/
codemirror.js
4026 lines (3653 loc) · 156 KB
/
codemirror.js
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// CodeMirror is the only global var we claim
window.CodeMirror = (function() {
"use strict";
// BROWSER SNIFFING
// Crude, but necessary to handle a number of hard-to-feature-detect
// bugs and behavior differences.
var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
var ie = /MSIE \d/.test(navigator.userAgent);
var ie_lt8 = /MSIE [1-7]\b/.test(navigator.userAgent);
var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
var webkit = /WebKit\//.test(navigator.userAgent);
var chrome = /Chrome\//.test(navigator.userAgent);
var opera = /Opera\//.test(navigator.userAgent);
var safari = /Apple Computer/.test(navigator.vendor);
var khtml = /KHTML\//.test(navigator.userAgent);
var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);
var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
var mac = ios || /Mac/.test(navigator.platform);
var win = /Win/.test(navigator.platform);
// CONSTRUCTOR
function CodeMirror(place, options) {
if (!(this instanceof CodeMirror)) return new CodeMirror(place, options, true);
this.options = options = options || {};
// Determine effective options based on given values and defaults.
for (var opt in defaults) if (!options.hasOwnProperty(opt) && defaults.hasOwnProperty(opt))
options[opt] = defaults[opt];
setGuttersForLineNumbers(options);
var display = this.display = makeDisplay(place);
display.wrapper.CodeMirror = this;
updateGutters(this);
themeChanged(this);
keyMapChanged(this);
if (options.tabindex != null) display.input.tabIndex = options.tabindex;
if (options.autofocus) focusInput(this);
if (options.lineWrapping) display.wrapper.className += " CodeMirror-wrap";
var doc = new BranchChunk([new LeafChunk([new Line("", null, textHeight(display))])]);
// frontier is the point up to which the content has been parsed,
doc.frontier = 0;
doc.highlight = new Delayed();
doc.tabSize = options.tabSize;
// The selection. These are always maintained to point at valid
// positions. Inverted is used to remember that the user is
// selecting bottom-to-top.
this.view = {
doc: doc,
sel: {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false, shift: false},
scrollTop: 0, scrollLeft: 0,
overwrite: false, focused: false,
// Tracks the maximum line length so that
// the horizontal scrollbar can be kept
// static when scrolling.
maxLine: getLine(doc, 0),
maxLineChanged: false,
suppressEdits: false,
goalColumn: null
};
loadMode(this);
// Initialize the content.
this.setValue(options.value || "");
doc.history = new History();
registerEventHandlers(this);
// IE throws unspecified error in certain cases, when
// trying to access activeElement before onload
var hasFocus; try { hasFocus = (document.activeElement == display.input); } catch(e) { }
if (hasFocus || options.autofocus) setTimeout(bind(onFocus, this), 20);
else onBlur(this);
for (var opt in optionHandlers)
if (optionHandlers.propertyIsEnumerable(opt))
optionHandlers[opt](this, options[opt]);
}
// DISPLAY CONSTRUCTOR
function makeDisplay(place) {
var d = {};
var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none;");
input.setAttribute("wrap", "off"); input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off");
// Wraps and hides input textarea
d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
// The actual fake scrollbars.
d.scrollbarH = elt("div", [elt("div", null, null, "height: 1px")], "CodeMirror-hscrollbar");
d.scrollbarV = elt("div", [elt("div", null, null, "width: 1px")], "CodeMirror-vscrollbar");
d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
// DIVs containing the selection and the actual code
d.lineDiv = elt("div");
d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
// Blinky cursor, and element used to ensure cursor fits at the end of a line
d.cursor = elt("pre", "\u00a0", "CodeMirror-cursor");
// Secondary cursor, shown when on a 'jump' in bi-directional text
d.otherCursor = elt("pre", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor");
// Used to measure text size
d.measure = elt("div", null, "CodeMirror-measure");
// Wraps everything that needs to exist inside the vertically-padded coordinate system
d.lineSpace = elt("div", [d.measure, d.cursor, d.otherCursor, d.selectionDiv, 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");
d.gutters = elt("div", null, "CodeMirror-gutters");
d.lineGutter = null;
// Set to the height of the text, causes scrolling
d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
// D is needed because behavior of elts with overflow: auto and padding is inconsistent across browsers
d.heightForcer = elt("div", "\u00a0", null, "position: absolute; height: " + scrollerCutOff + "px");
// Provides scrolling
d.scroller = elt("div", [d.sizer, d.heightForcer], "CodeMirror-scroll");
d.scroller.setAttribute("tabIndex", "-1");
// The element in which the editor lives.
