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postcss-selector-parser
Advanced tools
> Selector parser with built in methods for working with selector strings.
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.
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');
css-what is a CSS selector parser that can parse selectors into an understandable format but does not offer the same level of manipulation and transformation capabilities as postcss-selector-parser.
css-selector-tokenizer can tokenize and parse CSS selectors. It provides a different API and approach compared to postcss-selector-parser, focusing more on the tokenization aspect rather than direct manipulation.
scss-parser is designed to parse SCSS syntax. While it can handle selectors within the SCSS syntax, its primary focus is broader than just selectors, making it less specialized compared to postcss-selector-parser.
Selector parser with built in methods for working with selector strings.
With npm do:
npm install postcss-selector-parser
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.
Please see API.md.
MIT
3.0.0
process
API is now
async, and the sync API is now accessed through processSync
instead.process()
and processSync()
now return a string instead of the Processor
instance.ast()
and astSync()
methods have been added to the Processor
. These
return the Root
node of the selectors after processing them.transform()
and transformSync()
methods have been added to the
Processor
. These return the value returned by the processor callback
after processing the selectors.process
, ast
and transform
(and their sync variants) now accept a
postcss
rule node. When provided, better errors are generated and selector
processing is automatically set back to the rule selector (unless the updateSelector
option is set to false
.)The pattern of:
rule.selector = processor.process(rule.selector).result.toString();
is now:
processor.processSync(rule)
FAQs
> Selector parser with built in methods for working with selector strings.
The npm package postcss-selector-parser receives a total of 31,169,996 weekly downloads. As such, postcss-selector-parser popularity was classified as popular.
We found that postcss-selector-parser demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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