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codemirror.js
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// All functions that need access to the editor's state live inside
// the CodeMirror function. Below that, at the bottom of the file,
// some utilities are defined.
// CodeMirror is the only global var we claim
var CodeMirror = (function() {
// This is the function that produces an editor instance. It's
// closure is used to store the editor state.
function CodeMirror(place, givenOptions) {
// Determine effective options based on given values and defaults.
var options = {}, defaults = CodeMirror.defaults;
for (var opt in defaults)
if (defaults.hasOwnProperty(opt))
options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];
var targetDocument = options["document"];
// The element in which the editor lives.
var wrapper = targetDocument.createElement("div");
wrapper.className = "CodeMirror";
// This mess creates the base DOM structure for the editor.
wrapper.innerHTML =
'<div style="overflow: hidden; position: relative; width: 1px; height: 0px;">' + // Wraps and hides input textarea
'<textarea style="position: absolute; width: 2px;" wrap="off"></textarea></div>' +
'<div class="CodeMirror-scroll cm-s-' + options.theme + '">' +
'<div style="position: relative">' + // Set to the height of the text, causes scrolling
'<div style="position: absolute; height: 0; width: 0; overflow: hidden;"></div>' +
'<div style="position: relative">' + // Moved around its parent to cover visible view
'<div class="CodeMirror-gutter"><div class="CodeMirror-gutter-text"></div></div>' +
// Provides positioning relative to (visible) text origin
'<div class="CodeMirror-lines"><div style="position: relative">' +
'<pre class="CodeMirror-cursor"> </pre>' + // Absolutely positioned blinky cursor
'<div></div>' + // This DIV contains the actual code
'</div></div></div></div></div>';
if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
// I've never seen more elegant code in my life.
var inputDiv = wrapper.firstChild, input = inputDiv.firstChild,
scroller = wrapper.lastChild, code = scroller.firstChild,
measure = code.firstChild, mover = measure.nextSibling,
gutter = mover.firstChild, gutterText = gutter.firstChild,
lineSpace = gutter.nextSibling.firstChild,
cursor = lineSpace.firstChild, lineDiv = cursor.nextSibling;
if (options.tabindex != null) input.tabindex = options.tabindex;
if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
// Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
var poll = new Delayed(), highlight = new Delayed(), blinker;
// mode holds a mode API object. lines an array of Line objects
// (see Line constructor), work an array of lines that should be
// parsed, and history the undo history (instance of History
// constructor).
var mode, lines = [new Line("")], work, history = new History(), focused;
loadMode();
// The selection. These are always maintained to point at valid
// positions. Inverted is used to remember that the user is
// selecting bottom-to-top.
var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
// Selection-related flags. shiftSelecting obviously tracks
// whether the user is holding shift. reducedSelection is a hack
// to get around the fact that we can't create inverted
// selections. See below.
var shiftSelecting, reducedSelection, lastDoubleClick;
// Variables used by startOperation/endOperation to track what
// happened during the operation.
var updateInput, changes, textChanged, selectionChanged, leaveInputAlone;
// Current visible range (may be bigger than the view window).
var showingFrom = 0, showingTo = 0, lastHeight = 0, curKeyId = null;
// editing will hold an object describing the things we put in the
// textarea, to help figure out whether something changed.
// bracketHighlighted is used to remember that a backet has been
// marked.
var editing, bracketHighlighted;
// Tracks the maximum line length so that the horizontal scrollbar
// can be kept static when scrolling.
var maxLine = "";
// Initialize the content. Somewhat hacky (delayed prepareInput)
// to work around browser issues.
operation(function(){setValue(options.value || ""); updateInput = false;})();
setTimeout(prepareInput, 20);
// Register our event handlers.
connect(scroller, "mousedown", operation(onMouseDown));
// Gecko browsers fire contextmenu *after* opening the menu, at
// which point we can't mess with it anymore. Context menu is
// handled in onMouseDown for Gecko.
if (!gecko) connect(scroller, "contextmenu", operation(onContextMenu));
connect(code, "dblclick", operation(onDblClick));
connect(scroller, "scroll", function() {updateDisplay([]); if (options.onScroll) options.onScroll(instance);});
connect(window, "resize", function() {updateDisplay(true);});
connect(input, "keyup", operation(onKeyUp));
connect(input, "keydown", operation(onKeyDown));
connect(input, "keypress", operation(onKeyPress));
connect(input, "focus", onFocus);
connect(input, "blur", onBlur);
connect(scroller, "dragenter", function(e){e.stop();});
connect(scroller, "dragover", function(e){e.stop();});
connect(scroller, "drop", operation(onDrop));
connect(scroller, "paste", function(){focusInput(); fastPoll();});
connect(input, "paste", function(){fastPoll();});
connect(input, "cut", function(){fastPoll();});
// IE throws unspecified error in certain cases, when
// trying to access activeElement before onload
var hasFocus; try { hasFocus = (targetDocument.activeElement == input); } catch(e) { }
if (hasFocus) onFocus();
else onBlur();
function isLine(l) {return l >= 0 && l < lines.length;}
// The instance object that we'll return. Mostly calls out to
// local functions in the CodeMirror function. Some do some extra
// range checking and/or clipping. operation is used to wrap the
// call so that changes it makes are tracked, and the display is
// updated afterwards.
