<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="js/codemirror.js" type="text/javascript"></script>
<title>CodeMirror: JavaScript demonstration</title>
<link rel="stylesheet" type="text/css" href="css/docs.css"/>
</head>
<body style="padding: 20px;">
<p>This page demonstrates <a href="index.html">CodeMirror</a>'s
JavaScript parser. Note that the ugly buttons at the top are not are
not part of CodeMirror proper -- they demonstrate the way it can be
embedded in a web-application.</p>
<div class="border">
<textarea id="code" cols="120" rows="30">
/* The Editor object manages the content of the editable frame. It
* catches events, colours nodes, and indents lines. This file also
* holds some functions for transforming arbitrary DOM structures into
* plain sequences of <span> and <br> elements
*/
// Make sure a string does not contain two consecutive 'collapseable'
// whitespace characters.
function makeWhiteSpace(n) {
var buffer = [], nb = true;
for (; n > 0; n--) {
buffer.push((nb || n == 1) ? nbsp : " ");
nb = !nb;
}
return buffer.join("");
}
// Create a set of white-space characters that will not be collapsed
// by the browser, but will not break text-wrapping either.
function fixSpaces(string) {
if (string.charAt(0) == " ") string = nbsp + string.slice(1);
return string.replace(/[\t \u00a0]{2,}/g, function(s) {return makeWhiteSpace(s.length);});
}
function cleanText(text) {
return text.replace(/\u00a0/g, " ").replace(/\u200b/g, "");
}
// Create a SPAN node with the expected properties for document part
// spans.
function makePartSpan(value, doc) {
var text = value;
if (value.nodeType == 3) text = value.nodeValue;
else value = doc.createTextNode(text);
var span = doc.createElement("SPAN");
span.isPart = true;
span.appendChild(value);
span.currentText = text;
return span;
}
// On webkit, when the last BR of the document does not have text
// behind it, the cursor can not be put on the line after it. This
// makes pressing enter at the end of the document occasionally do
// nothing (or at least seem to do nothing). To work around it, this
// function makes sure the document ends with a span containing a
// zero-width space character. The traverseDOM iterator filters such
// character out again, so that the parsers won't see them. This
// function is called from a few strategic places to make sure the
// zwsp is restored after the highlighting process eats it.
var webkitLastLineHack = webkit ?
function(container) {
var last = container.lastChild;
if (!last || !last.isPart || last.textContent != "\u200b")
container.appendChild(makePartSpan("\u200b", container.ownerDocument));
} : function() {};
var Editor = (function(){
// The HTML elements whose content should be suffixed by a newline
// when converting them to flat text.
var newlineElements = {"P": true, "DIV": true, "LI": true};
function asEditorLines(string) {
return fixSpaces(string.replace(/\t/g, " ").replace(/\u00a0/g, " ")).replace(/\r\n?/g, "\n").split("\n");
}
// Helper function for traverseDOM. Flattens an arbitrary DOM node
// into an array of textnodes and <br> tags.
function simplifyDOM(root) {
var doc = root.ownerDocument;
var result = [];
var leaving = true;
function simplifyNode(node) {
if (node.nodeType == 3) {
var text = node.nodeValue = fixSpaces(node.nodeValue.replace(/[\r\u200b]/g, "").replace(/\n/g, " "));
if (text.length) leaving = false;
result.push(node);
}
else if (node.nodeName == "BR" && node.childNodes.length == 0) {
leaving = true;
result.push(node);
}
else {
forEach(node.childNodes, simplifyNode);
if (!leaving && newlineElements.hasOwnProperty(node.nodeName)) {
leaving = true;
result.push(doc.createElement("BR"));
}
}
}
simplifyNode(root);
return result;
}
// Creates a MochiKit-style iterator that goes over a series of DOM
// nodes. The values it yields are strings, the textual content of
// the nodes. It makes sure that all nodes up to and including the
// one whose text is being yielded have been 'normalized' to be just
// <span> and <br> elements.
// See the story.html file for some short remarks about the use of
// continuation-passing style in this iterator.
function traverseDOM(start){
function yield(value, c){cc = c; return value;}
function push(fun, arg, c){return function(){return fun(arg, c);};}
function stop(){cc = stop; throw StopIteration;};
var cc = push(scanNode, start, stop);
var owner = start.ownerDocument;
var nodeQueue = [];
// Create a function that can be used to insert nodes after the
// one given as argument.
function pointAt(node){
var parent = node.parentNode;
var next = node.nextSibling;
return function(newnode) {
parent.insertBefore(newnode, next);
};
}
var point = null;
// Insert a normalized node at the current point. If it is a text
// node, wrap it in a <span>, and give that span a currentText
// property -- this is used to cache the nodeValue, because
// directly accessing nodeValue is horribly slow on some browsers.
