/
codemirror.js
2724 lines (2590 loc) · 107 KB
/
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" + (options.lineWrapping ? " CodeMirror-wrap" : "");
// 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: 10000px;" wrap="off" ' +
'autocorrect="off" autocapitalize="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: 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" draggable="true">' +
'<div style="position: absolute; width: 100%; height: 0; overflow: hidden; visibility: hidden"></div>' +
'<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,
mover = code.firstChild, gutter = mover.firstChild, gutterText = gutter.firstChild,
lineSpace = gutter.nextSibling.firstChild, measure = lineSpace.firstChild,
cursor = measure.nextSibling, lineDiv = cursor.nextSibling;
if (options.tabindex != null) input.tabindex = options.tabindex;
if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
// Check for problem with IE innerHTML not working when we have a
// P (or similar) parent node.
try { stringWidth("x"); }
catch (e) {
if (e.message.match(/unknown runtime/i))
e = new Error("A CodeMirror inside a P-style element does not work in Internet Explorer. (innerHTML bug)");
throw e;
}
// 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. doc is the tree of Line objects,
// work an array of lines that should be parsed, and history the
// undo history (instance of History constructor).
var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), work, 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, lastClick, lastDoubleClick, draggingText;
// Variables used by startOperation/endOperation to track what
// happened during the operation.
var updateInput, changes, textChanged, selectionChanged, leaveInputAlone, gutterDirty;
// Current visible range (may be bigger than the view window).
var displayOffset = 0, 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 = "", maxWidth;
// Initialize the content.
operation(function(){setValue(options.value || ""); updateInput = false;})();
var history = new History();
var slowPollInterval = 2000;
// Gecko and Opera Linux do not reliably fire any event when starting an IME compose
var alwaysPollForIME = (!win && !mac) && (gecko || window.opera);
if (options.pollForIME && alwaysPollForIME) slowPollInterval = 50;
function keyMightStartIME(keyCode) {
return (win && ((gecko && keyCode == 229) || (window.opera && keyCode == 197))) || (mac && gecko);
}
// Register our event handlers.
connect(scroller, "mousedown", operation(onMouseDown));
connect(scroller, "dblclick", operation(onDoubleClick));
connect(lineSpace, "dragstart", onDragStart);
// 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", onContextMenu);
connect(scroller, "scroll", function() {
updateDisplay([]);
if (options.fixedGutter) gutter.style.left = scroller.scrollLeft + "px";
if (options.onScroll) options.onScroll(instance);
});
connect(window, "resize", function() {updateDisplay(true);});
connect(input, "keyup", operation(onKeyUp));
connect(input, "input", function() {fastPoll(curKeyId);});
connect(input, "keydown", operation(onKeyDown));
connect(input, "keypress", operation(onKeyPress));
connect(input, "focus", onFocus);
connect(input, "blur", onBlur);
connect(scroller, "dragenter", e_stop);
connect(scroller, "dragover", 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) setTimeout(onFocus, 20);
else onBlur();
function isLine(l) {return l >= 0 && l < doc.size;}
// 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 = wrapper.CodeMirror = {
getValue: getValue,
setValue: operation(setValue),
getSelection: getSelection,
replaceSelection: operation(replaceSelection),
focus: function(){focusInput(); onFocus(); fastPoll();},
setOption: function(option, value) {
var oldVal = options[option];
options[option] = value;
if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber")
operation(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);
else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
else if (option == "pollForIME" && alwaysPollForIME) slowPollInterval = value ? 50 : 2000;
},
getOption: function(option) {return options[option];},
undo: operation(undo),
redo: operation(redo),
indentLine: operation(function(n, dir) {
if (isLine(n)) indentLine(n, dir == null ? "smart" : dir ? "add" : "subtract");
}),
historySize: function() {return {undo: history.done.length, redo: history.undone.length};},
clearHistory: function() {history = new History();},
matchBrackets: operation(function(){matchBrackets(true);}),
getTokenAt: operation(function(pos) {
pos = clipPos(pos);
return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), pos.ch);
}),
getStateAfter: function(line) {
line = clipLine(line == null ? doc.size - 1: line);
return getStateBefore(line + 1);
},
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);
return coordsChar(coords.x - off.left, coords.y - off.top);
},
getSearchCursor: function(query, pos, caseFold) {return new SearchCursor(query, pos, caseFold);},
markText: operation(markText),
setMarker: operation(addGutterMarker),
clearMarker: operation(removeGutterMarker),
setLineClass: operation(setLineClass),
hideLine: operation(function(h) {return setLineHidden(h, true);}),
showLine: operation(function(h) {return setLineHidden(h, false);}),
lineInfo: lineInfo,
addWidget: function(pos, node, scroll, vert, horiz) {
pos = localCoords(clipPos(pos));
var top = pos.yBot, left = pos.x;
node.style.position = "absolute";
code.appendChild(node);
if (vert == "over") top = pos.y;
else if (vert == "near") {
var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),
hspace = Math.max(code.clientWidth, lineSpace.clientWidth) - paddingLeft();
if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight)
top = pos.y - node.offsetHeight;
if (left + node.offsetWidth > hspace)
left = hspace - node.offsetWidth;
}
node.style.top = (top + paddingTop()) + "px";
node.style.left = node.style.right = "";
if (horiz == "right") {
left = code.clientWidth - node.offsetWidth;
node.style.right = "0px";
} else {
if (horiz == "left") left = 0;
else if (horiz == "middle") left = (code.clientWidth - node.offsetWidth) / 2;
node.style.left = (left + paddingLeft()) + "px";
}
if (scroll)
scrollIntoView(left, top, left + node.offsetWidth, top + node.offsetHeight);
},
lineCount: function() {return doc.size;},
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 getLine(line).text;},
setLine: operation(function(line, text) {
if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(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));},
coordsFromIndex: function(off) {
var lineNo = 0, ch;
doc.iter(0, doc.size, function(line) {
var sz = line.text.length + 1;
if (sz > off) { ch = off; return true; }
off -= sz;
++lineNo;
});
return clipPos({line: lineNo, ch: ch});
},
operation: function(f){return operation(f)();},
refresh: function(){updateDisplay(true);},
getInputField: function(){return input;},
getWrapperElement: function(){return wrapper;},
getScrollerElement: function(){return scroller;},
getGutterElement: function(){return gutter;}
};
function getLine(n) { return getLineAt(doc, n); }
function updateLineHeight(line, height) {
gutterDirty = true;
var diff = height - line.height;
for (var n = line; n; n = n.parent) n.height += diff;
}
function setValue(code) {
var top = {line: 0, ch: 0};
updateLines(top, {line: doc.size - 1, ch: getLine(doc.size-1).text.length},
splitLines(code), top, top);
updateInput = true;
}
function getValue(code) {
var text = [];
doc.iter(0, doc.size, function(line) { text.push(line.text); });
return text.join("\n");
}
function onMouseDown(e) {
// Check whether this is a click in a widget
for (var n = e_target(e); n != wrapper; n = n.parentNode)
if (n.parentNode == code && n != mover) return;
// See if this is a click in the gutter
for (var n = e_target(e); n != wrapper; n = n.parentNode)
if (n.parentNode == gutterText) {
if (options.onGutterClick)
options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e);
return e_preventDefault(e);
}
var start = posFromMouse(e);
switch (e_button(e)) {
case 3:
if (gecko && !mac) onContextMenu(e);
return;
case 2:
if (start) setCursor(start.line, start.ch, true);
return;
}
// For button 1, if it was clicked inside the editor
// (posFromMouse returning non-null), we have to adjust the
// selection.
if (!start) {if (e_target(e) == scroller) e_preventDefault(e); return;}
if (!focused) onFocus();
var now = +new Date;
if (lastDoubleClick > now - 400) {
e_preventDefault(e);
return selectLine(start.line);
} else if (lastClick > now - 400) {
lastDoubleClick = now;
e_preventDefault(e);
return selectWordAt(start);
} else { lastClick = now; }
var last = start, going;
if (dragAndDrop && !posEq(sel.from, sel.to) &&
!posLess(start, sel.from) && !posLess(sel.to, start)) {
// Let the drag handler handle this.