d.wrapper = elt("div", [d.gutters, d.inputDiv, d.scrollbarH, d.scrollbarV,
d.scrollbarFiller, d.scroller], "CodeMirror");
// Work around IE7 z-index bug
if (ie_lt8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
if (place.appendChild) place.appendChild(d.wrapper); else place(d.wrapper);
// Needed to hide big blue blinking cursor on Mobile Safari
if (ios) input.style.width = "0px";
if (!webkit) d.scroller.draggable = true;
// Needed to handle Tab key in KHTML
if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }
// Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
else if (ie_lt8) d.scrollbarH.style.minWidth = d.scrollbarV.style.minWidth = "18px";
// Current visible range (may be bigger than the view window).
d.viewOffset = d.showingFrom = d.showingTo = d.lastSizeC = 0;
// Used to only resize the line number gutter when necessary (when
// the amount of lines crosses a boundary that makes its width change)
d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
// See readInput and resetInput
d.prevInput = "";
// Set to true when a non-horizontal-scrolling widget is added. As
// an optimization, widget aligning is skipped when d is false.
d.alignWidgets = false;
// Flag that indicates whether we currently expect input to appear
// (after some event like 'keypress' or 'input') and are polling
// intensively.
d.pollingFast = false;
// Self-resetting timeout for the poller
d.poll = new Delayed();
// True when a drag from the editor is active
d.draggingText = false;
d.cachedCharWidth = d.cachedTextHeight = null;
d.measureLineCache = [];
d.measureLineCache.pos = 0;
// Tracks when resetInput has punted to just putting a short
// string instead of the (large) selection.
d.inaccurateSelection = false;
// Used to adjust overwrite behaviour when a paste has been
// detected
d.pasteIncoming = false;
return d;
}
// STATE UPDATES
// Used to get the editor into a consistent state again when options change.
function loadMode(cm) {
var doc = cm.view.doc;
doc.mode = CodeMirror.getMode(cm.options, cm.options.mode);
doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
doc.frontier = 0;
startWorker(cm, 100);
}
function wrappingChanged(cm) {
var doc = cm.view.doc;
if (cm.options.lineWrapping) {
cm.display.wrapper.className += " CodeMirror-wrap";
var perLine = cm.display.wrapper.clientWidth / charWidth(cm.display) - 3;
doc.iter(0, doc.size, function(line) {
if (line.hidden) return;
var guess = Math.ceil(line.text.length / perLine) || 1;
if (guess != 1) updateLineHeight(line, guess);
});
cm.display.sizer.style.minWidth = "";
} else {
cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-wrap", "");
computeMaxLength(cm.view);
doc.iter(0, doc.size, function(line) {
if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
});
}
regChange(cm, 0, doc.size);
}
function keyMapChanged(cm) {
var style = keyMap[cm.options.keyMap].style;
cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
(style ? " cm-keymap-" + style : "");
}
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-");
}
function guttersChanged(cm) {
updateGutters(cm);
updateDisplay(cm, true);
}
function updateGutters(cm) {
var gutters = cm.display.gutters, specs = cm.options.gutters;
removeChildren(gutters);
for (var i = 0; i < specs.length; ++i) {
var gutterClass = specs[i];
var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
if (gutterClass == "CodeMirror-linenumbers") {
cm.display.lineGutter = gElt;
gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
}
}
gutters.style.display = i ? "" : "none";
}
function computeMaxLength(view) {
view.maxLine = getLine(view.doc, 0); view.maxLineChanged = true;
var maxLineLength = view.maxLine.text.length;
view.doc.iter(1, view.doc.size, function(line) {
var l = line.text;
if (!line.hidden && l.length > maxLineLength) {
maxLineLength = l.length; view.maxLine = line;
}
});
}
// Make sure the gutters options contains the element
// "CodeMirror-linenumbers" when the lineNumbers option is true.
function setGuttersForLineNumbers(options) {
var found = false;
for (var i = 0; i < options.gutters.length; ++i) {
if (options.gutters[i] == "CodeMirror-linenumbers") {
if (options.lineNumbers) found = true;
else options.gutters.splice(i--, 1);
}
}
if (!found && options.lineNumbers)
options.gutters.push("CodeMirror-linenumbers");
}
// SCROLLBARS
// Re-synchronize the fake scrollbars with the actual size of the
// content. Optionally force a scrollTop.
function updateScrollbars(d /* display */, docHeight, scrollTop) {
d.sizer.style.minHeight = d.heightForcer.style.top = (docHeight + 2 * paddingTop(d)) + "px";
var needsH = d.scroller.scrollWidth > d.scroller.clientWidth;
var needsV = d.scroller.scrollHeight > d.scroller.clientHeight;
if (needsV) {
d.scrollbarV.style.display = "block";
d.scrollbarV.style.bottom = needsH ? scrollbarWidth(d.measure) + "px" : "0";
d.scrollbarV.firstChild.style.height =
(d.scroller.scrollHeight - d.scroller.clientHeight + d.scrollbarV.clientHeight) + "px";
if (scrollTop != null) {
d.scrollbarV.scrollTop = d.scroller.scrollTop = scrollTop;
// 'Nudge' the scrollbar to work around a Webkit bug where,
// in some situations, we'd end up with a scrollbar that
// reported its scrollTop (and looked) as expected, but
// *behaved* as if it was still in a previous state (i.e.
