Class: MarkdownPPConverter

Inherits:
Asciidoctor::Converter::Base
  • Object
show all
Defined in:
lib/asciidoctor/converter/mdpp.rb

Instance Method Summary collapse

Instance Method Details

#convert(node, transform = node.node_name) ⇒ Object 



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

def convert(node, transform = node.node_name)
  method = "convert_#{transform}"
  respond_to?(method) ? send(method, node) : "<!-- TODO: #{transform} -->"
end

#convert_admonition(node) ⇒ Object

Render an admonition block as a Markdown++ styled block Emit a style comment and a blockquote for each content line



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# File 'lib/asciidoctor/converter/mdpp.rb', line 336

def convert_admonition(node)
  # Build style tag (e.g., AdmonitionNote, AdmonitionTip)
  style = "Admonition#{node.caption}"
  # Gather content lines: use nested blocks if present, else raw lines
  if node.blocks.any?
    # convert each child block and accumulate its lines
    content = node.blocks.map { |b| convert(b) }.join("\n")
    lines = content.lines.map(&:chomp)
    suffix = ''
  else
    # fallback to raw source lines for short-form admonition
    lines = node.lines.map(&:chomp)
    suffix = "\n"
  end
  # Quote each line
  quoted = lines.map { |line| "> #{line}" }.join("\n")
  # Prepend style comment and content, with optional suffix
  "<!-- style:#{style} -->\n" + quoted + suffix
end

#convert_document(doc) ⇒ Object

Render the document: title and top-level blocks (preamble, sections, etc.)



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# File 'lib/asciidoctor/converter/mdpp.rb', line 113

def convert_document(doc)
  # Prepare document title or fallback to first section title
  parts = []
  # Copy blocks to avoid mutating original
  blocks = doc.blocks.dup
  if doc.header && doc.header.title && !doc.header.title.empty?
    # Use document title
    parts << convert(doc.header, 'header')
    rest_blocks = blocks
  elsif blocks.first && blocks.first.node_name == 'section'
    # Promote first section title as document title
    first_sec = blocks.shift
    title = first_sec.title
    parts << "#{title}\n#{'=' * title.length}"
    # Render child blocks of that first section, then any remaining top-level blocks
    rest_blocks = first_sec.blocks + blocks
  else
    rest_blocks = blocks
  end
  # Render each remaining block
  rest_blocks.each do |blk|
    parts << convert(blk)
  end
  # Join parts with blank lines
  result = parts.compact.join("\n\n")
  # Append trailing newline if last document block is a standalone image macro paragraph
  if doc.blocks.any? && doc.blocks.last.node_name == 'paragraph' && doc.blocks.last.lines.size == 1 && doc.blocks.last.lines.first.strip.start_with?('image:')
    result << "\n"
  end
  result
end

#convert_example(node) ⇒ Object

Render an example block (==== delimited) as nested blockquote lines



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# File 'lib/asciidoctor/converter/mdpp.rb', line 357

def convert_example(node)
  # indent level for example block
  indent_str = '>'
  prefix_str = indent_str + ' '
  lines = []
  node.blocks.each_with_index do |b, idx|
    if b.node_name == 'listing'
      # nested listing block: increase indent
      content = convert_listing(b)
      nested_indent = '>' * 2
      nested_prefix = nested_indent + ' '
      content.split("\n", -1).each do |line|
        if line.empty?
          lines << nested_prefix
        else
          lines << nested_prefix + line
        end
      end
    else
      content = convert(b)
      content.split("\n", -1).each do |line|
        if line.empty?
          lines << indent_str
        else
          lines << prefix_str + line
        end
      end
    end
    # separator blank line between blocks
    if idx < node.blocks.size - 1
      # first separator without space, subsequent with space
      if idx == 0
        lines << indent_str
      else
        lines << prefix_str
      end
    end
  end
  lines.join("\n")
end

#convert_header(header) ⇒ Object

Render the document title (from = Title) as a Markdown++ setext header



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

def convert_header(header)
  title = header.title
  underline = '=' * title.length
  "#{title}\n#{underline}"
end

