aacb45156b
- Install Jest for unit testing with React Testing Library - Install Playwright for end-to-end testing - Configure Jest with proper TypeScript support and module mapping - Create test setup files and utilities for both unit and e2e tests Components: * Jest configuration with coverage thresholds * Playwright configuration with browser automation * Unit tests for LoginForm, AuthContext, and useSocketIO hook * E2E tests for authentication, dashboard, and agents workflows * GitHub Actions workflow for automated testing * Mock data and API utilities for consistent testing * Test documentation with best practices Testing features: - Unit tests with 70% coverage threshold - E2E tests with API mocking and user journey testing - CI/CD integration for automated test runs - Cross-browser testing support with Playwright - Authentication system testing end-to-end 🚀 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
120 lines
3.3 KiB
Markdown
120 lines
3.3 KiB
Markdown
# CSS Parser Algorithms <img src="https://cssdb.org/images/css.svg" alt="for CSS" width="90" height="90" align="right">
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[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/css-parser-algorithms.svg" height="20">][npm-url]
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[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/actions/workflows/test.yml/badge.svg?branch=main" height="20">][cli-url]
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[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
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Implemented from : https://www.w3.org/TR/2021/CRD-css-syntax-3-20211224/
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## API
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[Read the API docs](./docs/css-parser-algorithms.md)
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## Usage
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Add [CSS Parser Algorithms] to your project:
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```bash
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npm install @csstools/css-parser-algorithms @csstools/css-tokenizer --save-dev
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```
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[CSS Parser Algorithms] only accepts tokenized CSS.
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It must be used together with `@csstools/css-tokenizer`.
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```js
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import { tokenizer, TokenType } from '@csstools/css-tokenizer';
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import { parseComponentValue } from '@csstools/css-parser-algorithms';
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const myCSS = `@media only screen and (min-width: 768rem) {
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.foo {
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content: 'Some content!' !important;
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}
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}
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`;
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const t = tokenizer({
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css: myCSS,
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});
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const tokens = [];
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{
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while (!t.endOfFile()) {
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tokens.push(t.nextToken());
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}
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tokens.push(t.nextToken()); // EOF-token
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}
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const options = {
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onParseError: ((err) => {
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throw err;
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}),
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};
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const result = parseComponentValue(tokens, options);
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console.log(result);
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```
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### Available functions
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- [`parseComponentValue`](https://www.w3.org/TR/css-syntax-3/#parse-component-value)
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- [`parseListOfComponentValues`](https://www.w3.org/TR/css-syntax-3/#parse-list-of-component-values)
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- [`parseCommaSeparatedListOfComponentValues`](https://www.w3.org/TR/css-syntax-3/#parse-comma-separated-list-of-component-values)
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### Utilities
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#### `gatherNodeAncestry`
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The AST does not expose the entire ancestry of each node.
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The walker methods do provide access to the current parent, but also not the entire ancestry.
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To gather the entire ancestry for a a given sub tree of the AST you can use `gatherNodeAncestry`.
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The result is a `Map` with the child nodes as keys and the parents as values.
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This allows you to lookup any ancestor of any node.
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```js
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import { parseComponentValue } from '@csstools/css-parser-algorithms';
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const result = parseComponentValue(tokens, options);
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const ancestry = gatherNodeAncestry(result);
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```
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### Options
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```ts
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{
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onParseError?: (error: ParseError) => void
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}
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```
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#### `onParseError`
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The parser algorithms are forgiving and won't stop when a parse error is encountered.
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Parse errors also aren't tokens.
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To receive parsing error information you can set a callback.
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Parser errors will try to inform you about the point in the parsing logic the error happened.
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This tells you the kind of error.
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## Goals and non-goals
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Things this package aims to be:
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- specification compliant CSS parser
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- a reliable low level package to be used in CSS sub-grammars
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What it is not:
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- opinionated
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- fast
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- small
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- a replacement for PostCSS (PostCSS is fast and also an ecosystem)
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[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
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[discord]: https://discord.gg/bUadyRwkJS
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[npm-url]: https://www.npmjs.com/package/@csstools/css-parser-algorithms
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[CSS Parser Algorithms]: https://github.com/csstools/postcss-plugins/tree/main/packages/css-parser-algorithms
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