Class: Asciidoctor::PDF::Converter

Inherits:
Prawn::Document
  • Object
show all
Includes:
Converter, Logging, Asciidoctor::Prawn::Extensions, Writer
Defined in:
lib/asciidoctor/pdf/converter.rb

Constant Summary collapse

CodeRayRequirePath =

NOTE: require_library doesn’t support require_relative and we don’t modify the load path for this gem

::File.join __dir__, 'ext/prawn/coderay_encoder'
RougeRequirePath = 
::File.join __dir__, 'ext/rouge'
PygmentsRequirePath = 
::File.join __dir__, 'ext/pygments'
OptimizerRequirePath = 
::File.join __dir__, 'optimizer'
AdmonitionIcons = 
{
  caution: { name: 'fas-fire', stroke_color: 'BF3400', size: 24 },
  important: { name: 'fas-exclamation-circle', stroke_color: 'BF0000', size: 24 },
  note: { name: 'fas-info-circle', stroke_color: '19407C', size: 24 },
  tip: { name: 'far-lightbulb', stroke_color: '111111', size: 24 },
  warning: { name: 'fas-exclamation-triangle', stroke_color: 'BF6900', size: 24 },
}
TextAlignmentNames = 
{ 'justify' => true, 'left' => true, 'center' => true, 'right' => true }
IndentableTextAlignments = 
{ justify: true, left: true }
TextAlignmentRoles = 
{ 'text-justify' => true, 'text-left' => true, 'text-center' => true, 'text-right' => true }
TextDecorationStyleTable = 
{ 'underline' => :underline, 'line-through' => :strikethrough }
FontKerningTable = 
{ 'normal' => true, 'none' => false }
BlockFloatNames = 
%w(left right)
BlockAlignmentNames = 
%w(left center right)
ColumnPositions = 
[:left, :center, :right]
PageLayouts = 
[:portrait, :landscape]
PageSides = 
[:recto, :verso]
AuthorAttributeNames = 
{ name: 'author', initials: 'authorinitials', firstname: 'firstname', middlename: 'middlename', lastname: 'lastname', email: 'email' }
DoubleSpace = 
'  '
LF = 
?\n
DoubleLF = 
LF * 2
TAB = 
?\t
InnerIndent = 
LF + ' '
GuardedIndent =

a no-break space is used to replace a leading space to prevent Prawn from trimming indentation a leading zero-width space can’t be used as it gets dropped when calculating the line width

?\u00a0
GuardedInnerIndent = 
LF + GuardedIndent
TabRx = 
/\t/
TabIndentRx = 
/^\t+/
NoBreakSpace = 
?\u00a0
ZeroWidthSpace = 
?\u200b
DummyText = 
?\u0000
DigitsRx = 
/^\d+$/
DotLeaderTextDefault = 
'. '
EmDash = 
?\u2014
RightPointer = 
?\u25ba
LowercaseGreekA = 
?\u03b1
Bullets = 
{
  disc: ?\u2022,
  circle: ?\u25e6,
  square: ?\u25aa,
  none: '',
}
BallotBox =

NOTE: default theme font uses ballot boxes from FontAwesome

{
  checked: ?\u2611,
  unchecked: ?\u2610,
}
ConumSets = 
{
  'circled' => (?\u2460..?\u2473).to_a,
  'filled' => (?\u2776..?\u277f).to_a + (?\u24eb..?\u24f4).to_a,
}
TypographicQuotes = 
%w(“ ” ‘ ’)
InlineFormatSniffRx = 
/[<&]/
SimpleAttributeRefRx = 
/(?<!\\)\{\w+(?:-\w+)*\}/
MeasurementRxt = 
'\\d+(?:\\.\\d+)?(?:in|cm|mm|p[txc])?'
MeasurementPartsRx = 
/^(\d+(?:\.\d+)?)(in|mm|cm|p[txc])?$/
PageSizeRx = 
/^(?:\[(#{MeasurementRxt}), ?(#{MeasurementRxt})\]|(#{MeasurementRxt})(?: x |x)(#{MeasurementRxt})|\S+)$/
CalloutExtractRx = 
%r((?:(?://|#|--|;;) ?)?(\\)?<!?(|--)(\d+|\.)\2> ?(?=(?:\\?<!?\2(?:\d+|\.)\2> ?)*$))
ImageAttributeValueRx = 
/^\Aimage:{1,2}(.*?)\[(.*?)\]$\Z/
StopPunctRx = 
/[.!?;:]$/
UriBreakCharsRx = 
%r((?:/|\?|&amp;|#)(?!$))
UriBreakCharRepl = 
%(\\&#{ZeroWidthSpace})
UriSchemeBoundaryRx = 
%r((?<=://))
UrlSniffRx = 
%r(^\p{Alpha}[\p{Alnum}+.-]*://)
LineScanRx = 
/\n|.+/
BlankLineRx = 
/\n{2,}/
CjkLineBreakRx = 
/(?=[\u3000\u30a0-\u30ff\u3040-\u309f\p{Han}\uff00-\uffef])/
WhitespaceChars = 
' ' + TAB + LF
DoubleSpaceRx = 
/ (?= )/
ValueSeparatorRx = 
/;|,/
HexColorRx = 
/^#[a-fA-F0-9]{6}$/
VimeoThumbnailRx = 
%r(<thumbnail_url>(.*?)</thumbnail_url>)
DropAnchorRx = 
%r(<(?:a\b[^>]*|/a)>)
SourceHighlighters = 
%w(coderay pygments rouge).to_set
ViewportWidth = 
::Module.new
ImageWidth = 
::Module.new

Constants included from Asciidoctor::Prawn::Extensions

Asciidoctor::Prawn::Extensions::ColumnBox, Asciidoctor::Prawn::Extensions::DetectEmptyFirstPage, Asciidoctor::Prawn::Extensions::DetectEmptyFirstPageProc, Asciidoctor::Prawn::Extensions::FontAwesomeIconSets, Asciidoctor::Prawn::Extensions::IconSetPrefixes, Asciidoctor::Prawn::Extensions::IconSets, Asciidoctor::Prawn::Extensions::InhibitNewPageProc, Asciidoctor::Prawn::Extensions::InitialPageContent, Asciidoctor::Prawn::Extensions::NewPageRequiredError, Asciidoctor::Prawn::Extensions::PlaceholderChar

Constants included from TextTransformer

TextTransformer::BareClassRx, TextTransformer::ContiguousCharsRx, TextTransformer::Hyphen, TextTransformer::LowerAlphaChars, TextTransformer::PCDATAFilterRx, TextTransformer::SmallCapsChars, TextTransformer::SoftHyphen, TextTransformer::TagFilterRx, TextTransformer::WordRx, TextTransformer::XMLMarkupRx

Constants included from Sanitizer

Sanitizer::CharRefRx, Sanitizer::InverseXMLSpecialChars, Sanitizer::InverseXMLSpecialCharsRx, Sanitizer::SanitizeXMLRx, Sanitizer::UnescapedAmpersandRx, Sanitizer::XMLSpecialChars, Sanitizer::XMLSpecialCharsRx

Constants included from Measurements

Measurements::InsetMeasurementValueRx, Measurements::MeasurementValueHintRx, Measurements::MeasurementValueRx

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Asciidoctor::Prawn::Extensions

#advance_page, #allocate_scratch_prototype, #arrange_block, #at_page_top?, #bounds_margin_left, #bounds_margin_right, #calc_line_metrics, #catalog, #column_box, #conceal_page_top, #delete_current_page, #dest_top, #draw_indented_formatted_line, #dry_run, #effective_page_height, #expand_grid_values, #expand_indent_value, #expand_padding_value, #expand_rect_values, #fill_absolute_bounds, #fill_and_stroke_bounds, #fill_bounds, #fill_formatted_text_box, #float, #flow_bounding_box, #font, #font_family, #font_info, #font_size, #font_style, #font_styles, #generate_margin_box, #get_dest, #hyphenate_text, #icon_font_data, #image_page, #import_page, #last_page?, #min_version, #move_down, #move_text_position, #move_up, #pad_box, #page_height, #page_margin, #page_margin_bottom, #page_margin_left, #page_margin_right, #page_margin_top, #page_side, #page_width, #parse_text, #perform_discretely, #perform_on_single_page, #recto_page?, #register_font, #resolve_font_style, #resolve_legacy_icon_name, #scratch, #scratch?, #set_font, #set_page_margin, #span_page_width_if, #start_new_page_discretely, #stop_if_first_page_empty, #stroke_horizontal_rule, #stroke_vertical_rule, #tare_first_page_content_stream, #text_with_formatted_first_line, #verso_page?, #width_of_string, #with_dry_run

Methods included from TextTransformer

#capitalize_words, #capitalize_words_pcdata, #hyphenate_words, #hyphenate_words_pcdata, #lowercase_pcdata, #smallcaps, #smallcaps_pcdata, #transform_text, #uppercase_pcdata

Methods included from Sanitizer

#encode_quotes, #escape_amp, #escape_xml, #sanitize, #unescape_xml

Methods included from Measurements

#resolve_measurement_values, #str_to_pt, #to_pt

Constructor Details

#initialize(backend, opts) ⇒ Converter

Returns a new instance of Converter.



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# File 'lib/asciidoctor/pdf/converter.rb', line 135

def initialize backend, opts
  super
  basebackend 'html'
  filetype 'pdf'
  htmlsyntax 'html'
  outfilesuffix '.pdf'
  if (doc = opts[:document])
    # NOTE: enabling data-uri forces Asciidoctor Diagram to produce absolute image paths
    doc.attributes['data-uri'] = (doc.instance_variable_get :@attribute_overrides)['data-uri'] = ''
  end
  @label = :primary
  @initial_instance_variables = [:@initial_instance_variables] + instance_variables
end

Instance Attribute Details

#allow_uri_read ⇒ Object (readonly)

Returns the value of attribute allow_uri_read.



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# File 'lib/asciidoctor/pdf/converter.rb', line 20

def allow_uri_read
  @allow_uri_read
end

#cache_uri ⇒ Object (readonly)

Returns the value of attribute cache_uri.



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# File 'lib/asciidoctor/pdf/converter.rb', line 22

def cache_uri
  @cache_uri
end

#font_color ⇒ Object

Returns the value of attribute font_color.



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# File 'lib/asciidoctor/pdf/converter.rb', line 26

def font_color
  @font_color
end

#font_scale ⇒ Object

Returns the value of attribute font_scale.



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# File 'lib/asciidoctor/pdf/converter.rb', line 28

def font_scale
  @font_scale
end

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/asciidoctor/pdf/converter.rb', line 30

def index
  @index
end

#jail_dir ⇒ Object (readonly)

Returns the value of attribute jail_dir.



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# File 'lib/asciidoctor/pdf/converter.rb', line 24

def jail_dir
  @jail_dir
end

#text_decoration_width ⇒ Object (readonly)

Returns the value of attribute text_decoration_width.



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# File 'lib/asciidoctor/pdf/converter.rb', line 34

def text_decoration_width
  @text_decoration_width
end

#theme ⇒ Object (readonly)

Returns the value of attribute theme.



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# File 'lib/asciidoctor/pdf/converter.rb', line 32

def theme
  @theme
end

Class Method Details

.method_added(method_sym) ⇒ Object

intercepts “class CustomPDFConverter < (Asciidoctor::Converter.for ‘pdf’)”



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# File 'lib/asciidoctor/pdf/converter.rb', line 4674

def self.method_added method_sym
  if (method_name = method_sym.to_s).start_with? 'layout_'
    alias_method %(ink_#{method_name.slice 7, method_name.length}).to_sym, method_sym
  elsif method_name == 'convert_listing_or_literal' || method_name == 'convert_code'
    alias_method :convert_listing, method_sym
    alias_method :convert_literal, method_sym
  end
end

.prepend(*mods) ⇒ Object

intercepts “(Asciidoctor::Converter.for ‘pdf’).prepend CustomConverterExtensions”



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# File 'lib/asciidoctor/pdf/converter.rb', line 4684

def self.prepend *mods
  super
  mods.each {|mod| (mod.instance_methods false).each {|method| method_added method } }
  self
end

Instance Method Details

#add_dest_for_block(node, id: nil, y: nil) ⇒ Object

If an id is provided or the node passed as the first argument has an id, add a named destination to the document equivalent to the node id at the current y position. If the node does not have an id and an id is not specified, do nothing.

If the node is a section, and the current y position is the top of the page, set the y position equal to the page height to improve the navigation experience. If the current x position is at or inside the left margin, set the x position equal to 0 (left edge of page) to improve the navigation experience.



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# File 'lib/asciidoctor/pdf/converter.rb', line 2741

def add_dest_for_block node, id: nil, y: nil
  if !scratch? && (id ||= node.id)
    dest_x = bounds.absolute_left.truncate 4
    # QUESTION: when content is aligned to left margin, should we keep precise x value or just use 0?
    dest_x = 0 if dest_x <= page_margin_left
    unless (dest_y = y)
      dest_y = @y
      dest_y += [page_height - dest_y, -@theme.block_anchor_top.to_f].min
    end
    # TODO: find a way to store only the ref of the destination; look it up when we need it
    node.set_attr 'pdf-destination', (node_dest = (dest_xyz dest_x, dest_y))
    add_dest id, node_dest
  end
  nil
end

#add_outline(doc, num_levels, toc_page_nums, num_front_matter_pages, has_front_cover) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2757

def add_outline doc, num_levels, toc_page_nums, num_front_matter_pages, has_front_cover
  if ::String === num_levels
    if num_levels.include? ':'
      num_levels, expand_levels = num_levels.split ':', 2
      num_levels = num_levels.empty? ? (doc.attr 'toclevels', 2).to_i : num_levels.to_i
      expand_levels = expand_levels.to_i
    else
      num_levels = expand_levels = num_levels.to_i
    end
  else
    expand_levels = num_levels
  end
  front_matter_counter = RomanNumeral.new 0, :lower
  pagenum_labels = {}

  num_front_matter_pages.times do |n|
    pagenum_labels[n] = { P: (::PDF::Core::LiteralString.new front_matter_counter.next!.to_s) }
  end

  # add labels for each content page, which is required for reader's page navigator to work correctly
  (num_front_matter_pages..(page_count - 1)).each_with_index do |n, i|
    pagenum_labels[n] = { P: (::PDF::Core::LiteralString.new (i + 1).to_s) }
  end

  unless toc_page_nums.none? || (toc_title = doc.attr 'toc-title').nil_or_empty?
    toc_section = insert_toc_section doc, toc_title, toc_page_nums
  end

  outline.define do
    initial_pagenum = has_front_cover ? 2 : 1
    # FIXME: use sanitize: :plain_text on Document#doctitle once available
    if document.page_count >= initial_pagenum && (outline_title = doc.attr 'outline-title') &&
        (outline_title.empty? ? (outline_title = document.resolve_doctitle doc) : outline_title)
      page title: (document.sanitize outline_title), destination: (document.dest_top initial_pagenum)
    end
    # QUESTION: is there any way to get add_outline_level to invoke in the context of the outline?
    document.add_outline_level self, doc.sections, num_levels, expand_levels
  end if doc.attr? 'outline'

  toc_section&.remove

  catalog.data[:PageLabels] = state.store.ref Nums: pagenum_labels.flatten
  primary_page_mode, secondary_page_mode = PageModes[(doc.attr 'pdf-page-mode') || @theme.page_mode]
  catalog.data[:PageMode] = primary_page_mode
  catalog.data[:NonFullScreenPageMode] = secondary_page_mode if secondary_page_mode
  nil
end

#add_outline_level(outline, sections, num_levels, expand_levels) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2805

def add_outline_level outline, sections, num_levels, expand_levels
  sections.each do |sect|
    next if (num_levels_for_sect = (sect.attr 'outlinelevels', num_levels).to_i) < (level = sect.level) ||
      ((sect.option? 'notitle') && sect == sect.document.last_child && sect.empty?)
    sect_title = sanitize sect.numbered_title formal: true
    sect_destination = sect.attr 'pdf-destination'
    if level < num_levels_for_sect && sect.sections?
      outline.section sect_title, destination: sect_destination, closed: expand_levels < 1 do
        add_outline_level outline, sect.sections, num_levels_for_sect, (expand_levels - 1)
      end
    else
      outline.page title: sect_title, destination: sect_destination
    end
  end
end

