Class: Asciidoctor::Html::RefTreeProcessor

Inherits:
Extensions::TreeProcessor
  • Object
show all
Defined in:
lib/asciidoctor/html/ref_tree_processor.rb

Overview

Traverses the document tree and:

  • attaches a correct reftext to numbered nodes;

  • populates the text (= reftext for inline nodes) of anchors at the beginning of a list item for an ordered list;

  • registers every encountered source code language not included in the default highlightjs build.

Constant Summary collapse

NUMBERED_CONTEXTS = 
{
  example: "thm-number",
  table: "tbl-number",
  image: "fig-number",
  stem: "eqn-number",
  listing: "ltg-number"
}.freeze

Instance Method Summary collapse

Instance Method Details

#assign_numeral!(node, document, counter_name) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 25

def assign_numeral!(node, document, counter_name)
  document.counters[counter_name] ||= 0
  node.numeral = (document.counters[counter_name] += 1)
end

#bullet(depth) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 84

def bullet(depth)
  case depth
  when 1 then "‐"
  when 2 then "⭑"
  when 3 then "◦"
  else "•"
  end
end

#colist?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 184

def colist?(node)
  node.context == :colist
end

#env(context, style) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 54

def env(context, style)
  case context
  when :image then "figure"
  when :stem then "equation"
  when :listing then "listing"
  else style || context.to_s
  end
end

#li_mark(depth, idx) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 75

def li_mark(depth, idx)
  case depth
  when 1 then ("a".."z").to_a[idx]
  when 2 then RomanNumerals.to_roman(idx + 1).downcase
  when 3 then ("a".."z").to_a[idx].upcase
  else idx + 1
  end
end

#offset(list) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 99

def offset(list)
  list.attr?("start") ? (list.attr("start").to_i - 1) : 0
end

#olist?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 180

def olist?(node)
  node.context == :olist
end

#olist_item?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 168

def olist_item?(node)
  node.context == :list_item && node.parent.context == :olist
end

#process(document) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 192

def process(document)
  listdepth = 0
  bulletdepth = 0
  flat_style = false
  flat_idx = 0 # flat index for (pseudocode) list
  tw = TreeWalker.new document
  while (block = tw.next_block)
    unless block.attr? "refprocessed"
      process_numbered_block!(block, document) if process_numbered_block?(block)
      if colist? block
        process_colist! block
      elsif olist? block
        if listdepth.zero?
          flat_style = (block.style == "pseudocode")
          flat_idx = offset block # rubocop:disable Lint/UselessAssignment
        end
        process_olist! block, listdepth, flat_style:
      elsif olist_item?(block) && flat_style
        process_flat_item! block, flat_idx
        flat_idx += 1
      elsif source_code? block
        process_source_code! document, block.attr("language")
      elsif ulist? block
        process_ulist! block, bulletdepth
      end
      block.set_attr "refprocessed", true
    end
    tw.walk do |move|
      listdepth += 1 if olist?(block) && move == :explore
      listdepth -= 1 if olist_item?(block) && move == :retreat
      bulletdepth += 1 if ulist?(block) && move == :explore
      bulletdepth -= 1 if ulist_item?(block) && move == :retreat
    end
  end
end

#process_colist!(block) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 135

def process_colist!(block)
  block.set_attr "list-depth", 0
  block.items.each_with_index do |item, idx|
    icon = %(<i class="bi bi-#{idx + 1}-circle"></i>)
    item.set_attr "mark", icon
    register_reftext! item, icon
  end
end

#process_flat_item!(item, idx) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 156

def process_flat_item!(item, idx)
  mark = li_mark(0, idx)
  item.set_attr "mark", mark
  register_reftext! item, ref_li_mark(mark, 0)
end

#process_numbered_block!(block, document) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 38

def process_numbered_block!(block, document)
  context = block.context
  style = block.style
  context = :image if style == "figlist"
  env = env context, style
  block.set_attr("showcaption", true) unless context == :stem
  assign_numeral! block, document, NUMBERED_CONTEXTS[context]
  relative_numeral = relative_numeral block, document
  reftext = if context == :stem
              "(#{relative_numeral})"
            else
              "#{env.capitalize} #{relative_numeral}"
            end
  block.set_attr "reftext", reftext
end

#process_numbered_block?(block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 63

def process_numbered_block?(block)
  context = block.context
  case context
  when :olist
    block.style == "figlist"
  when :stem, :listing
    block.option? "numbered"
  else
    NUMBERED_CONTEXTS.include? context
  end
end

#process_olist!(block, depth, flat_style: false) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 112

def process_olist!(block, depth, flat_style: false)
  parent_reftext = ""
  if depth.positive?
    parent = block.parent
    parent = parent.parent until parent.context == :list_item
    parent_reftext = parent.reftext? ? parent.reftext : ""
  end
  block.set_attr "list-depth", depth
  if flat_style
    block.set_attr("flat-style", true)
  else
    offset = offset block
    style = block.style
    block.items.each_with_index do |item, idx|
      d = style == "figlist" ? 1 : depth
      mark = li_mark(d, idx + offset)
      item.set_attr "mark", mark
      item_reftext = "#{parent_reftext}#{ref_li_mark mark, d, style}"
      register_reftext! item, item_reftext
    end
  end
end

#process_source_code!(document, lang) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 162

def process_source_code!(document, lang)
  document.set_attr("source-langs", {}) unless document.attr?("source-langs")
  langs = document.attr "source-langs"
  langs[lang] = true unless Highlightjs::INCLUDED_LANGS.include?(lang)
end

#process_ulist!(block, depth) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 144

def process_ulist!(block, depth)
  block.set_attr "list-depth", depth
  block.items.each do |item|
    is_checkbox = item.attr? "checkbox"
    icon_class = item.attr?("checked") ? "check-" : ""
    icon = %(<i class="bi bi-#{icon_class}square"></i>)
    mark = is_checkbox ? icon : bullet(depth)
    item.role = "checked" if is_checkbox
    item.set_attr "mark", mark
  end
end

#ref_li_mark(mark, depth, style = nil) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 93

def ref_li_mark(mark, depth, style = nil)
  return "[#{mark}]" if style == "bibliography"

  depth.even? ? mark.to_s : "(#{mark})"
end

#register_reftext!(item, reftext) ⇒ Object

Finds an anchor at the start of item.text and updates its reftext to that of item’s if necessary.



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 105

def register_reftext!(item, reftext)
  item.set_attr "reftext", reftext
  /\A<a id="(?<anchor_id>.+?)"/ =~ item.text
  node = item.document.catalog[:refs][anchor_id]
  node&.text ||= reftext
end

#relative_numeral(node, document) ⇒ Object 



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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 30

def relative_numeral(node, document)
  return "" unless node.numeral

  chapnum = document.attr "chapnum"
  has_prefix = chapnum && !chapnum.empty? && chapnum != "0"
  has_prefix ? "#{chapnum}.#{node.numeral}" : node.numeral.to_s
end

#source_code?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 188

def source_code?(node)
  node.context == :listing && node.style == "source" && node.attr?("language")
end

#ulist?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 176

def ulist?(node)
  node.context == :ulist
end

#ulist_item?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor/html/ref_tree_processor.rb', line 172

def ulist_item?(node)
  node.context == :list_item && node.parent.context == :ulist
end