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

	// This is CodeMirror (http://codemirror.net), a code editor
	// implemented in JavaScript on top of the browser's DOM.
	//
	// You can find some technical background for some of the code below
	// at http://marijnhaverbeke.nl/blog/#cm-internals .

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

	// BROWSER SNIFFING

	// Kludges for bugs and behavior differences that can't be feature
	// detected are enabled based on userAgent etc sniffing.

	var gecko = /gecko\/\d/i.test(navigator.userAgent);
	var ie_upto10 = /MSIE \d/.test(navigator.userAgent);
	var ie_11up = /Trident\/(?:[7-9]\|\d{2,})\..*rv:(\d+)/.exec(navigator.userAgent);
	var ie = ie_upto10 \|\| ie_11up;
	var ie_version = ie && (ie_upto10 ? document.documentMode \|\| 6 : ie_11up[1]);
	var webkit = /WebKit\//.test(navigator.userAgent);
	var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
	var chrome = /Chrome\//.test(navigator.userAgent);
	var presto = /Opera\//.test(navigator.userAgent);
	var safari = /Apple Computer/.test(navigator.vendor);
	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 presto_version = presto && navigator.userAgent.match(/Version\/(\d\.\d)/);
	if (presto_version) presto_version = Number(presto_version[1]);
	if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
	// Some browsers use the wrong event properties to signal cmd/ctrl on OS X
	var flipCtrlCmd = mac && (qtwebkit \|\| presto && (presto_version == null \|\| presto_version < 12.11));
	var captureRightClick = gecko \|\| (ie && ie_version >= 9);

	// Optimize some code when these features are not used.
	var sawReadOnlySpans = false, sawCollapsedSpans = false;

	// EDITOR CONSTRUCTOR

	// A CodeMirror instance represents an editor. This is the object
	// that user code is usually dealing with.

	function CodeMirror(place, options) {
	if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);

	this.options = options = options ? copyObj(options) : {};
	// Determine effective options based on given values and defaults.
	copyObj(defaults, options, false);
	setGuttersForLineNumbers(options);

	var doc = options.value;
	if (typeof doc == "string") doc = new Doc(doc, options.mode, null, options.lineSeparator);
	this.doc = doc;

	var input = new CodeMirror.inputStyles[options.inputStyle](this);
	var display = this.display = new Display(place, doc, input);
	display.wrapper.CodeMirror = this;
	updateGutters(this);
	themeChanged(this);
	if (options.lineWrapping)
	this.display.wrapper.className += " CodeMirror-wrap";
	if (options.autofocus && !mobile) display.input.focus();
	initScrollbars(this);

	this.state = {
	keyMaps: [], // stores maps added by addKeyMap
	overlays: [], // highlighting overlays, as added by addOverlay
	modeGen: 0, // bumped when mode/overlay changes, used to invalidate highlighting info
	overwrite: false,
	delayingBlurEvent: false,
	focused: false,
	suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
	pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
	selectingText: false,
	draggingText: false,
	highlight: new Delayed(), // stores highlight worker timeout
	keySeq: null, // Unfinished key sequence
	specialChars: null
	};

	var cm = this;

	// Override magic textarea content restore that IE sometimes does
	// on our hidden textarea on reload
	if (ie && ie_version < 11) setTimeout(function() { cm.display.input.reset(true); }, 20);

	registerEventHandlers(this);
	ensureGlobalHandlers();

	startOperation(this);
	this.curOp.forceUpdate = true;
	attachDoc(this, doc);

	if ((options.autofocus && !mobile) \|\| cm.hasFocus())
	setTimeout(bind(onFocus, this), 20);
	else
	onBlur(this);

	for (var opt in optionHandlers) if (optionHandlers.hasOwnProperty(opt))
	optionHandlers[opt](this, options[opt], Init);
	maybeUpdateLineNumberWidth(this);
	if (options.finishInit) options.finishInit(this);
	for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
	endOperation(this);
	// Suppress optimizelegibility in Webkit, since it breaks text
	// measuring on line wrapping boundaries.
	if (webkit && options.lineWrapping &&
	getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
	display.lineDiv.style.textRendering = "auto";
	}

	// DISPLAY CONSTRUCTOR

	// The display handles the DOM integration, both for input reading
	// and content drawing. It holds references to DOM nodes and
	// display-related state.

	function Display(place, doc, input) {
	var d = this;
	this.input = input;

	// Covers bottom-right square when both scrollbars are present.
	d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
	d.scrollbarFiller.setAttribute("cm-not-content", "true");
	// Covers bottom of gutter when coverGutterNextToScrollbar is on
	// and h scrollbar is present.
	d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
	d.gutterFiller.setAttribute("cm-not-content", "true");
	// Will contain the actual code, positioned to cover the viewport.
	d.lineDiv = elt("div", null, "CodeMirror-code");
	// Elements are added to these to represent selection and cursors.
	d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
	d.cursorDiv = elt("div", null, "CodeMirror-cursors");
	// A visibility: hidden element used to find the size of things.
	d.measure = elt("div", null, "CodeMirror-measure");
	// When lines outside of the viewport are measured, they are drawn in this.
	d.lineMeasure = elt("div", null, "CodeMirror-measure");
	// Wraps everything that needs to exist inside the vertically-padded coordinate system
	d.lineSpace = elt("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
	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 document, allowing scrolling.
	d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
	d.sizerWidth = null;
	// Behavior of elts with overflow: auto and padding is
	// inconsistent across browsers. This is used to ensure the
	// scrollable area is big enough.
	d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
	// Will contain the gutters, if any.
	d.gutters = elt("div", null, "CodeMirror-gutters");
	d.lineGutter = null;
	// Actual scrollable element.
	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.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

	// Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
	if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
	if (!webkit && !(gecko && mobile)) d.scroller.draggable = true;

	if (place) {
	if (place.appendChild) place.appendChild(d.wrapper);
	else place(d.wrapper);
	}

	// Current rendered range (may be bigger than the view window).
	d.viewFrom = d.viewTo = doc.first;
	d.reportedViewFrom = d.reportedViewTo = doc.first;
	// Information about the rendered lines.
	d.view = [];
	d.renderedView = null;
	// Holds info about a single rendered line when it was rendered
	// for measurement, while not in view.
	d.externalMeasured = null;
	// Empty space (in pixels) above the view
	d.viewOffset = 0;
	d.lastWrapHeight = d.lastWrapWidth = 0;
	d.updateLineNumbers = null;

	d.nativeBarWidth = d.barHeight = d.barWidth = 0;
	d.scrollbarsClipped = false;

	// 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;
	// Set to true when a non-horizontal-scrolling line widget is
	// added. As an optimization, line widget aligning is skipped when
	// this is false.
	d.alignWidgets = false;

	d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

	// 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;

	// True when shift is held down.
	d.shift = false;

	// Used to track whether anything happened since the context menu
	// was opened.
	d.selForContextMenu = null;

	d.activeTouch = null;

	input.init(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);
	resetModeState(cm);
	}

	function resetModeState(cm) {
	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) {
	addClass(cm.display.wrapper, "CodeMirror-wrap");
	cm.display.sizer.style.minWidth = "";
	cm.display.sizerWidth = null;
	} else {
	rmClass(cm.display.wrapper, "CodeMirror-wrap");
	findMaxLine(cm);
	}
	estimateLineHeights(cm);
	regChange(cm);
	clearCaches(cm);
	setTimeout(function(){updateScrollbars(cm);}, 100);
	}

	// Returns a function that estimates the height of a line, to use as
	// first approximation until the line becomes visible (and is thus
	// properly measurable).
	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;

	var widgetsHeight = 0;
	if (line.widgets) for (var i = 0; i < line.widgets.length; i++) {
	if (line.widgets[i].height) widgetsHeight += line.widgets[i].height;
	}

	if (wrapping)
	return widgetsHeight + (Math.ceil(line.text.length / perLine) \|\| 1) * th;
	else
	return widgetsHeight + 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 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);
	}

	// Rebuild the gutter elements, ensure the margin to the left of the
	// code matches their width.
	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";
	updateGutterSpace(cm);
	}

	function updateGutterSpace(cm) {
	var width = cm.display.gutters.offsetWidth;
	cm.display.sizer.style.marginLeft = width + "px";
	}

	// Compute the character length of a line, taking into account
	// collapsed ranges (see markText) that might hide parts, and join
	// other lines onto it.
	function lineLength(line) {
	if (line.height == 0) return 0;
	var len = line.text.length, merged, cur = line;
	while (merged = collapsedSpanAtStart(cur)) {
	var found = merged.find(0, true);
	cur = found.from.line;
	len += found.from.ch - found.to.ch;
	}
	cur = line;
	while (merged = collapsedSpanAtEnd(cur)) {
	var found = merged.find(0, true);
	len -= cur.text.length - found.from.ch;
	cur = found.to.line;
	len += cur.text.length - found.to.ch;
	}
	return len;
	}

	// Find the longest line in the document.
	function findMaxLine(cm) {
	var d = cm.display, doc = cm.doc;
	d.maxLine = getLine(doc, doc.first);
	d.maxLineLength = lineLength(d.maxLine);
	d.maxLineChanged = true;
	doc.iter(function(line) {
	var len = lineLength(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

	// Prepare DOM reads needed to update the scrollbars. Done in one
	// shot to minimize update/measure roundtrips.
	function measureForScrollbars(cm) {
	var d = cm.display, gutterW = d.gutters.offsetWidth;
	var docH = Math.round(cm.doc.height + paddingVert(cm.display));
	return {
	clientHeight: d.scroller.clientHeight,
	viewHeight: d.wrapper.clientHeight,
	scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
	viewWidth: d.wrapper.clientWidth,
	barLeft: cm.options.fixedGutter ? gutterW : 0,
	docHeight: docH,
	scrollHeight: docH + scrollGap(cm) + d.barHeight,
	nativeBarWidth: d.nativeBarWidth,
	gutterWidth: gutterW
	};
	}

	function NativeScrollbars(place, scroll, cm) {
	this.cm = cm;
	var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
	var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
	place(vert); place(horiz);

	on(vert, "scroll", function() {
	if (vert.clientHeight) scroll(vert.scrollTop, "vertical");
	});
	on(horiz, "scroll", function() {
	if (horiz.clientWidth) scroll(horiz.scrollLeft, "horizontal");
	});

	this.checkedOverlay = false;
	// Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
	if (ie && ie_version < 8) this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
	}

	NativeScrollbars.prototype = copyObj({
	update: function(measure) {
	var needsH = measure.scrollWidth > measure.clientWidth + 1;
	var needsV = measure.scrollHeight > measure.clientHeight + 1;
	var sWidth = measure.nativeBarWidth;

	if (needsV) {
	this.vert.style.display = "block";
	this.vert.style.bottom = needsH ? sWidth + "px" : "0";
	var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
	// A bug in IE8 can cause this value to be negative, so guard it.
	this.vert.firstChild.style.height =
	Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
	} else {
	this.vert.style.display = "";
	this.vert.firstChild.style.height = "0";
	}

	if (needsH) {
	this.horiz.style.display = "block";
	this.horiz.style.right = needsV ? sWidth + "px" : "0";
	this.horiz.style.left = measure.barLeft + "px";
	var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
	this.horiz.firstChild.style.width =
	(measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
	} else {
	this.horiz.style.display = "";
	this.horiz.firstChild.style.width = "0";
	}

	if (!this.checkedOverlay && measure.clientHeight > 0) {
	if (sWidth == 0) this.overlayHack();
	this.checkedOverlay = true;
	}

	return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0};
	},
	setScrollLeft: function(pos) {
	if (this.horiz.scrollLeft != pos) this.horiz.scrollLeft = pos;
	},
	setScrollTop: function(pos) {
	if (this.vert.scrollTop != pos) this.vert.scrollTop = pos;
	},
	overlayHack: function() {
	var w = mac && !mac_geMountainLion ? "12px" : "18px";
	this.horiz.style.minHeight = this.vert.style.minWidth = w;
	var self = this;
	var barMouseDown = function(e) {
	if (e_target(e) != self.vert && e_target(e) != self.horiz)
	operation(self.cm, onMouseDown)(e);
	};
	on(this.vert, "mousedown", barMouseDown);
	on(this.horiz, "mousedown", barMouseDown);
	},
	clear: function() {
	var parent = this.horiz.parentNode;
	parent.removeChild(this.horiz);
	parent.removeChild(this.vert);
	}
	}, NativeScrollbars.prototype);

	function NullScrollbars() {}

	NullScrollbars.prototype = copyObj({
	update: function() { return {bottom: 0, right: 0}; },
	setScrollLeft: function() {},
	setScrollTop: function() {},
	clear: function() {}
	}, NullScrollbars.prototype);

	CodeMirror.scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};

	function initScrollbars(cm) {
	if (cm.display.scrollbars) {
	cm.display.scrollbars.clear();
	if (cm.display.scrollbars.addClass)
	rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
	}

	cm.display.scrollbars = new CodeMirror.scrollbarModel[cm.options.scrollbarStyle](function(node) {
	cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
	// Prevent clicks in the scrollbars from killing focus
	on(node, "mousedown", function() {
	if (cm.state.focused) setTimeout(function() { cm.display.input.focus(); }, 0);
	});
	node.setAttribute("cm-not-content", "true");
	}, function(pos, axis) {
	if (axis == "horizontal") setScrollLeft(cm, pos);
	else setScrollTop(cm, pos);
	}, cm);
	if (cm.display.scrollbars.addClass)
	addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
	}

	function updateScrollbars(cm, measure) {
	if (!measure) measure = measureForScrollbars(cm);
	var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
	updateScrollbarsInner(cm, measure);
	for (var i = 0; i < 4 && startWidth != cm.display.barWidth \|\| startHeight != cm.display.barHeight; i++) {
	if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
	updateHeightsInViewport(cm);
	updateScrollbarsInner(cm, measureForScrollbars(cm));
	startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
	}
	}

	// Re-synchronize the fake scrollbars with the actual size of the
	// content.
	function updateScrollbarsInner(cm, measure) {
	var d = cm.display;
	var sizes = d.scrollbars.update(measure);

	d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
	d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";

	if (sizes.right && sizes.bottom) {
	d.scrollbarFiller.style.display = "block";
	d.scrollbarFiller.style.height = sizes.bottom + "px";
	d.scrollbarFiller.style.width = sizes.right + "px";
	} else d.scrollbarFiller.style.display = "";
	if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
	d.gutterFiller.style.display = "block";
	d.gutterFiller.style.height = sizes.bottom + "px";
	d.gutterFiller.style.width = measure.gutterWidth + "px";
	} else d.gutterFiller.style.display = "";
	}

	// Compute the lines that are visible in a given viewport (defaults
	// the the current scroll position). viewport may contain top,
	// height, and ensure (see op.scrollToPos) properties.
	function visibleLines(display, doc, viewport) {
	var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
	top = Math.floor(top - paddingTop(display));
	var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

	var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
	// Ensure is a {from: {line, ch}, to: {line, ch}} object, and
	// forces those lines into the viewport (if possible).
	if (viewport && viewport.ensure) {
	var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
	if (ensureFrom < from) {
	from = ensureFrom;
	to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
	} else if (Math.min(ensureTo, doc.lastLine()) >= to) {
	from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
	to = ensureTo;
	}
	}
	return {from: from, to: Math.max(to, from + 1)};
	}

	// LINE NUMBERS

	// Re-align line numbers and gutter marks to compensate for
	// horizontal scrolling.
	function alignHorizontally(cm) {
	var display = cm.display, view = display.view;
	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, left = comp + "px";
	for (var i = 0; i < view.length; i++) if (!view[i].hidden) {
	if (cm.options.fixedGutter && view[i].gutter)
	view[i].gutter.style.left = left;
	var align = view[i].alignable;
	if (align) for (var j = 0; j < align.length; j++)
	align[j].style.left = left;
	}
	if (cm.options.fixedGutter)
	display.gutters.style.left = (comp + gutterW) + "px";
	}

	// Used to ensure that the line number gutter is still the right
	// size for the current document size. Returns true when an update
	// is needed.
	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) + 1;
	display.lineNumWidth = display.lineNumInnerWidth + padding;
	display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
	display.lineGutter.style.width = display.lineNumWidth + "px";
	updateGutterSpace(cm);
	return true;
	}
	return false;
	}

	function lineNumberFor(options, i) {
	return String(options.lineNumberFormatter(i + options.firstLineNumber));
	}

	// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
	// but using getBoundingClientRect to get a sub-pixel-accurate
	// result.
	function compensateForHScroll(display) {
	return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left;
	}

	// DISPLAY DRAWING

	function DisplayUpdate(cm, viewport, force) {
	var display = cm.display;

	this.viewport = viewport;
	// Store some values that we'll need later (but don't want to force a relayout for)
	this.visible = visibleLines(display, cm.doc, viewport);
	this.editorIsHidden = !display.wrapper.offsetWidth;
	this.wrapperHeight = display.wrapper.clientHeight;
	this.wrapperWidth = display.wrapper.clientWidth;
	this.oldDisplayWidth = displayWidth(cm);
	this.force = force;
	this.dims = getDimensions(cm);
	this.events = [];
	}

	DisplayUpdate.prototype.signal = function(emitter, type) {
	if (hasHandler(emitter, type))
	this.events.push(arguments);
	};
	DisplayUpdate.prototype.finish = function() {
	for (var i = 0; i < this.events.length; i++)
	signal.apply(null, this.events[i]);
	};

	function maybeClipScrollbars(cm) {
	var display = cm.display;
	if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
	display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
	display.heightForcer.style.height = scrollGap(cm) + "px";
	display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
	display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
	display.scrollbarsClipped = true;
	}
	}

	// Does the actual updating of the line display. Bails out
	// (returning false) when there is nothing to be done and forced is
	// false.
	function updateDisplayIfNeeded(cm, update) {
	var display = cm.display, doc = cm.doc;

	if (update.editorIsHidden) {
	resetView(cm);
	return false;
	}

	// Bail out if the visible area is already rendered and nothing changed.
	if (!update.force &&
	update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
	(display.updateLineNumbers == null \|\| display.updateLineNumbers >= display.viewTo) &&
	display.renderedView == display.view && countDirtyView(cm) == 0)
	return false;

	if (maybeUpdateLineNumberWidth(cm)) {
	resetView(cm);
	update.dims = getDimensions(cm);
	}

	// Compute a suitable new viewport (from & to)
	var end = doc.first + doc.size;
	var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
	var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
	if (display.viewFrom < from && from - display.viewFrom < 20) from = Math.max(doc.first, display.viewFrom);
	if (display.viewTo > to && display.viewTo - to < 20) to = Math.min(end, display.viewTo);
	if (sawCollapsedSpans) {
	from = visualLineNo(cm.doc, from);
	to = visualLineEndNo(cm.doc, to);
	}

	var different = from != display.viewFrom \|\| to != display.viewTo \|\|
	display.lastWrapHeight != update.wrapperHeight \|\| display.lastWrapWidth != update.wrapperWidth;
	adjustView(cm, from, to);

	display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
	// Position the mover div to align with the current scroll position
	cm.display.mover.style.top = display.viewOffset + "px";

	var toUpdate = countDirtyView(cm);
	if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
	(display.updateLineNumbers == null \|\| display.updateLineNumbers >= display.viewTo))
	return false;

	// For big changes, we hide the enclosing element during the
	// update, since that speeds up the operations on most browsers.
	var focused = activeElt();
	if (toUpdate > 4) display.lineDiv.style.display = "none";
	patchDisplay(cm, display.updateLineNumbers, update.dims);
	if (toUpdate > 4) display.lineDiv.style.display = "";
	display.renderedView = display.view;
	// There might have been a widget with a focused element that got
	// hidden or updated, if so re-focus it.
	if (focused && activeElt() != focused && focused.offsetHeight) focused.focus();

	// Prevent selection and cursors from interfering with the scroll
	// width and height.
	removeChildren(display.cursorDiv);
	removeChildren(display.selectionDiv);
	display.gutters.style.height = display.sizer.style.minHeight = 0;

	if (different) {
	display.lastWrapHeight = update.wrapperHeight;
	display.lastWrapWidth = update.wrapperWidth;
	startWorker(cm, 400);
	}

	display.updateLineNumbers = null;

	return true;
	}

	function postUpdateDisplay(cm, update) {
	var viewport = update.viewport;
	for (var first = true;; first = false) {
	if (!first \|\| !cm.options.lineWrapping \|\| update.oldDisplayWidth == displayWidth(cm)) {
	// Clip forced viewport to actual scrollable area.
	if (viewport && viewport.top != null)
	viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)};
	// Updated line heights might result in the drawn area not
	// actually covering the viewport. Keep looping until it does.
	update.visible = visibleLines(cm.display, cm.doc, viewport);
	if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
	break;
	}
	if (!updateDisplayIfNeeded(cm, update)) break;
	updateHeightsInViewport(cm);
	var barMeasure = measureForScrollbars(cm);
	updateSelection(cm);
	setDocumentHeight(cm, barMeasure);
	updateScrollbars(cm, barMeasure);
	}

	update.signal(cm, "update", cm);
	if (cm.display.viewFrom != cm.display.reportedViewFrom \|\| cm.display.viewTo != cm.display.reportedViewTo) {
	update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
	cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
	}
	}

	function updateDisplaySimple(cm, viewport) {
	var update = new DisplayUpdate(cm, viewport);
	if (updateDisplayIfNeeded(cm, update)) {
	updateHeightsInViewport(cm);
	postUpdateDisplay(cm, update);
	var barMeasure = measureForScrollbars(cm);
	updateSelection(cm);
	setDocumentHeight(cm, barMeasure);
	updateScrollbars(cm, barMeasure);
	update.finish();
	}
	}

	function setDocumentHeight(cm, measure) {
	cm.display.sizer.style.minHeight = measure.docHeight + "px";
	var total = measure.docHeight + cm.display.barHeight;
	cm.display.heightForcer.style.top = total + "px";
	cm.display.gutters.style.height = Math.max(total + scrollGap(cm), measure.clientHeight) + "px";
	}

	// Read the actual heights of the rendered lines, and update their
	// stored heights to match.
	function updateHeightsInViewport(cm) {
	var display = cm.display;
	var prevBottom = display.lineDiv.offsetTop;
	for (var i = 0; i < display.view.length; i++) {
	var cur = display.view[i], height;
	if (cur.hidden) continue;
	if (ie && ie_version < 8) {
	var bot = cur.node.offsetTop + cur.node.offsetHeight;
	height = bot - prevBottom;
	prevBottom = bot;
	} else {
	var box = cur.node.getBoundingClientRect();
	height = box.bottom - box.top;
	}
	var diff = cur.line.height - height;
	if (height < 2) height = textHeight(display);
	if (diff > .001 \|\| diff < -.001) {
	updateLineHeight(cur.line, height);
	updateWidgetHeight(cur.line);
	if (cur.rest) for (var j = 0; j < cur.rest.length; j++)
	updateWidgetHeight(cur.rest[j]);
	}
	}
	}

	// Read and store the height of line widgets associated with the
	// given line.
	function updateWidgetHeight(line) {
	if (line.widgets) for (var i = 0; i < line.widgets.length; ++i)
	line.widgets[i].height = line.widgets[i].node.offsetHeight;
	}

	// Do a bulk-read of the DOM positions and sizes needed to draw the
	// view, so that we don't interleave reading and writing to the DOM.
	function getDimensions(cm) {
	var d = cm.display, left = {}, width = {};
	var gutterLeft = d.gutters.clientLeft;
	for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
	left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
	width[cm.options.gutters[i]] = n.clientWidth;
	}
	return {fixedPos: compensateForHScroll(d),
	gutterTotalWidth: d.gutters.offsetWidth,
	gutterLeft: left,
	gutterWidth: width,
	wrapperWidth: d.wrapper.clientWidth};
	}

	// Sync the actual display DOM structure with display.view, removing
	// nodes for lines that are no longer in view, and creating the ones
	// that are not there yet, and updating the ones that are out of
	// date.
	function patchDisplay(cm, updateNumbersFrom, dims) {
	var display = cm.display, lineNumbers = cm.options.lineNumbers;
	var container = display.lineDiv, cur = container.firstChild;

	function rm(node) {
	var next = node.nextSibling;
	// Works around a throw-scroll bug in OS X Webkit
	if (webkit && mac && cm.display.currentWheelTarget == node)
	node.style.display = "none";
	else
	node.parentNode.removeChild(node);
	return next;
	}

	var view = display.view, lineN = display.viewFrom;
	// Loop over the elements in the view, syncing cur (the DOM nodes
	// in display.lineDiv) with the view as we go.
	for (var i = 0; i < view.length; i++) {
	var lineView = view[i];
	if (lineView.hidden) {
	} else if (!lineView.node \|\| lineView.node.parentNode != container) { // Not drawn yet
	var node = buildLineElement(cm, lineView, lineN, dims);
	container.insertBefore(node, cur);
	} else { // Already drawn
	while (cur != lineView.node) cur = rm(cur);
	var updateNumber = lineNumbers && updateNumbersFrom != null &&
	updateNumbersFrom <= lineN && lineView.lineNumber;
	if (lineView.changes) {
	if (indexOf(lineView.changes, "gutter") > -1) updateNumber = false;
	updateLineForChanges(cm, lineView, lineN, dims);
	}
	if (updateNumber) {
	removeChildren(lineView.lineNumber);
	lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
	}
	cur = lineView.node.nextSibling;
	}
	lineN += lineView.size;
	}
	while (cur) cur = rm(cur);
	}

	// When an aspect of a line changes, a string is added to
	// lineView.changes. This updates the relevant part of the line's
	// DOM structure.
	function updateLineForChanges(cm, lineView, lineN, dims) {
	for (var j = 0; j < lineView.changes.length; j++) {
	var type = lineView.changes[j];
	if (type == "text") updateLineText(cm, lineView);
	else if (type == "gutter") updateLineGutter(cm, lineView, lineN, dims);
	else if (type == "class") updateLineClasses(lineView);
	else if (type == "widget") updateLineWidgets(cm, lineView, dims);
	}
	lineView.changes = null;
	}

	// Lines with gutter elements, widgets or a background class need to
	// be wrapped, and have the extra elements added to the wrapper div
	function ensureLineWrapped(lineView) {
	if (lineView.node == lineView.text) {
	lineView.node = elt("div", null, null, "position: relative");
	if (lineView.text.parentNode)
	lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
	lineView.node.appendChild(lineView.text);
	if (ie && ie_version < 8) lineView.node.style.zIndex = 2;
	}
	return lineView.node;
	}

	function updateLineBackground(lineView) {
	var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass \|\| "") : lineView.line.bgClass;
	if (cls) cls += " CodeMirror-linebackground";
	if (lineView.background) {
	if (cls) lineView.background.className = cls;
	else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
	} else if (cls) {
	var wrap = ensureLineWrapped(lineView);
	lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
	}
	}

	// Wrapper around buildLineContent which will reuse the structure
	// in display.externalMeasured when possible.
	function getLineContent(cm, lineView) {
	var ext = cm.display.externalMeasured;
	if (ext && ext.line == lineView.line) {
	cm.display.externalMeasured = null;
	lineView.measure = ext.measure;
	return ext.built;
	}
	return buildLineContent(cm, lineView);
	}