// The dirty property is used by the highlighter to determine
// which parts of the document have to be re-highlighted.
function insertPart(part){
var text = "\n";
if (part.nodeType == 3) {
select.snapshotChanged();
part = makePartSpan(part, owner);
text = part.currentText;
}
part.dirty = true;
nodeQueue.push(part);
point(part);
return text;
}
// Extract the text and newlines from a DOM node, insert them into
// the document, and yield the textual content. Used to replace
// non-normalized nodes.
function writeNode(node, c){
var toYield = [];
forEach(simplifyDOM(node), function(part) {
toYield.push(insertPart(part));
});
return yield(toYield.join(""), c);
}
// Check whether a node is a normalized <span> element.
function partNode(node){
if (node.isPart && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
node.currentText = node.firstChild.nodeValue;
return !/[\n\t\r]/.test(node.currentText);
}
return false;
}
// Handle a node. Add its successor to the continuation if there
// is one, find out whether the node is normalized. If it is,
// yield its content, otherwise, normalize it (writeNode will take
// care of yielding).
function scanNode(node, c){
if (node.nextSibling)
c = push(scanNode, node.nextSibling, c);
if (partNode(node)){
nodeQueue.push(node);
return yield(node.currentText, c);
}
else if (node.nodeName == "BR") {
nodeQueue.push(node);
return yield("\n", c);
}
else {
point = pointAt(node);
removeElement(node);
return writeNode(node, c);
}
}
// MochiKit iterators are objects with a next function that
// returns the next value or throws StopIteration when there are
// no more values.
return {next: function(){return cc();}, nodes: nodeQueue};
}
// Determine the text size of a processed node.
function nodeSize(node) {
if (node.nodeName == "BR")
return 1;
else
return node.currentText.length;
}
// Search backwards through the top-level nodes until the next BR or
// the start of the frame.
function startOfLine(node) {
while (node && node.nodeName != "BR") node = node.previousSibling;
return node;
}
function endOfLine(node, container) {
if (!node) node = container.firstChild;
else if (node.nodeName == "BR") node = node.nextSibling;
while (node && node.nodeName != "BR") node = node.nextSibling;
return node;
}
// Replace all DOM nodes in the current selection with new ones.
// Needed to prevent issues in IE where the old DOM nodes can be
// pasted back into the document, still holding their old undo
// information.
function scrubPasted(container, start, start2) {
var end = select.selectionTopNode(container, true),
doc = container.ownerDocument;
if (start != null && start.parentNode != container) start = start2;
if (start === false) start = null;
if (start == end || !end || !container.firstChild) return;
var clear = traverseDOM(start ? start.nextSibling : container.firstChild);
while (end.parentNode == container) try{clear.next();}catch(e){break;}
forEach(clear.nodes, function(node) {
var newNode = node.nodeName == "BR" ? doc.createElement("BR") : makePartSpan(node.currentText, doc);
container.replaceChild(newNode, node);
});
}
// Client interface for searching the content of the editor. Create
// these by calling CodeMirror.getSearchCursor. To use, call
// findNext on the resulting object -- this returns a boolean
// indicating whether anything was found, and can be called again to
// skip to the next find. Use the select and replace methods to
// actually do something with the found locations.
function SearchCursor(editor, string, fromCursor) {
this.editor = editor;
this.history = editor.history;
this.history.commit();
// Are we currently at an occurrence of the search string?
this.atOccurrence = false;
// The object stores a set of nodes coming after its current
// position, so that when the current point is taken out of the
// DOM tree, we can still try to continue.
this.fallbackSize = 15;
var cursor;
// Start from the cursor when specified and a cursor can be found.
if (fromCursor && (cursor = select.cursorPos(this.editor.container))) {
this.line = cursor.node;
this.offset = cursor.offset;
}
else {
this.line = null;
this.offset = 0;
}
this.valid = !!string;
// Create a matcher function based on the kind of string we have.
var target = string.split("\n"), self = this;;
this.matches = (target.length == 1) ?
// For one-line strings, searching can be done simply by calling
// indexOf on the current line.
function() {
var match = cleanText(self.history.textAfter(self.line).slice(self.offset)).indexOf(string);
if (match > -1)
return {from: {node: self.line, offset: self.offset + match},
to: {node: self.line, offset: self.offset + match + string.length}};
} :
// Multi-line strings require internal iteration over lines, and
// some clunky checks to make sure the first match ends at the
// end of the line and the last match starts at the start.
function() {
var firstLine = cleanText(self.history.textAfter(self.line).slice(self.offset));
var match = firstLine.lastIndexOf(target[0]);
if (match == -1 || match != firstLine.length - target[0].length)
return false;
var startOffset = self.offset + match;
var line = self.history.nodeAfter(self.line);
for (var i = 1; i < target.length - 1; i++) {
if (cleanText(self.history.textAfter(line)) != target[i])
return false;
line = self.history.nodeAfter(line);
}
if (cleanText(self.history.textAfter(line)).indexOf(target[target.length - 1]) != 0)
return false;
return {from: {node: self.line, offset: startOffset},
to: {node: line, offset: target[target.length - 1].length}};
};
}
SearchCursor.prototype = {
findNext: function() {
if (!this.valid) return false;
this.atOccurrence = false;
var self = this;
// Go back to the start of the document if the current line is
// no longer in the DOM tree.