#convert_image(node) ⇒ Object Also known as: convert_inline_image

Render a block-level or inline image as a Markdown image with optional dimensions



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# File 'lib/asciidoctor/converter/mdpp.rb', line 300

def convert_image(node)
  # Determine alternate text: use explicit first positional attribute if provided; otherwise, no alt text
  alt = node.attributes.key?(1) ? node.attributes[1].to_s : ''
  # Determine source URL or path
  src = node.inline? ? node.target : node.attr('target')
  # Extract width and height (may include percentage units)
  width = node.attr('width') || node.attributes[2]
  height = node.attr('height') || node.attributes[3]
  # Build style name: handle numeric and percentage dimensions
  style_parts = []
  if width
    w = width.to_s
    style_parts << (w.end_with?('%') ? "w#{w.chomp('%')}percent" : "w#{w}")
  end
  if height
    h = height.to_s
    style_parts << (h.end_with?('%') ? "h#{h.chomp('%')}percent" : "h#{h}")
  end
  style = style_parts.join
  # Assemble Markdown image
  img = "![#{alt}](#{src})"
  # Prepend style comment only if dimensions were specified
  style.empty? ? img : "<!-- style:#{style} -->#{img}"
end

#convert_inline_anchor(node) ⇒ Object

Render inline anchor macros: xrefs and explicit anchors



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# File 'lib/asciidoctor/converter/mdpp.rb', line 254

def convert_inline_anchor(node)
  case node.type
  when :xref
    # Render cross-reference as a Markdown++ link
    text = node.text || node.target
    # node.target may include a leading '#', so do not add an extra
    "[#{text}](#{node.target})"
  when :ref
    # Render an explicit anchor id as a comment
    "<!-- ##{node.id} -->"
  else
    # Unknown inline anchor, omit
    ""
  end
end

#convert_inline_quoted(node) ⇒ Object

Render inline quoted text (e.g., text) as Markdown++ strong syntax



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# File 'lib/asciidoctor/converter/mdpp.rb', line 329

def convert_inline_quoted(node)
  # Always use double asterisks to denote quoted text
  "**#{node.text}**"
end

#convert_list_item(node) ⇒ Object

Render a list item: include its text and any nested blocks



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# File 'lib/asciidoctor/converter/mdpp.rb', line 245

def convert_list_item(node)
  parts = [node.text]
  node.blocks.each do |b|
    parts << convert(b)
  end
  parts.join("\n")
end

#convert_listing(node) ⇒ Object

Render a listing block (---- delimited) or source blocks as Markdown++ code fences



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# File 'lib/asciidoctor/converter/mdpp.rb', line 406

def convert_listing(node)
  # Simple listing blocks outside of example context: no language code fence
  if node.style == 'listing' && node.parent.node_name != 'example'
    return "```\n" + node.lines.join("\n") + "\n```"
  end
  # Named source code fence outside of example context: include language
  if node.style == 'source' && node.parent.node_name != 'example'
    lang = node.attr('language') || node.attributes[2]
    return "```#{lang}\n" + node.lines.join("\n") + "\n```"
  end
  # Fallback: convert content groups into paragraphs or headings
  lines = node.lines
  groups = []
  current = []
  lines.each do |line|
    if line.strip.empty?
      groups << current unless current.empty?
      current = []
    else
      current << line
    end
  end
  groups << current unless current.empty?
  parts = groups.map do |group|
    if group.size == 1 && (m = group[0].match(/^(=+)\s*(.*)/))
      level = m[1].length
      "#{'#' * level} #{m[2]}"
    else
      group.join(' ')
    end
  end
  parts.join("\n\n")
end

#convert_literal(node) ⇒ Object

Render a literal block (.... delimited) as a code fence



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# File 'lib/asciidoctor/converter/mdpp.rb', line 399

def convert_literal(node)
  lines = node.lines
  # Wrap literal block in Markdown++ code fence
  "```\n" + lines.join("\n") + "\n```"
end

