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[6a3a178] | 1 | # postcss-selector-parser [![Build Status](https://travis-ci.org/postcss/postcss-selector-parser.svg?branch=master)](https://travis-ci.org/postcss/postcss-selector-parser)
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| 2 |
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| 3 | > Selector parser with built in methods for working with selector strings.
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| 4 |
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| 5 | ## Install
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| 6 |
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| 7 | With [npm](https://npmjs.com/package/postcss-selector-parser) do:
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| 8 |
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| 9 | ```
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| 10 | npm install postcss-selector-parser
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| 11 | ```
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| 12 |
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| 13 | ## Quick Start
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| 14 |
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| 15 | ```js
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| 16 | const parser = require('postcss-selector-parser');
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| 17 | const transform = selectors => {
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| 18 | selectors.walk(selector => {
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| 19 | // do something with the selector
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| 20 | console.log(String(selector))
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| 21 | });
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| 22 | };
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| 23 |
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| 24 | const transformed = parser(transform).processSync('h1, h2, h3');
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| 25 | ```
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| 26 |
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| 27 | To normalize selector whitespace:
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| 28 |
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| 29 | ```js
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| 30 | const parser = require('postcss-selector-parser');
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| 31 | const normalized = parser().processSync('h1, h2, h3', {lossless: false});
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| 32 | // -> h1,h2,h3
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| 33 | ```
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| 34 |
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| 35 | Async support is provided through `parser.process` and will resolve a Promise
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| 36 | with the resulting selector string.
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| 37 |
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| 38 | ## API
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| 39 |
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| 40 | Please see [API.md](API.md).
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| 41 |
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| 42 | ## Credits
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| 43 |
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| 44 | * Huge thanks to Andrey Sitnik (@ai) for work on PostCSS which helped
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| 45 | accelerate this module's development.
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| 46 |
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| 47 | ## License
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| 48 |
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| 49 | MIT
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