if (this.line && !this.line.parentNode) {
this.line = null;
this.offset = 0;
}
// Set the cursor's position one character after the given
// position.
function saveAfter(pos) {
if (self.history.textAfter(pos.node).length < pos.offset) {
self.line = pos.node;
self.offset = pos.offset + 1;
}
else {
self.line = self.history.nodeAfter(pos.node);
self.offset = 0;
}
}
while (true) {
var match = this.matches();
// Found the search string.
if (match) {
this.atOccurrence = match;
saveAfter(match.from);
return true;
}
this.line = this.history.nodeAfter(this.line);
this.offset = 0;
// End of document.
if (!this.line) {
this.valid = false;
return false;
}
}
},
select: function() {
if (this.atOccurrence) {
select.setCursorPos(this.editor.container, this.atOccurrence.from, this.atOccurrence.to);
select.scrollToCursor(this.editor.container);
}
},
replace: function(string) {
if (this.atOccurrence) {
var end = this.editor.replaceRange(this.atOccurrence.from, this.atOccurrence.to, string);
this.line = end.node;
this.offset = end.offset;
this.atOccurrence = false;
}
}
};
// The Editor object is the main inside-the-iframe interface.
function Editor(options) {
this.options = options;
window.indentUnit = options.indentUnit;
this.parent = parent;
this.doc = document;
var container = this.container = this.doc.body;
this.win = window;
this.history = new History(container, options.undoDepth, options.undoDelay,
this, options.onChange);
var self = this;
if (!Editor.Parser)
throw "No parser loaded.";
if (options.parserConfig && Editor.Parser.configure)
Editor.Parser.configure(options.parserConfig);
if (!options.readOnly)
select.setCursorPos(container, {node: null, offset: 0});
this.dirty = [];
if (options.content)
this.importCode(options.content);
else // FF acts weird when the editable document is completely empty
container.appendChild(this.doc.createElement("BR"));
if (!options.readOnly) {
if (options.continuousScanning !== false) {
this.scanner = this.documentScanner(options.linesPerPass);
this.delayScanning();
}
function setEditable() {
// In IE, designMode frames can not run any scripts, so we use
// contentEditable instead.
if (document.body.contentEditable != undefined && internetExplorer)
document.body.contentEditable = "true";
else
document.designMode = "on";
document.documentElement.style.borderWidth = "0";
if (!options.textWrapping)
container.style.whiteSpace = "nowrap";
}
// If setting the frame editable fails, try again when the user
// focus it (happens when the frame is not visible on
// initialisation, in Firefox).
try {
setEditable();
}
catch(e) {
var focusEvent = addEventHandler(document, "focus", function() {
focusEvent();
setEditable();
}, true);
}
addEventHandler(document, "keydown", method(this, "keyDown"));
addEventHandler(document, "keypress", method(this, "keyPress"));
addEventHandler(document, "keyup", method(this, "keyUp"));
function cursorActivity() {self.cursorActivity(false);}
addEventHandler(document.body, "mouseup", cursorActivity);
addEventHandler(document.body, "paste", function(event) {
cursorActivity();
if (internetExplorer) {
var text = null;
try {text = window.clipboardData.getData("Text");}catch(e){}
if (text != null) {
self.replaceSelection(text);
event.stop();
}
else {
var start = select.selectionTopNode(self.container, true),
start2 = start && start.previousSibling;
setTimeout(function(){scrubPasted(self.container, start, start2);}, 0);
}
}
});
addEventHandler(document.body, "cut", cursorActivity);
if (this.options.autoMatchParens)
addEventHandler(document.body, "click", method(this, "scheduleParenBlink"));
}
}
function isSafeKey(code) {
return (code >= 16 && code <= 18) || // shift, control, alt
(code >= 33 && code <= 40); // arrows, home, end
}
Editor.prototype = {
// Import a piece of code into the editor.
importCode: function(code) {
this.history.push(null, null, asEditorLines(code));
this.history.reset();
},
// Extract the code from the editor.
getCode: function() {
if (!this.container.firstChild)
return "";
var accum = [];
select.markSelection(this.win);
forEach(traverseDOM(this.container.firstChild), method(accum, "push"));
webkitLastLineHack(this.container);
select.selectMarked();
return cleanText(accum.join(""));
},
checkLine: function(node) {
if (node === false || !(node == null || node.parentNode == this.container))
throw parent.CodeMirror.InvalidLineHandle;
},
cursorPosition: function(start) {
if (start == null) start = true;
var pos = select.cursorPos(this.container, start);
if (pos) return {line: pos.node, character: pos.offset};
else return {line: null, character: 0};
},
firstLine: function() {
return null;
},
lastLine: function() {
if (this.container.lastChild) return startOfLine(this.container.lastChild);
else return null;
},
nextLine: function(line) {
this.checkLine(line);
var end = endOfLine(line, this.container);
return end || false;
},
prevLine: function(line) {
this.checkLine(line);
if (line == null) return false;
return startOfLine(line.previousSibling);
},
selectLines: function(startLine, startOffset, endLine, endOffset) {
this.checkLine(startLine);
var start = {node: startLine, offset: startOffset}, end = null;
if (endOffset !== undefined) {
this.checkLine(endLine);
end = {node: endLine, offset: endOffset};
}
select.setCursorPos(this.container, start, end);
select.scrollToCursor(this.container);
},
lineContent: function(line) {
this.checkLine(line);
var accum = [];
for (line = line ? line.nextSibling : this.container.firstChild;
line && line.nodeName != "BR"; line = line.nextSibling)
accum.push(nodeText(line));
return cleanText(accum.join(""));
},
setLineContent: function(line, content) {
this.history.commit();
this.replaceRange({node: line, offset: 0},
{node: line, offset: this.history.textAfter(line).length},
content);
this.addDirtyNode(line);
this.scheduleHighlight();
},
insertIntoLine: function(line, position, content) {
var before = null;
if (position == "end") {
before = endOfLine(line, this.container);
}
else {
for (var cur = line ? line.nextSibling : this.container.firstChild; cur; cur = cur.nextSibling) {
if (position == 0) {
before = cur;
break;
}
var text = (cur.innerText || cur.textContent || cur.nodeValue || "");
if (text.length > position) {
before = cur.nextSibling;
content = text.slice(0, position) + content + text.slice(position);
removeElement(cur);
break;
}
position -= text.length;
}
}
var lines = asEditorLines(content), doc = this.container.ownerDocument;
for (var i = 0; i < lines.length; i++) {
if (i > 0) this.container.insertBefore(doc.createElement("BR"), before);
this.container.insertBefore(makePartSpan(lines[i], doc), before);
}
this.addDirtyNode(line);
this.scheduleHighlight();
},
// Retrieve the selected text.
selectedText: function() {
var h = this.history;
h.commit();
var start = select.cursorPos(this.container, true),
end = select.cursorPos(this.container, false);
if (!start || !end) return "";
if (start.node == end.node)
return h.textAfter(start.node).slice(start.offset, end.offset);
var text = [h.textAfter(start.node).slice(start.offset)];
for (pos = h.nodeAfter(start.node); pos != end.node; pos = h.nodeAfter(pos))
text.push(h.textAfter(pos));
text.push(h.textAfter(end.node).slice(0, end.offset));
return cleanText(text.join("\n"));
},
// Replace the selection with another piece of text.
replaceSelection: function(text) {
this.history.commit();
var start = select.cursorPos(this.container, true),
end = select.cursorPos(this.container, false);
if (!start || !end) return;
end = this.replaceRange(start, end, text);
select.setCursorPos(this.container, start, end);
},
replaceRange: function(from, to, text) {
var lines = asEditorLines(text);
lines[0] = this.history.textAfter(from.node).slice(0, from.offset) + lines[0];
var lastLine = lines[lines.length - 1];
lines[lines.length - 1] = lastLine + this.history.textAfter(to.node).slice(to.offset);
var end = this.history.nodeAfter(to.node);
this.history.push(from.node, end, lines);
return {node: this.history.nodeBefore(end),
offset: lastLine.length};
},
getSearchCursor: function(string, fromCursor) {
return new SearchCursor(this, string, fromCursor);
},
// Re-indent the whole buffer
reindent: function() {
if (this.container.firstChild)
this.indentRegion(null, this.container.lastChild);
},
grabKeys: function(eventHandler, filter) {
this.frozen = eventHandler;
this.keyFilter = filter;
},
ungrabKeys: function() {
this.frozen = "leave";
this.keyFilter = null;
},
// Intercept enter and tab, and assign their new functions.
keyDown: function(event) {
if (this.frozen == "leave") this.frozen = null;
if (this.frozen && (!this.keyFilter || this.keyFilter(event.keyCode))) {
event.stop();
this.frozen(event);
return;
}
var code = event.keyCode;
// Don't scan when the user is typing.
this.delayScanning();
// Schedule a paren-highlight event, if configured.
if (this.options.autoMatchParens)
this.scheduleParenBlink();
if (code == 13) { // enter
if (event.ctrlKey) {
this.reparseBuffer();
}
else {
select.insertNewlineAtCursor(this.win);
this.indentAtCursor();
select.scrollToCursor(this.container);
}
event.stop();
}
else if (code == 9 && this.options.tabMode != "default") { // tab
this.handleTab(!event.ctrlKey && !event.shiftKey);
event.stop();
}
else if (code == 32 && event.shiftKey && this.options.tabMode == "default") { // space
this.handleTab(true);
event.stop();
}
else if ((code == 219 || code == 221) && event.ctrlKey) {
this.blinkParens(event.shiftKey);
event.stop();
}
else if (event.metaKey && (code == 37 || code == 39)) { // Meta-left/right
var cursor = select.selectionTopNode(this.container);
if (cursor === false || !this.container.firstChild) return;
if (code == 37) select.focusAfterNode(startOfLine(cursor), this.container);
else {
end = endOfLine(cursor, this.container);
select.focusAfterNode(end ? end.previousSibling : this.container.lastChild, this.container);
}
event.stop();
}
else if (event.ctrlKey || event.metaKey) {
if ((event.shiftKey && code == 90) || code == 89) { // shift-Z, Y
select.scrollToNode(this.history.redo());
event.stop();
}
else if (code == 90 || code == 8) { // Z, backspace
select.scrollToNode(this.history.undo());
event.stop();
}
else if (code == 83 && this.options.saveFunction) { // S
this.options.saveFunction();
event.stop();
}
}
},
// Check for characters that should re-indent the current line,
// and prevent Opera from handling enter and tab anyway.
