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Project: syntax-tree/hast-util-from-parse5

Package: hast-util-from-parse5@7.0.0

  1. Dependencies: 8·Dependents: 18
  2. hast utility to transform from Parse5’s AST
  1. util 128
  2. utility 124
  3. unist 119
  4. hast 61
  5. hast-util 40
  6. ast 29
  7. transform 7
  8. change 4

hast-util-from-parse5

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hast utility to transform Parse5’s AST to a hast tree.

Install

This package is ESM only: Node 12+ is needed to use it and it must be imported instead of required.

npm:

npm install hast-util-from-parse5

Use

Say we have the following file, example.html:

<!doctype html><title>Hello!</title><h1 id="world">World!<!--after-->

And our script, example.js, looks as follows:

import vfile from 'to-vfile'
import parse5 from 'parse5'
import {inspect} from 'unist-util-inspect'
import {fromParse5} from 'hast-util-from-parse5'

var file = vfile.readSync('example.html')
var p5ast = parse5.parse(String(file), {sourceCodeLocationInfo: true})
var hast = fromParse5(p5ast, file)

console.log(inspect(hast))

Now, running node example yields:

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 following identifiers: fromParse5. There is no default export.

fromParse5(ast[, file|options])

Transform Parse5’s AST to a hast tree.

options

If options is a VFile, it’s treated as {file: options}.

options.space

Whether the root of the 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, used to add positional information to nodes. If given, the 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:

<img src="http://example.com/fav.ico" alt="foo" title="bar">

The verbose info would looks as follows:

{
  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) attack if Parse5’s AST is unsafe.

Contribute

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.

License

MIT © Titus Wormer