@thinkeloquent/xast-append-ids

An xast plugin to append deterministic IDs to XML elements with proper namespace support.

Installation

npm install @thinkeloquent/xast-append-ids

Usage

import { unified } from 'unified';
import { fromXml } from 'xast-util-from-xml';
import { toXml } from 'xast-util-to-xml';
import xastAppendIds from '@thinkeloquent/xast-append-ids';

const processor = unified()
  .use(xastFromXml)
  .use(xastAppendIds, {
    selector: '*:not([xml:id])',
    attr: 'xml:id',
    strategy: 'hash',
    prefix: 'xml-',
    overwrite: false
  })
  .use(xastToXml);

const xml = '<root><element>Content</element></root>';
const result = processor.processSync(xml).toString();
// <root><element xml:id="xml-a1b2c3d4">Content</element></root>

Options

• selector (string, default: '*:not([id])') - CSS selector for targeting elements
• attr (string, default: 'data-ast-id') - Attribute name for the ID (supports namespaces like 'xml:id')
• strategy (string, default: 'hash') - ID generation strategy: 'hash', 'slug', or 'path'
• prefix (string, default: 'el-') - Prefix for generated IDs
• overwrite (boolean, default: false) - Whether to overwrite existing IDs
• namespace (string, optional) - XML namespace prefix for the ID attribute

Namespace Support

This plugin correctly handles XML namespaces. You can use namespaced attributes like xml:id:

{
  attr: 'xml:id',        // Namespaced attribute
  namespace: 'custom'    // Custom namespace prefix
}

ID Generation Strategies

Hash (Default)

Generates a deterministic hash from the element's path and content.

Slug

Creates IDs from the element's text content.

Path

Generates IDs based on the element's position in the tree.

Module System

This package uses ES Modules (ESM) with .mjs file extension. Make sure your project supports ESM or configure your build tools accordingly.

Dependencies

This package depends on:

• @thinkeloquent/id-generator - Core ID generation utilities
• xast-util-select - CSS selector support for XAST
• unist-util-visit - Tree traversal utilities

License

MIT