#allocate_running_content_layout(doc, page, periphery, cache) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 3324

def allocate_running_content_layout doc, page, periphery, cache
  cache[layout = page.layout] ||= begin
    page_margin_recto = @page_margin[layout][:recto]
    trim_margin_recto = @theme[%(#{periphery}_recto_margin)] || @theme[%(#{periphery}_margin)] || [0, 'inherit', 0, 'inherit']
    trim_margin_recto = (expand_margin_value trim_margin_recto).map.with_index {|v, i| i.odd? && v == 'inherit' ? page_margin_recto[i] : v.to_f }
    trim_content_margin_recto = @theme[%(#{periphery}_recto_content_margin)] || @theme[%(#{periphery}_content_margin)] || [0, 'inherit', 0, 'inherit']
    trim_content_margin_recto = (expand_margin_value trim_content_margin_recto).map.with_index {|v, i| i.odd? && v == 'inherit' ? page_margin_recto[i] - trim_margin_recto[i] : v.to_f }
    if (trim_padding_recto = @theme[%(#{periphery}_recto_padding)] || @theme[%(#{periphery}_padding)])
      trim_padding_recto = (expand_padding_value trim_padding_recto).map.with_index {|v, i| v + trim_content_margin_recto[i] }
    else
      trim_padding_recto = trim_content_margin_recto
    end
    page_margin_verso = @page_margin[layout][:verso]
    trim_margin_verso = @theme[%(#{periphery}_verso_margin)] || @theme[%(#{periphery}_margin)] || [0, 'inherit', 0, 'inherit']
    trim_margin_verso = (expand_margin_value trim_margin_verso).map.with_index {|v, i| i.odd? && v == 'inherit' ? page_margin_verso[i] : v.to_f }
    trim_content_margin_verso = @theme[%(#{periphery}_verso_content_margin)] || @theme[%(#{periphery}_content_margin)] || [0, 'inherit', 0, 'inherit']
    trim_content_margin_verso = (expand_margin_value trim_content_margin_verso).map.with_index {|v, i| i.odd? && v == 'inherit' ? page_margin_verso[i] - trim_margin_verso[i] : v.to_f }
    if (trim_padding_verso = @theme[%(#{periphery}_verso_padding)] || @theme[%(#{periphery}_padding)])
      trim_padding_verso = (expand_padding_value trim_padding_verso).map.with_index {|v, i| v + trim_content_margin_verso[i] }
    else
      trim_padding_verso = trim_content_margin_verso
    end
    valign, valign_offset = @theme[%(#{periphery}_vertical_align)]
    if (valign = valign&.to_sym || :middle) == :middle
      valign = :center
    end
    trim_styles = {
      line_metrics: (trim_line_metrics = calc_line_metrics @theme[%(#{periphery}_line_height)] || @base_line_height),
      # NOTE: we've already verified this property is set
      height: (trim_height = @theme[%(#{periphery}_height)]),
      bg_color: (resolve_theme_color %(#{periphery}_background_color).to_sym),
      border_width: (trim_border_width = @theme[%(#{periphery}_border_width)] || 0),
      border_color: trim_border_width > 0 ? (resolve_theme_color %(#{periphery}_border_color).to_sym, @theme.base_border_color) : nil,
      border_style: (@theme[%(#{periphery}_border_style)]&.to_sym || :solid),
      column_rule_width: (trim_column_rule_width = @theme[%(#{periphery}_column_rule_width)] || 0),
      column_rule_color: trim_column_rule_width > 0 ? (resolve_theme_color %(#{periphery}_column_rule_color).to_sym) : nil,
      column_rule_style: (@theme[%(#{periphery}_column_rule_style)]&.to_sym || :solid),
      column_rule_spacing: (@theme[%(#{periphery}_column_rule_spacing)] || 0),
      valign: valign_offset ? [valign, valign_offset] : valign,
      img_valign: @theme[%(#{periphery}_image_vertical_align)],
      top: {
        recto: periphery == :header ? page_height - trim_margin_recto[0] : trim_height + trim_margin_recto[2],
        verso: periphery == :header ? page_height - trim_margin_verso[0] : trim_height + trim_margin_verso[2],
      },
      left: {
        recto: (trim_left_recto = trim_margin_recto[3]),
        verso: (trim_left_verso = trim_margin_verso[3]),
      },
      width: {
        recto: (trim_width_recto = page_width - trim_left_recto - trim_margin_recto[1]),
        verso: (trim_width_verso = page_width - trim_left_verso - trim_margin_verso[1]),
      },
      padding: {
        recto: trim_padding_recto,
        verso: trim_padding_verso,
      },
      content_left: {
        recto: trim_left_recto + trim_padding_recto[3],
        verso: trim_left_verso + trim_padding_verso[3],
      },
      content_width: (trim_content_width = {
        recto: trim_width_recto - trim_padding_recto[1] - trim_padding_recto[3],
        verso: trim_width_verso - trim_padding_verso[1] - trim_padding_verso[3],
      }),
      content_height: (trim_content_height = {
        recto: trim_height - trim_padding_recto[0] - trim_padding_recto[2] - (trim_border_width * 0.5),
        verso: trim_height - trim_padding_verso[0] - trim_padding_verso[2] - (trim_border_width * 0.5),
      }),
      prose_content_height: {
        recto: trim_content_height[:recto] - trim_line_metrics.padding_top - trim_line_metrics.padding_bottom,
        verso: trim_content_height[:verso] - trim_line_metrics.padding_top - trim_line_metrics.padding_bottom,
      },
      # NOTE: content offset adjusts y position to account for border
      content_offset: (periphery == :footer ? trim_border_width * 0.5 : 0),
    }
    case trim_styles[:img_valign]
    when nil
      trim_styles[:img_valign] = valign
    when 'middle'
      trim_styles[:img_valign] = :center
    when 'top', 'center', 'bottom'
      trim_styles[:img_valign] = trim_styles[:img_valign].to_sym
    end

    if (trim_bg_image_recto = resolve_background_image doc, @theme, %(#{periphery}_background_image).to_sym, container_size: [trim_width_recto, trim_height])&.first
      trim_bg_image = { recto: trim_bg_image_recto }
      if trim_width_recto == trim_width_verso
        trim_bg_image[:verso] = trim_bg_image_recto
      else
        trim_bg_image[:verso] = resolve_background_image doc, @theme, %(#{periphery}_background_image).to_sym, container_size: [trim_width_verso, trim_height]
      end
    end

    colspec_dict = {}.tap do |acc|
      PageSides.each do |side|
        side_trim_content_width = trim_content_width[side]
        if (custom_colspecs = @theme[%(#{periphery}_#{side}_columns)] || @theme[%(#{periphery}_columns)])
          case (colspecs = (custom_colspecs.to_s.tr ',', ' ').split).size
          when 0, 1
            colspecs = { left: '0', center: colspecs[0] || '100', right: '0' }
          when 2
            colspecs = { left: colspecs[0], center: '0', right: colspecs[1] }
          else # 3
            colspecs = { left: colspecs[0], center: colspecs[1], right: colspecs[2] }
          end
          tot_width = 0
          side_colspecs = {}.tap do |accum|
            colspecs.each do |col, spec|
              if (alignment_char = spec.chr).to_i.to_s == alignment_char
                alignment = :left
                rel_width = spec.to_f
              else
                alignment = AlignmentTable[alignment_char]
                rel_width = (spec.slice 1, spec.length).to_f
              end
              tot_width += rel_width
              accum[col] = { align: alignment, width: rel_width, x: 0 }
            end
          end
          # QUESTION: should we allow the columns to overlap (capping width at 100%)?
          side_colspecs.each {|_, colspec| colspec[:width] = (colspec[:width] / tot_width) * side_trim_content_width }
          side_colspecs[:right][:x] = (side_colspecs[:center][:x] = side_colspecs[:left][:width]) + side_colspecs[:center][:width]
          acc[side] = side_colspecs
        else
          acc[side] = {
            left: { align: :left, width: side_trim_content_width, x: 0 },
            center: { align: :center, width: side_trim_content_width, x: 0 },
            right: { align: :right, width: side_trim_content_width, x: 0 },
          }
        end
      end
    end

    content_dict = {}.tap do |acc|
      PageSides.each do |side|
        side_content = {}
        ColumnPositions.each do |position|
          next if (val = @theme[%(#{periphery}_#{side}_#{position}_content)]).nil_or_empty?
          val = val.to_s unless ::String === val
          if (val.include? ':') && val =~ ImageAttributeValueRx
            attrlist = $2
            image_attrs = (::Asciidoctor::AttributeList.new attrlist).parse %w(alt width)
            image_path, image_format = ::Asciidoctor::Image.target_and_format $1, image_attrs
            image_path = apply_subs_discretely doc, image_path, subs: [:attributes], imagesdir: @themesdir
            if (image_path = resolve_image_path doc, image_path, image_format, @themesdir) && (::File.readable? image_path)
              image_opts = resolve_image_options image_path, image_format, image_attrs, container_size: [colspec_dict[side][position][:width], trim_content_height[side]]
              side_content[position] = [image_path, image_opts, image_attrs['link']]
            else
              # NOTE: allows inline image handler to report invalid reference and replace with alt text
              side_content[position] = %(image:#{image_path}[#{attrlist}])
            end
          else
            side_content[position] = val
          end
        end

        acc[side] = side_content
      end
    end

    if (trim_bg_color = trim_styles[:bg_color]) || trim_bg_image || trim_border_width > 0
      stamp_names = { recto: %(#{layout}_#{periphery}_recto), verso: %(#{layout}_#{periphery}_verso) }
      PageSides.each do |side|
        create_stamp stamp_names[side] do
          canvas do
            bounding_box [trim_styles[:left][side], trim_styles[:top][side]], width: trim_styles[:width][side], height: trim_height do
              fill_bounds trim_bg_color if trim_bg_color
              # NOTE: must draw line before image or SVG will cause border to disappear
              stroke_horizontal_rule trim_styles[:border_color], line_width: trim_border_width, line_style: trim_styles[:border_style], at: (periphery == :header ? bounds.height : 0) if trim_border_width > 0
              image trim_bg_image[side][0], ({ position: :center, vposition: :center }.merge trim_bg_image[side][1]) if trim_bg_image
            end
          end
        end
      end
    end

    [trim_styles, colspec_dict, content_dict, stamp_names]
  end
end

#allocate_toc(doc, toc_num_levels, toc_start_cursor, break_after_toc) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 3842

def allocate_toc doc, toc_num_levels, toc_start_cursor, break_after_toc
  toc_start_page_number = page_number
  to_page = nil
  extent = dry_run onto: self do
    to_page = (ink_toc doc, toc_num_levels, toc_start_page_number, toc_start_cursor).end
    theme_margin :block, :bottom unless break_after_toc
  end
  # NOTE: patch for custom converters that allocate extra TOC pages without actually creating them
  if to_page > extent.to.page
    extent.to.page = to_page
    extent.to.cursor = bounds.height
  end
  # NOTE: reserve pages for the toc; leaves cursor on page after last page in toc
  if break_after_toc
    extent.each_page { start_new_page }
  else
    extent.each_page {|first_page| start_new_page unless first_page }
    move_cursor_to extent.to.cursor
  end
  extent
end

#apply_subs_discretely(doc, value, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2821

def apply_subs_discretely doc, value, opts = {}
  if (imagesdir = opts[:imagesdir])
    imagesdir_to_restore = doc.attr 'imagesdir'
    doc.set_attr 'imagesdir', imagesdir
    remove_docimagesdir = doc.set_attr 'docimagesdir', (::File.absolute_path imagesdir_to_restore.to_s, (doc.attr 'docdir', '')), false
  end
  if (page_layout = opts[:page_layout])
    page_layout_to_restore = doc.attr 'page-layout'
    doc.set_attr 'page-layout', page.layout.to_s
  end
  # FIXME: get sub_attributes to handle drop-line w/o a warning
  doc.set_attr 'attribute-missing', 'skip' unless (attribute_missing = doc.attr 'attribute-missing') == 'skip'
  value = value.gsub '\{', '\\\\\\{' if (escaped_attr_ref = value.include? '\{')
  value = (subs = opts[:subs]) ? (doc.apply_subs value, subs) : (doc.apply_subs value)
  value = (value.split LF).delete_if {|line| SimpleAttributeRefRx.match? line }.join LF if opts[:drop_lines_with_unresolved_attributes] && (value.include? '{')
  value = value.gsub '\{', '{' if escaped_attr_ref
  doc.set_attr 'attribute-missing', attribute_missing unless attribute_missing == 'skip'
  page_layout_to_restore ? (doc.set_attr 'page-layout', page_layout_to_restore) : (doc.remove_attr 'page-layout') if page_layout
  if imagesdir
    imagesdir_to_restore ? (doc.set_attr 'imagesdir', imagesdir_to_restore) : (doc.remove_attr 'imagesdir')
    doc.remove_attr 'docimagesdir' if remove_docimagesdir
  end
  value
end

#arrange_heading(node, title, opts) ⇒ Object

Position the cursor for where to ink the specified section title or discrete heading node.

This method computes whether there’s enough room on the page to prevent the specified node from being orphaned. If there’s not enough room, the method will advance the cursor to the next page. This method is not called if the cursor is already at the top of the page or whether this node has no node that follows it in document order.



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# File 'lib/asciidoctor/pdf/converter.rb', line 2852

def arrange_heading node, title, opts
  if (min_height_after = @theme.heading_min_height_after) == 'auto' || (node.option? 'breakable')
    orphaned = nil
    doc = node.document
    dry_run single_page: true do
      push_scratch doc
      start_page = page
      theme_font :heading, level: opts[:level] do
        if opts[:part]
          ink_part_title node, title, opts
        elsif opts[:chapterlike]
          ink_chapter_title node, title, opts
        else
          ink_general_heading node, title, opts
        end
      end
      if page == start_page
        page.tare_content_stream
        orphaned = stop_if_first_page_empty { node.context == :section ? (traverse node) : (convert node.next_sibling) }
      end
    ensure
      pop_scratch doc
    end
    advance_page if orphaned
  else
    theme_font :heading, level: (hlevel = opts[:level]) do
      if (space_below = ::Numeric === min_height_after ? min_height_after : 0) > 0 && (node.context == :section ? node.blocks? : !node.last_child?)
        space_below += @theme[%(heading_h#{hlevel}_margin_bottom)] || @theme.heading_margin_bottom
      else
        space_below = 0
      end
      h_padding_t, h_padding_r, h_padding_b, h_padding_l = expand_padding_value @theme[%(heading_h#{hlevel}_padding)]
      h_fits = indent h_padding_l, h_padding_r do
        cursor >= (height_of_typeset_text title, inline_format: true, text_transform: @text_transform) +
          h_padding_t + h_padding_b + (@theme[%(heading_h#{hlevel}_margin_top)] || @theme.heading_margin_top) + space_below
      end
      advance_page unless h_fits
    end
  end
  nil
end

#build_pdf_info(doc) ⇒ Object

FIXME: Pdfmark should use the PDF info result



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# File 'lib/asciidoctor/pdf/converter.rb', line 514

def build_pdf_info doc
  info = {}
  if (doctitle = resolve_doctitle doc)
    info[:Title] = (sanitize doctitle).as_pdf
  end
  if (doc.attribute_locked? 'author') && !(doc.attribute_locked? 'authors')
    info[:Author] = (sanitize doc.attr 'author').as_pdf
  elsif doc.attr? 'authors'
    info[:Author] = (sanitize doc.attr 'authors').as_pdf
  elsif doc.attr? 'author' # rubocop:disable Lint/DuplicateBranch
    info[:Author] = (sanitize doc.attr 'author').as_pdf
  end
  info[:Subject] = (sanitize doc.attr 'subject').as_pdf if doc.attr? 'subject'
  info[:Keywords] = (sanitize doc.attr 'keywords').as_pdf if doc.attr? 'keywords'
  info[:Creator] = (doc.attr? 'publisher') ? (sanitize doc.attr 'publisher').as_pdf : (info[:Author] || '')
  info[:Producer] = (sanitize doc.attr 'producer').as_pdf if doc.attr? 'producer'
  if doc.attr? 'reproducible'
    info[:Producer] ||= 'Asciidoctor PDF, based on Prawn'.as_pdf
  else
    info[:Producer] ||= %(Asciidoctor PDF #{::Asciidoctor::PDF::VERSION}, based on Prawn #{::Prawn::VERSION}).as_pdf
    # NOTE: since we don't track the creation date of the input file, we map the ModDate header to the last modified
    # date of the input document and the CreationDate header to the date the PDF was produced by the converter.
    info[:ModDate] = (::Time.parse doc.attr 'docdatetime') rescue (now ||= ::Time.now)
    info[:CreationDate] = (::Time.parse doc.attr 'localdatetime') rescue (now || ::Time.now)
  end
  info
end

#build_pdf_options(doc, theme) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 453

def build_pdf_options doc, theme
  page_margin = resolve_page_margin (doc.attr 'pdf-page-margin') || theme.page_margin

  if (doc.attr? 'pdf-page-size') && PageSizeRx =~ (doc.attr 'pdf-page-size')
    # e.g, [8.5in, 11in]
    if $1
      page_size = [$1, $2]
    # e.g, 8.5in x 11in
    elsif $3
      page_size = [$3, $4]
    # e.g, A4
    else
      page_size = $&
    end
  else
    page_size = theme.page_size
  end

  case page_size
  when ::String, ::Symbol
    # TODO: extract helper method to check for named page size
    page_size = page_size.to_s.upcase
    page_size = nil unless ::PDF::Core::PageGeometry::SIZES.key? page_size
  when ::Array
    if page_size.empty?
      page_size = nil
    else
      page_size[1] ||= page_size[0]
      page_size = (page_size.slice 0, 2).map do |dim|
        if ::Numeric === dim
          # dimension cannot be less than 0
          dim > 0 ? dim : break
        elsif ::String === dim && MeasurementPartsRx =~ dim
          # NOTE: truncate to max precision retained by PDF::Core
          (dim = (to_pt $1.to_f, $2).truncate 4) > 0 ? dim : break
        else
          break
        end
      end
    end
  else
    page_size = nil
  end

  if (page_layout = (doc.attr 'pdf-page-layout') || theme.page_layout).nil_or_empty? ||
      !(PageLayouts.include? (page_layout = page_layout.to_sym))
    page_layout = nil
  end

