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syntax-tree/xast-util-from-xml: utility to parse from XML

xast utility to parse from XML.

• What is this?
• When should I use this?
• Install
• Use
• API
  • fromXml(value)
• Types
• Compatibility
• Security
• Related
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• License

This package is a utility that takes serialized XML as input and turns it into a xast syntax tree. It uses @rgrove/parse-xml, which is a good and fast XML parser, and turns its results into xast.

If you want to use xast syntax trees, use this.

The utility xast-util-to-xml does the inverse of this utility. It turns xast into XML.

This package is ESM only. In Node.js (version 16+), install with npm:

npm install xast-util-from-xml

In Deno with esm.sh:

import {fromXml} from 'https://esm.sh/xast-util-from-xml@4'

In browsers with esm.sh:

<script type="module">
  import {fromXml} from 'https://esm.sh/xast-util-from-xml@4?bundle'
</script>

Say our document example.xml contains:

<album id="123">
  <name>Born in the U.S.A.</name>
  <artist>Bruce Springsteen</artist>
  <releasedate>1984-04-06</releasedate>
</album>

…and our module example.js looks as follows:

import fs from 'node:fs/promises'
import {fromXml} from 'xast-util-from-xml'

const tree = fromXml(await fs.readFile('example.xml'))

console.dir(tree, {depth: undefined})

…now running node example.js yields (positional info removed for brevity):

{
  type: 'root',
  children: [
    {
      type: 'element',
      name: 'album',
      attributes: {id: '123'},
      children: [
        {type: 'text', value: '\n  '},
        {
          type: 'element',
          name: 'name',
          attributes: {},
          children: [{type: 'text', value: 'Born in the U.S.A.'}]
        },
        {type: 'text', value: '\n  '},
        {
          type: 'element',
          name: 'artist',
          attributes: {},
          children: [{type: 'text', value: 'Bruce Springsteen'}]
        },
        {type: 'text', value: '\n  '},
        {
          type: 'element',
          name: 'releasedate',
          attributes: {},
          children: [{type: 'text', value: '1984-04-06'}]
        },
        {type: 'text', value: '\n'}
      ]
    }
  ]
}

This package exports the identifier fromXml. There is no default export.

Parse a string of XML to a xast tree.

• value (Uint8Array in UTF-8 or string). — serialized XML

xast root (Root).

When the XML cannot be parsed with @rgrove/parse-xml, a VFileMessage is thrown.

This can for example happen when passing archaic or unsafe XML (such as entities), or just otherwise invalid XML such as missnested tags.

This package is fully typed with TypeScript. It exports no additional types.

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, xast-util-from-xml@^4, compatible with Node.js 16.

XML can be a dangerous language: don’t trust user-provided data.

• xast-util-to-xml — serialize xast to XML
• hast-util-to-xast — transform hast (html, svg) to xast (xml)
• xastscript — create xast trees

See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

MIT © Titus Wormer

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