npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@smithc/css

v3.0.0

Published

CSS parser / stringifier

Downloads

1,528

Readme

css Build Status

CSS parser / stringifier.

Installation

$ npm install css

Usage

var css = require('css');
var obj = css.parse('body { font-size: 12px; }', options);
css.stringify(obj, options);

API

css.parse(code, [options])

Accepts a CSS string and returns an AST object.

options:

  • silent: silently fail on parse errors.
  • source: the path to the file containing css. Makes errors and source maps more helpful, by letting them know where code comes from.

css.stringify(object, [options])

Accepts an AST object (as css.parse produces) and returns a CSS string.

options:

  • indent: the string used to indent the output. Defaults to two spaces.
  • compress: omit comments and extraneous whitespace.
  • sourcemap: return a sourcemap along with the CSS output. Using the source option of css.parse is strongly recommended when creating a source map. Specify sourcemap: 'generator' to return the SourceMapGenerator object instead of serializing the source map.
  • inputSourcemaps: (enabled by default, specify false to disable) reads any source maps referenced by the input files when generating the output source map. When enabled, file system access may be required for reading the referenced source maps.

Example

var ast = css.parse('body { font-size: 12px; }', { source: 'source.css' });

var css = css.stringify(ast);

var result = css.stringify(ast, { sourcemap: true });
result.code // string with CSS
result.map // source map object

Errors

Errors thrown during parsing have the following properties:

  • message: String. The full error message with the source position.
  • reason: String. The error message without position.
  • filename: String or undefined. The value of options.source if passed to css.parse. Otherwise undefined.
  • line: Integer.
  • column: Integer.
  • source: String. The portion of code that couldn't be parsed.

When parsing with the silent option, errors are listed in the parsingErrors property of the stylesheet node instead of being thrown.

If you create any errors in plugins such as in rework, you must set the same properties for consistency.

AST

Interactively explore the AST with http://iamdustan.com/reworkcss_ast_explorer/.

Common properties

All nodes have the following properties.

position

Information about the position in the source string that corresponds to the node.

Object:

  • start: Object:
    • line: Number.
    • column: Number.
  • end: Object:
    • line: Number.
    • column: Number.
  • source: String or undefined. The value of options.source if passed to css.parse. Otherwise undefined.
  • content: String. The full source string passed to css.parse.

The line and column numbers are 1-based: The first line is 1 and the first column of a line is 1 (not 0).

The position property lets you know from which source file the node comes from (if available), what that file contains, and what part of that file was parsed into the node.

type

String. The possible values are the ones listed in the Types section below.

parent

A reference to the parent node, or null if the node has no parent.

Types

The available values of node.type are listed below, as well as the available properties of each node (other than the common properties listed above.)

stylesheet

The root node returned by css.parse.

  • stylesheet: Object:
    • rules: Array of nodes with the types rule, comment and any of the at-rule types.
    • parsingErrors: Array of Errors. Errors collected during parsing when option silent is true.

rule

  • selectors: Array of Strings. The list of selectors of the rule, split on commas. Each selector is trimmed from whitespace and comments.
  • declarations: Array of nodes with the types declaration and comment.

declaration

  • property: String. The property name, trimmed from whitespace and comments. May not be empty.
  • value: String. The value of the property, trimmed from whitespace and comments. Empty values are allowed.

comment

A rule-level or declaration-level comment. Comments inside selectors, properties and values etc. are lost.

  • comment: String. The part between the starting /* and the ending */ of the comment, including whitespace.

charset

The @charset at-rule.

  • charset: String. The part following @charset .

custom-media

The @custom-media at-rule.

  • name: String. The ---prefixed name.
  • media: String. The part following the name.

document

The @document at-rule.

  • document: String. The part following @document .
  • vendor: String or undefined. The vendor prefix in @document, or undefined if there is none.
  • rules: Array of nodes with the types rule, comment and any of the at-rule types.

font-face

The @font-face at-rule.

  • declarations: Array of nodes with the types declaration and comment.

host

The @host at-rule.

  • rules: Array of nodes with the types rule, comment and any of the at-rule types.

import

The @import at-rule.

  • import: String. The part following @import .

keyframes

The @keyframes at-rule.

  • name: String. The name of the keyframes rule.
  • vendor: String or undefined. The vendor prefix in @keyframes, or undefined if there is none.
  • keyframes: Array of nodes with the types keyframe and comment.

keyframe

  • values: Array of Strings. The list of “selectors” of the keyframe rule, split on commas. Each “selector” is trimmed from whitespace.
  • declarations: Array of nodes with the types declaration and comment.

media

The @media at-rule.

  • media: String. The part following @media .
  • rules: Array of nodes with the types rule, comment and any of the at-rule types.

namespace

The @namespace at-rule.

  • namespace: String. The part following @namespace .

page

The @page at-rule.

  • selectors: Array of Strings. The list of selectors of the rule, split on commas. Each selector is trimmed from whitespace and comments.
  • declarations: Array of nodes with the types declaration and comment.

supports

The @supports at-rule.

  • supports: String. The part following @supports .
  • rules: Array of nodes with the types rule, comment and any of the at-rule types.

Example

CSS:

body {
  background: #eee;
  color: #888;
}

Parse tree:

{
  "type": "stylesheet",
  "stylesheet": {
    "rules": [
      {
        "type": "rule",
        "selectors": [
          "body"
        ],
        "declarations": [
          {
            "type": "declaration",
            "property": "background",
            "value": "#eee",
            "position": {
              "start": {
                "line": 2,
                "column": 3
              },
              "end": {
                "line": 2,
                "column": 19
              }
            }
          },
          {
            "type": "declaration",
            "property": "color",
            "value": "#888",
            "position": {
              "start": {
                "line": 3,
                "column": 3
              },
              "end": {
                "line": 3,
                "column": 14
              }
            }
          }
        ],
        "position": {
          "start": {
            "line": 1,
            "column": 1
          },
          "end": {
            "line": 4,
            "column": 2
          }
        }
      }
    ]
  }
}

License

MIT