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postcss-selector-parser

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    postcss-selector-parser

> Selector parser with built in methods for working with selector strings.


Version published
Weekly downloads
36M
increased by4.09%
Maintainers
4
Install size
204 kB
Created
Weekly downloads
 

Package description

What is postcss-selector-parser?

The postcss-selector-parser npm package is a parser that helps in transforming CSS selectors. It provides a rich API to analyze and manipulate CSS selectors programmatically. This package is particularly useful for tasks related to CSS processing, such as linting, optimization, and custom transformations.

What are postcss-selector-parser's main functionalities?

Parsing and transforming selectors

This feature allows for the parsing and transformation of CSS selectors. In the provided code sample, all 'h1' tags in a selector are changed to 'h2' tags.

const parser = require('postcss-selector-parser');
const transform = selectors => {
  selectors.walkTags(tag => {
    if (tag.value === 'h1') {
      tag.value = 'h2';
    }
  });
};
const transformed = parser(transform).processSync('h1.class');

Extracting classes from selectors

This feature demonstrates how to extract class names from a selector. The code sample extracts 'class1' and 'class2' from the selector string '.class1.class2'.

const parser = require('postcss-selector-parser');
const extractClasses = selector => {
  const classes = [];
  parser(selectors => {
    selectors.walkClasses(classNode => {
      classes.push(classNode.value);
    });
  }).processSync(selector);
  return classes;
};
const classes = extractClasses('.class1.class2');

Working with pseudo classes

This feature focuses on manipulating pseudo classes within selectors. In the example, ':hover' pseudo classes are replaced with ':focus'.

const parser = require('postcss-selector-parser');
const transformPseudo = selector => {
  return parser(selectors => {
    selectors.walkPseudos(pseudo => {
      if (pseudo.value === ':hover') {
        pseudo.value = ':focus';
      }
    });
  }).processSync(selector);
};
const result = transformPseudo('a:hover');

Other packages similar to postcss-selector-parser

Changelog

Source

6.0.15

  • Fixed: Node#prev and Node#next type for the first/last node

Readme

Source

postcss-selector-parser test

Selector parser with built in methods for working with selector strings.

Install

With npm do:

npm install postcss-selector-parser

Quick Start

const parser = require('postcss-selector-parser');
const transform = selectors => {
    selectors.walk(selector => {
        // do something with the selector
        console.log(String(selector))
    });
};

const transformed = parser(transform).processSync('h1, h2, h3');

To normalize selector whitespace:

const parser = require('postcss-selector-parser');
const normalized = parser().processSync('h1, h2, h3', {lossless: false});
// -> h1,h2,h3

Async support is provided through parser.process and will resolve a Promise with the resulting selector string.

API

Please see API.md.

Credits

  • Huge thanks to Andrey Sitnik (@ai) for work on PostCSS which helped accelerate this module's development.

License

MIT

FAQs

Last updated on 29 Dec 2023

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