keyPress: function(event) {
var electric = /indent|default/.test(this.options.tabMode) && Editor.Parser.electricChars;
// Hack for Opera, and Firefox on OS X, in which stopping a
// keydown event does not prevent the associated keypress event
// from happening, so we have to cancel enter and tab again
// here.
if ((this.frozen && (!this.keyFilter || this.keyFilter(event.keyCode))) ||
event.code == 13 || (event.code == 9 && this.options.tabMode != "default") ||
(event.keyCode == 32 && event.shiftKey && this.options.tabMode == "default"))
event.stop();
else if (electric && electric.indexOf(event.character) != -1)
this.parent.setTimeout(method(this, "indentAtCursor"), 0);
},
// Mark the node at the cursor dirty when a non-safe key is
// released.
keyUp: function(event) {
this.cursorActivity(isSafeKey(event.keyCode));
},
// Indent the line following a given <br>, or null for the first
// line. If given a <br> element, this must have been highlighted
// so that it has an indentation method. Returns the whitespace
// element that has been modified or created (if any).
indentLineAfter: function(start, direction) {
// whiteSpace is the whitespace span at the start of the line,
// or null if there is no such node.
var whiteSpace = start ? start.nextSibling : this.container.firstChild;
if (whiteSpace && !hasClass(whiteSpace, "whitespace"))
whiteSpace = null;
// Sometimes the start of the line can influence the correct
// indentation, so we retrieve it.
var firstText = whiteSpace ? whiteSpace.nextSibling : (start ? start.nextSibling : this.container.firstChild);
var nextChars = (start && firstText && firstText.currentText) ? firstText.currentText : "";
// Ask the lexical context for the correct indentation, and
// compute how much this differs from the current indentation.
var newIndent = 0, curIndent = whiteSpace ? whiteSpace.currentText.length : 0;
if (direction != null && this.options.tabMode == "shift")
newIndent = direction ? curIndent + indentUnit : Math.max(0, curIndent - indentUnit)
else if (start)
newIndent = start.indentation(nextChars, curIndent, direction);
else if (Editor.Parser.firstIndentation)
newIndent = Editor.Parser.firstIndentation(nextChars, curIndent, direction);
var indentDiff = newIndent - curIndent;
// If there is too much, this is just a matter of shrinking a span.
if (indentDiff < 0) {
if (newIndent == 0) {
if (firstText) select.snapshotMove(whiteSpace.firstChild, firstText.firstChild, 0);
removeElement(whiteSpace);
whiteSpace = null;
}
else {
select.snapshotMove(whiteSpace.firstChild, whiteSpace.firstChild, indentDiff, true);
whiteSpace.currentText = makeWhiteSpace(newIndent);
whiteSpace.firstChild.nodeValue = whiteSpace.currentText;
}
}
// Not enough...
else if (indentDiff > 0) {
// If there is whitespace, we grow it.
if (whiteSpace) {
whiteSpace.currentText = makeWhiteSpace(newIndent);
whiteSpace.firstChild.nodeValue = whiteSpace.currentText;
}
// Otherwise, we have to add a new whitespace node.
else {
whiteSpace = makePartSpan(makeWhiteSpace(newIndent), this.doc);
whiteSpace.className = "whitespace";
if (start) insertAfter(whiteSpace, start);
else this.container.insertBefore(whiteSpace, this.container.firstChild);
}
if (firstText) select.snapshotMove(firstText.firstChild, whiteSpace.firstChild, curIndent, false, true);
}
if (indentDiff != 0) this.addDirtyNode(start);
return whiteSpace;
},
// Re-highlight the selected part of the document.
highlightAtCursor: function() {
var pos = select.selectionTopNode(this.container, true);
var to = select.selectionTopNode(this.container, false);
if (pos === false || to === false) return;
select.markSelection(this.win);
if (this.highlight(pos, endOfLine(to, this.container), true, 20) === false)
return false;
select.selectMarked();
return true;
},
// When tab is pressed with text selected, the whole selection is
// re-indented, when nothing is selected, the line with the cursor
// is re-indented.
handleTab: function(direction) {
if (this.options.tabMode == "spaces") {
select.insertTabAtCursor(this.win);
}
else if (!select.somethingSelected(this.win)) {
this.indentAtCursor(direction);
}
else {
var start = select.selectionTopNode(this.container, true),
end = select.selectionTopNode(this.container, false);
if (start === false || end === false) return;
this.indentRegion(start, end, direction);
}
},
// Delay (or initiate) the next paren blink event.