// couldn't scroll up, even though it appeared to be at the
// bottom).
if (webkit) setTimeout(function() {
if (d.scrollbarV.scrollTop != scrollTop) return;
d.scrollbarV.scrollTop = scrollTop + (scrollTop ? -1 : 1);
d.scrollbarV.scrollTop = scrollTop;
}, 0);
}
} else d.scrollbarV.style.display = "";
if (needsH) {
d.scrollbarH.style.display = "block";
d.scrollbarH.style.right = needsV ? scrollbarWidth(d.measure) + "px" : "0";
d.scrollbarH.firstChild.style.width =
(d.scroller.scrollWidth - d.scroller.clientWidth + d.scrollbarH.clientWidth) + "px";
} else d.scrollbarH.style.display = "";
if (needsH && needsV) {
d.scrollbarFiller.style.display = "block";
d.scrollbarFiller.style.height = d.scrollbarFiller.style.width = scrollbarWidth(d.measure) + "px";
} else d.scrollbarFiller.style.display = "";
if (mac_geLion && scrollbarWidth(d.measure) === 0)
d.scrollbarV.style.minWidth = d.scrollbarH.style.minHeight = "12px";
}
function visibleLines(display, doc, scrollTop) {
var top = (scrollTop != null ? scrollTop : display.scroller.scrollTop) - paddingTop(display);
var fromHeight = Math.max(0, Math.floor(top));
var toHeight = Math.ceil(top + display.wrapper.clientHeight);
return {from: lineAtHeight(doc, fromHeight),
to: lineAtHeight(doc, toHeight)};
}
// LINE NUMBERS
function alignVertically(display) {
if (!display.alignWidgets && !display.gutters.firstChild) return;
var l = compensateForHScroll(display) + "px";
for (var n = display.lineDiv.firstChild; n; n = n.nextSibling) if (n.alignable) {
for (var i = 0, a = n.alignable; i < a.length; ++i) a[i].style.left = l;
}
}
function maybeUpdateLineNumberWidth(cm) {
if (!cm.options.lineNumbers) return false;
var doc = cm.view.doc, last = lineNumberFor(cm.options, doc.size - 1), display = cm.display;
if (last.length != display.lineNumChars) {
var test = display.measure.appendChild(elt("div", [elt("div", last)],
"CodeMirror-linenumber CodeMirror-gutter-elt"));
var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
display.lineGutter.style.width = "";
display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);
display.lineNumWidth = display.lineNumInnerWidth + padding;
display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
display.lineGutter.style.width = display.lineNumWidth + "px";
return true;
}
return false;
}
function lineNumberFor(options, i) {
return String(options.lineNumberFormatter(i + options.firstLineNumber));
}
function compensateForHScroll(display) {
return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left;
}
// DISPLAY DRAWING
function updateDisplay(cm, changes, scrollTop) {
var oldFrom = cm.display.showingFrom, oldTo = cm.display.showingTo;
var updated = updateDisplayInner(cm, changes, scrollTop);
if (updated) {
signalLater(cm, cm, "update", cm);
if (cm.display.showingFrom != oldFrom || cm.display.showingTo != oldTo)
signalLater(cm, cm, "viewportChange", cm, cm.display.showingFrom, cm.display.showingTo);
}
updateSelection(cm);
updateScrollbars(cm.display, cm.view.doc.height, scrollTop);
return updated;
}
// Uses a set of changes plus the current scroll position to
// determine which DOM updates have to be made, and makes the
// updates.
function updateDisplayInner(cm, changes, scrollTop) {
var display = cm.display, doc = cm.view.doc;
if (!display.wrapper.clientWidth) {
display.showingFrom = display.showingTo = display.viewOffset = 0;
return;
}
// Compute the new visible window
// If scrollTop is specified, use that to determine which lines
// to render instead of the current scrollbar position.
var visible = visibleLines(display, doc, scrollTop);
// Bail out if the visible area is already rendered and nothing changed.
if (changes !== true && changes.length == 0 &&
visible.from > display.showingFrom && visible.to < display.showingTo)
return;
if (changes && maybeUpdateLineNumberWidth(cm))
changes = true;
display.sizer.style.marginLeft = display.scrollbarH.style.left = display.gutters.offsetWidth + "px";
// Used to determine which lines need their line numbers updated
var positionsChangedFrom = changes === true ? 0 : Infinity;
if (cm.options.lineNumbers && changes && changes !== true)
for (var i = 0; i < changes.length; ++i)
if (changes[i].diff) { positionsChangedFrom = changes[i].from; break; }
var from = Math.max(visible.from - cm.options.viewportMargin, 0);
var to = Math.min(doc.size, visible.to + cm.options.viewportMargin);
if (display.showingFrom < from && from - display.showingFrom < 20) from = display.showingFrom;
if (display.showingTo > to && display.showingTo - to < 20) to = Math.min(doc.size, display.showingTo);
// Create a range of theoretically intact lines, and punch holes
// in that using the change info.
