if (target == display.scrollbarH || target == display.scrollbarH.firstChild ||
            target == display.scrollbarV || target == display.scrollbarV.firstChild ||
            target == display.scrollbarFiller || target == display.gutterFiller) return null;
      }
      var x, y, space = getRect(display.lineSpace);
      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
      try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
      return coordsChar(cm, x - space.left, y - space.top);
    }
  
    var lastClick, lastDoubleClick;
    function onMouseDown(e) {
      if (signalDOMEvent(this, e)) return;
      var cm = this, display = cm.display, doc = cm.doc, sel = doc.sel;
      sel.shift = e.shiftKey;
  
      if (eventInWidget(display, e)) {
        if (!webkit) {
          display.scroller.draggable = false;
          setTimeout(function(){display.scroller.draggable = true;}, 100);
        }
        return;
      }
      if (clickInGutter(cm, e)) return;
      var start = posFromMouse(cm, e);
  
      switch (e_button(e)) {
      case 3:
        if (captureMiddleClick) onContextMenu.call(cm, cm, e);
        return;
      case 2:
        if (webkit) cm.state.lastMiddleDown = +new Date;
        if (start) extendSelection(cm.doc, start);
        setTimeout(bind(focusInput, cm), 20);
        e_preventDefault(e);
        return;
      }
      // For button 1, if it was clicked inside the editor
      // (posFromMouse returning non-null), we have to adjust the
      // selection.
      if (!start) {if (e_target(e) == display.scroller) e_preventDefault(e); return;}
  
      if (!cm.state.focused) onFocus(cm);
  
      var now = +new Date, type = "single";
      if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
        type = "triple";
        e_preventDefault(e);
        setTimeout(bind(focusInput, cm), 20);
        selectLine(cm, start.line);
      } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
        type = "double";
        lastDoubleClick = {time: now, pos: start};
        e_preventDefault(e);
        var word = findWordAt(getLine(doc, start.line).text, start);
        extendSelection(cm.doc, word.from, word.to);
      } else { lastClick = {time: now, pos: start}; }
  
      var last = start;
      if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) && !posEq(sel.from, sel.to) &&
          !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {
        var dragEnd = operation(cm, function(e2) {
          if (webkit) display.scroller.draggable = false;
          cm.state.draggingText = false;
          off(document, "mouseup", dragEnd);
          off(display.scroller, "drop", dragEnd);
          if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
            e_preventDefault(e2);
            extendSelection(cm.doc, start);
            focusInput(cm);
          }
        });
        // Let the drag handler handle this.
        if (webkit) display.scroller.draggable = true;
        cm.state.draggingText = dragEnd;
        // IE's approach to draggable
        if (display.scroller.dragDrop) display.scroller.dragDrop();
        on(document, "mouseup", dragEnd);
        on(display.scroller, "drop", dragEnd);
        return;
      }
      e_preventDefault(e);
      if (type == "single") extendSelection(cm.doc, clipPos(doc, start));
  
      var startstart = sel.from, startend = sel.to, lastPos = start;
  
      function doSelect(cur) {
        if (posEq(lastPos, cur)) return;
        lastPos = cur;
  
        if (type == "single") {
          extendSelection(cm.doc, clipPos(doc, start), cur);
          return;
        }
  
        startstart = clipPos(doc, startstart);
        startend = clipPos(doc, startend);
        if (type == "double") {
          var word = findWordAt(getLine(doc, cur.line).text, cur);
          if (posLess(cur, startstart)) extendSelection(cm.doc, word.from, startend);
          else extendSelection(cm.doc, startstart, word.to);
        } else if (type == "triple") {
          if (posLess(cur, startstart)) extendSelection(cm.doc, startend, clipPos(doc, Pos(cur.line, 0)));
          else extendSelection(cm.doc, startstart, clipPos(doc, Pos(cur.line + 1, 0)));
        }
      }
  
      var editorSize = getRect(display.wrapper);
      // Used to ensure timeout re-tries don't fire when another extend
      // happened in the meantime (clearTimeout isn't reliable -- at
      // least on Chrome, the timeouts still happen even when cleared,
      // if the clear happens after their scheduled firing time).
      var counter = 0;
  
      function extend(e) {
        var curCount = ++counter;
        var cur = posFromMouse(cm, e, true);
        if (!cur) return;
        if (!posEq(cur, last)) {
          if (!cm.state.focused) onFocus(cm);
          last = cur;
          doSelect(cur);
          var visible = visibleLines(display, doc);
          if (cur.line >= visible.to || cur.line < visible.from)
            setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
        } else {
          var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
          if (outside) setTimeout(operation(cm, function() {
            if (counter != curCount) return;
            display.scroller.scrollTop += outside;
            extend(e);
          }), 50);
        }
      }
  
      function done(e) {
        counter = Infinity;
        e_preventDefault(e);
        focusInput(cm);
        off(document, "mousemove", move);
        off(document, "mouseup", up);
      }
  
      var move = operation(cm, function(e) {
        if (!ie && !e_button(e)) done(e);
        else extend(e);
      });
      var up = operation(cm, done);
      on(document, "mousemove", move);
      on(document, "mouseup", up);
    }
  
    function gutterEvent(cm, e, type, prevent, signalfn) {
      try { var mX = e.clientX, mY = e.clientY; }
      catch(e) { return false; }
      if (mX >= Math.floor(getRect(cm.display.gutters).right)) return false;
      if (prevent) e_preventDefault(e);
  
      var display = cm.display;
      var lineBox = getRect(display.lineDiv);
  
      if (mY > lineBox.bottom || !hasHandler(cm, type)) return e_defaultPrevented(e);
      mY -= lineBox.top - display.viewOffset;
  
      for (var i = 0; i < cm.options.gutters.length; ++i) {
        var g = display.gutters.childNodes[i];
        if (g && getRect(g).right >= mX) {
          var line = lineAtHeight(cm.doc, mY);
          var gutter = cm.options.gutters[i];
          signalfn(cm, type, cm, line, gutter, e);
          return e_defaultPrevented(e);
        }
      }
    }
  
    function contextMenuInGutter(cm, e) {
      if (!hasHandler(cm, "gutterContextMenu")) return false;
      return gutterEvent(cm, e, "gutterContextMenu", false, signal);
    }
  
    function clickInGutter(cm, e) {
      return gutterEvent(cm, e, "gutterClick", true, signalLater);
    }
  
    // Kludge to work around strange IE behavior where it'll sometimes
    // re-fire a series of drag-related events right after the drop (#1551)
    var lastDrop = 0;
  
    function onDrop(e) {
      var cm = this;
      if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e) || (cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))))
        return;
      e_preventDefault(e);
      if (ie) lastDrop = +new Date;
      var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
      if (!pos || isReadOnly(cm)) return;
      if (files && files.length && window.FileReader && window.File) {
        var n = files.length, text = Array(n), read = 0;
        var loadFile = function(file, i) {
          var reader = new FileReader;
          reader.onload = function() {
            text[i] = reader.result;
            if (++read == n) {
              pos = clipPos(cm.doc, pos);
              makeChange(cm.doc, {from: pos, to: pos, text: splitLines(text.join("\n")), origin: "paste"}, "around");
            }
          };
          reader.readAsText(file);
        };
        for (var i = 0; i < n; ++i) loadFile(files[i], i);
      } else {
        // Don't do a replace if the drop happened inside of the selected text.
        if (cm.state.draggingText && !(posLess(pos, cm.doc.sel.from) || posLess(cm.doc.sel.to, pos))) {
          cm.state.draggingText(e);
          // Ensure the editor is re-focused
          setTimeout(bind(focusInput, cm), 20);
          return;
        }
        try {
          var text = e.dataTransfer.getData("Text");
          if (text) {
            var curFrom = cm.doc.sel.from, curTo = cm.doc.sel.to;
            setSelection(cm.doc, pos, pos);
            if (cm.state.draggingText) replaceRange(cm.doc, "", curFrom, curTo, "paste");
            cm.replaceSelection(text, null, "paste");
            focusInput(cm);
            onFocus(cm);
          }
        }
        catch(e){}
      }
    }
  
    function onDragStart(cm, e) {
      if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }
      if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;
  
      var txt = cm.getSelection();
      e.dataTransfer.setData("Text", txt);
  
      // Use dummy image instead of default browsers image.
      // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
      if (e.dataTransfer.setDragImage && !safari) {
        var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
        img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
        if (opera) {
          img.width = img.height = 1;
          cm.display.wrapper.appendChild(img);
          // Force a relayout, or Opera won't use our image for some obscure reason
          img._top = img.offsetTop;
        }
        e.dataTransfer.setDragImage(img, 0, 0);
        if (opera) img.parentNode.removeChild(img);
      }
    }
  
    function setScrollTop(cm, val) {
      if (Math.abs(cm.doc.scrollTop - val) < 2) return;
      cm.doc.scrollTop = val;
      if (!gecko) updateDisplay(cm, [], val);
      if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
      if (cm.display.scrollbarV.scrollTop != val) cm.display.scrollbarV.scrollTop = val;
      if (gecko) updateDisplay(cm, []);
      startWorker(cm, 100);
    }
    function setScrollLeft(cm, val, isScroller) {
      if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;
      val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
      cm.doc.scrollLeft = val;
      alignHorizontally(cm);
      if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;
      if (cm.display.scrollbarH.scrollLeft != val) cm.display.scrollbarH.scrollLeft = val;
    }
  
    // Since the delta values reported on mouse wheel events are
    // unstandardized between browsers and even browser versions, and
    // generally horribly unpredictable, this code starts by measuring
    // the scroll effect that the first few mouse wheel events have,
    // and, from that, detects the way it can convert deltas to pixel
    // offsets afterwards.
    //
    // The reason we want to know the amount a wheel event will scroll
    // is that it gives us a chance to update the display before the
    // actual scrolling happens, reducing flickering.
  
    var wheelSamples = 0, wheelPixelsPerUnit = null;
    // Fill in a browser-detected starting value on browsers where we
    // know one. These don't have to be accurate -- the result of them
    // being wrong would just be a slight flicker on the first wheel
    // scroll (if it is large enough).
    if (ie) wheelPixelsPerUnit = -.53;
    else if (gecko) wheelPixelsPerUnit = 15;
    else if (chrome) wheelPixelsPerUnit = -.7;
    else if (safari) wheelPixelsPerUnit = -1/3;
  
    function onScrollWheel(cm, e) {
      var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
      if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;
      if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;
      else if (dy == null) dy = e.wheelDelta;
  
      var display = cm.display, scroll = display.scroller;
      // Quit if there's nothing to scroll here
      if (!(dx && scroll.scrollWidth > scroll.clientWidth ||
            dy && scroll.scrollHeight > scroll.clientHeight)) return;
  
      // Webkit browsers on OS X abort momentum scrolls when the target
      // of the scroll event is removed from the scrollable element.
      // This hack (see related code in patchDisplay) makes sure the
      // element is kept around.
      if (dy && mac && webkit) {
        for (var cur = e.target; cur != scroll; cur = cur.parentNode) {
          if (cur.lineObj) {
            cm.display.currentWheelTarget = cur;
            break;
          }
        }
      }
  
      // On some browsers, horizontal scrolling will cause redraws to
      // happen before the gutter has been realigned, causing it to
      // wriggle around in a most unseemly way. When we have an
      // estimated pixels/delta value, we just handle horizontal
      // scrolling entirely here. It'll be slightly off from native, but
      // better than glitching out.
      if (dx && !gecko && !opera && wheelPixelsPerUnit != null) {
        if (dy)
          setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
        setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
        e_preventDefault(e);
        display.wheelStartX = null; // Abort measurement, if in progress
        return;
      }
  
      if (dy && wheelPixelsPerUnit != null) {
        var pixels = dy * wheelPixelsPerUnit;
        var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
        if (pixels < 0) top = Math.max(0, top + pixels - 50);
        else bot = Math.min(cm.doc.height, bot + pixels + 50);
        updateDisplay(cm, [], {top: top, bottom: bot});
      }
  
      if (wheelSamples < 20) {
        if (display.wheelStartX == null) {
          display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
          display.wheelDX = dx; display.wheelDY = dy;
          setTimeout(function() {
            if (display.wheelStartX == null) return;
            var movedX = scroll.scrollLeft - display.wheelStartX;
            var movedY = scroll.scrollTop - display.wheelStartY;
            var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
              (movedX && display.wheelDX && movedX / display.wheelDX);
            display.wheelStartX = display.wheelStartY = null;
            if (!sample) return;
            wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
            ++wheelSamples;
          }, 200);
        } else {
          display.wheelDX += dx; display.wheelDY += dy;
        }
      }
    }
  
    function doHandleBinding(cm, bound, dropShift) {
      if (typeof bound == "string") {
        bound = commands[bound];
        if (!bound) return false;
      }
      // Ensure previous input has been read, so that the handler sees a
      // consistent view of the document
      if (cm.display.pollingFast && readInput(cm)) cm.display.pollingFast = false;
      var doc = cm.doc, prevShift = doc.sel.shift, done = false;
      try {
        if (isReadOnly(cm)) cm.state.suppressEdits = true;
        if (dropShift) doc.sel.shift = false;
        done = bound(cm) != Pass;
      } finally {
        doc.sel.shift = prevShift;
        cm.state.suppressEdits = false;
      }
      return done;
    }
  
    function allKeyMaps(cm) {
      var maps = cm.state.keyMaps.slice(0);
      if (cm.options.extraKeys) maps.push(cm.options.extraKeys);
      maps.push(cm.options.keyMap);
      return maps;
    }
  
    var maybeTransition;
    function handleKeyBinding(cm, e) {
      // Handle auto keymap transitions
      var startMap = getKeyMap(cm.options.keyMap), next = startMap.auto;
      clearTimeout(maybeTransition);
      if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
        if (getKeyMap(cm.options.keyMap) == startMap) {
          cm.options.keyMap = (next.call ? next.call(null, cm) : next);
          keyMapChanged(cm);
        }
      }, 50);
  
      var name = keyName(e, true), handled = false;
      if (!name) return false;
      var keymaps = allKeyMaps(cm);
  
      if (e.shiftKey) {
        // First try to resolve full name (including 'Shift-'). Failing
        // that, see if there is a cursor-motion command (starting with
        // 'go') bound to the keyname without 'Shift-'.
        handled = lookupKey("Shift-" + name, keymaps, function(b) {return doHandleBinding(cm, b, true);})
               || lookupKey(name, keymaps, function(b) {
                    if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
                      return doHandleBinding(cm, b);
                  });
      } else {
        handled = lookupKey(name, keymaps, function(b) { return doHandleBinding(cm, b); });
      }
  
      if (handled) {
        e_preventDefault(e);
        restartBlink(cm);
        if (ie_lt9) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
        signalLater(cm, "keyHandled", cm, name, e);
      }
      return handled;
    }
  
    function handleCharBinding(cm, e, ch) {
      var handled = lookupKey("'" + ch + "'", allKeyMaps(cm),
                              function(b) { return doHandleBinding(cm, b, true); });
      if (handled) {
        e_preventDefault(e);
        restartBlink(cm);
        signalLater(cm, "keyHandled", cm, "'" + ch + "'", e);
      }
      return handled;
    }
  
    var lastStoppedKey = null;
    function onKeyDown(e) {
      var cm = this;
      if (!cm.state.focused) onFocus(cm);
      if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
      if (ie && e.keyCode == 27) e.returnValue = false;
      var code = e.keyCode;
      // IE does strange things with escape.
      cm.doc.sel.shift = code == 16 || e.shiftKey;
      // First give onKeyEvent option a chance to handle this.
      var handled = handleKeyBinding(cm, e);
      if (opera) {
        lastStoppedKey = handled ? code : null;
        // Opera has no cut event... we try to at least catch the key combo
        if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
          cm.replaceSelection("");
      }
    }
  
    function onKeyPress(e) {
      var cm = this;
      if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
      var keyCode = e.keyCode, charCode = e.charCode;
      if (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
      if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) return;
      var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
      if (this.options.electricChars && this.doc.mode.electricChars &&
          this.options.smartIndent && !isReadOnly(this) &&
          this.doc.mode.electricChars.indexOf(ch) > -1)
        setTimeout(operation(cm, function() {indentLine(cm, cm.doc.sel.to.line, "smart");}), 75);
      if (handleCharBinding(cm, e, ch)) return;
      if (ie && !ie_lt9) cm.display.inputHasSelection = null;
      fastPoll(cm);
    }
  
    function onFocus(cm) {
      if (cm.options.readOnly == "nocursor") return;
      if (!cm.state.focused) {
        signal(cm, "focus", cm);
        cm.state.focused = true;
        if (cm.display.wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
          cm.display.wrapper.className += " CodeMirror-focused";
        if (!cm.curOp) {
          resetInput(cm, true);
          if (webkit) setTimeout(bind(resetInput, cm, true), 0); // Issue #1730
        }
      }
      slowPoll(cm);
      restartBlink(cm);
    }
    function onBlur(cm) {
      if (cm.state.focused) {
        signal(cm, "blur", cm);
        cm.state.focused = false;
        cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-focused", "");
      }
      clearInterval(cm.display.blinker);
      setTimeout(function() {if (!cm.state.focused) cm.doc.sel.shift = false;}, 150);
    }
  
    var detectingSelectAll;
    function onContextMenu(cm, e) {
      if (signalDOMEvent(cm, e, "contextmenu")) return;
      var display = cm.display, sel = cm.doc.sel;
      if (eventInWidget(display, e) || contextMenuInGutter(cm, e)) return;
  
      var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
      if (!pos || opera) return; // Opera is difficult.
  
