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hast-to-hyperscript

7.0.4 • Public • Published

hast-to-hyperscript

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hast utility to transform a tree to something else through a hyperscript DSL.

Install

npm:

npm install hast-to-hyperscript

Usage

var toH = require('hast-to-hyperscript')
var h = require('hyperscript')
 
var tree = {
  type: 'element',
  tagName: 'p',
  properties: {id: 'alpha', className: ['bravo']},
  children: [
    {type: 'text', value: 'charlie '},
    {
      type: 'element',
      tagName: 'strong',
      properties: {style: 'color: red;'},
      children: [{type: 'text', value: 'delta'}]
    },
    {type: 'text', value: ' echo.'}
  ]
}
 
// Transform (`hyperscript` needs `outerHTML` to stringify):
var doc = toH(h, tree).outerHTML
 
console.log(doc)

Yields:

<p class="bravo" id="alpha">charlie <strong>delta</strong> echo.</p>

API

toH(h, tree[, options|prefix])

Transform a hast tree to something else through a hyperscript DSL.

Parameters
  • h (Function) — Hyperscript function
  • tree (Node) — Tree to transform
  • prefix — Treated as {prefix: prefix}
  • options.prefix (string or boolean, optional) — Prefix to use as a prefix for keys passed in attrs to h(), this behaviour is turned off by passing false, turned on by passing a string. By default, h- is used as a prefix if the given h is detected as being virtual-dom/h or React.createElement
  • options.space (enum, 'svg' or 'html', default: 'html') — Whether node is in the 'html' or 'svg' space. If an svg element is found when inside the HTML space, toH automatically switches to the SVG space when entering the element, and switches back when exiting
Returns

* — Anything returned by invoking h().

function h(name, attrs, children)

Create an element from the given values.

Parameters
  • name (string) — Tag-name of element to create
  • attrs (Object.<string>) — Attributes to set
  • children (Array.<* | string>) — List of children (results of previously invoking h())
Returns

* — Anything.

Caveats
Nodes

Most Hyperscript implementations only support elements and texts. hast supports doctype, comment, and root as well.

  • If anything other than an element or root node is given, toH throws
  • If a root is given with no children, an empty div element is returned
  • If a root is given with one element child, that element is transformed
  • Otherwise, the children are wrapped in a div element

If unknown nodes (a node with a type not defined by hast) are found as descendants of the given tree, they are ignored: only text and element are transformed.

Support

Although there are lots of libraries mentioning support for a hyperscript-like interface, there are significant differences between them. For example, hyperscript doesn’t support classes in attrs and virtual-dom/h needs an attributes object inside attrs most of the time. toH works around these differences for:

Security

Use of hast-to-hyperscript can open you up to a cross-site scripting (XSS) attack if the hast tree is unsafe. Use hast-util-santize to make the hast tree safe.

Related

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, organisation, or community you agree to abide by its terms.

License

MIT © Titus Wormer

Install

npm i hast-to-hyperscript

DownloadsWeekly Downloads

330,982

Version

7.0.4

License

MIT

Unpacked Size

16.2 kB

Total Files

4

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