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# unist-util-visit [![Build Status][build-badge]][build-page] [![Coverage Status][coverage-badge]][coverage-page]
[Unist][] node visitor. Useful with working with [**remark**][remark],
[**retext**][retext], or [**rehype**][rehype].
## Installation
[npm][]:
```bash
npm install unist-util-visit
```
## Usage
```javascript
var remark = require('remark');
var visit = require('unist-util-visit');
remark().use(plugin).process('Some _emphasis_, **importance**, and `code`.');
function plugin() {
return transformer;
function transformer(tree) {
visit(tree, 'text', visitor);
}
function visitor(node) {
console.log(node);
}
}
```
Yields:
```js
{type: 'text', value: 'Some '}
{type: 'text', value: 'emphasis'}
{type: 'text', value: ', '}
{type: 'text', value: 'strongness'}
{type: 'text', value: ', and '}
{type: 'text', value: '.'}
```
## API
### `visit(node[, type], visitor[, reverse])`
Visit nodes. Optionally by node type. Optionally in reverse.
###### Parameters
* `node` ([`Node`][node])
— Node to search;
* `type` (`string`, optional)
— Node type;
* `visitor` ([Function][visitor])
— Visitor invoked when a node is found;
* `reverse` (`boolean`, default: `false`)
— When falsey, checking starts at the first child and continues
through to later children. When truthy, this is reversed.
This **does not** mean checking starts at the deepest node and
continues on to the highest node.
#### `stop? = visitor(node, index, parent)`
Invoked when a node (when `type` is given, matching `type`) is found.
###### Parameters
* `node` (`Node`) — Found node;
* `index` (`number?`) — Position of `node` in `parent`;
* `index` (`Node?`) — Parent of `node`.
###### Returns
`boolean?` - When `false`, visiting is immediately stopped.
## License
[MIT][license] © [Titus Wormer][author]
<!-- Definition -->
[build-badge]: https://img.shields.io/travis/wooorm/unist-util-visit.svg
[build-page]: https://travis-ci.org/wooorm/unist-util-visit
[coverage-badge]: https://img.shields.io/codecov/c/github/wooorm/unist-util-visit.svg
[coverage-page]: https://codecov.io/github/wooorm/unist-util-visit?branch=master
[npm]: https://docs.npmjs.com/cli/install
[license]: LICENSE
[author]: http://wooorm.com
[unist]: https://github.com/wooorm/unist
[retext]: https://github.com/wooorm/retext
[remark]: https://github.com/wooorm/remark
[rehype]: https://github.com/wooorm/rehype
[node]: https://github.com/wooorm/unist#node
[visitor]: #stop--visitornode-index-parent
|
