posthtml-attrs-parser

PostHTML plugin for parsing HTML attributes

A PostHTML helper plugin that provides a better API for working with tag attributes.

Usage

import posthtml from 'posthtml';
import parseAttrs from 'posthtml-attrs-parser';

posthtml()
  .use(function (tree) {
    const div = tree[0];
    const attrs = parseAttrs(div.attrs);

    attrs.style['font-size'] = '15px';
    attrs.class.push('title-sub');

    // Compose attributes back to PostHTML-compatible format
    div.attrs = attrs.compose();
  })
  .process('<div style="font-size: 14px" class="title">Hello!</div>')
  .then(function (result) {
    console.log(result.html);
  });

// <div style="font-size: 15px" class="title title-sub">Hello!</div>

Both ESM and CJS exports are provided, you can use the plugin in CJS too:

const posthtml = require('posthtml');
const parseAttrs = require('posthtml-attrs-parser');

// ...

Attributes

Only style and class attributes are parsed by default (as object and array, respectively). For other attributes, the parsing rules should be specified (see Custom parsing rule below).

Default attributes

style

<div style="color: red; font-size: 14px; color: blue"></div>

const attrs = parseAttrs(div.attrs);

console.log(attrs.style);
/*
{
  // If there are several properties with the same name,
  // the values are packed in array
  'color': ['red', 'blue'],
  'font-size': '14px'
}
*/

class

<div class="title title-sub"></div>

const attrs = parseAttrs(div.attrs);

console.log(attrs.class);
// ['title', 'title-sub']

Custom parsing rule

You may also define the parsing rule for other attributes.

Array-like attribute

<div data-ids="1  2 4 5   6"></div>

const attrs = parseAttrs(div.attrs, {
  rules: {
  'data-ids': {
    delimiter: /\s+/,
    // Optional parameter for stringifying attribute's values
    // If not set, glue = delimiter
    glue: ' '
  }
}
});

console.log(attrs['data-ids']);
// ['1', '2', '4', '5', '6']

console.log(attrs.compose()['data-ids']);
// 1 2 3 4 5 6

Object-like attribute

<div data-config="TEST=1;ENV=debug;PATH=."></div>

const attrs = parseAttrs(div.attrs, {
  rules: {
    'data-config': {
      // Delimiter for key-value pairs
      delimiter: ';',
      // Delimiter for a key-value
      keyDelimiter: '=',
      // Optional parameter for stringifying key-value pairs
      // If not set, keyGlue = keyDelimiter
      glue: '; ',
      // Optional parameter for stringifying a key-value
      // If not set, glue = delimiter
      keyGlue: ' = '
    }
  }
});

console.log(attrs['data-config']);
// {TEST: '1', ENV: 'debug', PATH: '.'}

console.log(attrs.compose()['data-config']);
// TEST = 1; ENV = debug; PATH = .