https://github.com/syntax-tree/hast-util-to-xast
utility to transform to xast (xml)
https://github.com/syntax-tree/hast-util-to-xast
hast hast-util html syntax-tree unist util xast xast-util xml
Last synced: 1 day ago
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utility to transform to xast (xml)
- Host: GitHub
- URL: https://github.com/syntax-tree/hast-util-to-xast
- Owner: syntax-tree
- License: mit
- Created: 2020-01-18T15:59:46.000Z (over 5 years ago)
- Default Branch: main
- Last Pushed: 2025-02-19T14:59:33.000Z (5 months ago)
- Last Synced: 2025-07-07T04:16:58.354Z (6 days ago)
- Topics: hast, hast-util, html, syntax-tree, unist, util, xast, xast-util, xml
- Language: JavaScript
- Homepage: https://unifiedjs.com
- Size: 118 KB
- Stars: 4
- Watchers: 8
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
- License: license
Awesome Lists containing this project
- awesome-syntax-tree - hast-util-to-xast - Transform to xast. (hast utilities)
README
# hast-util-to-xast
[![Build][badge-build-image]][badge-build-url]
[![Coverage][badge-coverage-image]][badge-coverage-url]
[![Downloads][badge-downloads-image]][badge-downloads-url]
[![Size][badge-size-image]][badge-size-url]
[hast][github-hast] (HTML) utility to transform to [xast][github-xast] (XML).
## Contents
* [What is this?](#what-is-this)
* [When should I use this?](#when-should-i-use-this)
* [Install](#install)
* [Use](#use)
* [API](#api)
* [`toXast(tree[, options])`](#toxasttree-options)
* [`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 takes a
[hast][github-hast] (HTML)
syntax tree as input and turns it into a
[xast][github-xast] (XML)
syntax tree.
This package also supports embedded MDX nodes.
## When should I use this?
This project is useful when you want to deal with ASTs,
and for some reason,
*have* to deal with XML.
One example of this is for EPUB (digital books).
There is no inverse of this utility,
because not all XML is HTML.
A similar package,
[`hast-util-to-estree`][github-hast-util-to-estree],
can turn hast into estree (JavaScript) as JSX,
which has some similarities to XML.
## Install
This package is [ESM only][github-gist-esm].
In Node.js (version 16+),
install with [npm][npmjs-install]:
```sh
npm install hast-util-to-xast
```
In Deno with [`esm.sh`][esmsh]:
```js
import {toXast} from 'https://esm.sh/hast-util-to-xast@3'
```
In browsers with [`esm.sh`][esmsh]:
```html
import {toXast} from 'https://esm.sh/hast-util-to-xast@3?bundle'
```
## Use
Say our document `example.html` contains:
```html
Hello, World!
👋, 🌍
```
…and our module `example.js` looks as follows:
```js
import fs from 'node:fs/promises'
import {fromHtml} from 'hast-util-from-html'
import {toXast} from 'hast-util-to-xast'
import {toXml} from 'xast-util-to-xml'
// Get the HTML syntax tree:
const hast = fromHtml(await fs.readFile('example.html'))
// Turn hast to xast:
const xast = toXast(hast)
// Serialize xast:
console.log(toXml(xast))
```
…now running `node example.js` yields:
```xml
Hello, World!
👋, 🌍
```
## API
This package exports the identifier [`toXast`][api-to-xast].
There is no default export.
### `toXast(tree[, options])`
Turn a [hast][github-hast] tree into a [xast][github-xast] tree.
###### Parameters
* `tree`
([`HastNode`][github-hast-nodes])
— hast tree to transform
* `options`
([`Options`][api-options], optional)
— configuration
###### Returns
xast tree ([`XastNode`][github-xast-nodes]).
### `Options`
Configuration (TypeScript type).
##### Fields
###### `space`
Which space the document is in
([`Space`][api-space], default: `'html'`).
When an `` element is found in the HTML space,
this package already automatically switches to and from the SVG space when
entering and exiting it.
You can also switch explicitly with `xmlns` properties in hast,
but note that only HTML and SVG are supported.
### `Space`
Namespace (TypeScript type).
###### Type
```ts
type Space = 'html' | 'svg'
```
## Types
This package is fully typed with [TypeScript][].
It exports the additional types [`Options`][api-options] and
[`Space`][api-space].
## Compatibility
Projects maintained by the unified collective are compatible with maintained
versions of Node.js.
When we cut a new major release,
we drop support for unmaintained versions of Node.
This means we try to keep the current release line,
`hast-util-to-xast@3`,
compatible with Node.js 16.
## Security
Both HTML and XML can be dangerous languages:
don’t trust user-provided data.
Use [`hast-util-santize`][github-hast-util-sanitize]
to make the hast tree safe before using this utility.
## Related
* [`hastscript`](https://github.com/syntax-tree/hastscript)
— create [hast][github-hast] (HTML or SVG) trees
* [`xastscript`](https://github.com/syntax-tree/xastscript)
— create [xast][github-xast] (XML) trees
* [`xast-util-to-xml`](https://github.com/syntax-tree/xast-util-to-xml)
— serialize as XML
## Contribute
See [`contributing.md`][health-contributing]
in
[`syntax-tree/.github`][health]
for ways to get started.
See [`support.md`][health-support] for ways to get help.
This project has a [code of conduct][health-coc].
By interacting with this repository,
organization,
or community you agree to abide by its terms.
## License
[MIT][file-license] © [Titus Wormer][wooorm]
[api-options]: #options
[api-space]: #space-1
[api-to-xast]: #toxasttree-options
[badge-build-image]: https://github.com/syntax-tree/hast-util-to-xast/workflows/main/badge.svg
[badge-build-url]: https://github.com/syntax-tree/hast-util-to-xast/actions
[badge-coverage-image]: https://img.shields.io/codecov/c/github/syntax-tree/hast-util-to-xast.svg
[badge-coverage-url]: https://codecov.io/github/syntax-tree/hast-util-to-xast
[badge-downloads-image]: https://img.shields.io/npm/dm/hast-util-to-xast.svg
[badge-downloads-url]: https://www.npmjs.com/package/hast-util-to-xast
[badge-size-image]: https://img.shields.io/bundlejs/size/hast-util-to-xast
[badge-size-url]: https://bundlejs.com/?q=hast-util-to-xast
[esmsh]: https://esm.sh
[file-license]: license
[github-gist-esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
[github-hast]: https://github.com/syntax-tree/hast
[github-hast-nodes]: https://github.com/syntax-tree/hast#nodes
[github-hast-util-sanitize]: https://github.com/syntax-tree/hast-util-sanitize
[github-hast-util-to-estree]: https://github.com/syntax-tree/hast-util-to-estree
[github-xast]: https://github.com/syntax-tree/xast
[github-xast-nodes]: https://github.com/syntax-tree/xast#nodes
[health]: https://github.com/syntax-tree/.github
[health-coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
[health-contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
[health-support]: https://github.com/syntax-tree/.github/blob/main/support.md
[npmjs-install]: https://docs.npmjs.com/cli/install
[typescript]: https://www.typescriptlang.org
[wooorm]: https://wooorm.com