phs (Parameterized HTML Schemas)

This is a library that can be used to describe and validate chunks of HTML. It is inspired by RELAX NG, but with a few very different goals. phs schemas are designed to:

• Accept placeholders for parameters, so that schemas can also be used to serialize and deserialize chunks of data to/from HTML. Not implemented yet.
• Be more concise and easier to author/read/understand than the full RELAX NG specification.
• Resemble the HTML they describe and be easily expressible in JSX notation.

Note: Currently this library contains the bare minimum to be at all useful.

How to use

Currently it's recommended to use JSX with the included transform-jsx-flexible Babel plugin. This allows you to continue using React or phs schemas within the same file.

Configure the plugin as follows in your .babelrc:

"plugins": [
    ...
    [ "./lib/babel-plugin-transform-jsx-flexible", {
        tags: {
            Schema: 'createSchemaElement',
        }
    } ],
    ...
]

In your JSX code files:

import { createSchemaElement, Schema, Element } from 'phs';

const schema = (
    <Schema>
        <Element name="p" />
    </Schema>
);

const fragment = /* DOM fragment or similar object returned by a parser */;

const result = schema.validateFragment( fragment );

console.log( result ); // either `true` or an `Error`

There are also a couple of validation functions other than validateFragment:

• validateNodes( arrayOfNodes )
• validateNode( singleNode )

Schema elements

<Element name="tagName">

Matches a single HTML element with the tag name tagName. tagName can also be a string like 'p|span' to provide a choice between multiple tag names.