	// Redraw the line's text. Interacts with the background and text
	// classes because the mode may output tokens that influence these
	// classes.
	function updateLineText(cm, lineView) {
	var cls = lineView.text.className;
	var built = getLineContent(cm, lineView);
	if (lineView.text == lineView.node) lineView.node = built.pre;
	lineView.text.parentNode.replaceChild(built.pre, lineView.text);
	lineView.text = built.pre;
	if (built.bgClass != lineView.bgClass \|\| built.textClass != lineView.textClass) {
	lineView.bgClass = built.bgClass;
	lineView.textClass = built.textClass;
	updateLineClasses(lineView);
	} else if (cls) {
	lineView.text.className = cls;
	}
	}

	function updateLineClasses(lineView) {
	updateLineBackground(lineView);
	if (lineView.line.wrapClass)
	ensureLineWrapped(lineView).className = lineView.line.wrapClass;
	else if (lineView.node != lineView.text)
	lineView.node.className = "";
	var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass \|\| "") : lineView.line.textClass;
	lineView.text.className = textClass \|\| "";
	}

	function updateLineGutter(cm, lineView, lineN, dims) {
	if (lineView.gutter) {
	lineView.node.removeChild(lineView.gutter);
	lineView.gutter = null;
	}
	if (lineView.gutterBackground) {
	lineView.node.removeChild(lineView.gutterBackground);
	lineView.gutterBackground = null;
	}
	if (lineView.line.gutterClass) {
	var wrap = ensureLineWrapped(lineView);
	lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
	"left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
	"px; width: " + dims.gutterTotalWidth + "px");
	wrap.insertBefore(lineView.gutterBackground, lineView.text);
	}
	var markers = lineView.line.gutterMarkers;
	if (cm.options.lineNumbers \|\| markers) {
	var wrap = ensureLineWrapped(lineView);
	var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", "left: " +
	(cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px");
	cm.display.input.setUneditable(gutterWrap);
	wrap.insertBefore(gutterWrap, lineView.text);
	if (lineView.line.gutterClass)
	gutterWrap.className += " " + lineView.line.gutterClass;
	if (cm.options.lineNumbers && (!markers \|\| !markers["CodeMirror-linenumbers"]))
	lineView.lineNumber = gutterWrap.appendChild(
	elt("div", lineNumberFor(cm.options, lineN),
	"CodeMirror-linenumber CodeMirror-gutter-elt",
	"left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
	+ cm.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"));
	}
	}
	}

	function updateLineWidgets(cm, lineView, dims) {
	if (lineView.alignable) lineView.alignable = null;
	for (var node = lineView.node.firstChild, next; node; node = next) {
	var next = node.nextSibling;
	if (node.className == "CodeMirror-linewidget")
	lineView.node.removeChild(node);
	}
	insertLineWidgets(cm, lineView, dims);
	}

	// Build a line's DOM representation from scratch
	function buildLineElement(cm, lineView, lineN, dims) {
	var built = getLineContent(cm, lineView);
	lineView.text = lineView.node = built.pre;
	if (built.bgClass) lineView.bgClass = built.bgClass;
	if (built.textClass) lineView.textClass = built.textClass;

	updateLineClasses(lineView);
	updateLineGutter(cm, lineView, lineN, dims);
	insertLineWidgets(cm, lineView, dims);
	return lineView.node;
	}

	// A lineView may contain multiple logical lines (when merged by
	// collapsed spans). The widgets for all of them need to be drawn.
	function insertLineWidgets(cm, lineView, dims) {
	insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
	if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
	insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
	}

	function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
	if (!line.widgets) return;
	var wrap = ensureLineWrapped(lineView);
	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.setAttribute("cm-ignore-events", "true");
	positionLineWidget(widget, node, lineView, dims);
	cm.display.input.setUneditable(node);
	if (allowAbove && widget.above)
	wrap.insertBefore(node, lineView.gutter \|\| lineView.text);
	else
	wrap.appendChild(node);
	signalLater(widget, "redraw");
	}
	}

	function positionLineWidget(widget, node, lineView, dims) {
	if (widget.noHScroll) {
	(lineView.alignable \|\| (lineView.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";
	}
	}

	// POSITION OBJECT

	// A Pos instance represents a position within the text.
	var Pos = CodeMirror.Pos = function(line, ch) {
	if (!(this instanceof Pos)) return new Pos(line, ch);
	this.line = line; this.ch = ch;
	};

	// Compare two positions, return 0 if they are the same, a negative
	// number when a is less, and a positive number otherwise.
	var cmp = CodeMirror.cmpPos = function(a, b) { return a.line - b.line \|\| a.ch - b.ch; };

	function copyPos(x) {return Pos(x.line, x.ch);}
	function maxPos(a, b) { return cmp(a, b) < 0 ? b : a; }
	function minPos(a, b) { return cmp(a, b) < 0 ? a : b; }

	// INPUT HANDLING

	function ensureFocus(cm) {
	if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }
	}

	function isReadOnly(cm) {
	return cm.options.readOnly \|\| cm.doc.cantEdit;
	}

	// This will be set to an array of strings when copying, so that,
	// when pasting, we know what kind of selections the copied text
	// was made out of.
	var lastCopied = null;

	function applyTextInput(cm, inserted, deleted, sel, origin) {
	var doc = cm.doc;
	cm.display.shift = false;
	if (!sel) sel = doc.sel;

	var paste = cm.state.pasteIncoming \|\| origin == "paste";
	var textLines = doc.splitLines(inserted), multiPaste = null;
	// When pasing N lines into N selections, insert one line per selection
	if (paste && sel.ranges.length > 1) {
	if (lastCopied && lastCopied.join("\n") == inserted) {
	if (sel.ranges.length % lastCopied.length == 0) {
	multiPaste = [];
	for (var i = 0; i < lastCopied.length; i++)
	multiPaste.push(doc.splitLines(lastCopied[i]));
	}
	} else if (textLines.length == sel.ranges.length) {
	multiPaste = map(textLines, function(l) { return [l]; });
	}
	}

	// Normal behavior is to insert the new text into every selection
	for (var i = sel.ranges.length - 1; i >= 0; i--) {
	var range = sel.ranges[i];
	var from = range.from(), to = range.to();
	if (range.empty()) {
	if (deleted && deleted > 0) // Handle deletion
	from = Pos(from.line, from.ch - deleted);
	else if (cm.state.overwrite && !paste) // Handle overwrite
	to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
	}
	var updateInput = cm.curOp.updateInput;
	var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i % multiPaste.length] : textLines,
	origin: origin \|\| (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")};
	makeChange(cm.doc, changeEvent);
	signalLater(cm, "inputRead", cm, changeEvent);
	}
	if (inserted && !paste)
	triggerElectric(cm, inserted);

	ensureCursorVisible(cm);
	cm.curOp.updateInput = updateInput;
	cm.curOp.typing = true;
	cm.state.pasteIncoming = cm.state.cutIncoming = false;
	}

	function handlePaste(e, cm) {
	var pasted = e.clipboardData && e.clipboardData.getData("text/plain");
	if (pasted) {
	e.preventDefault();
	if (!isReadOnly(cm) && !cm.options.disableInput)
	runInOp(cm, function() { applyTextInput(cm, pasted, 0, null, "paste"); });
	return true;
	}
	}

	function triggerElectric(cm, inserted) {
	// When an 'electric' character is inserted, immediately trigger a reindent
	if (!cm.options.electricChars \|\| !cm.options.smartIndent) return;
	var sel = cm.doc.sel;

	for (var i = sel.ranges.length - 1; i >= 0; i--) {
	var range = sel.ranges[i];
	if (range.head.ch > 100 \|\| (i && sel.ranges[i - 1].head.line == range.head.line)) continue;
	var mode = cm.getModeAt(range.head);
	var indented = false;
	if (mode.electricChars) {
	for (var j = 0; j < mode.electricChars.length; j++)
	if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
	indented = indentLine(cm, range.head.line, "smart");
	break;
	}
	} else if (mode.electricInput) {
	if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
	indented = indentLine(cm, range.head.line, "smart");
	}
	if (indented) signalLater(cm, "electricInput", cm, range.head.line);
	}
	}

	function copyableRanges(cm) {
	var text = [], ranges = [];
	for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
	var line = cm.doc.sel.ranges[i].head.line;
	var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
	ranges.push(lineRange);
	text.push(cm.getRange(lineRange.anchor, lineRange.head));
	}
	return {text: text, ranges: ranges};
	}

	function disableBrowserMagic(field) {
	field.setAttribute("autocorrect", "off");
	field.setAttribute("autocapitalize", "off");
	field.setAttribute("spellcheck", "false");
	}

	// TEXTAREA INPUT STYLE

	function TextareaInput(cm) {
	this.cm = cm;
	// See input.poll and input.reset
	this.prevInput = "";

	// Flag that indicates whether we expect input to appear real soon
	// now (after some event like 'keypress' or 'input') and are
	// polling intensively.
	this.pollingFast = false;
	// Self-resetting timeout for the poller
	this.polling = new Delayed();
	// Tracks when input.reset has punted to just putting a short
	// string into the textarea instead of the full selection.
	this.inaccurateSelection = false;
	// Used to work around IE issue with selection being forgotten when focus moves away from textarea
	this.hasSelection = false;
	this.composing = null;
	};

	function hiddenTextarea() {
	var te = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none");
	var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
	// The textarea is kept positioned near the cursor to prevent the
	// fact that it'll be scrolled into view on input from scrolling
	// our fake cursor out of view. On webkit, when wrap=off, paste is
	// very slow. So make the area wide instead.
	if (webkit) te.style.width = "1000px";
	else te.setAttribute("wrap", "off");
	// If border: 0; -- iOS fails to open keyboard (issue #1287)
	if (ios) te.style.border = "1px solid black";
	disableBrowserMagic(te);
	return div;
	}

	TextareaInput.prototype = copyObj({
	init: function(display) {
	var input = this, cm = this.cm;

	// Wraps and hides input textarea
	var div = this.wrapper = hiddenTextarea();
	// The semihidden textarea that is focused when the editor is
	// focused, and receives input.
	var te = this.textarea = div.firstChild;
	display.wrapper.insertBefore(div, display.wrapper.firstChild);

	// Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
	if (ios) te.style.width = "0px";

	on(te, "input", function() {
	if (ie && ie_version >= 9 && input.hasSelection) input.hasSelection = null;
	input.poll();
	});

	on(te, "paste", function(e) {
	if (handlePaste(e, cm)) return true;

	cm.state.pasteIncoming = true;
	input.fastPoll();
	});

	function prepareCopyCut(e) {
	if (cm.somethingSelected()) {
	lastCopied = cm.getSelections();
	if (input.inaccurateSelection) {
	input.prevInput = "";
	input.inaccurateSelection = false;
	te.value = lastCopied.join("\n");
	selectInput(te);
	}
	} else if (!cm.options.lineWiseCopyCut) {
	return;
	} else {
	var ranges = copyableRanges(cm);
	lastCopied = ranges.text;
	if (e.type == "cut") {
	cm.setSelections(ranges.ranges, null, sel_dontScroll);
	} else {
	input.prevInput = "";
	te.value = ranges.text.join("\n");
	selectInput(te);
	}
	}
	if (e.type == "cut") cm.state.cutIncoming = true;
	}
	on(te, "cut", prepareCopyCut);
	on(te, "copy", prepareCopyCut);

	on(display.scroller, "paste", function(e) {
	if (eventInWidget(display, e)) return;
	cm.state.pasteIncoming = true;
	input.focus();
	});

	// Prevent normal selection in the editor (we handle our own)
	on(display.lineSpace, "selectstart", function(e) {
	if (!eventInWidget(display, e)) e_preventDefault(e);
	});

	on(te, "compositionstart", function() {
	var start = cm.getCursor("from");
	input.composing = {
	start: start,
	range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
	};
	});
	on(te, "compositionend", function() {
	if (input.composing) {
	input.poll();
	input.composing.range.clear();
	input.composing = null;
	}
	});
	},

	prepareSelection: function() {
	// Redraw the selection and/or cursor
	var cm = this.cm, display = cm.display, doc = cm.doc;
	var result = prepareSelection(cm);

	// Move the hidden textarea near the cursor to prevent scrolling artifacts
	if (cm.options.moveInputWithCursor) {
	var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
	var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
	result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
	headPos.top + lineOff.top - wrapOff.top));
	result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
	headPos.left + lineOff.left - wrapOff.left));
	}

	return result;
	},

	showSelection: function(drawn) {
	var cm = this.cm, display = cm.display;
	removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
	removeChildrenAndAdd(display.selectionDiv, drawn.selection);
	if (drawn.teTop != null) {
	this.wrapper.style.top = drawn.teTop + "px";
	this.wrapper.style.left = drawn.teLeft + "px";
	}
	},

	// Reset the input to correspond to the selection (or to be empty,
	// when not typing and nothing is selected)
	reset: function(typing) {
	if (this.contextMenuPending) return;
	var minimal, selected, cm = this.cm, doc = cm.doc;
	if (cm.somethingSelected()) {
	this.prevInput = "";
	var range = doc.sel.primary();
	minimal = hasCopyEvent &&
	(range.to().line - range.from().line > 100 \|\| (selected = cm.getSelection()).length > 1000);
	var content = minimal ? "-" : selected \|\| cm.getSelection();
	this.textarea.value = content;
	if (cm.state.focused) selectInput(this.textarea);
	if (ie && ie_version >= 9) this.hasSelection = content;
	} else if (!typing) {
	this.prevInput = this.textarea.value = "";
	if (ie && ie_version >= 9) this.hasSelection = null;
	}
	this.inaccurateSelection = minimal;
	},

	getField: function() { return this.textarea; },

	supportsTouch: function() { return false; },

	focus: function() {
	if (this.cm.options.readOnly != "nocursor" && (!mobile \|\| activeElt() != this.textarea)) {
	try { this.textarea.focus(); }
	catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
	}
	},

	blur: function() { this.textarea.blur(); },

	resetPosition: function() {
	this.wrapper.style.top = this.wrapper.style.left = 0;
	},

	receivedFocus: function() { this.slowPoll(); },

	// Poll for input changes, using the normal rate of polling. This
	// runs as long as the editor is focused.
	slowPoll: function() {
	var input = this;
	if (input.pollingFast) return;
	input.polling.set(this.cm.options.pollInterval, function() {
	input.poll();
	if (input.cm.state.focused) input.slowPoll();
	});
	},

	// When an event has just come in that is likely to add or change
	// something in the input textarea, we poll faster, to ensure that
	// the change appears on the screen quickly.
	fastPoll: function() {
	var missed = false, input = this;
	input.pollingFast = true;
	function p() {
	var changed = input.poll();
	if (!changed && !missed) {missed = true; input.polling.set(60, p);}
	else {input.pollingFast = false; input.slowPoll();}
	}
	input.polling.set(20, p);
	},

	// Read input from the textarea, and update the document to match.
	// When something is selected, it is present in the textarea, and
	// selected (unless it is huge, in which case a placeholder is
	// used). When nothing is selected, the cursor sits after previously
	// seen text (can be empty), which is stored in prevInput (we must
	// not reset the textarea when typing, because that breaks IME).
	poll: function() {
	var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
	// Since this is called a lot, try to bail out as cheaply as
	// possible when it is clear that nothing happened. hasSelection
	// will be the case when there is a lot of text in the textarea,
	// in which case reading its value would be expensive.
	if (this.contextMenuPending \|\| !cm.state.focused \|\|
	(hasSelection(input) && !prevInput && !this.composing) \|\|
	isReadOnly(cm) \|\| cm.options.disableInput \|\| cm.state.keySeq)
	return false;

	var text = input.value;
	// If nothing changed, bail.
	if (text == prevInput && !cm.somethingSelected()) return false;
	// Work around nonsensical selection resetting in IE9/10, and
	// inexplicable appearance of private area unicode characters on
	// some key combos in Mac (#2689).
	if (ie && ie_version >= 9 && this.hasSelection === text \|\|
	mac && /[\uf700-\uf7ff]/.test(text)) {
	cm.display.input.reset();
	return false;
	}

	if (cm.doc.sel == cm.display.selForContextMenu) {
	var first = text.charCodeAt(0);
	if (first == 0x200b && !prevInput) prevInput = "\u200b";
	if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo"); }
	}
	// Find the part of the input that is actually new
	var same = 0, l = Math.min(prevInput.length, text.length);
	while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;

	var self = this;
	runInOp(cm, function() {
	applyTextInput(cm, text.slice(same), prevInput.length - same,
	null, self.composing ? "*compose" : null);

	// Don't leave long text in the textarea, since it makes further polling slow
	if (text.length > 1000 \|\| text.indexOf("\n") > -1) input.value = self.prevInput = "";
	else self.prevInput = text;

	if (self.composing) {
	self.composing.range.clear();
	self.composing.range = cm.markText(self.composing.start, cm.getCursor("to"),
	{className: "CodeMirror-composing"});
	}
	});
	return true;
	},

	ensurePolled: function() {
	if (this.pollingFast && this.poll()) this.pollingFast = false;
	},

	onKeyPress: function() {
	if (ie && ie_version >= 9) this.hasSelection = null;
	this.fastPoll();
	},

	onContextMenu: function(e) {
	var input = this, cm = input.cm, display = cm.display, te = input.textarea;
	var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
	if (!pos \|\| presto) 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 && cm.doc.sel.contains(pos) == -1)
	operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);

	var oldCSS = te.style.cssText;
	input.wrapper.style.position = "absolute";
	te.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
	"px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: " +
	(ie ? "rgba(255, 255, 255, .05)" : "transparent") +
	"; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
	if (webkit) var oldScrollY = window.scrollY; // Work around Chrome issue (#2712)
	display.input.focus();
	if (webkit) window.scrollTo(null, oldScrollY);
	display.input.reset();
	// Adds "Select all" to context menu in FF
	if (!cm.somethingSelected()) te.value = input.prevInput = " ";
	input.contextMenuPending = true;
	display.selForContextMenu = cm.doc.sel;
	clearTimeout(display.detectingSelectAll);

	// Select-all will be greyed out if there's nothing to select, so
	// this adds a zero-width space so that we can later check whether
	// it got selected.
	function prepareSelectAllHack() {
	if (te.selectionStart != null) {
	var selected = cm.somethingSelected();
	var extval = "\u200b" + (selected ? te.value : "");
	te.value = "\u21da"; // Used to catch context-menu undo
	te.value = extval;
	input.prevInput = selected ? "" : "\u200b";
	te.selectionStart = 1; te.selectionEnd = extval.length;
	// Re-set this, in case some other handler touched the
	// selection in the meantime.
	display.selForContextMenu = cm.doc.sel;
	}
	}
	function rehide() {
	input.contextMenuPending = false;
	input.wrapper.style.position = "relative";
	te.style.cssText = oldCSS;
	if (ie && ie_version < 9) display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);

	// Try to detect the user choosing select-all
	if (te.selectionStart != null) {
	if (!ie \|\| (ie && ie_version < 9)) prepareSelectAllHack();
	var i = 0, poll = function() {
	if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
	te.selectionEnd > 0 && input.prevInput == "\u200b")
	operation(cm, commands.selectAll)(cm);
	else if (i++ < 10) display.detectingSelectAll = setTimeout(poll, 500);
	else display.input.reset();
	};
	display.detectingSelectAll = setTimeout(poll, 200);
	}
	}

	if (ie && ie_version >= 9) prepareSelectAllHack();
	if (captureRightClick) {
	e_stop(e);
	var mouseup = function() {
	off(window, "mouseup", mouseup);
	setTimeout(rehide, 20);
	};
	on(window, "mouseup", mouseup);
	} else {
	setTimeout(rehide, 50);
	}
	},

	setUneditable: nothing,

	needsContentAttribute: false
	}, TextareaInput.prototype);

	// CONTENTEDITABLE INPUT STYLE

	function ContentEditableInput(cm) {
	this.cm = cm;
	this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
	this.polling = new Delayed();
	this.gracePeriod = false;
	}

	ContentEditableInput.prototype = copyObj({
	init: function(display) {
	var input = this, cm = input.cm;
	var div = input.div = display.lineDiv;
	div.contentEditable = "true";
	disableBrowserMagic(div);

	on(div, "paste", function(e) { handlePaste(e, cm); })

	on(div, "compositionstart", function(e) {
	var data = e.data;
	input.composing = {sel: cm.doc.sel, data: data, startData: data};
	if (!data) return;
	var prim = cm.doc.sel.primary();
	var line = cm.getLine(prim.head.line);
	var found = line.indexOf(data, Math.max(0, prim.head.ch - data.length));
	if (found > -1 && found <= prim.head.ch)
	input.composing.sel = simpleSelection(Pos(prim.head.line, found),
	Pos(prim.head.line, found + data.length));
	});
	on(div, "compositionupdate", function(e) {
	input.composing.data = e.data;
	});
	on(div, "compositionend", function(e) {
	var ours = input.composing;
	if (!ours) return;
	if (e.data != ours.startData && !/\u200b/.test(e.data))
	ours.data = e.data;
	// Need a small delay to prevent other code (input event,
	// selection polling) from doing damage when fired right after
	// compositionend.
	setTimeout(function() {
	if (!ours.handled)
	input.applyComposition(ours);
	if (input.composing == ours)
	input.composing = null;
	}, 50);
	});

	on(div, "touchstart", function() {
	input.forceCompositionEnd();
	});

	on(div, "input", function() {
	if (input.composing) return;
	if (!input.pollContent())
	runInOp(input.cm, function() {regChange(cm);});
	});

	function onCopyCut(e) {
	if (cm.somethingSelected()) {
	lastCopied = cm.getSelections();
	if (e.type == "cut") cm.replaceSelection("", null, "cut");
	} else if (!cm.options.lineWiseCopyCut) {
	return;
	} else {
	var ranges = copyableRanges(cm);
	lastCopied = ranges.text;
	if (e.type == "cut") {
	cm.operation(function() {
	cm.setSelections(ranges.ranges, 0, sel_dontScroll);
	cm.replaceSelection("", null, "cut");
	});
	}
	}
	// iOS exposes the clipboard API, but seems to discard content inserted into it
	if (e.clipboardData && !ios) {
	e.preventDefault();
	e.clipboardData.clearData();
	e.clipboardData.setData("text/plain", lastCopied.join("\n"));
	} else {
	// Old-fashioned briefly-focus-a-textarea hack
	var kludge = hiddenTextarea(), te = kludge.firstChild;
	cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
	te.value = lastCopied.join("\n");
	var hadFocus = document.activeElement;
	selectInput(te);
	setTimeout(function() {
	cm.display.lineSpace.removeChild(kludge);
	hadFocus.focus();
	}, 50);
	}
	}
	on(div, "copy", onCopyCut);
	on(div, "cut", onCopyCut);
	},

	prepareSelection: function() {
	var result = prepareSelection(this.cm, false);
	result.focus = this.cm.state.focused;
	return result;
	},

	showSelection: function(info) {
	if (!info \|\| !this.cm.display.view.length) return;
	if (info.focus) this.showPrimarySelection();
	this.showMultipleSelections(info);
	},

	showPrimarySelection: function() {
	var sel = window.getSelection(), prim = this.cm.doc.sel.primary();
	var curAnchor = domToPos(this.cm, sel.anchorNode, sel.anchorOffset);
	var curFocus = domToPos(this.cm, sel.focusNode, sel.focusOffset);
	if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
	cmp(minPos(curAnchor, curFocus), prim.from()) == 0 &&
	cmp(maxPos(curAnchor, curFocus), prim.to()) == 0)
	return;

	var start = posToDOM(this.cm, prim.from());
	var end = posToDOM(this.cm, prim.to());
	if (!start && !end) return;

	var view = this.cm.display.view;
	var old = sel.rangeCount && sel.getRangeAt(0);
	if (!start) {
	start = {node: view[0].measure.map[2], offset: 0};
	} else if (!end) { // FIXME dangerously hacky
	var measure = view[view.length - 1].measure;
	var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
	end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
	}

	try { var rng = range(start.node, start.offset, end.offset, end.node); }
	catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
	if (rng) {
	sel.removeAllRanges();
	sel.addRange(rng);
	if (old && sel.anchorNode == null) sel.addRange(old);
	else if (gecko) this.startGracePeriod();
	}
	this.rememberSelection();
	},

	startGracePeriod: function() {
	var input = this;
	clearTimeout(this.gracePeriod);
	this.gracePeriod = setTimeout(function() {
	input.gracePeriod = false;
	if (input.selectionChanged())
	input.cm.operation(function() { input.cm.curOp.selectionChanged = true; });
	}, 20);
	},

	showMultipleSelections: function(info) {
	removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
	removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
	},

	rememberSelection: function() {
	var sel = window.getSelection();
	this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
	this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
	},

	selectionInEditor: function() {
	var sel = window.getSelection();
	if (!sel.rangeCount) return false;
	var node = sel.getRangeAt(0).commonAncestorContainer;
	return contains(this.div, node);
	},

	focus: function() {
	if (this.cm.options.readOnly != "nocursor") this.div.focus();
	},
	blur: function() { this.div.blur(); },
	getField: function() { return this.div; },

	supportsTouch: function() { return true; },

	receivedFocus: function() {
	var input = this;
	if (this.selectionInEditor())
	this.pollSelection();
	else
	runInOp(this.cm, function() { input.cm.curOp.selectionChanged = true; });

	function poll() {
	if (input.cm.state.focused) {
	input.pollSelection();
	input.polling.set(input.cm.options.pollInterval, poll);
	}
	}
	this.polling.set(this.cm.options.pollInterval, poll);
	},

	selectionChanged: function() {
	var sel = window.getSelection();
	return sel.anchorNode != this.lastAnchorNode \|\| sel.anchorOffset != this.lastAnchorOffset \|\|
	sel.focusNode != this.lastFocusNode \|\| sel.focusOffset != this.lastFocusOffset;
	},

	pollSelection: function() {
	if (!this.composing && !this.gracePeriod && this.selectionChanged()) {
	var sel = window.getSelection(), cm = this.cm;
	this.rememberSelection();
	var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
	var head = domToPos(cm, sel.focusNode, sel.focusOffset);
	if (anchor && head) runInOp(cm, function() {
	setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
	if (anchor.bad \|\| head.bad) cm.curOp.selectionChanged = true;
	});
	}
	},

	pollContent: function() {
	var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
	var from = sel.from(), to = sel.to();
	if (from.line < display.viewFrom \|\| to.line > display.viewTo - 1) return false;

	var fromIndex;
	if (from.line == display.viewFrom \|\| (fromIndex = findViewIndex(cm, from.line)) == 0) {
	var fromLine = lineNo(display.view[0].line);
	var fromNode = display.view[0].node;
	} else {
	var fromLine = lineNo(display.view[fromIndex].line);
	var fromNode = display.view[fromIndex - 1].node.nextSibling;
	}
	var toIndex = findViewIndex(cm, to.line);
	if (toIndex == display.view.length - 1) {
	var toLine = display.viewTo - 1;
	var toNode = display.lineDiv.lastChild;
	} else {
	var toLine = lineNo(display.view[toIndex + 1].line) - 1;
	var toNode = display.view[toIndex + 1].node.previousSibling;
	}

	var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
	var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
	while (newText.length > 1 && oldText.length > 1) {
	if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
	else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
	else break;
	}

	var cutFront = 0, cutEnd = 0;
	var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
	while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
	++cutFront;
	var newBot = lst(newText), oldBot = lst(oldText);
	var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
	oldBot.length - (oldText.length == 1 ? cutFront : 0));
	while (cutEnd < maxCutEnd &&
	newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
	++cutEnd;

	newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd);
	newText[0] = newText[0].slice(cutFront);

	var chFrom = Pos(fromLine, cutFront);
	var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
	if (newText.length > 1 \|\| newText[0] \|\| cmp(chFrom, chTo)) {
	replaceRange(cm.doc, newText, chFrom, chTo, "+input");
	return true;
	}
	},

	ensurePolled: function() {
	this.forceCompositionEnd();
	},
	reset: function() {
	this.forceCompositionEnd();
	},
	forceCompositionEnd: function() {
	if (!this.composing \|\| this.composing.handled) return;
	this.applyComposition(this.composing);
	this.composing.handled = true;
	this.div.blur();
	this.div.focus();
	},
	applyComposition: function(composing) {
	if (composing.data && composing.data != composing.startData)
	operation(this.cm, applyTextInput)(this.cm, composing.data, 0, composing.sel);
	},

	setUneditable: function(node) {
	node.setAttribute("contenteditable", "false");
	},

	onKeyPress: function(e) {
	e.preventDefault();
	operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
	},

	onContextMenu: nothing,
	resetPosition: nothing,

	needsContentAttribute: true
	}, ContentEditableInput.prototype);

	function posToDOM(cm, pos) {
	var view = findViewForLine(cm, pos.line);
	if (!view \|\| view.hidden) return null;
	var line = getLine(cm.doc, pos.line);
	var info = mapFromLineView(view, line, pos.line);

	var order = getOrder(line), side = "left";
	if (order) {
	var partPos = getBidiPartAt(order, pos.ch);
	side = partPos % 2 ? "right" : "left";
	}
	var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
	result.offset = result.collapse == "right" ? result.end : result.start;
	return result;
	}

	function badPos(pos, bad) { if (bad) pos.bad = true; return pos; }

	function domToPos(cm, node, offset) {
	var lineNode;
	if (node == cm.display.lineDiv) {
	lineNode = cm.display.lineDiv.childNodes[offset];
	if (!lineNode) return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true);
	node = null; offset = 0;
	} else {
	for (lineNode = node;; lineNode = lineNode.parentNode) {
	if (!lineNode \|\| lineNode == cm.display.lineDiv) return null;
	if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) break;
	}
	}
	for (var i = 0; i < cm.display.view.length; i++) {
	var lineView = cm.display.view[i];
	if (lineView.node == lineNode)
	return locateNodeInLineView(lineView, node, offset);
	}
	}

	function locateNodeInLineView(lineView, node, offset) {
	var wrapper = lineView.text.firstChild, bad = false;
	if (!node \|\| !contains(wrapper, node)) return badPos(Pos(lineNo(lineView.line), 0), true);
	if (node == wrapper) {
	bad = true;
	node = wrapper.childNodes[offset];
	offset = 0;
	if (!node) {
	var line = lineView.rest ? lst(lineView.rest) : lineView.line;
	return badPos(Pos(lineNo(line), line.text.length), bad);
	}
	}

	var textNode = node.nodeType == 3 ? node : null, topNode = node;
	if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
	textNode = node.firstChild;
	if (offset) offset = textNode.nodeValue.length;
	}
	while (topNode.parentNode != wrapper) topNode = topNode.parentNode;
	var measure = lineView.measure, maps = measure.maps;

	function find(textNode, topNode, offset) {
	for (var i = -1; i < (maps ? maps.length : 0); i++) {
	var map = i < 0 ? measure.map : maps[i];
	for (var j = 0; j < map.length; j += 3) {
	var curNode = map[j + 2];
	if (curNode == textNode \|\| curNode == topNode) {
	var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
	var ch = map[j] + offset;
	if (offset < 0 \|\| curNode != textNode) ch = map[j + (offset ? 1 : 0)];
	return Pos(line, ch);
	}
	}
	}
	}
	var found = find(textNode, topNode, offset);
	if (found) return badPos(found, bad);

	// FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
	for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
	found = find(after, after.firstChild, 0);
	if (found)
	return badPos(Pos(found.line, found.ch - dist), bad);
	else
	dist += after.textContent.length;
	}
	for (var before = topNode.previousSibling, dist = offset; before; before = before.previousSibling) {
	found = find(before, before.firstChild, -1);
	if (found)
	return badPos(Pos(found.line, found.ch + dist), bad);
	else
	dist += after.textContent.length;
	}
	}

	function domTextBetween(cm, from, to, fromLine, toLine) {
	var text = "", closing = false, lineSep = cm.doc.lineSeparator();
	function recognizeMarker(id) { return function(marker) { return marker.id == id; }; }
	function walk(node) {
	if (node.nodeType == 1) {
	var cmText = node.getAttribute("cm-text");
	if (cmText != null) {
	if (cmText == "") cmText = node.textContent.replace(/\u200b/g, "");
	text += cmText;
	return;
	}
	var markerID = node.getAttribute("cm-marker"), range;
	if (markerID) {
	var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
	if (found.length && (range = found[0].find()))
	text += getBetween(cm.doc, range.from, range.to).join(lineSep);
	return;
	}
	if (node.getAttribute("contenteditable") == "false") return;
	for (var i = 0; i < node.childNodes.length; i++)
	walk(node.childNodes[i]);
	if (/^(pre\|div\|p)$/i.test(node.nodeName))
	closing = true;
	} else if (node.nodeType == 3) {
	var val = node.nodeValue;
	if (!val) return;
	if (closing) {
	text += lineSep;
	closing = false;
	}
	text += val;
	}
	}
	for (;;) {
	walk(from);
	if (from == to) break;
	from = from.nextSibling;
	}
	return text;
	}

	CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};

	// SELECTION / CURSOR

	// Selection objects are immutable. A new one is created every time
	// the selection changes. A selection is one or more non-overlapping
	// (and non-touching) ranges, sorted, and an integer that indicates
	// which one is the primary selection (the one that's scrolled into
	// view, that getCursor returns, etc).
	function Selection(ranges, primIndex) {
	this.ranges = ranges;
	this.primIndex = primIndex;
	}

	Selection.prototype = {
	primary: function() { return this.ranges[this.primIndex]; },
	equals: function(other) {
	if (other == this) return true;
	if (other.primIndex != this.primIndex \|\| other.ranges.length != this.ranges.length) return false;
	for (var i = 0; i < this.ranges.length; i++) {
	var here = this.ranges[i], there = other.ranges[i];
	if (cmp(here.anchor, there.anchor) != 0 \|\| cmp(here.head, there.head) != 0) return false;
	}
	return true;
	},
	deepCopy: function() {
	for (var out = [], i = 0; i < this.ranges.length; i++)
	out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head));
	return new Selection(out, this.primIndex);
	},
	somethingSelected: function() {
	for (var i = 0; i < this.ranges.length; i++)
	if (!this.ranges[i].empty()) return true;
	return false;
	},
	contains: function(pos, end) {
	if (!end) end = pos;
	for (var i = 0; i < this.ranges.length; i++) {
	var range = this.ranges[i];
	if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
	return i;
	}
	return -1;
	}
	};

	function Range(anchor, head) {
	this.anchor = anchor; this.head = head;
	}

	Range.prototype = {
	from: function() { return minPos(this.anchor, this.head); },
	to: function() { return maxPos(this.anchor, this.head); },
	empty: function() {
	return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch;
	}
	};

	// Take an unsorted, potentially overlapping set of ranges, and
	// build a selection out of it. 'Consumes' ranges array (modifying
	// it).
	function normalizeSelection(ranges, primIndex) {
	var prim = ranges[primIndex];
	ranges.sort(function(a, b) { return cmp(a.from(), b.from()); });
	primIndex = indexOf(ranges, prim);
	for (var i = 1; i < ranges.length; i++) {
	var cur = ranges[i], prev = ranges[i - 1];
	if (cmp(prev.to(), cur.from()) >= 0) {
	var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
	var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
	if (i <= primIndex) --primIndex;
	ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
	}
	}
	return new Selection(ranges, primIndex);
	}

	function simpleSelection(anchor, head) {
	return new Selection([new Range(anchor, head \|\| anchor)], 0);
	}

	// Most of the external API clips given positions to make sure they
	// actually exist within the document.
	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;}
	function clipPosArray(doc, array) {
	for (var out = [], i = 0; i < array.length; i++) out[i] = clipPos(doc, array[i]);
	return out;
	}

	// SELECTION UPDATES

	// The 'scroll' parameter given to many of these indicated whether
	// the new cursor position should be scrolled into view after
	// modifying the selection.

	// If shift is held or the extend flag is set, extends a range to
	// include a given position (and optionally a second position).
	// Otherwise, simply returns the range between the given positions.
	// Used for cursor motion and such.
	function extendRange(doc, range, head, other) {
	if (doc.cm && doc.cm.display.shift \|\| doc.extend) {
	var anchor = range.anchor;
	if (other) {
	var posBefore = cmp(head, anchor) < 0;
	if (posBefore != (cmp(other, anchor) < 0)) {
	anchor = head;
	head = other;
	} else if (posBefore != (cmp(head, other) < 0)) {
	head = other;
	}
	}
	return new Range(anchor, head);
	} else {
	return new Range(other \|\| head, head);
	}
	}

	// Extend the primary selection range, discard the rest.
	function extendSelection(doc, head, other, options) {
	setSelection(doc, new Selection([extendRange(doc, doc.sel.primary(), head, other)], 0), options);
	}

	// Extend all selections (pos is an array of selections with length
	// equal the number of selections)
	function extendSelections(doc, heads, options) {
	for (var out = [], i = 0; i < doc.sel.ranges.length; i++)
	out[i] = extendRange(doc, doc.sel.ranges[i], heads[i], null);
	var newSel = normalizeSelection(out, doc.sel.primIndex);
	setSelection(doc, newSel, options);
	}

	// Updates a single range in the selection.
	function replaceOneSelection(doc, i, range, options) {
	var ranges = doc.sel.ranges.slice(0);
	ranges[i] = range;
	setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
	}

	// Reset the selection to a single range.
	function setSimpleSelection(doc, anchor, head, options) {
	setSelection(doc, simpleSelection(anchor, head), options);
	}

	// Give beforeSelectionChange handlers a change to influence a
	// selection update.
	function filterSelectionChange(doc, sel) {
	var obj = {
	ranges: sel.ranges,
	update: function(ranges) {
	this.ranges = [];
	for (var i = 0; i < ranges.length; i++)
	this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
	clipPos(doc, ranges[i].head));
	}
	};
	signal(doc, "beforeSelectionChange", doc, obj);
	if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
	if (obj.ranges != sel.ranges) return normalizeSelection(obj.ranges, obj.ranges.length - 1);
	else return sel;
	}

	function setSelectionReplaceHistory(doc, sel, options) {
	var done = doc.history.done, last = lst(done);
	if (last && last.ranges) {
	done[done.length - 1] = sel;
	setSelectionNoUndo(doc, sel, options);
	} else {
	setSelection(doc, sel, options);
	}
	}

	// Set a new selection.
	function setSelection(doc, sel, options) {
	setSelectionNoUndo(doc, sel, options);
	addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
	}

	function setSelectionNoUndo(doc, sel, options) {
	if (hasHandler(doc, "beforeSelectionChange") \|\| doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
	sel = filterSelectionChange(doc, sel);

	var bias = options && options.bias \|\|
	(cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
	setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

	if (!(options && options.scroll === false) && doc.cm)
	ensureCursorVisible(doc.cm);
	}

	function setSelectionInner(doc, sel) {
	if (sel.equals(doc.sel)) return;

	doc.sel = sel;

	if (doc.cm) {
	doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
	signalCursorActivity(doc.cm);
	}
	signalLater(doc, "cursorActivity", doc);
	}

	// Verify that the selection does not partially select any atomic
	// marked ranges.
	function reCheckSelection(doc) {
	setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll);
	}

	// Return a selection that does not partially select any atomic
	// ranges.
	function skipAtomicInSelection(doc, sel, bias, mayClear) {
	var out;
	for (var i = 0; i < sel.ranges.length; i++) {
	var range = sel.ranges[i];
	var newAnchor = skipAtomic(doc, range.anchor, bias, mayClear);
	var newHead = skipAtomic(doc, range.head, bias, mayClear);
	if (out \|\| newAnchor != range.anchor \|\| newHead != range.head) {
	if (!out) out = sel.ranges.slice(0, i);
	out[i] = new Range(newAnchor, newHead);
	}
	}
	return out ? normalizeSelection(out, sel.primIndex) : sel;
	}

	// Ensure a given position is not inside an atomic range.
	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 ? -1 : 1);
	if (cmp(newPos, curPos) == 0) {
	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;
	}
	}

	// SELECTION DRAWING

	function updateSelection(cm) {
	cm.display.input.showSelection(cm.display.input.prepareSelection());
	}

	function prepareSelection(cm, primary) {
	var doc = cm.doc, result = {};
	var curFragment = result.cursors = document.createDocumentFragment();
	var selFragment = result.selection = document.createDocumentFragment();

	for (var i = 0; i < doc.sel.ranges.length; i++) {
	if (primary === false && i == doc.sel.primIndex) continue;
	var range = doc.sel.ranges[i];
	var collapsed = range.empty();
	if (collapsed \|\| cm.options.showCursorWhenSelecting)
	drawSelectionCursor(cm, range.head, curFragment);
	if (!collapsed)
	drawSelectionRange(cm, range, selFragment);
	}
	return result;
	}

	// Draws a cursor for the given range
	function drawSelectionCursor(cm, head, output) {
	var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

	var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
	cursor.style.left = pos.left + "px";
	cursor.style.top = pos.top + "px";
	cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

	if (pos.other) {
	// Secondary cursor, shown when on a 'jump' in bi-directional text
	var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
	otherCursor.style.display = "";
	otherCursor.style.left = pos.other.left + "px";
	otherCursor.style.top = pos.other.top + "px";
	otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
	}
	}

	// Draws the given range as a highlighted selection
	function drawSelectionRange(cm, range, output) {
	var display = cm.display, doc = cm.doc;
	var fragment = document.createDocumentFragment();
	var padding = paddingH(cm.display), leftSide = padding.left;
	var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;

	function add(left, top, width, bottom) {
	if (top < 0) top = 0;
	top = Math.round(top);
	bottom = Math.round(bottom);
	fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
	"px; top: " + top + "px; width: " + (width == null ? rightSide - 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 = leftSide;
	if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
	add(left, leftPos.top, null, leftPos.bottom);
	left = leftSide;
	if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
	}
	if (toArg == null && to == lineLen) right = rightSide;
	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 < leftSide + 1) left = leftSide;
	add(left, rightPos.top, right - left, rightPos.bottom);
	});
	return {start: start, end: end};
	}

	var sFrom = range.from(), sTo = range.to();
	if (sFrom.line == sTo.line) {
	drawForLine(sFrom.line, sFrom.ch, sTo.ch);
	} else {
	var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
	var singleVLine = visualLine(fromLine) == visualLine(toLine);
	var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
	var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
	if (singleVLine) {
	if (leftEnd.top < rightStart.top - 2) {
	add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
	add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
	} else {
	add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
	}
	}
	if (leftEnd.bottom < rightStart.top)
	add(leftSide, leftEnd.bottom, null, rightStart.top);
	}

	output.appendChild(fragment);
	}

	// Cursor-blinking
	function restartBlink(cm) {
	if (!cm.state.focused) return;
	var display = cm.display;
	clearInterval(display.blinker);
	var on = true;
	display.cursorDiv.style.visibility = "";
	if (cm.options.cursorBlinkRate > 0)
	display.blinker = setInterval(function() {
	display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
	}, cm.options.cursorBlinkRate);
	else if (cm.options.cursorBlinkRate < 0)
	display.cursorDiv.style.visibility = "hidden";
	}

	// HIGHLIGHT WORKER

	function startWorker(cm, time) {
	if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo)
	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.viewTo) return;
	var end = +new Date + cm.options.workTime;
	var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
	var changedLines = [];

	doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
	if (doc.frontier >= cm.display.viewFrom) { // Visible
	var oldStyles = line.styles;
	var highlighted = highlightLine(cm, line, state, true);
	line.styles = highlighted.styles;
	var oldCls = line.styleClasses, newCls = highlighted.classes;
	if (newCls) line.styleClasses = newCls;
	else if (oldCls) line.styleClasses = null;
	var ischange = !oldStyles \|\| oldStyles.length != line.styles.length \|\|
	oldCls != newCls && (!oldCls \|\| !newCls \|\| oldCls.bgClass != newCls.bgClass \|\| oldCls.textClass != newCls.textClass);
	for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
	if (ischange) changedLines.push(doc.frontier);
	line.stateAfter = copyState(doc.mode, state);
	} else {
	processLine(cm, line.text, 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 (changedLines.length) runInOp(cm, function() {
	for (var i = 0; i < changedLines.length; i++)
	regLineChange(cm, changedLines[i], "text");
	});
	}

	// 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.text, state);
	var save = pos == n - 1 \|\| pos % 5 == 0 \|\| pos >= display.viewFrom && pos < display.viewTo;
	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 paddingH(display) {
	if (display.cachedPaddingH) return display.cachedPaddingH;
	var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
	var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
	var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
	if (!isNaN(data.left) && !isNaN(data.right)) display.cachedPaddingH = data;
	return data;
	}

	function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth; }
	function displayWidth(cm) {
	return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth;
	}
	function displayHeight(cm) {
	return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight;
	}

	// Ensure the lineView.wrapping.heights array is populated. This is
	// an array of bottom offsets for the lines that make up a drawn
	// line. When lineWrapping is on, there might be more than one
	// height.
	function ensureLineHeights(cm, lineView, rect) {
	var wrapping = cm.options.lineWrapping;
	var curWidth = wrapping && displayWidth(cm);
	if (!lineView.measure.heights \|\| wrapping && lineView.measure.width != curWidth) {
	var heights = lineView.measure.heights = [];
	if (wrapping) {
	lineView.measure.width = curWidth;
	var rects = lineView.text.firstChild.getClientRects();
	for (var i = 0; i < rects.length - 1; i++) {
	var cur = rects[i], next = rects[i + 1];
	if (Math.abs(cur.bottom - next.bottom) > 2)
	heights.push((cur.bottom + next.top) / 2 - rect.top);
	}
	}
	heights.push(rect.bottom - rect.top);
	}
	}

	// Find a line map (mapping character offsets to text nodes) and a
	// measurement cache for the given line number. (A line view might
	// contain multiple lines when collapsed ranges are present.)
	function mapFromLineView(lineView, line, lineN) {
	if (lineView.line == line)
	return {map: lineView.measure.map, cache: lineView.measure.cache};
	for (var i = 0; i < lineView.rest.length; i++)
	if (lineView.rest[i] == line)
	return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]};
	for (var i = 0; i < lineView.rest.length; i++)
	if (lineNo(lineView.rest[i]) > lineN)
	return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i], before: true};
	}

	// Render a line into the hidden node display.externalMeasured. Used
	// when measurement is needed for a line that's not in the viewport.
	function updateExternalMeasurement(cm, line) {
	line = visualLine(line);
	var lineN = lineNo(line);
	var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
	view.lineN = lineN;
	var built = view.built = buildLineContent(cm, view);
	view.text = built.pre;
	removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
	return view;
	}

	// Get a {top, bottom, left, right} box (in line-local coordinates)
	// for a given character.
	function measureChar(cm, line, ch, bias) {
	return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias);
	}

	// Find a line view that corresponds to the given line number.
	function findViewForLine(cm, lineN) {
	if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
	return cm.display.view[findViewIndex(cm, lineN)];
	var ext = cm.display.externalMeasured;
	if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
	return ext;
	}

	// Measurement can be split in two steps, the set-up work that
	// applies to the whole line, and the measurement of the actual
	// character. Functions like coordsChar, that need to do a lot of
	// measurements in a row, can thus ensure that the set-up work is
	// only done once.
	function prepareMeasureForLine(cm, line) {
	var lineN = lineNo(line);
	var view = findViewForLine(cm, lineN);
	if (view && !view.text) {
	view = null;
	} else if (view && view.changes) {
	updateLineForChanges(cm, view, lineN, getDimensions(cm));
	cm.curOp.forceUpdate = true;
	}
	if (!view)
	view = updateExternalMeasurement(cm, line);

	var info = mapFromLineView(view, line, lineN);
	return {
	line: line, view: view, rect: null,
	map: info.map, cache: info.cache, before: info.before,
	hasHeights: false
	};
	}

	// Given a prepared measurement object, measures the position of an
	// actual character (or fetches it from the cache).
	function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
	if (prepared.before) ch = -1;
	var key = ch + (bias \|\| ""), found;
	if (prepared.cache.hasOwnProperty(key)) {
	found = prepared.cache[key];
	} else {
	if (!prepared.rect)
	prepared.rect = prepared.view.text.getBoundingClientRect();
	if (!prepared.hasHeights) {
	ensureLineHeights(cm, prepared.view, prepared.rect);
	prepared.hasHeights = true;
	}
	found = measureCharInner(cm, prepared, ch, bias);
	if (!found.bogus) prepared.cache[key] = found;
	}
	return {left: found.left, right: found.right,
	top: varHeight ? found.rtop : found.top,
	bottom: varHeight ? found.rbottom : found.bottom};
	}

	var nullRect = {left: 0, right: 0, top: 0, bottom: 0};

	function nodeAndOffsetInLineMap(map, ch, bias) {
	var node, start, end, collapse;
	// First, search the line map for the text node corresponding to,
	// or closest to, the target character.
	for (var i = 0; i < map.length; i += 3) {
	var mStart = map[i], mEnd = map[i + 1];
	if (ch < mStart) {
	start = 0; end = 1;
	collapse = "left";
	} else if (ch < mEnd) {
	start = ch - mStart;
	end = start + 1;
	} else if (i == map.length - 3 \|\| ch == mEnd && map[i + 3] > ch) {
	end = mEnd - mStart;
	start = end - 1;
	if (ch >= mEnd) collapse = "right";
	}
	if (start != null) {
	node = map[i + 2];
	if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
	collapse = bias;
	if (bias == "left" && start == 0)
	while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
	node = map[(i -= 3) + 2];
	collapse = "left";
	}
	if (bias == "right" && start == mEnd - mStart)
	while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
	node = map[(i += 3) + 2];
	collapse = "right";
	}
	break;
	}
	}
	return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd};
	}

	function measureCharInner(cm, prepared, ch, bias) {
	var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
	var node = place.node, start = place.start, end = place.end, collapse = place.collapse;

	var rect;
	if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
	for (var i = 0; i < 4; i++) { // Retry a maximum of 4 times when nonsense rectangles are returned
	while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) --start;
	while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) ++end;
	if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) {
	rect = node.parentNode.getBoundingClientRect();
	} else if (ie && cm.options.lineWrapping) {
	var rects = range(node, start, end).getClientRects();
	if (rects.length)
	rect = rects[bias == "right" ? rects.length - 1 : 0];
	else
	rect = nullRect;
	} else {
	rect = range(node, start, end).getBoundingClientRect() \|\| nullRect;
	}
	if (rect.left \|\| rect.right \|\| start == 0) break;
	end = start;
	start = start - 1;
	collapse = "right";
	}
	if (ie && ie_version < 11) rect = maybeUpdateRectForZooming(cm.display.measure, rect);
	} else { // If it is a widget, simply get the box for the whole widget.
	if (start > 0) collapse = bias = "right";
	var rects;
	if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
	rect = rects[bias == "right" ? rects.length - 1 : 0];
	else
	rect = node.getBoundingClientRect();
	}
	if (ie && ie_version < 9 && !start && (!rect \|\| !rect.left && !rect.right)) {
	var rSpan = node.parentNode.getClientRects()[0];
	if (rSpan)
	rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom};
	else
	rect = nullRect;
	}

	var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
	var mid = (rtop + rbot) / 2;
	var heights = prepared.view.measure.heights;
	for (var i = 0; i < heights.length - 1; i++)
	if (mid < heights[i]) break;
	var top = i ? heights[i - 1] : 0, bot = heights[i];
	var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
	right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
	top: top, bottom: bot};
	if (!rect.left && !rect.right) result.bogus = true;
	if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }

	return result;
	}

	// Work around problem with bounding client rects on ranges being
	// returned incorrectly when zoomed on IE10 and below.
	function maybeUpdateRectForZooming(measure, rect) {
	if (!window.screen \|\| screen.logicalXDPI == null \|\|
	screen.logicalXDPI == screen.deviceXDPI \|\| !hasBadZoomedRects(measure))
	return rect;
	var scaleX = screen.logicalXDPI / screen.deviceXDPI;
	var scaleY = screen.logicalYDPI / screen.deviceYDPI;
	return {left: rect.left * scaleX, right: rect.right * scaleX,
	top: rect.top * scaleY, bottom: rect.bottom * scaleY};
	}

	function clearLineMeasurementCacheFor(lineView) {
	if (lineView.measure) {
	lineView.measure.cache = {};
	lineView.measure.heights = null;
	if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
	lineView.measure.caches[i] = {};
	}
	}

	function clearLineMeasurementCache(cm) {
	cm.display.externalMeasure = null;
	removeChildren(cm.display.lineMeasure);
	for (var i = 0; i < cm.display.view.length; i++)
	clearLineMeasurementCacheFor(cm.display.view[i]);
	}

	function clearCaches(cm) {
	clearLineMeasurementCache(cm);
	cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = 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; }

	// Converts a {top, bottom, left, right} box from line-local
	// coordinates into another coordinate system. Context may be one of
	// "line", "div" (display.lineDiv), "local"/null (editor), "window",
	// 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(lineObj);
	if (context == "local") yOff += paddingTop(cm.display);
	else yOff -= cm.display.viewOffset;
	if (context == "page" \|\| context == "window") {
	var lOff = cm.display.lineSpace.getBoundingClientRect();
	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;
	}

	// Coverts a box from "div" coords to another coordinate system.
	// Context may be "window", "page", "div", or "local"/null.
	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 = cm.display.sizer.getBoundingClientRect();
	left += localBox.left;
	top += localBox.top;
	}

	var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
	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, bias), context);
	}

	// Returns a box for a given cursor position, which may have an
	// 'other' property containing the position of the secondary cursor
	// on a bidi boundary.
	function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
	lineObj = lineObj \|\| getLine(cm.doc, pos.line);
	if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj);
	function get(ch, right) {
	var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
	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;
	}

	// Used to cheaply estimate the coordinates for a position. Used for
	// intermediate scroll updates.
	function estimateCoords(cm, pos) {
	var left = 0, pos = clipPos(cm.doc, pos);
	if (!cm.options.lineWrapping) left = charWidth(cm.display) * pos.ch;
	var lineObj = getLine(cm.doc, pos.line);
	var top = heightAtLine(lineObj) + paddingTop(cm.display);
	return {left: left, right: left, top: top, bottom: top + lineObj.height};
	}

	// Positions returned by coordsChar contain some extra information.
	// xRel is the relative x position of the input coordinates compared
	// to the found position (so xRel > 0 means the coordinates are to
	// the right of the character position, for example). When outside
	// is true, that means the coordinates lie outside the line's
	// vertical range.
	function PosWithInfo(line, ch, outside, xRel) {
	var pos = Pos(line, ch);
	pos.xRel = xRel;
	if (outside) pos.outside = true;
	return pos;
	}