      // Reset the current text selection only if the click is done outside of the selection
      // and 'resetSelectionOnContextMenu' option is true.
      var reset = cm.options.resetSelectionOnContextMenu;
      if (reset && (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to)))
        operation(cm, setSelection)(cm.doc, pos, pos);
  
      var oldCSS = display.input.style.cssText;
      display.inputDiv.style.position = "absolute";
      display.input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; outline: none;" +
        "border-width: 0; outline: none; overflow: hidden; opacity: .05; -ms-opacity: .05; filter: alpha(opacity=5);";
      focusInput(cm);
      resetInput(cm, true);
      // Adds "Select all" to context menu in FF
      if (posEq(sel.from, sel.to)) display.input.value = display.prevInput = " ";
  
      function prepareSelectAllHack() {
        if (display.input.selectionStart != null) {
          var extval = display.input.value = "\u200b" + (posEq(sel.from, sel.to) ? "" : display.input.value);
          display.prevInput = "\u200b";
          display.input.selectionStart = 1; display.input.selectionEnd = extval.length;
        }
      }
      function rehide() {
        display.inputDiv.style.position = "relative";
        display.input.style.cssText = oldCSS;
        if (ie_lt9) display.scrollbarV.scrollTop = display.scroller.scrollTop = scrollPos;
        slowPoll(cm);
  
        // Try to detect the user choosing select-all
        if (display.input.selectionStart != null) {
          if (!ie || ie_lt9) prepareSelectAllHack();
          clearTimeout(detectingSelectAll);
          var i = 0, poll = function(){
            if (display.prevInput == " " && display.input.selectionStart == 0)
              operation(cm, commands.selectAll)(cm);
            else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
            else resetInput(cm);
          };
          detectingSelectAll = setTimeout(poll, 200);
        }
      }
  
      if (ie && !ie_lt9) prepareSelectAllHack();
      if (captureMiddleClick) {
        e_stop(e);
        var mouseup = function() {
          off(window, "mouseup", mouseup);
          setTimeout(rehide, 20);
        };
        on(window, "mouseup", mouseup);
      } else {
        setTimeout(rehide, 50);
      }
    }
  
    // UPDATING
  
    var changeEnd = CodeMirror.changeEnd = function(change) {
      if (!change.text) return change.to;
      return Pos(change.from.line + change.text.length - 1,
                 lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
    };
  
    // Make sure a position will be valid after the given change.
    function clipPostChange(doc, change, pos) {
      if (!posLess(change.from, pos)) return clipPos(doc, pos);
      var diff = (change.text.length - 1) - (change.to.line - change.from.line);
      if (pos.line > change.to.line + diff) {
        var preLine = pos.line - diff, lastLine = doc.first + doc.size - 1;
        if (preLine > lastLine) return Pos(lastLine, getLine(doc, lastLine).text.length);
        return clipToLen(pos, getLine(doc, preLine).text.length);
      }
      if (pos.line == change.to.line + diff)
        return clipToLen(pos, lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0) +
                         getLine(doc, change.to.line).text.length - change.to.ch);
      var inside = pos.line - change.from.line;
      return clipToLen(pos, change.text[inside].length + (inside ? 0 : change.from.ch));
    }
  
    // Hint can be null|"end"|"start"|"around"|{anchor,head}
    function computeSelAfterChange(doc, change, hint) {
      if (hint && typeof hint == "object") // Assumed to be {anchor, head} object
        return {anchor: clipPostChange(doc, change, hint.anchor),
                head: clipPostChange(doc, change, hint.head)};
  
      if (hint == "start") return {anchor: change.from, head: change.from};
  
      var end = changeEnd(change);
      if (hint == "around") return {anchor: change.from, head: end};
      if (hint == "end") return {anchor: end, head: end};
  
      // hint is null, leave the selection alone as much as possible
      var adjustPos = function(pos) {
        if (posLess(pos, change.from)) return pos;
        if (!posLess(change.to, pos)) return end;
  
        var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
        if (pos.line == change.to.line) ch += end.ch - change.to.ch;
        return Pos(line, ch);
      };
      return {anchor: adjustPos(doc.sel.anchor), head: adjustPos(doc.sel.head)};
    }
  
    function filterChange(doc, change, update) {
      var obj = {
        canceled: false,
        from: change.from,
        to: change.to,
        text: change.text,
        origin: change.origin,
        cancel: function() { this.canceled = true; }
      };
      if (update) obj.update = function(from, to, text, origin) {
        if (from) this.from = clipPos(doc, from);
        if (to) this.to = clipPos(doc, to);
        if (text) this.text = text;
        if (origin !== undefined) this.origin = origin;
      };
      signal(doc, "beforeChange", doc, obj);
      if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);
  
      if (obj.canceled) return null;
      return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};
    }
  
    // Replace the range from from to to by the strings in replacement.
    // change is a {from, to, text [, origin]} object
    function makeChange(doc, change, selUpdate, ignoreReadOnly) {
      if (doc.cm) {
        if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, selUpdate, ignoreReadOnly);
        if (doc.cm.state.suppressEdits) return;
      }
  
      if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
        change = filterChange(doc, change, true);
        if (!change) return;
      }
  
      // Possibly split or suppress the update based on the presence
      // of read-only spans in its range.
      var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
      if (split) {
        for (var i = split.length - 1; i >= 1; --i)
          makeChangeNoReadonly(doc, {from: split[i].from, to: split[i].to, text: [""]});
        if (split.length)
          makeChangeNoReadonly(doc, {from: split[0].from, to: split[0].to, text: change.text}, selUpdate);
      } else {
        makeChangeNoReadonly(doc, change, selUpdate);
      }
    }
  
    function makeChangeNoReadonly(doc, change, selUpdate) {
      if (change.text.length == 1 && change.text[0] == "" && posEq(change.from, change.to)) return;
      var selAfter = computeSelAfterChange(doc, change, selUpdate);
      addToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
  
      makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
      var rebased = [];
  
      linkedDocs(doc, function(doc, sharedHist) {
        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
          rebaseHist(doc.history, change);
          rebased.push(doc.history);
        }
        makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
      });
    }
  
    function makeChangeFromHistory(doc, type) {
      if (doc.cm && doc.cm.state.suppressEdits) return;
  
      var hist = doc.history;
      var event = (type == "undo" ? hist.done : hist.undone).pop();
      if (!event) return;
  
      var anti = {changes: [], anchorBefore: event.anchorAfter, headBefore: event.headAfter,
                  anchorAfter: event.anchorBefore, headAfter: event.headBefore,
                  generation: hist.generation};
      (type == "undo" ? hist.undone : hist.done).push(anti);
      hist.generation = event.generation || ++hist.maxGeneration;
  
      var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
  
      for (var i = event.changes.length - 1; i >= 0; --i) {
        var change = event.changes[i];
        change.origin = type;
        if (filter && !filterChange(doc, change, false)) {
          (type == "undo" ? hist.done : hist.undone).length = 0;
          return;
        }
  
        anti.changes.push(historyChangeFromChange(doc, change));
  
        var after = i ? computeSelAfterChange(doc, change, null)
                      : {anchor: event.anchorBefore, head: event.headBefore};
        makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
        var rebased = [];
  
        linkedDocs(doc, function(doc, sharedHist) {
          if (!sharedHist && indexOf(rebased, doc.history) == -1) {
            rebaseHist(doc.history, change);
            rebased.push(doc.history);
          }
          makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
        });
      }
    }
  
    function shiftDoc(doc, distance) {
      function shiftPos(pos) {return Pos(pos.line + distance, pos.ch);}
      doc.first += distance;
      if (doc.cm) regChange(doc.cm, doc.first, doc.first, distance);
      doc.sel.head = shiftPos(doc.sel.head); doc.sel.anchor = shiftPos(doc.sel.anchor);
      doc.sel.from = shiftPos(doc.sel.from); doc.sel.to = shiftPos(doc.sel.to);
    }
  
    function makeChangeSingleDoc(doc, change, selAfter, spans) {
      if (doc.cm && !doc.cm.curOp)
        return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
  
      if (change.to.line < doc.first) {
        shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
        return;
      }
      if (change.from.line > doc.lastLine()) return;
  
      // Clip the change to the size of this doc
      if (change.from.line < doc.first) {
        var shift = change.text.length - 1 - (doc.first - change.from.line);
        shiftDoc(doc, shift);
        change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
                  text: [lst(change.text)], origin: change.origin};
      }
      var last = doc.lastLine();
      if (change.to.line > last) {
        change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
                  text: [change.text[0]], origin: change.origin};
      }
  
      change.removed = getBetween(doc, change.from, change.to);
  
      if (!selAfter) selAfter = computeSelAfterChange(doc, change, null);
      if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans, selAfter);
      else updateDoc(doc, change, spans, selAfter);
    }
  
    function makeChangeSingleDocInEditor(cm, change, spans, selAfter) {
      var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
  
      var recomputeMaxLength = false, checkWidthStart = from.line;
      if (!cm.options.lineWrapping) {
        checkWidthStart = lineNo(visualLine(doc, getLine(doc, from.line)));
        doc.iter(checkWidthStart, to.line + 1, function(line) {
          if (line == display.maxLine) {
            recomputeMaxLength = true;
            return true;
          }
        });
      }
  
      if (!posLess(doc.sel.head, change.from) && !posLess(change.to, doc.sel.head))
        cm.curOp.cursorActivity = true;
  
      updateDoc(doc, change, spans, selAfter, estimateHeight(cm));
  
      if (!cm.options.lineWrapping) {
        doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
          var len = lineLength(doc, line);
          if (len > display.maxLineLength) {
            display.maxLine = line;
            display.maxLineLength = len;
            display.maxLineChanged = true;
            recomputeMaxLength = false;
          }
        });
        if (recomputeMaxLength) cm.curOp.updateMaxLine = true;
      }
  
      // Adjust frontier, schedule worker
      doc.frontier = Math.min(doc.frontier, from.line);
      startWorker(cm, 400);
  
      var lendiff = change.text.length - (to.line - from.line) - 1;
      // Remember that these lines changed, for updating the display
      regChange(cm, from.line, to.line + 1, lendiff);
  
      if (hasHandler(cm, "change")) {
        var changeObj = {from: from, to: to,
                         text: change.text,
                         removed: change.removed,
                         origin: change.origin};
        if (cm.curOp.textChanged) {
          for (var cur = cm.curOp.textChanged; cur.next; cur = cur.next) {}
          cur.next = changeObj;
        } else cm.curOp.textChanged = changeObj;
      }
    }
  
    function replaceRange(doc, code, from, to, origin) {
      if (!to) to = from;
      if (posLess(to, from)) { var tmp = to; to = from; from = tmp; }
      if (typeof code == "string") code = splitLines(code);
      makeChange(doc, {from: from, to: to, text: code, origin: origin}, null);
    }
  
    // POSITION OBJECT
  
    function Pos(line, ch) {
      if (!(this instanceof Pos)) return new Pos(line, ch);
      this.line = line; this.ch = ch;
    }
    CodeMirror.Pos = Pos;
  
    function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
    function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
    function copyPos(x) {return Pos(x.line, x.ch);}
  
    // SELECTION
  
    function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}
    function clipPos(doc, pos) {
      if (pos.line < doc.first) return Pos(doc.first, 0);
      var last = doc.first + doc.size - 1;
      if (pos.line > last) return Pos(last, getLine(doc, last).text.length);
      return clipToLen(pos, getLine(doc, pos.line).text.length);
    }
    function clipToLen(pos, linelen) {
      var ch = pos.ch;
      if (ch == null || ch > linelen) return Pos(pos.line, linelen);
      else if (ch < 0) return Pos(pos.line, 0);
      else return pos;
    }
    function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
  
    // If shift is held, this will move the selection anchor. Otherwise,
    // it'll set the whole selection.
    function extendSelection(doc, pos, other, bias) {
      if (doc.sel.shift || doc.sel.extend) {
        var anchor = doc.sel.anchor;
        if (other) {
          var posBefore = posLess(pos, anchor);
          if (posBefore != posLess(other, anchor)) {
            anchor = pos;
            pos = other;
          } else if (posBefore != posLess(pos, other)) {
            pos = other;
          }
        }
        setSelection(doc, anchor, pos, bias);
      } else {
        setSelection(doc, pos, other || pos, bias);
      }
      if (doc.cm) doc.cm.curOp.userSelChange = true;
    }
  
    function filterSelectionChange(doc, anchor, head) {
      var obj = {anchor: anchor, head: head};
      signal(doc, "beforeSelectionChange", doc, obj);
      if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
      obj.anchor = clipPos(doc, obj.anchor); obj.head = clipPos(doc, obj.head);
      return obj;
    }
  
    // Update the selection. Last two args are only used by
    // updateDoc, since they have to be expressed in the line
    // numbers before the update.
    function setSelection(doc, anchor, head, bias, checkAtomic) {
      if (!checkAtomic && hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
        var filtered = filterSelectionChange(doc, anchor, head);
        head = filtered.head;
        anchor = filtered.anchor;
      }
  
      var sel = doc.sel;
      sel.goalColumn = null;
      if (bias == null) bias = posLess(head, sel.head) ? -1 : 1;
      // Skip over atomic spans.
      if (checkAtomic || !posEq(anchor, sel.anchor))
        anchor = skipAtomic(doc, anchor, bias, checkAtomic != "push");
      if (checkAtomic || !posEq(head, sel.head))
        head = skipAtomic(doc, head, bias, checkAtomic != "push");
  
      if (posEq(sel.anchor, anchor) && posEq(sel.head, head)) return;
  
      sel.anchor = anchor; sel.head = head;
      var inv = posLess(head, anchor);
      sel.from = inv ? head : anchor;
      sel.to = inv ? anchor : head;
  
      if (doc.cm)
        doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged =
          doc.cm.curOp.cursorActivity = true;
  
      signalLater(doc, "cursorActivity", doc);
    }
  
    function reCheckSelection(cm) {
      setSelection(cm.doc, cm.doc.sel.from, cm.doc.sel.to, null, "push");
    }
  
    function skipAtomic(doc, pos, bias, mayClear) {
      var flipped = false, curPos = pos;
      var dir = bias || 1;
      doc.cantEdit = false;
      search: for (;;) {
        var line = getLine(doc, curPos.line);
        if (line.markedSpans) {
          for (var i = 0; i < line.markedSpans.length; ++i) {
            var sp = line.markedSpans[i], m = sp.marker;
            if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&
                (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {
              if (mayClear) {
                signal(m, "beforeCursorEnter");
                if (m.explicitlyCleared) {
                  if (!line.markedSpans) break;
                  else {--i; continue;}
                }
              }
              if (!m.atomic) continue;
              var newPos = m.find()[dir < 0 ? "from" : "to"];
              if (posEq(newPos, curPos)) {
                newPos.ch += dir;
                if (newPos.ch < 0) {
                  if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));
                  else newPos = null;
                } else if (newPos.ch > line.text.length) {
                  if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);
                  else newPos = null;
                }
                if (!newPos) {
                  if (flipped) {
                    // Driven in a corner -- no valid cursor position found at all
                    // -- try again *with* clearing, if we didn't already
                    if (!mayClear) return skipAtomic(doc, pos, bias, true);
                    // Otherwise, turn off editing until further notice, and return the start of the doc
                    doc.cantEdit = true;
                    return Pos(doc.first, 0);
                  }
                  flipped = true; newPos = pos; dir = -dir;
                }
              }
              curPos = newPos;
              continue search;
            }
          }
        }
        return curPos;
      }
    }
  
    // SCROLLING
  
    function scrollCursorIntoView(cm) {
      var coords = scrollPosIntoView(cm, cm.doc.sel.head, null, cm.options.cursorScrollMargin);
      if (!cm.state.focused) return;
      var display = cm.display, box = getRect(display.sizer), doScroll = null;
      if (coords.top + box.top < 0) doScroll = true;
      else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
      if (doScroll != null && !phantom) {
        var hidden = display.cursor.style.display == "none";
        if (hidden) {
          display.cursor.style.display = "";
          display.cursor.style.left = coords.left + "px";
          display.cursor.style.top = (coords.top - display.viewOffset) + "px";
        }
        display.cursor.scrollIntoView(doScroll);
        if (hidden) display.cursor.style.display = "none";
      }
    }
  
    function scrollPosIntoView(cm, pos, end, margin) {
      if (margin == null) margin = 0;
      for (;;) {
        var changed = false, coords = cursorCoords(cm, pos);
        var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
        var scrollPos = calculateScrollPos(cm, Math.min(coords.left, endCoords.left),
                                           Math.min(coords.top, endCoords.top) - margin,
                                           Math.max(coords.left, endCoords.left),
                                           Math.max(coords.bottom, endCoords.bottom) + margin);
        var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
        if (scrollPos.scrollTop != null) {
          setScrollTop(cm, scrollPos.scrollTop);
          if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;
        }
        if (scrollPos.scrollLeft != null) {
          setScrollLeft(cm, scrollPos.scrollLeft);
          if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;
        }
        if (!changed) return coords;
      }
    }
  
    function scrollIntoView(cm, x1, y1, x2, y2) {
      var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
      if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);
      if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);
    }
  
    function calculateScrollPos(cm, x1, y1, x2, y2) {
      var display = cm.display, snapMargin = textHeight(cm.display);
      if (y1 < 0) y1 = 0;
      var screen = display.scroller.clientHeight - scrollerCutOff, screentop = display.scroller.scrollTop, result = {};
      var docBottom = cm.doc.height + paddingVert(display);
      var atTop = y1 < snapMargin, atBottom = y2 > docBottom - snapMargin;
      if (y1 < screentop) {
        result.scrollTop = atTop ? 0 : y1;
      } else if (y2 > screentop + screen) {
        var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);
        if (newTop != screentop) result.scrollTop = newTop;
      }
  
      var screenw = display.scroller.clientWidth - scrollerCutOff, screenleft = display.scroller.scrollLeft;
      x1 += display.gutters.offsetWidth; x2 += display.gutters.offsetWidth;
      var gutterw = display.gutters.offsetWidth;
      var atLeft = x1 < gutterw + 10;
      if (x1 < screenleft + gutterw || atLeft) {
        if (atLeft) x1 = 0;
        result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
      } else if (x2 > screenw + screenleft - 3) {
        result.scrollLeft = x2 + 10 - screenw;
      }
      return result;
    }
  
    function updateScrollPos(cm, left, top) {
      cm.curOp.updateScrollPos = {scrollLeft: left == null ? cm.doc.scrollLeft : left,
                                  scrollTop: top == null ? cm.doc.scrollTop : top};
    }
  
    function addToScrollPos(cm, left, top) {
      var pos = cm.curOp.updateScrollPos || (cm.curOp.updateScrollPos = {scrollLeft: cm.doc.scrollLeft, scrollTop: cm.doc.scrollTop});
      var scroll = cm.display.scroller;
      pos.scrollTop = Math.max(0, Math.min(scroll.scrollHeight - scroll.clientHeight, pos.scrollTop + top));
      pos.scrollLeft = Math.max(0, Math.min(scroll.scrollWidth - scroll.clientWidth, pos.scrollLeft + left));
    }
  
