137 lines
3.6 KiB
Markdown
137 lines
3.6 KiB
Markdown
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# unist-util-visit
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[![Build][build-badge]][build]
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[![Coverage][coverage-badge]][coverage]
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[![Downloads][downloads-badge]][downloads]
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[![Size][size-badge]][size]
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[![Sponsors][sponsors-badge]][collective]
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[![Backers][backers-badge]][collective]
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[![Chat][chat-badge]][chat]
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[**unist**][unist] utility to visit nodes.
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## Install
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[npm][]:
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```sh
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npm install unist-util-visit
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```
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## Use
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```js
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var u = require('unist-builder')
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var visit = require('unist-util-visit')
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var tree = u('tree', [
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u('leaf', '1'),
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u('node', [u('leaf', '2')]),
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u('void'),
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u('leaf', '3')
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])
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visit(tree, 'leaf', function(node) {
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console.log(node)
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})
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```
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Yields:
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```js
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{ type: 'leaf', value: '1' }
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{ type: 'leaf', value: '2' }
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{ type: 'leaf', value: '3' }
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```
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## API
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### `visit(tree[, test], visitor[, reverse])`
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This function works exactly the same as [`unist-util-visit-parents`][vp],
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but `visitor` has a different signature.
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#### `next? = visitor(node, index, parent)`
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Instead of being passed an array of ancestors, `visitor` is invoked with the
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node’s [`index`][index] and its [`parent`][parent].
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Otherwise the same as [`unist-util-visit-parents`][vp].
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## Related
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* [`unist-util-visit-parents`][vp]
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— Like `visit`, but with a stack of parents
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* [`unist-util-filter`](https://github.com/syntax-tree/unist-util-filter)
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— Create a new tree with all nodes that pass a test
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* [`unist-util-map`](https://github.com/syntax-tree/unist-util-map)
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— Create a new tree with all nodes mapped by a given function
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* [`unist-util-flatmap`](https://gitlab.com/staltz/unist-util-flatmap)
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— Create a new tree by mapping (to an array) with the given function
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* [`unist-util-remove`](https://github.com/syntax-tree/unist-util-remove)
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— Remove nodes from a tree that pass a test
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* [`unist-util-select`](https://github.com/syntax-tree/unist-util-select)
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— Select nodes with CSS-like selectors
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## Contribute
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See [`contributing.md` in `syntax-tree/.github`][contributing] for ways to get
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started.
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See [`support.md`][support] for ways to get help.
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This project has a [code of conduct][coc].
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By interacting with this repository, organization, or community you agree to
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abide by its terms.
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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definition -->
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[build-badge]: https://img.shields.io/travis/syntax-tree/unist-util-visit.svg
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[build]: https://travis-ci.org/syntax-tree/unist-util-visit
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[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-visit.svg
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[coverage]: https://codecov.io/github/syntax-tree/unist-util-visit
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[downloads-badge]: https://img.shields.io/npm/dm/unist-util-visit.svg
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[downloads]: https://www.npmjs.com/package/unist-util-visit
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[size-badge]: https://img.shields.io/bundlephobia/minzip/unist-util-visit.svg
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[size]: https://bundlephobia.com/result?p=unist-util-visit
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[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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[backers-badge]: https://opencollective.com/unified/backers/badge.svg
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[collective]: https://opencollective.com/unified
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[chat-badge]: https://img.shields.io/badge/chat-spectrum-7b16ff.svg
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[chat]: https://spectrum.chat/unified/syntax-tree
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[npm]: https://docs.npmjs.com/cli/install
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[license]: license
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[author]: https://wooorm.com
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[contributing]: https://github.com/syntax-tree/.github/blob/HEAD/contributing.md
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[support]: https://github.com/syntax-tree/.github/blob/HEAD/support.md
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[coc]: https://github.com/syntax-tree/.github/blob/HEAD/code-of-conduct.md
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[unist]: https://github.com/syntax-tree/unist
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[vp]: https://github.com/syntax-tree/unist-util-visit-parents
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[index]: https://github.com/syntax-tree/unist#index
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[parent]: https://github.com/syntax-tree/unist#parent-1
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