media query list parser

.github/workflows/test.yml

@@ -81,7 +81,7 @@ jobs:
         # - without requiring postinstall scripts from dependencies to run
       - name: build
         run: |
-          npm run build --if-present $MODIFIED_WORKSPACES
+          npm run build --if-present
 
       - name: lint
         run: npm run lint --if-present $MODIFIED_WORKSPACES

package.json

@@ -9,6 +9,9 @@
 		"node": "^14 || ^16 || >=18"
 	},
 	"workspaces": [
+		"packages/css-tokenizer",
+		"packages/css-parser-algorithms",
+		"packages/media-query-list-parser",
 		"packages/*",
 		"plugins/postcss-progressive-custom-properties",
 		"plugins/*",

packages/css-parser-algorithms/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+package-lock.json
+yarn.lock
+*.result.css
+*.result.css.map
+*.result.json
+dist/*

packages/css-parser-algorithms/.nvmrc

@@ -0,0 +1 @@
+v16.13.1

packages/css-parser-algorithms/CHANGELOG.md

@@ -0,0 +1,3 @@
+### 1.0.0
+
+- Initial version

packages/css-parser-algorithms/LICENSE.md

@@ -0,0 +1,20 @@
+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.

packages/css-parser-algorithms/README.md

@@ -0,0 +1,120 @@
+# CSS Parser Algorithms
+
+[<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/workflows/test/badge.svg" 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/
+
+## Usage
+
+Add [CSS Parser Algorithms] to your project:
+
+```bash
+npm install postcss @csstools/css-parser-algorithms --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 new Error(JSON.stringify(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.
+
+```css
+import { parseComponentValue } from '@csstools/css-parser-algorithms';
+
+const result = parseComponentValue(tokens, options);
+const ancestry = gatherNodeAncestry(result);
+```
+
+### Options
+
+```ts
+{
+	onParseError?: (error: ParserError) => 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.
+
+`start` and `end` are the location in your CSS source code.
+
+`UnclosedSimpleBlockNode` and `UnclosedFunctionNode` entries will be added to the output.
+This allows you to recover from errors and/or show warnings.
+
+## 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