    // API UTILITIES
  
    function indentLine(cm, n, how, aggressive) {
      var doc = cm.doc;
      if (how == null) how = "add";
      if (how == "smart") {
        if (!cm.doc.mode.indent) how = "prev";
        else var state = getStateBefore(cm, n);
      }
  
      var tabSize = cm.options.tabSize;
      var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
      var curSpaceString = line.text.match(/^\s*/)[0], indentation;
      if (how == "smart") {
        indentation = cm.doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
        if (indentation == Pass) {
          if (!aggressive) return;
          how = "prev";
        }
      }
      if (how == "prev") {
        if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);
        else indentation = 0;
      } else if (how == "add") {
        indentation = curSpace + cm.options.indentUnit;
      } else if (how == "subtract") {
        indentation = curSpace - cm.options.indentUnit;
      } else if (typeof how == "number") {
        indentation = curSpace + how;
      }
      indentation = Math.max(0, indentation);
  
      var indentString = "", pos = 0;
      if (cm.options.indentWithTabs)
        for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
      if (pos < indentation) indentString += spaceStr(indentation - pos);
  
      if (indentString != curSpaceString)
        replaceRange(cm.doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
      line.stateAfter = null;
    }
  
    function changeLine(cm, handle, op) {
      var no = handle, line = handle, doc = cm.doc;
      if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
      else no = lineNo(handle);
      if (no == null) return null;
      if (op(line, no)) regChange(cm, no, no + 1);
      else return null;
      return line;
    }
  
    function findPosH(doc, pos, dir, unit, visually) {
      var line = pos.line, ch = pos.ch, origDir = dir;
      var lineObj = getLine(doc, line);
      var possible = true;
      function findNextLine() {
        var l = line + dir;
        if (l < doc.first || l >= doc.first + doc.size) return (possible = false);
        line = l;
        return lineObj = getLine(doc, l);
      }
      function moveOnce(boundToLine) {
        var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
        if (next == null) {
          if (!boundToLine && findNextLine()) {
            if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
            else ch = dir < 0 ? lineObj.text.length : 0;
          } else return (possible = false);
        } else ch = next;
        return true;
      }
  
      if (unit == "char") moveOnce();
      else if (unit == "column") moveOnce(true);
      else if (unit == "word" || unit == "group") {
        var sawType = null, group = unit == "group";
        for (var first = true;; first = false) {
          if (dir < 0 && !moveOnce(!first)) break;
          var cur = lineObj.text.charAt(ch) || "\n";
          var type = isWordChar(cur) ? "w"
            : !group ? null
            : /\s/.test(cur) ? null
            : "p";
          if (sawType && sawType != type) {
            if (dir < 0) {dir = 1; moveOnce();}
            break;
          }
          if (type) sawType = type;
          if (dir > 0 && !moveOnce(!first)) break;
        }
      }
      var result = skipAtomic(doc, Pos(line, ch), origDir, true);
      if (!possible) result.hitSide = true;
      return result;
    }
  
    function findPosV(cm, pos, dir, unit) {
      var doc = cm.doc, x = pos.left, y;
      if (unit == "page") {
        var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
        y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));
      } else if (unit == "line") {
        y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
      }
      for (;;) {
        var target = coordsChar(cm, x, y);
        if (!target.outside) break;
        if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }
        y += dir * 5;
      }
      return target;
    }
  
    function findWordAt(line, pos) {
      var start = pos.ch, end = pos.ch;
      if (line) {
        if ((pos.xRel < 0 || end == line.length) && start) --start; else ++end;
        var startChar = line.charAt(start);
        var check = isWordChar(startChar) ? isWordChar
          : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}
          : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
        while (start > 0 && check(line.charAt(start - 1))) --start;
        while (end < line.length && check(line.charAt(end))) ++end;
      }
      return {from: Pos(pos.line, start), to: Pos(pos.line, end)};
    }
  
    function selectLine(cm, line) {
      extendSelection(cm.doc, Pos(line, 0), clipPos(cm.doc, Pos(line + 1, 0)));
    }
  
    // PROTOTYPE
  
    // The publicly visible API. Note that operation(null, f) means
    // 'wrap f in an operation, performed on its `this` parameter'
  
    CodeMirror.prototype = {
      constructor: CodeMirror,
      focus: function(){window.focus(); focusInput(this); onFocus(this); fastPoll(this);},
  
      setOption: function(option, value) {
        var options = this.options, old = options[option];
        if (options[option] == value && option != "mode") return;
        options[option] = value;
        if (optionHandlers.hasOwnProperty(option))
          operation(this, optionHandlers[option])(this, value, old);
      },
  
      getOption: function(option) {return this.options[option];},
      getDoc: function() {return this.doc;},
  
      addKeyMap: function(map, bottom) {
        this.state.keyMaps[bottom ? "push" : "unshift"](map);
      },
      removeKeyMap: function(map) {
        var maps = this.state.keyMaps;
        for (var i = 0; i < maps.length; ++i)
          if (maps[i] == map || (typeof maps[i] != "string" && maps[i].name == map)) {
            maps.splice(i, 1);
            return true;
          }
      },
  
      addOverlay: operation(null, function(spec, options) {
        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
        if (mode.startState) throw new Error("Overlays may not be stateful.");
        this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});
        this.state.modeGen++;
        regChange(this);
      }),
      removeOverlay: operation(null, function(spec) {
        var overlays = this.state.overlays;
        for (var i = 0; i < overlays.length; ++i) {
          var cur = overlays[i].modeSpec;
          if (cur == spec || typeof spec == "string" && cur.name == spec) {
            overlays.splice(i, 1);
            this.state.modeGen++;
            regChange(this);
            return;
          }
        }
      }),
  
      indentLine: operation(null, function(n, dir, aggressive) {
        if (typeof dir != "string" && typeof dir != "number") {
          if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";
          else dir = dir ? "add" : "subtract";
        }
        if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);
      }),
      indentSelection: operation(null, function(how) {
        var sel = this.doc.sel;
        if (posEq(sel.from, sel.to)) return indentLine(this, sel.from.line, how);
        var e = sel.to.line - (sel.to.ch ? 0 : 1);
        for (var i = sel.from.line; i <= e; ++i) indentLine(this, i, how);
      }),
  
      // Fetch the parser token for a given character. Useful for hacks
      // that want to inspect the mode state (say, for completion).
      getTokenAt: function(pos, precise) {
        var doc = this.doc;
        pos = clipPos(doc, pos);
        var state = getStateBefore(this, pos.line, precise), mode = this.doc.mode;
        var line = getLine(doc, pos.line);
        var stream = new StringStream(line.text, this.options.tabSize);
        while (stream.pos < pos.ch && !stream.eol()) {
          stream.start = stream.pos;
          var style = mode.token(stream, state);
        }
        return {start: stream.start,
                end: stream.pos,
                string: stream.current(),
                className: style || null, // Deprecated, use 'type' instead
                type: style || null,
                state: state};
      },
  
      getTokenTypeAt: function(pos) {
        pos = clipPos(this.doc, pos);
        var styles = getLineStyles(this, getLine(this.doc, pos.line));
        var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
        if (ch == 0) return styles[2];
        for (;;) {
          var mid = (before + after) >> 1;
          if ((mid ? styles[mid * 2 - 1] : 0) >= ch) after = mid;
          else if (styles[mid * 2 + 1] < ch) before = mid + 1;
          else return styles[mid * 2 + 2];
        }
      },
  
      getModeAt: function(pos) {
        var mode = this.doc.mode;
        if (!mode.innerMode) return mode;
        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
      },
  
      getHelper: function(pos, type) {
        if (!helpers.hasOwnProperty(type)) return;
        var help = helpers[type], mode = this.getModeAt(pos);
        return mode[type] && help[mode[type]] ||
          mode.helperType && help[mode.helperType] ||
          help[mode.name];
      },
  
      getStateAfter: function(line, precise) {
        var doc = this.doc;
        line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
        return getStateBefore(this, line + 1, precise);
      },
  
      cursorCoords: function(start, mode) {
        var pos, sel = this.doc.sel;
        if (start == null) pos = sel.head;
        else if (typeof start == "object") pos = clipPos(this.doc, start);
        else pos = start ? sel.from : sel.to;
        return cursorCoords(this, pos, mode || "page");
      },
  
      charCoords: function(pos, mode) {
        return charCoords(this, clipPos(this.doc, pos), mode || "page");
      },
  
      coordsChar: function(coords, mode) {
        coords = fromCoordSystem(this, coords, mode || "page");
        return coordsChar(this, coords.left, coords.top);
      },
  
      lineAtHeight: function(height, mode) {
        height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
        return lineAtHeight(this.doc, height + this.display.viewOffset);
      },
      heightAtLine: function(line, mode) {
        var end = false, last = this.doc.first + this.doc.size - 1;
        if (line < this.doc.first) line = this.doc.first;
        else if (line > last) { line = last; end = true; }
        var lineObj = getLine(this.doc, line);
        return intoCoordSystem(this, getLine(this.doc, line), {top: 0, left: 0}, mode || "page").top +
          (end ? lineObj.height : 0);
      },
  
      defaultTextHeight: function() { return textHeight(this.display); },
      defaultCharWidth: function() { return charWidth(this.display); },
  
      setGutterMarker: operation(null, function(line, gutterID, value) {
        return changeLine(this, line, function(line) {
          var markers = line.gutterMarkers || (line.gutterMarkers = {});
          markers[gutterID] = value;
          if (!value && isEmpty(markers)) line.gutterMarkers = null;
          return true;
        });
      }),
  
      clearGutter: operation(null, function(gutterID) {
        var cm = this, doc = cm.doc, i = doc.first;
        doc.iter(function(line) {
          if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
            line.gutterMarkers[gutterID] = null;
            regChange(cm, i, i + 1);
            if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
          }
          ++i;
        });
      }),
  
      addLineClass: operation(null, function(handle, where, cls) {
        return changeLine(this, handle, function(line) {
          var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
          if (!line[prop]) line[prop] = cls;
          else if (new RegExp("(?:^|\\s)" + cls + "(?:$|\\s)").test(line[prop])) return false;
          else line[prop] += " " + cls;
          return true;
        });
      }),
  
      removeLineClass: operation(null, function(handle, where, cls) {
        return changeLine(this, handle, function(line) {
          var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
          var cur = line[prop];
          if (!cur) return false;
          else if (cls == null) line[prop] = null;
          else {
            var found = cur.match(new RegExp("(?:^|\\s+)" + cls + "(?:$|\\s+)"));
            if (!found) return false;
            var end = found.index + found[0].length;
            line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
          }
          return true;
        });
      }),
  
      addLineWidget: operation(null, function(handle, node, options) {
        return addLineWidget(this, handle, node, options);
      }),
  
      removeLineWidget: function(widget) { widget.clear(); },
  
      lineInfo: function(line) {
        if (typeof line == "number") {
          if (!isLine(this.doc, line)) return null;
          var n = line;
          line = getLine(this.doc, line);
          if (!line) return null;
        } else {
          var n = lineNo(line);
          if (n == null) return null;
        }
        return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
                textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
                widgets: line.widgets};
      },
  
      getViewport: function() { return {from: this.display.showingFrom, to: this.display.showingTo};},
  
      addWidget: function(pos, node, scroll, vert, horiz) {
        var display = this.display;
        pos = cursorCoords(this, clipPos(this.doc, pos));
        var top = pos.bottom, left = pos.left;
        node.style.position = "absolute";
        display.sizer.appendChild(node);
        if (vert == "over") {
          top = pos.top;
        } else if (vert == "above" || vert == "near") {
          var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
          hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
          // Default to positioning above (if specified and possible); otherwise default to positioning below
          if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
            top = pos.top - node.offsetHeight;
          else if (pos.bottom + node.offsetHeight <= vspace)
            top = pos.bottom;
          if (left + node.offsetWidth > hspace)
            left = hspace - node.offsetWidth;
        }
        node.style.top = top + "px";
        node.style.left = node.style.right = "";
        if (horiz == "right") {
          left = display.sizer.clientWidth - node.offsetWidth;
          node.style.right = "0px";
        } else {
          if (horiz == "left") left = 0;
          else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;
          node.style.left = left + "px";
        }
        if (scroll)
          scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
      },
  
      triggerOnKeyDown: operation(null, onKeyDown),
  
      execCommand: function(cmd) {return commands[cmd](this);},
  
      findPosH: function(from, amount, unit, visually) {
        var dir = 1;
        if (amount < 0) { dir = -1; amount = -amount; }
        for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
          cur = findPosH(this.doc, cur, dir, unit, visually);
          if (cur.hitSide) break;
        }
        return cur;
      },
  
      moveH: operation(null, function(dir, unit) {
        var sel = this.doc.sel, pos;
        if (sel.shift || sel.extend || posEq(sel.from, sel.to))
          pos = findPosH(this.doc, sel.head, dir, unit, this.options.rtlMoveVisually);
        else
          pos = dir < 0 ? sel.from : sel.to;
        extendSelection(this.doc, pos, pos, dir);
      }),
  
      deleteH: operation(null, function(dir, unit) {
        var sel = this.doc.sel;
        if (!posEq(sel.from, sel.to)) replaceRange(this.doc, "", sel.from, sel.to, "+delete");
        else replaceRange(this.doc, "", sel.from, findPosH(this.doc, sel.head, dir, unit, false), "+delete");
        this.curOp.userSelChange = true;
      }),
  
      findPosV: function(from, amount, unit, goalColumn) {
        var dir = 1, x = goalColumn;
        if (amount < 0) { dir = -1; amount = -amount; }
        for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
          var coords = cursorCoords(this, cur, "div");
          if (x == null) x = coords.left;
          else coords.left = x;
          cur = findPosV(this, coords, dir, unit);
          if (cur.hitSide) break;
        }
        return cur;
      },
  
      moveV: operation(null, function(dir, unit) {
        var sel = this.doc.sel;
        var pos = cursorCoords(this, sel.head, "div");
        if (sel.goalColumn != null) pos.left = sel.goalColumn;
        var target = findPosV(this, pos, dir, unit);
  
        if (unit == "page") addToScrollPos(this, 0, charCoords(this, target, "div").top - pos.top);
        extendSelection(this.doc, target, target, dir);
        sel.goalColumn = pos.left;
      }),
  
      toggleOverwrite: function(value) {
        if (value != null && value == this.state.overwrite) return;
        if (this.state.overwrite = !this.state.overwrite)
          this.display.cursor.className += " CodeMirror-overwrite";
        else
          this.display.cursor.className = this.display.cursor.className.replace(" CodeMirror-overwrite", "");
      },
      hasFocus: function() { return this.state.focused; },
  
      scrollTo: operation(null, function(x, y) {
        updateScrollPos(this, x, y);
      }),
      getScrollInfo: function() {
        var scroller = this.display.scroller, co = scrollerCutOff;
        return {left: scroller.scrollLeft, top: scroller.scrollTop,
                height: scroller.scrollHeight - co, width: scroller.scrollWidth - co,
                clientHeight: scroller.clientHeight - co, clientWidth: scroller.clientWidth - co};
      },
  
      scrollIntoView: operation(null, function(range, margin) {
        if (range == null) range = {from: this.doc.sel.head, to: null};
        else if (typeof range == "number") range = {from: Pos(range, 0), to: null};
        else if (range.from == null) range = {from: range, to: null};
        if (!range.to) range.to = range.from;
        if (!margin) margin = 0;
  
        var coords = range;
        if (range.from.line != null) {
          this.curOp.scrollToPos = {from: range.from, to: range.to, margin: margin};
          coords = {from: cursorCoords(this, range.from),
                    to: cursorCoords(this, range.to)};
        }
        var sPos = calculateScrollPos(this, Math.min(coords.from.left, coords.to.left),
                                      Math.min(coords.from.top, coords.to.top) - margin,
                                      Math.max(coords.from.right, coords.to.right),
                                      Math.max(coords.from.bottom, coords.to.bottom) + margin);
        updateScrollPos(this, sPos.scrollLeft, sPos.scrollTop);
      }),
  
      setSize: operation(null, function(width, height) {
        function interpret(val) {
          return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
        }
        if (width != null) this.display.wrapper.style.width = interpret(width);
        if (height != null) this.display.wrapper.style.height = interpret(height);
        if (this.options.lineWrapping)
          this.display.measureLineCache.length = this.display.measureLineCachePos = 0;
        this.curOp.forceUpdate = true;
      }),
  
      operation: function(f){return runInOp(this, f);},
  
      refresh: operation(null, function() {
        var badHeight = this.display.cachedTextHeight == null;
        clearCaches(this);
        updateScrollPos(this, this.doc.scrollLeft, this.doc.scrollTop);
        regChange(this);
        if (badHeight) estimateLineHeights(this);
      }),
  
      swapDoc: operation(null, function(doc) {
        var old = this.doc;
        old.cm = null;
        attachDoc(this, doc);
        clearCaches(this);
        resetInput(this, true);
        updateScrollPos(this, doc.scrollLeft, doc.scrollTop);
        signalLater(this, "swapDoc", this, old);
        return old;
      }),
  
      getInputField: function(){return this.display.input;},
      getWrapperElement: function(){return this.display.wrapper;},
      getScrollerElement: function(){return this.display.scroller;},
      getGutterElement: function(){return this.display.gutters;}
    };
    eventMixin(CodeMirror);
  
