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315 lines
7.7 KiB
315 lines
7.7 KiB
# css [](https://travis-ci.org/reworkcss/css)
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CSS parser / stringifier.
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## Installation
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$ npm install css
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## Usage
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```js
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var css = require('css');
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var obj = css.parse('body { font-size: 12px; }', options);
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css.stringify(obj, options);
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```
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## API
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### css.parse(code, [options])
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Accepts a CSS string and returns an AST `object`.
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`options`:
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- silent: silently fail on parse errors.
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- source: the path to the file containing `css`. Makes errors and source
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maps more helpful, by letting them know where code comes from.
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### css.stringify(object, [options])
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Accepts an AST `object` (as `css.parse` produces) and returns a CSS string.
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`options`:
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- indent: the string used to indent the output. Defaults to two spaces.
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- compress: omit comments and extraneous whitespace.
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- sourcemap: return a sourcemap along with the CSS output. Using the `source`
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option of `css.parse` is strongly recommended when creating a source map.
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Specify `sourcemap: 'generator'` to return the SourceMapGenerator object
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instead of serializing the source map.
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- inputSourcemaps: (enabled by default, specify `false` to disable) reads any
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source maps referenced by the input files when generating the output source
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map. When enabled, file system access may be required for reading the
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referenced source maps.
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### Example
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```js
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var ast = css.parse('body { font-size: 12px; }', { source: 'source.css' });
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var css = css.stringify(ast);
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var result = css.stringify(ast, { sourcemap: true });
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result.code // string with CSS
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result.map // source map object
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```
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### Errors
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Errors thrown during parsing have the following properties:
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- message: `String`. The full error message with the source position.
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- reason: `String`. The error message without position.
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- filename: `String` or `undefined`. The value of `options.source` if
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passed to `css.parse`. Otherwise `undefined`.
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- line: `Integer`.
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- column: `Integer`.
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- source: `String`. The portion of code that couldn't be parsed.
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When parsing with the `silent` option, errors are listed in the
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`parsingErrors` property of the [`stylesheet`](#stylesheet) node instead
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of being thrown.
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If you create any errors in plugins such as in
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[rework](https://github.com/reworkcss/rework), you __must__ set the same
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properties for consistency.
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## AST
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Interactively explore the AST with <http://iamdustan.com/reworkcss_ast_explorer/>.
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### Common properties
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All nodes have the following properties.
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#### position
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Information about the position in the source string that corresponds to
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the node.
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`Object`:
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- start: `Object`:
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- line: `Number`.
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- column: `Number`.
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- end: `Object`:
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- line: `Number`.
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- column: `Number`.
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- source: `String` or `undefined`. The value of `options.source` if passed to
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`css.parse`. Otherwise `undefined`.
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- content: `String`. The full source string passed to `css.parse`.
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The line and column numbers are 1-based: The first line is 1 and the first
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column of a line is 1 (not 0).
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The `position` property lets you know from which source file the node comes
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from (if available), what that file contains, and what part of that file was
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parsed into the node.
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#### type
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`String`. The possible values are the ones listed in the Types section below.
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#### parent
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A reference to the parent node, or `null` if the node has no parent.
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### Types
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The available values of `node.type` are listed below, as well as the available
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properties of each node (other than the common properties listed above.)
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#### stylesheet
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The root node returned by `css.parse`.
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- stylesheet: `Object`:
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- rules: `Array` of nodes with the types `rule`, `comment` and any of the
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at-rule types.
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- parsingErrors: `Array` of `Error`s. Errors collected during parsing when
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option `silent` is true.
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#### rule
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- selectors: `Array` of `String`s. The list of selectors of the rule, split
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on commas. Each selector is trimmed from whitespace and comments.
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- declarations: `Array` of nodes with the types `declaration` and `comment`.
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#### declaration
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- property: `String`. The property name, trimmed from whitespace and
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comments. May not be empty.
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- value: `String`. The value of the property, trimmed from whitespace and
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comments. Empty values are allowed.
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#### comment
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A rule-level or declaration-level comment. Comments inside selectors,
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properties and values etc. are lost.
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- comment: `String`. The part between the starting `/*` and the ending `*/`
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of the comment, including whitespace.
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#### charset
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The `@charset` at-rule.
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- charset: `String`. The part following `@charset `.
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#### custom-media
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The `@custom-media` at-rule.
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- name: `String`. The `--`-prefixed name.
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- media: `String`. The part following the name.
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#### document
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The `@document` at-rule.
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- document: `String`. The part following `@document `.
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- vendor: `String` or `undefined`. The vendor prefix in `@document`, or
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`undefined` if there is none.
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- rules: `Array` of nodes with the types `rule`, `comment` and any of the
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at-rule types.
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#### font-face
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The `@font-face` at-rule.
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- declarations: `Array` of nodes with the types `declaration` and `comment`.
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#### host
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The `@host` at-rule.
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- rules: `Array` of nodes with the types `rule`, `comment` and any of the
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at-rule types.
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#### import
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The `@import` at-rule.
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- import: `String`. The part following `@import `.
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#### keyframes
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The `@keyframes` at-rule.
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- name: `String`. The name of the keyframes rule.
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- vendor: `String` or `undefined`. The vendor prefix in `@keyframes`, or
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`undefined` if there is none.
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- keyframes: `Array` of nodes with the types `keyframe` and `comment`.
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#### keyframe
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- values: `Array` of `String`s. The list of “selectors” of the keyframe rule,
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split on commas. Each “selector” is trimmed from whitespace.
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- declarations: `Array` of nodes with the types `declaration` and `comment`.
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#### media
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The `@media` at-rule.
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- media: `String`. The part following `@media `.
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- rules: `Array` of nodes with the types `rule`, `comment` and any of the
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at-rule types.
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#### namespace
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The `@namespace` at-rule.
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- namespace: `String`. The part following `@namespace `.
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#### page
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The `@page` at-rule.
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- selectors: `Array` of `String`s. The list of selectors of the rule, split
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on commas. Each selector is trimmed from whitespace and comments.
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- declarations: `Array` of nodes with the types `declaration` and `comment`.
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#### supports
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The `@supports` at-rule.
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- supports: `String`. The part following `@supports `.
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- rules: `Array` of nodes with the types `rule`, `comment` and any of the
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at-rule types.
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### Example
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CSS:
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```css
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body {
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background: #eee;
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color: #888;
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}
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```
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Parse tree:
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```json
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{
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"type": "stylesheet",
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"stylesheet": {
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"rules": [
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{
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"type": "rule",
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"selectors": [
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"body"
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],
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"declarations": [
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{
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"type": "declaration",
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"property": "background",
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"value": "#eee",
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"position": {
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"start": {
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"line": 2,
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"column": 3
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},
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"end": {
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"line": 2,
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"column": 19
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}
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}
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},
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{
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"type": "declaration",
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"property": "color",
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"value": "#888",
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"position": {
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"start": {
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"line": 3,
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"column": 3
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},
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"end": {
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"line": 3,
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"column": 14
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}
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}
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}
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],
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"position": {
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"start": {
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"line": 1,
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"column": 1
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},
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"end": {
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"line": 4,
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"column": 2
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}
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}
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}
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]
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}
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}
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```
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## License
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MIT
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