#convert_olist(olist) ⇒ Object

Render an ordered list with proper indentation for nested levels



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# File 'lib/asciidoctor/converter/mdpp.rb', line 35

def convert_olist(olist)
  # indent nested ordered lists (two spaces per nested level) only when under another list item
  if olist.parent.respond_to?(:node_name) && olist.parent.node_name == 'list_item'
    indent = '  ' * (olist.level - 1)
  else
    indent = ''
  end
  olist.items.each_with_index.map do |li, idx|
    index = idx + 1
    prefix = "#{indent}#{index}. "
    # Attempt to recover inline breaks from raw source when AST loses continuation
    raw_conv = nil
    if li.respond_to?(:source_location) && (loc = li.source_location)
      # Determine source file path (absolute if available, otherwise relative)
      raw_path = loc.respond_to?(:file) && loc.file ? loc.file : loc.path
      ln = loc.lineno
      raw_lines = nil
      if raw_path
        if File.exist?(raw_path)
          raw_lines = File.readlines(raw_path)
        else
          if (docfile = li.document.attr('docfile'))
            base = File.dirname(docfile)
            candidate = File.join(base, raw_path)
            raw_lines = File.readlines(candidate) if File.exist?(candidate)
          end
        end
      end
      if raw_lines
        # Check for trailing '+' on the first list-item line
        first_line = raw_lines[ln - 1].chomp("\n")
        if first_line.rstrip.end_with?('+')
          # Collect all lines belonging to this list item continuation
          i = ln - 1
          segments = []
          while i < raw_lines.size
            line = raw_lines[i].chomp("\n")
            # Stop at next list-item marker or blank line
            break if line.lstrip =~ /^(?:\d+\.\s|\.\s)/ || line.strip.empty?
            # Remove trailing '+' if present
            seg = line.rstrip
            seg = seg.chomp('+').rstrip if seg.end_with?('+')
            segments << seg
            i += 1
          end
          if segments.any?
            # Determine marker prefix from the first segment
            if (m = segments[0].match(/^\s*(?:\d+\.\s|\.\s)/))
              marker = m[0]
            else
              marker = prefix
            end
            # Build recovered lines: first with marker, continuations indented
            lines_out = []
            # first segment text after marker
            text0 = segments[0][marker.length..-1].lstrip
            lines_out << "#{marker}#{text0}"
            # subsequent segments
            segments[1..-1].to_a.each do |seg|
              lines_out << (' ' * marker.length) + seg.lstrip
            end
            raw_conv = lines_out.join("\n")
          end
        end
      end
    end
    # Use recovered content if available, otherwise default conversion
    if raw_conv
      raw_conv
    else
      converted = convert(li, 'list_item')
      body = converted.gsub(/\n/, "\n" + ' ' * prefix.length)
      "#{prefix}#{body}"
    end
  end.join("\n")
end

#convert_page_break(node) ⇒ Object

Render a page break directive (<<<) as blank space (skip into next page)



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# File 'lib/asciidoctor/converter/mdpp.rb', line 271

def convert_page_break(node)
  ''
end

#convert_paragraph(par) ⇒ Object

Render a paragraph. Handle inline image macros specially, otherwise process inline macros.



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# File 'lib/asciidoctor/converter/mdpp.rb', line 173