    // OPTION DEFAULTS
  
    var optionHandlers = CodeMirror.optionHandlers = {};
  
    // The default configuration options.
    var defaults = CodeMirror.defaults = {};
  
    function option(name, deflt, handle, notOnInit) {
      CodeMirror.defaults[name] = deflt;
      if (handle) optionHandlers[name] =
        notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;
    }
  
    var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};
  
    // These two are, on init, called from the constructor because they
    // have to be initialized before the editor can start at all.
    option("value", "", function(cm, val) {
      cm.setValue(val);
    }, true);
    option("mode", null, function(cm, val) {
      cm.doc.modeOption = val;
      loadMode(cm);
    }, true);
  
    option("indentUnit", 2, loadMode, true);
    option("indentWithTabs", false);
    option("smartIndent", true);
    option("tabSize", 4, function(cm) {
      loadMode(cm);
      clearCaches(cm);
      regChange(cm);
    }, true);
    option("electricChars", true);
    option("rtlMoveVisually", !windows);
  
    option("theme", "default", function(cm) {
      themeChanged(cm);
      guttersChanged(cm);
    }, true);
    option("keyMap", "default", keyMapChanged);
    option("extraKeys", null);
  
    option("onKeyEvent", null);
    option("onDragEvent", null);
  
    option("lineWrapping", false, wrappingChanged, true);
    option("gutters", [], function(cm) {
      setGuttersForLineNumbers(cm.options);
      guttersChanged(cm);
    }, true);
    option("fixedGutter", true, function(cm, val) {
      cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
      cm.refresh();
    }, true);
    option("coverGutterNextToScrollbar", false, updateScrollbars, true);
    option("lineNumbers", false, function(cm) {
      setGuttersForLineNumbers(cm.options);
      guttersChanged(cm);
    }, true);
    option("firstLineNumber", 1, guttersChanged, true);
    option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
    option("showCursorWhenSelecting", false, updateSelection, true);
  
    option("resetSelectionOnContextMenu", true);
  
    option("readOnly", false, function(cm, val) {
      if (val == "nocursor") {onBlur(cm); cm.display.input.blur();}
      else if (!val) resetInput(cm, true);
    });
    option("dragDrop", true);
  
    option("cursorBlinkRate", 530);
    option("cursorScrollMargin", 0);
    option("cursorHeight", 1);
    option("workTime", 100);
    option("workDelay", 100);
    option("flattenSpans", true);
    option("pollInterval", 100);
    option("undoDepth", 40, function(cm, val){cm.doc.history.undoDepth = val;});
    option("historyEventDelay", 500);
    option("viewportMargin", 10, function(cm){cm.refresh();}, true);
    option("maxHighlightLength", 10000, function(cm){loadMode(cm); cm.refresh();}, true);
    option("crudeMeasuringFrom", 10000);
    option("moveInputWithCursor", true, function(cm, val) {
      if (!val) cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;
    });
  
    option("tabindex", null, function(cm, val) {
      cm.display.input.tabIndex = val || "";
    });
    option("autofocus", null);
  
    // MODE DEFINITION AND QUERYING
  
    // Known modes, by name and by MIME
    var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
  
    CodeMirror.defineMode = function(name, mode) {
      if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
      if (arguments.length > 2) {
        mode.dependencies = [];
        for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
      }
      modes[name] = mode;
    };
  
    CodeMirror.defineMIME = function(mime, spec) {
      mimeModes[mime] = spec;
    };
  
    CodeMirror.resolveMode = function(spec) {
      if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
        spec = mimeModes[spec];
      } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
        var found = mimeModes[spec.name];
        spec = createObj(found, spec);
        spec.name = found.name;
      } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
        return CodeMirror.resolveMode("application/xml");
      }
      if (typeof spec == "string") return {name: spec};
      else return spec || {name: "null"};
    };
  
    CodeMirror.getMode = function(options, spec) {
      var spec = CodeMirror.resolveMode(spec);
      var mfactory = modes[spec.name];
      if (!mfactory) return CodeMirror.getMode(options, "text/plain");
      var modeObj = mfactory(options, spec);
      if (modeExtensions.hasOwnProperty(spec.name)) {
        var exts = modeExtensions[spec.name];
        for (var prop in exts) {
          if (!exts.hasOwnProperty(prop)) continue;
          if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];
          modeObj[prop] = exts[prop];
        }
      }
      modeObj.name = spec.name;
  
      return modeObj;
    };
  
    CodeMirror.defineMode("null", function() {
      return {token: function(stream) {stream.skipToEnd();}};
    });
    CodeMirror.defineMIME("text/plain", "null");
  
    var modeExtensions = CodeMirror.modeExtensions = {};
    CodeMirror.extendMode = function(mode, properties) {
      var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
      copyObj(properties, exts);
    };
  
    // EXTENSIONS
  
    CodeMirror.defineExtension = function(name, func) {
      CodeMirror.prototype[name] = func;
    };
    CodeMirror.defineDocExtension = function(name, func) {
      Doc.prototype[name] = func;
    };
    CodeMirror.defineOption = option;
  
    var initHooks = [];
    CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
  
    var helpers = CodeMirror.helpers = {};
    CodeMirror.registerHelper = function(type, name, value) {
      if (!helpers.hasOwnProperty(type)) helpers[type] = CodeMirror[type] = {};
      helpers[type][name] = value;
    };
  
    // UTILITIES
  
    CodeMirror.isWordChar = isWordChar;
  
    // MODE STATE HANDLING
  
    // Utility functions for working with state. Exported because modes
    // sometimes need to do this.
    function copyState(mode, state) {
      if (state === true) return state;
      if (mode.copyState) return mode.copyState(state);
      var nstate = {};
      for (var n in state) {
        var val = state[n];
        if (val instanceof Array) val = val.concat([]);
        nstate[n] = val;
      }
      return nstate;
    }
    CodeMirror.copyState = copyState;
  
    function startState(mode, a1, a2) {
      return mode.startState ? mode.startState(a1, a2) : true;
    }
    CodeMirror.startState = startState;
  
    CodeMirror.innerMode = function(mode, state) {
      while (mode.innerMode) {
        var info = mode.innerMode(state);
        if (!info || info.mode == mode) break;
        state = info.state;
        mode = info.mode;
      }
      return info || {mode: mode, state: state};
    };
  
    // STANDARD COMMANDS
  
    var commands = CodeMirror.commands = {
      selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()));},
      killLine: function(cm) {
        var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
        if (!sel && cm.getLine(from.line).length == from.ch)
          cm.replaceRange("", from, Pos(from.line + 1, 0), "+delete");
        else cm.replaceRange("", from, sel ? to : Pos(from.line), "+delete");
      },
      deleteLine: function(cm) {
        var l = cm.getCursor().line;
        cm.replaceRange("", Pos(l, 0), Pos(l), "+delete");
      },
      delLineLeft: function(cm) {
        var cur = cm.getCursor();
        cm.replaceRange("", Pos(cur.line, 0), cur, "+delete");
      },
      undo: function(cm) {cm.undo();},
      redo: function(cm) {cm.redo();},
      goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
      goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
      goLineStart: function(cm) {
        cm.extendSelection(lineStart(cm, cm.getCursor().line));
      },
      goLineStartSmart: function(cm) {
        var cur = cm.getCursor(), start = lineStart(cm, cur.line);
        var line = cm.getLineHandle(start.line);
        var order = getOrder(line);
        if (!order || order[0].level == 0) {
          var firstNonWS = Math.max(0, line.text.search(/\S/));
          var inWS = cur.line == start.line && cur.ch <= firstNonWS && cur.ch;
          cm.extendSelection(Pos(start.line, inWS ? 0 : firstNonWS));
        } else cm.extendSelection(start);
      },
      goLineEnd: function(cm) {
        cm.extendSelection(lineEnd(cm, cm.getCursor().line));
      },
      goLineRight: function(cm) {
        var top = cm.charCoords(cm.getCursor(), "div").top + 5;
        cm.extendSelection(cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div"));
      },
      goLineLeft: function(cm) {
        var top = cm.charCoords(cm.getCursor(), "div").top + 5;
        cm.extendSelection(cm.coordsChar({left: 0, top: top}, "div"));
      },
      goLineUp: function(cm) {cm.moveV(-1, "line");},
      goLineDown: function(cm) {cm.moveV(1, "line");},
      goPageUp: function(cm) {cm.moveV(-1, "page");},
      goPageDown: function(cm) {cm.moveV(1, "page");},
      goCharLeft: function(cm) {cm.moveH(-1, "char");},
      goCharRight: function(cm) {cm.moveH(1, "char");},
      goColumnLeft: function(cm) {cm.moveH(-1, "column");},
      goColumnRight: function(cm) {cm.moveH(1, "column");},
      goWordLeft: function(cm) {cm.moveH(-1, "word");},
      goGroupRight: function(cm) {cm.moveH(1, "group");},
      goGroupLeft: function(cm) {cm.moveH(-1, "group");},
      goWordRight: function(cm) {cm.moveH(1, "word");},
      delCharBefore: function(cm) {cm.deleteH(-1, "char");},
      delCharAfter: function(cm) {cm.deleteH(1, "char");},
      delWordBefore: function(cm) {cm.deleteH(-1, "word");},
      delWordAfter: function(cm) {cm.deleteH(1, "word");},
      delGroupBefore: function(cm) {cm.deleteH(-1, "group");},
      delGroupAfter: function(cm) {cm.deleteH(1, "group");},
      indentAuto: function(cm) {cm.indentSelection("smart");},
      indentMore: function(cm) {cm.indentSelection("add");},
      indentLess: function(cm) {cm.indentSelection("subtract");},
      insertTab: function(cm) {cm.replaceSelection("\t", "end", "+input");},
      defaultTab: function(cm) {
        if (cm.somethingSelected()) cm.indentSelection("add");
        else cm.replaceSelection("\t", "end", "+input");
      },
      transposeChars: function(cm) {
        var cur = cm.getCursor(), line = cm.getLine(cur.line);
        if (cur.ch > 0 && cur.ch < line.length - 1)
          cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
                          Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1));
      },
      newlineAndIndent: function(cm) {
        operation(cm, function() {
          cm.replaceSelection("\n", "end", "+input");
          cm.indentLine(cm.getCursor().line, null, true);
        })();
      },
      toggleOverwrite: function(cm) {cm.toggleOverwrite();}
    };
  
    // STANDARD KEYMAPS
  
    var keyMap = CodeMirror.keyMap = {};
    keyMap.basic = {
      "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
      "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
      "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
      "Tab": "defaultTab", "Shift-Tab": "indentAuto",
      "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
    };
    // Note that the save and find-related commands aren't defined by
    // default. Unknown commands are simply ignored.
    keyMap.pcDefault = {
      "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
      "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
      "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
      "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
      "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
      "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
      fallthrough: "basic"
    };
    keyMap.macDefault = {
      "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
      "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
      "Alt-Right": "goGroupRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delGroupBefore",
      "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
      "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
      "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delLineLeft",
      fallthrough: ["basic", "emacsy"]
    };
    keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
    keyMap.emacsy = {
      "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
      "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
      "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
      "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
    };
  
    // KEYMAP DISPATCH
  
    function getKeyMap(val) {
      if (typeof val == "string") return keyMap[val];
      else return val;
    }
  
    function lookupKey(name, maps, handle) {
      function lookup(map) {
        map = getKeyMap(map);
        var found = map[name];
        if (found === false) return "stop";
        if (found != null && handle(found)) return true;
        if (map.nofallthrough) return "stop";
  
        var fallthrough = map.fallthrough;
        if (fallthrough == null) return false;
        if (Object.prototype.toString.call(fallthrough) != "[object Array]")
          return lookup(fallthrough);
        for (var i = 0, e = fallthrough.length; i < e; ++i) {
          var done = lookup(fallthrough[i]);
          if (done) return done;
        }
        return false;
      }
  
      for (var i = 0; i < maps.length; ++i) {
        var done = lookup(maps[i]);
        if (done) return done != "stop";
      }
    }
    function isModifierKey(event) {
      var name = keyNames[event.keyCode];
      return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
    }
    function keyName(event, noShift) {
      if (opera && event.keyCode == 34 && event["char"]) return false;
      var name = keyNames[event.keyCode];
      if (name == null || event.altGraphKey) return false;
      if (event.altKey) name = "Alt-" + name;
      if (flipCtrlCmd ? event.metaKey : event.ctrlKey) name = "Ctrl-" + name;
      if (flipCtrlCmd ? event.ctrlKey : event.metaKey) name = "Cmd-" + name;
      if (!noShift && event.shiftKey) name = "Shift-" + name;
      return name;
    }
    CodeMirror.lookupKey = lookupKey;
    CodeMirror.isModifierKey = isModifierKey;
    CodeMirror.keyName = keyName;
  
    // FROMTEXTAREA
  
    CodeMirror.fromTextArea = function(textarea, options) {
      if (!options) options = {};
      options.value = textarea.value;
      if (!options.tabindex && textarea.tabindex)
        options.tabindex = textarea.tabindex;
      if (!options.placeholder && textarea.placeholder)
        options.placeholder = textarea.placeholder;
      // Set autofocus to true if this textarea is focused, or if it has
      // autofocus and no other element is focused.
      if (options.autofocus == null) {
        var hasFocus = document.body;
        // doc.activeElement occasionally throws on IE
        try { hasFocus = document.activeElement; } catch(e) {}
        options.autofocus = hasFocus == textarea ||
          textarea.getAttribute("autofocus") != null && hasFocus == document.body;
      }
  
      function save() {textarea.value = cm.getValue();}
      if (textarea.form) {
        on(textarea.form, "submit", save);
        // Deplorable hack to make the submit method do the right thing.
        if (!options.leaveSubmitMethodAlone) {
          var form = textarea.form, realSubmit = form.submit;
          try {
            var wrappedSubmit = form.submit = function() {
              save();
              form.submit = realSubmit;
              form.submit();
              form.submit = wrappedSubmit;
            };
          } catch(e) {}
        }
      }
  
      textarea.style.display = "none";
      var cm = CodeMirror(function(node) {
        textarea.parentNode.insertBefore(node, textarea.nextSibling);
      }, options);
      cm.save = save;
      cm.getTextArea = function() { return textarea; };
      cm.toTextArea = function() {
        save();
        textarea.parentNode.removeChild(cm.getWrapperElement());
        textarea.style.display = "";
        if (textarea.form) {
          off(textarea.form, "submit", save);
          if (typeof textarea.form.submit == "function")
            textarea.form.submit = realSubmit;
        }
      };
      return cm;
    };
  
    // STRING STREAM
  
    // Fed to the mode parsers, provides helper functions to make
    // parsers more succinct.
  
    // The character stream used by a mode's parser.
    function StringStream(string, tabSize) {
      this.pos = this.start = 0;
      this.string = string;
      this.tabSize = tabSize || 8;
      this.lastColumnPos = this.lastColumnValue = 0;
    }
  
    StringStream.prototype = {
      eol: function() {return this.pos >= this.string.length;},
      sol: function() {return this.pos == 0;},
      peek: function() {return this.string.charAt(this.pos) || undefined;},
      next: function() {
        if (this.pos < this.string.length)
          return this.string.charAt(this.pos++);
      },
      eat: function(match) {
        var ch = this.string.charAt(this.pos);
        if (typeof match == "string") var ok = ch == match;
        else var ok = ch && (match.test ? match.test(ch) : match(ch));
        if (ok) {++this.pos; return ch;}
      },
      eatWhile: function(match) {
        var start = this.pos;
        while (this.eat(match)){}
        return this.pos > start;
      },
      eatSpace: function() {
        var start = this.pos;
        while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
        return this.pos > start;
      },
      skipToEnd: function() {this.pos = this.string.length;},
      skipTo: function(ch) {
        var found = this.string.indexOf(ch, this.pos);
        if (found > -1) {this.pos = found; return true;}
      },
      backUp: function(n) {this.pos -= n;},
      column: function() {
        if (this.lastColumnPos < this.start) {
          this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
          this.lastColumnPos = this.start;
        }
        return this.lastColumnValue;
      },
      indentation: function() {return countColumn(this.string, null, this.tabSize);},
      match: function(pattern, consume, caseInsensitive) {
        if (typeof pattern == "string") {
          var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
          var substr = this.string.substr(this.pos, pattern.length);
          if (cased(substr) == cased(pattern)) {
            if (consume !== false) this.pos += pattern.length;
            return true;
          }
        } else {
          var match = this.string.slice(this.pos).match(pattern);
          if (match && match.index > 0) return null;
          if (match && consume !== false) this.pos += match[0].length;
          return match;
        }
      },
      current: function(){return this.string.slice(this.start, this.pos);}
    };
    CodeMirror.StringStream = StringStream;
  
    // TEXTMARKERS
  
    function TextMarker(doc, type) {
      this.lines = [];
      this.type = type;
      this.doc = doc;
    }
    CodeMirror.TextMarker = TextMarker;
    eventMixin(TextMarker);
  
    TextMarker.prototype.clear = function() {
      if (this.explicitlyCleared) return;
      var cm = this.doc.cm, withOp = cm && !cm.curOp;
      if (withOp) startOperation(cm);
      if (hasHandler(this, "clear")) {
        var found = this.find();
        if (found) signalLater(this, "clear", found.from, found.to);
      }
      var min = null, max = null;
      for (var i = 0; i < this.lines.length; ++i) {
        var line = this.lines[i];
        var span = getMarkedSpanFor(line.markedSpans, this);
        if (span.to != null) max = lineNo(line);
        line.markedSpans = removeMarkedSpan(line.markedSpans, span);
        if (span.from != null)
          min = lineNo(line);
        else if (this.collapsed && !lineIsHidden(this.doc, line) && cm)
          updateLineHeight(line, textHeight(cm.display));
      }
      if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {
        var visual = visualLine(cm.doc, this.lines[i]), len = lineLength(cm.doc, visual);
        if (len > cm.display.maxLineLength) {
          cm.display.maxLine = visual;
          cm.display.maxLineLength = len;
          cm.display.maxLineChanged = true;
        }
      }
  
      if (min != null && cm) regChange(cm, min, max + 1);
      this.lines.length = 0;
      this.explicitlyCleared = true;
      if (this.atomic && this.doc.cantEdit) {
        this.doc.cantEdit = false;
        if (cm) reCheckSelection(cm);
      }
      if (withOp) endOperation(cm);
    };
  