var up = connect(targetDocument, "mouseup", operation(function(e2) {
draggingText = false;
up();
if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
e_preventDefault(e2);
setCursor(start.line, start.ch, true);
focusInput();
}
}), true);
draggingText = true;
return;
}
e_preventDefault(e);
setCursor(start.line, start.ch, true);
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_preventDefault(e);
extend(e);
}), true);
var up = connect(targetDocument, "mouseup", operation(function(e) {
clearTimeout(going);
var cur = posFromMouse(e);
if (cur) setSelectionUser(start, cur);
e_preventDefault(e);
focusInput();
updateInput = true;
move(); up();
}), true);
}
function onDoubleClick(e) {
for (var n = e_target(e); n != wrapper; n = n.parentNode)
if (n.parentNode == gutterText) return e_preventDefault(e);
var start = posFromMouse(e);
if (!start) return;
lastDoubleClick = +new Date;
e_preventDefault(e);
selectWordAt(start);
}
function onDrop(e) {
e.preventDefault();
var pos = posFromMouse(e, true), files = e.dataTransfer.files;
if (!pos || options.readOnly) return;
if (files && files.length && window.FileReader && window.File) {
function loadFile(file, i) {
var reader = new FileReader;
reader.onload = function() {
text[i] = reader.result;
if (++read == n) {
pos = clipPos(pos);
var end = replaceRange(text.join(""), pos, pos);
setSelectionUser(pos, end);
}
};
reader.readAsText(file);
}
var n = files.length, text = Array(n), read = 0;
for (var i = 0; i < n; ++i) loadFile(files[i], i);
}
else {
try {
var text = e.dataTransfer.getData("Text");
if (text) {
var end = replaceRange(text, pos, pos);
var curFrom = sel.from, curTo = sel.to;
setSelectionUser(pos, end);
if (draggingText) replaceRange("", curFrom, curTo);
focusInput();
}
}
catch(e){}
}
}
function onDragStart(e) {
var txt = getSelection();
// This will reset escapeElement
htmlEscape(txt);
e.dataTransfer.setDragImage(escapeElement, 0, 0);
e.dataTransfer.setData("Text", txt);
}
function onKeyDown(e) {
if (!focused) onFocus();
var code = e.keyCode;
// IE does strange things with escape.
if (ie && code == 27) { e.returnValue = false; }
// Tries to detect ctrl on non-mac, cmd on mac.
var mod = (mac ? e.metaKey : e.ctrlKey) && !e.altKey, anyMod = e.ctrlKey || e.altKey || e.metaKey;
if (code == 16 || 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))) return;
if (code == 33 || code == 34) {scrollPage(code == 34); return e_preventDefault(e);} // 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_preventDefault(e);
}
if (mod && code == 65) {selectAll(); return e_preventDefault(e);} // ctrl-a
if (!options.readOnly) {
if (!anyMod && code == 13) {return;} // enter
if (!anyMod && code == 9 && handleTab(e.shiftKey)) return e_preventDefault(e); // tab
if (mod && code == 90) {undo(); return e_preventDefault(e);} // ctrl-z
if (mod && ((e.shiftKey && code == 90) || code == 89)) {redo(); return e_preventDefault(e);} // ctrl-shift-z, ctrl-y
}
if (code == 36) { if (options.smartHome) { smartHome(); return e_preventDefault(e); } }
// 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" : "") + (e.altKey ? "a" : "") + code;
if (sel.inverted && movementKeys[curKeyId] === true) {
var range = selRange(input);
if (range) {
reducedSelection = {anchor: range.start};
setSelRange(input, range.start, range.start);
}
}
// Don't save the key as a movementkey unless it had a modifier
if (!mod && !e.altKey) curKeyId = null;
fastPoll(curKeyId);
if (options.pollForIME && keyMightStartIME(code)) slowPollInterval = 50;
}
function onKeyUp(e) {
if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
if (reducedSelection) {
reducedSelection = null;
updateInput = true;
}
if (e.keyCode == 16) shiftSelecting = null;
if (slowPollInterval < 2000 && !alwaysPollForIME) slowPollInterval = 2000;
}
function onKeyPress(e) {
if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
if (options.electricChars && mode.electricChars) {
var ch = String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode);
if (mode.electricChars.indexOf(ch) > -1)
setTimeout(operation(function() {indentLine(sel.to.line, "smart");}), 50);
}
var code = e.keyCode;
// Re-stop tab and enter. Necessary on some browsers.
