Module: Arrolio::Renderer::Pdf::Metadata

Included in:
Arrolio::Renderer::Pdf
Defined in:
lib/arrolio/renderer/pdf/metadata.rb

Overview

Extracted concern: Pdfrb coupling points kept out of the emission path.

Instance Method Summary collapse

Instance Method Details

#apply_metadata(metadata) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/metadata.rb', line 9

def apply_metadata(metadata)
  info = @document.catalog.value[:Info]
  info ||= @document.add({})
  @document.catalog.value[:Info] = info
  info.value[:Title] = metadata[:title] if metadata[:title]
  info.value[:Author] = metadata[:author] if metadata[:author]
  info.value[:Creator] = 'Arrolio (Ruby)'
  info.value[:Producer] = 'Arrolio + Pdfrb'
end

#attach_xmp_metadata(metadata) ⇒ Object

Emit an XMP metadata packet (RDF/XML) as a stream on the catalog's /Metadata entry. PDF readers use this for Dublin Core properties alongside the legacy /Info dict.



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# File 'lib/arrolio/renderer/pdf/metadata.rb', line 22

def attach_xmp_metadata(metadata)
  xmp = XmpBuilder.new(metadata).build
  stream = @document.add(
    { Type: :Metadata, Subtype: :XML, Length: xmp.bytesize },
    type: Pdfrb::Model::Cos::Stream
  )
  stream.stream = xmp
  @document.catalog.value[:Metadata] =
    Pdfrb::Model::Reference.new(stream.oid, stream.gen)
rescue StandardError => e
  Arrolio::Logger.warn "XMP attach failed: #{e.class}: #{e.message[0, 80]}"
end

#build_outline(context, _pages) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/metadata.rb', line 35

def build_outline(context, _pages)
  entries = context.heading_entries
  return unless entries&.any?

  pdfrb_pages = @document.pages.to_a
  ob = OutlineBuilder.new(document: @document,
                          entries: entries,
                          pdfrb_pages: pdfrb_pages)
  result = ob.build
  Arrolio::Logger.debug "outline build returned: #{result.class}"
rescue StandardError => e
  Arrolio::Logger.warn "outline build failed: #{e.class}: #{e.message[0,150]}"
  Arrolio::Logger.debug e.backtrace.first(5).join("\n")
end