  {
    margin: (page_margin || 36),
    page_size: (page_size || 'A4'),
    page_layout: (page_layout || :portrait),
    info: (build_pdf_info doc),
    compress: (doc.attr? 'compress'),
    skip_page_creation: true,
    text_formatter: (FormattedText::Formatter.new theme: theme),
  }
end

#convert(node, name = nil, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 149

def convert node, name = nil, _opts = {}
  method_name = %(convert_#{name ||= node.node_name})
  if respond_to? method_name
    result = send method_name, node
  else
    # TODO: delegate to convert_method_missing
    log :warn, %(missing convert handler for #{name} node in #{@backend} backend)
  end
  # NOTE: inline node handlers generate HTML-like strings; all other handlers write directly to the PDF object
  node.inline? ? result : self
end

#convert_abstract(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 789

def convert_abstract node
  add_dest_for_block node if node.id
  outdent_section do
    pad_box @theme.abstract_padding do
      theme_font :abstract_title do
        ink_prose node.title, align: (@theme.abstract_title_text_align || @base_text_align).to_sym, margin_top: @theme.heading_margin_top, margin_bottom: @theme.heading_margin_bottom, line_height: (@theme.heading_line_height || @theme.base_line_height)
      end if node.title?
      theme_font :abstract do
        prose_opts = { align: (@theme.abstract_text_align || @base_text_align).to_sym, hyphenate: true, margin_bottom: 0 }
        # FIXME: allow theme to control more first line options
        if (line1_font_style = @theme.abstract_first_line_font_style&.to_sym) && line1_font_style != font_style
          case line1_font_style
          when :normal
            first_line_options = { styles: [] }
          when :normal_italic
            first_line_options = { styles: [:italic] }
          else
            first_line_options = { styles: [font_style, line1_font_style] }
          end
        end
        if (line1_font_color = @theme.abstract_first_line_font_color)
          (first_line_options ||= {})[:color] = line1_font_color
        end
        if (line1_text_transform = @theme.abstract_first_line_text_transform)
          (first_line_options ||= {})[:text_transform] = line1_text_transform
        end
        prose_opts[:first_line_options] = first_line_options if first_line_options
        # FIXME: make this cleaner!!
        if node.blocks?
          node.blocks.each do |child|
            if child.context == :paragraph
              child.document.playback_attributes child.attributes
              convert_paragraph child, prose_opts.dup
              prose_opts.delete :first_line_options
            else
              # FIXME: this could do strange things if the wrong kind of content shows up
              child.convert
            end
          end
        elsif node.content_model != :compound && (string = node.content)
          if (text_align = resolve_text_align_from_role node.roles)
            prose_opts[:align] = text_align
          end
          if IndentableTextAlignments[prose_opts[:align]] && (text_indent = @theme.prose_text_indent) > 0
            prose_opts[:indent_paragraphs] = text_indent
          end
          ink_prose string, prose_opts
        end
      end
    end
  end
  # NOTE: next enclosed block here is confined to preamble
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_admonition(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 884

def convert_admonition node
  type = node.attr 'name'
  label_text_align = @theme.admonition_label_text_align&.to_sym || :center
  # TODO: allow vertical_align to be a number
  if (label_valign = @theme.admonition_label_vertical_align&.to_sym || :middle) == :middle
    label_valign = :center
  end
  if (label_min_width = @theme.admonition_label_min_width)
    label_min_width = label_min_width.to_f
  end
  if (doc = node.document).attr? 'icons'
    if !(has_icon = node.attr? 'icon') && (doc.attr 'icons') == 'font'
      icons = 'font'
      icon_data = admonition_icon_data type.to_sym
      icon_size = icon_data[:size] || 24
      label_width = label_min_width || (icon_size * 1.5)
    elsif (icon_path = has_icon || !(icon_path = (@theme[%(admonition_icon_#{type})] || {})[:image]) ?
        (get_icon_image_path node, type) :
        (ThemeLoader.resolve_theme_asset (apply_subs_discretely doc, icon_path, subs: [:attributes], imagesdir: @themesdir), @themesdir)) &&
        (::File.readable? icon_path)
      icons = true
      # TODO: introduce @theme.admonition_image_width? or use size key from admonition_icon_<name>?
      label_width = label_min_width || 36.0
    else
      log :warn, %(admonition icon image#{has_icon ? '' : ' for ' + type.upcase} not found or not readable: #{icon_path || (get_icon_image_path node, type, false)})
    end
  end
  unless icons
    label_text = sanitize node.caption
    theme_font_cascade [:admonition_label, %(admonition_label_#{type})] do
      label_text = transform_text label_text, @text_transform if @text_transform
      label_width = rendered_width_of_string label_text
      label_width = label_min_width if label_min_width && label_min_width > label_width
    end
  end
  cpad = expand_padding_value @theme.admonition_padding
  lpad = (lpad = @theme.admonition_label_padding) ? (expand_padding_value lpad) : cpad
  arrange_block node do |extent|
    add_dest_for_block node if node.id
    theme_fill_and_stroke_block :admonition, extent if extent
    pad_box [0, cpad[1], 0, lpad[3]] do
      if extent
        label_height = extent.single_page_height || cursor
        if (rule_width = @theme.admonition_column_rule_width || 0) > 0 &&
            (rule_color = resolve_theme_color :admonition_column_rule_color, @theme.base_border_color, nil)
          rule_style = @theme.admonition_column_rule_style&.to_sym || :solid
          float do
            extent.each_page do |first_page, last_page|
              advance_page unless first_page
              rule_segment_height = start_cursor = cursor
              rule_segment_height -= last_page.cursor if last_page
              bounding_box [bounds.left, start_cursor], width: label_width + lpad[1], height: rule_segment_height do
                stroke_vertical_rule rule_color, at: bounds.right, line_style: rule_style, line_width: rule_width
              end
            end
          end
        end
        float do
          adjusted_font_size = nil
          bounding_box [bounds.left, cursor], width: label_width, height: label_height do
            if icons == 'font'
              # FIXME: we assume icon is square
              icon_size = fit_icon_to_bounds icon_size
              # NOTE: Prawn's vertical center is not reliable, so calculate it manually
              if label_valign == :center
                label_valign = :top
                if (vcenter_pos = (label_height - icon_size) * 0.5) > 0
                  move_down vcenter_pos
                end
              end
              icon icon_data[:name],
                valign: label_valign,
                align: label_text_align,
                color: (icon_data[:stroke_color] || font_color),
                size: icon_size
            elsif icons
              if (::Asciidoctor::Image.format icon_path) == 'svg'
                begin
                  svg_obj = ::Prawn::SVG::Interface.new (::File.read icon_path, mode: 'r:UTF-8'), self,
                    position: label_text_align,
                    vposition: label_valign,
                    width: label_width,
                    height: label_height,
                    fallback_font_name: fallback_svg_font_name,
                    enable_web_requests: allow_uri_read ? (method :load_open_uri).to_proc : false,
                    enable_file_requests_with_root: { base: (::File.dirname icon_path), root: @jail_dir },
                    cache_images: cache_uri
                  svg_obj.resize height: label_height if svg_obj.document.sizing.output_height > label_height
                  svg_obj.draw
                  svg_obj.document.warnings.each do |icon_warning|
                    log :warn, %(problem encountered in image: #{icon_path}; #{icon_warning})
                  end unless scratch?
                rescue
                  log :warn, %(could not embed admonition icon image: #{icon_path}; #{$!.message})
                  icons = nil
                end
              else
                begin
                  image_obj, image_info = ::File.open(icon_path, 'rb') {|fd| build_image_object fd }
                  icon_aspect_ratio = image_info.width.fdiv image_info.height
                  # NOTE: don't scale image up if smaller than label_width
                  icon_width = [(to_pt image_info.width, :px), label_width].min
                  if (icon_height = icon_width * (1 / icon_aspect_ratio)) > label_height
                    icon_width *= label_height / icon_height
                  end
                  embed_image image_obj, image_info, width: icon_width, position: label_text_align, vposition: label_valign
                rescue
                  log :warn, %(could not embed admonition icon image: #{icon_path}; #{$!.message})
                  icons = nil
                end
              end
              unless icons
                label_text = sanitize node.caption
                theme_font_cascade [:admonition_label, %(admonition_label_#{type})] do
                  label_text = transform_text label_text, @text_transform if @text_transform
                  # NOTE: make sure the textual label fits in space already reserved
                  if (actual_label_width = rendered_width_of_string label_text) > label_width
                    adjusted_font_size = font_size * label_width / actual_label_width
                  end
                end
                redo
              end
            else
              # NOTE: the label must fit in the alotted space or it shows up on another page!
              # QUESTION: anyway to prevent text overflow in the case it doesn't fit?
              theme_font_cascade [:admonition_label, %(admonition_label_#{type})] do
                font_size adjusted_font_size if adjusted_font_size
                # NOTE: Prawn's vertical center is not reliable, so calculate it manually
                if label_valign == :center
                  label_valign = :top
                  if (vcenter_pos = (label_height - (height_of_typeset_text label_text, line_height: 1)) * 0.5) > 0
                    move_down vcenter_pos
                  end
                end
                @text_transform = nil # already applied to label
                ink_prose label_text,
                  align: label_text_align,
                  valign: label_valign,
                  line_height: 1,
                  margin: 0,
                  inline_format: false, # already replaced character references
                  overflow: :shrink_to_fit,
                  disable_wrap_by_char: true
              end
            end
          end
        end
      end
      pad_box [cpad[0], 0, cpad[2], label_width + lpad[1] + cpad[3]], node do
        ink_caption node, category: :admonition, labeled: false if node.title?
        theme_font :admonition do
          traverse node
        end
      end
    end
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_audio(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1894

def convert_audio node
  add_dest_for_block node if node.id
  audio_path = node.media_uri node.attr 'target'
  play_symbol = (node.document.attr? 'icons', 'font') ? %(<font name="fas">#{(icon_font_data 'fas').unicode 'play'}</font>) : RightPointer
  ink_prose %(#{play_symbol}#{NoBreakSpace}<a href="#{audio_path}">#{audio_path}</a> <em>(audio)</em>), normalize: false, margin: 0
  ink_caption node, labeled: false, end: :bottom if node.title?
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_code(node) ⇒ Object Also known as: convert_listing, convert_literal, convert_listing_or_literal

QUESTION: can we avoid arranging fragments multiple times (conums & autofit) by eagerly preparing arranger?



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# File 'lib/asciidoctor/pdf/converter.rb', line 1044

def convert_code node
  extensions = []
  source_chunks = bg_color_override = font_color_override = adjusted_font_size = nil
  theme_font :code do
    # HACK: disable built-in syntax highlighter; must be done before calling node.content!
    if node.style == 'source' && (highlighter = (syntax_hl = node.document.syntax_highlighter)&.highlight? && syntax_hl.name)
      case highlighter
      when 'coderay'
        Helpers.require_library CodeRayRequirePath, 'coderay' unless defined? ::Asciidoctor::Prawn::CodeRayEncoder
      when 'pygments'
        Helpers.require_library PygmentsRequirePath, 'pygments.rb' unless defined? ::Pygments::Ext::BlockStyles
      when 'rouge'
        Helpers.require_library RougeRequirePath, 'rouge' unless defined? ::Rouge::Formatters::Prawn
      else
        highlighter = nil
      end
      saved_subs = (subs = node.subs).drop 0
      callouts_enabled = subs.include? :callouts
      highlight_idx = subs.index :highlight
      # NOTE: scratch? here only applies if listing block is nested inside another block
      if !highlighter || scratch?
        highlighter = nil
        if highlight_idx
          # switch the :highlight sub back to :specialcharacters
          subs[highlight_idx] = :specialcharacters
        else
          saved_subs = nil
        end
        source_string = guard_indentation node.content
      elsif highlight_idx
        # NOTE: the source highlighter logic below handles the highlight and callouts subs
        if (subs - [:highlight, :callouts]).empty?
          subs.clear
          # NOTE: indentation guards will be added by the source highlighter logic
          source_string = expand_tabs node.content
        else
          if callouts_enabled
            saved_lines = node.lines.drop 0
            subs.delete :callouts
            prev_subs = subs.drop 0
            subs.clear
            source_string, conum_mapping = extract_conums node.content
            node.lines.replace (source_string.split LF)
            subs.replace prev_subs
            callouts_enabled = false
          end
          subs[highlight_idx] = :specialcharacters
          source_string = node.content || ''
          # NOTE: indentation guards will be added by the source highlighter logic
          source_string = expand_tabs unescape_xml (sanitize source_string, compact: false) unless source_string.empty?
          node.lines.replace saved_lines if saved_lines
        end
      else
        highlighter = saved_subs = nil
        source_string = guard_indentation node.content
      end
    else
      highlighter = nil
      source_string = guard_indentation node.content
    end

    case highlighter
    when 'coderay'
      source_string, conum_mapping = extract_conums source_string if callouts_enabled
      srclang = node.attr 'language', 'text'
      begin
        ::CodeRay::Scanners[(srclang = (srclang.start_with? 'html+') ? (srclang.slice 5, srclang.length).to_sym : srclang.to_sym)]
      rescue
        until ::LoadError === (cause ||= $!) || ::ArgumentError === cause
          raise $! unless (cause = cause.cause)
        end
        srclang = :text
      end
      fragments = (::CodeRay.scan source_string, srclang).to_prawn
      source_chunks = conum_mapping ? (restore_conums fragments, conum_mapping) : fragments
    when 'pygments'
      unless (style = (node.document.attr 'pygments-style')) && (::Pygments::Ext::BlockStyles.available? style)
        style = 'pastie'
      end
      # QUESTION: allow border color to be set by theme for highlighted block?
      pg_block_styles = ::Pygments::Ext::BlockStyles.for style
      bg_color_override = pg_block_styles[:background_color]
      font_color_override = pg_block_styles[:font_color]
      if source_string.empty?
        source_chunks = []
      else
        lexer = (::Pygments::Lexer.find_by_alias node.attr 'language', 'text') || (::Pygments::Lexer.find_by_mimetype 'text/plain')
        lexer_opts = { nowrap: true, noclasses: true, stripnl: false, style: style }
        lexer_opts[:startinline] = !(node.option? 'mixed') if lexer.name == 'PHP'
        source_string, conum_mapping = extract_conums source_string if callouts_enabled
        # NOTE: highlight can return nil if something goes wrong; fallback to encoded source string if this happens
        result = (lexer.highlight source_string, options: lexer_opts) || (node.apply_subs source_string, [:specialcharacters])
        if node.attr? 'highlight'
          if (highlight_lines = node.resolve_lines_to_highlight source_string, (node.attr 'highlight')).empty?
            highlight_lines = nil
          else
            pg_highlight_bg_color = pg_block_styles[:highlight_background_color]
            highlight_lines = {}.tap {|accum| highlight_lines.each {|linenum| accum[linenum] = pg_highlight_bg_color } }
          end
        end
        if (node.option? 'linenums') || (node.attr? 'linenums')
          linenums = (node.attr 'start', 1).to_i
          postprocess = true
          extensions << FormattedText::SourceWrap
        elsif conum_mapping || highlight_lines
          postprocess = true
        end
        fragments = text_formatter.format result
        fragments = restore_conums fragments, conum_mapping, linenums, highlight_lines if postprocess
        source_chunks = guard_indentation_in_fragments fragments
      end
    when 'rouge'
      formatter = (@rouge_formatter ||= ::Rouge::Formatters::Prawn.new theme: (node.document.attr 'rouge-style'), line_gap: @theme.code_line_gap, highlight_background_color: @theme.code_highlight_background_color)
      # QUESTION: allow border color to be set by theme for highlighted block?
      bg_color_override = formatter.background_color
      if source_string.empty?
        source_chunks = []
      else
        if (node.option? 'linenums') || (node.attr? 'linenums')
          formatter_opts = { line_numbers: true, start_line: (node.attr 'start', 1).to_i }
          extensions << FormattedText::SourceWrap
        else
          formatter_opts = {}
        end
        if (srclang = node.attr 'language')
          if srclang.include? '?'
            if (lexer = ::Rouge::Lexer.find_fancy srclang)&.tag == 'php' && !(node.option? 'mixed') && !((lexer_opts = lexer.options).key? 'start_inline')
              lexer = lexer.class.new lexer_opts.merge 'start_inline' => true
            end
          elsif (lexer = ::Rouge::Lexer.find srclang)&.tag == 'php' && !(node.option? 'mixed')
            lexer = lexer.new start_inline: true
          end
        end
        lexer ||= ::Rouge::Lexers::PlainText
        source_string, conum_mapping = extract_conums source_string if callouts_enabled
        if (node.attr? 'highlight') && !(hl_lines = (node.resolve_lines_to_highlight source_string, (node.attr 'highlight'))).empty?
          formatter_opts[:highlight_lines] = {}.tap {|accum| hl_lines.each {|linenum| accum[linenum] = true } }
        end
        fragments = formatter.format (lexer.lex source_string), formatter_opts rescue [text: source_string]
        source_chunks = conum_mapping ? (restore_conums fragments, conum_mapping) : fragments
      end
    else
      # NOTE: only format if we detect a need (callouts or inline formatting)
      source_chunks = (XMLMarkupRx.match? source_string) ? (text_formatter.format source_string) : [text: source_string]
    end
    node.subs.replace saved_subs if saved_subs
    adjusted_font_size = ((node.option? 'autofit') || (node.document.attr? 'autofit-option')) ? (compute_autofit_font_size source_chunks, :code) : nil
  end

  caption_below = @theme.code_caption_end&.to_sym == :bottom
  arrange_block node do |extent|
    add_dest_for_block node if node.id
    tare_first_page_content_stream do
      theme_fill_and_stroke_block :code, extent, background_color: bg_color_override, caption_node: caption_below ? nil : node
    end
    pad_box @theme.code_padding, node do
      theme_font :code do
        typeset_formatted_text source_chunks, (calc_line_metrics @base_line_height),
          color: (font_color_override || @theme.code_font_color || @font_color),
          size: adjusted_font_size,
          bottom_gutter: @bottom_gutters[-1][node],
          extensions: extensions.empty? ? nil : extensions
      end
    end
  end
  # TODO: add protection against the bottom caption being widowed
  ink_caption node, category: :code, end: :bottom if caption_below
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_colist(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1353

def convert_colist node
  if !at_page_top? && ((prev_context = node.previous_sibling&.context) == :listing || prev_context == :literal)
    margin_top @theme.callout_list_margin_top_after_code
  end
  add_dest_for_block node if node.id
  @list_numerals << 1
  last_item = node.items[-1]
  item_spacing = @theme.callout_list_item_spacing || @theme.list_item_spacing
  item_opts = { margin_bottom: item_spacing, normalize_line_height: true }
  if (item_text_align = (resolve_text_align_from_role node.roles) || @theme.list_text_align&.to_sym)
    item_opts[:align] = item_text_align
  end
  theme_font :callout_list do
    line_metrics = theme_font(:conum) { calc_line_metrics @base_line_height }
    node.items.each do |item|
      allocate_space_for_list_item line_metrics
      item_opts[:margin_bottom] = 0 if item == last_item
      convert_colist_item item, item_opts
    end
  end
  @list_numerals.pop
  theme_margin :prose, :bottom, (next_enclosed_block node)
end