var intact = changes === true ? [] :
computeIntact([{from: display.showingFrom, to: display.showingTo, domStart: 0}], changes);
// Clip off the parts that won't be visible
var intactLines = 0;
for (var i = 0; i < intact.length; ++i) {
var range = intact[i];
if (range.from < from) {range.domStart += (from - range.from); range.from = from;}
if (range.to > to) range.to = to;
if (range.from >= range.to) intact.splice(i--, 1);
else intactLines += range.to - range.from;
}
if (intactLines == to - from && from == display.showingFrom && to == display.showingTo)
return;
intact.sort(function(a, b) {return a.domStart - b.domStart;});
display.lineDiv.style.display = "none";
patchDisplay(cm, from, to, intact, positionsChangedFrom);
display.lineDiv.style.display = "";
var different = from != display.showingFrom || to != display.showingTo ||
display.lastSizeC != display.wrapper.clientHeight;
// This is just a bogus formula that detects when the editor is
// resized or the font size changes.
if (different) display.lastSizeC = display.wrapper.clientHeight;
display.showingFrom = from; display.showingTo = to;
display.viewOffset = heightAtLine(doc, from);
startWorker(cm, 100);
// Since this is all rather error prone, it is honoured with the
// only assertion in the whole file.
if (display.lineDiv.childNodes.length != display.showingTo - display.showingFrom)
throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (display.showingTo - display.showingFrom) +
" nodes=" + display.lineDiv.childNodes.length);
// Update line heights for visible lines based on actual DOM
// sizes
var curNode = display.lineDiv.firstChild, heightChanged = false;
var relativeTo = curNode.offsetTop;
doc.iter(display.showingFrom, display.showingTo, function(line) {
// Work around bizarro IE7 bug where, sometimes, our curNode
// is magically replaced with a new node in the DOM, leaving
// us with a reference to an orphan (nextSibling-less) node.
if (!curNode) return;
if (!line.hidden || (line.hidden.handle.showWidgets && line.widgets)) {
var end = curNode.offsetHeight + curNode.offsetTop;
var height = end - relativeTo, diff = line.height - height;
if (height < 2) height = textHeight(display);
relativeTo = end;
if (diff > .001 || diff < -.001) {
updateLineHeight(line, height);
heightChanged = true;
}
}
curNode = curNode.nextSibling;
});
// Position the mover div to align with the current virtual scroll position
display.mover.style.top = display.viewOffset + "px";
return true;
}
function computeIntact(intact, changes) {
for (var i = 0, l = changes.length || 0; i < l; ++i) {
var change = changes[i], intact2 = [], diff = change.diff || 0;
for (var j = 0, l2 = intact.length; j < l2; ++j) {
var range = intact[j];
if (change.to <= range.from && change.diff)
intact2.push({from: range.from + diff, to: range.to + diff,
domStart: range.domStart});
else if (change.to <= range.from || change.from >= range.to)
intact2.push(range);
else {
if (change.from > range.from)
intact2.push({from: range.from, to: change.from, domStart: range.domStart});
if (change.to < range.to)
intact2.push({from: change.to + diff, to: range.to + diff,
domStart: range.domStart + (change.to - range.from)});
}
}
intact = intact2;
}
return intact;
}
function patchDisplay(cm, from, to, intact, updateNumbersFrom) {
function killNode(node) {
var tmp = node.nextSibling;
node.parentNode.removeChild(node);
return tmp;
}
var display = cm.display, lineNumbers = cm.options.lineNumbers;
// The first pass removes the DOM nodes that aren't intact.
if (!intact.length) removeChildren(display.lineDiv);
else {
var domPos = 0, curNode = display.lineDiv.firstChild, n;
for (var i = 0; i < intact.length; ++i) {
var cur = intact[i];
while (cur.domStart > domPos) {curNode = killNode(curNode); domPos++;}
for (var j = cur.from, e = cur.to; j < e; ++j) {
if (lineNumbers && updateNumbersFrom <= j && curNode.firstChild)
setTextContent(curNode.firstChild.firstChild, lineNumberFor(cm.options, j));
curNode = curNode.nextSibling; domPos++;
}
}
while (curNode) curNode = killNode(curNode);
}
// This pass fills in the lines that actually changed.