	// Compute the character position closest to the given coordinates.
	// Input must be lineSpace-local ("div" coordinate system).
	function coordsChar(cm, x, y) {
	var doc = cm.doc;
	y += cm.display.viewOffset;
	if (y < 0) return PosWithInfo(doc.first, 0, true, -1);
	var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
	if (lineN > last)
	return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
	if (x < 0) x = 0;

	var lineObj = getLine(doc, lineN);
	for (;;) {
	var found = coordsCharInner(cm, lineObj, lineN, x, y);
	var merged = collapsedSpanAtEnd(lineObj);
	var mergedPos = merged && merged.find(0, true);
	if (merged && (found.ch > mergedPos.from.ch \|\| found.ch == mergedPos.from.ch && found.xRel > 0))
	lineN = lineNo(lineObj = mergedPos.to.line);
	else
	return found;
	}
	}

	function coordsCharInner(cm, lineObj, lineNo, x, y) {
	var innerOff = y - heightAtLine(lineObj);
	var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
	var preparedMeasure = prepareMeasureForLine(cm, lineObj);

	function getX(ch) {
	var sp = cursorCoords(cm, Pos(lineNo, ch), "line", lineObj, preparedMeasure);
	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(lineObj.text.charAt(ch))) ++ch;
	var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
	xDiff < -1 ? -1 : xDiff > 1 ? 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;
	// Compute the default text height.
	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;
	}

	// Compute the default character width.
	function charWidth(display) {
	if (display.cachedCharWidth != null) return display.cachedCharWidth;
	var anchor = elt("span", "xxxxxxxxxx");
	var pre = elt("pre", [anchor]);
	removeChildrenAndAdd(display.measure, pre);
	var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
	if (width > 2) display.cachedCharWidth = width;
	return width \|\| 10;
	}

	// OPERATIONS

	// Operations are used to wrap a series of changes to the editor
	// state in such a way that each change won't have to update the
	// cursor and display (which would be awkward, slow, and
	// error-prone). Instead, display updates are batched and then all
	// combined and executed at once.

	var operationGroup = null;

	var nextOpId = 0;
	// Start a new operation.
	function startOperation(cm) {
	cm.curOp = {
	cm: cm,
	viewChanged: false, // Flag that indicates that lines might need to be redrawn
	startHeight: cm.doc.height, // Used to detect need to update scrollbar
	forceUpdate: false, // Used to force a redraw
	updateInput: null, // Whether to reset the input textarea
	typing: false, // Whether this reset should be careful to leave existing text (for compositing)
	changeObjs: null, // Accumulated changes, for firing change events
	cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
	cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
	selectionChanged: false, // Whether the selection needs to be redrawn
	updateMaxLine: false, // Set when the widest line needs to be determined anew
	scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
	scrollToPos: null, // Used to scroll to a specific position
	focus: false,
	id: ++nextOpId // Unique ID
	};
	if (operationGroup) {
	operationGroup.ops.push(cm.curOp);
	} else {
	cm.curOp.ownsGroup = operationGroup = {
	ops: [cm.curOp],
	delayedCallbacks: []
	};
	}
	}

	function fireCallbacksForOps(group) {
	// Calls delayed callbacks and cursorActivity handlers until no
	// new ones appear
	var callbacks = group.delayedCallbacks, i = 0;
	do {
	for (; i < callbacks.length; i++)
	callbacks[i].call(null);
	for (var j = 0; j < group.ops.length; j++) {
	var op = group.ops[j];
	if (op.cursorActivityHandlers)
	while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
	op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
	}
	} while (i < callbacks.length);
	}

	// Finish an operation, updating the display and signalling delayed events
	function endOperation(cm) {
	var op = cm.curOp, group = op.ownsGroup;
	if (!group) return;

	try { fireCallbacksForOps(group); }
	finally {
	operationGroup = null;
	for (var i = 0; i < group.ops.length; i++)
	group.ops[i].cm.curOp = null;
	endOperations(group);
	}
	}

	// The DOM updates done when an operation finishes are batched so
	// that the minimum number of relayouts are required.
	function endOperations(group) {
	var ops = group.ops;
	for (var i = 0; i < ops.length; i++) // Read DOM
	endOperation_R1(ops[i]);
	for (var i = 0; i < ops.length; i++) // Write DOM (maybe)
	endOperation_W1(ops[i]);
	for (var i = 0; i < ops.length; i++) // Read DOM
	endOperation_R2(ops[i]);
	for (var i = 0; i < ops.length; i++) // Write DOM (maybe)
	endOperation_W2(ops[i]);
	for (var i = 0; i < ops.length; i++) // Read DOM
	endOperation_finish(ops[i]);
	}

	function endOperation_R1(op) {
	var cm = op.cm, display = cm.display;
	maybeClipScrollbars(cm);
	if (op.updateMaxLine) findMaxLine(cm);

	op.mustUpdate = op.viewChanged \|\| op.forceUpdate \|\| op.scrollTop != null \|\|
	op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom \|\|
	op.scrollToPos.to.line >= display.viewTo) \|\|
	display.maxLineChanged && cm.options.lineWrapping;
	op.update = op.mustUpdate &&
	new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
	}

	function endOperation_W1(op) {
	op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
	}

	function endOperation_R2(op) {
	var cm = op.cm, display = cm.display;
	if (op.updatedDisplay) updateHeightsInViewport(cm);

	op.barMeasure = measureForScrollbars(cm);

	// If the max line changed since it was last measured, measure it,
	// and ensure the document's width matches it.
	// updateDisplay_W2 will use these properties to do the actual resizing
	if (display.maxLineChanged && !cm.options.lineWrapping) {
	op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
	cm.display.sizerWidth = op.adjustWidthTo;
	op.barMeasure.scrollWidth =
	Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
	op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
	}

	if (op.updatedDisplay \|\| op.selectionChanged)
	op.preparedSelection = display.input.prepareSelection();
	}

	function endOperation_W2(op) {
	var cm = op.cm;

	if (op.adjustWidthTo != null) {
	cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
	if (op.maxScrollLeft < cm.doc.scrollLeft)
	setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
	cm.display.maxLineChanged = false;
	}

	if (op.preparedSelection)
	cm.display.input.showSelection(op.preparedSelection);
	if (op.updatedDisplay)
	setDocumentHeight(cm, op.barMeasure);
	if (op.updatedDisplay \|\| op.startHeight != cm.doc.height)
	updateScrollbars(cm, op.barMeasure);

	if (op.selectionChanged) restartBlink(cm);

	if (cm.state.focused && op.updateInput)
	cm.display.input.reset(op.typing);
	if (op.focus && op.focus == activeElt()) ensureFocus(op.cm);
	}

	function endOperation_finish(op) {
	var cm = op.cm, display = cm.display, doc = cm.doc;

	if (op.updatedDisplay) postUpdateDisplay(cm, op.update);

	// Abort mouse wheel delta measurement, when scrolling explicitly
	if (display.wheelStartX != null && (op.scrollTop != null \|\| op.scrollLeft != null \|\| op.scrollToPos))
	display.wheelStartX = display.wheelStartY = null;

	// Propagate the scroll position to the actual DOM scroller
	if (op.scrollTop != null && (display.scroller.scrollTop != op.scrollTop \|\| op.forceScroll)) {
	doc.scrollTop = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop));
	display.scrollbars.setScrollTop(doc.scrollTop);
	display.scroller.scrollTop = doc.scrollTop;
	}
	if (op.scrollLeft != null && (display.scroller.scrollLeft != op.scrollLeft \|\| op.forceScroll)) {
	doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - displayWidth(cm), op.scrollLeft));
	display.scrollbars.setScrollLeft(doc.scrollLeft);
	display.scroller.scrollLeft = doc.scrollLeft;
	alignHorizontally(cm);
	}
	// If we need to scroll a specific position into view, do so.
	if (op.scrollToPos) {
	var coords = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
	clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
	if (op.scrollToPos.isCursor && cm.state.focused) maybeScrollWindow(cm, coords);
	}

	// Fire events for markers that are hidden/unidden by editing or
	// undoing
	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");

	if (display.wrapper.offsetHeight)
	doc.scrollTop = cm.display.scroller.scrollTop;

	// Fire change events, and delayed event handlers
	if (op.changeObjs)
	signal(cm, "changes", cm, op.changeObjs);
	if (op.update)
	op.update.finish();
	}

	// Run the given function in an operation
	function runInOp(cm, f) {
	if (cm.curOp) return f();
	startOperation(cm);
	try { return f(); }
	finally { endOperation(cm); }
	}
	// Wraps a function in an operation. Returns the wrapped function.
	function operation(cm, f) {
	return function() {
	if (cm.curOp) return f.apply(cm, arguments);
	startOperation(cm);
	try { return f.apply(cm, arguments); }
	finally { endOperation(cm); }
	};
	}
	// Used to add methods to editor and doc instances, wrapping them in
	// operations.
	function methodOp(f) {
	return function() {
	if (this.curOp) return f.apply(this, arguments);
	startOperation(this);
	try { return f.apply(this, arguments); }
	finally { endOperation(this); }
	};
	}
	function docMethodOp(f) {
	return function() {
	var cm = this.cm;
	if (!cm \|\| cm.curOp) return f.apply(this, arguments);
	startOperation(cm);
	try { return f.apply(this, arguments); }
	finally { endOperation(cm); }
	};
	}

	// VIEW TRACKING

	// These objects are used to represent the visible (currently drawn)
	// part of the document. A LineView may correspond to multiple
	// logical lines, if those are connected by collapsed ranges.
	function LineView(doc, line, lineN) {
	// The starting line
	this.line = line;
	// Continuing lines, if any
	this.rest = visualLineContinued(line);
	// Number of logical lines in this visual line
	this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
	this.node = this.text = null;
	this.hidden = lineIsHidden(doc, line);
	}

	// Create a range of LineView objects for the given lines.
	function buildViewArray(cm, from, to) {
	var array = [], nextPos;
	for (var pos = from; pos < to; pos = nextPos) {
	var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
	nextPos = pos + view.size;
	array.push(view);
	}
	return array;
	}

	// Updates the display.view data structure for a given change to the
	// document. From and to are in pre-change coordinates. Lendiff is
	// the amount of lines added or subtracted by the change. This is
	// used for changes that span multiple lines, or change the way
	// lines are divided into visual lines. regLineChange (below)
	// registers single-line changes.
	function regChange(cm, from, to, lendiff) {
	if (from == null) from = cm.doc.first;
	if (to == null) to = cm.doc.first + cm.doc.size;
	if (!lendiff) lendiff = 0;

	var display = cm.display;
	if (lendiff && to < display.viewTo &&
	(display.updateLineNumbers == null \|\| display.updateLineNumbers > from))
	display.updateLineNumbers = from;

	cm.curOp.viewChanged = true;

	if (from >= display.viewTo) { // Change after
	if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
	resetView(cm);
	} else if (to <= display.viewFrom) { // Change before
	if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
	resetView(cm);
	} else {
	display.viewFrom += lendiff;
	display.viewTo += lendiff;
	}
	} else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
	resetView(cm);
	} else if (from <= display.viewFrom) { // Top overlap
	var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
	if (cut) {
	display.view = display.view.slice(cut.index);
	display.viewFrom = cut.lineN;
	display.viewTo += lendiff;
	} else {
	resetView(cm);
	}
	} else if (to >= display.viewTo) { // Bottom overlap
	var cut = viewCuttingPoint(cm, from, from, -1);
	if (cut) {
	display.view = display.view.slice(0, cut.index);
	display.viewTo = cut.lineN;
	} else {
	resetView(cm);
	}
	} else { // Gap in the middle
	var cutTop = viewCuttingPoint(cm, from, from, -1);
	var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
	if (cutTop && cutBot) {
	display.view = display.view.slice(0, cutTop.index)
	.concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
	.concat(display.view.slice(cutBot.index));
	display.viewTo += lendiff;
	} else {
	resetView(cm);
	}
	}

	var ext = display.externalMeasured;
	if (ext) {
	if (to < ext.lineN)
	ext.lineN += lendiff;
	else if (from < ext.lineN + ext.size)
	display.externalMeasured = null;
	}
	}

	// Register a change to a single line. Type must be one of "text",
	// "gutter", "class", "widget"
	function regLineChange(cm, line, type) {
	cm.curOp.viewChanged = true;
	var display = cm.display, ext = cm.display.externalMeasured;
	if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
	display.externalMeasured = null;

	if (line < display.viewFrom \|\| line >= display.viewTo) return;
	var lineView = display.view[findViewIndex(cm, line)];
	if (lineView.node == null) return;
	var arr = lineView.changes \|\| (lineView.changes = []);
	if (indexOf(arr, type) == -1) arr.push(type);
	}

	// Clear the view.
	function resetView(cm) {
	cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
	cm.display.view = [];
	cm.display.viewOffset = 0;
	}

	// Find the view element corresponding to a given line. Return null
	// when the line isn't visible.
	function findViewIndex(cm, n) {
	if (n >= cm.display.viewTo) return null;
	n -= cm.display.viewFrom;
	if (n < 0) return null;
	var view = cm.display.view;
	for (var i = 0; i < view.length; i++) {
	n -= view[i].size;
	if (n < 0) return i;
	}
	}

	function viewCuttingPoint(cm, oldN, newN, dir) {
	var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
	if (!sawCollapsedSpans \|\| newN == cm.doc.first + cm.doc.size)
	return {index: index, lineN: newN};
	for (var i = 0, n = cm.display.viewFrom; i < index; i++)
	n += view[i].size;
	if (n != oldN) {
	if (dir > 0) {
	if (index == view.length - 1) return null;
	diff = (n + view[index].size) - oldN;
	index++;
	} else {
	diff = n - oldN;
	}
	oldN += diff; newN += diff;
	}
	while (visualLineNo(cm.doc, newN) != newN) {
	if (index == (dir < 0 ? 0 : view.length - 1)) return null;
	newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
	index += dir;
	}
	return {index: index, lineN: newN};
	}

	// Force the view to cover a given range, adding empty view element
	// or clipping off existing ones as needed.
	function adjustView(cm, from, to) {
	var display = cm.display, view = display.view;
	if (view.length == 0 \|\| from >= display.viewTo \|\| to <= display.viewFrom) {
	display.view = buildViewArray(cm, from, to);
	display.viewFrom = from;
	} else {
	if (display.viewFrom > from)
	display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
	else if (display.viewFrom < from)
	display.view = display.view.slice(findViewIndex(cm, from));
	display.viewFrom = from;
	if (display.viewTo < to)
	display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
	else if (display.viewTo > to)
	display.view = display.view.slice(0, findViewIndex(cm, to));
	}
	display.viewTo = to;
	}

	// Count the number of lines in the view whose DOM representation is
	// out of date (or nonexistent).
	function countDirtyView(cm) {
	var view = cm.display.view, dirty = 0;
	for (var i = 0; i < view.length; i++) {
	var lineView = view[i];
	if (!lineView.hidden && (!lineView.node \|\| lineView.changes)) ++dirty;
	}
	return dirty;
	}

	// EVENT HANDLERS

	// Attach the necessary event handlers when initializing the editor
	function registerEventHandlers(cm) {
	var d = cm.display;
	on(d.scroller, "mousedown", operation(cm, onMouseDown));
	// Older IE's will not fire a second mousedown for a double click
	if (ie && ie_version < 11)
	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 = cm.findWordAt(pos);
	extendSelection(cm.doc, word.anchor, word.head);
	}));
	else
	on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) \|\| e_preventDefault(e); });
	// Some browsers fire contextmenu after opening the menu, at
	// which point we can't mess with it anymore. Context menu is
	// handled in onMouseDown for these browsers.
	if (!captureRightClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});

	// Used to suppress mouse event handling when a touch happens
	var touchFinished, prevTouch = {end: 0};
	function finishTouch() {
	if (d.activeTouch) {
	touchFinished = setTimeout(function() {d.activeTouch = null;}, 1000);
	prevTouch = d.activeTouch;
	prevTouch.end = +new Date;
	}
	};
	function isMouseLikeTouchEvent(e) {
	if (e.touches.length != 1) return false;
	var touch = e.touches[0];
	return touch.radiusX <= 1 && touch.radiusY <= 1;
	}
	function farAway(touch, other) {
	if (other.left == null) return true;
	var dx = other.left - touch.left, dy = other.top - touch.top;
	return dx * dx + dy * dy > 20 * 20;
	}
	on(d.scroller, "touchstart", function(e) {
	if (!isMouseLikeTouchEvent(e)) {
	clearTimeout(touchFinished);
	var now = +new Date;
	d.activeTouch = {start: now, moved: false,
	prev: now - prevTouch.end <= 300 ? prevTouch : null};
	if (e.touches.length == 1) {
	d.activeTouch.left = e.touches[0].pageX;
	d.activeTouch.top = e.touches[0].pageY;
	}
	}
	});
	on(d.scroller, "touchmove", function() {
	if (d.activeTouch) d.activeTouch.moved = true;
	});
	on(d.scroller, "touchend", function(e) {
	var touch = d.activeTouch;
	if (touch && !eventInWidget(d, e) && touch.left != null &&
	!touch.moved && new Date - touch.start < 300) {
	var pos = cm.coordsChar(d.activeTouch, "page"), range;
	if (!touch.prev \|\| farAway(touch, touch.prev)) // Single tap
	range = new Range(pos, pos);
	else if (!touch.prev.prev \|\| farAway(touch, touch.prev.prev)) // Double tap
	range = cm.findWordAt(pos);
	else // Triple tap
	range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
	cm.setSelection(range.anchor, range.head);
	cm.focus();
	e_preventDefault(e);
	}
	finishTouch();
	});
	on(d.scroller, "touchcancel", finishTouch);

	// Sync scrolling between fake scrollbars and real scrollable
	// area, ensure viewport is updated when scrolling.
	on(d.scroller, "scroll", function() {
	if (d.scroller.clientHeight) {
	setScrollTop(cm, d.scroller.scrollTop);
	setScrollLeft(cm, d.scroller.scrollLeft, true);
	signal(cm, "scroll", cm);
	}
	});

	// Listen to wheel events in order to try and update the viewport on time.
	on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
	on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});

	// Prevent wrapper from ever scrolling
	on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });

	d.dragFunctions = {
	enter: function(e) {if (!signalDOMEvent(cm, e)) e_stop(e);},
	over: function(e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
	start: function(e){onDragStart(cm, e);},
	drop: operation(cm, onDrop),
	leave: function() {clearDragCursor(cm);}
	};

	var inp = d.input.getField();
	on(inp, "keyup", function(e) { onKeyUp.call(cm, e); });
	on(inp, "keydown", operation(cm, onKeyDown));
	on(inp, "keypress", operation(cm, onKeyPress));
	on(inp, "focus", bind(onFocus, cm));
	on(inp, "blur", bind(onBlur, cm));
	}

	function dragDropChanged(cm, value, old) {
	var wasOn = old && old != CodeMirror.Init;
	if (!value != !wasOn) {
	var funcs = cm.display.dragFunctions;
	var toggle = value ? on : off;
	toggle(cm.display.scroller, "dragstart", funcs.start);
	toggle(cm.display.scroller, "dragenter", funcs.enter);
	toggle(cm.display.scroller, "dragover", funcs.over);
	toggle(cm.display.scroller, "dragleave", funcs.leave);
	toggle(cm.display.scroller, "drop", funcs.drop);
	}
	}

	// Called when the window resizes
	function onResize(cm) {
	var d = cm.display;
	if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
	return;
	// Might be a text scaling operation, clear size caches.
	d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
	d.scrollbarsClipped = false;
	cm.setSize();
	}

	// MOUSE EVENTS

	// Return true when the given mouse event happened in a widget
	function eventInWidget(display, e) {
	for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
	if (!n \|\| (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") \|\|
	(n.parentNode == display.sizer && n != display.mover))
	return true;
	}
	}

	// Given a mouse event, find the corresponding position. If liberal
	// is false, it checks whether a gutter or scrollbar was clicked,
	// and returns null if it was. forRect is used by rectangular
	// selections, and tries to estimate a character position even for
	// coordinates beyond the right of the text.
	function posFromMouse(cm, e, liberal, forRect) {
	var display = cm.display;
	if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") return null;

	var x, y, space = display.lineSpace.getBoundingClientRect();
	// Fails unpredictably on IE[67] when mouse is dragged around quickly.
	try { x = e.clientX - space.left; y = e.clientY - space.top; }
	catch (e) { return null; }
	var coords = coordsChar(cm, x, y), line;
	if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
	var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
	coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
	}
	return coords;
	}

	// A mouse down can be a single click, double click, triple click,
	// start of selection drag, start of text drag, new cursor
	// (ctrl-click), rectangle drag (alt-drag), or xwin
	// middle-click-paste. Or it might be a click on something we should
	// not interfere with, such as a scrollbar or widget.
	function onMouseDown(e) {
	var cm = this, display = cm.display;
	if (display.activeTouch && display.input.supportsTouch() \|\| signalDOMEvent(cm, e)) return;
	display.shift = e.shiftKey;

	if (eventInWidget(display, e)) {
	if (!webkit) {
	// Briefly turn off draggability, to allow widgets to do
	// normal dragging things.
	display.scroller.draggable = false;
	setTimeout(function(){display.scroller.draggable = true;}, 100);
	}
	return;
	}
	if (clickInGutter(cm, e)) return;
	var start = posFromMouse(cm, e);
	window.focus();

	switch (e_button(e)) {
	case 1:
	// #3261: make sure, that we're not starting a second selection
	if (cm.state.selectingText)
	cm.state.selectingText(e);
	else if (start)
	leftButtonDown(cm, e, start);
	else if (e_target(e) == display.scroller)
	e_preventDefault(e);
	break;
	case 2:
	if (webkit) cm.state.lastMiddleDown = +new Date;
	if (start) extendSelection(cm.doc, start);
	setTimeout(function() {display.input.focus();}, 20);
	e_preventDefault(e);
	break;
	case 3:
	if (captureRightClick) onContextMenu(cm, e);
	else delayBlurEvent(cm);
	break;
	}
	}

	var lastClick, lastDoubleClick;
	function leftButtonDown(cm, e, start) {
	if (ie) setTimeout(bind(ensureFocus, cm), 0);
	else cm.curOp.focus = activeElt();

	var now = +new Date, type;
	if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
	type = "triple";
	} else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
	type = "double";
	lastDoubleClick = {time: now, pos: start};
	} else {
	type = "single";
	lastClick = {time: now, pos: start};
	}

	var sel = cm.doc.sel, modifier = mac ? e.metaKey : e.ctrlKey, contained;
	if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) &&
	type == "single" && (contained = sel.contains(start)) > -1 &&
	(cmp((contained = sel.ranges[contained]).from(), start) < 0 \|\| start.xRel > 0) &&
	(cmp(contained.to(), start) > 0 \|\| start.xRel < 0))
	leftButtonStartDrag(cm, e, start, modifier);
	else
	leftButtonSelect(cm, e, start, type, modifier);
	}

	// Start a text drag. When it ends, see if any dragging actually
	// happen, and treat as a click if it didn't.
	function leftButtonStartDrag(cm, e, start, modifier) {
	var display = cm.display, startTime = +new Date;
	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);
	if (!modifier && +new Date - 200 < startTime)
	extendSelection(cm.doc, start);
	// Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
	if (webkit \|\| ie && ie_version == 9)
	setTimeout(function() {document.body.focus(); display.input.focus();}, 20);
	else
	display.input.focus();
	}
	});
	// 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);
	}

	// Normal selection, as opposed to text dragging.
	function leftButtonSelect(cm, e, start, type, addNew) {
	var display = cm.display, doc = cm.doc;
	e_preventDefault(e);

	var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
	if (addNew && !e.shiftKey) {
	ourIndex = doc.sel.contains(start);
	if (ourIndex > -1)
	ourRange = ranges[ourIndex];
	else
	ourRange = new Range(start, start);
	} else {
	ourRange = doc.sel.primary();
	ourIndex = doc.sel.primIndex;
	}

	if (e.altKey) {
	type = "rect";
	if (!addNew) ourRange = new Range(start, start);
	start = posFromMouse(cm, e, true, true);
	ourIndex = -1;
	} else if (type == "double") {
	var word = cm.findWordAt(start);
	if (cm.display.shift \|\| doc.extend)
	ourRange = extendRange(doc, ourRange, word.anchor, word.head);
	else
	ourRange = word;
	} else if (type == "triple") {
	var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)));
	if (cm.display.shift \|\| doc.extend)
	ourRange = extendRange(doc, ourRange, line.anchor, line.head);
	else
	ourRange = line;
	} else {
	ourRange = extendRange(doc, ourRange, start);
	}

	if (!addNew) {
	ourIndex = 0;
	setSelection(doc, new Selection([ourRange], 0), sel_mouse);
	startSel = doc.sel;
	} else if (ourIndex == -1) {
	ourIndex = ranges.length;
	setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
	{scroll: false, origin: "*mouse"});
	} else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single" && !e.shiftKey) {
	setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0));
	startSel = doc.sel;
	} else {
	replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
	}

	var lastPos = start;
	function extendTo(pos) {
	if (cmp(lastPos, pos) == 0) return;
	lastPos = pos;

	if (type == "rect") {
	var ranges = [], tabSize = cm.options.tabSize;
	var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
	var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
	var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
	for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
	line <= end; line++) {
	var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
	if (left == right)
	ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
	else if (text.length > leftPos)
	ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
	}
	if (!ranges.length) ranges.push(new Range(start, start));
	setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
	{origin: "*mouse", scroll: false});
	cm.scrollIntoView(pos);
	} else {
	var oldRange = ourRange;
	var anchor = oldRange.anchor, head = pos;
	if (type != "single") {
	if (type == "double")
	var range = cm.findWordAt(pos);
	else
	var range = new Range(Pos(pos.line, 0), clipPos(doc, Pos(pos.line + 1, 0)));
	if (cmp(range.anchor, anchor) > 0) {
	head = range.head;
	anchor = minPos(oldRange.from(), range.anchor);
	} else {
	head = range.anchor;
	anchor = maxPos(oldRange.to(), range.head);
	}
	}
	var ranges = startSel.ranges.slice(0);
	ranges[ourIndex] = new Range(clipPos(doc, anchor), head);
	setSelection(doc, normalizeSelection(ranges, ourIndex), sel_mouse);
	}
	}

	var editorSize = display.wrapper.getBoundingClientRect();
	// 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, type == "rect");
	if (!cur) return;
	if (cmp(cur, lastPos) != 0) {
	cm.curOp.focus = activeElt();
	extendTo(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) {
	cm.state.selectingText = false;
	counter = Infinity;
	e_preventDefault(e);
	display.input.focus();
	off(document, "mousemove", move);
	off(document, "mouseup", up);
	doc.history.lastSelOrigin = null;
	}

	var move = operation(cm, function(e) {
	if (!e_button(e)) done(e);
	else extend(e);
	});
	var up = operation(cm, done);
	cm.state.selectingText = up;
	on(document, "mousemove", move);
	on(document, "mouseup", up);
	}

	// Determines whether an event happened in the gutter, and fires the
	// handlers for the corresponding event.
	function gutterEvent(cm, e, type, prevent, signalfn) {
	try { var mX = e.clientX, mY = e.clientY; }
	catch(e) { return false; }
	if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) return false;
	if (prevent) e_preventDefault(e);

	var display = cm.display;
	var lineBox = display.lineDiv.getBoundingClientRect();