scheduleParenBlink: function() {
if (this.parenEvent) this.parent.clearTimeout(this.parenEvent);
var self = this;
this.parenEvent = this.parent.setTimeout(function(){self.blinkParens();}, 300);
},
// Take the token before the cursor. If it contains a character in
// '()[]{}', search for the matching paren/brace/bracket, and
// highlight them in green for a moment, or red if no proper match
// was found.
blinkParens: function(jump) {
// Clear the event property.
if (this.parenEvent) this.parent.clearTimeout(this.parenEvent);
this.parenEvent = null;
// Extract a 'paren' from a piece of text.
function paren(node) {
if (node.currentText) {
var match = node.currentText.match(/^[\s\u00a0]*([\(\)\[\]{}])[\s\u00a0]*$/);
return match && match[1];
}
}
// Determine the direction a paren is facing.
function forward(ch) {
return /[\(\[\{]/.test(ch);
}
var ch, self = this, cursor = select.selectionTopNode(this.container, true);
if (!cursor || !this.highlightAtCursor()) return;
cursor = select.selectionTopNode(this.container, true);
if (!(cursor && ((ch = paren(cursor)) || (cursor = cursor.nextSibling) && (ch = paren(cursor)))))
return;
// We only look for tokens with the same className.
var className = cursor.className, dir = forward(ch), match = matching[ch];
// Since parts of the document might not have been properly
// highlighted, and it is hard to know in advance which part we
// have to scan, we just try, and when we find dirty nodes we
// abort, parse them, and re-try.
function tryFindMatch() {
var stack = [], ch, ok = true;;
for (var runner = cursor; runner; runner = dir ? runner.nextSibling : runner.previousSibling) {
if (runner.className == className && runner.nodeName == "SPAN" && (ch = paren(runner))) {
if (forward(ch) == dir)
stack.push(ch);
else if (!stack.length)
ok = false;
else if (stack.pop() != matching[ch])
ok = false;
if (!stack.length) break;
}
else if (runner.dirty || runner.nodeName != "SPAN" && runner.nodeName != "BR") {
return {node: runner, status: "dirty"};
}
}
return {node: runner, status: runner && ok};
}
// Temporarily give the relevant nodes a colour.
function blink(node, ok) {
node.style.fontWeight = "bold";
node.style.color = ok ? "#8F8" : "#F88";
self.parent.setTimeout(function() {node.style.fontWeight = ""; node.style.color = "";}, 500);
}
while (true) {
var found = tryFindMatch();
if (found.status == "dirty") {
this.highlight(found.node, 1);
// Needed because in some corner cases a highlight does not
// reach a node.
found.node.dirty = false;
continue;
}
else {
blink(cursor, found.status);
if (found.node) {
blink(found.node, found.status);
if (jump) select.focusAfterNode(found.node.previousSibling, this.container);
}
break;
}
}
},
// Adjust the amount of whitespace at the start of the line that
// the cursor is on so that it is indented properly.
indentAtCursor: function(direction) {
if (!this.container.firstChild) return;
// The line has to have up-to-date lexical information, so we
// highlight it first.
if (!this.highlightAtCursor()) return;
var cursor = select.selectionTopNode(this.container, false);
// If we couldn't determine the place of the cursor,
// there's nothing to indent.
if (cursor === false)
return;
var lineStart = startOfLine(cursor);
var whiteSpace = this.indentLineAfter(lineStart, direction);
if (cursor == lineStart && whiteSpace)
cursor = whiteSpace;
// This means the indentation has probably messed up the cursor.
if (cursor == whiteSpace)
select.focusAfterNode(cursor, this.container);
},
// Indent all lines whose start falls inside of the current
// selection.
indentRegion: function(start, end, direction) {
var current = (start = startOfLine(start)), before = start && startOfLine(start.previousSibling);
if (end.nodeName != "BR") end = endOfLine(end, this.container);
do {
if (current) this.highlight(before, current, true);
this.indentLineAfter(current, direction);
before = current;
current = endOfLine(current, this.container);
} while (current != end);
select.setCursorPos(this.container, {node: start, offset: 0}, {node: end, offset: 0});
},
// Find the node that the cursor is in, mark it as dirty, and make
// sure a highlight pass is scheduled.
cursorActivity: function(safe) {
if (internetExplorer) {
this.container.createTextRange().execCommand("unlink");
this.selectionSnapshot = select.selectionCoords(this.win);
}
var activity = this.options.cursorActivity;
if (!safe || activity) {
var cursor = select.selectionTopNode(this.container, false);
if (cursor === false || !this.container.firstChild) return;
cursor = cursor || this.container.firstChild;
if (activity) activity(cursor);
if (!safe) {
this.scheduleHighlight();
this.addDirtyNode(cursor);
}
}
},
reparseBuffer: function() {
forEach(this.container.childNodes, function(node) {node.dirty = true;});
if (this.container.firstChild)
this.addDirtyNode(this.container.firstChild);
},
// Add a node to the set of dirty nodes, if it isn't already in
// there.