var instance = {
getValue: getValue,
setValue: operation(setValue),
getSelection: getSelection,
replaceSelection: operation(replaceSelection),
focus: function(){focusInput(); onFocus(); prepareInput(); fastPoll();},
setOption: function(option, value) {
options[option] = value;
if (option == "lineNumbers" || option == "gutter") gutterChanged();
else if (option == "mode" || option == "indentUnit") loadMode();
else if (option == "readOnly" && value == "nocursor") input.blur();
else if (option == "theme") scroller.className = scroller.className.replace(/cm-s-\w+/, "cm-s-" + value);
},
getOption: function(option) {return options[option];},
undo: operation(undo),
redo: operation(redo),
indentLine: operation(function(n) {if (isLine(n)) indentLine(n, "smart");}),
historySize: function() {return {undo: history.done.length, redo: history.undone.length};},
matchBrackets: operation(function(){matchBrackets(true);}),
getTokenAt: function(pos) {
pos = clipPos(pos);
return lines[pos.line].getTokenAt(mode, getStateBefore(pos.line), pos.ch);
},
cursorCoords: function(start){
if (start == null) start = sel.inverted;
return pageCoords(start ? sel.from : sel.to);
},
charCoords: function(pos){return pageCoords(clipPos(pos));},
coordsChar: function(coords) {
var off = eltOffset(lineSpace);
var line = clipLine(Math.min(lines.length - 1, showingFrom + Math.floor((coords.y - off.top) / lineHeight())));
return clipPos({line: line, ch: charFromX(clipLine(line), coords.x - off.left)});
},
getSearchCursor: function(query, pos, caseFold) {return new SearchCursor(query, pos, caseFold);},
markText: operation(function(a, b, c){return operation(markText(a, b, c));}),
setMarker: addGutterMarker,
clearMarker: removeGutterMarker,
setLineClass: operation(setLineClass),
lineInfo: lineInfo,
addWidget: function(pos, node, scroll) {
var pos = localCoords(clipPos(pos), true);
node.style.top = (showingFrom * lineHeight() + pos.yBot + paddingTop()) + "px";
node.style.left = (pos.x + paddingLeft()) + "px";
code.appendChild(node);
if (scroll)
scrollIntoView(pos.x, pos.yBot, pos.x + node.offsetWidth, pos.yBot + node.offsetHeight);
},
lineCount: function() {return lines.length;},
getCursor: function(start) {
if (start == null) start = sel.inverted;
return copyPos(start ? sel.from : sel.to);
},
somethingSelected: function() {return !posEq(sel.from, sel.to);},
setCursor: operation(function(line, ch) {
if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch);
else setCursor(line, ch);
}),
setSelection: operation(function(from, to) {setSelection(clipPos(from), clipPos(to || from));}),
getLine: function(line) {if (isLine(line)) return lines[line].text;},
setLine: operation(function(line, text) {
if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: lines[line].text.length});
}),
removeLine: operation(function(line) {
if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line+1, ch: 0}));
}),
replaceRange: operation(replaceRange),
getRange: function(from, to) {return getRange(clipPos(from), clipPos(to));},
operation: function(f){return operation(f)();},
refresh: function(){updateDisplay(true);},
getInputField: function(){return input;},
getWrapperElement: function(){return wrapper;}
};
function setValue(code) {
history = null;
var top = {line: 0, ch: 0};
updateLines(top, {line: lines.length - 1, ch: lines[lines.length-1].text.length},
splitLines(code), top, top);
history = new History();
}
function getValue(code) {
var text = [];
for (var i = 0, l = lines.length; i < l; ++i)
text.push(lines[i].text);
return text.join("\n");
}
function onMouseDown(e) {
var ld = lastDoubleClick; lastDoubleClick = null;
// First, see if this is a click in the gutter
for (var n = e.target(); n != wrapper; n = n.parentNode)
if (n.parentNode == gutterText) {
if (options.onGutterClick)
options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom);
return e.stop();
}
if (gecko && e.button() == 3) onContextMenu(e);
if (e.button() != 1) return;
// For button 1, if it was clicked inside the editor
// (posFromMouse returning non-null), we have to adjust the
// selection.
var start = posFromMouse(e), last = start, going;
if (!start) {if (e.target() == scroller) e.stop(); return;}
if (!focused) onFocus();
e.stop();
if (ld && +new Date - ld < 400) return selectLine(start.line);
setCursor(start.line, start.ch, true);
// And then we have to see if it's a drag event, in which case
// the dragged-over text must be selected.
