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CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. If a parser has been written for the language you are editing (see below for a list of supported languages), the code will be coloured, and the editor will help you with indentation.
To get a look at CodeMirror, see the test pages for the various parsers...
Or take a look at some real-world uses of the system...
30-05-2009: Version
0.62: Introduces Python
and Lua parsers. Add
setParser (on-the-fly mode changing) and
clearHistory methods. Make parsing passes time-based
instead of lines-based (see the passTime option).
04-03-2009: Version
0.61: Add line numbers support (see lineNumbers
option in manual). Support a mode where tab
'shifts' indentation instead of resetting it (see
tabMode="shift"). Add indentUnit option to
configure indentation depths. Make it possible to grab the editor's
keyboard input, which is useful when popping up dialogs (see
grabKeys/ungrabKeys). Fix a lot of small
bugs, among which the various issues related to pasting in Internet
Explorer.
29-12-2008: Version
0.60: This release makes lots of internal changes, so test before
you upgrade. More robust selection-preservation on IE, allowing styles
with different font sizes. New activeTokens and
cursorActivity callbacks, and a more powerful, line-based
interface for inspecting and manipulating the content of the editor
(see manual). Fixes the
replaceSelection problem in IE, and a lot of other,
smaller issues.
28-09-2008: Version
0.58: Add parsers for SPARQL and HTML-mixed-mode (nests CSS and JS
parsers). Also: bracket highlighting, a 'dumb tabs' mode, an
onChange callback, and heaps of bugfixes. See the manual
for details on the new features.
04-07-2008: Version 0.57: A CSS parser and a nice tokenizer framework, bugfixes in the XML parser, a few browser-issue workarounds, one of which should fix the age-old Firefox cursor-showing-on-wrong line bug.
At this time, the following browsers are supported:
Making it work on other browsers that have decent support for the W3C DOM model should not be too hard, but I am not actively testing against those.
All of CodeMirror is released under a zlib-style license. To get it, you can download the latest release or the current development snapshot as zip files, or use the darcs version control system to get the repository:
darcs get http://marijn.haverbeke.nl/codemirror
This second method is recommended if you are planning to hack on CodeMirror ― it makes it easy to record your patches and share them with me. To see the repository online, visit the CodeMirror darcsweb.
There is a Google group (a sort of mailing list/newsgroup thingy) for discussion and news related to CodeMirror. You can also e-mail me directly: Marijn Haverbeke.