rainbowBrackets: a codeMirror Extension

---

This is a working attempt at a rainbowBracket extension for CodeMirror6.

What are rainbow brackets?

Great question! Rainbow Brackets are brackets, curly braces, or parentheses that change color with scope/depth. See intelliJ's Rainbow Bracket Extension.

Demo

Live Implementation:

CodePen GPT

Table of Contents

• rainbowBrackets: a codeMirror Extension
  • What are rainbow brackets?
• Demo
• Features
• Usage/Examples
  • @uiw/react-codemirror
  • codemirror package
  • vanilla javascript
• API Reference
• Deployment
• Roadmap
• FAQ
  • Does this work for controlled and uncontroleld CodeMirror Components?
  • Can I change the colors?
• Contributing
• License
• Related
• Closing

Features

• Depth/Scope detection
• 7 customizable bracket classes
• Default colors: Red Orange Yellow Green Blue Indigo Violet
• Implementation agnostic
• Theme agnostic

Usage/Examples

Depending on your theme and extensions, the rainbowBrackets may not apply correctly as the span structure looks something like this, where the color of the inner span will override the rainbow-bracket. Investigate with Chrome Dev Tools if you're encountering a bug.

Nearly Fixed as of 2.0.0. See updated API Reference.

<span class="rainbow-bracket-orange">
  <span class="ͼ5k">{</span> //opening bracket displaying theme color
</span>

To work around this, we can add the following CSS.

.rainbow-bracket-red > span {
  color: red;
}

.rainbow-bracket-orange > span {
  color: orange;
}

.rainbow-bracket-yellow > span {
  color: yellow;
}

.rainbow-bracket-green > span {
  color: green;
}

.rainbow-bracket-blue > span {
  color: blue;
}

.rainbow-bracket-indigo > span {
  color: indigo;
}

.rainbow-bracket-violet > span {
  color: violet;
}

This will override the inner span. Future implementations should ensure the rainbowBracket has higher precedence.

@uiw/react-codemirror

import rainbowBrackets from 'rainbowbrackets'

const cmExtensions = [/*Your Other Extensions */, rainbowBrackets()]

//...

<CodeMirror
  //other props
  extensions={cmExtensions}
>

codemirror package

coming soon...handle as you would an existing extension

vanilla javascript

coming soon...handle as you would an existing extension

API Reference

Class Structure

1.0.1

.rainbow-bracket-red {color: 'red'}
.rainbow-bracket-orange {color: 'orange'}
.rainbow-bracket-yellow {color: 'yellow'}
.rainbow-bracket-green {color: 'green'}
.rainbow-bracket-blue {color: 'blue'}
.rainbow-bracket-indigo {color: 'indigo'}
.rainbow-bracket-violet {color: 'violet'}

2.0.0

.rainbow-bracket-red: { color: 'red' }
.rainbow-bracket-red > span: { color: 'red' }
.rainbow-bracket-orange: { color: 'orange' }
.rainbow-bracket-orange > span: { color: 'orange' }
.rainbow-bracket-yellow: { color: 'yellow' }
.rainbow-bracket-yellow > span: { color: 'yellow' }
.rainbow-bracket-green: { color: 'green' }
.rainbow-bracket-green > span: { color: 'green' }
.rainbow-bracket-blue: { color: 'blue' }
.rainbow-bracket-blue > span: { color: 'blue' }
.rainbow-bracket-indigo: { color: 'indigo' }
.rainbow-bracket-indigo > span: { color: 'indigo' }
.rainbow-bracket-violet: { color: 'violet' }
.rainbow-bracket-violet > span: { color: 'violet' }

Development

git fork, clone, then navigate into this repository.

Install dependencies:

  npm install

See Contributing. TLDR: Make a branch with your feature name/bug fix, include detailed commit log and PR message.

Roadmap

• More testing across a wide range of functions, scopes, languages, etc

FAQ

Does this work for controlled and uncontroleld CodeMirror Components?

Yes! Although it's likely there are unknown bugs I have yet to encounter.

Can I change the colors?

Yes! See the API reference above. If you want to change red to pink, simply use a little CSS:

.rainbow-bracket-red {
    color: pink;
}
/* Override may be neccessary as well*/
.rainbow-bracket-red > span {
    color: pink;
}

I'll rename these classes if enough people want color flexibility to something more intuitive.

Contributing

See contributing.md to get started.

Please adhere to this project's code of conduct.

License

MIT

Related

CodeMirror HomePage

CodeMirror Extensions

CodeMirror Extensions Forum Discussion

CodeMirror-React

IntelliJ RainbowBrackets

Closing

This extension is still experimental and it may not perfectly colorize scope. It still may be useful, or at least fun to use. Improvements are welcome. Big thank you to Marijn Haverbeke, the CodeMirror community, and all its contributors.