addDirtyNode: function(node) {
node = node || this.container.firstChild;
if (!node) return;
for (var i = 0; i < this.dirty.length; i++)
if (this.dirty[i] == node) return;
if (node.nodeType != 3)
node.dirty = true;
this.dirty.push(node);
},
// Cause a highlight pass to happen in options.passDelay
// milliseconds. Clear the existing timeout, if one exists. This
// way, the passes do not happen while the user is typing, and
// should as unobtrusive as possible.
scheduleHighlight: function() {
// Timeouts are routed through the parent window, because on
// some browsers designMode windows do not fire timeouts.
var self = this;
this.parent.clearTimeout(this.highlightTimeout);
this.highlightTimeout = this.parent.setTimeout(function(){self.highlightDirty();}, this.options.passDelay);
},
// Fetch one dirty node, and remove it from the dirty set.
getDirtyNode: function() {
while (this.dirty.length > 0) {
var found = this.dirty.pop();
// IE8 sometimes throws an unexplainable 'invalid argument'
// exception for found.parentNode
try {
// If the node has been coloured in the meantime, or is no
// longer in the document, it should not be returned.
while (found && found.parentNode != this.container)
found = found.parentNode
if (found && (found.dirty || found.nodeType == 3))
return found;
} catch (e) {}
}
return null;
},
// Pick dirty nodes, and highlight them, until
// options.linesPerPass lines have been highlighted. The highlight
// method will continue to next lines as long as it finds dirty
// nodes. It returns an object indicating the amount of lines
// left, and information about the place where it stopped. If
// there are dirty nodes left after this function has spent all
// its lines, it shedules another highlight to finish the job.
highlightDirty: function(force) {
// Prevent FF from raising an error when it is firing timeouts
// on a page that's no longer loaded.
if (!window.select) return;
var lines = force ? Infinity : this.options.linesPerPass;
if (!this.options.readOnly) select.markSelection(this.win);
var start;
while (lines > 0 && (start = this.getDirtyNode())){
var result = this.highlight(start, lines);
if (result) {
lines = result.left;
if (result.node && result.dirty)
this.addDirtyNode(result.node);
}
}
if (!this.options.readOnly) select.selectMarked();
if (start)
this.scheduleHighlight();
return this.dirty.length == 0;
},
// Creates a function that, when called through a timeout, will
// continuously re-parse the document.
documentScanner: function(linesPer) {
var self = this, pos = null;
return function() {
// If the current node is no longer in the document... oh
// well, we start over.
if (pos && pos.parentNode != self.container)
pos = null;
select.markSelection(self.win);
var result = self.highlight(pos, linesPer, true);
select.selectMarked();
var newPos = result ? (result.node && result.node.nextSibling) : null;
pos = (pos == newPos) ? null : newPos;
self.delayScanning();
};
},
// Starts the continuous scanning process for this document after
// a given interval.
delayScanning: function() {
if (this.scanner) {
this.parent.clearTimeout(this.documentScan);
this.documentScan = this.parent.setTimeout(this.scanner, this.options.continuousScanning);
}
},
// The function that does the actual highlighting/colouring (with
// help from the parser and the DOM normalizer). Its interface is
// rather overcomplicated, because it is used in different
// situations: ensuring that a certain line is highlighted, or
// highlighting up to X lines starting from a certain point. The
// 'from' argument gives the node at which it should start. If
// this is null, it will start at the beginning of the document.
// When a number of lines is given with the 'target' argument, it
// will highlight no more than that amount of lines. If this
// argument holds a DOM node, it will highlight until it reaches
// that node. If at any time it comes across a 'clean' line (no
// dirty nodes), it will stop, except when 'cleanLines' is true.
highlight: function(from, target, cleanLines, maxBacktrack){
var container = this.container, self = this, active = this.options.activeTokens;
var lines = (typeof target == "number" ? target : null);
if (!container.firstChild)
return;
// Backtrack to the first node before from that has a partial
// parse stored.
while (from && (!from.parserFromHere || from.dirty)) {
from = from.previousSibling;
if (maxBacktrack != null && from.nodeName == "BR" && (--maxBacktrack) < 0)
return false;
}
// If we are at the end of the document, do nothing.
if (from && !from.nextSibling)
return;
// Check whether a part (<span> node) and the corresponding token
// match.
function correctPart(token, part){
return !part.reduced && part.currentText == token.value && part.className == token.style;
}
// Shorten the text associated with a part by chopping off
// characters from the front. Note that only the currentText
// property gets changed. For efficiency reasons, we leave the
// nodeValue alone -- we set the reduced flag to indicate that
// this part must be replaced.
function shortenPart(part, minus){
part.currentText = part.currentText.substring(minus);
part.reduced = true;
}
// Create a part corresponding to a given token.
