hast-util-parse-selector

What is hast-util-parse-selector?

The hast-util-parse-selector npm package is a utility for parsing CSS selectors into HAST (Hypertext Abstract Syntax Tree) elements. It allows developers to convert CSS-like selectors into HAST nodes, which can then be manipulated or inspected within JavaScript. This is particularly useful when working with virtual DOMs or when generating HTML content dynamically.

What are hast-util-parse-selector's main functionalities?

Parsing simple selectors

This feature allows for the parsing of simple CSS selectors into HAST nodes. The example demonstrates parsing a selector for a `div` element with an ID of `id` and a class of `className`.

const parseSelector = require('hast-util-parse-selector');
const h = parseSelector('div#id.className');
console.log(h);

Parsing selectors with attributes

This feature enables parsing of selectors that include attributes. The example shows how to parse a selector for an `input` element with a `type` attribute of `text` and a class of `className`.

const parseSelector = require('hast-util-parse-selector');
const h = parseSelector('input[type=text].className');
console.log(h);

Customizing the tag name

This feature allows for customization of the tag name when it is not specified in the selector. The example demonstrates setting a default tag name of `span` for a selector that only specifies a class name.

const parseSelector = require('hast-util-parse-selector');
const h = parseSelector('.className', {tagName: 'span'});
console.log(h);

Other packages similar to hast-util-parse-selector

postcss-selector-parser

postcss-selector-parser is a parser for CSS selectors that allows for manipulation and inspection of CSS selectors. It is similar to hast-util-parse-selector in its parsing capabilities but is tailored more towards CSS processing and transformation rather than converting selectors into HAST nodes.

css-what

css-what is a fast CSS selector parser that converts selectors into an abstract syntax tree (AST). While it shares the parsing aspect with hast-util-parse-selector, css-what focuses on CSS selectors for the purpose of selector querying and manipulation rather than generating HAST nodes.

README

hast-util-parse-selector

Parse a simple CSS selector to a HAST node.

Installation

npm:

npm install hast-util-parse-selector

Usage

var parseSelector = require('hast-util-parse-selector')

console.log(parseSelector('.quux#bar.baz.qux'))

Yields:

{ type: 'element',
  tagName: 'div',
  properties: { id: 'bar', className: [ 'quux', 'baz', 'qux' ] },
  children: [] }

API

parseSelector([selector][, defaultTagName])

Parse a CSS selector to a HAST node.

selector

string, optional — Can contain a tag-name (foo), classes (.bar), and an ID (#baz). Multiple classes are allowed. Uses the last ID if multiple IDs are found.

defaultTagName

string, optional, defaults to div — Tag name to use if selector does not specify one.

Returns

Node.

Contribute

See contributing.md in syntax-tree/hast for ways to get started.

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License

MIT © Titus Wormer