var nextIntact = intact.shift(), curNode = display.lineDiv.firstChild;
var j = from, gutterSpecs = cm.options.gutters;
var fixedPos = compensateForHScroll(display);
cm.view.doc.iter(from, to, function(line) {
if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
if (!nextIntact || nextIntact.from > j) {
if (line.hidden && (!line.hidden.handle.showWidgets || !line.widgets)) {
var lineElement = elt("div");
} else {
var lineElement = line.hidden ? elt("div") : lineContent(cm, line);
var markers = line.gutterMarkers;
if (line.className) lineElement.className = line.className;
// Lines with gutter elements or a background class need
// to be wrapped again, and have the extra elements added
// to the wrapper div
if (lineNumbers || markers || line.bgClassName || (line.widgets && line.widgets.length)) {
var wrap = elt("div", null, null, "position: relative");
if (lineNumbers || markers) {
var gutterWrap = wrap.appendChild(elt("div", null, null,
"position: absolute; left: " + fixedPos + "px"));
wrap.alignable = [gutterWrap];
if (lineNumbers)
gutterWrap.appendChild(elt("div", lineNumberFor(cm.options, j),
"CodeMirror-linenumber CodeMirror-gutter-elt",
"left: " + display.lineGutter.offsetLeft + "px; width: "
+ display.lineNumInnerWidth + "px"));
if (markers)
for (var k = 0; k < gutterSpecs.length; ++k) {
var id = gutterSpecs[k], found = markers.hasOwnProperty(id) && markers[id];
if (found) {
var gutterElt = display.gutters.childNodes[k];
gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
gutterElt.offsetLeft + "px; width: " + gutterElt.clientWidth + "px"));
}
}
}
// Kludge to make sure the styled element lies behind the selection (by z-index)
if (line.bgClassName)
wrap.appendChild(elt("div", "\u00a0", line.bgClassName + " CodeMirror-linebackground"));
wrap.appendChild(lineElement);
if (line.widgets)
for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
node.widget = widget;
if (widget.noHScroll) {
(wrap.alignable || (wrap.alignable = [])).push(node);
var width = display.wrapper.clientWidth;
node.style.left = fixedPos + "px";
if (!widget.coverGutter) {
width -= display.gutters.offsetWidth;
node.style.paddingLeft = display.gutters.offsetWidth + "px";
}
node.style.width = width + "px";
}
if (widget.coverGutter) {
node.style.zIndex = 5;
node.style.position = "relative";
if (!widget.noHScroll) node.style.marginLeft = -display.gutters.offsetWidth + "px";
}
wrap.appendChild(node);
}
lineElement = wrap;
if (ie_lt8) lineElement.style.zIndex = 2;
}
}
display.lineDiv.insertBefore(lineElement, curNode);
} else {
curNode = curNode.nextSibling;
}
++j;
});
}
// SELECTION / CURSOR
function selHead(view) {
return view.sel.inverted ? view.sel.from : view.sel.to;
}
function updateSelection(cm) {
var headPos, display = cm.display, doc = cm.view.doc, sel = cm.view.sel;
if (posEq(sel.from, sel.to)) { // No selection, single cursor
var pos = headPos = cursorCoords(cm, sel.from, "div");
display.cursor.style.left = pos.left + "px";
display.cursor.style.top = pos.top + "px";
display.cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
display.cursor.style.display = "";
display.selectionDiv.style.display = "none";
if (pos.other) {
display.otherCursor.style.display = "";
display.otherCursor.style.left = pos.other.left + "px";
display.otherCursor.style.top = pos.other.top + "px";
display.otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
} else { display.otherCursor.style.display = "none"; }
} else {
headPos = cursorCoords(cm, selHead(cm.view), "div");
var fragment = document.createDocumentFragment();
var clientWidth = display.lineSpace.offsetWidth;
var add = function(left, top, width, bottom) {
if (top < 0) top = 0;
fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
"px; top: " + top + "px; width: " + (width == null ? clientWidth : width) +
"px; height: " + (bottom - top) + "px"));
};
var middleFrom = sel.from.line + 1, middleTo = sel.to.line - 1, sameLine = sel.from.line == sel.to.line;
var drawForLine = function(line, from, toArg, retTop) {
var lineObj = getLine(doc, line), lineLen = lineObj.text.length;
var coords = function(ch) { return charCoords(cm, {line: line, ch: ch}, "div", lineObj); };
var rVal = retTop ? Infinity : -Infinity;
iterateBidiSections(getOrder(lineObj), from, toArg == null ? lineLen : toArg, function(from, to, dir) {
var leftPos = coords(dir == "rtl" ? to - 1 : from);
var rightPos = coords(dir == "rtl" ? from : to - 1);
var left = leftPos.left, right = rightPos.right;
if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
add(left, leftPos.top, null, leftPos.bottom);
left = paddingLeft(display);
if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
}
if (toArg == null && to == lineLen) right = clientWidth;
rVal = retTop ? Math.min(rightPos.top, rVal) : Math.max(rightPos.bottom, rVal);
add(left, rightPos.top, right - left, rightPos.bottom);
});
return rVal;
};
var middleTop = Infinity, middleBot = -Infinity;
if (sel.from.ch || sameLine)
// Draw the first line of selection.