function end() {
focusInput();
updateInput = true;
move(); up();
}
function extend(e) {
var cur = posFromMouse(e, true);
if (cur && !posEq(cur, last)) {
if (!focused) onFocus();
last = cur;
setSelectionUser(start, cur);
updateInput = false;
var visible = visibleLines();
if (cur.line >= visible.to || cur.line < visible.from)
going = setTimeout(operation(function(){extend(e);}), 150);
}
}
var move = connect(targetDocument, "mousemove", operation(function(e) {
clearTimeout(going);
e.stop();
extend(e);
}), true);
var up = connect(targetDocument, "mouseup", operation(function(e) {
clearTimeout(going);
var cur = posFromMouse(e);
if (cur) setSelectionUser(start, cur);
e.stop();
end();
}), true);
}
function onDblClick(e) {
var pos = posFromMouse(e);
if (!pos) return;
selectWordAt(pos);
e.stop();
lastDoubleClick = +new Date;
}
function onDrop(e) {
var pos = posFromMouse(e, true), files = e.e.dataTransfer.files;
if (!pos || options.readOnly) return;
if (files && files.length && window.FileReader && window.File) {
var n = files.length, text = Array(n), read = 0;
for (var i = 0; i < n; ++i) loadFile(files[i], i);
function loadFile(file, i) {
var reader = new FileReader;
reader.onload = function() {
text[i] = reader.result;
if (++read == n) replaceRange(text.join(""), clipPos(pos), clipPos(pos));
};
reader.readAsText(file);
}
}
else {
try {
var text = e.e.dataTransfer.getData("Text");
if (text) replaceRange(text, pos, pos);
}
catch(e){}
}
}
function onKeyDown(e) {
if (!focused) onFocus();
var code = e.e.keyCode;
// IE does strange things with escape.
if (ie && code == 27) { e.e.returnValue = false; }
// Tries to detect ctrl on non-mac, cmd on mac.
var mod = (mac ? e.e.metaKey : e.e.ctrlKey) && !e.e.altKey, anyMod = e.e.ctrlKey || e.e.altKey || e.e.metaKey;
if (code == 16 || e.e.shiftKey) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
else shiftSelecting = null;
// First give onKeyEvent option a chance to handle this.
if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e.e))) return;
if (code == 33 || code == 34) {scrollPage(code == 34); return e.stop();} // page up/down
if (mod && ((code == 36 || code == 35) || // ctrl-home/end
mac && (code == 38 || code == 40))) { // cmd-up/down
scrollEnd(code == 36 || code == 38); return e.stop();
}
if (mod && code == 65) {selectAll(); return e.stop();} // ctrl-a
if (!options.readOnly) {
if (!anyMod && code == 13) {return;} // enter
if (!anyMod && code == 9 && handleTab(e.e.shiftKey)) return e.stop(); // tab
if (mod && code == 90) {undo(); return e.stop();} // ctrl-z
if (mod && ((e.e.shiftKey && code == 90) || code == 89)) {redo(); return e.stop();} // ctrl-shift-z, ctrl-y
}
// Key id to use in the movementKeys map. We also pass it to
// fastPoll in order to 'self learn'. We need this because
// reducedSelection, the hack where we collapse the selection to
// its start when it is inverted and a movement key is pressed
// (and later restore it again), shouldn't be used for
// non-movement keys.
curKeyId = (mod ? "c" : "") + code;
if (sel.inverted && movementKeys.hasOwnProperty(curKeyId)) {
var range = selRange(input);
if (range) {
reducedSelection = {anchor: range.start};
setSelRange(input, range.start, range.start);
}
}
fastPoll(curKeyId);
}
function onKeyUp(e) {
if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e.e))) return;
if (reducedSelection) {
reducedSelection = null;
updateInput = true;
}
if (e.e.keyCode == 16) shiftSelecting = null;
}
function onKeyPress(e) {
if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e.e))) return;
if (options.electricChars && mode.electricChars) {
var ch = String.fromCharCode(e.e.charCode == null ? e.e.keyCode : e.e.charCode);
if (mode.electricChars.indexOf(ch) > -1)
setTimeout(operation(function() {indentLine(sel.to.line, "smart");}), 50);
}
var code = e.e.keyCode;
// Re-stop tab and enter. Necessary on some browsers.
if (code == 13) {if (!options.readOnly) handleEnter(); e.stop();}
else if (!e.e.ctrlKey && !e.e.altKey && !e.e.metaKey && code == 9 && options.tabMode != "default") e.stop();
else fastPoll(curKeyId);
}
function onFocus() {
if (options.readOnly == "nocursor") return;
if (!focused && options.onFocus) options.onFocus(instance);
focused = true;
slowPoll();
if (wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
wrapper.className += " CodeMirror-focused";
restartBlink();
}
function onBlur() {
if (focused && options.onBlur) options.onBlur(instance);
clearInterval(blinker);
shiftSelecting = null;
focused = false;
wrapper.className = wrapper.className.replace(" CodeMirror-focused", "");
}
// Replace the range from from to to by the strings in newText.