#convert_colist_item(node, opts) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1377

def convert_colist_item node, opts
  marker_width = nil
  @list_numerals << (index = @list_numerals.pop).next
  theme_font :conum do
    marker_width = rendered_width_of_string %(#{marker = conum_glyph index}x)
    marker_font_color = @theme.callout_list_marker_font_color || @font_color
    float do
      bounding_box [bounds.left, cursor], width: marker_width do
        ink_prose marker, align: :center, inline_format: false, margin: 0, color: marker_font_color
      end
    end
  end

  indent marker_width do
    traverse_list_item node, :colist, opts
  end
end

#convert_collapsible(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1218

def convert_collapsible node
  id = node.id
  title = (collapsible_marker = %(\u25bc )) + (node.title? ? node.title : 'Details')
  indent_by = theme_font(:caption) { rendered_width_of_string collapsible_marker }
  if !at_page_top? && (id || (node.option? 'unbreakable'))
    arrange_block node do
      add_dest_for_block node if id
      tare_first_page_content_stream { ink_caption title }
      indent(indent_by) { traverse node }
    end
  else
    add_dest_for_block node if id
    tare_first_page_content_stream { ink_caption title }
    indent(indent_by) { traverse node }
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_dlist(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1395

def convert_dlist node
  add_dest_for_block node if node.id

  case (style = node.style)
  when 'unordered', 'ordered'
    if style == 'unordered'
      list_style = :ulist
      (markers = @list_bullets) << :disc
    else
      list_style = :olist
      (markers = @list_numerals) << 1
    end
    list = List.new node.parent, list_style
    stack_subject = node.has_role? 'stack'
    subject_stop = node.attr 'subject-stop', (stack_subject ? nil : ':')
    node.items.each do |subjects, dd|
      subject = (Array subjects).first.text
      if dd
        list_item_text = %(+++<strong>#{subject}#{(StopPunctRx.match? sanitize subject) ? '' : subject_stop}</strong>#{dd.text? ? "#{stack_subject ? '<br>' : ' '}#{dd.text}" : ''}+++)
        list_item = ListItem.new list, list_item_text
        dd.blocks.each {|it| list_item << it } if dd.blocks?
      else
        list_item = ListItem.new list, %(+++<strong>#{subject}</strong>+++)
      end
      list << list_item
    end
    convert_list list
    markers.pop
  when 'horizontal'
    table_data = []
    term_padding = term_padding_no_blocks = term_font_color = term_transform = desc_padding = term_line_metrics = term_inline_format = term_kerning = nil
    max_term_width = 0
    theme_font :description_list_term do
      term_font_color = @font_color
      term_transform = @text_transform
      term_inline_format = (term_font_styles = font_styles).empty? ? true : [inherited: { styles: term_font_styles }]
      term_line_metrics = calc_line_metrics @base_line_height
      term_padding_no_blocks = [term_line_metrics.padding_top, 10, term_line_metrics.padding_bottom, 10]
      (term_padding = (term_padding_no_blocks.drop 0))[2] += @theme.prose_margin_bottom * 0.5
      desc_padding = [0, 10, 0, 10]
      term_kerning = default_kerning?
    end
    actual_node, node = node, node.dup
    (node.instance_variable_set :@blocks, node.items.map(&:dup)).each do |item|
      terms, desc = item
      term_text = terms.map(&:text).join ?\n
      term_text = transform_text term_text, term_transform if term_transform
      if (term_width = width_of term_text, inline_format: term_inline_format, kerning: term_kerning) > max_term_width
        max_term_width = term_width
      end
      row_data = [{
        text_color: term_font_color,
        kerning: term_kerning,
        content: term_text,
        inline_format: term_inline_format,
        padding: desc&.blocks? ? term_padding : term_padding_no_blocks,
        leading: term_line_metrics.leading,
        # FIXME: prawn-table doesn't have support for final_gap option
        #final_gap: term_line_metrics.final_gap,
        valign: :top,
      }]
      if desc
        desc_container = Block.new node, :open
        desc_container << (Block.new desc_container, :paragraph, source: (desc.instance_variable_get :@text), subs: :default) if desc.text?
        desc.blocks.each {|b| desc_container << b.dup } if desc.blocks?
        row_data << { content: (::Prawn::Table::Cell::AsciiDoc.new self, content: (item[1] = desc_container), text_color: @font_color, padding: desc_padding, valign: :top, source_location: desc.source_location) }
      else
        row_data << {}
      end
      table_data << row_data
    end
    max_term_width += (term_padding[1] + term_padding[3])
    term_column_width = [max_term_width, bounds.width * 0.5].min
    table table_data, position: :left, column_widths: [term_column_width] do
      cells.style border_width: 0
      @pdf.ink_table_caption node if node.title?
    end
    theme_margin :prose, :bottom, (next_enclosed_block actual_node) #unless actual_node.nested?
  when 'qanda'
    @list_numerals << 1
    convert_list node
    @list_numerals.pop
  else
    # TODO: check if we're within one line of the bottom of the page
    # and advance to the next page if so (similar to logic for section titles)
    ink_caption node, category: :description_list, labeled: false if node.title?

    term_spacing = @theme.description_list_term_spacing
    term_height = theme_font(:description_list_term) { height_of_typeset_text 'A' }
    prose_height = height_of_typeset_text 'A'
    node.items.each do |terms, desc|
      advance_page if !at_page_top? && cursor < (nlines = terms.size + (desc && desc.text? ? 1 : 0)) * term_height + (nlines - 1) * term_spacing + (desc && !desc.text? && desc.blocks? ? term_spacing + prose_height : 0)
      theme_font :description_list_term do
        if (term_font_styles = font_styles).empty?
          term_font_styles = nil
        end
        terms.each_with_index do |term, idx|
          # QUESTION: should we pass down styles in other calls to ink_prose
          ink_prose term.text, margin_top: (idx > 0 ? term_spacing : 0), margin_bottom: 0, align: :left, normalize_line_height: true, styles: term_font_styles
        end
      end
      indent @theme.description_list_description_indent do
        #margin_bottom (desc.simple? ? @theme.list_item_spacing : term_spacing)
        margin_bottom term_spacing
        traverse_list_item desc, :dlist_desc, normalize_line_height: true, margin_bottom: ((next_enclosed_block desc, descend: true) ? nil : 0)
      end if desc
    end
    theme_margin :prose, :bottom, (next_enclosed_block node) unless node.nested?
  end
end

#convert_document(doc) ⇒ Object Also known as: convert_embedded 



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# File 'lib/asciidoctor/pdf/converter.rb', line 161

def convert_document doc
  doc.promote_preface_block
  init_pdf doc
  # set default value for outline, outline-title, and pagenums attributes if not otherwise set
  doc.attributes['outline'] = '' if doc.attr_unspecified? 'outline'
  doc.attributes['outline-title'] = '' if doc.attr_unspecified? 'outline-title'
  doc.attributes['pagenums'] = '' if doc.attr_unspecified? 'pagenums'

  # NOTE: & prefix required here to pass resolved method as block of on_page_create method
  on_page_create(&(method :init_page).curry[doc])

  marked_page_number = page_number
  # NOTE: a new page will already be started (page_number = 2) if the front cover image is a PDF
  ink_cover_page doc, :front
  has_front_cover = page_number > marked_page_number
  doctype = doc.doctype
  if (has_title_page = (title_as_page = doctype == 'book' || (doc.attr? 'title-page')) && (start_title_page doc))
    # NOTE: the base font must be set before any content is written to the main or scratch document
    font @theme.base_font_family, size: @root_font_size, style: @theme.base_font_style
    if perform_on_single_page { ink_title_page doc }
      log :warn, 'the title page contents has been truncated to prevent it from overrunning the bounds of a single page'
    end
    start_new_page
  else
    @page_margin[:cover] = @page_margin[page.layout][:recto] if @media == 'prepress' && page_number == 0
    start_new_page unless page&.empty? # rubocop:disable Lint/SafeNavigationWithEmpty
    # NOTE: the base font must be set before any content is written to the main or scratch document
    # this method is called inside ink_title_page if the title page is active
    font @theme.base_font_family, size: @root_font_size, style: @theme.base_font_style
  end

  unless title_as_page
    body_start_page_number = page_number
    theme_font :heading, level: 1 do
      ink_general_heading doc, doc.doctitle, align: (@theme.heading_h1_text_align&.to_sym || :center), level: 1, role: :doctitle
    end if doc.header? && !doc.notitle
  end

  num_front_matter_pages = toc_page_nums = toc_num_levels = nil

  indent_section do
    toc_num_levels = (doc.attr 'toclevels', 2).to_i
    if (toc_at_top = (doc.attr? 'toc') && !((toc_placement = doc.attr 'toc-placement') == 'macro' || toc_placement == 'preamble') && !(get_entries_for_toc doc).empty?)
      start_new_page if @ppbook && verso_page?
      add_dest_for_block doc, id: 'toc', y: (at_page_top? ? page_height : nil)
      @toc_extent = allocate_toc doc, toc_num_levels, cursor, (title_as_page && theme.toc_break_after != 'auto')
    else
      @toc_extent = nil
    end

    if @ppbook && verso_page? && !(((next_block = doc.first_child)&.context == :preamble ? next_block.first_child : next_block)&.option? 'nonfacing')
      min_start_at = 0
      start_new_page
    else
      min_start_at = 1
    end

    if title_as_page
      zero_page_offset = has_front_cover ? 1 : 0
      first_page_offset = has_title_page ? zero_page_offset.next : zero_page_offset
      body_offset = (body_start_page_number = page_number) - 1
      if ::Integer === (running_content_start_at = @theme.running_content_start_at)
        running_content_body_offset = body_offset + [running_content_start_at.pred, min_start_at.pred].max
        running_content_start_at = 'body'
      else
        running_content_body_offset = body_offset
        case running_content_start_at
        when 'title'
          running_content_start_at = 'toc' unless has_title_page
        when 'toc'
          uses_start_at_toc = true
          running_content_start_at = 'body' unless toc_at_top
        when 'after-toc'
          uses_start_at_after_toc = true
          running_content_start_at = 'body'
        end
      end
      if ::Integer === (page_numbering_start_at = @theme.page_numbering_start_at)
        page_numbering_body_offset = body_offset + [page_numbering_start_at.pred, min_start_at.pred].max
        page_numbering_start_at = 'body'
      else
        page_numbering_body_offset = body_offset
        case page_numbering_start_at
        when 'cover'
          if has_front_cover
            page_numbering_body_offset = 0
          else
            page_numbering_start_at = 'title'
          end
        when 'title'
          page_numbering_start_at = 'toc' unless has_title_page
        when 'toc'
          uses_start_at_toc = true
          page_numbering_start_at = 'body' unless toc_at_top
        when 'after-toc'
          uses_start_at_after_toc = true
          page_numbering_start_at = 'body'
        end
      end
      # table values are number of pages to skip before starting running content and page numbering, respectively
      num_front_matter_pages = {
        %w(title cover) => [zero_page_offset, page_numbering_body_offset],
        %w(title title) => [zero_page_offset, zero_page_offset],
        %w(title toc) => [zero_page_offset, first_page_offset],
        %w(title body) => [zero_page_offset, page_numbering_body_offset],
        %w(toc cover) => [first_page_offset, page_numbering_body_offset],
        %w(toc title) => [first_page_offset, zero_page_offset],
        %w(toc toc) => [first_page_offset, first_page_offset],
        %w(toc body) => [first_page_offset, page_numbering_body_offset],
        %w(body cover) => [running_content_body_offset, page_numbering_body_offset],
        %w(body title) => [running_content_body_offset, zero_page_offset],
        %w(body toc) => [running_content_body_offset, first_page_offset],
      }[[running_content_start_at, page_numbering_start_at]] || [running_content_body_offset, page_numbering_body_offset]
    else
      body_offset = body_start_page_number - 1
      if ::Integer === (running_content_start_at = @theme.running_content_start_at)
        running_content_body_offset = body_offset + [running_content_start_at.pred, 0].max
      else
        running_content_body_offset = body_offset
      end
      if ::Integer === (page_numbering_start_at = @theme.page_numbering_start_at)
        page_numbering_body_offset = body_offset + [page_numbering_start_at.pred, 0].max
      elsif page_numbering_start_at == 'cover' && has_front_cover
        page_numbering_body_offset = 0
      else
        page_numbering_body_offset = body_offset
      end
      num_front_matter_pages = [running_content_body_offset, page_numbering_body_offset]
    end

    @index.start_page_number = num_front_matter_pages[1] + 1
    doc.set_attr 'pdf-anchor', (derive_anchor_from_id doc.id, 'top')
    doc.set_attr 'pdf-page-start', page_number

    if doctype == 'book' || (columns = @theme.page_columns || 1) < 2
      convert_section generate_manname_section doc if doctype == 'manpage' && (doc.attr? 'manpurpose')
      traverse doc
      # NOTE: for a book, these are leftover footnotes; for an article this is everything
      outdent_section { ink_footnotes doc }
    else
      column_box [bounds.left, cursor], columns: columns, width: bounds.width, reflow_margins: true, spacer: @theme.page_column_gap do
        convert_section generate_manname_section doc if doctype == 'manpage' && (doc.attr? 'manpurpose')
        traverse doc
        # NOTE: for a book, these are leftover footnotes; for an article this is everything
        outdent_section { ink_footnotes doc }
      end
    end

    if (toc_extent = @toc_extent)
      if title_as_page && !toc_at_top && (uses_start_at_toc || uses_start_at_after_toc)
        if uses_start_at_toc
          toc_offset = toc_extent.from.page - 1
          num_front_matter_pages[0] = toc_offset if @theme.running_content_start_at == 'toc'
          num_front_matter_pages[1] = toc_offset if @theme.page_numbering_start_at == 'toc'
        end
        if uses_start_at_after_toc
          after_toc_offset = toc_extent.to.page
          after_toc_offset += 1 if @ppbook && (recto_page? after_toc_offset)
          num_front_matter_pages[0] = after_toc_offset if @theme.running_content_start_at == 'after-toc'
          num_front_matter_pages[1] = after_toc_offset if @theme.page_numbering_start_at == 'after-toc'
        end
      end
      toc_page_nums = ink_toc doc, toc_num_levels, toc_extent.from.page, toc_extent.from.cursor, num_front_matter_pages[1]
    else
      toc_page_nums = []
    end

    # NOTE: delete orphaned page (a page was created but there was no additional content)
    # QUESTION: should we delete page if document is empty? (leaving no pages?)
    delete_current_page if page_count > 1 && page.empty?
  end

  unless page_count < body_start_page_number
    ink_running_content :header, doc, num_front_matter_pages, body_start_page_number unless doc.noheader || @theme.header_height.to_f == 0 # rubocop:disable Lint/FloatComparison
    ink_running_content :footer, doc, num_front_matter_pages, body_start_page_number unless doc.nofooter || @theme.footer_height.to_f == 0 # rubocop:disable Lint/FloatComparison
  end

  add_outline doc, (doc.attr 'outlinelevels', toc_num_levels), toc_page_nums, num_front_matter_pages[1], has_front_cover
  if (initial_zoom = @theme.page_initial_zoom&.to_sym)
    case initial_zoom
    when :Fit
      catalog.data[:OpenAction] = dest_fit state.pages[0]
    when :FitV
      catalog.data[:OpenAction] = dest_fit_vertically 0, state.pages[0]
    when :FitH
      catalog.data[:OpenAction] = dest_fit_horizontally page_height, state.pages[0]
    end
  end
  catalog.data[:ViewerPreferences] = { DisplayDocTitle: true }

  stamp_foreground_image doc, has_front_cover
  ink_cover_page doc, :back
  add_dest_for_top doc
  state.pages.each {|it| fit_trim_box it } if (@optimize&.[] :compliance)&.start_with? 'PDF/X'
  nil
end

