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authorAdam Mathes <adam@adammathes.com>2026-02-14 14:46:37 -0800
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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