middleTop = drawForLine(sel.from.line, sel.from.ch, sameLine ? sel.to.ch : null);
else
// Simply include it in the middle block.
middleFrom = sel.from.line;
if (!sameLine && sel.to.ch)
middleBot = drawForLine(sel.to.line, 0, sel.to.ch, true);
if (middleFrom <= middleTo) {
// Draw the middle
var botLine = getLine(doc, middleTo),
bottom = charCoords(cm, {line: middleTo, ch: botLine.text.length}, "div", botLine);
// Kludge to try and prevent fetching coordinates twice if
// start end end are on same line.
var top = (middleFrom != middleTo || botLine.height > bottom.bottom - bottom.top) ?
charCoords(cm, {line: middleFrom, ch: 0}, "div") : bottom;
middleTop = Math.min(middleTop, top.top);
middleBot = Math.max(middleBot, bottom.bottom);
}
if (middleTop < middleBot) add(paddingLeft(display), middleTop, null, middleBot);
removeChildrenAndAdd(display.selectionDiv, fragment);
display.cursor.style.display = display.otherCursor.style.display = "none";
display.selectionDiv.style.display = "";
}
// Move the hidden textarea near the cursor to prevent scrolling artifacts
var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
display.inputDiv.style.top = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
headPos.top + lineOff.top - wrapOff.top)) + "px";
display.inputDiv.style.left = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
headPos.left + lineOff.left - wrapOff.left)) + "px";
}
// Cursor-blinking
function restartBlink(cm) {
var display = cm.display;
clearInterval(display.blinker);
var on = true;
display.cursor.style.visibility = display.otherCursor.style.visibility = "";
display.blinker = setInterval(function() {
display.cursor.style.visibility = display.otherCursor.style.visibility = (on = !on) ? "" : "hidden";
}, cm.options.cursorBlinkRate);
}
// HIGHLIGHT WORKER
function startWorker(cm, time) {
if (cm.view.doc.frontier < cm.display.showingTo)
cm.view.doc.highlight.set(time, bind(highlightWorker, cm));
}
function highlightWorker(cm) {
var doc = cm.view.doc;
if (doc.frontier >= cm.display.showingTo) return;
var end = +new Date + cm.options.workTime;
var state = copyState(doc.mode, getStateBefore(doc, doc.frontier));
var startFrontier = doc.frontier;
doc.iter(doc.frontier, cm.display.showingTo, function(line) {
if (doc.frontier >= cm.display.showingFrom) { // Visible
line.highlight(doc.mode, state, cm.options.tabSize);
line.stateAfter = copyState(doc.mode, state);
} else {
line.process(doc.mode, state, cm.options.tabSize);
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 (cm.display.showingTo > startFrontier && doc.frontier >= cm.display.showingFrom)
operation(cm, function() {regChange(this, startFrontier, doc.frontier);})();
}
// 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(doc, n) {
var minindent, minline;
for (var search = n, lim = n - 100; search > lim; --search) {
if (search == 0) return 0;
var line = getLine(doc, search-1);
if (line.stateAfter) return search;
var indented = line.indentation(doc.tabSize);
if (minline == null || minindent > indented) {
minline = search - 1;
minindent = indented;
}
}
return minline;
}
function getStateBefore(doc, n) {
var pos = findStartLine(doc, n), state = pos && getLine(doc, pos-1).stateAfter;
if (!state) state = startState(doc.mode);
else state = copyState(doc.mode, state);
doc.iter(pos, n, function(line) {
line.process(doc.mode, state, doc.tabSize);
line.stateAfter = (pos == n - 1 || pos % 5 == 0) ? copyState(doc.mode, state) : null;
});
return state;
}
// POSITION MEASUREMENT
function paddingTop(display) {return display.lineSpace.offsetTop;}
function paddingLeft(display) {
var e = removeChildrenAndAdd(display.measure, elt("pre")).appendChild(elt("span", "x"));
return e.offsetLeft;
}
function measureLine(cm, line, ch) {
var wrapping = cm.options.lineWrapping, display = cm.display;
// First look in the cache
var cache = cm.display.measureLineCache;
for (var i = 0; i < cache.length; ++i) {
var memo = cache[i];
if (memo.ch == ch && memo.text == line.text &&
(!wrapping || display.scroller.clientWidth == memo.width))
return {top: memo.top, bottom: memo.bottom, left: memo.left, right: memo.right};
}
var atEnd = ch && ch == line.text.length;
var pre = lineContent(cm, line, atEnd ? ch - 1 : ch);
removeChildrenAndAdd(display.measure, pre);
var anchor = pre.anchor;
// We'll sample once at the top, once at the bottom of the line,
// to get the real line height (in case there tokens on the line
// with bigger fonts)
anchor.style.verticalAlign = "top";
var outer = display.lineDiv.getBoundingClientRect(), box1 = anchor.getBoundingClientRect();
var left = box1.left - outer.left, right = box1.right - outer.left;
if (ie) {
var left1 = anchor.offsetLeft;
// In IE, verticalAlign does not influence offsetTop, unless
// the element is an inline-block. Unfortunately, inline
// blocks have different wrapping behaviour, so we have to do
// some icky thing with inserting "Zero-Width No-Break Spaces"
// to compensate for wrapping artifacts.
