# hast-util-from-parse5
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[hast][] utility to transform from [`parse5`][parse5]s AST.
## Contents
* [What is this?](#what-is-this)
* [When should I use this?](#when-should-i-use-this)
* [Install](#install)
* [Use](#use)
* [API](#api)
* [`fromParse5(tree[, file|options])`](#fromparse5tree-fileoptions)
* [`Options`](#options)
* [`Space`](#space-1)
* [Types](#types)
* [Compatibility](#compatibility)
* [Security](#security)
* [Related](#related)
* [Contribute](#contribute)
* [License](#license)
## What is this?
This package is a utility that can turn a parse5 tree into a hast tree.
## When should I use this?
You can use this package when using `parse5` as an HTML parser and wanting to
work with hast.
The utility [`hast-util-to-parse5`][hast-util-to-parse5] does the inverse of
this utility.
It generates `parse5`s AST again.
The utility [`hast-util-from-html`][hast-util-from-html] wraps this utility and
`parse5` to both parse HTML and generate hast from it.
## Install
This package is [ESM only][esm].
In Node.js (version 14.14+ and 16.0+), install with [npm][]:
```sh
npm install hast-util-from-parse5
```
In Deno with [`esm.sh`][esmsh]:
```js
import {fromParse5} from "https://esm.sh/hast-util-from-parse5@7"
```
In browsers with [`esm.sh`][esmsh]:
```html
<script type="module">
import {fromParse5} from "https://esm.sh/hast-util-from-parse5@7?bundle"
</script>
```
## Use
Say our document `example.html` contains:
```html
<!doctype html><title>Hello!</title><h1 id="world">World!<!--after-->
```
…and our module `example.js` looks as follows:
```js
import {parse} from 'parse5'
import {read} from 'to-vfile'
import {inspect} from 'unist-util-inspect'
import {fromParse5} from 'hast-util-from-parse5'
const file = await read('example.html')
const p5ast = parse(String(file), {sourceCodeLocationInfo: true})
const hast = fromParse5(p5ast, file)
console.log(inspect(hast))
```
…now running `node example.js` yields:
```text
root[2] (1:1-2:1, 0-70)
│ data: {"quirksMode":false}
├─0 doctype<html> (1:1-1:16, 0-15)
│ public: null
│ system: null
└─1 element<html>[2]
│ properties: {}
├─0 element<head>[1]
│ │ properties: {}
│ └─0 element<title>[1] (1:16-1:37, 15-36)
│ │ properties: {}
│ └─0 text "Hello!" (1:23-1:29, 22-28)
└─1 element<body>[1]
│ properties: {}
└─0 element<h1>[3] (1:37-2:1, 36-70)
│ properties: {"id":"world"}
├─0 text "World!" (1:52-1:58, 51-57)
├─1 comment "after" (1:58-1:70, 57-69)
└─2 text "\n" (1:70-2:1, 69-70)
```
## API
This package exports the identifier [`fromParse5`][fromparse5].
There is no default export.
### `fromParse5(tree[, file|options])`
Transform a `parse5` AST to hast.
###### Parameters
* `tree` ([`Parse5Node`][parse5-node])
— `parse5` tree to transform
* `file` ([`VFile`][vfile], optional)
— corresponding file (treated as `{file: file}`)
* `options` ([`Options`][options], optional)
— configuration
###### Returns
hast tree ([`HastNode`][hast-node]).
### `Options`
Configuration (TypeScript type).
##### Fields
###### `space`
Which space the document is in ([`Space`][space], default: `'html'`).
When an `<svg>` element is found in the HTML space, this package already
automatically switches to and from the SVG space when entering and exiting
it.
###### `file`
File used to add positional info to nodes ([`VFile`][vfile], optional).
If given, the file should represent the original HTML source.
###### `verbose`
Whether to add extra positional info about starting tags, closing tags,
and attributes to elements (`boolean`, default: `false`).
> 👉 **Note**: only used when `file` is given.
For the following HTML:
```html
<img src="http://example.com/fav.ico" alt="foo" title="bar">
```
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}
}
}
```
### `Space`
Namespace (TypeScript type).
###### Type
```ts
type Space = 'html' | 'svg'
```
## Types
This package is fully typed with [TypeScript][].
It exports the additional types [`Options`][options] and [`Space`][space].
## Compatibility
Projects maintained by the unified collective are compatible with all maintained
versions of Node.js.
As of now, that is Node.js 12.20+, 14.14+, 16.0+, and 18.0+.
Our projects sometimes work with older versions, but this is not guaranteed.
## 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.
## Related
* [`hast-util-to-parse5`](https://github.com/syntax-tree/hast-util-to-parse5)
— transform hast to Parse5’s AST
* [`hast-util-to-nlcst`](https://github.com/syntax-tree/hast-util-to-nlcst)
— transform hast to nlcst
* [`hast-util-to-mdast`](https://github.com/syntax-tree/hast-util-to-mdast)
— transform hast to mdast
* [`hast-util-to-xast`](https://github.com/syntax-tree/hast-util-to-xast)
— transform hast to xast
* [`mdast-util-to-hast`](https://github.com/syntax-tree/mdast-util-to-hast)
— transform mdast to hast
* [`mdast-util-to-nlcst`](https://github.com/syntax-tree/mdast-util-to-nlcst)
— transform mdast to nlcst
## Contribute
See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] 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]
<!-- Definitions -->
[build-badge]: https://github.com/syntax-tree/hast-util-from-parse5/workflows/main/badge.svg
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[coverage]: https://codecov.io/github/syntax-tree/hast-util-from-parse5
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[downloads]: https://www.npmjs.com/package/hast-util-from-parse5
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[size]: https://bundlephobia.com/result?p=hast-util-from-parse5
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[backers-badge]: https://opencollective.com/unified/backers/badge.svg
[collective]: https://opencollective.com/unified
[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
[chat]: https://github.com/syntax-tree/unist/discussions
[npm]: https://docs.npmjs.com/cli/install
[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
[esmsh]: https://esm.sh
[typescript]: https://www.typescriptlang.org
[license]: license
[author]: https://wooorm.com
[health]: https://github.com/syntax-tree/.github
[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
[support]: https://github.com/syntax-tree/.github/blob/main/support.md
[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
[parse5]: https://github.com/inikulin/parse5
[parse5-node]: https://github.com/inikulin/parse5/blob/master/packages/parse5/lib/tree-adapters/default.ts
[vfile]: https://github.com/vfile/vfile
[hast-util-to-parse5]: https://github.com/syntax-tree/hast-util-to-parse5
[hast]: https://github.com/syntax-tree/hast
[hast-util-from-html]: https://github.com/syntax-tree/hast-util-from-html
[hast-node]: https://github.com/syntax-tree/hast#nodes
[fromparse5]: #fromparse5tree-fileoptions
[options]: #options
[space]: #space-1