    TextMarker.prototype.find = function() {
      var from, to;
      for (var i = 0; i < this.lines.length; ++i) {
        var line = this.lines[i];
        var span = getMarkedSpanFor(line.markedSpans, this);
        if (span.from != null || span.to != null) {
          var found = lineNo(line);
          if (span.from != null) from = Pos(found, span.from);
          if (span.to != null) to = Pos(found, span.to);
        }
      }
      if (this.type == "bookmark") return from;
      return from && {from: from, to: to};
    };
  
    TextMarker.prototype.changed = function() {
      var pos = this.find(), cm = this.doc.cm;
      if (!pos || !cm) return;
      if (this.type != "bookmark") pos = pos.from;
      var line = getLine(this.doc, pos.line);
      clearCachedMeasurement(cm, line);
      if (pos.line >= cm.display.showingFrom && pos.line < cm.display.showingTo) {
        for (var node = cm.display.lineDiv.firstChild; node; node = node.nextSibling) if (node.lineObj == line) {
          if (node.offsetHeight != line.height) updateLineHeight(line, node.offsetHeight);
          break;
        }
        runInOp(cm, function() {
          cm.curOp.selectionChanged = cm.curOp.forceUpdate = cm.curOp.updateMaxLine = true;
        });
      }
    };
  
    TextMarker.prototype.attachLine = function(line) {
      if (!this.lines.length && this.doc.cm) {
        var op = this.doc.cm.curOp;
        if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
          (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
      }
      this.lines.push(line);
    };
    TextMarker.prototype.detachLine = function(line) {
      this.lines.splice(indexOf(this.lines, line), 1);
      if (!this.lines.length && this.doc.cm) {
        var op = this.doc.cm.curOp;
        (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
      }
    };
  
    function markText(doc, from, to, options, type) {
      if (options && options.shared) return markTextShared(doc, from, to, options, type);
      if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);
  
      var marker = new TextMarker(doc, type);
      if (type == "range" && !posLess(from, to)) return marker;
      if (options) copyObj(options, marker);
      if (marker.replacedWith) {
        marker.collapsed = true;
        marker.replacedWith = elt("span", [marker.replacedWith], "CodeMirror-widget");
        if (!options.handleMouseEvents) marker.replacedWith.ignoreEvents = true;
      }
      if (marker.collapsed) sawCollapsedSpans = true;
  
      if (marker.addToHistory)
        addToHistory(doc, {from: from, to: to, origin: "markText"},
                     {head: doc.sel.head, anchor: doc.sel.anchor}, NaN);
  
      var curLine = from.line, size = 0, collapsedAtStart, collapsedAtEnd, cm = doc.cm, updateMaxLine;
      doc.iter(curLine, to.line + 1, function(line) {
        if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(doc, line) == cm.display.maxLine)
          updateMaxLine = true;
        var span = {from: null, to: null, marker: marker};
        size += line.text.length;
        if (curLine == from.line) {span.from = from.ch; size -= from.ch;}
        if (curLine == to.line) {span.to = to.ch; size -= line.text.length - to.ch;}
        if (marker.collapsed) {
          if (curLine == to.line) collapsedAtEnd = collapsedSpanAt(line, to.ch);
          if (curLine == from.line) collapsedAtStart = collapsedSpanAt(line, from.ch);
          else updateLineHeight(line, 0);
        }
        addMarkedSpan(line, span);
        ++curLine;
      });
      if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {
        if (lineIsHidden(doc, line)) updateLineHeight(line, 0);
      });
  
      if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });
  
      if (marker.readOnly) {
        sawReadOnlySpans = true;
        if (doc.history.done.length || doc.history.undone.length)
          doc.clearHistory();
      }
      if (marker.collapsed) {
        if (collapsedAtStart != collapsedAtEnd)
          throw new Error("Inserting collapsed marker overlapping an existing one");
        marker.size = size;
        marker.atomic = true;
      }
      if (cm) {
        if (updateMaxLine) cm.curOp.updateMaxLine = true;
        if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.collapsed)
          regChange(cm, from.line, to.line + 1);
        if (marker.atomic) reCheckSelection(cm);
      }
      return marker;
    }
  
    // SHARED TEXTMARKERS
  
    function SharedTextMarker(markers, primary) {
      this.markers = markers;
      this.primary = primary;
      for (var i = 0, me = this; i < markers.length; ++i) {
        markers[i].parent = this;
        on(markers[i], "clear", function(){me.clear();});
      }
    }
    CodeMirror.SharedTextMarker = SharedTextMarker;
    eventMixin(SharedTextMarker);
  
    SharedTextMarker.prototype.clear = function() {
      if (this.explicitlyCleared) return;
      this.explicitlyCleared = true;
      for (var i = 0; i < this.markers.length; ++i)
        this.markers[i].clear();
      signalLater(this, "clear");
    };
    SharedTextMarker.prototype.find = function() {
      return this.primary.find();
    };
  
    function markTextShared(doc, from, to, options, type) {
      options = copyObj(options);
      options.shared = false;
      var markers = [markText(doc, from, to, options, type)], primary = markers[0];
      var widget = options.replacedWith;
      linkedDocs(doc, function(doc) {
        if (widget) options.replacedWith = widget.cloneNode(true);
        markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
        for (var i = 0; i < doc.linked.length; ++i)
          if (doc.linked[i].isParent) return;
        primary = lst(markers);
      });
      return new SharedTextMarker(markers, primary);
    }
  
    // TEXTMARKER SPANS
  
    function getMarkedSpanFor(spans, marker) {
      if (spans) for (var i = 0; i < spans.length; ++i) {
        var span = spans[i];
        if (span.marker == marker) return span;
      }
    }
    function removeMarkedSpan(spans, span) {
      for (var r, i = 0; i < spans.length; ++i)
        if (spans[i] != span) (r || (r = [])).push(spans[i]);
      return r;
    }
    function addMarkedSpan(line, span) {
      line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
      span.marker.attachLine(line);
    }
  
    function markedSpansBefore(old, startCh, isInsert) {
      if (old) for (var i = 0, nw; i < old.length; ++i) {
        var span = old[i], marker = span.marker;
        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
        if (startsBefore || marker.type == "bookmark" && span.from == startCh && (!isInsert || !span.marker.insertLeft)) {
          var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
          (nw || (nw = [])).push({from: span.from,
                                  to: endsAfter ? null : span.to,
                                  marker: marker});
        }
      }
      return nw;
    }
  
    function markedSpansAfter(old, endCh, isInsert) {
      if (old) for (var i = 0, nw; i < old.length; ++i) {
        var span = old[i], marker = span.marker;
        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
        if (endsAfter || marker.type == "bookmark" && span.from == endCh && (!isInsert || span.marker.insertLeft)) {
          var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
          (nw || (nw = [])).push({from: startsBefore ? null : span.from - endCh,
                                  to: span.to == null ? null : span.to - endCh,
                                  marker: marker});
        }
      }
      return nw;
    }
  
    function stretchSpansOverChange(doc, change) {
      var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
      var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
      if (!oldFirst && !oldLast) return null;
  
      var startCh = change.from.ch, endCh = change.to.ch, isInsert = posEq(change.from, change.to);
      // Get the spans that 'stick out' on both sides
      var first = markedSpansBefore(oldFirst, startCh, isInsert);
      var last = markedSpansAfter(oldLast, endCh, isInsert);
  
      // Next, merge those two ends
      var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
      if (first) {
        // Fix up .to properties of first
        for (var i = 0; i < first.length; ++i) {
          var span = first[i];
          if (span.to == null) {
            var found = getMarkedSpanFor(last, span.marker);
            if (!found) span.to = startCh;
            else if (sameLine) span.to = found.to == null ? null : found.to + offset;
          }
        }
      }
      if (last) {
        // Fix up .from in last (or move them into first in case of sameLine)
        for (var i = 0; i < last.length; ++i) {
          var span = last[i];
          if (span.to != null) span.to += offset;
          if (span.from == null) {
            var found = getMarkedSpanFor(first, span.marker);
            if (!found) {
              span.from = offset;
              if (sameLine) (first || (first = [])).push(span);
            }
          } else {
            span.from += offset;
            if (sameLine) (first || (first = [])).push(span);
          }
        }
      }
      if (sameLine && first) {
        // Make sure we didn't create any zero-length spans
        for (var i = 0; i < first.length; ++i)
          if (first[i].from != null && first[i].from == first[i].to && first[i].marker.type != "bookmark")
            first.splice(i--, 1);
        if (!first.length) first = null;
      }
  
      var newMarkers = [first];
      if (!sameLine) {
        // Fill gap with whole-line-spans
        var gap = change.text.length - 2, gapMarkers;
        if (gap > 0 && first)
          for (var i = 0; i < first.length; ++i)
            if (first[i].to == null)
              (gapMarkers || (gapMarkers = [])).push({from: null, to: null, marker: first[i].marker});
        for (var i = 0; i < gap; ++i)
          newMarkers.push(gapMarkers);
        newMarkers.push(last);
      }
      return newMarkers;
    }
  
    function mergeOldSpans(doc, change) {
      var old = getOldSpans(doc, change);
      var stretched = stretchSpansOverChange(doc, change);
      if (!old) return stretched;
      if (!stretched) return old;
  
      for (var i = 0; i < old.length; ++i) {
        var oldCur = old[i], stretchCur = stretched[i];
        if (oldCur && stretchCur) {
          spans: for (var j = 0; j < stretchCur.length; ++j) {
            var span = stretchCur[j];
            for (var k = 0; k < oldCur.length; ++k)
              if (oldCur[k].marker == span.marker) continue spans;
            oldCur.push(span);
          }
        } else if (stretchCur) {
          old[i] = stretchCur;
        }
      }
      return old;
    }
  
    function removeReadOnlyRanges(doc, from, to) {
      var markers = null;
      doc.iter(from.line, to.line + 1, function(line) {
        if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
          var mark = line.markedSpans[i].marker;
          if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
            (markers || (markers = [])).push(mark);
        }
      });
      if (!markers) return null;
      var parts = [{from: from, to: to}];
      for (var i = 0; i < markers.length; ++i) {
        var mk = markers[i], m = mk.find();
        for (var j = 0; j < parts.length; ++j) {
          var p = parts[j];
          if (posLess(p.to, m.from) || posLess(m.to, p.from)) continue;
          var newParts = [j, 1];
          if (posLess(p.from, m.from) || !mk.inclusiveLeft && posEq(p.from, m.from))
            newParts.push({from: p.from, to: m.from});
          if (posLess(m.to, p.to) || !mk.inclusiveRight && posEq(p.to, m.to))
            newParts.push({from: m.to, to: p.to});
          parts.splice.apply(parts, newParts);
          j += newParts.length - 1;
        }
      }
      return parts;
    }
  
    function collapsedSpanAt(line, ch) {
      var sps = sawCollapsedSpans && line.markedSpans, found;
      if (sps) for (var sp, i = 0; i < sps.length; ++i) {
        sp = sps[i];
        if (!sp.marker.collapsed) continue;
        if ((sp.from == null || sp.from < ch) &&
            (sp.to == null || sp.to > ch) &&
            (!found || found.width < sp.marker.width))
          found = sp.marker;
      }
      return found;
    }
    function collapsedSpanAtStart(line) { return collapsedSpanAt(line, -1); }
    function collapsedSpanAtEnd(line) { return collapsedSpanAt(line, line.text.length + 1); }
  
    function visualLine(doc, line) {
      var merged;
      while (merged = collapsedSpanAtStart(line))
        line = getLine(doc, merged.find().from.line);
      return line;
    }
  
    function lineIsHidden(doc, line) {
      var sps = sawCollapsedSpans && line.markedSpans;
      if (sps) for (var sp, i = 0; i < sps.length; ++i) {
        sp = sps[i];
        if (!sp.marker.collapsed) continue;
        if (sp.from == null) return true;
        if (sp.marker.replacedWith) continue;
        if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
          return true;
      }
    }
    function lineIsHiddenInner(doc, line, span) {
      if (span.to == null) {
        var end = span.marker.find().to, endLine = getLine(doc, end.line);
        return lineIsHiddenInner(doc, endLine, getMarkedSpanFor(endLine.markedSpans, span.marker));
      }
      if (span.marker.inclusiveRight && span.to == line.text.length)
        return true;
      for (var sp, i = 0; i < line.markedSpans.length; ++i) {
        sp = line.markedSpans[i];
        if (sp.marker.collapsed && !sp.marker.replacedWith && sp.from == span.to &&
            (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
            lineIsHiddenInner(doc, line, sp)) return true;
      }
    }
  
    function detachMarkedSpans(line) {
      var spans = line.markedSpans;
      if (!spans) return;
      for (var i = 0; i < spans.length; ++i)
        spans[i].marker.detachLine(line);
      line.markedSpans = null;
    }
  
    function attachMarkedSpans(line, spans) {
      if (!spans) return;
      for (var i = 0; i < spans.length; ++i)
        spans[i].marker.attachLine(line);
      line.markedSpans = spans;
    }
  
    // LINE WIDGETS
  
    var LineWidget = CodeMirror.LineWidget = function(cm, node, options) {
      if (options) for (var opt in options) if (options.hasOwnProperty(opt))
        this[opt] = options[opt];
      this.cm = cm;
      this.node = node;
    };
    eventMixin(LineWidget);
    function widgetOperation(f) {
      return function() {
        var withOp = !this.cm.curOp;
        if (withOp) startOperation(this.cm);
        try {var result = f.apply(this, arguments);}
        finally {if (withOp) endOperation(this.cm);}
        return result;
      };
    }
    LineWidget.prototype.clear = widgetOperation(function() {
      var ws = this.line.widgets, no = lineNo(this.line);
      if (no == null || !ws) return;
      for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
      if (!ws.length) this.line.widgets = null;
      var aboveVisible = heightAtLine(this.cm, this.line) < this.cm.doc.scrollTop;
      updateLineHeight(this.line, Math.max(0, this.line.height - widgetHeight(this)));
      if (aboveVisible) addToScrollPos(this.cm, 0, -this.height);
      regChange(this.cm, no, no + 1);
    });
    LineWidget.prototype.changed = widgetOperation(function() {
      var oldH = this.height;
      this.height = null;
      var diff = widgetHeight(this) - oldH;
      if (!diff) return;
      updateLineHeight(this.line, this.line.height + diff);
      var no = lineNo(this.line);
      regChange(this.cm, no, no + 1);
    });
  
    function widgetHeight(widget) {
      if (widget.height != null) return widget.height;
      if (!widget.node.parentNode || widget.node.parentNode.nodeType != 1)
        removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, "position: relative"));
      return widget.height = widget.node.offsetHeight;
    }
  
    function addLineWidget(cm, handle, node, options) {
      var widget = new LineWidget(cm, node, options);
      if (widget.noHScroll) cm.display.alignWidgets = true;
      changeLine(cm, handle, function(line) {
        var widgets = line.widgets || (line.widgets = []);
        if (widget.insertAt == null) widgets.push(widget);
        else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
        widget.line = line;
        if (!lineIsHidden(cm.doc, line) || widget.showIfHidden) {
          var aboveVisible = heightAtLine(cm, line) < cm.doc.scrollTop;
          updateLineHeight(line, line.height + widgetHeight(widget));
          if (aboveVisible) addToScrollPos(cm, 0, widget.height);
        }
        return true;
      });
      return widget;
    }
  
    // LINE DATA STRUCTURE
  
    // Line objects. These hold state related to a line, including
    // highlighting info (the styles array).
    var Line = CodeMirror.Line = function(text, markedSpans, estimateHeight) {
      this.text = text;
      attachMarkedSpans(this, markedSpans);
      this.height = estimateHeight ? estimateHeight(this) : 1;
    };
    eventMixin(Line);
  
    function updateLine(line, text, markedSpans, estimateHeight) {
      line.text = text;
      if (line.stateAfter) line.stateAfter = null;
      if (line.styles) line.styles = null;
      if (line.order != null) line.order = null;
      detachMarkedSpans(line);
      attachMarkedSpans(line, markedSpans);
      var estHeight = estimateHeight ? estimateHeight(line) : 1;
      if (estHeight != line.height) updateLineHeight(line, estHeight);
    }
  
    function cleanUpLine(line) {
      line.parent = null;
      detachMarkedSpans(line);
    }
  
    // Run the given mode's parser over a line, update the styles
    // array, which contains alternating fragments of text and CSS
    // classes.
    function runMode(cm, text, mode, state, f) {
      var flattenSpans = mode.flattenSpans;
      if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;
      var curStart = 0, curStyle = null;
      var stream = new StringStream(text, cm.options.tabSize), style;
      if (text == "" && mode.blankLine) mode.blankLine(state);
      while (!stream.eol()) {
        if (stream.pos > cm.options.maxHighlightLength) {
          flattenSpans = false;
          stream.pos = text.length;
          style = null;
        } else {
          style = mode.token(stream, state);
        }
        if (!flattenSpans || curStyle != style) {
          if (curStart < stream.start) f(stream.start, curStyle);
          curStart = stream.start; curStyle = style;
        }
        stream.start = stream.pos;
      }
      while (curStart < stream.pos) {
        // Webkit seems to refuse to render text nodes longer than 57444 characters
        var pos = Math.min(stream.pos, curStart + 50000);
        f(pos, curStyle);
        curStart = pos;
      }
    }
  
    function highlightLine(cm, line, state) {
      // A styles array always starts with a number identifying the
      // mode/overlays that it is based on (for easy invalidation).
      var st = [cm.state.modeGen];
      // Compute the base array of styles
      runMode(cm, line.text, cm.doc.mode, state, function(end, style) {st.push(end, style);});
  