// Afterwards, set the selection to selFrom, selTo.
function updateLines(from, to, newText, selFrom, selTo) {
if (history) {
var old = [];
for (var i = from.line, e = to.line + 1; i < e; ++i) old.push(lines[i].text);
history.addChange(from.line, newText.length, old);
while (history.done.length > options.undoDepth) history.done.shift();
}
updateLinesNoUndo(from, to, newText, selFrom, selTo);
if (newText.length < 5)
highlightLines(from.line, from.line + newText.length)
}
function unredoHelper(from, to) {
var change = from.pop();
if (change) {
var replaced = [], end = change.start + change.added;
for (var i = change.start; i < end; ++i) replaced.push(lines[i].text);
to.push({start: change.start, added: change.old.length, old: replaced});
var pos = clipPos({line: change.start + change.old.length - 1,
ch: editEnd(replaced[replaced.length-1], change.old[change.old.length-1])});
updateLinesNoUndo({line: change.start, ch: 0}, {line: end - 1, ch: lines[end-1].text.length}, change.old, pos, pos);
}
}
function undo() {unredoHelper(history.done, history.undone);}
function redo() {unredoHelper(history.undone, history.done);}
function updateLinesNoUndo(from, to, newText, selFrom, selTo) {
var recomputeMaxLength = false, maxLineLength = maxLine.length;
for (var i = from.line; i <= to.line; ++i) {
if (lines[i].text.length == maxLineLength) {recomputeMaxLength = true; break;}
}
var nlines = to.line - from.line, firstLine = lines[from.line], lastLine = lines[to.line];
// First adjust the line structure, taking some care to leave highlighting intact.
if (firstLine == lastLine) {
if (newText.length == 1)
firstLine.replace(from.ch, to.ch, newText[0]);
else {
lastLine = firstLine.split(to.ch, newText[newText.length-1]);
var spliceargs = [from.line + 1, nlines];
firstLine.replace(from.ch, firstLine.text.length, newText[0]);
for (var i = 1, e = newText.length - 1; i < e; ++i) spliceargs.push(new Line(newText[i]));
spliceargs.push(lastLine);
lines.splice.apply(lines, spliceargs);
}
}
else if (newText.length == 1) {
firstLine.replace(from.ch, firstLine.text.length, newText[0] + lastLine.text.slice(to.ch));
lines.splice(from.line + 1, nlines);
}
else {
var spliceargs = [from.line + 1, nlines - 1];
firstLine.replace(from.ch, firstLine.text.length, newText[0]);
lastLine.replace(0, to.ch, newText[newText.length-1]);
for (var i = 1, e = newText.length - 1; i < e; ++i) spliceargs.push(new Line(newText[i]));
lines.splice.apply(lines, spliceargs);
}
for (var i = from.line, e = i + newText.length; i < e; ++i) {
var l = lines[i].text;
if (l.length > maxLineLength) {
maxLine = l; maxLineLength = l.length;
recomputeMaxLength = false;
}
}
if (recomputeMaxLength) {
maxLineLength = 0; maxLine = "";
for (var i = 0, e = lines.length; i < e; ++i) {
var l = lines[i].text;
if (l.length > maxLineLength) {
maxLineLength = l.length; maxLine = l;
}
}
}
// Add these lines to the work array, so that they will be
// highlighted. Adjust work lines if lines were added/removed.
var newWork = [], lendiff = newText.length - nlines - 1;
for (var i = 0, l = work.length; i < l; ++i) {
var task = work[i];
if (task < from.line) newWork.push(task);
else if (task > to.line) newWork.push(task + lendiff);
}
if (newText.length) newWork.push(from.line);
work = newWork;
startWorker(100);
// Remember that these lines changed, for updating the display
changes.push({from: from.line, to: to.line + 1, diff: lendiff});
textChanged = {from: from, to: to, text: newText};
// Update the selection
function updateLine(n) {return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;}
setSelection(selFrom, selTo, updateLine(sel.from.line), updateLine(sel.to.line));
// Make sure the scroll-size div has the correct height.