def convert_paragraph(par)
  # If this paragraph is a Markdown++ include tag, emit it raw
  if par.lines.size == 1 && par.lines.first.strip =~ /<!--\s*include:[^>]+-->/
    return par.lines.first.strip
  end
  # Process raw lines to handle trailing '+' hard breaks
  lines = par.lines.map do |line|
    l = line.chomp("\n")
    if l.rstrip.end_with?('+')
      l.chomp('+')
    else
      l
    end
  end
  text = lines.join("\n")
  # Convert any inline image macros in this paragraph
  if text.include?('image:')
    text = text.gsub(/image:(\S+?)\[([^\]]*)\]/) do
      src = Regexp.last_match(1)
      positional = []
      named = {}
      Regexp.last_match(2).split(',').map(&:strip).each do |param|
        next if param.empty?
        if param.include?('=')
          k, v = param.split('=', 2)
          v = v.gsub(/^"|"$|^'|'$/, '')
          named[k] = v
        else
          positional << param
        end
      end
      alt = positional[0] || ''
      width = named['width'] || positional[1]
      height = named['height'] || positional[2]
      style_parts = []
      if width && !width.empty?
        w = width.to_s
        style_parts << (w.end_with?('%') ? "w#{w.chomp('%')}percent" : "w#{w}")
      end
      if height && !height.empty?
        h = height.to_s
        style_parts << (h.end_with?('%') ? "h#{h.chomp('%')}percent" : "h#{h}")
      end
      style = style_parts.join
      img = "![#{alt}](#{src})"
      style.empty? ? img : "<!-- style:#{style} -->#{img}"
    end
  end
  # Convert inline xref anchors: <<id, text>> to Markdown++ links
  text = text.gsub(/<<([^,>]+),\s*([^>]+?)>>/) { "[#{$2}](##{$1})" }
  # Convert inline quoted text: *text* to bold **text**
  text = text.gsub(/\*(.+?)\*/) { "**#{$1}**" }
  text
end

#convert_preamble(preamble) ⇒ Object

Render the document preamble (blocks before the first section)



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# File 'lib/asciidoctor/converter/mdpp.rb', line 146

def convert_preamble(preamble)
  # Convert each child block in the preamble
  preamble.blocks.map { |blk| convert(blk) }.compact.join("\n\n")
end

#convert_section(sec) ⇒ Object

Render a section header, and include an explicit anchor comment if an id was set via a block anchor



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# File 'lib/asciidoctor/converter/mdpp.rb', line 152

def convert_section(sec)
  # Build the Markdown header line
  header_line = '#' * sec.level + ' ' + sec.title
  # Start with optional anchor comment for explicit anchors
  output = ''
  # Include comment only when section id was explicitly set (does not begin with auto-generated prefix)
  id = sec.id.to_s
  # Default id prefix as defined by document (defaults to '_')
  prefix = sec.document.attributes['idprefix'] || '_'
  if !id.empty? && !id.start_with?(prefix)
    output << "<!-- ##{id} -->\n"
  end
  # Add the header
  output << header_line
  # Append child blocks, separated by a blank line
  sec.blocks.each do |b|
    output << "\n\n" << convert(b)
  end
  output
end

#convert_table(node) ⇒ Object

Render a table as a Markdown++ table, handling both simple and multiline cases



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# File 'lib/asciidoctor/converter/mdpp.rb', line 441