	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 && g.getBoundingClientRect().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 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;
	clearDragCursor(cm);
	if (signalDOMEvent(cm, e) \|\| eventInWidget(cm.display, 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;
	// Might be a file drop, in which case we simply extract the text
	// and insert it.
	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 = operation(cm, function() {
	text[i] = reader.result;
	if (++read == n) {
	pos = clipPos(cm.doc, pos);
	var change = {from: pos, to: pos,
	text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
	origin: "paste"};
	makeChange(cm.doc, change);
	setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
	}
	});
	reader.readAsText(file);
	};
	for (var i = 0; i < n; ++i) loadFile(files[i], i);
	} else { // Normal drop
	// Don't do a replace if the drop happened inside of the selected text.
	if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
	cm.state.draggingText(e);
	// Ensure the editor is re-focused
	setTimeout(function() {cm.display.input.focus();}, 20);
	return;
	}
	try {
	var text = e.dataTransfer.getData("Text");
	if (text) {
	if (cm.state.draggingText && !(mac ? e.altKey : e.ctrlKey))
	var selected = cm.listSelections();
	setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
	if (selected) for (var i = 0; i < selected.length; ++i)
	replaceRange(cm.doc, "", selected[i].anchor, selected[i].head, "drag");
	cm.replaceSelection(text, "around", "paste");
	cm.display.input.focus();
	}
	}
	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;

	e.dataTransfer.setData("Text", cm.getSelection());

	// 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 (presto) {
	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 (presto) img.parentNode.removeChild(img);
	}
	}

	function onDragOver(cm, e) {
	var pos = posFromMouse(cm, e);
	if (!pos) return;
	var frag = document.createDocumentFragment();
	drawSelectionCursor(cm, pos, frag);
	if (!cm.display.dragCursor) {
	cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
	cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
	}
	removeChildrenAndAdd(cm.display.dragCursor, frag);
	}

	function clearDragCursor(cm) {
	if (cm.display.dragCursor) {
	cm.display.lineSpace.removeChild(cm.display.dragCursor);
	cm.display.dragCursor = null;
	}
	}

	// SCROLL EVENTS

	// Sync the scrollable area and scrollbars, ensure the viewport
	// covers the visible area.
	function setScrollTop(cm, val) {
	if (Math.abs(cm.doc.scrollTop - val) < 2) return;
	cm.doc.scrollTop = val;
	if (!gecko) updateDisplaySimple(cm, {top: val});
	if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
	cm.display.scrollbars.setScrollTop(val);
	if (gecko) updateDisplaySimple(cm);
	startWorker(cm, 100);
	}
	// Sync scroller and scrollbar, ensure the gutter elements are
	// aligned.
	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;
	cm.display.scrollbars.setScrollLeft(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;

	var wheelEventDelta = function(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;
	return {x: dx, y: dy};
	};
	CodeMirror.wheelEventPixels = function(e) {
	var delta = wheelEventDelta(e);
	delta.x *= wheelPixelsPerUnit;
	delta.y *= wheelPixelsPerUnit;
	return delta;
	};

	function onScrollWheel(cm, e) {
	var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;

	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) {
	outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
	for (var i = 0; i < view.length; i++) {
	if (view[i].node == cur) {
	cm.display.currentWheelTarget = cur;
	break outer;
	}
	}
	}
	}

	// 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 && !presto && 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;
	}

	// 'Project' the visible viewport to cover the area that is being
	// scrolled into view (if we know enough to estimate it).
	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);
	updateDisplaySimple(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;
	}
	}
	}

	// KEY EVENTS

	// Run a handler that was bound to a key.
	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
	cm.display.input.ensurePolled();
	var prevShift = cm.display.shift, done = false;
	try {
	if (isReadOnly(cm)) cm.state.suppressEdits = true;
	if (dropShift) cm.display.shift = false;
	done = bound(cm) != Pass;
	} finally {
	cm.display.shift = prevShift;
	cm.state.suppressEdits = false;
	}
	return done;
	}

	function lookupKeyForEditor(cm, name, handle) {
	for (var i = 0; i < cm.state.keyMaps.length; i++) {
	var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
	if (result) return result;
	}
	return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
	\|\| lookupKey(name, cm.options.keyMap, handle, cm);
	}

	var stopSeq = new Delayed;
	function dispatchKey(cm, name, e, handle) {
	var seq = cm.state.keySeq;
	if (seq) {
	if (isModifierKey(name)) return "handled";
	stopSeq.set(50, function() {
	if (cm.state.keySeq == seq) {
	cm.state.keySeq = null;
	cm.display.input.reset();
	}
	});
	name = seq + " " + name;
	}
	var result = lookupKeyForEditor(cm, name, handle);

	if (result == "multi")
	cm.state.keySeq = name;
	if (result == "handled")
	signalLater(cm, "keyHandled", cm, name, e);

	if (result == "handled" \|\| result == "multi") {
	e_preventDefault(e);
	restartBlink(cm);
	}

	if (seq && !result && /\'$/.test(name)) {
	e_preventDefault(e);
	return true;
	}
	return !!result;
	}

	// Handle a key from the keydown event.
	function handleKeyBinding(cm, e) {
	var name = keyName(e, true);
	if (!name) return false;

	if (e.shiftKey && !cm.state.keySeq) {
	// 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-'.
	return dispatchKey(cm, "Shift-" + name, e, function(b) {return doHandleBinding(cm, b, true);})
	\|\| dispatchKey(cm, name, e, function(b) {
	if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
	return doHandleBinding(cm, b);
	});
	} else {
	return dispatchKey(cm, name, e, function(b) { return doHandleBinding(cm, b); });
	}
	}

	// Handle a key from the keypress event
	function handleCharBinding(cm, e, ch) {
	return dispatchKey(cm, "'" + ch + "'", e,
	function(b) { return doHandleBinding(cm, b, true); });
	}

	var lastStoppedKey = null;
	function onKeyDown(e) {
	var cm = this;
	cm.curOp.focus = activeElt();
	if (signalDOMEvent(cm, e)) return;
	// IE does strange things with escape.
	if (ie && ie_version < 11 && e.keyCode == 27) e.returnValue = false;
	var code = e.keyCode;
	cm.display.shift = code == 16 \|\| e.shiftKey;
	var handled = handleKeyBinding(cm, e);
	if (presto) {
	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("", null, "cut");
	}

	// Turn mouse into crosshair when Alt is held on Mac.
	if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
	showCrossHair(cm);
	}

	function showCrossHair(cm) {
	var lineDiv = cm.display.lineDiv;
	addClass(lineDiv, "CodeMirror-crosshair");

	function up(e) {
	if (e.keyCode == 18 \|\| !e.altKey) {
	rmClass(lineDiv, "CodeMirror-crosshair");
	off(document, "keyup", up);
	off(document, "mouseover", up);
	}
	}
	on(document, "keyup", up);
	on(document, "mouseover", up);
	}

	function onKeyUp(e) {
	if (e.keyCode == 16) this.doc.sel.shift = false;
	signalDOMEvent(this, e);
	}

	function onKeyPress(e) {
	var cm = this;
	if (eventInWidget(cm.display, e) \|\| signalDOMEvent(cm, e) \|\| e.ctrlKey && !e.altKey \|\| mac && e.metaKey) return;
	var keyCode = e.keyCode, charCode = e.charCode;
	if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
	if ((presto && (!e.which \|\| e.which < 10)) && handleKeyBinding(cm, e)) return;
	var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
	if (handleCharBinding(cm, e, ch)) return;
	cm.display.input.onKeyPress(e);
	}

	// FOCUS/BLUR EVENTS

	function delayBlurEvent(cm) {
	cm.state.delayingBlurEvent = true;
	setTimeout(function() {
	if (cm.state.delayingBlurEvent) {
	cm.state.delayingBlurEvent = false;
	onBlur(cm);
	}
	}, 100);
	}

	function onFocus(cm) {
	if (cm.state.delayingBlurEvent) cm.state.delayingBlurEvent = false;

	if (cm.options.readOnly == "nocursor") return;
	if (!cm.state.focused) {
	signal(cm, "focus", cm);
	cm.state.focused = true;
	addClass(cm.display.wrapper, "CodeMirror-focused");
	// This test prevents this from firing when a context
	// menu is closed (since the input reset would kill the
	// select-all detection hack)
	if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
	cm.display.input.reset();
	if (webkit) setTimeout(function() { cm.display.input.reset(true); }, 20); // Issue #1730
	}
	cm.display.input.receivedFocus();
	}
	restartBlink(cm);
	}
	function onBlur(cm) {
	if (cm.state.delayingBlurEvent) return;

	if (cm.state.focused) {
	signal(cm, "blur", cm);
	cm.state.focused = false;
	rmClass(cm.display.wrapper, "CodeMirror-focused");
	}
	clearInterval(cm.display.blinker);
	setTimeout(function() {if (!cm.state.focused) cm.display.shift = false;}, 150);
	}

	// CONTEXT MENU HANDLING

	// To make the context menu work, we need to briefly unhide the
	// textarea (making it as unobtrusive as possible) to let the
	// right-click take effect on it.
	function onContextMenu(cm, e) {
	if (eventInWidget(cm.display, e) \|\| contextMenuInGutter(cm, e)) return;
	cm.display.input.onContextMenu(e);
	}

	function contextMenuInGutter(cm, e) {
	if (!hasHandler(cm, "gutterContextMenu")) return false;
	return gutterEvent(cm, e, "gutterContextMenu", false, signal);
	}

	// UPDATING

	// Compute the position of the end of a change (its 'to' property
	// refers to the pre-change end).
	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));
	};

	// Adjust a position to refer to the post-change position of the
	// same text, or the end of the change if the change covers it.
	function adjustForChange(pos, change) {
	if (cmp(pos, change.from) < 0) return pos;
	if (cmp(pos, change.to) <= 0) return changeEnd(change);

	var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
	if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch;
	return Pos(line, ch);
	}

	function computeSelAfterChange(doc, change) {
	var out = [];
	for (var i = 0; i < doc.sel.ranges.length; i++) {
	var range = doc.sel.ranges[i];
	out.push(new Range(adjustForChange(range.anchor, change),
	adjustForChange(range.head, change)));
	}
	return normalizeSelection(out, doc.sel.primIndex);
	}

	function offsetPos(pos, old, nw) {
	if (pos.line == old.line)
	return Pos(nw.line, pos.ch - old.ch + nw.ch);
	else
	return Pos(nw.line + (pos.line - old.line), pos.ch);
	}

	// Used by replaceSelections to allow moving the selection to the
	// start or around the replaced test. Hint may be "start" or "around".
	function computeReplacedSel(doc, changes, hint) {
	var out = [];
	var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
	for (var i = 0; i < changes.length; i++) {
	var change = changes[i];
	var from = offsetPos(change.from, oldPrev, newPrev);
	var to = offsetPos(changeEnd(change), oldPrev, newPrev);
	oldPrev = change.to;
	newPrev = to;
	if (hint == "around") {
	var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
	out[i] = new Range(inv ? to : from, inv ? from : to);
	} else {
	out[i] = new Range(from, from);
	}
	}
	return new Selection(out, doc.sel.primIndex);
	}

	// Allow "beforeChange" event handlers to influence a change
	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};
	}

	// Apply a change to a document, and add it to the document's
	// history, and propagating it to all linked documents.
	function makeChange(doc, change, ignoreReadOnly) {
	if (doc.cm) {
	if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, 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 >= 0; --i)
	makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text});
	} else {
	makeChangeInner(doc, change);
	}
	}

	function makeChangeInner(doc, change) {
	if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) return;
	var selAfter = computeSelAfterChange(doc, change);
	addChangeToHistory(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));
	});
	}

	// Revert a change stored in a document's history.
	function makeChangeFromHistory(doc, type, allowSelectionOnly) {
	if (doc.cm && doc.cm.state.suppressEdits) return;

	var hist = doc.history, event, selAfter = doc.sel;
	var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;

	// Verify that there is a useable event (so that ctrl-z won't
	// needlessly clear selection events)
	for (var i = 0; i < source.length; i++) {
	event = source[i];
	if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
	break;
	}
	if (i == source.length) return;
	hist.lastOrigin = hist.lastSelOrigin = null;

	for (;;) {
	event = source.pop();
	if (event.ranges) {
	pushSelectionToHistory(event, dest);
	if (allowSelectionOnly && !event.equals(doc.sel)) {
	setSelection(doc, event, {clearRedo: false});
	return;
	}
	selAfter = event;
	}
	else break;
	}

	// Build up a reverse change object to add to the opposite history
	// stack (redo when undoing, and vice versa).
	var antiChanges = [];
	pushSelectionToHistory(selAfter, dest);
	dest.push({changes: antiChanges, generation: hist.generation});
	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)) {
	source.length = 0;
	return;
	}

	antiChanges.push(historyChangeFromChange(doc, change));

	var after = i ? computeSelAfterChange(doc, change) : lst(source);
	makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
	if (!i && doc.cm) doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)});
	var rebased = [];

	// Propagate to the linked documents
	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));
	});
	}
	}

	// Sub-views need their line numbers shifted when text is added
	// above or below them in the parent document.
	function shiftDoc(doc, distance) {
	if (distance == 0) return;
	doc.first += distance;
	doc.sel = new Selection(map(doc.sel.ranges, function(range) {
	return new Range(Pos(range.anchor.line + distance, range.anchor.ch),
	Pos(range.head.line + distance, range.head.ch));
	}), doc.sel.primIndex);
	if (doc.cm) {
	regChange(doc.cm, doc.first, doc.first - distance, distance);
	for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
	regLineChange(doc.cm, l, "gutter");
	}
	}

	// More lower-level change function, handling only a single document
	// (not linked ones).
	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);
	if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans);
	else updateDoc(doc, change, spans);
	setSelectionNoUndo(doc, selAfter, sel_dontScroll);
	}

	// Handle the interaction of a change to a document with the editor
	// that this document is part of.
	function makeChangeSingleDocInEditor(cm, change, spans) {
	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(getLine(doc, from.line)));
	doc.iter(checkWidthStart, to.line + 1, function(line) {
	if (line == display.maxLine) {
	recomputeMaxLength = true;
	return true;
	}
	});
	}

	if (doc.sel.contains(change.from, change.to) > -1)
	signalCursorActivity(cm);

	updateDoc(doc, change, spans, estimateHeight(cm));

	if (!cm.options.lineWrapping) {
	doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
	var len = lineLength(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
	if (change.full)
	regChange(cm);
	else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
	regLineChange(cm, from.line, "text");
	else
	regChange(cm, from.line, to.line + 1, lendiff);

	var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
	if (changeHandler \|\| changesHandler) {
	var obj = {
	from: from, to: to,
	text: change.text,
	removed: change.removed,
	origin: change.origin
	};
	if (changeHandler) signalLater(cm, "change", cm, obj);
	if (changesHandler) (cm.curOp.changeObjs \|\| (cm.curOp.changeObjs = [])).push(obj);
	}
	cm.display.selForContextMenu = null;
	}

	function replaceRange(doc, code, from, to, origin) {
	if (!to) to = from;
	if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp; }
	if (typeof code == "string") code = doc.splitLines(code);
	makeChange(doc, {from: from, to: to, text: code, origin: origin});
	}

	// SCROLLING THINGS INTO VIEW

	// If an editor sits on the top or bottom of the window, partially
	// scrolled out of view, this ensures that the cursor is visible.
	function maybeScrollWindow(cm, coords) {
	if (signalDOMEvent(cm, "scrollCursorIntoView")) return;

	var display = cm.display, box = display.sizer.getBoundingClientRect(), 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 scrollNode = elt("div", "\u200b", null, "position: absolute; top: " +
	(coords.top - display.viewOffset - paddingTop(cm.display)) + "px; height: " +
	(coords.bottom - coords.top + scrollGap(cm) + display.barHeight) + "px; left: " +
	coords.left + "px; width: 2px;");
	cm.display.lineSpace.appendChild(scrollNode);
	scrollNode.scrollIntoView(doScroll);
	cm.display.lineSpace.removeChild(scrollNode);
	}
	}

	// Scroll a given position into view (immediately), verifying that
	// it actually became visible (as line heights are accurately
	// measured, the position of something may 'drift' during drawing).
	function scrollPosIntoView(cm, pos, end, margin) {
	if (margin == null) margin = 0;
	for (var limit = 0; limit < 5; limit++) {
	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) break;
	}
	return coords;
	}

	// Scroll a given set of coordinates into view (immediately).
	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);
	}

	// Calculate a new scroll position needed to scroll the given
	// rectangle into view. Returns an object with scrollTop and
	// scrollLeft properties. When these are undefined, the
	// vertical/horizontal position does not need to be adjusted.
	function calculateScrollPos(cm, x1, y1, x2, y2) {
	var display = cm.display, snapMargin = textHeight(cm.display);
	if (y1 < 0) y1 = 0;
	var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
	var screen = displayHeight(cm), result = {};
	if (y2 - y1 > screen) y2 = y1 + screen;
	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 screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
	var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
	var tooWide = x2 - x1 > screenw;
	if (tooWide) x2 = x1 + screenw;
	if (x1 < 10)
	result.scrollLeft = 0;
	else if (x1 < screenleft)
	result.scrollLeft = Math.max(0, x1 - (tooWide ? 0 : 10));
	else if (x2 > screenw + screenleft - 3)
	result.scrollLeft = x2 + (tooWide ? 0 : 10) - screenw;
	return result;
	}

	// Store a relative adjustment to the scroll position in the current
	// operation (to be applied when the operation finishes).
	function addToScrollPos(cm, left, top) {
	if (left != null \|\| top != null) resolveScrollToPos(cm);
	if (left != null)
	cm.curOp.scrollLeft = (cm.curOp.scrollLeft == null ? cm.doc.scrollLeft : cm.curOp.scrollLeft) + left;
	if (top != null)
	cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
	}

	// Make sure that at the end of the operation the current cursor is
	// shown.
	function ensureCursorVisible(cm) {
	resolveScrollToPos(cm);
	var cur = cm.getCursor(), from = cur, to = cur;
	if (!cm.options.lineWrapping) {
	from = cur.ch ? Pos(cur.line, cur.ch - 1) : cur;
	to = Pos(cur.line, cur.ch + 1);
	}
	cm.curOp.scrollToPos = {from: from, to: to, margin: cm.options.cursorScrollMargin, isCursor: true};
	}

	// When an operation has its scrollToPos property set, and another
	// scroll action is applied before the end of the operation, this
	// 'simulates' scrolling that position into view in a cheap way, so
	// that the effect of intermediate scroll commands is not ignored.
	function resolveScrollToPos(cm) {
	var range = cm.curOp.scrollToPos;
	if (range) {
	cm.curOp.scrollToPos = null;
	var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
	var sPos = calculateScrollPos(cm, Math.min(from.left, to.left),
	Math.min(from.top, to.top) - range.margin,
	Math.max(from.right, to.right),
	Math.max(from.bottom, to.bottom) + range.margin);
	cm.scrollTo(sPos.scrollLeft, sPos.scrollTop);
	}
	}

	// API UTILITIES

	// Indent the given line. The how parameter can be "smart",
	// "add"/null, "subtract", or "prev". When aggressive is false
	// (typically set to true for forced single-line indents), empty
	// lines are not indented, and places where the mode returns Pass
	// are left alone.
	function indentLine(cm, n, how, aggressive) {
	var doc = cm.doc, state;
	if (how == null) how = "add";
	if (how == "smart") {
	// Fall back to "prev" when the mode doesn't have an indentation
	// method.
	if (!doc.mode.indent) how = "prev";
	else state = getStateBefore(cm, n);
	}

	var tabSize = cm.options.tabSize;
	var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
	if (line.stateAfter) line.stateAfter = null;
	var curSpaceString = line.text.match(/^\s*/)[0], indentation;
	if (!aggressive && !/\S/.test(line.text)) {
	indentation = 0;
	how = "not";
	} else if (how == "smart") {
	indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
	if (indentation == Pass \|\| indentation > 150) {
	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(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
	line.stateAfter = null;
	return true;
	} else {
	// Ensure that, if the cursor was in the whitespace at the start
	// of the line, it is moved to the end of that space.
	for (var i = 0; i < doc.sel.ranges.length; i++) {
	var range = doc.sel.ranges[i];
	if (range.head.line == n && range.head.ch < curSpaceString.length) {
	var pos = Pos(n, curSpaceString.length);
	replaceOneSelection(doc, i, new Range(pos, pos));
	break;
	}
	}
	}
	}

	// Utility for applying a change to a line by handle or number,
	// returning the number and optionally registering the line as
	// changed.
	function changeLine(doc, handle, changeType, op) {
	var no = handle, line = handle;
	if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
	else no = lineNo(handle);
	if (no == null) return null;
	if (op(line, no) && doc.cm) regLineChange(doc.cm, no, changeType);
	return line;
	}

	// Helper for deleting text near the selection(s), used to implement
	// backspace, delete, and similar functionality.
	function deleteNearSelection(cm, compute) {
	var ranges = cm.doc.sel.ranges, kill = [];
	// Build up a set of ranges to kill first, merging overlapping
	// ranges.
	for (var i = 0; i < ranges.length; i++) {
	var toKill = compute(ranges[i]);
	while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
	var replaced = kill.pop();
	if (cmp(replaced.from, toKill.from) < 0) {
	toKill.from = replaced.from;
	break;
	}
	}
	kill.push(toKill);
	}
	// Next, remove those actual ranges.
	runInOp(cm, function() {
	for (var i = kill.length - 1; i >= 0; i--)
	replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
	ensureCursorVisible(cm);
	});
	}

	// Used for horizontal relative motion. Dir is -1 or 1 (left or
	// right), unit can be "char", "column" (like char, but doesn't
	// cross line boundaries), "word" (across next word), or "group" (to
	// the start of next group of word or non-word-non-whitespace
	// chars). The visually param controls whether, in right-to-left
	// text, direction 1 means to move towards the next index in the
	// string, or towards the character to the right of the current
	// position. The resulting position will have a hitSide=true
	// property if it reached the end of the document.
	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";
	var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
	for (var first = true;; first = false) {
	if (dir < 0 && !moveOnce(!first)) break;
	var cur = lineObj.text.charAt(ch) \|\| "\n";
	var type = isWordChar(cur, helper) ? "w"
	: group && cur == "\n" ? "n"
	: !group \|\| /\s/.test(cur) ? null
	: "p";
	if (group && !first && !type) type = "s";
	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;
	}

	// For relative vertical movement. Dir may be -1 or 1. Unit can be
	// "page" or "line". The resulting position will have a hitSide=true
	// property if it reached the end of the document.
	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;
	}

	// EDITOR METHODS

	// The publicly visible API. Note that methodOp(f) means
	// 'wrap f in an operation, performed on its `this` parameter'.

	// This is not the complete set of editor methods. Most of the
	// methods defined on the Doc type are also injected into
	// CodeMirror.prototype, for backwards compatibility and
	// convenience.

	CodeMirror.prototype = {
	constructor: CodeMirror,
	focus: function(){window.focus(); this.display.input.focus();},

	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"](getKeyMap(map));
	},
	removeKeyMap: function(map) {
	var maps = this.state.keyMaps;
	for (var i = 0; i < maps.length; ++i)
	if (maps[i] == map \|\| maps[i].name == map) {
	maps.splice(i, 1);
	return true;
	}
	},

	addOverlay: methodOp(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: methodOp(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: methodOp(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: methodOp(function(how) {
	var ranges = this.doc.sel.ranges, end = -1;
	for (var i = 0; i < ranges.length; i++) {
	var range = ranges[i];
	if (!range.empty()) {
	var from = range.from(), to = range.to();
	var start = Math.max(end, from.line);
	end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
	for (var j = start; j < end; ++j)
	indentLine(this, j, how);
	var newRanges = this.doc.sel.ranges;
	if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
	replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
	} else if (range.head.line > end) {
	indentLine(this, range.head.line, how, true);
	end = range.head.line;
	if (i == this.doc.sel.primIndex) ensureCursorVisible(this);
	}
	}
	}),

	// 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) {
	return takeToken(this, pos, precise);
	},

	getLineTokens: function(line, precise) {
	return takeToken(this, Pos(line), precise, true);
	},

	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;
	var type;
	if (ch == 0) type = styles[2];
	else 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 { type = styles[mid * 2 + 2]; break; }
	}
	var cut = type ? type.indexOf("cm-overlay ") : -1;
	return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1);
	},

	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) {
	return this.getHelpers(pos, type)[0];
	},

	getHelpers: function(pos, type) {
	var found = [];
	if (!helpers.hasOwnProperty(type)) return found;
	var help = helpers[type], mode = this.getModeAt(pos);
	if (typeof mode[type] == "string") {
	if (help[mode[type]]) found.push(help[mode[type]]);
	} else if (mode[type]) {
	for (var i = 0; i < mode[type].length; i++) {
	var val = help[mode[type][i]];
	if (val) found.push(val);
	}
	} else if (mode.helperType && help[mode.helperType]) {
	found.push(help[mode.helperType]);
	} else if (help[mode.name]) {
	found.push(help[mode.name]);
	}
	for (var i = 0; i < help._global.length; i++) {
	var cur = help._global[i];
	if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
	found.push(cur.val);
	}
	return found;
	},

	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, range = this.doc.sel.primary();
	if (start == null) pos = range.head;
	else if (typeof start == "object") pos = clipPos(this.doc, start);
	else pos = start ? range.from() : range.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, lineObj;
	if (typeof line == "number") {
	var 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; }
	lineObj = getLine(this.doc, line);
	} else {
	lineObj = line;
	}
	return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode \|\| "page").top +
	(end ? this.doc.height - heightAtLine(lineObj) : 0);
	},

	defaultTextHeight: function() { return textHeight(this.display); },
	defaultCharWidth: function() { return charWidth(this.display); },

	setGutterMarker: methodOp(function(line, gutterID, value) {
	return changeLine(this.doc, line, "gutter", function(line) {
	var markers = line.gutterMarkers \|\| (line.gutterMarkers = {});
	markers[gutterID] = value;
	if (!value && isEmpty(markers)) line.gutterMarkers = null;
	return true;
	});
	}),

	clearGutter: methodOp(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;
	regLineChange(cm, i, "gutter");
	if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
	}
	++i;
	});
	}),

	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.viewFrom, to: this.display.viewTo};},

	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";
	node.setAttribute("cm-ignore-events", "true");
	this.display.input.setUneditable(node);
	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: methodOp(onKeyDown),
	triggerOnKeyPress: methodOp(onKeyPress),
	triggerOnKeyUp: onKeyUp,

	execCommand: function(cmd) {
	if (commands.hasOwnProperty(cmd))
	return commands[cmd].call(null, this);
	},

	triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),

	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: methodOp(function(dir, unit) {
	var cm = this;
	cm.extendSelectionsBy(function(range) {
	if (cm.display.shift \|\| cm.doc.extend \|\| range.empty())
	return findPosH(cm.doc, range.head, dir, unit, cm.options.rtlMoveVisually);
	else
	return dir < 0 ? range.from() : range.to();
	}, sel_move);
	}),

	deleteH: methodOp(function(dir, unit) {
	var sel = this.doc.sel, doc = this.doc;
	if (sel.somethingSelected())
	doc.replaceSelection("", null, "+delete");
	else
	deleteNearSelection(this, function(range) {
	var other = findPosH(doc, range.head, dir, unit, false);
	return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other};
	});
	}),