if (code == 13) {if (!options.readOnly) handleEnter(); e_preventDefault(e);}
else if (!e.ctrlKey && !e.altKey && !e.metaKey && code == 9 && options.tabMode != "default") e_preventDefault(e);
else fastPoll(curKeyId);
}
function onFocus() {
if (options.readOnly == "nocursor") return;
if (!focused) {
if (options.onFocus) options.onFocus(instance);
focused = true;
if (wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
wrapper.className += " CodeMirror-focused";
if (!leaveInputAlone) prepareInput();
}
slowPoll();
restartBlink();
}
function onBlur() {
if (focused) {
if (options.onBlur) options.onBlur(instance);
focused = false;
wrapper.className = wrapper.className.replace(" CodeMirror-focused", "");
}
clearInterval(blinker);
setTimeout(function() {if (!focused) shiftSelecting = null;}, 150);
}
// 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 = [];
doc.iter(from.line, to.line + 1, function(line) { old.push(line.text); });
history.addChange(from.line, newText.length, old);
while (history.done.length > options.undoDepth) history.done.shift();
}
updateLinesNoUndo(from, to, newText, selFrom, selTo);
}
function unredoHelper(from, to) {
var change = from.pop();
if (change) {
var replaced = [], end = change.start + change.added;
doc.iter(change.start, end, function(line) { replaced.push(line.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: getLine(end-1).text.length}, change.old, pos, pos);
updateInput = true;
}
}
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;
if (!options.lineWrapping)
doc.iter(from.line, to.line, function(line) {
if (line.text.length == maxLineLength) {recomputeMaxLength = true; return true;}
});
var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(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 added = [];
firstLine.replace(from.ch, null, newText[0]);
for (var i = 1, e = newText.length - 1; i < e; ++i)
added.push(Line.inheritMarks(newText[i], firstLine));
added.push(lastLine);
doc.insert(from.line + 1, added);
}
}
else if (newText.length == 1) {
firstLine.replace(from.ch, null, newText[0]);
lastLine.replace(null, to.ch, "");
firstLine.append(lastLine);
doc.remove(from.line + 1, nlines);
}
else {
var added = [];
firstLine.replace(from.ch, null, newText[0]);
lastLine.replace(null, to.ch, newText[newText.length-1]);
for (var i = 1, e = newText.length - 1; i < e; ++i)
added.push(Line.inheritMarks(newText[i], firstLine));
if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
doc.insert(from.line + 1, added);
}
if (options.lineWrapping) {
var perLine = scroller.clientWidth / charWidth() - 3;
doc.iter(from.line, from.line + newText.length, function(line) {
if (line.hidden) return;
var guess = Math.ceil(line.text.length / perLine) || 1;
if (guess != line.height) updateLineHeight(line, guess);
});
} else {
doc.iter(from.line, i + newText.length, function(line) {
var l = line.text;
if (l.length > maxLineLength) {
maxLine = l; maxLineLength = l.length; maxWidth = null;
recomputeMaxLength = false;
}
});
if (recomputeMaxLength) {
maxLineLength = 0; maxLine = ""; maxWidth = null;
doc.iter(0, doc.size, function(line) {
var l = line.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 < 5) {
highlightLines(from.line, from.line + newText.length);
newWork.push(from.line + newText.length);
} else {
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 = (doc.height * textHeight() + 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 getLine(l1).text.slice(from.ch, to.ch);
var code = [getLine(l1).text.slice(from.ch)];
doc.iter(l1 + 1, l2, function(line) { code.push(line.text); });
code.push(getLine(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(slowPollInterval, function() {
startOperation();
readInput();
if (focused) slowPoll();
endOperation();
});
}
function fastPoll(keyId) {
var missed = false;
pollingFast = true;
function p() {
startOperation();
var changed = readInput();
if (changed && keyId) {
if (changed == "moved" && movementKeys[keyId] == null) movementKeys[keyId] = true;
if (changed == "changed") movementKeys[keyId] = false;
}
