150 lines
5.0 KiB
Markdown
150 lines
5.0 KiB
Markdown
# [postcss][postcss]-reduce-idents [][ci] [][npm] [][deps]
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> Reduce [custom identifiers][idents] with PostCSS.
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## Install
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With [npm](https://npmjs.org/package/postcss-reduce-idents) do:
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```
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npm install postcss-reduce-idents --save
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```
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## Example
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### Input
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This module will rename custom identifiers in your CSS files; it does so by
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converting each name to a index, which is then encoded into a legal identifier.
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A legal custom identifier in CSS is case sensitive and must start with a
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letter, but can contain digits, hyphens and underscores. There are over 3,000
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possible two character identifiers, and 51 possible single character identifiers
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that will be generated.
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```css
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@keyframes whiteToBlack {
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0% {
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color: #fff
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}
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to {
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color: #000
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}
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}
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.one {
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animation-name: whiteToBlack
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}
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```
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### Output
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```css
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@keyframes a {
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0% {
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color: #fff
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}
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to {
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color: #000
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}
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}
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.one {
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animation-name: a
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}
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```
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Note that this module does not handle identifiers that are not linked together.
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The following example will not be transformed in any way:
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```css
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@keyframes fadeOut {
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0% { opacity: 1 }
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to { opacity: 0 }
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}
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.fadeIn {
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animation-name: fadeIn;
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}
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```
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It works for `@keyframes`, `@counter-style`, custom `counter` values and grid area definitions. See the
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[documentation][idents] for more information, or the [tests](test.js) for more
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examples.
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## Usage
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See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
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examples for your environment.
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## API
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### reduceIdents([options])
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#### options
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##### counter
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Type: `boolean`
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Default: `true`
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Pass `false` to disable reducing `content`, `counter-reset` and `counter-increment` declarations.
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##### keyframes
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Type: `boolean`
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Default: `true`
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Pass `false` to disable reducing `keyframes` rules and `animation` declarations.
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##### counterStyle
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Type: `boolean`
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Default: `true`
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Pass `false` to disable reducing `counter-style` rules and `list-style` and `system` declarations.
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##### gridTemplate
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Type: `boolean`
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Default: `true`
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Pass `false` to disable reducing `grid-template`, `grid-area` and `grid-template-areas` declarations.
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##### encoder
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Type: `function`
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Default: [`lib/encode.js`](https://github.com/ben-eb/postcss-reduce-idents/blob/master/src/lib/encode.js)
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Pass a custom function to encode the identifier with (e.g.: as a way of prefixing them automatically).
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It receives two parameters:
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- A `String` with the node value.
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- A `Number` identifying the index of the occurrence.
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## Contributors
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Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):
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<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
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| [<img src="https://avatars.githubusercontent.com/u/1282980?v=3" width="100px;"/><br /><sub>Ben Briggs</sub>](http://beneb.info)<br />[💻](https://github.com/ben-eb/postcss-reduce-idents/commits?author=ben-eb) [📖](https://github.com/ben-eb/postcss-reduce-idents/commits?author=ben-eb) 👀 [⚠️](https://github.com/ben-eb/postcss-reduce-idents/commits?author=ben-eb) | [<img src="https://avatars.githubusercontent.com/u/5635476?v=3" width="100px;"/><br /><sub>Bogdan Chadkin</sub>](https://github.com/TrySound)<br />[⚠️](https://github.com/ben-eb/postcss-reduce-idents/commits?author=TrySound) [💻](https://github.com/ben-eb/postcss-reduce-idents/commits?author=TrySound) | [<img src="https://avatars.githubusercontent.com/u/13041?v=3" width="100px;"/><br /><sub>Guillermo Rauch</sub>](http://twitter.com/rauchg)<br />[💻](https://github.com/ben-eb/postcss-reduce-idents/commits?author=rauchg) [📖](https://github.com/ben-eb/postcss-reduce-idents/commits?author=rauchg) [⚠️](https://github.com/ben-eb/postcss-reduce-idents/commits?author=rauchg) | [<img src="https://avatars.githubusercontent.com/u/566536?v=3" width="100px;"/><br /><sub>Sylvain Pollet-Villard</sub>](https://github.com/sylvainpolletvillard)<br />[💻](https://github.com/ben-eb/postcss-reduce-idents/commits?author=sylvainpolletvillard) [📖](https://github.com/ben-eb/postcss-reduce-idents/commits?author=sylvainpolletvillard) [⚠️](https://github.com/ben-eb/postcss-reduce-idents/commits?author=sylvainpolletvillard) |
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<!-- ALL-CONTRIBUTORS-LIST:END -->
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This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!
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## License
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MIT © [Ben Briggs](http://beneb.info)
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[ci]: https://travis-ci.org/ben-eb/postcss-reduce-idents
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[deps]: https://gemnasium.com/ben-eb/postcss-reduce-idents
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[idents]: https://developer.mozilla.org/en-US/docs/Web/CSS/custom-ident
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[npm]: http://badge.fury.io/js/postcss-reduce-idents
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[postcss]: https://github.com/postcss/postcss
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