WIP - add extractor, generate snippet_data

node_modules/unist-util-visit/readme.md

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+# unist-util-visit
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+
+[**unist**][unist] utility to visit nodes.
+
+## Install
+
+[npm][]:
+
+```bash
+npm install unist-util-visit
+```
+
+## Usage
+
+```javascript
+var u = require('unist-builder')
+var visit = require('unist-util-visit')
+
+var tree = u('tree', [
+  u('leaf', '1'),
+  u('node', [u('leaf', '2')]),
+  u('void'),
+  u('leaf', '3')
+])
+
+visit(tree, 'leaf', function(node) {
+  console.log(node)
+})
+```
+
+Yields:
+
+```js
+{ type: 'leaf', value: '1' }
+{ type: 'leaf', value: '2' }
+{ type: 'leaf', value: '3' }
+```
+
+## API
+
+### `visit(tree[, test], visitor[, reverse])`
+
+This function works exactly the same as [`unist-util-visit-parents`][vp],
+but `visitor` has a different signature.
+
+#### `next? = visitor(node, index, parent)`
+
+Instead of being passed an array of ancestors, `visitor` is invoked with the
+node’s [`index`][index] and its [`parent`][parent].
+
+Otherwise the same as [`unist-util-visit-parents`][vp].
+
+## Related
+
+*   [`unist-util-visit-parents`][vp]
+    — Like `visit`, but with a stack of parents
+*   [`unist-util-filter`](https://github.com/eush77/unist-util-filter)
+    — Create a new tree with all nodes that pass a test
+*   [`unist-util-map`](https://github.com/syntax-tree/unist-util-map)
+    — Create a new tree with all nodes mapped by a given function
+*   [`unist-util-remove`](https://github.com/eush77/unist-util-remove)
+    — Remove nodes from a tree that pass a test
+*   [`unist-util-select`](https://github.com/eush77/unist-util-select)
+    — Select nodes with CSS-like selectors
+
+## Contribute
+
+See [`contributing.md` in `syntax-tree/.github`][contributing] for ways to get
+started.
+See [`support.md`][support] for ways to get help.
+
+This project has a [Code of Conduct][coc].
+By interacting with this repository, organisation, or community you agree to
+abide by its terms.
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definition -->
+
+[build-badge]: https://img.shields.io/travis/syntax-tree/unist-util-visit.svg
+
+[build]: https://travis-ci.org/syntax-tree/unist-util-visit
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-visit.svg
+
+[coverage]: https://codecov.io/github/syntax-tree/unist-util-visit
+
+[downloads-badge]: https://img.shields.io/npm/dm/unist-util-visit.svg
+
+[downloads]: https://www.npmjs.com/package/unist-util-visit
+
+[size-badge]: https://img.shields.io/bundlephobia/minzip/unist-util-visit.svg
+
+[size]: https://bundlephobia.com/result?p=unist-util-visit
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[license]: license
+
+[author]: https://wooorm.com
+
+[contributing]: https://github.com/syntax-tree/.github/blob/master/contributing.md
+
+[support]: https://github.com/syntax-tree/.github/blob/master/support.md
+
+[coc]: https://github.com/syntax-tree/.github/blob/master/code-of-conduct.md
+
+[unist]: https://github.com/syntax-tree/unist
+
+[vp]: https://github.com/syntax-tree/unist-util-visit-parents
+
+[index]: https://github.com/syntax-tree/unist#index
+
+[parent]: https://github.com/syntax-tree/unist#parent-1