#convert_example(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1236

def convert_example node
  return convert_collapsible node if node.option? 'collapsible'
  caption_bottom = @theme.example_caption_end&.to_sym == :bottom
  arrange_block node do |extent|
    add_dest_for_block node if node.id
    tare_first_page_content_stream do
      theme_fill_and_stroke_block :example, extent, caption_node: caption_bottom ? nil : node
    end
    pad_box @theme.example_padding, node do
      theme_font :example do
        traverse node
      end
    end
  end
  # TODO: add protection against the bottom caption being widowed
  ink_caption node, category: :example, end: :bottom if caption_bottom
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_floating_title(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 697

def convert_floating_title node
  title = node.title
  hlevel = node.level.next
  unless (text_align = resolve_text_align_from_role node.roles)
    text_align = (@theme[%(heading_h#{hlevel}_text_align)] || @theme.heading_text_align || @base_text_align).to_sym
  end
  hopts = { align: text_align, level: hlevel, outdent: node.parent.context == :section }
  arrange_heading node, title, hopts unless at_page_top? || node.last_child?
  add_dest_for_block node if node.id
  # QUESTION: should we decouple styles from section titles?
  theme_font :heading, level: hlevel do
    ink_general_heading node, title, hopts
  end
end

#convert_image(node, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1707

def convert_image node, opts = {}
  target, image_format = (node.extend ::Asciidoctor::Image).target_and_format

  unless image_format == 'pdf'
    if (float_to = node.attr 'float') && ((BlockFloatNames.include? float_to) ? float_to : (float_to = nil))
      alignment = float_to.to_sym
    elsif (alignment = node.attr 'align')
      alignment = (BlockAlignmentNames.include? alignment) ? alignment.to_sym : :left
    elsif !(alignment = node.roles.reverse.find {|role| BlockAlignmentNames.include? role }&.to_sym)
      alignment = @theme.image_align&.to_sym || :left
    end
  end

  if image_format == 'gif' && !(defined? ::GMagick::Image)
    log :warn, %(GIF image format not supported. Install the prawn-gmagick gem or convert #{target} to PNG.)
    image_path = nil
  elsif ::Asciidoctor::Image::Base64Encoded === target
    image_path = target
  elsif (image_path = resolve_image_path node, target, image_format, (opts.fetch :relative_to_imagesdir, true))
    if image_format == 'pdf'
      if ::File.readable? image_path
        if (replace = page.empty?) && ((parent = node.parent).attr? 'pdf-page-start', page_number) && (parent.attr? 'pdf-anchor')
          replace_parent = parent
        end
        if (id = node.id) || replace_parent
          add_dest_block = proc do
            node_dest = dest_top
            if id
              node.set_attr 'pdf-destination', node_dest
              add_dest id, node_dest
            end
            if replace_parent
              replace_parent.set_attr 'pdf-destination', node_dest
              add_dest (replace_parent.attr 'pdf-anchor'), node_dest
            end
          end
        end
        # NOTE: import_page automatically advances to next page afterwards
        if (pgnums = node.attr 'pages')
          (resolve_pagenums pgnums).each_with_index do |pgnum, idx|
            if idx == 0
              import_page image_path, page: pgnum, replace: replace, &add_dest_block
            else
              import_page image_path, page: pgnum, replace: true
            end
          end
        else
          import_page image_path, page: [(node.attr 'page', nil, 1).to_i, 1].max, replace: replace, &add_dest_block
        end
        return
      else
        log :warn, %(pdf to insert not found or not readable: #{image_path})
        image_path = nil
      end
    elsif !(::File.readable? image_path)
      log :warn, %(image to embed not found or not readable: #{image_path})
      image_path = nil
    end
  end

  return on_image_error :missing, node, target, (opts.merge align: alignment) unless image_path

  # TODO: support cover (aka canvas) image layout using "canvas" (or "cover") role
  case (width = resolve_explicit_width node.attributes, bounds_width: (available_w = bounds.width), support_vw: true, use_fallback: true, constrain_to_bounds: true)
  when ViewportWidth
    # TODO: add `to_pt page_width` method to ViewportWidth type
    width = page_width * (width.to_f / 100)
  when ImageWidth
    scale = width.to_f / 100
    width = nil
  end

  caption_end = @theme.image_caption_end&.to_sym || :bottom
  caption_max_width = @theme.image_caption_max_width
  caption_max_width = 'fit-content' if float_to && !(caption_max_width&.start_with? 'fit-content')
  # NOTE: if width is not set explicitly and max-width is fit-content, caption height may not be accurate
  caption_h = node.title? ? (ink_caption node, category: :image, end: caption_end, block_align: alignment, block_width: width, max_width: caption_max_width, dry_run: true, force_top_margin: caption_end == :bottom) : 0

  align_to_page = node.option? 'align-to-page'
  pinned = opts[:pinned]

  begin
    rendered_h = rendered_w = nil
    span_page_width_if align_to_page do
      if image_format == 'svg'
        if ::Asciidoctor::Image::Base64Encoded === image_path
          svg_data = image_path.unpack1 'm'
          file_request_root = false
        else
          svg_data = ::File.read image_path, mode: 'r:UTF-8'
          file_request_root = { base: (::File.dirname image_path), root: @jail_dir }
        end
        svg_obj = ::Prawn::SVG::Interface.new svg_data, self,
          width: width,
          fallback_font_name: fallback_svg_font_name,
          enable_web_requests: allow_uri_read ? (method :load_open_uri).to_proc : false,
          enable_file_requests_with_root: file_request_root,
          cache_images: cache_uri
        rendered_w = (svg_size = svg_obj.document.sizing).output_width
        if scale
          svg_size = svg_obj.resize width: (rendered_w = [available_w, rendered_w * scale].min)
        elsif !width && (svg_obj.document.root.attributes.key? 'width') && rendered_w > available_w
          # NOTE: restrict width to available width (prawn-svg already coerces to pixels)
          svg_size = svg_obj.resize width: (rendered_w = available_w)
        end
        # NOTE: shrink image so it fits within available space; group image & caption
        if (rendered_h = svg_size.output_height) > (available_h = cursor - caption_h)
          unless pinned || at_page_top? || (node.first_child? && (node.parent.attr? 'pdf-at-top'))
            advance_page
            available_h = cursor - caption_h
          end
          rendered_w = (svg_obj.resize height: (rendered_h = available_h)).output_width if rendered_h > available_h
        end
        add_dest_for_block node if node.id
        ink_caption node, category: :image, end: :top, block_align: alignment, block_width: rendered_w, max_width: caption_max_width if caption_end == :top && node.title?
        image_y = y
        # NOTE: prawn-svg does not compute :at for alignment correctly in column box, so resort to our own logic
        case alignment
        when :center
          left = bounds.left + (available_w - rendered_w) * 0.5
        when :right
          left = bounds.left + available_w - rendered_w
        else
          left = bounds.left
        end
        svg_obj.options[:at] = [left, (image_cursor = cursor)]
        svg_obj.draw # NOTE: cursor advances automatically
        svg_obj.document.warnings.each do |img_warning|
          log :warn, %(problem encountered in image: #{image_path}; #{img_warning})
        end unless scratch?
        draw_image_border image_cursor, rendered_w, rendered_h, alignment unless pinned || (node.role? && (node.has_role? 'noborder'))
        if (link = node.attr 'link')
          add_link_to_image link, { width: rendered_w, height: rendered_h }, position: alignment, y: image_y
        end
      else
        # FIXME: this code really needs to be better organized!
        # NOTE: use low-level API to access intrinsic dimensions; build_image_object caches image data previously loaded
        image_obj, image_info = ::Asciidoctor::Image::Base64Encoded === image_path ?
            ::StringIO.open((image_path.unpack1 'm'), 'rb') {|fd| build_image_object fd } :
            ::File.open(image_path, 'rb') {|fd| build_image_object fd }
        actual_w = to_pt image_info.width, :px
        width = actual_w * scale if scale
        # NOTE: if width is not specified, scale native width & height from px to pt and restrict width to available width
        rendered_w, rendered_h = image_info.calc_image_dimensions width: (width || [available_w, actual_w].min)
        # NOTE: shrink image so it fits within available space; group image & caption
        if rendered_h > (available_h = cursor - caption_h)
          unless pinned || at_page_top? || (node.first_child? && (node.parent.attr? 'pdf-at-top'))
            advance_page
            available_h = cursor - caption_h
          end
          rendered_w = (image_info.calc_image_dimensions height: (rendered_h = available_h))[0] if rendered_h > available_h
        end
        add_dest_for_block node if node.id
        ink_caption node, category: :image, end: :top, block_align: alignment, block_width: rendered_w, max_width: caption_max_width if caption_end == :top && node.title?
        image_y = y
        left = bounds.left
        # NOTE: prawn does not compute :at for alignment correctly in column box, so resort to our own logic
        case alignment
        when :center
          left += (available_w - rendered_w) * 0.5
        when :right
          left += available_w - rendered_w
        end
        # NOTE: specify both width and height to avoid recalculation
        embed_image image_obj, image_info, at: [left, (image_cursor = cursor)], height: rendered_h, width: rendered_w
        draw_image_border image_cursor, rendered_w, rendered_h, alignment unless pinned || (node.role? && (node.has_role? 'noborder'))
        if (link = node.attr 'link')
          add_link_to_image link, { width: rendered_w, height: rendered_h }, position: alignment, y: image_y
        end
        # NOTE: Asciidoctor disables automatic advancement of cursor for raster images, so move cursor manually
        move_down rendered_h if y == image_y
      end
    end
    ink_caption node, category: :image, end: :bottom, block_align: alignment, block_width: rendered_w, max_width: caption_max_width if caption_end == :bottom && node.title?
    if !pinned && (block_next = next_enclosed_block node)
      if float_to && (supports_float_wrapping? block_next) && rendered_w < bounds.width
        init_float_box node, rendered_w, rendered_h + caption_h, float_to
      else
        theme_margin :block, :bottom, block_next
      end
    end
  rescue => e
    raise if ::StopIteration === e
    on_image_error :exception, node, target, (opts.merge align: alignment, message: %(could not embed image: #{image_path}; #{e.message}#{(recommend_prawn_gmagick? e, image_format) ? %(; install prawn-gmagick gem to add support for #{image_format&.upcase || 'unknown'} image format) : ''}))
  end
end

#convert_index_categories(categories, pagenum_sequence_style = nil) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 727

def convert_index_categories categories, pagenum_sequence_style = nil
  space_needed_for_category = @theme.description_list_term_spacing + (2 * (height_of_typeset_text 'A'))
  categories.each do |category|
    bounds.move_past_bottom if space_needed_for_category > cursor
    ink_prose category.name,
      align: :left,
      inline_format: false,
      margin_bottom: @theme.description_list_term_spacing,
      style: @theme.description_list_term_font_style&.to_sym
    category.terms.each {|term| convert_index_term term, pagenum_sequence_style }
    @theme.prose_margin_bottom > cursor ? bounds.move_past_bottom : (move_down @theme.prose_margin_bottom)
  end
end

#convert_index_section(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 712

def convert_index_section node
  if ColumnBox === bounds || (columns = @theme.index_columns || 1) < 2
    convert_index_categories @index.categories, (node.document.attr 'index-pagenum-sequence-style')
  else
    end_cursor = nil
    column_box [bounds.left, cursor], columns: columns, width: bounds.width, reflow_margins: true, spacer: @theme.index_column_gap do
      convert_index_categories @index.categories, (node.document.attr 'index-pagenum-sequence-style')
      end_cursor = cursor if bounds.current_column == 0
    end
    # Q: could we move this logic into column_box?
    move_cursor_to end_cursor if end_cursor
  end
  nil
end

#convert_index_term(term, pagenum_sequence_style = nil) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 741

def convert_index_term term, pagenum_sequence_style = nil
  term_fragments = term.name.fragments
  unless term.container?
    pagenum_fragment = (parse_text %(<a>#{DummyText}</a>), inline_format: true)[0]
    if @media == 'screen'
      case pagenum_sequence_style
      when 'page'
        pagenums = term.dests.uniq {|dest| dest[:page] }.map {|dest| pagenum_fragment.merge anchor: dest[:anchor], text: dest[:page] }
      when 'range'
        first_anchor_per_page = {}.tap {|accum| term.dests.each {|dest| accum[dest[:page]] ||= dest[:anchor] } }
        pagenums = (consolidate_ranges first_anchor_per_page.keys).map do |range|
          anchor = first_anchor_per_page[(range.include? '-') ? (range.partition '-')[0] : range]
          pagenum_fragment.merge text: range, anchor: anchor
        end
      else # term
        pagenums = term.dests.map {|dest| pagenum_fragment.merge text: dest[:page], anchor: dest[:anchor] }
      end
    else
      pagenums = consolidate_ranges term.dests.map {|dest| dest[:page] }.uniq
    end
    pagenums.each do |pagenum|
      if ::String === pagenum
        term_fragments << ({ text: %(, #{pagenum}) })
      else
        term_fragments << { text: ', ' }
        term_fragments << pagenum
      end
    end
  end
  subterm_indent = @theme.description_list_description_indent
  typeset_formatted_text term_fragments, (calc_line_metrics @base_line_height), align: :left, color: @font_color, hanging_indent: subterm_indent * 2, consolidate: true
  indent subterm_indent do
    term.subterms.each do |subterm|
      convert_index_term subterm, pagenum_sequence_style
    end
  end unless term.leaf?
end

#convert_inline_anchor(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2440

def convert_inline_anchor node
  doc = node.document
  target = node.target
  case node.type
  when :link
    anchor = node.id ? %(<a id="#{node.id}">#{DummyText}</a>) : ''
    attrs = []
    if (role = node.role)
      attrs << %( class="#{role}")
    end
    if (@media ||= doc.attr 'media', 'screen') != 'screen' && (target.start_with? 'mailto:')
      node.add_role 'bare' if (bare_target = target.slice 7, target.length) == (text = node.text)
      bare_target = target unless doc.attr? 'hide-uri-scheme'
    else
      bare_target = target
      text = node.text
    end
    if (role = node.attr 'role') && (role == 'bare' || (role.split.include? 'bare'))
      # QUESTION: should we insert breakable chars into URI when building fragment instead?
      %(#{anchor}<a href="#{target}"#{attrs.join}>#{breakable_uri text}</a>)
    # NOTE: @media may not be initialized if method is called before convert phase
    elsif (doc.attr? 'show-link-uri') || (@media != 'screen' && (doc.attr_unspecified? 'show-link-uri'))
      # QUESTION: should we insert breakable chars into URI when building fragment instead?
      # TODO: allow style of printed link to be controlled by theme
      %(#{anchor}<a href="#{target}"#{attrs.join}>#{text}</a> [<font size="0.85em">#{breakable_uri bare_target}</font>&#93;)
    else
      %(#{anchor}<a href="#{target}"#{attrs.join}>#{text}</a>)
    end
  when :xref
    # NOTE: non-nil path indicates this is an inter-document xref that's not included in current document
    if (path = node.attributes['path'])
      # NOTE: we don't use local as that doesn't work on the web
      %(<a href="#{target}">#{node.text || path}</a>)
    elsif (refid = node.attributes['refid'])
      if !(text = node.text) && AbstractNode === (ref = doc.catalog[:refs][refid]) && (@resolving_xref ||= (outer = true)) && outer
        if (text = ref.xreftext node.attr 'xrefstyle', nil, true)&.include? '<a'
          text = text.gsub DropAnchorRx, ''
        end
        if ref.inline? && ref.type == :bibref && !scratch? && (@bibref_refs.add? refid)
          anchor = %(<a id="_bibref_ref_#{refid}">#{DummyText}</a>)
        end
        @resolving_xref = nil
      end
      %(#{anchor || ''}<a anchor="#{derive_anchor_from_id refid}">#{text || "[#{refid}]"}</a>).gsub ']', '&#93;'
    else
      %(<a anchor="#{doc.attr 'pdf-anchor'}">#{node.text || '[^top&#93;'}</a>)
    end
  when :ref
    # NOTE: destination is created inside callback registered by FormattedTextTransform#build_fragment
    %(<a id="#{node.id}">#{DummyText}</a>)
  when :bibref
    id = node.id
    # NOTE: technically node.text should be node.reftext, but subs have already been applied to text
    reftext = (reftext = node.reftext) ? %([#{reftext}]) : %([#{id}])
    reftext = %(<a anchor="_bibref_ref_#{id}">#{reftext}</a>) if @bibref_refs.include? id
    # NOTE: destination is created inside callback registered by FormattedTextTransform#build_fragment
    %(<a id="#{id}">#{DummyText}</a>#{reftext})
  else
    log :warn, %(unknown anchor type: #{node.type.inspect})
    nil
  end
end

