# hast-util-from-parse5
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[**hast**][hast] utility to transform [Parse5’s AST][ast] to a hast
[*tree*][tree].
## Install
[npm][]:
```sh
npm install hast-util-from-parse5
```
## Use
Say we have the following file, `example.html`:
```html
Hello!World!
```
And our script, `example.js`, looks as follows:
```js
var vfile = require('to-vfile')
var parse5 = require('parse5')
var inspect = require('unist-util-inspect')
var fromParse5 = require('hast-util-from-parse5')
var doc = vfile.readSync('example.html')
var ast = parse5.parse(String(doc), {sourceCodeLocationInfo: true})
var hast = fromParse5(ast, doc)
console.log(inspect(hast))
```
Now, running `node example` yields:
```text
root[2] (1:1-2:1, 0-70) [data={"quirksMode":false}]
├─ doctype (1:1-1:16, 0-15) [name="html"]
└─ element[2] [tagName="html"]
├─ element[1] [tagName="head"]
│ └─ element[1] (1:16-1:37, 15-36) [tagName="title"]
│ └─ text: "Hello!" (1:23-1:29, 22-28)
└─ element[1] [tagName="body"]
└─ element[3] (1:37-2:1, 36-70) [tagName="h1"][properties={"id":"world"}]
├─ text: "World!" (1:52-1:58, 51-57)
├─ comment: "after" (1:58-1:70, 57-69)
└─ text: "\n" (1:70-2:1, 69-70)
```
## API
### `fromParse5(ast[, options])`
Transform [Parse5’s AST][ast] to a [**hast**][hast] [*tree*][tree].
##### `options`
If `options` is a [`VFile`][vfile], it’s treated as `{file: options}`.
###### `options.space`
Whether the [*root*][root] of the [*tree*][tree] is in the `'html'` or `'svg'`
space (enum, `'svg'` or `'html'`, default: `'html'`).
If an element in with the SVG namespace is found in `ast`, `fromParse5`
automatically switches to the SVG space when entering the element, and switches
back when leaving.
###### `options.file`
[`VFile`][vfile], used to add [positional information][positional-information]
to [*nodes*][node].
If given, the [*file*][file] should have the original HTML source as its
contents.
###### `options.verbose`
Whether to add extra positional information about starting tags, closing tags,
and attributes to elements (`boolean`, default: `false`).
Note: not used without `file`.
For the following HTML:
```html
```
The verbose info would looks as follows:
```js
{
type: 'element',
tagName: 'img',
properties: {src: 'http://example.com/fav.ico', alt: 'foo', title: 'bar'},
children: [],
data: {
position: {
opening: {
start: {line: 1, column: 1, offset: 0},
end: {line: 1, column: 61, offset: 60}
},
closing: null,
properties: {
src: {
start: {line: 1, column: 6, offset: 5},
end: {line: 1, column: 38, offset: 37}
},
alt: {
start: {line: 1, column: 39, offset: 38},
end: {line: 1, column: 48, offset: 47}
},
title: {
start: {line: 1, column: 49, offset: 48},
end: {line: 1, column: 60, offset: 59}
}
}
}
},
position: {
start: {line: 1, column: 1, offset: 0},
end: {line: 1, column: 61, offset: 60}
}
}
```
## Security
Use of `hast-util-from-parse5` can open you up to a
[cross-site scripting (XSS)][xss] attack if Parse5’s AST is unsafe.
## 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, organization, or community you agree to
abide by its terms.
## License
[MIT][license] © [Titus Wormer][author]
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[collective]: https://opencollective.com/unified
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[chat]: https://spectrum.chat/unified/syntax-tree
[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
[ast]: https://github.com/inikulin/parse5/blob/master/packages/parse5/docs/tree-adapter/default/interface-list.md
[vfile]: https://github.com/vfile/vfile
[tree]: https://github.com/syntax-tree/unist#tree
[root]: https://github.com/syntax-tree/unist#root
[positional-information]: https://github.com/syntax-tree/unist#positional-information
[file]: https://github.com/syntax-tree/unist#file
[hast]: https://github.com/syntax-tree/hast
[node]: https://github.com/syntax-tree/hast#nodes
[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting