@antora/assembler/lib/select-mutable-attributes.js

A JavaScript library that merges AsciiDoc content from multiple pages in an Antora site into assembly files and delegates to an exporter to convert those files to another format, such as PDF.

'use strict'

function selectMutableAttributes (loadAsciiDoc, contentCatalog, referencePage, asciidocConfig) {
  const doc = loadAsciiDoc(
    new referencePage.constructor(
      Object.assign({}, referencePage, { contents: Buffer.alloc(0), mediaType: 'text/asciidoc' })
    ),
    contentCatalog,
    asciidocConfig
  )
  const additionalMutableNames = [
    'page-component-name',
    'page-component-version',
    'page-version',
    'page-component-display-version',
    'page-component-title',
  ]
  // we could consider using an Asciidoctor extension here to grab attributes passed via the API instead
  const immutableAttributeNames = doc.attribute_overrides.$keys()['$-'](additionalMutableNames)
  return Object.entries(doc.getAttributes()).reduce((accum, [name, val]) => {
    if (!immutableAttributeNames.includes(name)) accum[name] = val
    return accum
  }, {})
}

module.exports = selectMutableAttributes