#convert_inline_break(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2503

def convert_inline_break node
  %(#{node.text}<br>)
end

#convert_inline_button(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2507

def convert_inline_button node
  %(<button>#{((load_theme node.document).button_content || '%s').sub '%s', node.text}</button>)
end

#convert_inline_callout(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2511

def convert_inline_callout node
  result = (conum_font_family = @theme.conum_font_family) == font_name ? (conum_glyph node.text.to_i) : %(<font name="#{conum_font_family}">#{conum_glyph node.text.to_i}</font>)
  if (conum_font_color = @theme.conum_font_color)
    # NOTE: CMYK value gets flattened here, but is restored by formatted text parser
    result = %(<font color="#{conum_font_color}">#{result}</font>)
  end
  result
end

#convert_inline_footnote(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2520

def convert_inline_footnote node
  if (index = node.attr 'index') && (fn = node.document.footnotes.find {|candidate| candidate.index == index })
    anchor = node.type == :xref ? '' : %(<a id="_footnoteref_#{index}">#{DummyText}</a>)
    if defined? @rendered_footnotes
      label = (@rendered_footnotes.include? fn) ? fn.label : (index - @rendered_footnotes.length)
    else
      label = index
    end
    %(<sup class="wj">#{anchor}[<a anchor="_footnotedef_#{index}">#{label}</a>]</sup>)
  elsif node.type == :xref
    %(<sup class="wj"><font color="#{theme.role_unresolved_font_color}">[#{node.text}]</font></sup>)
  else
    log :warn, %(unknown footnote type: #{node.type.inspect})
    nil
  end
end

#convert_inline_icon(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2537

def convert_inline_icon node
  if (icons = (doc = node.document).attr 'icons') == 'font'
    if (icon_name = node.target).include? '@'
      icon_name, icon_set = icon_name.split '@', 2
      explicit_icon_set = true
    elsif (icon_set = node.attr 'set')
      explicit_icon_set = true
    else
      icon_set = doc.attr 'icon-set', 'fa'
    end
    if icon_set == 'fa' || !(IconSets.include? icon_set)
      icon_set = 'fa'
      # legacy name from Font Awesome < 5
      if (remapped_icon_name = resolve_legacy_icon_name icon_name)
        requested_icon_name = icon_name
        icon_set, icon_name = remapped_icon_name.split '-', 2
        glyph = (icon_font_data icon_set).unicode icon_name
        log(:info) { %(#{requested_icon_name} icon found in deprecated fa icon set; using #{icon_name} from #{icon_set} icon set instead) }
      # new name in Font Awesome >= 5 (but document is configured to use fa icon set)
      else
        font_data = nil
        if (resolved_icon_set = FontAwesomeIconSets.find {|candidate| (font_data = icon_font_data candidate).unicode icon_name rescue nil })
          icon_set = resolved_icon_set
          glyph = font_data.unicode icon_name
          log(:info) { %(#{icon_name} icon not found in deprecated fa icon set; using match found in #{resolved_icon_set} icon set instead) }
        end
      end
    else
      glyph = (icon_font_data icon_set).unicode icon_name rescue nil
    end
    unless glyph || explicit_icon_set || !icon_name.start_with?(*IconSetPrefixes)
      icon_set, icon_name = icon_name.split '-', 2
      glyph = (icon_font_data icon_set).unicode icon_name rescue nil
    end
    if glyph
      if node.attr? 'size'
        case (size = node.attr 'size')
        when 'lg'
          size_attr = ' size="1.333em"'
        when 'fw'
          size_attr = ' width="1em"'
        else
          size_attr = %( size="#{size.sub 'x', 'em'}")
        end
      else
        size_attr = ''
      end
      class_attr = node.role? ? %( class="#{node.role}") : ''
      # TODO: support rotate and flip attributes
      %(<font name="#{icon_set}"#{size_attr}#{class_attr}>#{glyph}</font>)
    else
      log :warn, %(#{icon_name} is not a valid icon name in the #{icon_set} icon set)
      %([#{node.attr 'alt'}&#93;)
    end
  elsif icons
    image_path = ::File.absolute_path %(#{icon_name = node.target}.#{image_format = doc.attr 'icontype', 'png'}), (doc.attr 'iconsdir')
    if ::File.readable? image_path
      %(<img src="#{image_path}" format="#{image_format}" alt="#{node.attr 'alt'}" fit="line">)
    else
      log :warn, %(image icon for '#{icon_name}' not found or not readable: #{image_path})
      %([#{icon_name}&#93;)
    end
  else
    %([#{node.attr 'alt'}&#93;)
  end
end

#convert_inline_image(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2604

def convert_inline_image node
  if node.type == 'icon'
    img = convert_inline_icon node
  else
    target, image_format = (node.extend ::Asciidoctor::Image).target_and_format
    if image_format == 'gif' && !(defined? ::GMagick::Image)
      log :warn, %(GIF image format not supported. Install the prawn-gmagick gem or convert #{target} to PNG.)
      img = %([#{node.attr 'alt'}&#93;)
    # NOTE: an image with a data URI is handled using a temporary file
    elsif (image_path = resolve_image_path node, target, image_format)
      if ::File.readable? image_path
        class_attr = (role = node.role) ? %( class="#{role}") : ''
        fit_attr = (fit = node.attr 'fit') ? %( fit="#{fit}") : ''
        if (width = resolve_explicit_width node.attributes)
          if ImageWidth === width
            if state # check that converter is initialized
              width = (intrinsic_image_width image_path, image_format) * (width.to_f / 100)
            else
              width = %(auto*#{width})
            end
          elsif node.parent.context == :table_cell && ::String === width && (width.end_with? '%')
            width += (intrinsic_image_width image_path, image_format).to_s
          end
          width_attr = %( width="#{width}")
        elsif state # check that converter is initialized
          width_attr = %( width="#{intrinsic_image_width image_path, image_format}")
        else
          width_attr = ' width="auto"' # defer operation until arranger runs
        end
        img = %(<img src="#{image_path}" format="#{image_format}" alt="#{encode_quotes node.attr 'alt'}"#{width_attr}#{class_attr}#{fit_attr}>)
      else
        log :warn, %(image to embed not found or not readable: #{image_path})
        img = %([#{node.attr 'alt'}&#93;)
      end
    else
      img = %([#{node.attr 'alt'}&#93;)
    end
  end
  (node.attr? 'link') ? %(<a href="#{node.attr 'link'}">#{img}</a>) : img
end

#convert_inline_indexterm(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2645

def convert_inline_indexterm node
  visible = node.type == :visible
  if scratch?
    visible ? node.text : ''
  else
    unless defined? @index
      # NOTE: initialize index and text formatter in case converter is called before PDF is initialized
      @index = IndexCatalog.new
      @text_formatter = FormattedText::Formatter.new theme: (load_theme node.document)
    end
    # NOTE: page number (:page key) is added by InlineDestinationMarker
    dest = { anchor: (anchor_name = @index.next_anchor_name) }
    anchor = %(<a id="#{anchor_name}" type="indexterm"#{visible ? ' visible="true"' : ''}>#{DummyText}</a>)
    if visible
      visible_term = node.text
      @index.store_primary_term (FormattedString.new parse_text visible_term, inline_format: [normalize: true]), dest
      %(#{anchor}#{visible_term})
    else
      @index.store_term (node.attr 'terms').map {|term| FormattedString.new parse_text term, inline_format: [normalize: true] }, dest
      anchor
    end
  end
end

#convert_inline_kbd(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2669

def convert_inline_kbd node
  if (keys = node.attr 'keys').size == 1
    %(<kbd>#{keys[0]}</kbd>)
  else
    keys.map {|key| %(<kbd>#{key}</kbd>) }.join (load_theme node.document).kbd_separator
  end
end

#convert_inline_menu(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2677

def convert_inline_menu node
  menu = node.attr 'menu'
  caret = (load_theme node.document).menu_caret_content || %( \u203a )
  if !(submenus = node.attr 'submenus').empty?
    %(<menu>#{[menu, *submenus, (node.attr 'menuitem')].join caret}</menu>)
  elsif (menuitem = node.attr 'menuitem')
    %(<menu>#{menu}#{caret}#{menuitem}</menu>)
  else
    %(<menu>#{menu}</menu>)
  end
end

#convert_inline_quoted(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2689

def convert_inline_quoted node
  case node.type
  when :emphasis
    open, close, is_tag = ['<em>', '</em>', true]
  when :strong
    open, close, is_tag = ['<strong>', '</strong>', true]
  when :monospaced, :asciimath, :latexmath
    open, close, is_tag = ['<code>', '</code>', true]
  when :superscript
    open, close, is_tag = ['<sup>', '</sup>', true]
  when :subscript
    open, close, is_tag = ['<sub>', '</sub>', true]
  when :double
    open, close = (load_theme node.document).quotes.slice 0, 2
    quotes = true
  when :single
    open, close = (load_theme node.document).quotes.slice 2, 2
    quotes = true
  when :mark
    open, close, is_tag = ['<mark>', '</mark>', true]
  else
    open = close = ''
  end

  inner_text = node.text

  if quotes && (len = inner_text.length) > 3 && (inner_text.end_with? '...') &&
      !((inner_text_trunc = inner_text.slice 0, len - 3).end_with? ?\\)
    inner_text = inner_text_trunc + '&#8230;'
  end

  if (roles = node.role)
    inner_text = inner_text.gsub DoubleSpaceRx, ' ' + ZeroWidthSpace if (node.has_role? 'pre-wrap') && (inner_text.include? DoubleSpace)
    quoted_text = is_tag ? %(#{open.chop} class="#{roles}">#{inner_text}#{close}) : %(<span class="#{roles}">#{open}#{inner_text}#{close}</span>)
  else
    quoted_text = %(#{open}#{inner_text}#{close})
  end

  # NOTE: destination is created inside callback registered by FormattedTextTransform#build_fragment
  node.id ? %(<a id="#{node.id}">#{DummyText}</a>#{quoted_text}) : quoted_text
end

#convert_list(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1577

def convert_list node
  # TODO: check if we're within one line of the bottom of the page
  # and advance to the next page if so (similar to logic for section titles)
  ink_caption node, category: :list, labeled: false if node.title?

  opts = {}
  if (text_align = resolve_text_align_from_role node.roles)
    opts[:align] = text_align
  elsif node.style == 'bibliography'
    opts[:align] = :left
  elsif (text_align = @theme.list_text_align&.to_sym) # rubocop:disable Lint/DuplicateBranch
    # NOTE: theme setting only affects alignment of list text (not nested blocks)
    opts[:align] = text_align
  end

  line_metrics = calc_line_metrics @base_line_height
  #complex = false
  # ...or if we want to give all items in the list the same treatment
  #complex = node.items.any(&:compound?)
  if (node.context == :ulist && !@list_bullets[-1]) || (node.context == :olist && !@list_numerals[-1])
    if node.style == 'unstyled'
      # unstyled takes away all indentation
      list_indent = 0
    elsif (list_indent = @theme.list_indent) > 0
      # no-bullet aligns text with left-hand side of bullet position (as though there's no bullet)
      list_indent = [list_indent - (rendered_width_of_string %(#{node.context == :ulist ? ?\u2022 : '1.'}x)), 0].max
    end
  else
    list_indent = @theme.list_indent
  end
  indent list_indent do
    node.items.each do |item|
      allocate_space_for_list_item line_metrics
      convert_list_item item, node, opts
    end
  end
  theme_margin :prose, :bottom, (next_enclosed_block node) unless node.nested?
end

#convert_list_item(node, list, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1616

def convert_list_item node, list, opts = {}
  # TODO: move this to a draw_bullet (or draw_marker) method
  marker_style = {}
  marker_style[:font_color] = @theme.list_marker_font_color || @font_color
  marker_style[:font_family] = font_family
  marker_style[:font_size] = font_size
  marker_style[:line_height] = @base_line_height
  case (list_type = list.context)
  when :dlist
    # NOTE: list.style is always 'qanda'
    junction = node[1]
    @list_numerals << (index = @list_numerals.pop).next
    marker = %(#{index}.)
  when :olist
    junction = node
    if (index = @list_numerals.pop)
      if index == ''
        marker = ''
      else
        marker = node.parent.style == 'decimal' && index.abs < 10 ? %(#{index < 0 ? '-' : ''}0#{index.abs}.) : %(#{index}.)
        dir = (node.parent.option? 'reversed') ? :pred : :next
        @list_numerals << (index.public_send dir)
        [:font_color, :font_family, :font_size, :font_style, :line_height].each do |prop|
          marker_style[prop] = @theme[%(olist_marker_#{prop})] || marker_style[prop]
        end
      end
    end
  else # :ulist
    junction = node
    if (marker_type = @list_bullets[-1])
      if marker_type == :checkbox
        # QUESTION: should we remove marker indent if not a checkbox?
        if node.attr? 'checkbox'
          marker_type = (node.attr? 'checked') ? :checked : :unchecked
          marker = @theme[%(ulist_marker_#{marker_type}_content)] || BallotBox[marker_type]
        end
      else
        marker = @theme[%(ulist_marker_#{marker_type}_content)] || Bullets[marker_type]
      end
      [:font_color, :font_family, :font_size, :font_style, :line_height].each do |prop|
        marker_style[prop] = @theme[%(ulist_marker_#{marker_type}_#{prop})] || @theme[%(ulist_marker_#{prop})] || marker_style[prop]
      end if marker
    end
  end

  if marker
    if marker_style[:font_family] == 'fa'
      log :info, 'deprecated fa icon set found in theme; use fas, far, or fab instead'
      marker_style[:font_family] = FontAwesomeIconSets.find {|candidate| (icon_font_data candidate).yaml[candidate].value? marker } || 'fas'
    end
    marker_style[:font_style] &&= marker_style[:font_style].to_sym
    marker_gap = rendered_width_of_char 'x'
    font marker_style[:font_family], size: marker_style[:font_size], style: marker_style[:font_style] do
      marker_width = rendered_width_of_string marker
      # NOTE: compensate if character_spacing is not applied to first character
      # see https://github.com/prawnpdf/prawn/commit/c61c5d48841910aa11b9e3d6f0e01b68ce435329
      character_spacing_correction = 0
      character_spacing(-0.5) do
        character_spacing_correction = 0.5 if (rendered_width_of_char 'x', character_spacing: -0.5) == marker_gap
      end
      marker_height = height_of_typeset_text marker, line_height: marker_style[:line_height], single_line: true
      start_position = bounds.left - marker_width - marker_gap + character_spacing_correction
      float do
        advance_page if @media == 'prepress' && cursor < marker_height
        flow_bounding_box position: start_position, width: marker_width do
          ink_prose marker,
            align: :right,
            character_spacing: -0.5,
            color: marker_style[:font_color],
            inline_format: false,
            line_height: marker_style[:line_height],
            style: marker_style[:font_style],
            margin: 0,
            normalize: false,
            single_line: true
        end
      end
    end
  end

  opts = opts.merge margin_bottom: 0, normalize_line_height: true
  if junction
    if junction.compound?
      opts.delete :margin_bottom
    elsif next_enclosed_block junction, descend: true
      opts[:margin_bottom] = @theme.list_item_spacing
    end
  end
  traverse_list_item node, list_type, opts
end

#convert_olist(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1506

def convert_olist node
  add_dest_for_block node if node.id
  # TODO: move list_numeral resolve to a method
  case node.style
  when 'decimal'
    list_numeral = 1
  when 'loweralpha'
    list_numeral = 'a'
  when 'upperalpha'
    list_numeral = 'A'
  when 'lowerroman'
    list_numeral = RomanNumeral.new 'i', :lower
  when 'upperroman'
    list_numeral = RomanNumeral.new 'I', :upper
  when 'lowergreek'
    list_numeral = LowercaseGreekA
  when 'unstyled', 'unnumbered', 'no-bullet'
    list_numeral = nil
  when 'none'
    list_numeral = ''
  else # rubocop:disable Lint/DuplicateBranch
    list_numeral = 1
  end
  if !list_numeral.nil_or_empty? && (start = (node.attr 'start') || ((node.option? 'reversed') ? node.items.size : nil))
    if (start = start.to_i) > 1
      (start - 1).times { list_numeral = list_numeral.next }
    elsif start < 1 && !(::String === list_numeral)
      (start - 1).abs.times { list_numeral = list_numeral.pred }
    end
  end
  @list_numerals << list_numeral
  convert_list node
  @list_numerals.pop
end

#convert_open(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1255

def convert_open node
  return convert_abstract node if node.style == 'abstract'
  id = node.id
  has_title = node.title?
  if !at_page_top? && (has_title || id || (node.option? 'unbreakable'))
    arrange_block node do
      add_dest_for_block node if id
      tare_first_page_content_stream { ink_caption node, category: (node.style === 'table-container' ? :table : nil), labeled: false } if has_title
      traverse node
    end
  else
    add_dest_for_block node if id
    ink_caption node, labeled: false if has_title
    traverse node
  end
end