      // Run overlays, adjust style array.
      for (var o = 0; o < cm.state.overlays.length; ++o) {
        var overlay = cm.state.overlays[o], i = 1, at = 0;
        runMode(cm, line.text, overlay.mode, true, function(end, style) {
          var start = i;
          // Ensure there's a token end at the current position, and that i points at it
          while (at < end) {
            var i_end = st[i];
            if (i_end > end)
              st.splice(i, 1, end, st[i+1], i_end);
            i += 2;
            at = Math.min(end, i_end);
          }
          if (!style) return;
          if (overlay.opaque) {
            st.splice(start, i - start, end, style);
            i = start + 2;
          } else {
            for (; start < i; start += 2) {
              var cur = st[start+1];
              st[start+1] = cur ? cur + " " + style : style;
            }
          }
        });
      }
  
      return st;
    }
  
    function getLineStyles(cm, line) {
      if (!line.styles || line.styles[0] != cm.state.modeGen)
        line.styles = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
      return line.styles;
    }
  
    // Lightweight form of highlight -- proceed over this line and
    // update state, but don't save a style array.
    function processLine(cm, line, state) {
      var mode = cm.doc.mode;
      var stream = new StringStream(line.text, cm.options.tabSize);
      if (line.text == "" && mode.blankLine) mode.blankLine(state);
      while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
        mode.token(stream, state);
        stream.start = stream.pos;
      }
    }
  
    var styleToClassCache = {};
    function interpretTokenStyle(style, builder) {
      if (!style) return null;
      for (;;) {
        var lineClass = style.match(/(?:^|\s)line-(background-)?(\S+)/);
        if (!lineClass) break;
        style = style.slice(0, lineClass.index) + style.slice(lineClass.index + lineClass[0].length);
        var prop = lineClass[1] ? "bgClass" : "textClass";
        if (builder[prop] == null)
          builder[prop] = lineClass[2];
        else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(builder[prop]))
          builder[prop] += " " + lineClass[2];
      }
      return styleToClassCache[style] ||
        (styleToClassCache[style] = "cm-" + style.replace(/ +/g, " cm-"));
    }
  
    function buildLineContent(cm, realLine, measure, copyWidgets) {
      var merged, line = realLine, empty = true;
      while (merged = collapsedSpanAtStart(line))
        line = getLine(cm.doc, merged.find().from.line);
  
      var builder = {pre: elt("pre"), col: 0, pos: 0,
                     measure: null, measuredSomething: false, cm: cm,
                     copyWidgets: copyWidgets};
  
      do {
        if (line.text) empty = false;
        builder.measure = line == realLine && measure;
        builder.pos = 0;
        builder.addToken = builder.measure ? buildTokenMeasure : buildToken;
        if ((ie || webkit) && cm.getOption("lineWrapping"))
          builder.addToken = buildTokenSplitSpaces(builder.addToken);
        var next = insertLineContent(line, builder, getLineStyles(cm, line));
        if (measure && line == realLine && !builder.measuredSomething) {
          measure[0] = builder.pre.appendChild(zeroWidthElement(cm.display.measure));
          builder.measuredSomething = true;
        }
        if (next) line = getLine(cm.doc, next.to.line);
      } while (next);
  
      if (measure && !builder.measuredSomething && !measure[0])
        measure[0] = builder.pre.appendChild(empty ? elt("span", "\u00a0") : zeroWidthElement(cm.display.measure));
      if (!builder.pre.firstChild && !lineIsHidden(cm.doc, realLine))
        builder.pre.appendChild(document.createTextNode("\u00a0"));
  
      var order;
      // Work around problem with the reported dimensions of single-char
      // direction spans on IE (issue #1129). See also the comment in
      // cursorCoords.
      if (measure && ie && (order = getOrder(line))) {
        var l = order.length - 1;
        if (order[l].from == order[l].to) --l;
        var last = order[l], prev = order[l - 1];
        if (last.from + 1 == last.to && prev && last.level < prev.level) {
          var span = measure[builder.pos - 1];
          if (span) span.parentNode.insertBefore(span.measureRight = zeroWidthElement(cm.display.measure),
                                                 span.nextSibling);
        }
      }
  
      var textClass = builder.textClass ? builder.textClass + " " + (realLine.textClass || "") : realLine.textClass;
      if (textClass) builder.pre.className = textClass;
  
      signal(cm, "renderLine", cm, realLine, builder.pre);
      return builder;
    }
  
    var tokenSpecialChars = /[\t\u0000-\u0019\u00ad\u200b\u2028\u2029\uFEFF]/g;
    function buildToken(builder, text, style, startStyle, endStyle, title) {
      if (!text) return;
      if (!tokenSpecialChars.test(text)) {
        builder.col += text.length;
        var content = document.createTextNode(text);
      } else {
        var content = document.createDocumentFragment(), pos = 0;
        while (true) {
          tokenSpecialChars.lastIndex = pos;
          var m = tokenSpecialChars.exec(text);
          var skipped = m ? m.index - pos : text.length - pos;
          if (skipped) {
            content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));
            builder.col += skipped;
          }
          if (!m) break;
          pos += skipped + 1;
          if (m[0] == "\t") {
            var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
            content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
            builder.col += tabWidth;
          } else {
            var token = elt("span", "\u2022", "cm-invalidchar");
            token.title = "\\u" + m[0].charCodeAt(0).toString(16);
            content.appendChild(token);
            builder.col += 1;
          }
        }
      }
      if (style || startStyle || endStyle || builder.measure) {
        var fullStyle = style || "";
        if (startStyle) fullStyle += startStyle;
        if (endStyle) fullStyle += endStyle;
        var token = elt("span", [content], fullStyle);
        if (title) token.title = title;
        return builder.pre.appendChild(token);
      }
      builder.pre.appendChild(content);
    }
  
    function buildTokenMeasure(builder, text, style, startStyle, endStyle) {
      var wrapping = builder.cm.options.lineWrapping;
      for (var i = 0; i < text.length; ++i) {
        var ch = text.charAt(i), start = i == 0;
        if (ch >= "\ud800" && ch < "\udbff" && i < text.length - 1) {
          ch = text.slice(i, i + 2);
          ++i;
        } else if (i && wrapping && spanAffectsWrapping(text, i)) {
          builder.pre.appendChild(elt("wbr"));
        }
        var old = builder.measure[builder.pos];
        var span = builder.measure[builder.pos] =
          buildToken(builder, ch, style,
                     start && startStyle, i == text.length - 1 && endStyle);
        if (old) span.leftSide = old.leftSide || old;
        // In IE single-space nodes wrap differently than spaces
        // embedded in larger text nodes, except when set to
        // white-space: normal (issue #1268).
        if (ie && wrapping && ch == " " && i && !/\s/.test(text.charAt(i - 1)) &&
            i < text.length - 1 && !/\s/.test(text.charAt(i + 1)))
          span.style.whiteSpace = "normal";
        builder.pos += ch.length;
      }
      if (text.length) builder.measuredSomething = true;
    }
  
    function buildTokenSplitSpaces(inner) {
      function split(old) {
        var out = " ";
        for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
        out += " ";
        return out;
      }
      return function(builder, text, style, startStyle, endStyle, title) {
        return inner(builder, text.replace(/ {3,}/g, split), style, startStyle, endStyle, title);
      };
    }
  
    function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
      var widget = !ignoreWidget && marker.replacedWith;
      if (widget) {
        if (builder.copyWidgets) widget = widget.cloneNode(true);
        builder.pre.appendChild(widget);
        if (builder.measure) {
          if (size) {
            builder.measure[builder.pos] = widget;
          } else {
            var elt = zeroWidthElement(builder.cm.display.measure);
            if (marker.type == "bookmark" && !marker.insertLeft)
              builder.measure[builder.pos] = builder.pre.appendChild(elt);
            else if (builder.measure[builder.pos])
              return;
            else
              builder.measure[builder.pos] = builder.pre.insertBefore(elt, widget);
          }
          builder.measuredSomething = true;
        }
      }
      builder.pos += size;
    }
  
    // Outputs a number of spans to make up a line, taking highlighting
    // and marked text into account.
    function insertLineContent(line, builder, styles) {
      var spans = line.markedSpans, allText = line.text, at = 0;
      if (!spans) {
        for (var i = 1; i < styles.length; i+=2)
          builder.addToken(builder, allText.slice(at, at = styles[i]), interpretTokenStyle(styles[i+1], builder));
        return;
      }
  
      var len = allText.length, pos = 0, i = 1, text = "", style;
      var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
      for (;;) {
        if (nextChange == pos) { // Update current marker set
          spanStyle = spanEndStyle = spanStartStyle = title = "";
          collapsed = null; nextChange = Infinity;
          var foundBookmarks = [];
          for (var j = 0; j < spans.length; ++j) {
            var sp = spans[j], m = sp.marker;
            if (sp.from <= pos && (sp.to == null || sp.to > pos)) {
              if (sp.to != null && nextChange > sp.to) { nextChange = sp.to; spanEndStyle = ""; }
              if (m.className) spanStyle += " " + m.className;
              if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
              if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;
              if (m.title && !title) title = m.title;
              if (m.collapsed && (!collapsed || collapsed.marker.size < m.size))
                collapsed = sp;
            } else if (sp.from > pos && nextChange > sp.from) {
              nextChange = sp.from;
            }
            if (m.type == "bookmark" && sp.from == pos && m.replacedWith) foundBookmarks.push(m);
          }
          if (collapsed && (collapsed.from || 0) == pos) {
            buildCollapsedSpan(builder, (collapsed.to == null ? len : collapsed.to) - pos,
                               collapsed.marker, collapsed.from == null);
            if (collapsed.to == null) return collapsed.marker.find();
          }
          if (!collapsed && foundBookmarks.length) for (var j = 0; j < foundBookmarks.length; ++j)
            buildCollapsedSpan(builder, 0, foundBookmarks[j]);
        }
        if (pos >= len) break;
  
        var upto = Math.min(len, nextChange);
        while (true) {
          if (text) {
            var end = pos + text.length;
            if (!collapsed) {
              var tokenText = end > upto ? text.slice(0, upto - pos) : text;
              builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                               spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title);
            }
            if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
            pos = end;
            spanStartStyle = "";
          }
          text = allText.slice(at, at = styles[i++]);
          style = interpretTokenStyle(styles[i++], builder);
        }
      }
    }
  
    // DOCUMENT DATA STRUCTURE
  
    function updateDoc(doc, change, markedSpans, selAfter, estimateHeight) {
      function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
      function update(line, text, spans) {
        updateLine(line, text, spans, estimateHeight);
        signalLater(line, "change", line, change);
      }
  
      var from = change.from, to = change.to, text = change.text;
      var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
      var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
  
      // First adjust the line structure
      if (from.ch == 0 && to.ch == 0 && lastText == "") {
        // This is a whole-line replace. Treated specially to make
        // sure line objects move the way they are supposed to.
        for (var i = 0, e = text.length - 1, added = []; i < e; ++i)
          added.push(new Line(text[i], spansFor(i), estimateHeight));
        update(lastLine, lastLine.text, lastSpans);
        if (nlines) doc.remove(from.line, nlines);
        if (added.length) doc.insert(from.line, added);
      } else if (firstLine == lastLine) {
        if (text.length == 1) {
          update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
        } else {
          for (var added = [], i = 1, e = text.length - 1; i < e; ++i)
            added.push(new Line(text[i], spansFor(i), estimateHeight));
          added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
          update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
          doc.insert(from.line + 1, added);
        }
      } else if (text.length == 1) {
        update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
        doc.remove(from.line + 1, nlines);
      } else {
        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
        update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
        for (var i = 1, e = text.length - 1, added = []; i < e; ++i)
          added.push(new Line(text[i], spansFor(i), estimateHeight));
        if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
        doc.insert(from.line + 1, added);
      }
  
      signalLater(doc, "change", doc, change);
      setSelection(doc, selAfter.anchor, selAfter.head, null, true);
    }
  
    function LeafChunk(lines) {
      this.lines = lines;
      this.parent = null;
      for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
        lines[i].parent = this;
        height += lines[i].height;
      }
      this.height = height;
    }
  
    LeafChunk.prototype = {
      chunkSize: function() { return this.lines.length; },
      removeInner: function(at, n) {
        for (var i = at, e = at + n; i < e; ++i) {
          var line = this.lines[i];
          this.height -= line.height;
          cleanUpLine(line);
          signalLater(line, "delete");
        }
        this.lines.splice(at, n);
      },
      collapse: function(lines) {
        lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
      },
      insertInner: function(at, lines, height) {
        this.height += height;
        this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
        for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
      },
      iterN: function(at, n, op) {
        for (var e = at + n; at < e; ++at)
          if (op(this.lines[at])) return true;
      }
    };
  
    function BranchChunk(children) {
      this.children = children;
      var size = 0, height = 0;
      for (var i = 0, e = children.length; i < e; ++i) {
        var ch = children[i];
        size += ch.chunkSize(); height += ch.height;
        ch.parent = this;
      }
      this.size = size;
      this.height = height;
      this.parent = null;
    }
  
    BranchChunk.prototype = {
      chunkSize: function() { return this.size; },
      removeInner: function(at, n) {
        this.size -= n;
        for (var i = 0; i < this.children.length; ++i) {
          var child = this.children[i], sz = child.chunkSize();
          if (at < sz) {
            var rm = Math.min(n, sz - at), oldHeight = child.height;
            child.removeInner(at, rm);
            this.height -= oldHeight - child.height;
            if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
            if ((n -= rm) == 0) break;
            at = 0;
          } else at -= sz;
        }
        if (this.size - n < 25) {
          var lines = [];
          this.collapse(lines);
          this.children = [new LeafChunk(lines)];
          this.children[0].parent = this;
        }
      },
      collapse: function(lines) {
        for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
      },
      insertInner: function(at, lines, height) {
        this.size += lines.length;
        this.height += height;
        for (var i = 0, e = this.children.length; i < e; ++i) {
          var child = this.children[i], sz = child.chunkSize();
          if (at <= sz) {
            child.insertInner(at, lines, height);
            if (child.lines && child.lines.length > 50) {
              while (child.lines.length > 50) {
                var spilled = child.lines.splice(child.lines.length - 25, 25);
                var newleaf = new LeafChunk(spilled);
                child.height -= newleaf.height;
                this.children.splice(i + 1, 0, newleaf);
                newleaf.parent = this;
              }
              this.maybeSpill();
            }
            break;
          }
          at -= sz;
        }
      },
      maybeSpill: function() {
        if (this.children.length <= 10) return;
        var me = this;
        do {
          var spilled = me.children.splice(me.children.length - 5, 5);
          var sibling = new BranchChunk(spilled);
          if (!me.parent) { // Become the parent node
            var copy = new BranchChunk(me.children);
            copy.parent = me;
            me.children = [copy, sibling];
            me = copy;
          } else {
            me.size -= sibling.size;
            me.height -= sibling.height;
            var myIndex = indexOf(me.parent.children, me);
            me.parent.children.splice(myIndex + 1, 0, sibling);
          }
          sibling.parent = me.parent;
        } while (me.children.length > 10);
        me.parent.maybeSpill();
      },
      iterN: function(at, n, op) {
        for (var i = 0, e = this.children.length; i < e; ++i) {
          var child = this.children[i], sz = child.chunkSize();
          if (at < sz) {
            var used = Math.min(n, sz - at);
            if (child.iterN(at, used, op)) return true;
            if ((n -= used) == 0) break;
            at = 0;
          } else at -= sz;
        }
      }
    };
  
    var nextDocId = 0;
    var Doc = CodeMirror.Doc = function(text, mode, firstLine) {
      if (!(this instanceof Doc)) return new Doc(text, mode, firstLine);
      if (firstLine == null) firstLine = 0;
  
      BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
      this.first = firstLine;
      this.scrollTop = this.scrollLeft = 0;
      this.cantEdit = false;
      this.history = makeHistory();
      this.cleanGeneration = 1;
      this.frontier = firstLine;
      var start = Pos(firstLine, 0);
      this.sel = {from: start, to: start, head: start, anchor: start, shift: false, extend: false, goalColumn: null};
      this.id = ++nextDocId;
      this.modeOption = mode;
  
      if (typeof text == "string") text = splitLines(text);
      updateDoc(this, {from: start, to: start, text: text}, null, {head: start, anchor: start});
    };
  