	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: methodOp(function(dir, unit) {
	var cm = this, doc = this.doc, goals = [];
	var collapse = !cm.display.shift && !doc.extend && doc.sel.somethingSelected();
	doc.extendSelectionsBy(function(range) {
	if (collapse)
	return dir < 0 ? range.from() : range.to();
	var headPos = cursorCoords(cm, range.head, "div");
	if (range.goalColumn != null) headPos.left = range.goalColumn;
	goals.push(headPos.left);
	var pos = findPosV(cm, headPos, dir, unit);
	if (unit == "page" && range == doc.sel.primary())
	addToScrollPos(cm, null, charCoords(cm, pos, "div").top - headPos.top);
	return pos;
	}, sel_move);
	if (goals.length) for (var i = 0; i < doc.sel.ranges.length; i++)
	doc.sel.ranges[i].goalColumn = goals[i];
	}),

	// Find the word at the given position (as returned by coordsChar).
	findWordAt: function(pos) {
	var doc = this.doc, line = getLine(doc, pos.line).text;
	var start = pos.ch, end = pos.ch;
	if (line) {
	var helper = this.getHelper(pos, "wordChars");
	if ((pos.xRel < 0 \|\| end == line.length) && start) --start; else ++end;
	var startChar = line.charAt(start);
	var check = isWordChar(startChar, helper)
	? function(ch) { return isWordChar(ch, helper); }
	: /\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 new Range(Pos(pos.line, start), Pos(pos.line, end));
	},

	toggleOverwrite: function(value) {
	if (value != null && value == this.state.overwrite) return;
	if (this.state.overwrite = !this.state.overwrite)
	addClass(this.display.cursorDiv, "CodeMirror-overwrite");
	else
	rmClass(this.display.cursorDiv, "CodeMirror-overwrite");

	signal(this, "overwriteToggle", this, this.state.overwrite);
	},
	hasFocus: function() { return this.display.input.getField() == activeElt(); },

	scrollTo: methodOp(function(x, y) {
	if (x != null \|\| y != null) resolveScrollToPos(this);
	if (x != null) this.curOp.scrollLeft = x;
	if (y != null) this.curOp.scrollTop = y;
	}),
	getScrollInfo: function() {
	var scroller = this.display.scroller;
	return {left: scroller.scrollLeft, top: scroller.scrollTop,
	height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
	width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
	clientHeight: displayHeight(this), clientWidth: displayWidth(this)};
	},

	scrollIntoView: methodOp(function(range, margin) {
	if (range == null) {
	range = {from: this.doc.sel.primary().head, to: null};
	if (margin == null) margin = this.options.cursorScrollMargin;
	} 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;
	range.margin = margin \|\| 0;

	if (range.from.line != null) {
	resolveScrollToPos(this);
	this.curOp.scrollToPos = range;
	} else {
	var sPos = calculateScrollPos(this, Math.min(range.from.left, range.to.left),
	Math.min(range.from.top, range.to.top) - range.margin,
	Math.max(range.from.right, range.to.right),
	Math.max(range.from.bottom, range.to.bottom) + range.margin);
	this.scrollTo(sPos.scrollLeft, sPos.scrollTop);
	}
	}),

	setSize: methodOp(function(width, height) {
	var cm = this;
	function interpret(val) {
	return typeof val == "number" \|\| /^\d+$/.test(String(val)) ? val + "px" : val;
	}
	if (width != null) cm.display.wrapper.style.width = interpret(width);
	if (height != null) cm.display.wrapper.style.height = interpret(height);
	if (cm.options.lineWrapping) clearLineMeasurementCache(this);
	var lineNo = cm.display.viewFrom;
	cm.doc.iter(lineNo, cm.display.viewTo, function(line) {
	if (line.widgets) for (var i = 0; i < line.widgets.length; i++)
	if (line.widgets[i].noHScroll) { regLineChange(cm, lineNo, "widget"); break; }
	++lineNo;
	});
	cm.curOp.forceUpdate = true;
	signal(cm, "refresh", this);
	}),

	operation: function(f){return runInOp(this, f);},

	refresh: methodOp(function() {
	var oldHeight = this.display.cachedTextHeight;
	regChange(this);
	this.curOp.forceUpdate = true;
	clearCaches(this);
	this.scrollTo(this.doc.scrollLeft, this.doc.scrollTop);
	updateGutterSpace(this);
	if (oldHeight == null \|\| Math.abs(oldHeight - textHeight(this.display)) > .5)
	estimateLineHeights(this);
	signal(this, "refresh", this);
	}),

	swapDoc: methodOp(function(doc) {
	var old = this.doc;
	old.cm = null;
	attachDoc(this, doc);
	clearCaches(this);
	this.display.input.reset();
	this.scrollTo(doc.scrollLeft, doc.scrollTop);
	this.curOp.forceScroll = true;
	signalLater(this, "swapDoc", this, old);
	return old;
	}),

	getInputField: function(){return this.display.input.getField();},
	getWrapperElement: function(){return this.display.wrapper;},
	getScrollerElement: function(){return this.display.scroller;},
	getGutterElement: function(){return this.display.gutters;}
	};
	eventMixin(CodeMirror);

	// OPTION DEFAULTS

	// The default configuration options.
	var defaults = CodeMirror.defaults = {};
	// Functions to run when options are changed.
	var optionHandlers = CodeMirror.optionHandlers = {};

	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;
	}

	// Passed to option handlers when there is no old value.
	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) {
	resetModeState(cm);
	clearCaches(cm);
	regChange(cm);
	}, true);
	option("lineSeparator", null, function(cm, val) {
	cm.doc.lineSep = val;
	if (!val) return;
	var newBreaks = [], lineNo = cm.doc.first;
	cm.doc.iter(function(line) {
	for (var pos = 0;;) {
	var found = line.text.indexOf(val, pos);
	if (found == -1) break;
	pos = found + val.length;
	newBreaks.push(Pos(lineNo, found));
	}
	lineNo++;
	});
	for (var i = newBreaks.length - 1; i >= 0; i--)
	replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length))
	});
	option("specialChars", /[\t\u0000-\u0019\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val, old) {
	cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "\|\t"), "g");
	if (old != CodeMirror.Init) cm.refresh();
	});
	option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {cm.refresh();}, true);
	option("electricChars", true);
	option("inputStyle", mobile ? "contenteditable" : "textarea", function() {
	throw new Error("inputStyle can not (yet) be changed in a running editor"); // FIXME
	}, true);
	option("rtlMoveVisually", !windows);
	option("wholeLineUpdateBefore", true);

	option("theme", "default", function(cm) {
	themeChanged(cm);
	guttersChanged(cm);
	}, true);
	option("keyMap", "default", function(cm, val, old) {
	var next = getKeyMap(val);
	var prev = old != CodeMirror.Init && getKeyMap(old);
	if (prev && prev.detach) prev.detach(cm, next);
	if (next.attach) next.attach(cm, prev \|\| null);
	});
	option("extraKeys", 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, function(cm) {updateScrollbars(cm);}, true);
	option("scrollbarStyle", "native", function(cm) {
	initScrollbars(cm);
	updateScrollbars(cm);
	cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
	cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
	}, 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("lineWiseCopyCut", true);

	option("readOnly", false, function(cm, val) {
	if (val == "nocursor") {
	onBlur(cm);
	cm.display.input.blur();
	cm.display.disabled = true;
	} else {
	cm.display.disabled = false;
	if (!val) cm.display.input.reset();
	}
	});
	option("disableInput", false, function(cm, val) {if (!val) cm.display.input.reset();}, true);
	option("dragDrop", true, dragDropChanged);

	option("cursorBlinkRate", 530);
	option("cursorScrollMargin", 0);
	option("cursorHeight", 1, updateSelection, true);
	option("singleCursorHeightPerLine", true, updateSelection, true);
	option("workTime", 100);
	option("workDelay", 100);
	option("flattenSpans", true, resetModeState, true);
	option("addModeClass", false, resetModeState, true);
	option("pollInterval", 100);
	option("undoDepth", 200, function(cm, val){cm.doc.history.undoDepth = val;});
	option("historyEventDelay", 1250);
	option("viewportMargin", 10, function(cm){cm.refresh();}, true);
	option("maxHighlightLength", 10000, resetModeState, true);
	option("moveInputWithCursor", true, function(cm, val) {
	if (!val) cm.display.input.resetPosition();
	});

	option("tabindex", null, function(cm, val) {
	cm.display.input.getField().tabIndex = val \|\| "";
	});
	option("autofocus", null);

	// MODE DEFINITION AND QUERYING

	// Known modes, by name and by MIME
	var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};

	// Extra arguments are stored as the mode's dependencies, which is
	// used by (legacy) mechanisms like loadmode.js to automatically
	// load a mode. (Preferred mechanism is the require/define calls.)
	CodeMirror.defineMode = function(name, mode) {
	if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
	if (arguments.length > 2)
	mode.dependencies = Array.prototype.slice.call(arguments, 2);
	modes[name] = mode;
	};

	CodeMirror.defineMIME = function(mime, spec) {
	mimeModes[mime] = spec;
	};

	// Given a MIME type, a {name, ...options} config object, or a name
	// string, return a mode config object.
	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];
	if (typeof found == "string") found = {name: found};
	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"};
	};

	// Given a mode spec (anything that resolveMode accepts), find and
	// initialize an actual mode object.
	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;
	if (spec.helperType) modeObj.helperType = spec.helperType;
	if (spec.modeProps) for (var prop in spec.modeProps)
	modeObj[prop] = spec.modeProps[prop];

	return modeObj;
	};

	// Minimal default mode.
	CodeMirror.defineMode("null", function() {
	return {token: function(stream) {stream.skipToEnd();}};
	});
	CodeMirror.defineMIME("text/plain", "null");

	// This can be used to attach properties to mode objects from
	// outside the actual mode definition.
	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] = {_global: []};
	helpers[type][name] = value;
	};
	CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
	CodeMirror.registerHelper(type, name, value);
	helpers[type]._global.push({pred: predicate, val: value});
	};

	// MODE STATE HANDLING

	// Utility functions for working with state. Exported because nested
	// modes need to do this for their inner modes.

	var copyState = CodeMirror.copyState = function(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;
	};

	var startState = CodeMirror.startState = function(mode, a1, a2) {
	return mode.startState ? mode.startState(a1, a2) : true;
	};

	// Given a mode and a state (for that mode), find the inner mode and
	// state at the position that the state refers to.
	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

	// Commands are parameter-less actions that can be performed on an
	// editor, mostly used for keybindings.
	var commands = CodeMirror.commands = {
	selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);},
	singleSelection: function(cm) {
	cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
	},
	killLine: function(cm) {
	deleteNearSelection(cm, function(range) {
	if (range.empty()) {
	var len = getLine(cm.doc, range.head.line).text.length;
	if (range.head.ch == len && range.head.line < cm.lastLine())
	return {from: range.head, to: Pos(range.head.line + 1, 0)};
	else
	return {from: range.head, to: Pos(range.head.line, len)};
	} else {
	return {from: range.from(), to: range.to()};
	}
	});
	},
	deleteLine: function(cm) {
	deleteNearSelection(cm, function(range) {
	return {from: Pos(range.from().line, 0),
	to: clipPos(cm.doc, Pos(range.to().line + 1, 0))};
	});
	},
	delLineLeft: function(cm) {
	deleteNearSelection(cm, function(range) {
	return {from: Pos(range.from().line, 0), to: range.from()};
	});
	},
	delWrappedLineLeft: function(cm) {
	deleteNearSelection(cm, function(range) {
	var top = cm.charCoords(range.head, "div").top + 5;
	var leftPos = cm.coordsChar({left: 0, top: top}, "div");
	return {from: leftPos, to: range.from()};
	});
	},
	delWrappedLineRight: function(cm) {
	deleteNearSelection(cm, function(range) {
	var top = cm.charCoords(range.head, "div").top + 5;
	var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
	return {from: range.from(), to: rightPos };
	});
	},
	undo: function(cm) {cm.undo();},
	redo: function(cm) {cm.redo();},
	undoSelection: function(cm) {cm.undoSelection();},
	redoSelection: function(cm) {cm.redoSelection();},
	goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
	goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
	goLineStart: function(cm) {
	cm.extendSelectionsBy(function(range) { return lineStart(cm, range.head.line); },
	{origin: "+move", bias: 1});
	},
	goLineStartSmart: function(cm) {
	cm.extendSelectionsBy(function(range) {
	return lineStartSmart(cm, range.head);
	}, {origin: "+move", bias: 1});
	},
	goLineEnd: function(cm) {
	cm.extendSelectionsBy(function(range) { return lineEnd(cm, range.head.line); },
	{origin: "+move", bias: -1});
	},
	goLineRight: function(cm) {
	cm.extendSelectionsBy(function(range) {
	var top = cm.charCoords(range.head, "div").top + 5;
	return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
	}, sel_move);
	},
	goLineLeft: function(cm) {
	cm.extendSelectionsBy(function(range) {
	var top = cm.charCoords(range.head, "div").top + 5;
	return cm.coordsChar({left: 0, top: top}, "div");
	}, sel_move);
	},
	goLineLeftSmart: function(cm) {
	cm.extendSelectionsBy(function(range) {
	var top = cm.charCoords(range.head, "div").top + 5;
	var pos = cm.coordsChar({left: 0, top: top}, "div");
	if (pos.ch < cm.getLine(pos.line).search(/\S/)) return lineStartSmart(cm, range.head);
	return pos;
	}, sel_move);
	},
	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");},
	insertSoftTab: function(cm) {
	var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
	for (var i = 0; i < ranges.length; i++) {
	var pos = ranges[i].from();
	var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
	spaces.push(new Array(tabSize - col % tabSize + 1).join(" "));
	}
	cm.replaceSelections(spaces);
	},
	defaultTab: function(cm) {
	if (cm.somethingSelected()) cm.indentSelection("add");
	else cm.execCommand("insertTab");
	},
	transposeChars: function(cm) {
	runInOp(cm, function() {
	var ranges = cm.listSelections(), newSel = [];
	for (var i = 0; i < ranges.length; i++) {
	var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
	if (line) {
	if (cur.ch == line.length) cur = new Pos(cur.line, cur.ch - 1);
	if (cur.ch > 0) {
	cur = new Pos(cur.line, cur.ch + 1);
	cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
	Pos(cur.line, cur.ch - 2), cur, "+transpose");
	} else if (cur.line > cm.doc.first) {
	var prev = getLine(cm.doc, cur.line - 1).text;
	if (prev)
	cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
	prev.charAt(prev.length - 1),
	Pos(cur.line - 1, prev.length - 1), Pos(cur.line, 1), "+transpose");
	}
	}
	newSel.push(new Range(cur, cur));
	}
	cm.setSelections(newSel);
	});
	},
	newlineAndIndent: function(cm) {
	runInOp(cm, function() {
	var len = cm.listSelections().length;
	for (var i = 0; i < len; i++) {
	var range = cm.listSelections()[i];
	cm.replaceRange(cm.doc.lineSeparator(), range.anchor, range.head, "+input");
	cm.indentLine(range.from().line + 1, null, true);
	ensureCursorVisible(cm);
	}
	});
	},
	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",
	"Esc": "singleSelection"
	};
	// Note that the save and find-related commands aren't defined by
	// default. User code or addons can define them. 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", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
	"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",
	"Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
	fallthrough: "basic"
	};
	// Very basic readline/emacs-style bindings, which are standard on Mac.
	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.macDefault = {
	"Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
	"Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
	"Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "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": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
	"Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
	fallthrough: ["basic", "emacsy"]
	};
	keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

	// KEYMAP DISPATCH

	function normalizeKeyName(name) {
	var parts = name.split(/-(?!$)/), name = parts[parts.length - 1];
	var alt, ctrl, shift, cmd;
	for (var i = 0; i < parts.length - 1; i++) {
	var mod = parts[i];
	if (/^(cmd\|meta\|m)$/i.test(mod)) cmd = true;
	else if (/^a(lt)?$/i.test(mod)) alt = true;
	else if (/^(c\|ctrl\|control)$/i.test(mod)) ctrl = true;
	else if (/^s(hift)$/i.test(mod)) shift = true;
	else throw new Error("Unrecognized modifier name: " + mod);
	}
	if (alt) name = "Alt-" + name;
	if (ctrl) name = "Ctrl-" + name;
	if (cmd) name = "Cmd-" + name;
	if (shift) name = "Shift-" + name;
	return name;
	}

	// This is a kludge to keep keymaps mostly working as raw objects
	// (backwards compatibility) while at the same time support features
	// like normalization and multi-stroke key bindings. It compiles a
	// new normalized keymap, and then updates the old object to reflect
	// this.
	CodeMirror.normalizeKeyMap = function(keymap) {
	var copy = {};
	for (var keyname in keymap) if (keymap.hasOwnProperty(keyname)) {
	var value = keymap[keyname];
	if (/^(name\|fallthrough\|(de\|at)tach)$/.test(keyname)) continue;
	if (value == "...") { delete keymap[keyname]; continue; }

	var keys = map(keyname.split(" "), normalizeKeyName);
	for (var i = 0; i < keys.length; i++) {
	var val, name;
	if (i == keys.length - 1) {
	name = keys.join(" ");
	val = value;
	} else {
	name = keys.slice(0, i + 1).join(" ");
	val = "...";
	}
	var prev = copy[name];
	if (!prev) copy[name] = val;
	else if (prev != val) throw new Error("Inconsistent bindings for " + name);
	}
	delete keymap[keyname];
	}
	for (var prop in copy) keymap[prop] = copy[prop];
	return keymap;
	};

	var lookupKey = CodeMirror.lookupKey = function(key, map, handle, context) {
	map = getKeyMap(map);
	var found = map.call ? map.call(key, context) : map[key];
	if (found === false) return "nothing";
	if (found === "...") return "multi";
	if (found != null && handle(found)) return "handled";

	if (map.fallthrough) {
	if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
	return lookupKey(key, map.fallthrough, handle, context);
	for (var i = 0; i < map.fallthrough.length; i++) {
	var result = lookupKey(key, map.fallthrough[i], handle, context);
	if (result) return result;
	}
	}
	};

	// Modifier key presses don't count as 'real' key presses for the
	// purpose of keymap fallthrough.
	var isModifierKey = CodeMirror.isModifierKey = function(value) {
	var name = typeof value == "string" ? value : keyNames[value.keyCode];
	return name == "Ctrl" \|\| name == "Alt" \|\| name == "Shift" \|\| name == "Mod";
	};

	// Look up the name of a key as indicated by an event object.
	var keyName = CodeMirror.keyName = function(event, noShift) {
	if (presto && event.keyCode == 34 && event["char"]) return false;
	var base = keyNames[event.keyCode], name = base;
	if (name == null \|\| event.altGraphKey) return false;
	if (event.altKey && base != "Alt") name = "Alt-" + name;
	if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") name = "Ctrl-" + name;
	if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") name = "Cmd-" + name;
	if (!noShift && event.shiftKey && base != "Shift") name = "Shift-" + name;
	return name;
	};

	function getKeyMap(val) {
	return typeof val == "string" ? keyMap[val] : val;
	}

	// FROMTEXTAREA

	CodeMirror.fromTextArea = function(textarea, options) {
	options = options ? copyObj(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 = activeElt();
	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) {}
	}
	}

	options.finishInit = function(cm) {
	cm.save = save;
	cm.getTextArea = function() { return textarea; };
	cm.toTextArea = function() {
	cm.toTextArea = isNaN; // Prevent this from being ran twice
	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;
	}
	};
	};

	textarea.style.display = "none";
	var cm = CodeMirror(function(node) {
	textarea.parentNode.insertBefore(node, textarea.nextSibling);
	}, options);
	return cm;
	};

	// STRING STREAM

	// Fed to the mode parsers, provides helper functions to make
	// parsers more succinct.

	var StringStream = CodeMirror.StringStream = function(string, tabSize) {
	this.pos = this.start = 0;
	this.string = string;
	this.tabSize = tabSize \|\| 8;
	this.lastColumnPos = this.lastColumnValue = 0;
	this.lineStart = 0;
	};

	StringStream.prototype = {
	eol: function() {return this.pos >= this.string.length;},
	sol: function() {return this.pos == this.lineStart;},
	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 - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
	},
	indentation: function() {
	return countColumn(this.string, null, this.tabSize) -
	(this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
	},
	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);},
	hideFirstChars: function(n, inner) {
	this.lineStart += n;
	try { return inner(); }
	finally { this.lineStart -= n; }
	}
	};

	// TEXTMARKERS

	// Created with markText and setBookmark methods. A TextMarker is a
	// handle that can be used to clear or find a marked position in the
	// document. Line objects hold arrays (markedSpans) containing
	// {from, to, marker} object pointing to such marker objects, and
	// indicating that such a marker is present on that line. Multiple
	// lines may point to the same marker when it spans across lines.
	// The spans will have null for their from/to properties when the
	// marker continues beyond the start/end of the line. Markers have
	// links back to the lines they currently touch.

	var nextMarkerId = 0;

	var TextMarker = CodeMirror.TextMarker = function(doc, type) {
	this.lines = [];
	this.type = type;
	this.doc = doc;
	this.id = ++nextMarkerId;
	};
	eventMixin(TextMarker);

	// Clear the marker.
	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 (cm && !this.collapsed) regLineChange(cm, lineNo(line), "text");
	else if (cm) {
	if (span.to != null) max = lineNo(line);
	if (span.from != null) min = lineNo(line);
	}
	line.markedSpans = removeMarkedSpan(line.markedSpans, span);
	if (span.from == null && 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(this.lines[i]), len = lineLength(visual);
	if (len > cm.display.maxLineLength) {
	cm.display.maxLine = visual;
	cm.display.maxLineLength = len;
	cm.display.maxLineChanged = true;
	}
	}

	if (min != null && cm && this.collapsed) 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.doc);
	}
	if (cm) signalLater(cm, "markerCleared", cm, this);
	if (withOp) endOperation(cm);
	if (this.parent) this.parent.clear();
	};

	// Find the position of the marker in the document. Returns a {from,
	// to} object by default. Side can be passed to get a specific side
	// -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
	// Pos objects returned contain a line object, rather than a line
	// number (used to prevent looking up the same line twice).
	TextMarker.prototype.find = function(side, lineObj) {
	if (side == null && this.type == "bookmark") side = 1;
	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) {
	from = Pos(lineObj ? line : lineNo(line), span.from);
	if (side == -1) return from;
	}
	if (span.to != null) {
	to = Pos(lineObj ? line : lineNo(line), span.to);
	if (side == 1) return to;
	}
	}
	return from && {from: from, to: to};
	};

	// Signals that the marker's widget changed, and surrounding layout
	// should be recomputed.
	TextMarker.prototype.changed = function() {
	var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
	if (!pos \|\| !cm) return;
	runInOp(cm, function() {
	var line = pos.line, lineN = lineNo(pos.line);
	var view = findViewForLine(cm, lineN);
	if (view) {
	clearLineMeasurementCacheFor(view);
	cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
	}
	cm.curOp.updateMaxLine = true;
	if (!lineIsHidden(widget.doc, line) && widget.height != null) {
	var oldHeight = widget.height;
	widget.height = null;
	var dHeight = widgetHeight(widget) - oldHeight;
	if (dHeight)
	updateLineHeight(line, line.height + dHeight);
	}
	});
	};

	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);
	}
	};

	// Collapsed markers have unique ids, in order to be able to order
	// them, which is needed for uniquely determining an outer marker
	// when they overlap (they may nest, but not partially overlap).
	var nextMarkerId = 0;

	// Create a marker, wire it up to the right lines, and
	function markText(doc, from, to, options, type) {
	// Shared markers (across linked documents) are handled separately
	// (markTextShared will call out to this again, once per
	// document).
	if (options && options.shared) return markTextShared(doc, from, to, options, type);
	// Ensure we are in an operation.
	if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);

	var marker = new TextMarker(doc, type), diff = cmp(from, to);
	if (options) copyObj(options, marker, false);
	// Don't connect empty markers unless clearWhenEmpty is false
	if (diff > 0 \|\| diff == 0 && marker.clearWhenEmpty !== false)
	return marker;
	if (marker.replacedWith) {
	// Showing up as a widget implies collapsed (widget replaces text)
	marker.collapsed = true;
	marker.widgetNode = elt("span", [marker.replacedWith], "CodeMirror-widget");
	if (!options.handleMouseEvents) marker.widgetNode.setAttribute("cm-ignore-events", "true");
	if (options.insertLeft) marker.widgetNode.insertLeft = true;
	}
	if (marker.collapsed) {
	if (conflictingCollapsedRange(doc, from.line, from, to, marker) \|\|
	from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
	throw new Error("Inserting collapsed marker partially overlapping an existing one");
	sawCollapsedSpans = true;
	}

	if (marker.addToHistory)
	addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN);

	var curLine = from.line, cm = doc.cm, updateMaxLine;
	doc.iter(curLine, to.line + 1, function(line) {
	if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
	updateMaxLine = true;
	if (marker.collapsed && curLine != from.line) updateLineHeight(line, 0);
	addMarkedSpan(line, new MarkedSpan(marker,
	curLine == from.line ? from.ch : null,
	curLine == to.line ? to.ch : null));
	++curLine;
	});
	// lineIsHidden depends on the presence of the spans, so needs a second pass
	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) {
	marker.id = ++nextMarkerId;
	marker.atomic = true;
	}
	if (cm) {
	// Sync editor state
	if (updateMaxLine) cm.curOp.updateMaxLine = true;
	if (marker.collapsed)
	regChange(cm, from.line, to.line + 1);
	else if (marker.className \|\| marker.title \|\| marker.startStyle \|\| marker.endStyle \|\| marker.css)
	for (var i = from.line; i <= to.line; i++) regLineChange(cm, i, "text");
	if (marker.atomic) reCheckSelection(cm.doc);
	signalLater(cm, "markerAdded", cm, marker);
	}
	return marker;
	}

	// SHARED TEXTMARKERS

	// A shared marker spans multiple linked documents. It is
	// implemented as a meta-marker-object controlling multiple normal
	// markers.
	var SharedTextMarker = CodeMirror.SharedTextMarker = function(markers, primary) {
	this.markers = markers;
	this.primary = primary;
	for (var i = 0; i < markers.length; ++i)
	markers[i].parent = this;
	};
	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(side, lineObj) {
	return this.primary.find(side, lineObj);
	};

	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.widgetNode;
	linkedDocs(doc, function(doc) {
	if (widget) options.widgetNode = 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);
	}

	function findSharedMarkers(doc) {
	return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())),
	function(m) { return m.parent; });
	}

	function copySharedMarkers(doc, markers) {
	for (var i = 0; i < markers.length; i++) {
	var marker = markers[i], pos = marker.find();
	var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
	if (cmp(mFrom, mTo)) {
	var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
	marker.markers.push(subMark);
	subMark.parent = marker;
	}
	}
	}

	function detachSharedMarkers(markers) {
	for (var i = 0; i < markers.length; i++) {
	var marker = markers[i], linked = [marker.primary.doc];;
	linkedDocs(marker.primary.doc, function(d) { linked.push(d); });
	for (var j = 0; j < marker.markers.length; j++) {
	var subMarker = marker.markers[j];
	if (indexOf(linked, subMarker.doc) == -1) {
	subMarker.parent = null;
	marker.markers.splice(j--, 1);
	}
	}
	}
	}

