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Showing content from https://github.com/syntax-tree/hast-util-select below:

syntax-tree/hast-util-select: utility to add `querySelector`, `querySelectorAll`, and `matches` support for hast

hast utility with equivalents for matches, querySelector, and querySelectorAll.

This package lets you find nodes in a tree, similar to how matches, querySelector, and querySelectorAll work with the DOM.

One notable difference between DOM and hast is that DOM nodes have references to their parents, meaning that document.body.matches(':last-child') can be evaluated to check whether the body is the last child of its parent. This information is not stored in hast, so selectors like that don’t work.

This is a small utility that is quite useful, but is rather slow if you use it a lot. For each call, it has to walk the entire tree. In some cases, walking the tree once with unist-util-visit is smarter, such as when you want to change certain nodes. On the other hand, this is quite powerful and fast enough for many other cases.

This utility is similar to unist-util-select, which can find and match any unist node.

This package is ESM only. In Node.js (version 16+), install with npm:

npm install hast-util-select

In Deno with esm.sh:

import {matches, select, selectAll} from 'https://esm.sh/hast-util-select@6'

In browsers with esm.sh:

<script type="module">
  import {matches, select, selectAll} from 'https://esm.sh/hast-util-select@6?bundle'
</script>
import {h} from 'hastscript'
import {matches, select, selectAll} from 'hast-util-select'

const tree = h('section', [
  h('p', 'Alpha'),
  h('p', 'Bravo'),
  h('h1', 'Charlie'),
  h('p', 'Delta'),
  h('p', 'Echo'),
  h('p', 'Foxtrot'),
  h('p', 'Golf')
])

console.log(matches('section', tree)) // `true`

console.log(select('h1 ~ :nth-child(even)', tree))
// The paragraph with `Delta`

console.log(selectAll('h1 ~ :nth-child(even)', tree))
// The paragraphs with `Delta` and `Foxtrot`

This package exports the identifiers matches, select, and selectAll. There is no default export.

matches(selector, node[, space])

Check that the given node matches selector.

This only checks the element itself, not the surrounding tree. Thus, nesting in selectors is not supported (p b, p > b), neither are selectors like :first-child, etc. This only checks that the given element matches the selector.

Whether node matches selector (boolean).

import {h} from 'hastscript'
import {matches} from 'hast-util-select'

matches('b, i', h('b')) // => true
matches(':any-link', h('a')) // => false
matches(':any-link', h('a', {href: '#'})) // => true
matches('.classy', h('a', {className: ['classy']})) // => true
matches('#id', h('a', {id: 'id'})) // => true
matches('[lang|=en]', h('a', {lang: 'en'})) // => true
matches('[lang|=en]', h('a', {lang: 'en-GB'})) // => true
select(selector, tree[, space])

Select the first element that matches selector in the given tree. Searches the tree in preorder.

First element in tree that matches selector or undefined if nothing is found. This could be tree itself.

import {h} from 'hastscript'
import {select} from 'hast-util-select'

console.log(
  select(
    'h1 ~ :nth-child(even)',
    h('section', [
      h('p', 'Alpha'),
      h('p', 'Bravo'),
      h('h1', 'Charlie'),
      h('p', 'Delta'),
      h('p', 'Echo')
    ])
  )
)

Yields:

{ type: 'element',
  tagName: 'p',
  properties: {},
  children: [ { type: 'text', value: 'Delta' } ] }
selectAll(selector, tree[, space])

Select all elements that match selector in the given tree. Searches the tree in preorder.

Elements in tree that match selector. This could include tree itself.

import {h} from 'hastscript'
import {selectAll} from 'hast-util-select'

console.log(
  selectAll(
    'h1 ~ :nth-child(even)',
    h('section', [
      h('p', 'Alpha'),
      h('p', 'Bravo'),
      h('h1', 'Charlie'),
      h('p', 'Delta'),
      h('p', 'Echo'),
      h('p', 'Foxtrot'),
      h('p', 'Golf')
    ])
  )
)

Yields:

[ { type: 'element',
    tagName: 'p',
    properties: {},
    children: [ { type: 'text', value: 'Delta' } ] },
  { type: 'element',
    tagName: 'p',
    properties: {},
    children: [ { type: 'text', value: 'Foxtrot' } ] } ]

Namespace (TypeScript type).

type Space = 'html' | 'svg'

This package is fully typed with TypeScript. It exports the additional type Space.

Projects maintained by the unified collective are compatible with maintained versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line, hast-util-select@6, compatible with Node.js 16.

This package does not change the syntax tree so there are no openings for cross-site scripting (XSS) attacks.

See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

MIT © Titus Wormer

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