anchor.style.display = "inline-block";
if (wrapping && anchor.offsetLeft != left1) {
anchor.parentNode.insertBefore(document.createTextNode("\ufeff"), anchor);
if (anchor.offsetLeft != left1)
anchor.parentNode.insertBefore(document.createTextNode("\ufeff"), anchor.nextSibling);
if (anchor.offsetLeft != left1)
anchor.parentNode.removeChild(anchor.previousSibling);
}
}
var top = Math.max(0, box1.top - outer.top);
anchor.style.verticalAlign = "bottom";
var bottom = Math.min(anchor.getBoundingClientRect().bottom - outer.top, pre.offsetHeight);
if (atEnd) left = right;
// Store result in the cache
var memo = {ch: ch, text: line.text, width: display.wrapper.clientWidth,
top: top, bottom: bottom, left: left, right: right};
if (cache.length == 8) cache[++cache.pos % 8] = memo;
else cache.push(memo);
return {top: top, bottom: bottom, left: left, right: right};
}
// Context is one of "line", "div" (display.lineDiv), "local"/null (editor), or "page"
function intoCoordSystem(cm, pos, rect, context) {
if (context == "line") return rect;
if (!context) context = "local";
var yOff = heightAtLine(cm.view.doc, pos.line);
if (context != "local") yOff -= cm.display.viewOffset;
if (context == "page") {
var lOff = cm.display.lineSpace.getBoundingClientRect();
yOff += lOff.top + (window.pageYOffset || (document.documentElement || document.body).scrollTop);
var xOff = lOff.left + (window.pageXOffset || (document.documentElement || document.body).scrollLeft);
rect.left += xOff; rect.right += xOff;
}
rect.top += yOff; rect.bottom += yOff;
return rect;
}
function charCoords(cm, pos, context, lineObj) {
if (!lineObj) lineObj = getLine(cm.view.doc, pos.line);
return intoCoordSystem(cm, pos, measureLine(cm, lineObj, pos.ch), context);
}
function cursorCoords(cm, pos, context, lineObj) {
lineObj = lineObj || getLine(cm.view.doc, pos.line);
function get(ch, right) {
var m = measureLine(cm, lineObj, ch);
if (right) m.left = m.right; else m.right = m.left;
return intoCoordSystem(cm, pos, m, context);
}
var order = getOrder(lineObj), ch = pos.ch;
if (!order) return get(ch);
var main, other, linedir = order[0].level;
for (var i = 0; i < order.length; ++i) {
var part = order[i], rtl = part.level % 2, nb, here;
if (part.from < ch && part.to > ch) return get(ch, rtl);
var left = rtl ? part.to : part.from, right = rtl ? part.from : part.to;
if (left == ch) {
// Opera and IE return bogus offsets and widths for edges
// where the direction flips, but only for the side with the
// lower level. So we try to use the side with the higher
// level.
if (i && part.level < (nb = order[i-1]).level) here = get(nb.level % 2 ? nb.from : nb.to - 1, true);
else here = get(rtl && part.from != part.to ? ch - 1 : ch);
if (rtl == linedir) main = here; else other = here;
} else if (right == ch) {
var nb = i < order.length - 1 && order[i+1];
if (!rtl && nb && nb.from == nb.to) continue;
if (nb && part.level < nb.level) here = get(nb.level % 2 ? nb.to - 1 : nb.from);
else here = get(rtl ? ch : ch - 1, true);
if (rtl == linedir) main = here; else other = here;
}
}
if (linedir && !ch) other = get(order[0].to - 1);
if (!main) return other;
if (other) main.other = other;
return main;
}
// Coords must be lineSpace-local
function coordsChar(cm, x, y) {
var display = cm.display, doc = cm.view.doc;
var cw = charWidth(display), heightPos = display.viewOffset + y;
if (heightPos < 0) return {line: 0, ch: 0};
var lineNo = lineAtHeight(doc, heightPos);
if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc, doc.size - 1).text.length};
var lineObj = getLine(doc, lineNo);
if (!lineObj.text.length) return {line: lineNo, ch: 0};
var tw = cm.options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
if (x < 0) x = 0;
var wrongLine = false;
function getX(ch) {
var sp = cursorCoords(cm, {line: lineNo, ch: ch}, "line", lineObj);
if (tw) {
wrongLine = true;
if (innerOff > sp.bottom) return Math.max(0, sp.left - display.wrapper.clientWidth);
else if (innerOff < sp.top) return sp.left + display.wrapper.clientWidth;
else wrongLine = false;
}
return sp.left;
}
var bidi = getOrder(lineObj), dist = lineObj.text.length;
var from = lineLeft(lineObj), fromX = 0, to = lineRight(lineObj), toX;
if (!bidi) {
// Guess a suitable upper bound for our search.