code.style.height = (lines.length * lineHeight() + 2 * paddingTop()) + "px";
}
function replaceRange(code, from, to) {
from = clipPos(from);
if (!to) to = from; else to = clipPos(to);
code = splitLines(code);
function adjustPos(pos) {
if (posLess(pos, from)) return pos;
if (!posLess(to, pos)) return end;
var line = pos.line + code.length - (to.line - from.line) - 1;
var ch = pos.ch;
if (pos.line == to.line)
ch += code[code.length-1].length - (to.ch - (to.line == from.line ? from.ch : 0));
return {line: line, ch: ch};
}
var end;
replaceRange1(code, from, to, function(end1) {
end = end1;
return {from: adjustPos(sel.from), to: adjustPos(sel.to)};
});
return end;
}
function replaceSelection(code, collapse) {
replaceRange1(splitLines(code), sel.from, sel.to, function(end) {
if (collapse == "end") return {from: end, to: end};
else if (collapse == "start") return {from: sel.from, to: sel.from};
else return {from: sel.from, to: end};
});
}
function replaceRange1(code, from, to, computeSel) {
var endch = code.length == 1 ? code[0].length + from.ch : code[code.length-1].length;
var newSel = computeSel({line: from.line + code.length - 1, ch: endch});
updateLines(from, to, code, newSel.from, newSel.to);
}
function getRange(from, to) {
var l1 = from.line, l2 = to.line;
if (l1 == l2) return lines[l1].text.slice(from.ch, to.ch);
var code = [lines[l1].text.slice(from.ch)];
for (var i = l1 + 1; i < l2; ++i) code.push(lines[i].text);
code.push(lines[l2].text.slice(0, to.ch));
return code.join("\n");
}
function getSelection() {
return getRange(sel.from, sel.to);
}
var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
function slowPoll() {
if (pollingFast) return;
poll.set(2000, function() {
startOperation();
readInput();
if (focused) slowPoll();
endOperation();
});
}
function fastPoll(keyId) {
var missed = false;
pollingFast = true;
function p() {
startOperation();
var changed = readInput();
if (changed == "moved" && keyId) movementKeys[keyId] = true;
if (!changed && !missed) {missed = true; poll.set(80, p);}
else {pollingFast = false; slowPoll();}
endOperation();
}
poll.set(20, p);
}
// Inspects the textarea, compares its state (content, selection)
// to the data in the editing variable, and updates the editor
// content or cursor if something changed.
function readInput() {
if (leaveInputAlone) return;
var changed = false, text = input.value, sr = selRange(input);
if (!sr) return false;
var changed = editing.text != text, rs = reducedSelection;
var moved = changed || sr.start != editing.start || sr.end != (rs ? editing.start : editing.end);
if (!moved && !rs) return false;
if (changed) {
shiftSelecting = reducedSelection = null;
if (options.readOnly) {updateInput = true; return "changed";}
}
// Compute selection start and end based on start/end offsets in textarea
function computeOffset(n, startLine) {
var pos = 0;
for (;;) {
var found = text.indexOf("\n", pos);
if (found == -1 || (text.charAt(found-1) == "\r" ? found - 1 : found) >= n)
return {line: startLine, ch: n - pos};
++startLine;
pos = found + 1;
}
}
var from = computeOffset(sr.start, editing.from),
to = computeOffset(sr.end, editing.from);
// Here we have to take the reducedSelection hack into account,
// so that you can, for example, press shift-up at the start of
// your selection and have the right thing happen.
if (rs) {
var head = sr.start == rs.anchor ? to : from;
var tail = shiftSelecting ? sel.to : sr.start == rs.anchor ? from : to;
if (sel.inverted = posLess(head, tail)) { from = head; to = tail; }
else { reducedSelection = null; from = tail; to = head; }
}
// In some cases (cursor on same line as before), we don't have
// to update the textarea content at all.
if (from.line == to.line && from.line == sel.from.line && from.line == sel.to.line && !shiftSelecting)
updateInput = false;
// Magic mess to extract precise edited range from the changed
// string.
if (changed) {
var start = 0, end = text.length, len = Math.min(end, editing.text.length);
var c, line = editing.from, nl = -1;
while (start < len && (c = text.charAt(start)) == editing.text.charAt(start)) {
++start;
if (c == "\n") {line++; nl = start;}
}
var ch = nl > -1 ? start - nl : start, endline = editing.to - 1, edend = editing.text.length;
for (;;) {
c = editing.text.charAt(edend);
if (text.charAt(end) != c) {++end; ++edend; break;}
if (c == "\n") endline--;
if (edend <= start || end <= start) break;
--end; --edend;
}
var nl = editing.text.lastIndexOf("\n", edend - 1), endch = nl == -1 ? edend : edend - nl - 1;
updateLines({line: line, ch: ch}, {line: endline, ch: endch}, splitLines(text.slice(start, end)), from, to);
if (line != endline || from.line != line) updateInput = true;
}
else setSelection(from, to);
editing.text = text; editing.start = sr.start; editing.end = sr.end;
return changed ? "changed" : moved ? "moved" : false;
}
// Set the textarea content and selection range to match the
// editor state.