	// TEXTMARKER SPANS

	function MarkedSpan(marker, from, to) {
	this.marker = marker;
	this.from = from; this.to = to;
	}

	// Search an array of spans for a span matching the given marker.
	function getMarkedSpanFor(spans, marker) {
	if (spans) for (var i = 0; i < spans.length; ++i) {
	var span = spans[i];
	if (span.marker == marker) return span;
	}
	}
	// Remove a span from an array, returning undefined if no spans are
	// left (we don't store arrays for lines without spans).
	function removeMarkedSpan(spans, span) {
	for (var r, i = 0; i < spans.length; ++i)
	if (spans[i] != span) (r \|\| (r = [])).push(spans[i]);
	return r;
	}
	// Add a span to a line.
	function addMarkedSpan(line, span) {
	line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
	span.marker.attachLine(line);
	}

	// Used for the algorithm that adjusts markers for a change in the
	// document. These functions cut an array of spans at a given
	// character position, returning an array of remaining chunks (or
	// undefined if nothing remains).
	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 \|\| span.from == startCh && marker.type == "bookmark" && (!isInsert \|\| !span.marker.insertLeft)) {
	var endsAfter = span.to == null \|\| (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
	(nw \|\| (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
	}
	}
	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 \|\| span.from == endCh && marker.type == "bookmark" && (!isInsert \|\| span.marker.insertLeft)) {
	var startsBefore = span.from == null \|\| (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
	(nw \|\| (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
	span.to == null ? null : span.to - endCh));
	}
	}
	return nw;
	}

	// Given a change object, compute the new set of marker spans that
	// cover the line in which the change took place. Removes spans
	// entirely within the change, reconnects spans belonging to the
	// same marker that appear on both sides of the change, and cuts off
	// spans partially within the change. Returns an array of span
	// arrays with one element for each line in (after) the change.
	function stretchSpansOverChange(doc, change) {
	if (change.full) return null;
	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 = cmp(change.from, change.to) == 0;
	// 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);
	}
	}
	}
	// Make sure we didn't create any zero-length spans
	if (first) first = clearEmptySpans(first);
	if (last && last != first) last = clearEmptySpans(last);

	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(new MarkedSpan(first[i].marker, null, null));
	for (var i = 0; i < gap; ++i)
	newMarkers.push(gapMarkers);
	newMarkers.push(last);
	}
	return newMarkers;
	}

	// Remove spans that are empty and don't have a clearWhenEmpty
	// option of false.
	function clearEmptySpans(spans) {
	for (var i = 0; i < spans.length; ++i) {
	var span = spans[i];
	if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
	spans.splice(i--, 1);
	}
	if (!spans.length) return null;
	return spans;
	}

	// Used for un/re-doing changes from the history. Combines the
	// result of computing the existing spans with the set of spans that
	// existed in the history (so that deleting around a span and then
	// undoing brings back the span).
	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;
	}

	// Used to 'clip' out readOnly ranges when making a change.
	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(0);
	for (var j = 0; j < parts.length; ++j) {
	var p = parts[j];
	if (cmp(p.to, m.from) < 0 \|\| cmp(p.from, m.to) > 0) continue;
	var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
	if (dfrom < 0 \|\| !mk.inclusiveLeft && !dfrom)
	newParts.push({from: p.from, to: m.from});
	if (dto > 0 \|\| !mk.inclusiveRight && !dto)
	newParts.push({from: m.to, to: p.to});
	parts.splice.apply(parts, newParts);
	j += newParts.length - 1;
	}
	}
	return parts;
	}

	// Connect or disconnect spans from a line.
	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;
	}

	// Helpers used when computing which overlapping collapsed span
	// counts as the larger one.
	function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0; }
	function extraRight(marker) { return marker.inclusiveRight ? 1 : 0; }

	// Returns a number indicating which of two overlapping collapsed
	// spans is larger (and thus includes the other). Falls back to
	// comparing ids when the spans cover exactly the same range.
	function compareCollapsedMarkers(a, b) {
	var lenDiff = a.lines.length - b.lines.length;
	if (lenDiff != 0) return lenDiff;
	var aPos = a.find(), bPos = b.find();
	var fromCmp = cmp(aPos.from, bPos.from) \|\| extraLeft(a) - extraLeft(b);
	if (fromCmp) return -fromCmp;
	var toCmp = cmp(aPos.to, bPos.to) \|\| extraRight(a) - extraRight(b);
	if (toCmp) return toCmp;
	return b.id - a.id;
	}

	// Find out whether a line ends or starts in a collapsed span. If
	// so, return the marker for that span.
	function collapsedSpanAtSide(line, start) {
	var sps = sawCollapsedSpans && line.markedSpans, found;
	if (sps) for (var sp, i = 0; i < sps.length; ++i) {
	sp = sps[i];
	if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
	(!found \|\| compareCollapsedMarkers(found, sp.marker) < 0))
	found = sp.marker;
	}
	return found;
	}
	function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true); }
	function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false); }

	// Test whether there exists a collapsed span that partially
	// overlaps (covers the start or end, but not both) of a new span.
	// Such overlap is not allowed.
	function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
	var line = getLine(doc, lineNo);
	var sps = sawCollapsedSpans && line.markedSpans;
	if (sps) for (var i = 0; i < sps.length; ++i) {
	var sp = sps[i];
	if (!sp.marker.collapsed) continue;
	var found = sp.marker.find(0);
	var fromCmp = cmp(found.from, from) \|\| extraLeft(sp.marker) - extraLeft(marker);
	var toCmp = cmp(found.to, to) \|\| extraRight(sp.marker) - extraRight(marker);
	if (fromCmp >= 0 && toCmp <= 0 \|\| fromCmp <= 0 && toCmp >= 0) continue;
	if (fromCmp <= 0 && (cmp(found.to, from) > 0 \|\| (sp.marker.inclusiveRight && marker.inclusiveLeft)) \|\|
	fromCmp >= 0 && (cmp(found.from, to) < 0 \|\| (sp.marker.inclusiveLeft && marker.inclusiveRight)))
	return true;
	}
	}

	// A visual line is a line as drawn on the screen. Folding, for
	// example, can cause multiple logical lines to appear on the same
	// visual line. This finds the start of the visual line that the
	// given line is part of (usually that is the line itself).
	function visualLine(line) {
	var merged;
	while (merged = collapsedSpanAtStart(line))
	line = merged.find(-1, true).line;
	return line;
	}

	// Returns an array of logical lines that continue the visual line
	// started by the argument, or undefined if there are no such lines.
	function visualLineContinued(line) {
	var merged, lines;
	while (merged = collapsedSpanAtEnd(line)) {
	line = merged.find(1, true).line;
	(lines \|\| (lines = [])).push(line);
	}
	return lines;
	}

	// Get the line number of the start of the visual line that the
	// given line number is part of.
	function visualLineNo(doc, lineN) {
	var line = getLine(doc, lineN), vis = visualLine(line);
	if (line == vis) return lineN;
	return lineNo(vis);
	}
	// Get the line number of the start of the next visual line after
	// the given line.
	function visualLineEndNo(doc, lineN) {
	if (lineN > doc.lastLine()) return lineN;
	var line = getLine(doc, lineN), merged;
	if (!lineIsHidden(doc, line)) return lineN;
	while (merged = collapsedSpanAtEnd(line))
	line = merged.find(1, true).line;
	return lineNo(line) + 1;
	}

	// Compute whether a line is hidden. Lines count as hidden when they
	// are part of a visual line that starts with another line, or when
	// they are entirely covered by collapsed, non-widget span.
	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.widgetNode) 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(1, true);
	return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.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.widgetNode && sp.from == span.to &&
	(sp.to == null \|\| sp.to != span.from) &&
	(sp.marker.inclusiveLeft \|\| span.marker.inclusiveRight) &&
	lineIsHiddenInner(doc, line, sp)) return true;
	}
	}

	// LINE WIDGETS

	// Line widgets are block elements displayed above or below a line.

	var LineWidget = CodeMirror.LineWidget = function(doc, node, options) {
	if (options) for (var opt in options) if (options.hasOwnProperty(opt))
	this[opt] = options[opt];
	this.doc = doc;
	this.node = node;
	};
	eventMixin(LineWidget);

	function adjustScrollWhenAboveVisible(cm, line, diff) {
	if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) \|\| cm.doc.scrollTop))
	addToScrollPos(cm, null, diff);
	}

	LineWidget.prototype.clear = function() {
	var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(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) line.widgets = null;
	var height = widgetHeight(this);
	updateLineHeight(line, Math.max(0, line.height - height));
	if (cm) runInOp(cm, function() {
	adjustScrollWhenAboveVisible(cm, line, -height);
	regLineChange(cm, no, "widget");
	});
	};
	LineWidget.prototype.changed = function() {
	var oldH = this.height, cm = this.doc.cm, line = this.line;
	this.height = null;
	var diff = widgetHeight(this) - oldH;
	if (!diff) return;
	updateLineHeight(line, line.height + diff);
	if (cm) runInOp(cm, function() {
	cm.curOp.forceUpdate = true;
	adjustScrollWhenAboveVisible(cm, line, diff);
	});
	};

	function widgetHeight(widget) {
	if (widget.height != null) return widget.height;
	var cm = widget.doc.cm;
	if (!cm) return 0;
	if (!contains(document.body, widget.node)) {
	var parentStyle = "position: relative;";
	if (widget.coverGutter)
	parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
	if (widget.noHScroll)
	parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
	removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
	}
	return widget.height = widget.node.offsetHeight;
	}

	function addLineWidget(doc, handle, node, options) {
	var widget = new LineWidget(doc, node, options);
	var cm = doc.cm;
	if (cm && widget.noHScroll) cm.display.alignWidgets = true;
	changeLine(doc, handle, "widget", 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 (cm && !lineIsHidden(doc, line)) {
	var aboveVisible = heightAtLine(line) < doc.scrollTop;
	updateLineHeight(line, line.height + widgetHeight(widget));
	if (aboveVisible) addToScrollPos(cm, null, widget.height);
	cm.curOp.forceUpdate = true;
	}
	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);
	Line.prototype.lineNo = function() { return lineNo(this); };

	// Change the content (text, markers) of a line. Automatically
	// invalidates cached information and tries to re-estimate the
	// line's height.
	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);
	}

	// Detach a line from the document tree and its markers.
	function cleanUpLine(line) {
	line.parent = null;
	detachMarkedSpans(line);
	}

	function extractLineClasses(type, output) {
	if (type) for (;;) {
	var lineClass = type.match(/(?:^\|\s+)line-(background-)?(\S+)/);
	if (!lineClass) break;
	type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
	var prop = lineClass[1] ? "bgClass" : "textClass";
	if (output[prop] == null)
	output[prop] = lineClass[2];
	else if (!(new RegExp("(?:^\|\s)" + lineClass[2] + "(?:$\|\s)")).test(output[prop]))
	output[prop] += " " + lineClass[2];
	}
	return type;
	}

	function callBlankLine(mode, state) {
	if (mode.blankLine) return mode.blankLine(state);
	if (!mode.innerMode) return;
	var inner = CodeMirror.innerMode(mode, state);
	if (inner.mode.blankLine) return inner.mode.blankLine(inner.state);
	}

	function readToken(mode, stream, state, inner) {
	for (var i = 0; i < 10; i++) {
	if (inner) inner[0] = CodeMirror.innerMode(mode, state).mode;
	var style = mode.token(stream, state);
	if (stream.pos > stream.start) return style;
	}
	throw new Error("Mode " + mode.name + " failed to advance stream.");
	}

	// Utility for getTokenAt and getLineTokens
	function takeToken(cm, pos, precise, asArray) {
	function getObj(copy) {
	return {start: stream.start, end: stream.pos,
	string: stream.current(),
	type: style \|\| null,
	state: copy ? copyState(doc.mode, state) : state};
	}

	var doc = cm.doc, mode = doc.mode, style;
	pos = clipPos(doc, pos);
	var line = getLine(doc, pos.line), state = getStateBefore(cm, pos.line, precise);
	var stream = new StringStream(line.text, cm.options.tabSize), tokens;
	if (asArray) tokens = [];
	while ((asArray \|\| stream.pos < pos.ch) && !stream.eol()) {
	stream.start = stream.pos;
	style = readToken(mode, stream, state);
	if (asArray) tokens.push(getObj(true));
	}
	return asArray ? tokens : getObj();
	}

	// Run the given mode's parser over a line, calling f for each token.
	function runMode(cm, text, mode, state, f, lineClasses, forceToEnd) {
	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;
	var inner = cm.options.addModeClass && [null];
	if (text == "") extractLineClasses(callBlankLine(mode, state), lineClasses);
	while (!stream.eol()) {
	if (stream.pos > cm.options.maxHighlightLength) {
	flattenSpans = false;
	if (forceToEnd) processLine(cm, text, state, stream.pos);
	stream.pos = text.length;
	style = null;
	} else {
	style = extractLineClasses(readToken(mode, stream, state, inner), lineClasses);
	}
	if (inner) {
	var mName = inner[0].name;
	if (mName) style = "m-" + (style ? mName + " " + style : mName);
	}
	if (!flattenSpans \|\| curStyle != style) {
	while (curStart < stream.start) {
	curStart = Math.min(stream.start, curStart + 50000);
	f(curStart, curStyle);
	}
	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;
	}
	}

	// Compute a style array (an array starting with a mode generation
	// -- for invalidation -- followed by pairs of end positions and
	// style strings), which is used to highlight the tokens on the
	// line.
	function highlightLine(cm, line, state, forceToEnd) {
	// 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], lineClasses = {};
	// Compute the base array of styles
	runMode(cm, line.text, cm.doc.mode, state, function(end, style) {
	st.push(end, style);
	}, lineClasses, forceToEnd);

	// 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, "cm-overlay " + style);
	i = start + 2;
	} else {
	for (; start < i; start += 2) {
	var cur = st[start+1];
	st[start+1] = (cur ? cur + " " : "") + "cm-overlay " + style;
	}
	}
	}, lineClasses);
	}

	return {styles: st, classes: lineClasses.bgClass \|\| lineClasses.textClass ? lineClasses : null};
	}

	function getLineStyles(cm, line, updateFrontier) {
	if (!line.styles \|\| line.styles[0] != cm.state.modeGen) {
	var result = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
	line.styles = result.styles;
	if (result.classes) line.styleClasses = result.classes;
	else if (line.styleClasses) line.styleClasses = null;
	if (updateFrontier === cm.doc.frontier) cm.doc.frontier++;
	}
	return line.styles;
	}

	// Lightweight form of highlight -- proceed over this line and
	// update state, but don't save a style array. Used for lines that
	// aren't currently visible.
	function processLine(cm, text, state, startAt) {
	var mode = cm.doc.mode;
	var stream = new StringStream(text, cm.options.tabSize);
	stream.start = stream.pos = startAt \|\| 0;
	if (text == "") callBlankLine(mode, state);
	while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
	readToken(mode, stream, state);
	stream.start = stream.pos;
	}
	}

	// Convert a style as returned by a mode (either null, or a string
	// containing one or more styles) to a CSS style. This is cached,
	// and also looks for line-wide styles.
	var styleToClassCache = {}, styleToClassCacheWithMode = {};
	function interpretTokenStyle(style, options) {
	if (!style \|\| /^\s*$/.test(style)) return null;
	var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
	return cache[style] \|\|
	(cache[style] = style.replace(/\S+/g, "cm-$&"));
	}

	// Render the DOM representation of the text of a line. Also builds
	// up a 'line map', which points at the DOM nodes that represent
	// specific stretches of text, and is used by the measuring code.
	// The returned object contains the DOM node, this map, and
	// information about line-wide styles that were set by the mode.
	function buildLineContent(cm, lineView) {
	// The padding-right forces the element to have a 'border', which
	// is needed on Webkit to be able to get line-level bounding
	// rectangles for it (in measureChar).
	var content = elt("span", null, null, webkit ? "padding-right: .1px" : null);
	var builder = {pre: elt("pre", [content], "CodeMirror-line"), content: content,
	col: 0, pos: 0, cm: cm,
	splitSpaces: (ie \|\| webkit) && cm.getOption("lineWrapping")};
	lineView.measure = {};

	// Iterate over the logical lines that make up this visual line.
	for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
	var line = i ? lineView.rest[i - 1] : lineView.line, order;
	builder.pos = 0;
	builder.addToken = buildToken;
	// Optionally wire in some hacks into the token-rendering
	// algorithm, to deal with browser quirks.
	if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line)))
	builder.addToken = buildTokenBadBidi(builder.addToken, order);
	builder.map = [];
	var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
	insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
	if (line.styleClasses) {
	if (line.styleClasses.bgClass)
	builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass \|\| "");
	if (line.styleClasses.textClass)
	builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass \|\| "");
	}

	// Ensure at least a single node is present, for measuring.
	if (builder.map.length == 0)
	builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));

	// Store the map and a cache object for the current logical line
	if (i == 0) {
	lineView.measure.map = builder.map;
	lineView.measure.cache = {};
	} else {
	(lineView.measure.maps \|\| (lineView.measure.maps = [])).push(builder.map);
	(lineView.measure.caches \|\| (lineView.measure.caches = [])).push({});
	}
	}

	// See issue #2901
	if (webkit && /\bcm-tab\b/.test(builder.content.lastChild.className))
	builder.content.className = "cm-tab-wrap-hack";

	signal(cm, "renderLine", cm, lineView.line, builder.pre);
	if (builder.pre.className)
	builder.textClass = joinClasses(builder.pre.className, builder.textClass \|\| "");

	return builder;
	}

	function defaultSpecialCharPlaceholder(ch) {
	var token = elt("span", "\u2022", "cm-invalidchar");
	token.title = "\\u" + ch.charCodeAt(0).toString(16);
	token.setAttribute("aria-label", token.title);
	return token;
	}

	// Build up the DOM representation for a single token, and add it to
	// the line map. Takes care to render special characters separately.
	function buildToken(builder, text, style, startStyle, endStyle, title, css) {
	if (!text) return;
	var displayText = builder.splitSpaces ? text.replace(/ {3,}/g, splitSpaces) : text;
	var special = builder.cm.state.specialChars, mustWrap = false;
	if (!special.test(text)) {
	builder.col += text.length;
	var content = document.createTextNode(displayText);
	builder.map.push(builder.pos, builder.pos + text.length, content);
	if (ie && ie_version < 9) mustWrap = true;
	builder.pos += text.length;
	} else {
	var content = document.createDocumentFragment(), pos = 0;
	while (true) {
	special.lastIndex = pos;
	var m = special.exec(text);
	var skipped = m ? m.index - pos : text.length - pos;
	if (skipped) {
	var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
	if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
	else content.appendChild(txt);
	builder.map.push(builder.pos, builder.pos + skipped, txt);
	builder.col += skipped;
	builder.pos += skipped;
	}
	if (!m) break;
	pos += skipped + 1;
	if (m[0] == "\t") {
	var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
	var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
	txt.setAttribute("role", "presentation");
	txt.setAttribute("cm-text", "\t");
	builder.col += tabWidth;
	} else if (m[0] == "\r" \|\| m[0] == "\n") {
	var txt = content.appendChild(elt("span", m[0] == "\r" ? "␍" : "␤", "cm-invalidchar"));
	txt.setAttribute("cm-text", m[0]);
	builder.col += 1;
	} else {
	var txt = builder.cm.options.specialCharPlaceholder(m[0]);
	txt.setAttribute("cm-text", m[0]);
	if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
	else content.appendChild(txt);
	builder.col += 1;
	}
	builder.map.push(builder.pos, builder.pos + 1, txt);
	builder.pos++;
	}
	}
	if (style \|\| startStyle \|\| endStyle \|\| mustWrap \|\| css) {
	var fullStyle = style \|\| "";
	if (startStyle) fullStyle += startStyle;
	if (endStyle) fullStyle += endStyle;
	var token = elt("span", [content], fullStyle, css);
	if (title) token.title = title;
	return builder.content.appendChild(token);
	}
	builder.content.appendChild(content);
	}

	function splitSpaces(old) {
	var out = " ";
	for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
	out += " ";
	return out;
	}

	// Work around nonsense dimensions being reported for stretches of
	// right-to-left text.
	function buildTokenBadBidi(inner, order) {
	return function(builder, text, style, startStyle, endStyle, title, css) {
	style = style ? style + " cm-force-border" : "cm-force-border";
	var start = builder.pos, end = start + text.length;
	for (;;) {
	// Find the part that overlaps with the start of this text
	for (var i = 0; i < order.length; i++) {
	var part = order[i];
	if (part.to > start && part.from <= start) break;
	}
	if (part.to >= end) return inner(builder, text, style, startStyle, endStyle, title, css);
	inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
	startStyle = null;
	text = text.slice(part.to - start);
	start = part.to;
	}
	};
	}

	function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
	var widget = !ignoreWidget && marker.widgetNode;
	if (widget) builder.map.push(builder.pos, builder.pos + size, widget);
	if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
	if (!widget)
	widget = builder.content.appendChild(document.createElement("span"));
	widget.setAttribute("cm-marker", marker.id);
	}
	if (widget) {
	builder.cm.display.input.setUneditable(widget);
	builder.content.appendChild(widget);
	}
	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.cm.options));
	return;
	}

	var len = allText.length, pos = 0, i = 1, text = "", style, css;
	var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
	for (;;) {
	if (nextChange == pos) { // Update current marker set
	spanStyle = spanEndStyle = spanStartStyle = title = css = "";
	collapsed = null; nextChange = Infinity;
	var foundBookmarks = [];
	for (var j = 0; j < spans.length; ++j) {
	var sp = spans[j], m = sp.marker;
	if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
	foundBookmarks.push(m);
	} else if (sp.from <= pos && (sp.to == null \|\| sp.to > pos \|\| m.collapsed && sp.to == pos && sp.from == pos)) {
	if (sp.to != null && sp.to != pos && nextChange > sp.to) {
	nextChange = sp.to;
	spanEndStyle = "";
	}
	if (m.className) spanStyle += " " + m.className;
	if (m.css) css = m.css;
	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 \|\| compareCollapsedMarkers(collapsed.marker, m) < 0))
	collapsed = sp;
	} else if (sp.from > pos && nextChange > sp.from) {
	nextChange = sp.from;
	}
	}
	if (collapsed && (collapsed.from \|\| 0) == pos) {
	buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
	collapsed.marker, collapsed.from == null);
	if (collapsed.to == null) return;
	if (collapsed.to == pos) collapsed = false;
	}
	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, css);
	}
	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.cm.options);
	}
	}
	}

	// DOCUMENT DATA STRUCTURE

	// By default, updates that start and end at the beginning of a line
	// are treated specially, in order to make the association of line
	// widgets and marker elements with the text behave more intuitive.
	function isWholeLineUpdate(doc, change) {
	return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
	(!doc.cm \|\| doc.cm.options.wholeLineUpdateBefore);
	}

	// Perform a change on the document data structure.
	function updateDoc(doc, change, markedSpans, estimateHeight) {
	function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
	function update(line, text, spans) {
	updateLine(line, text, spans, estimateHeight);
	signalLater(line, "change", line, change);
	}
	function linesFor(start, end) {
	for (var i = start, result = []; i < end; ++i)
	result.push(new Line(text[i], spansFor(i), estimateHeight));
	return result;
	}

	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;

	// Adjust the line structure
	if (change.full) {
	doc.insert(0, linesFor(0, text.length));
	doc.remove(text.length, doc.size - text.length);
	} else if (isWholeLineUpdate(doc, change)) {
	// This is a whole-line replace. Treated specially to make
	// sure line objects move the way they are supposed to.
	var added = linesFor(0, text.length - 1);
	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 {
	var added = linesFor(1, text.length - 1);
	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);
	var added = linesFor(1, text.length - 1);
	if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
	doc.insert(from.line + 1, added);
	}

	signalLater(doc, "change", doc, change);
	}

	// The document is represented as a BTree consisting of leaves, with
	// chunk of lines in them, and branches, with up to ten leaves or
	// other branch nodes below them. The top node is always a branch
	// node, and is the document object itself (meaning it has
	// additional methods and properties).
	//
	// All nodes have parent links. The tree is used both to go from
	// line numbers to line objects, and to go from objects to numbers.
	// It also indexes by height, and is used to convert between height
	// and line object, and to find the total height of the document.
	//
	// See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

	function LeafChunk(lines) {
	this.lines = lines;
	this.parent = null;
	for (var i = 0, height = 0; i < lines.length; ++i) {
	lines[i].parent = this;
	height += lines[i].height;
	}
	this.height = height;
	}

	LeafChunk.prototype = {
	chunkSize: function() { return this.lines.length; },
	// Remove the n lines at offset 'at'.
	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);
	},
	// Helper used to collapse a small branch into a single leaf.
	collapse: function(lines) {
	lines.push.apply(lines, this.lines);
	},
	// Insert the given array of lines at offset 'at', count them as
	// having the given height.
	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; i < lines.length; ++i) lines[i].parent = this;
	},
	// Used to iterate over a part of the tree.
	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; i < children.length; ++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 the result is smaller than 25 lines, ensure that it is a
	// single leaf node.
	if (this.size - n < 25 &&
	(this.children.length > 1 \|\| !(this.children[0] instanceof LeafChunk))) {
	var lines = [];
	this.collapse(lines);
	this.children = [new LeafChunk(lines)];
	this.children[0].parent = this;
	}
	},
	collapse: function(lines) {
	for (var i = 0; i < this.children.length; ++i) this.children[i].collapse(lines);
	},
	insertInner: function(at, lines, height) {
	this.size += lines.length;
	this.height += height;
	for (var i = 0; i < this.children.length; ++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;
	}
	},
	// When a node has grown, check whether it should be split.
	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; i < this.children.length; ++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, lineSep) {
	if (!(this instanceof Doc)) return new Doc(text, mode, firstLine, lineSep);
	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.cleanGeneration = 1;
	this.frontier = firstLine;
	var start = Pos(firstLine, 0);
	this.sel = simpleSelection(start);
	this.history = new History(null);
	this.id = ++nextDocId;
	this.modeOption = mode;
	this.lineSep = lineSep;

	if (typeof text == "string") text = this.splitLines(text);
	updateDoc(this, {from: start, to: start, text: text});
	setSelection(this, simpleSelection(start), sel_dontScroll);
	};

	Doc.prototype = createObj(BranchChunk.prototype, {
	constructor: Doc,
	// Iterate over the document. Supports two forms -- with only one
	// argument, it calls that for each line in the document. With
	// three, it iterates over the range given by the first two (with
	// the second being non-inclusive).
	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);
	},

	// Non-public interface for adding and removing lines.
	insert: function(at, lines) {
	var height = 0;
	for (var i = 0; i < lines.length; ++i) height += lines[i].height;
	this.insertInner(at - this.first, lines, height);
	},
	remove: function(at, n) { this.removeInner(at - this.first, n); },

	// From here, the methods are part of the public interface. Most
	// are also available from CodeMirror (editor) instances.