    Doc.prototype = createObj(BranchChunk.prototype, {
      constructor: Doc,
      iter: function(from, to, op) {
        if (op) this.iterN(from - this.first, to - from, op);
        else this.iterN(this.first, this.first + this.size, from);
      },
  
      insert: function(at, lines) {
        var height = 0;
        for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
        this.insertInner(at - this.first, lines, height);
      },
      remove: function(at, n) { this.removeInner(at - this.first, n); },
  
      getValue: function(lineSep) {
        var lines = getLines(this, this.first, this.first + this.size);
        if (lineSep === false) return lines;
        return lines.join(lineSep || "\n");
      },
      setValue: function(code) {
        var top = Pos(this.first, 0), last = this.first + this.size - 1;
        makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
                          text: splitLines(code), origin: "setValue"},
                   {head: top, anchor: top}, true);
      },
      replaceRange: function(code, from, to, origin) {
        from = clipPos(this, from);
        to = to ? clipPos(this, to) : from;
        replaceRange(this, code, from, to, origin);
      },
      getRange: function(from, to, lineSep) {
        var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
        if (lineSep === false) return lines;
        return lines.join(lineSep || "\n");
      },
  
      getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
      setLine: function(line, text) {
        if (isLine(this, line))
          replaceRange(this, text, Pos(line, 0), clipPos(this, Pos(line)));
      },
      removeLine: function(line) {
        if (line) replaceRange(this, "", clipPos(this, Pos(line - 1)), clipPos(this, Pos(line)));
        else replaceRange(this, "", Pos(0, 0), clipPos(this, Pos(1, 0)));
      },
  
      getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
      getLineNumber: function(line) {return lineNo(line);},
  
      getLineHandleVisualStart: function(line) {
        if (typeof line == "number") line = getLine(this, line);
        return visualLine(this, line);
      },
  
      lineCount: function() {return this.size;},
      firstLine: function() {return this.first;},
      lastLine: function() {return this.first + this.size - 1;},
  
      clipPos: function(pos) {return clipPos(this, pos);},
  
      getCursor: function(start) {
        var sel = this.sel, pos;
        if (start == null || start == "head") pos = sel.head;
        else if (start == "anchor") pos = sel.anchor;
        else if (start == "end" || start === false) pos = sel.to;
        else pos = sel.from;
        return copyPos(pos);
      },
      somethingSelected: function() {return !posEq(this.sel.head, this.sel.anchor);},
  
      setCursor: docOperation(function(line, ch, extend) {
        var pos = clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line);
        if (extend) extendSelection(this, pos);
        else setSelection(this, pos, pos);
      }),
      setSelection: docOperation(function(anchor, head, bias) {
        setSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), bias);
      }),
      extendSelection: docOperation(function(from, to, bias) {
        extendSelection(this, clipPos(this, from), to && clipPos(this, to), bias);
      }),
  
      getSelection: function(lineSep) {return this.getRange(this.sel.from, this.sel.to, lineSep);},
      replaceSelection: function(code, collapse, origin) {
        makeChange(this, {from: this.sel.from, to: this.sel.to, text: splitLines(code), origin: origin}, collapse || "around");
      },
      undo: docOperation(function() {makeChangeFromHistory(this, "undo");}),
      redo: docOperation(function() {makeChangeFromHistory(this, "redo");}),
  
      setExtending: function(val) {this.sel.extend = val;},
  
      historySize: function() {
        var hist = this.history;
        return {undo: hist.done.length, redo: hist.undone.length};
      },
      clearHistory: function() {this.history = makeHistory(this.history.maxGeneration);},
  
      markClean: function() {
        this.cleanGeneration = this.changeGeneration();
      },
      changeGeneration: function() {
        this.history.lastOp = this.history.lastOrigin = null;
        return this.history.generation;
      },
      isClean: function (gen) {
        return this.history.generation == (gen || this.cleanGeneration);
      },
  
      getHistory: function() {
        return {done: copyHistoryArray(this.history.done),
                undone: copyHistoryArray(this.history.undone)};
      },
      setHistory: function(histData) {
        var hist = this.history = makeHistory(this.history.maxGeneration);
        hist.done = histData.done.slice(0);
        hist.undone = histData.undone.slice(0);
      },
  
      markText: function(from, to, options) {
        return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
      },
      setBookmark: function(pos, options) {
        var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
                        insertLeft: options && options.insertLeft};
        pos = clipPos(this, pos);
        return markText(this, pos, pos, realOpts, "bookmark");
      },
      findMarksAt: function(pos) {
        pos = clipPos(this, pos);
        var markers = [], spans = getLine(this, pos.line).markedSpans;
        if (spans) for (var i = 0; i < spans.length; ++i) {
          var span = spans[i];
          if ((span.from == null || span.from <= pos.ch) &&
              (span.to == null || span.to >= pos.ch))
            markers.push(span.marker.parent || span.marker);
        }
        return markers;
      },
      getAllMarks: function() {
        var markers = [];
        this.iter(function(line) {
          var sps = line.markedSpans;
          if (sps) for (var i = 0; i < sps.length; ++i)
            if (sps[i].from != null) markers.push(sps[i].marker);
        });
        return markers;
      },
  
      posFromIndex: function(off) {
        var ch, lineNo = this.first;
        this.iter(function(line) {
          var sz = line.text.length + 1;
          if (sz > off) { ch = off; return true; }
          off -= sz;
          ++lineNo;
        });
        return clipPos(this, Pos(lineNo, ch));
      },
      indexFromPos: function (coords) {
        coords = clipPos(this, coords);
        var index = coords.ch;
        if (coords.line < this.first || coords.ch < 0) return 0;
        this.iter(this.first, coords.line, function (line) {
          index += line.text.length + 1;
        });
        return index;
      },
  
      copy: function(copyHistory) {
        var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);
        doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
        doc.sel = {from: this.sel.from, to: this.sel.to, head: this.sel.head, anchor: this.sel.anchor,
                   shift: this.sel.shift, extend: false, goalColumn: this.sel.goalColumn};
        if (copyHistory) {
          doc.history.undoDepth = this.history.undoDepth;
          doc.setHistory(this.getHistory());
        }
        return doc;
      },
  
      linkedDoc: function(options) {
        if (!options) options = {};
        var from = this.first, to = this.first + this.size;
        if (options.from != null && options.from > from) from = options.from;
        if (options.to != null && options.to < to) to = options.to;
        var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);
        if (options.sharedHist) copy.history = this.history;
        (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
        copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
        return copy;
      },
      unlinkDoc: function(other) {
        if (other instanceof CodeMirror) other = other.doc;
        if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
          var link = this.linked[i];
          if (link.doc != other) continue;
          this.linked.splice(i, 1);
          other.unlinkDoc(this);
          break;
        }
        // If the histories were shared, split them again
        if (other.history == this.history) {
          var splitIds = [other.id];
          linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
          other.history = makeHistory();
          other.history.done = copyHistoryArray(this.history.done, splitIds);
          other.history.undone = copyHistoryArray(this.history.undone, splitIds);
        }
      },
      iterLinkedDocs: function(f) {linkedDocs(this, f);},
  
      getMode: function() {return this.mode;},
      getEditor: function() {return this.cm;}
    });
  
    Doc.prototype.eachLine = Doc.prototype.iter;
  
    // The Doc methods that should be available on CodeMirror instances
    var dontDelegate = "iter insert remove copy getEditor".split(" ");
    for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
      CodeMirror.prototype[prop] = (function(method) {
        return function() {return method.apply(this.doc, arguments);};
      })(Doc.prototype[prop]);
  
    eventMixin(Doc);
  
    function linkedDocs(doc, f, sharedHistOnly) {
      function propagate(doc, skip, sharedHist) {
        if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {
          var rel = doc.linked[i];
          if (rel.doc == skip) continue;
          var shared = sharedHist && rel.sharedHist;
          if (sharedHistOnly && !shared) continue;
          f(rel.doc, shared);
          propagate(rel.doc, doc, shared);
        }
      }
      propagate(doc, null, true);
    }
  
    function attachDoc(cm, doc) {
      if (doc.cm) throw new Error("This document is already in use.");
      cm.doc = doc;
      doc.cm = cm;
      estimateLineHeights(cm);
      loadMode(cm);
      if (!cm.options.lineWrapping) computeMaxLength(cm);
      cm.options.mode = doc.modeOption;
      regChange(cm);
    }
  
    // LINE UTILITIES
  
    function getLine(chunk, n) {
      n -= chunk.first;
      while (!chunk.lines) {
        for (var i = 0;; ++i) {
          var child = chunk.children[i], sz = child.chunkSize();
          if (n < sz) { chunk = child; break; }
          n -= sz;
        }
      }
      return chunk.lines[n];
    }
  
    function getBetween(doc, start, end) {
      var out = [], n = start.line;
      doc.iter(start.line, end.line + 1, function(line) {
        var text = line.text;
        if (n == end.line) text = text.slice(0, end.ch);
        if (n == start.line) text = text.slice(start.ch);
        out.push(text);
        ++n;
      });
      return out;
    }
    function getLines(doc, from, to) {
      var out = [];
      doc.iter(from, to, function(line) { out.push(line.text); });
      return out;
    }
  
    function updateLineHeight(line, height) {
      var diff = height - line.height;
      for (var n = line; n; n = n.parent) n.height += diff;
    }
  
    function lineNo(line) {
      if (line.parent == null) return null;
      var cur = line.parent, no = indexOf(cur.lines, line);
      for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
        for (var i = 0;; ++i) {
          if (chunk.children[i] == cur) break;
          no += chunk.children[i].chunkSize();
        }
      }
      return no + cur.first;
    }
  
    function lineAtHeight(chunk, h) {
      var n = chunk.first;
      outer: do {
        for (var i = 0, e = chunk.children.length; i < e; ++i) {
          var child = chunk.children[i], ch = child.height;
          if (h < ch) { chunk = child; continue outer; }
          h -= ch;
          n += child.chunkSize();
        }
        return n;
      } while (!chunk.lines);
      for (var i = 0, e = chunk.lines.length; i < e; ++i) {
        var line = chunk.lines[i], lh = line.height;
        if (h < lh) break;
        h -= lh;
      }
      return n + i;
    }
  
    function heightAtLine(cm, lineObj) {
      lineObj = visualLine(cm.doc, lineObj);
  
      var h = 0, chunk = lineObj.parent;
      for (var i = 0; i < chunk.lines.length; ++i) {
        var line = chunk.lines[i];
        if (line == lineObj) break;
        else h += line.height;
      }
      for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
        for (var i = 0; i < p.children.length; ++i) {
          var cur = p.children[i];
          if (cur == chunk) break;
          else h += cur.height;
        }
      }
      return h;
    }
  
    function getOrder(line) {
      var order = line.order;
      if (order == null) order = line.order = bidiOrdering(line.text);
      return order;
    }
  
    // HISTORY
  
    function makeHistory(startGen) {
      return {
        // Arrays of history events. Doing something adds an event to
        // done and clears undo. Undoing moves events from done to
        // undone, redoing moves them in the other direction.
        done: [], undone: [], undoDepth: Infinity,
        // Used to track when changes can be merged into a single undo
        // event
        lastTime: 0, lastOp: null, lastOrigin: null,
        // Used by the isClean() method
        generation: startGen || 1, maxGeneration: startGen || 1
      };
    }
  
    function attachLocalSpans(doc, change, from, to) {
      var existing = change["spans_" + doc.id], n = 0;
      doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
        if (line.markedSpans)
          (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
        ++n;
      });
    }
  
    function historyChangeFromChange(doc, change) {
      var from = { line: change.from.line, ch: change.from.ch };
      var histChange = {from: from, to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
      attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
      linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);
      return histChange;
    }
  
    function addToHistory(doc, change, selAfter, opId) {
      var hist = doc.history;
      hist.undone.length = 0;
      var time = +new Date, cur = lst(hist.done);
  
      if (cur &&
          (hist.lastOp == opId ||
           hist.lastOrigin == change.origin && change.origin &&
           ((change.origin.charAt(0) == "+" && doc.cm && hist.lastTime > time - doc.cm.options.historyEventDelay) ||
            change.origin.charAt(0) == "*"))) {
        // Merge this change into the last event
        var last = lst(cur.changes);
        if (posEq(change.from, change.to) && posEq(change.from, last.to)) {
          // Optimized case for simple insertion -- don't want to add
          // new changesets for every character typed
          last.to = changeEnd(change);
        } else {
          // Add new sub-event
          cur.changes.push(historyChangeFromChange(doc, change));
        }
        cur.anchorAfter = selAfter.anchor; cur.headAfter = selAfter.head;
      } else {
        // Can not be merged, start a new event.
        cur = {changes: [historyChangeFromChange(doc, change)],
               generation: hist.generation,
               anchorBefore: doc.sel.anchor, headBefore: doc.sel.head,
               anchorAfter: selAfter.anchor, headAfter: selAfter.head};
        hist.done.push(cur);
        hist.generation = ++hist.maxGeneration;
        while (hist.done.length > hist.undoDepth)
          hist.done.shift();
      }
      hist.lastTime = time;
      hist.lastOp = opId;
      hist.lastOrigin = change.origin;
    }
  
    function removeClearedSpans(spans) {
      if (!spans) return null;
      for (var i = 0, out; i < spans.length; ++i) {
        if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
        else if (out) out.push(spans[i]);
      }
      return !out ? spans : out.length ? out : null;
    }
  
    function getOldSpans(doc, change) {
      var found = change["spans_" + doc.id];
      if (!found) return null;
      for (var i = 0, nw = []; i < change.text.length; ++i)
        nw.push(removeClearedSpans(found[i]));
      return nw;
    }
  
    // Used both to provide a JSON-safe object in .getHistory, and, when
    // detaching a document, to split the history in two
    function copyHistoryArray(events, newGroup) {
      for (var i = 0, copy = []; i < events.length; ++i) {
        var event = events[i], changes = event.changes, newChanges = [];
        copy.push({changes: newChanges, anchorBefore: event.anchorBefore, headBefore: event.headBefore,
                   anchorAfter: event.anchorAfter, headAfter: event.headAfter});
        for (var j = 0; j < changes.length; ++j) {
          var change = changes[j], m;
          newChanges.push({from: change.from, to: change.to, text: change.text});
          if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
            if (indexOf(newGroup, Number(m[1])) > -1) {
              lst(newChanges)[prop] = change[prop];
              delete change[prop];
            }
          }
        }
      }
      return copy;
    }
  
    // Rebasing/resetting history to deal with externally-sourced changes
  
    function rebaseHistSel(pos, from, to, diff) {
      if (to < pos.line) {
        pos.line += diff;
      } else if (from < pos.line) {
        pos.line = from;
        pos.ch = 0;
      }
    }
  
    // Tries to rebase an array of history events given a change in the
    // document. If the change touches the same lines as the event, the
    // event, and everything 'behind' it, is discarded. If the change is
    // before the event, the event's positions are updated. Uses a
    // copy-on-write scheme for the positions, to avoid having to
    // reallocate them all on every rebase, but also avoid problems with
    // shared position objects being unsafely updated.
    function rebaseHistArray(array, from, to, diff) {
      for (var i = 0; i < array.length; ++i) {
        var sub = array[i], ok = true;
        for (var j = 0; j < sub.changes.length; ++j) {
          var cur = sub.changes[j];
          if (!sub.copied) { cur.from = copyPos(cur.from); cur.to = copyPos(cur.to); }
          if (to < cur.from.line) {
            cur.from.line += diff;
            cur.to.line += diff;
          } else if (from <= cur.to.line) {
            ok = false;
            break;
          }
        }
        if (!sub.copied) {
          sub.anchorBefore = copyPos(sub.anchorBefore); sub.headBefore = copyPos(sub.headBefore);
          sub.anchorAfter = copyPos(sub.anchorAfter); sub.readAfter = copyPos(sub.headAfter);
          sub.copied = true;
        }
        if (!ok) {
          array.splice(0, i + 1);
          i = 0;
        } else {
          rebaseHistSel(sub.anchorBefore); rebaseHistSel(sub.headBefore);
          rebaseHistSel(sub.anchorAfter); rebaseHistSel(sub.headAfter);
        }
      }
    }
  
    function rebaseHist(hist, change) {
      var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
      rebaseHistArray(hist.done, from, to, diff);
      rebaseHistArray(hist.undone, from, to, diff);
    }
  
    // EVENT OPERATORS
  
    function stopMethod() {e_stop(this);}
    // Ensure an event has a stop method.
    function addStop(event) {
      if (!event.stop) event.stop = stopMethod;
      return event;
    }
  
    function e_preventDefault(e) {
      if (e.preventDefault) e.preventDefault();
      else e.returnValue = false;
    }
    function e_stopPropagation(e) {
      if (e.stopPropagation) e.stopPropagation();
      else e.cancelBubble = true;
    }
    function e_defaultPrevented(e) {
      return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;
    }
    function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}
    CodeMirror.e_stop = e_stop;
    CodeMirror.e_preventDefault = e_preventDefault;
    CodeMirror.e_stopPropagation = e_stopPropagation;
  
    function e_target(e) {return e.target || e.srcElement;}
    function e_button(e) {
      var b = e.which;
      if (b == null) {
        if (e.button & 1) b = 1;
        else if (e.button & 2) b = 3;
        else if (e.button & 4) b = 2;
      }
      if (mac && e.ctrlKey && b == 1) b = 3;
      return b;
    }
  
    // EVENT HANDLING
  
    function on(emitter, type, f) {
      if (emitter.addEventListener)
        emitter.addEventListener(type, f, false);
      else if (emitter.attachEvent)
        emitter.attachEvent("on" + type, f);
      else {
        var map = emitter._handlers || (emitter._handlers = {});
        var arr = map[type] || (map[type] = []);
        arr.push(f);
      }
    }
  
    function off(emitter, type, f) {
      if (emitter.removeEventListener)
        emitter.removeEventListener(type, f, false);
      else if (emitter.detachEvent)
        emitter.detachEvent("on" + type, f);
      else {
        var arr = emitter._handlers && emitter._handlers[type];
        if (!arr) return;
        for (var i = 0; i < arr.length; ++i)
          if (arr[i] == f) { arr.splice(i, 1); break; }
      }
    }
  
    function signal(emitter, type /*, values...*/) {
      var arr = emitter._handlers && emitter._handlers[type];
      if (!arr) return;
      var args = Array.prototype.slice.call(arguments, 2);
      for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);
    }
  
    var delayedCallbacks, delayedCallbackDepth = 0;
    function signalLater(emitter, type /*, values...*/) {
      var arr = emitter._handlers && emitter._handlers[type];
      if (!arr) return;
      var args = Array.prototype.slice.call(arguments, 2);
      if (!delayedCallbacks) {
        ++delayedCallbackDepth;
        delayedCallbacks = [];
        setTimeout(fireDelayed, 0);
      }
      function bnd(f) {return function(){f.apply(null, args);};};
      for (var i = 0; i < arr.length; ++i)
        delayedCallbacks.push(bnd(arr[i]));
    }
  
    function signalDOMEvent(cm, e, override) {
      signal(cm, override || e.type, cm, e);
      return e_defaultPrevented(e) || e.codemirrorIgnore;
    }
  
    function fireDelayed() {
      --delayedCallbackDepth;
      var delayed = delayedCallbacks;
      delayedCallbacks = null;
      for (var i = 0; i < delayed.length; ++i) delayed[i]();
    }
  
    function hasHandler(emitter, type) {
      var arr = emitter._handlers && emitter._handlers[type];
      return arr && arr.length > 0;
    }
  