def convert_table(node)
  # Determine Markdown++ style tag
  style = node.attr('role')
  # Fallback: simple table conversion via AST for tables with more than 2 columns
  ast_rows = node.rows
  if (ast_rows.respond_to?(:head) && ast_rows.respond_to?(:body) ? (ast_rows.head.first || []).size > 2 : (node.attr('cols') || '').split(',').size > 2)
    # AST-based simple table: pad columns to equal width
    header_cells = ast_rows.respond_to?(:head) ? (ast_rows.head.first || []) : []
    body_ast = ast_rows.respond_to?(:body) ? ast_rows.body : (begin arr = []; node.rows.each { |r| arr << r.cells }; arr.drop(1) end)
    # Extract texts
    header_texts = header_cells.map(&:text)
    body_texts   = body_ast.map { |cells| cells.map(&:text) }
    # Compute max length per column, defaulting missing entries to 0
    max_lens = header_texts.map(&:length)
    body_texts.each do |row|
      row.each_with_index do |text, idx|
        current = max_lens[idx] || 0
        max_lens[idx] = text.length if text.length > current
      end
    end
    # Column widths with padding
    widths = max_lens.map { |l| l + 2 }
    # Build header line
    hdr_cells = header_texts.each_with_index.map { |h, i| h.ljust(widths[i] - 2) }
    header_line = "| " + hdr_cells.join(' | ') + " |"
    # Build alignment line
    align_line = '|' + widths.map { |w| '-' * w }.join('|') + '|' 
    # Build body lines
    body_lines = body_texts.map do |row|
      cells = row.each_with_index.map { |text, i| text.ljust(widths[i] - 2) }
      "| " + cells.join(' | ') + " |"
    end
    # Style comment
    comment = style ? "<!-- style:#{style} -->" : ''
    return [comment, header_line, align_line, *body_lines].reject(&:empty?).join("\n")
  end
  # Locate raw source file and read lines; if file unreadable, fallback to simple AST conversion
  src_file = node.document.attr('docfile')
  begin
    src_lines = File.readlines(src_file)
  rescue
    # Fallback to simple AST-based table conversion
    header_cells = ast_rows.respond_to?(:head) ? (ast_rows.head.first || []) : []
    body_ast = ast_rows.respond_to?(:body) ? ast_rows.body : (begin arr = []; node.rows.each { |r| arr << r.cells }; arr.drop(1) end)
    header_texts = header_cells.map(&:text)
    body_texts = body_ast.map { |cells| cells.map(&:text) }
    max_lens = header_texts.map(&:length)
    body_texts.each do |row|
      row.each_with_index { |text, idx| max_lens[idx] = text.length if text.length > max_lens[idx] }
    end
    widths = max_lens.map { |l| l + 2 }
    hdr_cells = header_texts.each_with_index.map { |h, i| h.ljust(widths[i] - 2) }
    header_line = "| " + hdr_cells.join(' | ') + " |"
    align_line = '|' + widths.map { |w| '-' * w }.join('|') + '|'
    body_lines = body_texts.map do |row|
      cells = row.each_with_index.map { |text, i| text.ljust(widths[i] - 2) }
      "| " + cells.join(' | ') + " |"
    end
    comment = style ? "<!-- style:#{style} -->" : ''
    return [comment, header_line, align_line, *body_lines].reject(&:empty?).join("\n")
  end
  # If table is not fenced with grid markers, fallback to simple AST conversion
  unless src_lines.any? { |l| l.strip == '|===' }
    header_cells = ast_rows.respond_to?(:head) ? (ast_rows.head.first || []) : []
    body_ast = ast_rows.respond_to?(:body) ? ast_rows.body : (begin arr = []; node.rows.each { |r| arr << r.cells }; arr.drop(1) end)
    header_texts = header_cells.map(&:text)
    body_texts = body_ast.map { |cells| cells.map(&:text) }
    # Safe AST-based fallback: compute column widths
    max_lens = header_texts.map(&:length)
    body_texts.each do |row|
      row.each_with_index do |text, idx|
        current = max_lens[idx] || 0
        max_lens[idx] = text.length if text.length > current
      end
    end
    widths = max_lens.map { |l| (l || 0) + 2 }
    hdr_cells = header_texts.each_with_index.map { |h, i| h.ljust(widths[i] - 2) }
    header_line = "| " + hdr_cells.join(' | ') + " |"
    align_line = '|' + widths.map { |w| '-' * w }.join('|') + '|'
    body_lines = body_texts.map do |row|
      cells = row.each_with_index.map { |text, i| text.ljust(widths[i] - 2) }
      "| " + cells.join(' | ') + " |"
    end
    comment = style ? "<!-- style:#{style} -->" : ''
    return [comment, header_line, align_line, *body_lines].reject(&:empty?).join("\n")
  end
