Class: Asciidoctor::Rhrev::ChangeBarsHtmlTreeprocessor

Inherits:
Extensions::Treeprocessor
  • Object
show all
Defined in:
lib/asciidoctor/rhrev/rhrev_html.rb

Overview

Tags blocks marked with the current revision (revnumber 1.2 => attribute rhrev1-2) with the rhrev-changed role so a stylesheet can draw an HTML change bar (border on the right side). Enabled by the rhrev-change-bars document attribute, mirroring the PDF backend. The rhrev-change-bars-color, -width, and -offset attributes are emitted as CSS custom properties; the side is always right in HTML output (no recto/verso model).

Constant Summary collapse

TRACKED_CONTEXTS = 
[:section, :floating_title, :example, :listing, :table, :image].freeze

Instance Method Summary collapse

Instance Method Details

#process(document) ⇒ Object 



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# File 'lib/asciidoctor/rhrev/rhrev_html.rb', line 17

def process document
  return document unless document.basebackend? 'html'
  return document unless document.attr? 'rhrev-change-bars'
  return document unless (revnumber = document.attr 'revnumber')
  prefix = document.attr 'revhistoryprefix', 'rhrev'
  change_attr = %(#{prefix}#{revnumber.to_s.tr '.', '-'})

  tagged = false
  document.find_by { |b| TRACKED_CONTEXTS.include? b.context }.each do |block|
    next unless block.attributes && (block.attributes.key? change_attr)
    roles = (block.attr 'role')
    block.set_attr 'role', [roles, 'rhrev-changed'].compact.join(' ')
    tagged = true
  end
  return document unless tagged

  overrides = []
  if (color = document.attr 'rhrev-change-bars-color')
    overrides << %(--rhrev-change-bar-color: ##{color.to_s.delete_prefix '#'};)
  end
  if (width = document.attr 'rhrev-change-bars-width')
    overrides << %(--rhrev-change-bar-width: #{width}px;)
  end
  if (offset = document.attr 'rhrev-change-bars-offset')
    overrides << %(--rhrev-change-bar-offset: #{offset}px;)
  end
  unless overrides.empty?
    style = create_block document, :pass, %(<style>:root { #{overrides.join ' '} }</style>), {}
    document.blocks.unshift style
  end
  document
end