CodeMirror

History

The first version of the editor was written early 2007, for the console in the Eloquent JavaScript website. The code was first packaged up and released under the name CodeMirror in May 2007. This version was based on the contentEditable feature of browsers.^[2]

In late 2010, the Ace project, another JavaScript-based code editor, pioneered new implementation techniques and demonstrated that it is possible, even in JavaScript, to handle documents with many thousands of lines without degraded performance. This prompted a rewrite of CodeMirror ^[3] along the same principles. The result was version 2, which no longer relied on contentEditable and significantly improved performance.

Features

• Multicursors
• Syntax highlighting
• Syntax verification
• Brace matching
• Auto indentation and outdent
• Autocompletion
• Code/text folding
• Search and Replace
• Handles huge documents (hundreds of thousands of lines) without trouble.
• Customizable key bindings including Vi and Emacs modes.
• A wide range of language modes.^[4]
• Add-ons for autocompletion, code folding, integrated linting.
• A broad programming API.
• Support for some mobile operating systems

Projects using CodeMirror

• Brackets (code editor)
• Codeanywhere
• Codenvy
• Gerrit Code Review
• Google Chrome DevTools
• Jupyter Notebook
• Light Table (experimental IDE)
• Mozilla Firefox web console
• uBlock Origin
• SWISH (Web-based Prolog IDE)

See also

• Comparison of JavaScript-based source code editors

References

External links

• Official website
• Blog series about CodeMirror internals

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