function prepareInput() {
var text = [];
var from = Math.max(0, sel.from.line - 1), to = Math.min(lines.length, sel.to.line + 2);
for (var i = from; i < to; ++i) text.push(lines[i].text);
text = input.value = text.join(lineSep);
var startch = sel.from.ch, endch = sel.to.ch;
for (var i = from; i < sel.from.line; ++i)
startch += lineSep.length + lines[i].text.length;
for (var i = from; i < sel.to.line; ++i)
endch += lineSep.length + lines[i].text.length;
editing = {text: text, from: from, to: to, start: startch, end: endch};
setSelRange(input, startch, reducedSelection ? startch : endch);
}
function focusInput() {
if (options.readOnly != "nocursor") input.focus();
}
function scrollCursorIntoView() {
var cursor = localCoords(sel.inverted ? sel.from : sel.to);
return scrollIntoView(cursor.x, cursor.y, cursor.x, cursor.yBot);
}
function scrollIntoView(x1, y1, x2, y2) {
var pl = paddingLeft(), pt = paddingTop(), lh = lineHeight();
y1 += pt; y2 += pt; x1 += pl; x2 += pl;
var screen = scroller.clientHeight, screentop = scroller.scrollTop, scrolled = false, result = true;
if (y1 < screentop) {scroller.scrollTop = Math.max(0, y1 - 2*lh); scrolled = true;}
else if (y2 > screentop + screen) {scroller.scrollTop = y2 + lh - screen; scrolled = true;}
var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
if (x1 < screenleft) {
if (x1 < 50) x1 = 0;
scroller.scrollLeft = Math.max(0, x1 - 10);
scrolled = true;
}
else if (x2 > screenw + screenleft) {
scroller.scrollLeft = x2 + 10 - screenw;
scrolled = true;
if (x2 > code.clientWidth) result = false;
}
if (scrolled && options.onScroll) options.onScroll(instance);
return result;
}
function visibleLines() {
var lh = lineHeight(), top = scroller.scrollTop - paddingTop();
return {from: Math.min(lines.length, Math.max(0, Math.floor(top / lh))),
to: Math.min(lines.length, Math.ceil((top + scroller.clientHeight) / lh))};
}
// Uses a set of changes plus the current scroll position to
// determine which DOM updates have to be made, and makes the
// updates.
function updateDisplay(changes) {
if (!scroller.clientWidth) {
showingFrom = showingTo = 0;
return;
}
// First create a range of theoretically intact lines, and punch
// holes in that using the change info.
var intact = changes === true ? [] : [{from: showingFrom, to: showingTo, domStart: 0}];
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)
intact2.push({from: range.from + diff, to: range.to + diff, domStart: range.domStart});
else if (range.to <= change.from)
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;
}
// Then, determine which lines we'd want to see, and which
// updates have to be made to get there.
var visible = visibleLines();
var from = Math.min(showingFrom, Math.max(visible.from - 3, 0)),
to = Math.min(lines.length, Math.max(showingTo, visible.to + 3)),
updates = [], domPos = 0, domEnd = showingTo - showingFrom, pos = from, changedLines = 0;
for (var i = 0, l = intact.length; i < l; ++i) {
var range = intact[i];
if (range.to <= from) continue;
if (range.from >= to) break;
if (range.domStart > domPos || range.from > pos) {
updates.push({from: pos, to: range.from, domSize: range.domStart - domPos, domStart: domPos});
changedLines += range.from - pos;
}
pos = range.to;
domPos = range.domStart + (range.to - range.from);
}
if (domPos != domEnd || pos != to) {
changedLines += Math.abs(to - pos);
updates.push({from: pos, to: to, domSize: domEnd - domPos, domStart: domPos});
}
if (!updates.length) return;
lineDiv.style.display = "none";
// If more than 30% of the screen needs update, just do a full
// redraw (which is quicker than patching)
if (changedLines > (visible.to - visible.from) * .3)
refreshDisplay(from = Math.max(visible.from - 10, 0), to = Math.min(visible.to + 7, lines.length));
// Otherwise, only update the stuff that needs updating.
else
patchDisplay(updates);
lineDiv.style.display = "";
// Position the mover div to align with the lines it's supposed
// to be showing (which will cover the visible display)
var different = from != showingFrom || to != showingTo || lastHeight != scroller.clientHeight;
showingFrom = from; showingTo = to;
mover.style.top = (from * lineHeight()) + "px";
if (different) {
lastHeight = scroller.clientHeight;
code.style.height = (lines.length * lineHeight() + 2 * paddingTop()) + "px";
updateGutter();
}
var textWidth = stringWidth(maxLine);
lineSpace.style.width = textWidth > scroller.clientWidth ? textWidth + "px" : "";
// Since this is all rather error prone, it is honoured with the
// only assertion in the whole file.
