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# Changes to CSS Parser Algorithms
### 3.0.5
_May 27, 2025_
- Updated [`@csstools/css-tokenizer`](https://github.com/csstools/postcss-plugins/tree/main/packages/css-tokenizer) to [`3.0.4`](https://github.com/csstools/postcss-plugins/tree/main/packages/css-tokenizer/CHANGELOG.md#304) (patch)
[Full CHANGELOG](https://github.com/csstools/postcss-plugins/tree/main/packages/css-parser-algorithms/CHANGELOG.md)

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The MIT License (MIT)
Copyright 2022 Romain Menke, Antonio Laguna <antonio@laguna.es>
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# CSS Parser Algorithms <img src="https://cssdb.org/images/css.svg" alt="for CSS" width="90" height="90" align="right">
[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/css-parser-algorithms.svg" height="20">][npm-url]
[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/actions/workflows/test.yml/badge.svg?branch=main" height="20">][cli-url]
[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
Implemented from : https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/
## API
[Read the API docs](./docs/css-parser-algorithms.md)
## Usage
Add [CSS Parser Algorithms] to your project:
```bash
npm install @csstools/css-parser-algorithms @csstools/css-tokenizer --save-dev
```
[CSS Parser Algorithms] only accepts tokenized CSS.
It must be used together with `@csstools/css-tokenizer`.
```js
import { tokenizer, TokenType } from '@csstools/css-tokenizer';
import { parseComponentValue } from '@csstools/css-parser-algorithms';
const myCSS = `@media only screen and (min-width: 768rem) {
.foo {
content: 'Some content!' !important;
}
}
`;
const t = tokenizer({
css: myCSS,
});
const tokens = [];
{
while (!t.endOfFile()) {
tokens.push(t.nextToken());
}
tokens.push(t.nextToken()); // EOF-token
}
const options = {
onParseError: ((err) => {
throw err;
}),
};
const result = parseComponentValue(tokens, options);
console.log(result);
```
### Available functions
- [`parseComponentValue`](https://www.w3.org/TR/css-syntax-3/#parse-component-value)
- [`parseListOfComponentValues`](https://www.w3.org/TR/css-syntax-3/#parse-list-of-component-values)
- [`parseCommaSeparatedListOfComponentValues`](https://www.w3.org/TR/css-syntax-3/#parse-comma-separated-list-of-component-values)
### Utilities
#### `gatherNodeAncestry`
The AST does not expose the entire ancestry of each node.
The walker methods do provide access to the current parent, but also not the entire ancestry.
To gather the entire ancestry for a a given sub tree of the AST you can use `gatherNodeAncestry`.
The result is a `Map` with the child nodes as keys and the parents as values.
This allows you to lookup any ancestor of any node.
```js
import { parseComponentValue } from '@csstools/css-parser-algorithms';
const result = parseComponentValue(tokens, options);
const ancestry = gatherNodeAncestry(result);
```
### Options
```ts
{
onParseError?: (error: ParseError) => void
}
```
#### `onParseError`
The parser algorithms are forgiving and won't stop when a parse error is encountered.
Parse errors also aren't tokens.
To receive parsing error information you can set a callback.
Parser errors will try to inform you about the point in the parsing logic the error happened.
This tells you the kind of error.
## Goals and non-goals
Things this package aims to be:
- specification compliant CSS parser
- a reliable low level package to be used in CSS sub-grammars
What it is not:
- opinionated
- fast
- small
- a replacement for PostCSS (PostCSS is fast and also an ecosystem)
[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
[discord]: https://discord.gg/bUadyRwkJS
[npm-url]: https://www.npmjs.com/package/@csstools/css-parser-algorithms
[CSS Parser Algorithms]: https://github.com/csstools/postcss-plugins/tree/main/packages/css-parser-algorithms

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{
"name": "@csstools/css-parser-algorithms",
"description": "Algorithms to help you parse CSS from an array of tokens.",
"version": "3.0.5",
"contributors": [
{
"name": "Antonio Laguna",
"email": "antonio@laguna.es",
"url": "https://antonio.laguna.es"
},
{
"name": "Romain Menke",
"email": "romainmenke@gmail.com"
}
],
"license": "MIT",
"funding": [
{
"type": "github",
"url": "https://github.com/sponsors/csstools"
},
{
"type": "opencollective",
"url": "https://opencollective.com/csstools"
}
],
"engines": {
"node": ">=18"
},
"type": "module",
"main": "dist/index.cjs",
"module": "dist/index.mjs",
"exports": {
".": {
"import": {
"types": "./dist/index.d.ts",
"default": "./dist/index.mjs"
},
"require": {
"default": "./dist/index.cjs"
}
}
},
"files": [
"CHANGELOG.md",
"LICENSE.md",
"README.md",
"dist"
],
"peerDependencies": {
"@csstools/css-tokenizer": "^3.0.4"
},
"scripts": {},
"homepage": "https://github.com/csstools/postcss-plugins/tree/main/packages/css-parser-algorithms#readme",
"repository": {
"type": "git",
"url": "git+https://github.com/csstools/postcss-plugins.git",
"directory": "packages/css-parser-algorithms"
},
"bugs": "https://github.com/csstools/postcss-plugins/issues",
"keywords": [
"css",
"parser"
]
}