var estimated = Math.min(to, Math.ceil((x + Math.floor(innerOff / textHeight(display)) *
display.wrapper.clientWidth * .9) / cw));
for (;;) {
var estX = getX(estimated);
if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
else {toX = estX; to = estimated; break;}
}
// Try to guess a suitable lower bound as well.
estimated = Math.floor(to * 0.8); estX = getX(estimated);
if (estX < x) {from = estimated; fromX = estX;}
dist = to - from;
} else toX = getX(to);
if (x > toX) return {line: lineNo, ch: to};
// Do a binary search between these bounds.
for (;;) {
if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
var after = x - fromX < toX - x, ch = after ? from : to;
while (isExtendingChar.test(lineObj.text.charAt(ch))) ++ch;
return {line: lineNo, ch: ch, after: after};
}
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 (wrongLine) toX += 1000; dist -= step;}
else {from = middle; fromX = middleX; dist = step;}
}
}
var measureText;
function textHeight(display) {
if (display.cachedTextHeight != null) return display.cachedTextHeight;
if (measureText == null) {
measureText = elt("pre");
// Measure a bunch of lines, for browsers that compute
// fractional heights.
for (var i = 0; i < 49; ++i) {
measureText.appendChild(document.createTextNode("x"));
measureText.appendChild(elt("br"));
}
measureText.appendChild(document.createTextNode("x"));
}
removeChildrenAndAdd(display.measure, measureText);
var height = measureText.offsetHeight / 50;
if (height > 3) display.cachedTextHeight = height;
removeChildren(display.measure);
return height || 1;
}
function charWidth(display) {
if (display.cachedCharWidth != null) return display.cachedCharWidth;
var anchor = elt("span", "x");
var pre = elt("pre", [anchor]);
removeChildrenAndAdd(display.measure, pre);
var width = anchor.offsetWidth;
if (width > 2) display.cachedCharWidth = width;
return width || 10;
}
// OPERATIONS
// Operations are used to wrap changes in such a way that each
// change won't have to update the cursor and display (which would
// be awkward, slow, and error-prone), but instead updates are
// batched and then all combined and executed at once.
function startOperation(cm) {
if (cm.curOp) ++cm.curOp.depth;
else cm.curOp = {
// Nested operations delay update until the outermost one
// finishes.
depth: 1,
// An array of ranges of lines that have to be updated. See
// updateDisplay.
changes: [],
delayedCallbacks: [],
updateInput: null,
userSelChange: null,
textChanged: null,
selectionChanged: false,
updateMaxLine: false
};
}
function endOperation(cm) {
var op = cm.curOp;
if (--op.depth) return;
cm.curOp = null;
var view = cm.view, display = cm.display;
if (op.updateMaxLine) computeMaxLength(view);
if (view.maxLineChanged && !cm.options.lineWrapping) {
var width = measureLine(cm, view.maxLine, view.maxLine.text.length).left;
display.sizer.style.minWidth = (width + 3 + scrollerCutOff) + "px";
view.maxLineChanged = false;
}
var newScrollPos, updated;
if (op.selectionChanged) {
var coords = cursorCoords(cm, selHead(view));
newScrollPos = calculateScrollPos(display, coords.left, coords.top, coords.left, coords.bottom);
}
if (op.changes.length || newScrollPos && newScrollPos.scrollTop != null)
updated = updateDisplay(cm, op.changes, newScrollPos && newScrollPos.scrollTop);
if (!updated && op.selectionChanged) updateSelection(cm);
if (newScrollPos) scrollCursorIntoView(cm);
if (op.selectionChanged) restartBlink(cm);
if (view.focused && op.updateInput)
resetInput(cm, op.userSelChange);
if (op.textChanged)
signal(cm, "change", cm, op.textChanged);
if (op.selectionChanged) signal(cm, "cursorActivity", cm);
for (var i = 0; i < op.delayedCallbacks.length; ++i) op.delayedCallbacks[i](cm);
}
// Wraps a function in an operation. Returns the wrapped function.
function operation(cm1, f) {
return function() {
var cm = cm1 || this;
startOperation(cm);