if (lineDiv.childNodes.length != showingTo - showingFrom)
throw new Error("BAD PATCH! " + JSON.stringify(updates) + " size=" + (showingTo - showingFrom) +
" nodes=" + lineDiv.childNodes.length);
updateCursor();
}
function refreshDisplay(from, to) {
var html = [], start = {line: from, ch: 0}, inSel = posLess(sel.from, start) && !posLess(sel.to, start);
for (var i = from; i < to; ++i) {
var ch1 = null, ch2 = null;
if (inSel) {
ch1 = 0;
if (sel.to.line == i) {inSel = false; ch2 = sel.to.ch;}
}
else if (sel.from.line == i) {
if (sel.to.line == i) {ch1 = sel.from.ch; ch2 = sel.to.ch;}
else {inSel = true; ch1 = sel.from.ch;}
}
html.push(lines[i].getHTML(ch1, ch2, true));
}
lineDiv.innerHTML = html.join("");
}
function patchDisplay(updates) {
// Slightly different algorithm for IE (badInnerHTML), since
// there .innerHTML on PRE nodes is dumb, and discards
// whitespace.
var sfrom = sel.from.line, sto = sel.to.line, off = 0,
scratch = badInnerHTML && targetDocument.createElement("div");
for (var i = 0, e = updates.length; i < e; ++i) {
var rec = updates[i];
var extra = (rec.to - rec.from) - rec.domSize;
var nodeAfter = lineDiv.childNodes[rec.domStart + rec.domSize + off] || null;
if (badInnerHTML)
for (var j = Math.max(-extra, rec.domSize); j > 0; --j)
lineDiv.removeChild(nodeAfter ? nodeAfter.previousSibling : lineDiv.lastChild);
else if (extra) {
for (var j = Math.max(0, extra); j > 0; --j)
lineDiv.insertBefore(targetDocument.createElement("pre"), nodeAfter);
for (var j = Math.max(0, -extra); j > 0; --j)
lineDiv.removeChild(nodeAfter ? nodeAfter.previousSibling : lineDiv.lastChild);
}
var node = lineDiv.childNodes[rec.domStart + off], inSel = sfrom < rec.from && sto >= rec.from;
for (var j = rec.from; j < rec.to; ++j) {
var ch1 = null, ch2 = null;
if (inSel) {
ch1 = 0;
if (sto == j) {inSel = false; ch2 = sel.to.ch;}
}
else if (sfrom == j) {
if (sto == j) {ch1 = sel.from.ch; ch2 = sel.to.ch;}
else {inSel = true; ch1 = sel.from.ch;}
}
if (badInnerHTML) {
scratch.innerHTML = lines[j].getHTML(ch1, ch2, true);
lineDiv.insertBefore(scratch.firstChild, nodeAfter);
}
else {
node.innerHTML = lines[j].getHTML(ch1, ch2, false);
node.className = lines[j].className || "";
node = node.nextSibling;
}
}
off += extra;
}
}
function updateGutter() {
if (!options.gutter && !options.lineNumbers) return;
var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
var html = [];
for (var i = showingFrom; i < Math.max(showingTo, showingFrom + 1); ++i) {
var marker = lines[i].gutterMarker;
var text = options.lineNumbers ? i + options.firstLineNumber : null;
if (marker && marker.text)
text = marker.text.replace("%N%", text != null ? text : "");
else if (text == null)
text = "\u00a0";
html.push((marker && marker.style ? '<pre class="' + marker.style + '">' : "<pre>"), text, "</pre>");
}
gutter.style.display = "none";
gutterText.innerHTML = html.join("");
var minwidth = String(lines.length).length, firstNode = gutterText.firstChild, val = eltText(firstNode), pad = "";
while (val.length + pad.length < minwidth) pad += "\u00a0";
if (pad) firstNode.insertBefore(targetDocument.createTextNode(pad), firstNode.firstChild);
gutter.style.display = "";
lineSpace.style.marginLeft = gutter.offsetWidth + "px";
}
function updateCursor() {
var head = sel.inverted ? sel.from : sel.to, lh = lineHeight();
var x = charX(head.line, head.ch) + "px", y = (head.line - showingFrom) * lh + "px";
inputDiv.style.top = (head.line * lh - scroller.scrollTop) + "px";
if (posEq(sel.from, sel.to)) {
cursor.style.top = y; cursor.style.left = x;
cursor.style.display = "";
}
else cursor.style.display = "none";
}
function setSelectionUser(from, to) {
var sh = shiftSelecting && clipPos(shiftSelecting);
if (sh) {
if (posLess(sh, from)) from = sh;
else if (posLess(to, sh)) to = sh;
}
setSelection(from, to);
}
// Update the selection. Last two args are only used by
// updateLines, since they have to be expressed in the line
// numbers before the update.
function setSelection(from, to, oldFrom, oldTo) {
if (posEq(sel.from, from) && posEq(sel.to, to)) return;
if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
if (posEq(from, to)) sel.inverted = false;
else if (posEq(from, sel.to)) sel.inverted = false;
else if (posEq(to, sel.from)) sel.inverted = true;
// Some ugly logic used to only mark the lines that actually did
// see a change in selection as changed, rather than the whole
// selected range.