#convert_page_break(node) ⇒ Object

NOTE: to insert sequential page breaks, you must put nbsp between page breaks



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# File 'lib/asciidoctor/pdf/converter.rb', line 1941

def convert_page_break node
  if (page_layout = node.attr 'page-layout').nil_or_empty?
    unless node.role? && (page_layout = (node.roles.map(&:to_sym) & PageLayouts)[-1])
      page_layout = nil
    end
  elsif !(PageLayouts.include? (page_layout = page_layout.to_sym))
    page_layout = nil
  end

  if at_page_top? && !(node.option? 'always')
    if page_layout && page_layout != page.layout && page.empty?
      delete_current_page
      advance_page layout: page_layout, margin: @page_margin[page_layout][page_side nil, @folio_placement[:inverted]]
    end
  elsif page_layout
    bounds.current_column = bounds.last_column if ColumnBox === bounds && !(node.has_role? 'column')
    advance_page layout: page_layout, margin: @page_margin[page_layout][page_side nil, @folio_placement[:inverted]]
  else
    bounds.current_column = bounds.last_column if ColumnBox === bounds && !(node.has_role? 'column')
    advance_page
  end
end

#convert_paragraph(node, opts = nil) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 844

def convert_paragraph node, opts = nil
  add_dest_for_block node if node.id

  prose_opts = opts || { margin_bottom: 0, hyphenate: true }
  if (text_align = resolve_text_align_from_role (roles = node.roles), query_theme: true, remove_predefined: true)
    prose_opts[:align] = text_align
  else
    text_align = @base_text_align.to_sym
  end
  role_keys = roles.map {|role| %(role_#{role}) } unless roles.empty?
  if IndentableTextAlignments[text_align] &&
      ((text_indent = @theme.prose_text_indent) > 0 ||
      ((text_indent = @theme.prose_text_indent_inner) > 0 && node.previous_sibling&.context == :paragraph))
    prose_opts[:indent_paragraphs] = text_indent
  end
  if (bottom_gutter = @bottom_gutters[-1][node])
    prose_opts[:bottom_gutter] = bottom_gutter
  end

  block_next = next_enclosed_block node

  insert_margin_bottom = proc do
    if (margin_inner_val = @theme.prose_margin_inner) && block_next&.context == :paragraph
      margin_bottom margin_inner_val
    else
      theme_margin :prose, :bottom, block_next
    end
  end

  if (float_box = (@float_box ||= nil))
    ink_paragraph_in_float_box node, float_box, prose_opts, role_keys, block_next, insert_margin_bottom
  else
    # TODO: check if we're within one line of the bottom of the page
    # and advance to the next page if so (similar to logic for section titles)
    ink_caption node, labeled: false if node.title?
    role_keys ? theme_font_cascade(role_keys) { ink_prose node.content, prose_opts } : (ink_prose node.content, prose_opts)
    insert_margin_bottom.call
  end
end

#convert_pass(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1964

def convert_pass node
  theme_font :code do
    typeset_formatted_text [text: (guard_indentation node.content), color: @theme.base_font_color], (calc_line_metrics @base_line_height)
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_preamble(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 779

def convert_preamble node
  # FIXME: core should not be promoting paragraph to preamble if there are no sections
  if (first_block = node.first_child)&.context == :paragraph && node.document.sections? && !first_block.role?
    first_block.set_attr 'role', 'lead'
  end
  traverse node
  theme_margin :block, :bottom, (next_enclosed_block node)
  convert_toc node, placement: 'preamble'
end

#convert_quote_or_verse(node) ⇒ Object Also known as: convert_quote, convert_verse 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1272

def convert_quote_or_verse node
  category = node.context == :quote ? :quote : :verse
  # NOTE: b_width and b_left_width are mutually exclusive
  if (b_left_width = @theme[%(#{category}_border_left_width)]) && b_left_width > 0
    b_left_width = nil unless (b_color = resolve_theme_color %(#{category}_border_color), @theme.base_border_color, nil)
  else
    b_left_width = nil
    b_width = nil if (b_width = @theme[%(#{category}_border_width)]) == 0
  end
  if (attribution = node.attr 'attribution')
    # NOTE: temporary workaround to allow bare & to be used without having to wrap value in single quotes
    attribution = escape_amp attribution if attribution.include? '&'
    if (citetitle = node.attr 'citetitle')&.include? '&'
      citetitle = escape_amp citetitle
    end
  end
  arrange_block node do |extent|
    add_dest_for_block node if node.id
    tare_first_page_content_stream do
      theme_fill_and_stroke_block category, extent, border_width: b_width, caption_node: node
    end
    if extent && b_left_width
      float do
        extent.each_page do |first_page, last_page|
          advance_page unless first_page
          b_height = start_cursor = cursor
          b_height -= last_page.cursor if last_page
          bounding_box [bounds.left, start_cursor], width: bounds.width, height: b_height do
            stroke_vertical_rule b_color, line_width: b_left_width, at: b_left_width * 0.5
          end
        end
      end
    end
    pad_box @theme[%(#{category}_padding)], (attribution ? nil : node) do
      theme_font category do
        if category == :quote
          traverse node
        else # :verse
          content = guard_indentation node.content
          ink_prose content,
            normalize: false,
            align: (resolve_text_align_from_role node.roles) || :left,
            hyphenate: true,
            margin_bottom: 0,
            bottom_gutter: (attribution ? nil : @bottom_gutters[-1][node])
        end
      end
      if attribution
        theme_margin :block, :bottom
        theme_font %(#{category}_cite) do
          attribution_parts = citetitle ? [attribution, citetitle] : [attribution]
          ink_prose %(#{EmDash} #{attribution_parts.join ', '}), align: :left, normalize: false, margin_bottom: 0
        end
      end
    end
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_section(sect, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 637

def convert_section sect, _opts = {}
  if (sectname = sect.sectname) == 'abstract'
    # HACK: cheat a bit to hide this section from TOC; TOC should filter these sections
    sect.context = :open
    return convert_abstract sect
  elsif (index_section = sectname == 'index') && @index.empty?
    # override numbered_title to hide entry from TOC
    sect.define_singleton_method :numbered_title, ->(*) { '' }
    return
  end
  title = sect.numbered_title formal: true
  sep = (sect.attr 'separator') || (sect.document.attr 'title-separator') || ''
  if !sep.empty? && (title.include? (sep = %(#{sep} )))
    title, _, subtitle = title.rpartition sep
    title = %(#{title}\n<em class="subtitle">#{subtitle}</em>)
  end
  hlevel = sect.level.next
  text_align = (@theme[%(heading_h#{hlevel}_text_align)] || @theme.heading_text_align || @base_text_align).to_sym
  chapterlike = !(part = sectname == 'part') && (sectname == 'chapter' || (sect.document.doctype == 'book' && sect.level == 1))
  hidden = sect.option? 'notitle'
  hopts = { align: text_align, level: hlevel, part: part, chapterlike: chapterlike, outdent: !(part || chapterlike) }
  if part
    if @theme.heading_part_break_before == 'always'
      started_new = true
      start_new_part sect
    end
  elsif chapterlike
    if (@theme.heading_chapter_break_before == 'always' &&
        !(@theme.heading_part_break_after == 'avoid' && sect.first_section_of_part?)) ||
        (@theme.heading_part_break_after == 'always' && sect.first_section_of_part?)
      started_new = true
      start_new_chapter sect
    end
  end
  arrange_heading sect, title, hopts unless hidden || started_new || at_page_top?
  # QUESTION: should we store pdf-page-start, pdf-anchor & pdf-destination in internal map?
  sect.set_attr 'pdf-page-start', (start_pgnum = page_number)
  # QUESTION: should we just assign the section this generated id?
  # NOTE: section must have pdf-anchor in order to be listed in the TOC
  sect.set_attr 'pdf-anchor', (sect_anchor = derive_anchor_from_id sect.id, %(#{start_pgnum}-#{y.ceil}))
  add_dest_for_block sect, id: sect_anchor, y: (at_page_top? ? page_height : nil)
  theme_font :heading, level: hlevel do
    if part
      ink_part_title sect, title, hopts
    elsif chapterlike
      ink_chapter_title sect, title, hopts
    else
      ink_general_heading sect, title, hopts
    end
  end unless hidden

  if index_section
    outdent_section { convert_index_section sect }
  else
    traverse sect
  end
  outdent_section { ink_footnotes sect } if chapterlike
  sect.set_attr 'pdf-page-end', page_number
end

#convert_sidebar(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1334

def convert_sidebar node
  arrange_block node do |extent|
    add_dest_for_block node if node.id
    theme_fill_and_stroke_block :sidebar, extent if extent
    pad_box @theme.sidebar_padding, node do
      tare_first_page_content_stream do
        theme_font :sidebar_title do
          # QUESTION: should we allow margins of sidebar title to be customized?
          ink_prose node.title, align: (@theme.sidebar_title_text_align || @theme.heading_text_align || @base_text_align).to_sym, margin_bottom: @theme.heading_margin_bottom, line_height: (@theme.heading_line_height || @theme.base_line_height)
        end
      end if node.title?
      theme_font :sidebar do
        traverse node
      end
    end
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_stem(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1971

def convert_stem node
  arrange_block node do |extent|
    add_dest_for_block node if node.id
    tare_first_page_content_stream { theme_fill_and_stroke_block :code, extent, caption_node: node }
    pad_box @theme.code_padding, node do
      theme_font :code do
        typeset_formatted_text [text: (guard_indentation node.content), color: @font_color],
          (calc_line_metrics @base_line_height),
          bottom_gutter: @bottom_gutters[-1][node]
      end
    end
  end
  theme_margin :block, :bottom, (next_enclosed_block node)
end

#convert_table(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1986

def convert_table node
  caption_end = (theme = @theme).table_caption_end&.to_sym || :top
  if !at_page_top? && ((unbreakable = node.option? 'unbreakable') || ((node.option? 'breakable') && (node.id || node.title?)))
    # NOTE: we use the current node as the parent so we can navigate back into the document model
    (table_container = Block.new node, :open) << (table_dup = node.dup)
    # NOTE: we need to duplicate the attributes so that the unbreakable/breakable option is preserved on subsequent conversions
    table_dup.instance_variable_set :@attributes, node.attributes.dup
    if unbreakable
      table_dup.remove_attr 'unbreakable-option'
      table_container.set_attr 'unbreakable-option'
    else
      table_dup.remove_attr 'breakable-option'
    end
    table_container.style = 'table-container'
    table_container.id, table_dup.id = table_dup.id, nil
    if caption_end == :top && table_dup.title?
      table_container.title = ''
      table_container.instance_variable_set :@converted_title, table_dup.captioned_title
      table_dup.title = nil
    end
    return convert_open table_container
  end
  add_dest_for_block node if node.id
  # TODO: we could skip a lot of the logic below when num_rows == 0
  num_rows = node.attr 'rowcount'
  num_cols = node.columns.size
  table_header_size = false
  prev_font_scale, @font_scale = @font_scale, 1 if node.document.nested?

  tbl_bg_color = resolve_theme_color :table_background_color
  # QUESTION: should we fallback to page background color? (which is never transparent)
  #tbl_bg_color = resolve_theme_color :table_background_color, @page_bg_color
  # ...and if so, should we try to be helpful and use @page_bg_color for tables nested in blocks?
  #unless tbl_bg_color
  #  tbl_bg_color = @page_bg_color unless [:section, :document].include? node.parent.context
  #end

  # NOTE: emulate table bg color by using it as a fallback value for each element
  head_bg_color = resolve_theme_color :table_head_background_color, tbl_bg_color
  foot_bg_color = resolve_theme_color :table_foot_background_color, tbl_bg_color
  body_bg_color = resolve_theme_color :table_body_background_color, tbl_bg_color
  body_stripe_bg_color = resolve_theme_color :table_body_stripe_background_color, tbl_bg_color

  base_header_cell_data = nil
  header_cell_line_metrics = nil
  body_cell_padding = expand_padding_value theme.table_cell_padding

  table_data = []
  theme_font :table do
    head_rows = node.rows[:head]
    body_rows = node.rows[:body]
    #if (hrows = node.attr 'hrows') && (shift_rows = hrows.to_i - head_rows.size) > 0
    #  head_rows = head_rows.drop 0
    #  body_rows = body_rows.drop 0
    #  shift_rows.times { head_rows << body_rows.shift unless body_rows.empty? }
    #end
    theme_font :table_head do
      table_header_size = head_rows.size
      head_font_info = font_info
      head_line_metrics = calc_line_metrics theme.table_head_line_height || theme.table_cell_line_height || @base_line_height
      head_cell_padding = (theme.table_head_cell_padding ? (expand_padding_value theme.table_head_cell_padding) : body_cell_padding).drop 0
      head_cell_padding[0] += head_line_metrics.padding_top
      head_cell_padding[2] += head_line_metrics.padding_bottom
      # QUESTION: why doesn't text transform inherit from table?
      head_transform = resolve_text_transform :table_head_text_transform, nil
      base_cell_data = {
        inline_format: [normalize: true],
        background_color: head_bg_color,
        text_color: @font_color,
        size: head_font_info[:size],
        font: head_font_info[:family],
        font_style: head_font_info[:style],
        kerning: default_kerning?,
        padding: head_cell_padding,
        leading: head_line_metrics.leading,
        # TODO: patch prawn-table to pass through final_gap option
        #final_gap: head_line_metrics.final_gap,
      }
      head_rows.each do |row|
        table_data << (row.map do |cell|
          cell_text = head_transform ? (transform_text cell.text.strip, head_transform) : cell.text.strip
          cell_text = hyphenate_text cell_text, @hyphenator if defined? @hyphenator
          base_cell_data.merge \
            content: cell_text,
            colspan: cell.colspan || 1,
            align: (cell.attr 'halign').to_sym,
            valign: (val = cell.attr 'valign') == 'middle' ? :center : val.to_sym,
            source_location: cell.source_location
        end)
      end
    end unless head_rows.empty?

    base_cell_data = {
      font: (body_font_info = font_info)[:family],
      font_style: body_font_info[:style],
      size: body_font_info[:size],
      kerning: default_kerning?,
      text_color: @font_color,
    }
    body_cell_line_metrics = calc_line_metrics (theme.table_cell_line_height || @base_line_height)
    (body_rows + node.rows[:foot]).each do |row|
      table_data << (row.map do |cell|
        cell_data = base_cell_data.merge \
          colspan: cell.colspan || 1,
          rowspan: cell.rowspan || 1,
          align: (cell.attr 'halign').to_sym,
          valign: (val = cell.attr 'valign') == 'middle' ? :center : val.to_sym,
          source_location: cell.source_location
        cell_line_metrics = body_cell_line_metrics
        case cell.style
        when :emphasis
          cell_data[:font_style] = :italic
        when :strong
          cell_data[:font_style] = :bold
        when :header
          unless base_header_cell_data
            theme_font_cascade [:table_head, :table_header_cell] do
              header_cell_font_info = font_info
              base_header_cell_data = {
                text_color: @font_color,
                font: header_cell_font_info[:family],
                size: header_cell_font_info[:size],
                font_style: header_cell_font_info[:style],
                text_transform: @text_transform,
              }
              header_cell_line_metrics = calc_line_metrics @base_line_height
            end
            if (val = resolve_theme_color :table_header_cell_background_color, head_bg_color)
              base_header_cell_data[:background_color] = val
            end
          end
          cell_data.update base_header_cell_data
          cell_transform = cell_data.delete :text_transform
          cell_line_metrics = header_cell_line_metrics
        when :monospaced
          cell_data.delete :font_style
          cell_line_height = @base_line_height
          theme_font :codespan do
            mono_cell_font_info = font_info
            cell_data[:font] = mono_cell_font_info[:family]
            cell_data[:size] = mono_cell_font_info[:size]
            cell_data[:text_color] = @font_color
            cell_line_metrics = calc_line_metrics cell_line_height
          end
        when :literal
          # NOTE: we want the raw AsciiDoc in this case
          cell_data[:content] = guard_indentation cell.instance_variable_get :@text
          # NOTE: the absence of the inline_format option implies it's disabled
          cell_data.delete :font_style
          # QUESTION: should we introduce a dedicated category?
          theme_font :code do
            literal_cell_font_info = font_info
            cell_data[:font] = literal_cell_font_info[:family]
            cell_data[:size] = literal_cell_font_info[:size] * (cell_data[:size].to_f / @root_font_size)
            cell_data[:text_color] = @font_color
            cell_line_metrics = calc_line_metrics @base_line_height
          end
        when :asciidoc
          cell_data.delete :kerning
          if theme.table_asciidoc_cell_style == 'initial'
            cell_data.delete :font
            cell_data.delete :font_style
            cell_data.delete :size
            cell_data.delete :text_color
          end
          # NOTE: line metrics get applied when AsciiDoc content is converted
          cell_line_metrics = nil
          asciidoc_cell = ::Prawn::Table::Cell::AsciiDoc.new self, (cell_data.merge content: cell.inner_document, padding: body_cell_padding, root_font_size: @root_font_size)
          cell_data = { content: asciidoc_cell, source_location: cell.source_location }
        end
        if cell_line_metrics
          cell_padding = body_cell_padding.drop 0
          cell_padding[0] += cell_line_metrics.padding_top
          cell_padding[2] += cell_line_metrics.padding_bottom
          cell_data[:leading] = cell_line_metrics.leading
          # TODO: patch prawn-table to pass through final_gap option
          #cell_data[:final_gap] = cell_line_metrics.final_gap
          cell_data[:padding] = cell_padding
        end
        unless cell_data.key? :content
          cell_text = cell.text.strip
          cell_text = transform_text cell_text, cell_transform if cell_transform
          cell_text = hyphenate_text cell_text, @hyphenator if defined? @hyphenator
          cell_text = cell_text.gsub CjkLineBreakRx, ZeroWidthSpace if @cjk_line_breaks
          if cell_text.include? DoubleLF
            # FIXME: hard breaks not quite the same result as separate paragraphs; need custom cell impl here
            cell_data[:content] = (cell_text.split BlankLineRx).map {|l| l.tr_s WhitespaceChars, ' ' }.join DoubleLF
            cell_data[:inline_format] = true
          else
            cell_data[:content] = cell_text
            cell_data[:inline_format] = [normalize: true]
          end
        end
        if node.document.attr? 'cellbgcolor'
          if (cell_bg_color = node.document.attr 'cellbgcolor') == 'transparent'
            cell_data[:background_color] = body_bg_color
          elsif (cell_bg_color.start_with? '#') && (HexColorRx.match? cell_bg_color)
            cell_data[:background_color] = cell_bg_color.slice 1, cell_bg_color.length
          end
        end
        cell_data
      end)
    end
  end

