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hast-util-from-parse5

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Readme

hast-util-from-parse5

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

Install

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:

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:

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 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.

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