    CodeMirror.on = on; CodeMirror.off = off; CodeMirror.signal = signal;
  
    function eventMixin(ctor) {
      ctor.prototype.on = function(type, f) {on(this, type, f);};
      ctor.prototype.off = function(type, f) {off(this, type, f);};
    }
  
    // MISC UTILITIES
  
    // Number of pixels added to scroller and sizer to hide scrollbar
    var scrollerCutOff = 30;
  
    // Returned or thrown by various protocols to signal 'I'm not
    // handling this'.
    var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
  
    function Delayed() {this.id = null;}
    Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};
  
    // Counts the column offset in a string, taking tabs into account.
    // Used mostly to find indentation.
    function countColumn(string, end, tabSize, startIndex, startValue) {
      if (end == null) {
        end = string.search(/[^\s\u00a0]/);
        if (end == -1) end = string.length;
      }
      for (var i = startIndex || 0, n = startValue || 0; i < end; ++i) {
        if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
        else ++n;
      }
      return n;
    }
    CodeMirror.countColumn = countColumn;
  
    var spaceStrs = [""];
    function spaceStr(n) {
      while (spaceStrs.length <= n)
        spaceStrs.push(lst(spaceStrs) + " ");
      return spaceStrs[n];
    }
  
    function lst(arr) { return arr[arr.length-1]; }
  
    function selectInput(node) {
      if (ios) { // Mobile Safari apparently has a bug where select() is broken.
        node.selectionStart = 0;
        node.selectionEnd = node.value.length;
      } else {
        // Suppress mysterious IE10 errors
        try { node.select(); }
        catch(_e) {}
      }
    }
  
    function indexOf(collection, elt) {
      if (collection.indexOf) return collection.indexOf(elt);
      for (var i = 0, e = collection.length; i < e; ++i)
        if (collection[i] == elt) return i;
      return -1;
    }
  
    function createObj(base, props) {
      function Obj() {}
      Obj.prototype = base;
      var inst = new Obj();
      if (props) copyObj(props, inst);
      return inst;
    }
  
    function copyObj(obj, target) {
      if (!target) target = {};
      for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];
      return target;
    }
  
    function emptyArray(size) {
      for (var a = [], i = 0; i < size; ++i) a.push(undefined);
      return a;
    }
  
    function bind(f) {
      var args = Array.prototype.slice.call(arguments, 1);
      return function(){return f.apply(null, args);};
    }
  
    var nonASCIISingleCaseWordChar = /[\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
    function isWordChar(ch) {
      return /\w/.test(ch) || ch > "\x80" &&
        (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
    }
  
    function isEmpty(obj) {
      for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
      return true;
    }
  
    var isExtendingChar = /[\u0300-\u036F\u0483-\u0487\u0488-\u0489\u0591-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7-\u06E8\u06EA-\u06ED\uA66F\uA670-\uA672\uA674-\uA67D\uA69F\udc00-\udfff]/;
  
    // DOM UTILITIES
  
    function elt(tag, content, className, style) {
      var e = document.createElement(tag);
      if (className) e.className = className;
      if (style) e.style.cssText = style;
      if (typeof content == "string") setTextContent(e, content);
      else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
      return e;
    }
  
    function removeChildren(e) {
      for (var count = e.childNodes.length; count > 0; --count)
        e.removeChild(e.firstChild);
      return e;
    }
  
    function removeChildrenAndAdd(parent, e) {
      return removeChildren(parent).appendChild(e);
    }
  
    function setTextContent(e, str) {
      if (ie_lt9) {
        e.innerHTML = "";
        e.appendChild(document.createTextNode(str));
      } else e.textContent = str;
    }
  
    function getRect(node) {
      return node.getBoundingClientRect();
    }
    CodeMirror.replaceGetRect = function(f) { getRect = f; };
  
    // FEATURE DETECTION
  
    // Detect drag-and-drop
    var dragAndDrop = function() {
      // There is *some* kind of drag-and-drop support in IE6-8, but I
      // couldn't get it to work yet.
      if (ie_lt9) return false;
      var div = elt('div');
      return "draggable" in div || "dragDrop" in div;
    }();
  
    // For a reason I have yet to figure out, some browsers disallow
    // word wrapping between certain characters *only* if a new inline
    // element is started between them. This makes it hard to reliably
    // measure the position of things, since that requires inserting an
    // extra span. This terribly fragile set of tests matches the
    // character combinations that suffer from this phenomenon on the
    // various browsers.
    function spanAffectsWrapping() { return false; }
    if (gecko) // Only for "$'"
      spanAffectsWrapping = function(str, i) {
        return str.charCodeAt(i - 1) == 36 && str.charCodeAt(i) == 39;
      };
    else if (safari && !/Version\/([6-9]|\d\d)\b/.test(navigator.userAgent))
      spanAffectsWrapping = function(str, i) {
        return /\-[^ \-?]|\?[^ !\'\"\),.\-\/:;\?\]\}]/.test(str.slice(i - 1, i + 1));
      };
    else if (webkit && /Chrome\/(?:29|[3-9]\d|\d\d\d)\./.test(navigator.userAgent))
      spanAffectsWrapping = function(str, i) {
        var code = str.charCodeAt(i - 1);
        return code >= 8208 && code <= 8212;
      };
    else if (webkit)
      spanAffectsWrapping = function(str, i) {
        if (i > 1 && str.charCodeAt(i - 1) == 45) {
          if (/\w/.test(str.charAt(i - 2)) && /[^\-?\.]/.test(str.charAt(i))) return true;
          if (i > 2 && /[\d\.,]/.test(str.charAt(i - 2)) && /[\d\.,]/.test(str.charAt(i))) return false;
        }
        return /[~!#%&*)=+}\]\\|\"\.>,:;][({[<]|-[^\-?\.\u2010-\u201f\u2026]|\?[\w~`@#$%\^&*(_=+{[|><]|…[\w~`@#$%\^&*(_=+{[><]/.test(str.slice(i - 1, i + 1));
      };
  
    var knownScrollbarWidth;
    function scrollbarWidth(measure) {
      if (knownScrollbarWidth != null) return knownScrollbarWidth;
      var test = elt("div", null, null, "width: 50px; height: 50px; overflow-x: scroll");
      removeChildrenAndAdd(measure, test);
      if (test.offsetWidth)
        knownScrollbarWidth = test.offsetHeight - test.clientHeight;
      return knownScrollbarWidth || 0;
    }
  
    var zwspSupported;
    function zeroWidthElement(measure) {
      if (zwspSupported == null) {
        var test = elt("span", "\u200b");
        removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
        if (measure.firstChild.offsetHeight != 0)
          zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !ie_lt8;
      }
      if (zwspSupported) return elt("span", "\u200b");
      else return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
    }
  
    // See if "".split is the broken IE version, if so, provide an
    // alternative way to split lines.
    var splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
      var pos = 0, result = [], l = string.length;
      while (pos <= l) {
        var nl = string.indexOf("\n", pos);
        if (nl == -1) nl = string.length;
        var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
        var rt = line.indexOf("\r");
        if (rt != -1) {
          result.push(line.slice(0, rt));
          pos += rt + 1;
        } else {
          result.push(line);
          pos = nl + 1;
        }
      }
      return result;
    } : function(string){return string.split(/\r\n?|\n/);};
    CodeMirror.splitLines = splitLines;
  
    var hasSelection = window.getSelection ? function(te) {
      try { return te.selectionStart != te.selectionEnd; }
      catch(e) { return false; }
    } : function(te) {
      try {var range = te.ownerDocument.selection.createRange();}
      catch(e) {}
      if (!range || range.parentElement() != te) return false;
      return range.compareEndPoints("StartToEnd", range) != 0;
    };
  
    var hasCopyEvent = (function() {
      var e = elt("div");
      if ("oncopy" in e) return true;
      e.setAttribute("oncopy", "return;");
      return typeof e.oncopy == 'function';
    })();
  
    // KEY NAMING
  
    var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
                    19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
                    36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
                    46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 109: "-", 107: "=", 127: "Delete",
                    186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
                    221: "]", 222: "'", 63276: "PageUp", 63277: "PageDown", 63275: "End", 63273: "Home",
                    63234: "Left", 63232: "Up", 63235: "Right", 63233: "Down", 63302: "Insert", 63272: "Delete"};
    CodeMirror.keyNames = keyNames;
    (function() {
      // Number keys
      for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
      // Alphabetic keys
      for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
      // Function keys
      for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
    })();
  
    // BIDI HELPERS
  
    function iterateBidiSections(order, from, to, f) {
      if (!order) return f(from, to, "ltr");
      var found = false;
      for (var i = 0; i < order.length; ++i) {
        var part = order[i];
        if (part.from < to && part.to > from || from == to && part.to == from) {
          f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
          found = true;
        }
      }
      if (!found) f(from, to, "ltr");
    }
  
    function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }
    function bidiRight(part) { return part.level % 2 ? part.from : part.to; }
  
    function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }
    function lineRight(line) {
      var order = getOrder(line);
      if (!order) return line.text.length;
      return bidiRight(lst(order));
    }
  
    function lineStart(cm, lineN) {
      var line = getLine(cm.doc, lineN);
      var visual = visualLine(cm.doc, line);
      if (visual != line) lineN = lineNo(visual);
      var order = getOrder(visual);
      var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);
      return Pos(lineN, ch);
    }
    function lineEnd(cm, lineN) {
      var merged, line;
      while (merged = collapsedSpanAtEnd(line = getLine(cm.doc, lineN)))
        lineN = merged.find().to.line;
      var order = getOrder(line);
      var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
      return Pos(lineN, ch);
    }
  
    function compareBidiLevel(order, a, b) {
      var linedir = order[0].level;
      if (a == linedir) return true;
      if (b == linedir) return false;
      return a < b;
    }
    var bidiOther;
    function getBidiPartAt(order, pos) {
      for (var i = 0, found; i < order.length; ++i) {
        var cur = order[i];
        if (cur.from < pos && cur.to > pos) { bidiOther = null; return i; }
        if (cur.from == pos || cur.to == pos) {
          if (found == null) {
            found = i;
          } else if (compareBidiLevel(order, cur.level, order[found].level)) {
            bidiOther = found;
            return i;
          } else {
            bidiOther = i;
            return found;
          }
        }
      }
      bidiOther = null;
      return found;
    }
  
    function moveInLine(line, pos, dir, byUnit) {
      if (!byUnit) return pos + dir;
      do pos += dir;
      while (pos > 0 && isExtendingChar.test(line.text.charAt(pos)));
      return pos;
    }
  
    // This is somewhat involved. It is needed in order to move
    // 'visually' through bi-directional text -- i.e., pressing left
    // should make the cursor go left, even when in RTL text. The
    // tricky part is the 'jumps', where RTL and LTR text touch each
    // other. This often requires the cursor offset to move more than
    // one unit, in order to visually move one unit.
    function moveVisually(line, start, dir, byUnit) {
      var bidi = getOrder(line);
      if (!bidi) return moveLogically(line, start, dir, byUnit);
      var pos = getBidiPartAt(bidi, start), part = bidi[pos];
      var target = moveInLine(line, start, part.level % 2 ? -dir : dir, byUnit);
  
      for (;;) {
        if (target > part.from && target < part.to) return target;
        if (target == part.from || target == part.to) {
          if (getBidiPartAt(bidi, target) == pos) return target;
          part = bidi[pos += dir];
          return (dir > 0) == part.level % 2 ? part.to : part.from;
        } else {
          part = bidi[pos += dir];
          if (!part) return null;
          if ((dir > 0) == part.level % 2)
            target = moveInLine(line, part.to, -1, byUnit);
          else
            target = moveInLine(line, part.from, 1, byUnit);
        }
      }
    }
  
    function moveLogically(line, start, dir, byUnit) {
      var target = start + dir;
      if (byUnit) while (target > 0 && isExtendingChar.test(line.text.charAt(target))) target += dir;
      return target < 0 || target > line.text.length ? null : target;
    }
  
    // Bidirectional ordering algorithm
    // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
    // that this (partially) implements.
  
    // One-char codes used for character types:
    // L (L):   Left-to-Right
    // R (R):   Right-to-Left
    // r (AL):  Right-to-Left Arabic
    // 1 (EN):  European Number
    // + (ES):  European Number Separator
    // % (ET):  European Number Terminator
    // n (AN):  Arabic Number
    // , (CS):  Common Number Separator
    // m (NSM): Non-Spacing Mark
    // b (BN):  Boundary Neutral
    // s (B):   Paragraph Separator
    // t (S):   Segment Separator
    // w (WS):  Whitespace
    // N (ON):  Other Neutrals
  
    // Returns null if characters are ordered as they appear
    // (left-to-right), or an array of sections ({from, to, level}
    // objects) in the order in which they occur visually.
    var bidiOrdering = (function() {
      // Character types for codepoints 0 to 0xff
      var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLL";
      // Character types for codepoints 0x600 to 0x6ff
      var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmmrrrrrrrrrrrrrrrrrr";
      function charType(code) {
        if (code <= 0xff) return lowTypes.charAt(code);
        else if (0x590 <= code && code <= 0x5f4) return "R";
        else if (0x600 <= code && code <= 0x6ff) return arabicTypes.charAt(code - 0x600);
        else if (0x700 <= code && code <= 0x8ac) return "r";
        else return "L";
      }
  
      var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
      var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
      // Browsers seem to always treat the boundaries of block elements as being L.
      var outerType = "L";
  
      return function(str) {
        if (!bidiRE.test(str)) return false;
        var len = str.length, types = [];
        for (var i = 0, type; i < len; ++i)
          types.push(type = charType(str.charCodeAt(i)));
  
        // W1. Examine each non-spacing mark (NSM) in the level run, and
        // change the type of the NSM to the type of the previous
        // character. If the NSM is at the start of the level run, it will
        // get the type of sor.
        for (var i = 0, prev = outerType; i < len; ++i) {
          var type = types[i];
          if (type == "m") types[i] = prev;
          else prev = type;
        }
  
        // W2. Search backwards from each instance of a European number
        // until the first strong type (R, L, AL, or sor) is found. If an
        // AL is found, change the type of the European number to Arabic
        // number.
        // W3. Change all ALs to R.
        for (var i = 0, cur = outerType; i < len; ++i) {
          var type = types[i];
          if (type == "1" && cur == "r") types[i] = "n";
          else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }
        }
  
        // W4. A single European separator between two European numbers
        // changes to a European number. A single common separator between
        // two numbers of the same type changes to that type.
        for (var i = 1, prev = types[0]; i < len - 1; ++i) {
          var type = types[i];
          if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";
          else if (type == "," && prev == types[i+1] &&
                   (prev == "1" || prev == "n")) types[i] = prev;
          prev = type;
        }
  
        // W5. A sequence of European terminators adjacent to European
        // numbers changes to all European numbers.
        // W6. Otherwise, separators and terminators change to Other
        // Neutral.
        for (var i = 0; i < len; ++i) {
          var type = types[i];
          if (type == ",") types[i] = "N";
          else if (type == "%") {
            for (var end = i + 1; end < len && types[end] == "%"; ++end) {}
            var replace = (i && types[i-1] == "!") || (end < len - 1 && types[end] == "1") ? "1" : "N";
            for (var j = i; j < end; ++j) types[j] = replace;
            i = end - 1;
          }
        }
  
        // W7. Search backwards from each instance of a European number
        // until the first strong type (R, L, or sor) is found. If an L is
        // found, then change the type of the European number to L.
        for (var i = 0, cur = outerType; i < len; ++i) {
          var type = types[i];
          if (cur == "L" && type == "1") types[i] = "L";
          else if (isStrong.test(type)) cur = type;
        }
  
        // N1. A sequence of neutrals takes the direction of the
        // surrounding strong text if the text on both sides has the same
        // direction. European and Arabic numbers act as if they were R in
        // terms of their influence on neutrals. Start-of-level-run (sor)
        // and end-of-level-run (eor) are used at level run boundaries.
        // N2. Any remaining neutrals take the embedding direction.
        for (var i = 0; i < len; ++i) {
          if (isNeutral.test(types[i])) {
            for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}
            var before = (i ? types[i-1] : outerType) == "L";
            var after = (end < len - 1 ? types[end] : outerType) == "L";
            var replace = before || after ? "L" : "R";
            for (var j = i; j < end; ++j) types[j] = replace;
            i = end - 1;
          }
        }
  
        // Here we depart from the documented algorithm, in order to avoid
        // building up an actual levels array. Since there are only three
        // levels (0, 1, 2) in an implementation that doesn't take
        // explicit embedding into account, we can build up the order on
        // the fly, without following the level-based algorithm.
        var order = [], m;
        for (var i = 0; i < len;) {
          if (countsAsLeft.test(types[i])) {
            var start = i;
            for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}
            order.push({from: start, to: i, level: 0});
          } else {
            var pos = i, at = order.length;
            for (++i; i < len && types[i] != "L"; ++i) {}
            for (var j = pos; j < i;) {
              if (countsAsNum.test(types[j])) {
                if (pos < j) order.splice(at, 0, {from: pos, to: j, level: 1});
                var nstart = j;
                for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
                order.splice(at, 0, {from: nstart, to: j, level: 2});
                pos = j;
              } else ++j;
            }
            if (pos < i) order.splice(at, 0, {from: pos, to: i, level: 1});
          }
        }
        if (order[0].level == 1 && (m = str.match(/^\s+/))) {
          order[0].from = m[0].length;
          order.unshift({from: 0, to: m[0].length, level: 0});
        }
        if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
          lst(order).to -= m[0].length;
          order.push({from: len - m[0].length, to: len, level: 0});
        }
        if (order[0].level != lst(order).level)
          order.push({from: len, to: len, level: order[0].level});
  
        return order;
      };
    })();
  
    // THE END
  
    CodeMirror.version = "3.19.1";
  
    return CodeMirror;
  })();
  