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 || !focused) 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(doc.size, sel.to.line + 2);
doc.iter(from, to, function(line) { text.push(line.text); });
text = input.value = text.join(lineSep);
var startch = sel.from.ch, endch = sel.to.ch;
doc.iter(from, sel.from.line, function(line) {
startch += lineSep.length + line.text.length;
});
doc.iter(from, sel.to.line, function(line) {
endch += lineSep.length + line.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 scrollEditorIntoView() {
if (!cursor.getBoundingClientRect) return;
var rect = cursor.getBoundingClientRect();
var winH = window.innerHeight || Math.max(document.body.offsetHeight, document.documentElement.offsetHeight);
if (rect.top < 0 || rect.bottom > winH) cursor.scrollIntoView();
}
function scrollCursorIntoView() {
var cursor = localCoords(sel.inverted ? sel.from : sel.to);
var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;
return scrollIntoView(x, cursor.y, x, cursor.yBot);
}
function scrollIntoView(x1, y1, x2, y2) {
var pl = paddingLeft(), pt = paddingTop(), lh = textHeight();
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;
var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
if (x1 < screenleft + gutterw) {
if (x1 < 50) x1 = 0;
scroller.scrollLeft = Math.max(0, x1 - 10 - gutterw);
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 = textHeight(), top = scroller.scrollTop - paddingTop();
var from_height = Math.max(0, Math.floor(top / lh));
var to_height = Math.ceil((top + scroller.clientHeight) / lh);
return {from: lineAtHeight(doc, from_height),
to: lineAtHeight(doc, to_height)};
}
// 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 = displayOffset = 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(doc.size, 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 (to - pos != domEnd - domPos) gutterDirty = true;
}
if (!updates.length) return;
var th = textHeight();
lineDiv.style.display = gutter.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, doc.size));
// 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;
if (different) lastHeight = scroller.clientHeight;
showingFrom = from; showingTo = to;
displayOffset = heightAtLine(doc, from);
mover.style.top = (displayOffset * th) + "px";
code.style.height = (doc.height * th + 2 * paddingTop()) + "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);
if (options.lineWrapping) {
maxWidth = scroller.clientWidth;
var curNode = lineDiv.firstChild;
doc.iter(showingFrom, showingTo, function(line) {
if (!line.hidden) {
var height = Math.round(curNode.offsetHeight / th) || 1;
if (line.height != height) {updateLineHeight(line, height); gutterDirty = true;}
}
curNode = curNode.nextSibling;
});
} else {
if (maxWidth == null) maxWidth = stringWidth(maxLine);
if (maxWidth > scroller.clientWidth) {
lineSpace.style.width = maxWidth + "px";
// Needed to prevent odd wrapping/hiding of widgets placed in here.
code.style.width = "";
code.style.width = scroller.scrollWidth + "px";
} else {
lineSpace.style.width = code.style.width = "";
}
}
gutter.style.display = "";
if (different || gutterDirty) updateGutter();
updateCursor();
}
function refreshDisplay(from, to) {
var start = {line: from, ch: 0}, inSel = posLess(sel.from, start) && !posLess(sel.to, start);
var i = from, html = [];
doc.iter(from, to, function(line) {
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;}
}
if (line.hidden) html.push("<pre></pre>");
else html.push(line.getHTML(ch1, ch2, true));
++i;
});
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;
var j = rec.from;
doc.iter(rec.from, rec.to, function(line) {
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) {
if (line.hidden) scratch.innerHTML = "<pre></pre>";
else scratch.innerHTML = line.getHTML(ch1, ch2, true);
lineDiv.insertBefore(scratch.firstChild, nodeAfter);
} else {
if (line.hidden) node.innerHTML = "";
else node.innerHTML = line.getHTML(ch1, ch2, false);
node.className = line.className || "";
node = node.nextSibling;
}
++j;
});
off += extra;
}
}
function updateGutter() {
if (!options.gutter && !options.lineNumbers) return;
var hText = mover.offsetHeight, hEditor = scroller.clientHeight;