	getValue: function(lineSep) {
	var lines = getLines(this, this.first, this.first + this.size);
	if (lineSep === false) return lines;
	return lines.join(lineSep \|\| this.lineSeparator());
	},
	setValue: docMethodOp(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: this.splitLines(code), origin: "setValue", full: true}, true);
	setSelection(this, simpleSelection(top));
	}),
	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 \|\| this.lineSeparator());
	},

	getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},

	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(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 range = this.sel.primary(), pos;
	if (start == null \|\| start == "head") pos = range.head;
	else if (start == "anchor") pos = range.anchor;
	else if (start == "end" \|\| start == "to" \|\| start === false) pos = range.to();
	else pos = range.from();
	return pos;
	},
	listSelections: function() { return this.sel.ranges; },
	somethingSelected: function() {return this.sel.somethingSelected();},

	setCursor: docMethodOp(function(line, ch, options) {
	setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch \|\| 0) : line), null, options);
	}),
	setSelection: docMethodOp(function(anchor, head, options) {
	setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head \|\| anchor), options);
	}),
	extendSelection: docMethodOp(function(head, other, options) {
	extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
	}),
	extendSelections: docMethodOp(function(heads, options) {
	extendSelections(this, clipPosArray(this, heads, options));
	}),
	extendSelectionsBy: docMethodOp(function(f, options) {
	extendSelections(this, map(this.sel.ranges, f), options);
	}),
	setSelections: docMethodOp(function(ranges, primary, options) {
	if (!ranges.length) return;
	for (var i = 0, out = []; i < ranges.length; i++)
	out[i] = new Range(clipPos(this, ranges[i].anchor),
	clipPos(this, ranges[i].head));
	if (primary == null) primary = Math.min(ranges.length - 1, this.sel.primIndex);
	setSelection(this, normalizeSelection(out, primary), options);
	}),
	addSelection: docMethodOp(function(anchor, head, options) {
	var ranges = this.sel.ranges.slice(0);
	ranges.push(new Range(clipPos(this, anchor), clipPos(this, head \|\| anchor)));
	setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
	}),

	getSelection: function(lineSep) {
	var ranges = this.sel.ranges, lines;
	for (var i = 0; i < ranges.length; i++) {
	var sel = getBetween(this, ranges[i].from(), ranges[i].to());
	lines = lines ? lines.concat(sel) : sel;
	}
	if (lineSep === false) return lines;
	else return lines.join(lineSep \|\| this.lineSeparator());
	},
	getSelections: function(lineSep) {
	var parts = [], ranges = this.sel.ranges;
	for (var i = 0; i < ranges.length; i++) {
	var sel = getBetween(this, ranges[i].from(), ranges[i].to());
	if (lineSep !== false) sel = sel.join(lineSep \|\| this.lineSeparator());
	parts[i] = sel;
	}
	return parts;
	},
	replaceSelection: function(code, collapse, origin) {
	var dup = [];
	for (var i = 0; i < this.sel.ranges.length; i++)
	dup[i] = code;
	this.replaceSelections(dup, collapse, origin \|\| "+input");
	},
	replaceSelections: docMethodOp(function(code, collapse, origin) {
	var changes = [], sel = this.sel;
	for (var i = 0; i < sel.ranges.length; i++) {
	var range = sel.ranges[i];
	changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
	}
	var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
	for (var i = changes.length - 1; i >= 0; i--)
	makeChange(this, changes[i]);
	if (newSel) setSelectionReplaceHistory(this, newSel);
	else if (this.cm) ensureCursorVisible(this.cm);
	}),
	undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
	redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
	undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
	redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),

	setExtending: function(val) {this.extend = val;},
	getExtending: function() {return this.extend;},

	historySize: function() {
	var hist = this.history, done = 0, undone = 0;
	for (var i = 0; i < hist.done.length; i++) if (!hist.done[i].ranges) ++done;
	for (var i = 0; i < hist.undone.length; i++) if (!hist.undone[i].ranges) ++undone;
	return {undo: done, redo: undone};
	},
	clearHistory: function() {this.history = new History(this.history.maxGeneration);},

	markClean: function() {
	this.cleanGeneration = this.changeGeneration(true);
	},
	changeGeneration: function(forceSplit) {
	if (forceSplit)
	this.history.lastOp = this.history.lastSelOp = 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 = new History(this.history.maxGeneration);
	hist.done = copyHistoryArray(histData.done.slice(0), null, true);
	hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
	},

	addLineClass: docMethodOp(function(handle, where, cls) {
	return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
	var prop = where == "text" ? "textClass"
	: where == "background" ? "bgClass"
	: where == "gutter" ? "gutterClass" : "wrapClass";
	if (!line[prop]) line[prop] = cls;
	else if (classTest(cls).test(line[prop])) return false;
	else line[prop] += " " + cls;
	return true;
	});
	}),
	removeLineClass: docMethodOp(function(handle, where, cls) {
	return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
	var prop = where == "text" ? "textClass"
	: where == "background" ? "bgClass"
	: where == "gutter" ? "gutterClass" : "wrapClass";
	var cur = line[prop];
	if (!cur) return false;
	else if (cls == null) line[prop] = null;
	else {
	var found = cur.match(classTest(cls));
	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: docMethodOp(function(handle, node, options) {
	return addLineWidget(this, handle, node, options);
	}),
	removeLineWidget: function(widget) { widget.clear(); },

	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,
	clearWhenEmpty: false, shared: options && options.shared,
	handleMouseEvents: options && options.handleMouseEvents};
	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;
	},
	findMarks: function(from, to, filter) {
	from = clipPos(this, from); to = clipPos(this, to);
	var found = [], lineNo = from.line;
	this.iter(from.line, to.line + 1, function(line) {
	var spans = line.markedSpans;
	if (spans) for (var i = 0; i < spans.length; i++) {
	var span = spans[i];
	if (!(lineNo == from.line && from.ch > span.to \|\|
	span.from == null && lineNo != from.line\|\|
	lineNo == to.line && span.from > to.ch) &&
	(!filter \|\| filter(span.marker)))
	found.push(span.marker.parent \|\| span.marker);
	}
	++lineNo;
	});
	return found;
	},
	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, this.lineSep);
	doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
	doc.sel = this.sel;
	doc.extend = false;
	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, this.lineSep);
	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}];
	copySharedMarkers(copy, findSharedMarkers(this));
	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);
	detachSharedMarkers(findSharedMarkers(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 = new History(null);
	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;},

	splitLines: function(str) {
	if (this.lineSep) return str.split(this.lineSep);
	return splitLinesAuto(str);
	},
	lineSeparator: function() { return this.lineSep \|\| "\n"; }
	});

	// Public alias.
	Doc.prototype.eachLine = Doc.prototype.iter;

	// Set up methods on CodeMirror's prototype to redirect to the editor's document.
	var dontDelegate = "iter insert remove copy getEditor constructor".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);

	// Call f for all linked documents.
	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);
	}

	// Attach a document to an editor.
	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) findMaxLine(cm);
	cm.options.mode = doc.modeOption;
	regChange(cm);
	}

	// LINE UTILITIES

	// Find the line object corresponding to the given line number.
	function getLine(doc, n) {
	n -= doc.first;
	if (n < 0 \|\| n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.");
	for (var chunk = doc; !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];
	}

	// Get the part of a document between two positions, as an array of
	// strings.
	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;
	}
	// Get the lines between from and to, as array of strings.
	function getLines(doc, from, to) {
	var out = [];
	doc.iter(from, to, function(line) { out.push(line.text); });
	return out;
	}

	// Update the height of a line, propagating the height change
	// upwards to parent nodes.
	function updateLineHeight(line, height) {
	var diff = height - line.height;
	if (diff) for (var n = line; n; n = n.parent) n.height += diff;
	}

	// Given a line object, find its line number by walking up through
	// its parent links.
	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;
	}

	// Find the line at the given vertical position, using the height
	// information in the document tree.
	function lineAtHeight(chunk, h) {
	var n = chunk.first;
	outer: do {
	for (var i = 0; i < chunk.children.length; ++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; i < chunk.lines.length; ++i) {
	var line = chunk.lines[i], lh = line.height;
	if (h < lh) break;
	h -= lh;
	}
	return n + i;
	}


	// Find the height above the given line.
	function heightAtLine(lineObj) {
	lineObj = visualLine(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;
	}

	// Get the bidi ordering for the given line (and cache it). Returns
	// false for lines that are fully left-to-right, and an array of
	// BidiSpan objects otherwise.
	function getOrder(line) {
	var order = line.order;
	if (order == null) order = line.order = bidiOrdering(line.text);
	return order;
	}

	// HISTORY

	function History(startGen) {
	// Arrays of change events and selections. Doing something adds an
	// event to done and clears undo. Undoing moves events from done
	// to undone, redoing moves them in the other direction.
	this.done = []; this.undone = [];
	this.undoDepth = Infinity;
	// Used to track when changes can be merged into a single undo
	// event
	this.lastModTime = this.lastSelTime = 0;
	this.lastOp = this.lastSelOp = null;
	this.lastOrigin = this.lastSelOrigin = null;
	// Used by the isClean() method
	this.generation = this.maxGeneration = startGen \|\| 1;
	}

	// Create a history change event from an updateDoc-style change
	// object.
	function historyChangeFromChange(doc, change) {
	var histChange = {from: copyPos(change.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;
	}

	// Pop all selection events off the end of a history array. Stop at
	// a change event.
	function clearSelectionEvents(array) {
	while (array.length) {
	var last = lst(array);
	if (last.ranges) array.pop();
	else break;
	}
	}

	// Find the top change event in the history. Pop off selection
	// events that are in the way.
	function lastChangeEvent(hist, force) {
	if (force) {
	clearSelectionEvents(hist.done);
	return lst(hist.done);
	} else if (hist.done.length && !lst(hist.done).ranges) {
	return lst(hist.done);
	} else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
	hist.done.pop();
	return lst(hist.done);
	}
	}

	// Register a change in the history. Merges changes that are within
	// a single operation, ore are close together with an origin that
	// allows merging (starting with "+") into a single event.
	function addChangeToHistory(doc, change, selAfter, opId) {
	var hist = doc.history;
	hist.undone.length = 0;
	var time = +new Date, cur;

	if ((hist.lastOp == opId \|\|
	hist.lastOrigin == change.origin && change.origin &&
	((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) \|\|
	change.origin.charAt(0) == "*")) &&
	(cur = lastChangeEvent(hist, hist.lastOp == opId))) {
	// Merge this change into the last event
	var last = lst(cur.changes);
	if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
	// 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));
	}
	} else {
	// Can not be merged, start a new event.
	var before = lst(hist.done);
	if (!before \|\| !before.ranges)
	pushSelectionToHistory(doc.sel, hist.done);
	cur = {changes: [historyChangeFromChange(doc, change)],
	generation: hist.generation};
	hist.done.push(cur);
	while (hist.done.length > hist.undoDepth) {
	hist.done.shift();
	if (!hist.done[0].ranges) hist.done.shift();
	}
	}
	hist.done.push(selAfter);
	hist.generation = ++hist.maxGeneration;
	hist.lastModTime = hist.lastSelTime = time;
	hist.lastOp = hist.lastSelOp = opId;
	hist.lastOrigin = hist.lastSelOrigin = change.origin;

	if (!last) signal(doc, "historyAdded");
	}

	function selectionEventCanBeMerged(doc, origin, prev, sel) {
	var ch = origin.charAt(0);
	return ch == "*" \|\|
	ch == "+" &&
	prev.ranges.length == sel.ranges.length &&
	prev.somethingSelected() == sel.somethingSelected() &&
	new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500);
	}

	// Called whenever the selection changes, sets the new selection as
	// the pending selection in the history, and pushes the old pending
	// selection into the 'done' array when it was significantly
	// different (in number of selected ranges, emptiness, or time).
	function addSelectionToHistory(doc, sel, opId, options) {
	var hist = doc.history, origin = options && options.origin;

	// A new event is started when the previous origin does not match
	// the current, or the origins don't allow matching. Origins
	// starting with * are always merged, those starting with + are
	// merged when similar and close together in time.
	if (opId == hist.lastSelOp \|\|
	(origin && hist.lastSelOrigin == origin &&
	(hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin \|\|
	selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
	hist.done[hist.done.length - 1] = sel;
	else
	pushSelectionToHistory(sel, hist.done);

	hist.lastSelTime = +new Date;
	hist.lastSelOrigin = origin;
	hist.lastSelOp = opId;
	if (options && options.clearRedo !== false)
	clearSelectionEvents(hist.undone);
	}

	function pushSelectionToHistory(sel, dest) {
	var top = lst(dest);
	if (!(top && top.ranges && top.equals(sel)))
	dest.push(sel);
	}

	// Used to store marked span information in the history.
	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;
	});
	}

	// When un/re-doing restores text containing marked spans, those
	// that have been explicitly cleared should not be restored.
	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;
	}

	// Retrieve and filter the old marked spans stored in a change event.
	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, instantiateSel) {
	for (var i = 0, copy = []; i < events.length; ++i) {
	var event = events[i];
	if (event.ranges) {
	copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
	continue;
	}
	var changes = event.changes, newChanges = [];
	copy.push({changes: newChanges});
	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 rebaseHistSelSingle(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;
	if (sub.ranges) {
	if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
	for (var j = 0; j < sub.ranges.length; j++) {
	rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
	rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
	}
	continue;
	}
	for (var j = 0; j < sub.changes.length; ++j) {
	var cur = sub.changes[j];
	if (to < cur.from.line) {
	cur.from = Pos(cur.from.line + diff, cur.from.ch);
	cur.to = Pos(cur.to.line + diff, cur.to.ch);
	} else if (from <= cur.to.line) {
	ok = false;
	break;
	}
	}
	if (!ok) {
	array.splice(0, i + 1);
	i = 0;
	}
	}
	}

	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 UTILITIES

	// Due to the fact that we still support jurassic IE versions, some
	// compatibility wrappers are needed.

	var e_preventDefault = CodeMirror.e_preventDefault = function(e) {
	if (e.preventDefault) e.preventDefault();
	else e.returnValue = false;
	};
	var e_stopPropagation = CodeMirror.e_stopPropagation = function(e) {
	if (e.stopPropagation) e.stopPropagation();
	else e.cancelBubble = true;
	};
	function e_defaultPrevented(e) {
	return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;
	}
	var e_stop = CodeMirror.e_stop = function(e) {e_preventDefault(e); e_stopPropagation(e);};

	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

	// Lightweight event framework. on/off also work on DOM nodes,
	// registering native DOM handlers.

	var on = CodeMirror.on = function(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);
	}
	};

	var off = CodeMirror.off = function(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; }
	}
	};

	var signal = CodeMirror.signal = function(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 orphanDelayedCallbacks = null;

	// Often, we want to signal events at a point where we are in the
	// middle of some work, but don't want the handler to start calling
	// other methods on the editor, which might be in an inconsistent
	// state or simply not expect any other events to happen.
	// signalLater looks whether there are any handlers, and schedules
	// them to be executed when the last operation ends, or, if no
	// operation is active, when a timeout fires.
	function signalLater(emitter, type /, values.../) {
	var arr = emitter._handlers && emitter._handlers[type];
	if (!arr) return;
	var args = Array.prototype.slice.call(arguments, 2), list;
	if (operationGroup) {
	list = operationGroup.delayedCallbacks;
	} else if (orphanDelayedCallbacks) {
	list = orphanDelayedCallbacks;
	} else {
	list = orphanDelayedCallbacks = [];
	setTimeout(fireOrphanDelayed, 0);
	}
	function bnd(f) {return function(){f.apply(null, args);};};
	for (var i = 0; i < arr.length; ++i)
	list.push(bnd(arr[i]));
	}

	function fireOrphanDelayed() {
	var delayed = orphanDelayedCallbacks;
	orphanDelayedCallbacks = null;
	for (var i = 0; i < delayed.length; ++i) delayed[i]();
	}

	// The DOM events that CodeMirror handles can be overridden by
	// registering a (non-DOM) handler on the editor for the event name,
	// and preventDefault-ing the event in that handler.
	function signalDOMEvent(cm, e, override) {
	if (typeof e == "string")
	e = {type: e, preventDefault: function() { this.defaultPrevented = true; }};
	signal(cm, override \|\| e.type, cm, e);
	return e_defaultPrevented(e) \|\| e.codemirrorIgnore;
	}

	function signalCursorActivity(cm) {
	var arr = cm._handlers && cm._handlers.cursorActivity;
	if (!arr) return;
	var set = cm.curOp.cursorActivityHandlers \|\| (cm.curOp.cursorActivityHandlers = []);
	for (var i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
	set.push(arr[i]);
	}

	function hasHandler(emitter, type) {
	var arr = emitter._handlers && emitter._handlers[type];
	return arr && arr.length > 0;
	}

	// Add on and off methods to a constructor's prototype, to make
	// registering events on such objects more convenient.
	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 scrollerGap = 30;

	// Returned or thrown by various protocols to signal 'I'm not
	// handling this'.
	var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};

	// Reused option objects for setSelection & friends
	var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};

	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.
	var countColumn = CodeMirror.countColumn = function(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;;) {
	var nextTab = string.indexOf("\t", i);
	if (nextTab < 0 \|\| nextTab >= end)
	return n + (end - i);
	n += nextTab - i;
	n += tabSize - (n % tabSize);
	i = nextTab + 1;
	}
	};

	// The inverse of countColumn -- find the offset that corresponds to
	// a particular column.
	function findColumn(string, goal, tabSize) {
	for (var pos = 0, col = 0;;) {
	var nextTab = string.indexOf("\t", pos);
	if (nextTab == -1) nextTab = string.length;
	var skipped = nextTab - pos;
	if (nextTab == string.length \|\| col + skipped >= goal)
	return pos + Math.min(skipped, goal - col);
	col += nextTab - pos;
	col += tabSize - (col % tabSize);
	pos = nextTab + 1;
	if (col >= goal) return pos;
	}
	}

	var spaceStrs = [""];
	function spaceStr(n) {
	while (spaceStrs.length <= n)
	spaceStrs.push(lst(spaceStrs) + " ");
	return spaceStrs[n];
	}

	function lst(arr) { return arr[arr.length-1]; }

	var selectInput = function(node) { node.select(); };
	if (ios) // Mobile Safari apparently has a bug where select() is broken.
	selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; };
	else if (ie) // Suppress mysterious IE10 errors
	selectInput = function(node) { try { node.select(); } catch(_e) {} };

	function indexOf(array, elt) {
	for (var i = 0; i < array.length; ++i)
	if (array[i] == elt) return i;
	return -1;
	}
	function map(array, f) {
	var out = [];
	for (var i = 0; i < array.length; i++) out[i] = f(array[i], i);
	return out;
	}

	function nothing() {}

	function createObj(base, props) {
	var inst;
	if (Object.create) {
	inst = Object.create(base);
	} else {
	nothing.prototype = base;
	inst = new nothing();
	}
	if (props) copyObj(props, inst);
	return inst;
	};

	function copyObj(obj, target, overwrite) {
	if (!target) target = {};
	for (var prop in obj)
	if (obj.hasOwnProperty(prop) && (overwrite !== false \|\| !target.hasOwnProperty(prop)))
	target[prop] = obj[prop];
	return target;
	}

	function bind(f) {
	var args = Array.prototype.slice.call(arguments, 1);
	return function(){return f.apply(null, args);};
	}

	var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
	var isWordCharBasic = CodeMirror.isWordChar = function(ch) {
	return /\w/.test(ch) \|\| ch > "\x80" &&
	(ch.toUpperCase() != ch.toLowerCase() \|\| nonASCIISingleCaseWordChar.test(ch));
	};
	function isWordChar(ch, helper) {
	if (!helper) return isWordCharBasic(ch);
	if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) return true;
	return helper.test(ch);
	}

	function isEmpty(obj) {
	for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
	return true;
	}

	// Extending unicode characters. A series of a non-extending char +
	// any number of extending chars is treated as a single unit as far
	// as editing and measuring is concerned. This is not fully correct,
	// since some scripts/fonts/browsers also treat other configurations
	// of code points as a group.
	var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
	function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch); }

	// 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") e.appendChild(document.createTextNode(content));
	else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
	return e;
	}

	var range;
	if (document.createRange) range = function(node, start, end, endNode) {
	var r = document.createRange();
	r.setEnd(endNode \|\| node, end);
	r.setStart(node, start);
	return r;
	};
	else range = function(node, start, end) {
	var r = document.body.createTextRange();
	try { r.moveToElementText(node.parentNode); }
	catch(e) { return r; }
	r.collapse(true);
	r.moveEnd("character", end);
	r.moveStart("character", start);
	return r;
	};

	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);
	}

	var contains = CodeMirror.contains = function(parent, child) {
	if (child.nodeType == 3) // Android browser always returns false when child is a textnode
	child = child.parentNode;
	if (parent.contains)
	return parent.contains(child);
	do {
	if (child.nodeType == 11) child = child.host;
	if (child == parent) return true;
	} while (child = child.parentNode);
	};

	function activeElt() {
	var activeElement = document.activeElement;
	while (activeElement && activeElement.root && activeElement.root.activeElement)
	activeElement = activeElement.root.activeElement;
	return activeElement;
	}
	// Older versions of IE throws unspecified error when touching
	// document.activeElement in some cases (during loading, in iframe)
	if (ie && ie_version < 11) activeElt = function() {
	try { return document.activeElement; }
	catch(e) { return document.body; }
	};

	function classTest(cls) { return new RegExp("(^\|\\s)" + cls + "(?:$\|\\s)\\s*"); }
	var rmClass = CodeMirror.rmClass = function(node, cls) {
	var current = node.className;
	var match = classTest(cls).exec(current);
	if (match) {
	var after = current.slice(match.index + match[0].length);
	node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
	}
	};
	var addClass = CodeMirror.addClass = function(node, cls) {
	var current = node.className;
	if (!classTest(cls).test(current)) node.className += (current ? " " : "") + cls;
	};
	function joinClasses(a, b) {
	var as = a.split(" ");
	for (var i = 0; i < as.length; i++)
	if (as[i] && !classTest(as[i]).test(b)) b += " " + as[i];
	return b;
	}

	// WINDOW-WIDE EVENTS

	// These must be handled carefully, because naively registering a
	// handler for each editor will cause the editors to never be
	// garbage collected.

	function forEachCodeMirror(f) {
	if (!document.body.getElementsByClassName) return;
	var byClass = document.body.getElementsByClassName("CodeMirror");
	for (var i = 0; i < byClass.length; i++) {
	var cm = byClass[i].CodeMirror;
	if (cm) f(cm);
	}
	}

	var globalsRegistered = false;
	function ensureGlobalHandlers() {
	if (globalsRegistered) return;
	registerGlobalHandlers();
	globalsRegistered = true;
	}
	function registerGlobalHandlers() {
	// When the window resizes, we need to refresh active editors.
	var resizeTimer;
	on(window, "resize", function() {
	if (resizeTimer == null) resizeTimer = setTimeout(function() {
	resizeTimer = null;
	forEachCodeMirror(onResize);
	}, 100);
	});
	// When the window loses focus, we want to show the editor as blurred
	on(window, "blur", function() {
	forEachCodeMirror(onBlur);
	});
	}

	// 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 && ie_version < 9) return false;
	var div = elt('div');
	return "draggable" in div \|\| "dragDrop" in div;
	}();

	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 && ie_version < 8);
	}
	var node = zwspSupported ? elt("span", "\u200b") :
	elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
	node.setAttribute("cm-text", "");
	return node;
	}

	// Feature-detect IE's crummy client rect reporting for bidi text
	var badBidiRects;
	function hasBadBidiRects(measure) {
	if (badBidiRects != null) return badBidiRects;
	var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
	var r0 = range(txt, 0, 1).getBoundingClientRect();
	if (!r0 \|\| r0.left == r0.right) return false; // Safari returns null in some cases (#2780)
	var r1 = range(txt, 1, 2).getBoundingClientRect();
	return badBidiRects = (r1.right - r0.right < 3);
	}

	// See if "".split is the broken IE version, if so, provide an
	// alternative way to split lines.
	var splitLinesAuto = CodeMirror.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/);};

	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";
	})();

	var badZoomedRects = null;
	function hasBadZoomedRects(measure) {
	if (badZoomedRects != null) return badZoomedRects;
	var node = removeChildrenAndAdd(measure, elt("span", "x"));
	var normal = node.getBoundingClientRect();
	var fromRange = range(node, 0, 1).getBoundingClientRect();
	return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1;
	}

	// KEY NAMES

	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: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod", 107: "=", 109: "-", 127: "Delete",
	173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
	221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
	63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"};
	CodeMirror.keyNames = keyNames;
	(function() {
	// Number keys
	for (var i = 0; i < 10; i++) keyNames[i + 48] = keyNames[i + 96] = 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(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 = getLine(cm.doc, lineN);
	while (merged = collapsedSpanAtEnd(line)) {
	line = merged.find(1, true).line;
	lineN = null;
	}
	var order = getOrder(line);
	var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
	return Pos(lineN == null ? lineNo(line) : lineN, ch);
	}
	function lineStartSmart(cm, pos) {
	var start = lineStart(cm, pos.line);
	var line = getLine(cm.doc, start.line);
	var order = getOrder(line);
	if (!order \|\| order[0].level == 0) {
	var firstNonWS = Math.max(0, line.text.search(/\S/));
	var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
	return Pos(start.line, inWS ? 0 : firstNonWS);
	}
	return start;
	}

	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) {
	bidiOther = null;
	for (var i = 0, found; i < order.length; ++i) {
	var cur = order[i];
	if (cur.from < pos && cur.to > pos) return i;
	if ((cur.from == pos \|\| cur.to == pos)) {
	if (found == null) {
	found = i;
	} else if (compareBidiLevel(order, cur.level, order[found].level)) {
	if (cur.from != cur.to) bidiOther = found;
	return i;
	} else {
	if (cur.from != cur.to) bidiOther = i;
	return found;
	}
	}
	}
	return found;
	}

	function moveInLine(line, pos, dir, byUnit) {
	if (!byUnit) return pos + dir;
	do pos += dir;
	while (pos > 0 && isExtendingChar(line.text.charAt(pos)));
	return pos;
	}

	// This 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(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%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
	// Character types for codepoints 0x600 to 0x6ff
	var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmm";
	function charType(code) {
	if (code <= 0xf7) return lowTypes.charAt(code);
	else if (0x590 <= code && code <= 0x5f4) return "R";
	else if (0x600 <= code && code <= 0x6ed) return arabicTypes.charAt(code - 0x600);
	else if (0x6ee <= code && code <= 0x8ac) return "r";
	else if (0x2000 <= code && code <= 0x200b) return "w";
	else if (code == 0x200c) return "b";
	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";

	function BidiSpan(level, from, to) {
	this.level = level;
	this.from = from; this.to = to;
	}

	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 && 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 ? 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(new BidiSpan(0, start, i));
	} 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, new BidiSpan(1, pos, j));
	var nstart = j;
	for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
	order.splice(at, 0, new BidiSpan(2, nstart, j));
	pos = j;
	} else ++j;
	}
	if (pos < i) order.splice(at, 0, new BidiSpan(1, pos, i));
	}
	}
	if (order[0].level == 1 && (m = str.match(/^\s+/))) {
	order[0].from = m[0].length;
	order.unshift(new BidiSpan(0, 0, m[0].length));
	}
	if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
	lst(order).to -= m[0].length;
	order.push(new BidiSpan(0, len - m[0].length, len));
	}
	if (order[0].level == 2)
	order.unshift(new BidiSpan(1, order[0].to, order[0].to));
	if (order[0].level != lst(order).level)
	order.push(new BidiSpan(order[0].level, len, len));

	return order;
	};
	})();

	// THE END

	CodeMirror.version = "5.5.1";

	return CodeMirror;
	});

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