unified

Project: syntax-tree/unist-util-select

Package: unist-util-select@4.0.1

  1. Dependents: 161
  2. unist utility to select nodes with CSS-like selectors
  1. util 144
  2. utility 140
  3. unist 127
  4. tree 41
  5. ast 33
  6. unist-util 25
  7. node 25
  8. find 11
  9. walk 8
  10. attribute 8
  11. expression 7
  12. visit 6
  13. filter 5
  14. selector 4
  15. type 3
  16. select 2
  17. match 2

unist-util-select

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

Note that the DOM has references to their parent nodes, meaning that document.body.matches(':last-child') can be evaluated. This information is not stored in unist, so selectors like that don’t work.

View the list of supported selectors »

Install

This package is ESM only: Node 12+ is needed to use it and it must be imported instead of required.

npm:

npm install unist-util-select

API

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

matches(selector, node)

Check that the given node matches selector. Returns boolean, whether the node matches or not.

This only checks the element itself, not the surrounding tree. Thus, nesting in selectors is not supported (paragraph strong, paragraph > strong), nor are selectors like :first-child, etc. This only checks that the given element matches the selector.

import {u} from 'unist-builder'
import {matches} from 'unist-util-select'

matches('strong, em', u('strong', [u('text', 'important')])) // => true
matches('[lang]', u('code', {lang: 'js'}, 'console.log(1)')) // => true

select(selector, tree)

Select the first node matching selector in the given tree (could be the tree itself). Returns the found node, if any.

import {u} from 'unist-builder'
import {select} from 'unist-util-select'

console.log(
  select(
    'code ~ :nth-child(even)',
    u('blockquote', [
      u('paragraph', [u('text', 'Alpha')]),
      u('paragraph', [u('text', 'Bravo')]),
      u('code', 'Charlie'),
      u('paragraph', [u('text', 'Delta')]),
      u('paragraph', [u('text', 'Echo')])
    ])
  )
)

Yields:

{type: 'paragraph', children: [{type: 'text', value: 'Delta'}]}

selectAll(selector, tree)

Select all nodes matching selector in the given tree (could include the tree itself). Returns all found nodes, if any.

import {u} from 'unist-builder'
import {selectAll} from 'unist-util-select'

console.log(
  selectAll(
    'code ~ :nth-child(even)',
    u('blockquote', [
      u('paragraph', [u('text', 'Alpha')]),
      u('paragraph', [u('text', 'Bravo')]),
      u('code', 'Charlie'),
      u('paragraph', [u('text', 'Delta')]),
      u('paragraph', [u('text', 'Echo')]),
      u('paragraph', [u('text', 'Foxtrot')]),
      u('paragraph', [u('text', 'Golf')])
    ])
  )
)

Yields:

[
  {type: 'paragraph', children: [{type: 'text', value: 'Delta'}]},
  {type: 'paragraph', children: [{type: 'text', value: 'Foxtrot'}]}
]

Support

Notes

Contribute

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.

License

MIT © Eugene Sharygin