  # NOTE: Prawn crashes if table data is empty, so ensure there's at least one row
  if table_data.empty?
    log(:warn) { message_with_context 'no rows found in table', source_location: node.source_location }
    table_data << ::Array.new([node.columns.size, 1].max) { { content: '' } }
  end

  rect_side_names = [:top, :right, :bottom, :left]
  grid_axis_names = [:rows, :cols]
  border_color = (rect_side_names.zip expand_rect_values theme.table_border_color, 'transparent').to_h
  border_style = (rect_side_names.zip (expand_rect_values theme.table_border_style, :solid).map(&:to_sym)).to_h
  border_width = (rect_side_names.zip expand_rect_values theme.table_border_width, 0).to_h
  grid_color = (grid_axis_names.zip expand_grid_values (theme.table_grid_color || [border_color[:top], border_color[:left]]), 'transparent').to_h
  grid_style = (grid_axis_names.zip (expand_grid_values (theme.table_grid_style || [border_style[:top], border_style[:left]]), :solid).map(&:to_sym)).to_h
  grid_width = (grid_axis_names.zip expand_grid_values (theme.table_grid_width || [border_width[:top], border_width[:left]]), 0).to_h

  if table_header_size
    head_border_bottom_color = theme.table_head_border_bottom_color || grid_color[:rows]
    head_border_bottom_style = theme.table_head_border_bottom_style&.to_sym || grid_style[:rows]
    head_border_bottom_width = theme.table_head_border_bottom_width || (grid_width[:rows] * 2.5)
  end

  case (grid = node.attr 'grid', 'all', 'table-grid')
  when 'all'
    # keep inner borders
  when 'cols'
    grid_width[:rows] = 0
  when 'rows'
    grid_width[:cols] = 0
  else # none
    grid_width[:rows] = grid_width[:cols] = 0
  end

  case (frame = node.attr 'frame', 'all', 'table-frame')
  when 'all'
    # keep outer borders
  when 'topbot', 'ends'
    border_width[:left] = border_width[:right] = 0
  when 'sides'
    border_width[:top] = border_width[:bottom] = 0
  else # none
    border_width[:top] = border_width[:right] = border_width[:bottom] = border_width[:left] = 0
  end

  if node.option? 'autowidth'
    table_width = (node.attr? 'width') ? bounds.width * ((node.attr 'tablepcwidth') / 100.0) :
        (((node.has_role? 'stretch')) ? bounds.width : nil)
    column_widths = []
  else
    table_width = bounds.width * ((node.attr 'tablepcwidth') / 100.0)
    column_widths = node.columns.map {|col| ((col.attr 'colpcwidth') * table_width) / 100.0 }
  end

  if ((alignment = node.attr 'align') && (BlockAlignmentNames.include? alignment)) ||
      (alignment = (node.roles & BlockAlignmentNames)[-1])
    alignment = alignment.to_sym
  else
    alignment = theme.table_align&.to_sym || :left
  end

  caption_max_width = theme.table_caption_max_width || 'fit-content'

  table_settings = {
    header: table_header_size,
    # NOTE: position is handled by this method
    position: :left,
    # NOTE: the border color, style, and width of the outer frame is set in the table callback block
    width: table_width,
    column_widths: column_widths,
  }
  cell_style = { border_color: grid_color.values, border_lines: grid_style.values, border_width: grid_width.values }

  # QUESTION: should we support nth; should we support sequence of roles?
  case node.attr 'stripes', nil, 'table-stripes'
  when 'all'
    table_settings[:row_colors] = [body_stripe_bg_color]
  when 'even'
    table_settings[:row_colors] = [body_bg_color, body_stripe_bg_color]
  when 'odd'
    table_settings[:row_colors] = [body_stripe_bg_color, body_bg_color]
  else # none
    table_settings[:row_colors] = [body_bg_color]
  end

  left_padding = right_padding = nil
  table table_data, table_settings do
    instance_variable_set :@node, node
    # NOTE: cell_style must be applied manually to be compatible with both prawn-table 0.2.2 and prawn-table 0.2.3
    cells.style cell_style
    @column_widths = column_widths unless column_widths.empty?
    # NOTE: call width to capture resolved table width
    table_width = width
    @pdf.ink_table_caption node, alignment, table_width, caption_max_width if caption_end == :top && node.title?
    # NOTE: align using padding instead of bounding_box as prawn-table does
    # using a bounding_box across pages mangles the margin box of subsequent pages
    if alignment != :left && table_width != (this_bounds = @pdf.bounds).width
      if alignment == :center
        left_padding = right_padding = (this_bounds.width - width) * 0.5
        this_bounds.add_left_padding left_padding
        this_bounds.add_right_padding right_padding
      else # :right
        left_padding = this_bounds.width - width
        this_bounds.add_left_padding left_padding
      end
    end
    if grid == 'none' && frame == 'none'
      (rows table_header_size - 1).tap do |r|
        r.border_bottom_color = head_border_bottom_color
        r.border_bottom_line = head_border_bottom_style
        r.border_bottom_width = head_border_bottom_width
      end if table_header_size
    else
      # apply the grid setting first across all cells
      cells.border_width = [grid_width[:rows], grid_width[:cols], grid_width[:rows], grid_width[:cols]]

      if table_header_size
        (rows table_header_size - 1).tap do |r|
          r.border_bottom_color = head_border_bottom_color
          r.border_bottom_line = head_border_bottom_style
          r.border_bottom_width = head_border_bottom_width
        end
        (rows table_header_size).tap do |r|
          r.border_top_color = head_border_bottom_color
          r.border_top_line = head_border_bottom_style
          r.border_top_width = head_border_bottom_width
        end if num_rows > table_header_size
      end

      # top edge of table
      (rows 0).tap do |r|
        r.border_top_color, r.border_top_line, r.border_top_width = border_color[:top], border_style[:top], border_width[:top]
      end
      # right edge of table
      (columns num_cols - 1).tap do |r|
        r.border_right_color, r.border_right_line, r.border_right_width = border_color[:right], border_style[:right], border_width[:right]
      end
      # bottom edge of table
      (rows num_rows - 1).tap do |r|
        r.border_bottom_color, r.border_bottom_line, r.border_bottom_width = border_color[:bottom], border_style[:bottom], border_width[:bottom]
      end
      # left edge of table
      (columns 0).tap do |r|
        r.border_left_color, r.border_left_line, r.border_left_width = border_color[:left], border_style[:left], border_width[:left]
      end
    end

    # QUESTION: should cell padding be configurable for foot row cells?
    unless node.rows[:foot].empty?
      foot_row = row num_rows.pred
      foot_row.background_color = foot_bg_color
      # FIXME: find a way to do this when defining the cells
      foot_row.text_color = theme.table_foot_font_color if theme.table_foot_font_color
      foot_row.size = theme.table_foot_font_size if theme.table_foot_font_size
      foot_row.font = theme.table_foot_font_family if theme.table_foot_font_family
      foot_row.font_style = theme.table_foot_font_style.to_sym if theme.table_foot_font_style
      # HACK: we should do this transformation when creating the cell
      #if (foot_transform = resolve_text_transform :table_foot_text_transform, nil)
      #  foot_row.each {|c| c.content = (transform_text c.content, foot_transform) if c.content }
      #end
    end
  end
  if left_padding
    bounds.subtract_left_padding left_padding
    bounds.subtract_right_padding right_padding if right_padding
  end
  ink_table_caption node, alignment, table_width, caption_max_width, caption_end if caption_end == :bottom && node.title?
  theme_margin :block, :bottom, (next_enclosed_block node)
rescue ::Prawn::Errors::CannotFit
  log :error, (message_with_context 'cannot fit contents of table cell into specified column width', source_location: node.source_location)
ensure
  @font_scale = prev_font_scale if prev_font_scale
end

#convert_thematic_break(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2363

def convert_thematic_break node
  pad_box @theme.thematic_break_padding || [@theme.thematic_break_margin_top, 0] do
    if (b_color = resolve_theme_color :thematic_break_border_color)
      stroke_horizontal_rule b_color,
        line_width: @theme.thematic_break_border_width,
        line_style: (@theme.thematic_break_border_style&.to_sym || :solid)
    end
  end
  conceal_page_top { theme_margin :block, :bottom, (next_enclosed_block node) }
end

#convert_toc(node, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 2374

def convert_toc node, opts = {}
  # NOTE: only allow document to have a single managed toc
  return if @toc_extent
  is_macro = (placement = opts[:placement] || 'macro') == 'macro'
  if ((doc = node.document).attr? 'toc-placement', placement) && (doc.attr? 'toc') && !(get_entries_for_toc doc).empty?
    start_toc_page node, placement if (is_book = doc.doctype == 'book')
    add_dest_for_block node, id: (node.id || 'toc') if is_macro
    toc_extent = @toc_extent = allocate_toc doc, (doc.attr 'toclevels', 2).to_i, cursor, (title_as_page = is_book || (doc.attr? 'title-page'))
    if title_as_page
      if @theme.page_numbering_start_at == 'toc'
        @index.start_page_number = toc_extent.from.page
      elsif @theme.page_numbering_start_at == 'after-toc'
        new_start_page_number = toc_extent.to.page + 1
        new_start_page_number += 1 if @ppbook && (verso_page? new_start_page_number)
        @index.start_page_number = new_start_page_number
      end
    end
    if is_macro
      @disable_running_content[:header] += toc_extent.page_range if node.option? 'noheader'
      @disable_running_content[:footer] += toc_extent.page_range if node.option? 'nofooter'
    end
  end
  nil
end

#convert_ulist(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1541

def convert_ulist node
  add_dest_for_block node if node.id
  # TODO: move bullet_type to method on List (or helper method)
  if node.option? 'checklist'
    @list_bullets << :checkbox
  else
    if (style = node.style)
      case style
      when 'bibliography'
        bullet_type = :square
      when 'unstyled', 'no-bullet'
        bullet_type = nil
      else
        if Bullets.key? (candidate = style.to_sym)
          bullet_type = candidate
        else
          log :warn, %(unknown unordered list style: #{candidate})
          bullet_type = :disc
        end
      end
    else
      case node.list_level
      when 1
        bullet_type = :disc
      when 2
        bullet_type = :circle
      else
        bullet_type = :square
      end
    end
    @list_bullets << bullet_type
  end
  convert_list node
  @list_bullets.pop
end

#convert_video(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 1903

def convert_video node
  case (poster = node.attr 'poster')
  when 'youtube'
    video_path = %(https://www.youtube.com/watch?v=#{video_id = node.attr 'target'})
    # see http://stackoverflow.com/questions/2068344/how-do-i-get-a-youtube-video-thumbnail-from-the-youtube-api
    poster = allow_uri_read ? %(https://img.youtube.com/vi/#{video_id}/maxresdefault.jpg) : nil
    type = 'YouTube video'
  when 'vimeo'
    video_path = %(https://vimeo.com/#{video_id = node.attr 'target'})
    if allow_uri_read
      poster = load_open_uri.open_uri(%(https://vimeo.com/api/oembed.xml?url=https%3A//vimeo.com/#{video_id}&width=1280), 'r') {|f| (VimeoThumbnailRx.match f.read)[1] } rescue nil
    else
      poster = nil
    end
    type = 'Vimeo video'
  else
    video_path = node.media_uri node.attr 'target'
    type = 'video'
  end

  if poster.nil_or_empty?
    add_dest_for_block node if node.id
    play_symbol = (node.document.attr? 'icons', 'font') ? %(<font name="fas">#{(icon_font_data 'fas').unicode 'play'}</font>) : RightPointer
    ink_prose %(#{play_symbol}#{NoBreakSpace}<a href="#{video_path}">#{video_path}</a> <em>(#{type})</em>), normalize: false, margin: 0
    ink_caption node, labeled: false, end: :bottom if node.title?
    theme_margin :block, :bottom, (next_enclosed_block node)
  else
    original_attributes = node.attributes.dup
    begin
      node.update_attributes 'target' => poster, 'link' => video_path
      convert_image node
    ensure
      node.attributes.replace original_attributes
    end
  end
end

#expand_tabs(string) ⇒ Object

NOTE: only used when tabsize attribute is not specified tabs must always be replaced with spaces in order for the indentation guards to work



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# File 'lib/asciidoctor/pdf/converter.rb', line 2896

def expand_tabs string
  if string.nil_or_empty?
    ''
  elsif string.include? TAB
    full_tab_space = ' ' * (tab_size = 4)
    (string.split LF, -1).map do |line|
      if line.empty? || !(tab_idx = line.index TAB)
        line
      else
        if tab_idx == 0
          leading_tabs = 0
          line.each_byte do |b|
            break unless b == 9
            leading_tabs += 1
          end
          line = %(#{full_tab_space * leading_tabs}#{rest = line.slice leading_tabs, line.length})
          next line unless rest.include? TAB
        end
        # keeps track of how many spaces were added to adjust offset in match data
        spaces_added = 0
        idx = 0
        result = ''
        line.each_char do |c|
          if c == TAB
            # calculate how many spaces this tab represents, then replace tab with spaces
            if (offset = idx + spaces_added) % tab_size == 0
              spaces_added += (tab_size - 1)
              result += full_tab_space
            else
              unless (spaces = tab_size - offset % tab_size) == 1
                spaces_added += (spaces - 1)
              end
              result += (' ' * spaces)
            end
          else
            result += c
          end
          idx += 1
        end
        result
      end
    end.join LF
  else
    string
  end
end

#extract_conums(string) ⇒ Object

Extract callout marks from string, indexed by 0-based line number Return an Array with the processed string as the first argument and the mapping of lines to conums as the second.



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# File 'lib/asciidoctor/pdf/converter.rb', line 2946

def extract_conums string
  conum_mapping = {}
  auto_num = 0
  string = (string.split LF).map.with_index do |line, line_num|
    # FIXME: we get extra spaces before numbers if more than one on a line
    if line.include? '<'
      line = line.gsub CalloutExtractRx do
        # honor the escape
        if $1 == ?\\
          $&.sub $1, ''
        else
          (conum_mapping[line_num] ||= []) << ($3 == '.' ? (auto_num += 1) : $3.to_i)
          ''
        end
      end
      # NOTE: use first position to store space that precedes conums
      if (conum_mapping.key? line_num) && (line.end_with? ' ')
        trimmed_line = line.rstrip
        conum_mapping[line_num].unshift line.slice trimmed_line.length, line.length
        line = trimmed_line
      end
    end
    line
  end.join LF
  conum_mapping = nil if conum_mapping.empty?
  [string, conum_mapping]
end

#fallback_svg_font_name ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 3025

def fallback_svg_font_name
  @theme.svg_fallback_font_family || @theme.svg_font_family || @theme.base_font_family
end

#get_entries_for_toc(node) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 3864

def get_entries_for_toc node
  node.sections
end

#guard_indentation(string) ⇒ Object

Add an indentation guard at the start of indented lines. Expand tabs to spaces if tabs are present



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# File 'lib/asciidoctor/pdf/converter.rb', line 3031

def guard_indentation string
  unless (string = expand_tabs string).empty?
    string[0] = GuardedIndent if string.start_with? ' '
    string.gsub! InnerIndent, GuardedInnerIndent if string.include? InnerIndent
  end
  string
end

#guard_indentation_in_fragments(fragments) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 3039

def guard_indentation_in_fragments fragments
  start_of_line = true
  fragments.each do |fragment|
    next if (text = fragment[:text]).empty?
    if start_of_line && (text.start_with? ' ')
      fragment[:text] = GuardedIndent + (((text = text.slice 1, text.length).include? InnerIndent) ? (text.gsub InnerIndent, GuardedInnerIndent) : text)
    elsif text.include? InnerIndent
      fragment[:text] = text.gsub InnerIndent, GuardedInnerIndent
    end
    start_of_line = text.end_with? LF
  end
  fragments
end

#height_of_typeset_text(string, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor/pdf/converter.rb', line 3053

def height_of_typeset_text string, opts = {}
  if (transform = opts[:text_transform])
    string = transform_text string, transform
  end
  if (inline_format = opts[:inline_format]) &&