if (oldFrom == null) {oldFrom = sel.from.line; oldTo = sel.to.line;}
if (posEq(from, to)) {
if (!posEq(sel.from, sel.to))
changes.push({from: oldFrom, to: oldTo + 1});
}
else if (posEq(sel.from, sel.to)) {
changes.push({from: from.line, to: to.line + 1});
}
else {
if (!posEq(from, sel.from)) {
if (from.line < oldFrom)
changes.push({from: from.line, to: Math.min(to.line, oldFrom) + 1});
else
changes.push({from: oldFrom, to: Math.min(oldTo, from.line) + 1});
}
if (!posEq(to, sel.to)) {
if (to.line < oldTo)
changes.push({from: Math.max(oldFrom, from.line), to: oldTo + 1});
else
changes.push({from: Math.max(from.line, oldTo), to: to.line + 1});
}
}
sel.from = from; sel.to = to;
selectionChanged = true;
}
function setCursor(line, ch, user) {
var pos = clipPos({line: line, ch: ch || 0});
(user ? setSelectionUser : setSelection)(pos, pos);
}
function clipLine(n) {return Math.max(0, Math.min(n, lines.length-1));}
function clipPos(pos) {
if (pos.line < 0) return {line: 0, ch: 0};
if (pos.line >= lines.length) return {line: lines.length-1, ch: lines[lines.length-1].text.length};
var ch = pos.ch, linelen = lines[pos.line].text.length;
if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
else if (ch < 0) return {line: pos.line, ch: 0};
else return pos;
}
function scrollPage(down) {
var linesPerPage = Math.floor(scroller.clientHeight / lineHeight()), head = sel.inverted ? sel.from : sel.to;
setCursor(head.line + (Math.max(linesPerPage - 1, 1) * (down ? 1 : -1)), head.ch, true);
}
function scrollEnd(top) {
var pos = top ? {line: 0, ch: 0} : {line: lines.length - 1, ch: lines[lines.length-1].text.length};
setSelectionUser(pos, pos);
}
function selectAll() {
var endLine = lines.length - 1;
setSelection({line: 0, ch: 0}, {line: endLine, ch: lines[endLine].text.length});
}
function selectWordAt(pos) {
var line = lines[pos.line].text;
var start = pos.ch, end = pos.ch;
while (start > 0 && /\w/.test(line.charAt(start - 1))) --start;
while (end < line.length && /\w/.test(line.charAt(end))) ++end;
setSelectionUser({line: pos.line, ch: start}, {line: pos.line, ch: end});
}
function selectLine(line) {
setSelectionUser({line: line, ch: 0}, {line: line, ch: lines[line].text.length});
}
function handleEnter() {
replaceSelection("\n", "end");
if (options.enterMode != "flat")
indentLine(sel.from.line, options.enterMode == "keep" ? "prev" : "smart");
}
function handleTab(shift) {
shiftSelecting = null;
switch (options.tabMode) {
case "default":
return false;
case "indent":
for (var i = sel.from.line, e = sel.to.line; i <= e; ++i) indentLine(i, "smart");
break;
case "classic":
if (posEq(sel.from, sel.to)) {
if (shift) indentLine(sel.from.line, "smart");
else replaceSelection("\t", "end");
break;
}
case "shift":
for (var i = sel.from.line, e = sel.to.line; i <= e; ++i) indentLine(i, shift ? "subtract" : "add");
break;
}
return true;
}
function indentLine(n, how) {
if (how == "smart") {
if (!mode.indent) how = "prev";
else var state = getStateBefore(n);
}
var line = lines[n], curSpace = line.indentation(), curSpaceString = line.text.match(/^\s*/)[0], indentation;
if (how == "prev") {
if (n) indentation = lines[n-1].indentation();
else indentation = 0;
}
else if (how == "smart") indentation = mode.indent(state, line.text.slice(curSpaceString.length));
else if (how == "add") indentation = curSpace + options.indentUnit;
else if (how == "subtract") indentation = curSpace - options.indentUnit;
indentation = Math.max(0, indentation);
var diff = indentation - curSpace;
if (!diff) {
if (sel.from.line != n && sel.to.line != n) return;
var indentString = curSpaceString;
}
else {
var indentString = "", pos = 0;
if (options.indentWithTabs)
for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
while (pos < indentation) {++pos; indentString += " ";}
}
replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
}
function loadMode() {
mode = CodeMirror.getMode(options, options.mode);
for (var i = 0, l = lines.length; i < l; ++i)
lines[i].stateAfter = null;
work = [0];
startWorker();
}
function gutterChanged() {
var visible = options.gutter || options.lineNumbers;
gutter.style.display = visible ? "" : "none";
if (visible) updateGutter();
else lineDiv.parentNode.style.marginLeft = 0;
}
function markText(from, to, className) {
from = clipPos(from); to = clipPos(to);
var accum = [];
function add(line, from, to, className) {
var line = lines[line], mark = line.addMark(from, to, className);
mark.line = line;