function tokenPart(token){
var part = makePartSpan(token.value, self.doc);
part.className = token.style;
return part;
}
function maybeTouch(node) {
if (node) {
if (node.nextSibling != node.oldNextSibling) {
self.history.touch(node);
node.oldNextSibling = node.nextSibling;
}
}
else {
if (self.container.firstChild != self.container.oldFirstChild) {
self.history.touch(node);
self.container.oldFirstChild = self.container.firstChild;
}
}
}
// Get the token stream. If from is null, we start with a new
// parser from the start of the frame, otherwise a partial parse
// is resumed.
var traversal = traverseDOM(from ? from.nextSibling : container.firstChild),
stream = stringStream(traversal),
parsed = from ? from.parserFromHere(stream) : Editor.Parser.make(stream);
// parts is an interface to make it possible to 'delay' fetching
// the next DOM node until we are completely done with the one
// before it. This is necessary because often the next node is
// not yet available when we want to proceed past the current
// one.
var parts = {
current: null,
// Fetch current node.
get: function(){
if (!this.current)
this.current = traversal.nodes.shift();
return this.current;
},
// Advance to the next part (do not fetch it yet).
next: function(){
this.current = null;
},
// Remove the current part from the DOM tree, and move to the
// next.
remove: function(){
container.removeChild(this.get());
this.current = null;
},
// Advance to the next part that is not empty, discarding empty
// parts.
getNonEmpty: function(){
var part = this.get();
// Allow empty nodes when they are alone on a line, needed
// for the FF cursor bug workaround (see select.js,
// insertNewlineAtCursor).
while (part && part.nodeName == "SPAN" && part.currentText == "") {
var old = part;
this.remove();
part = this.get();
// Adjust selection information, if any. See select.js for details.
select.snapshotMove(old.firstChild, part && (part.firstChild || part), 0);
}
return part;
}
};
var lineDirty = false, prevLineDirty = true, lineNodes = 0;
// This forEach loops over the tokens from the parsed stream, and
// at the same time uses the parts object to proceed through the
// corresponding DOM nodes.
forEach(parsed, function(token){
var part = parts.getNonEmpty();
if (token.value == "\n"){
// The idea of the two streams actually staying synchronized
// is such a long shot that we explicitly check.
if (part.nodeName != "BR")
throw "Parser out of sync. Expected BR.";
if (part.dirty || !part.indentation) lineDirty = true;
maybeTouch(from);
from = part;
// Every <br> gets a copy of the parser state and a lexical
// context assigned to it. The first is used to be able to
// later resume parsing from this point, the second is used
// for indentation.
part.parserFromHere = parsed.copy();
part.indentation = token.indentation;
part.dirty = false;
// If the target argument wasn't an integer, go at least
// until that node.
if (lines == null && part == target) throw StopIteration;
// A clean line with more than one node means we are done.
// Throwing a StopIteration is the way to break out of a
// MochiKit forEach loop.
if ((lines != null && --lines <= 0) || (!lineDirty && !prevLineDirty && lineNodes > 1 && !cleanLines))
throw StopIteration;
prevLineDirty = lineDirty; lineDirty = false; lineNodes = 0;
parts.next();
}
else {
if (part.nodeName != "SPAN")
throw "Parser out of sync. Expected SPAN.";
if (part.dirty)
lineDirty = true;
lineNodes++;
// If the part matches the token, we can leave it alone.
if (correctPart(token, part)){
part.dirty = false;
parts.next();
}
// Otherwise, we have to fix it.
else {
lineDirty = true;
// Insert the correct part.
var newPart = tokenPart(token);
container.insertBefore(newPart, part);
if (active) active(newPart, token, self);
var tokensize = token.value.length;
var offset = 0;
// Eat up parts until the text for this token has been
// removed, adjusting the stored selection info (see
// select.js) in the process.
while (tokensize > 0) {
part = parts.get();
var partsize = part.currentText.length;
select.snapshotReplaceNode(part.firstChild, newPart.firstChild, tokensize, offset);
if (partsize > tokensize){
shortenPart(part, tokensize);
tokensize = 0;
}
else {
tokensize -= partsize;
offset += partsize;
parts.remove();
}
}
}
}
});
maybeTouch(from);
webkitLastLineHack(this.container);
// The function returns some status information that is used by
// hightlightDirty to determine whether and where it has to
// continue.
return {left: lines,
node: parts.getNonEmpty(),
dirty: lineDirty};
}
};
return Editor;
})();
addEventHandler(window, "load", function() {
var CodeMirror = window.frameElement.CodeMirror;
CodeMirror.editor = new Editor(CodeMirror.options);
this.parent.setTimeout(method(CodeMirror, "init"), 0);
});
</textarea>
</div>
<script type="text/javascript">
var textarea = document.getElementById('code');
var editor = new CodeMirror(CodeMirror.replace(textarea), {
height: "750px",
width: "100%",
content: textarea.value,
parserfile: ["tokenizejavascript.js", "parsejavascript.js"],
stylesheet: "css/jscolors.css",
path: "js/",
autoMatchParens: true,
initCallback: function(editor){editor.win.document.body.lastChild.scrollIntoView();}
});
</script>
</body>
</html>