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https://github.com/niksy/postcss-query-ast
Query PostCSS AST with CSS selectors.
https://github.com/niksy/postcss-query-ast
Last synced: 18 days ago
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Query PostCSS AST with CSS selectors.
- Host: GitHub
- URL: https://github.com/niksy/postcss-query-ast
- Owner: niksy
- License: mit
- Created: 2019-01-03T14:58:58.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2023-08-23T07:29:58.000Z (about 1 year ago)
- Last Synced: 2024-04-25T12:22:09.825Z (7 months ago)
- Language: JavaScript
- Size: 35.2 KB
- Stars: 11
- Watchers: 3
- Forks: 1
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.md
Awesome Lists containing this project
README
# postcss-query-ast
[![Build Status][ci-img]][ci]
Query PostCSS AST with CSS selectors.
Supported selectors are:
- [Type selectors][mdn-type-selector]: `rule`, `atrule`, `decl`, `comment`
- [Universal selector](mdn-universal-selector): `*`
- [Attribute selectors][mdn-attribute-selector]: `[attr=value]`,
`[attr=value]`, `[attr~=value]`, `[attr|=value]`, `[attr^=value]`,
`[attr$=value]`, `[attr*=value]`
- [Descendant combinator][mdn-descendant-combinator]: `rule decl`
- [Child combinator][mdn-child-combinator]: `atrule > rule`
- [Adjacent sibling combinator][mdn-adjacent-sibling-combinator]:
`rule + rule`
- [General sibling combinator][mdn-general-sibling-combinator]: `rule ~ rule`
- Child pseudo classes ([`:first-child`][mdn-first-child],
[`:last-child`][mdn-last-child], [`:nth-child`][mdn-nth-child],
[`:nth-last-child`][mdn-nth-last-child], [`:only-child`][mdn-only-child]):
`rule:first-child`
- Type pseudo classes ([`:first-of-type`][mdn-first-of-type],
[`:last-of-type`][mdn-last-of-type], [`:nth-of-type`][mdn-nth-of-type],
[`:nth-last-of-type`][mdn-nth-last-of-type],
[`:only-of-type`][mdn-only-of-type]): `rule:first-of-type`
- [Empty nodes][mdn-empty]: `rule:empty`
- [Matches][mdn-matches]: `:matches(rule, atrule)`
- [Negation][mdn-not]: `:not(atrule)`
In addition to standard selectors, there are also custom selectors:
- Attribute selector with regular expression: `[attr="/^value$/i"]`
## Install
```sh
npm install postcss-query-ast --save
```
## Usage
Querying AST from following CSS will give us only `body` rule with `jackie` ID
attribute.
```css
body {
background: red;
}
body#jackie {
background: hotpink;
}
a {
background: green;
}
```
```js
import queryAst from 'postcss-query-ast';
// Assume we have AST
const postcssAst = [];
(async () => {
const ast = await queryAst('rule[selector="body#jackie"]', postcssAst);
/* [ Rule {
raws: { before: '\n\n', between: ' ', semicolon: true, after: '\n' },
type: 'rule',
nodes: [ [Declaration] ],
parent:
Root {
raws: [Object],
type: 'root',
nodes: [Array],
source: [Object],
lastEach: 1,
indexes: {} },
source: { start: [Object], input: [Input], end: [Object] },
selector: 'body#jackie',
lastEach: 1,
indexes: {} } ] */
})();
```
## API
### queryAst(query, ast)
Returns: `Promise<(Root | Rule | AtRule | Declaration | Comment)[]>`
Queries PostCSS with CSS selector.
#### query
Type: `string`
CSS selector.
#### ast
Type: `Root`
PostCSS AST.
## License
MIT © [Ivan Nikolić](http://ivannikolic.com)
[ci]: https://github.com/niksy/postcss-query-ast/actions?query=workflow%3ACI
[ci-img]: https://github.com/niksy/postcss-query-ast/workflows/CI/badge.svg?branch=master
[mdn-type-selector]: https://developer.mozilla.org/en-US/docs/Web/CSS/Type_selectors
[mdn-universal-selector]: https://developer.mozilla.org/en-US/docs/Web/CSS/Universal_selectors
[mdn-attribute-selector]: https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors
[mdn-descendant-combinator]: https://developer.mozilla.org/en-US/docs/Web/CSS/Descendant_selectors
[mdn-child-combinator]: https://developer.mozilla.org/en-US/docs/Web/CSS/Child_selectors
[mdn-adjacent-sibling-combinator]: https://developer.mozilla.org/en-US/docs/Web/CSS/Adjacent_sibling_selectors
[mdn-general-sibling-combinator]: https://developer.mozilla.org/en-US/docs/Web/CSS/General_sibling_selectors
[mdn-first-child]: https://developer.mozilla.org/en-US/docs/Web/CSS/:first-child
[mdn-last-child]: https://developer.mozilla.org/en-US/docs/Web/CSS/:last-child
[mdn-nth-child]: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-child
[mdn-nth-last-child]: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-child
[mdn-only-child]: https://developer.mozilla.org/en-US/docs/Web/CSS/:only-child
[mdn-first-of-type]: https://developer.mozilla.org/en-US/docs/Web/CSS/:first-of-type
[mdn-last-of-type]: https://developer.mozilla.org/en-US/docs/Web/CSS/:last-of-type
[mdn-nth-of-type]: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-of-type
[mdn-nth-last-of-type]: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-of-type
[mdn-only-of-type]: https://developer.mozilla.org/en-US/docs/Web/CSS/:only-of-type
[mdn-empty]: https://developer.mozilla.org/en-US/docs/Web/CSS/:empty
[mdn-matches]: https://developer.mozilla.org/en-US/docs/Web/CSS/:matches
[mdn-not]: https://developer.mozilla.org/en-US/docs/Web/CSS/:not