  # Identify table boundaries (fenced with |===)
  start_idx = src_lines.index { |l| l.strip == '|===' }
  end_rel = src_lines[(start_idx + 1)..-1].index { |l| l.strip == '|===' }
  end_idx = start_idx + 1 + (end_rel || 0)
  raw = src_lines[(start_idx + 1)...end_idx]
  # Parse header row
  hdr_line = raw.find { |l| l.strip.start_with?('|') }
  hdr_cols = hdr_line.strip.sub(/^\|/, '').split('|').map(&:strip)
  # Parse body rows: each '| ' marks a new row; details follow until next '|' or end
  rows = []
  body = raw.drop_while { |l| l != hdr_line }[1..] || []
  i = 0
  while i < body.size
    line = body[i]
    if line.strip.start_with?('|')
      # New row header
      header_text = line.strip.sub(/^\|/, '').chomp('+').strip
      # Collect detail lines until next row or table end
      details = []
      i += 1
      while i < body.size && !body[i].strip.start_with?('|')
        txt = body[i].rstrip
        details << txt unless txt.strip.empty?
        i += 1
      end
      rows << { header: header_text, details: details }
    else
      i += 1
    end
  end
  # Post-process details for code and admonition rows
  rows.each do |row|
    details = row[:details]
    # Code block detection
    if details.first =~ /^\[source,.*\]$/
      # Extract lines between '----' fences
      start_idx = details.index('----')
      if start_idx
        end_idx = details[(start_idx + 1)..].index('----')
        code_lines = if end_idx
                       details[(start_idx + 1)...(start_idx + 1 + end_idx)]
                     else
                       details[(start_idx + 1)..]
                     end
      else
        code_lines = details.drop(1)
      end
      row[:details] = ['```'] + code_lines + ['```']
    elsif details.first == '===='
      # Admonition block detection
      detail = details[1] || ''
      cap = detail.split(':', 2).first
      style_name = cap.downcase.capitalize
      row[:details] = ["<!-- style:Admonition#{style_name} -->", "> #{detail}"]
    end
  end
  # Compute column widths: column1 based on headers and row headers; column2 based on header and details
  col1_max = ([hdr_cols[0].length] + rows.map { |r| r[:header].length }).max
  col2_max = ([hdr_cols[1].length] + rows.flat_map { |r| r[:details].map(&:length) }).max
  widths = [col1_max + 2, col2_max + 2]
  # Build style comment: add 'multiline' if any detail contains more than one line
  tags = []
  tags << "style:#{style}" if style
  tags << 'multiline' if rows.any? { |r| r[:details].size > 1 }
  comment = tags.empty? ? '' : "<!-- #{tags.join('; ')} -->"
  # Build header and alignment rows
  header_md = "| " + hdr_cols.each_with_index.map { |h, j| h.ljust(widths[j] - 2) }.join(' | ') + " |"
  # Alignment line: adjust second column width for multiline tables
  align_parts = widths.map.with_index do |w, idx|
    '-' * (idx.zero? ? w : w + 1)
  end
  align_md = '|' + align_parts.join('|') + '|'
  # Assemble table lines
  md = []
  md << comment
  md << header_md
  md << align_md
  rows.each_with_index do |row, idx|
    # First line: header and first detail (or blank)
    md << '|' + ' ' + row[:header].ljust(widths[0] - 2) + ' | ' + (row[:details][0] || '').ljust(widths[1] - 2) + ' |'
    # Additional detail lines
    row[:details][1..].to_a.each do |det|
      md << '|' + ' ' * widths[0] + '|' + ' ' + det.ljust(widths[1] - 2) + ' |'
    end
    # Separator blank row between logical row groups
    unless idx == rows.size - 1
      # Blank separator row: adjust second column width as alignment line
      blank_parts = widths.map.with_index do |w, idx|
        ' ' * (idx.zero? ? w : w + 1)
      end
      md << '|' + blank_parts.join('|') + '|'
    end
  end
  md.join("\n")
end

#convert_thematic_break(node) ⇒ Object

Render a thematic break (''' delimited) as a horizontal rule



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# File 'lib/asciidoctor/converter/mdpp.rb', line 276

def convert_thematic_break(node)
  '---'
end

#convert_ulist(ulist) ⇒ Object

Render an unordered list with proper indentation for nested levels



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# File 'lib/asciidoctor/converter/mdpp.rb', line 229

def convert_ulist(ulist)
  # indent nested unordered lists (two spaces per nested level) only when under another list item
  if ulist.parent.respond_to?(:node_name) && ulist.parent.node_name == 'list_item'
    indent = '  ' * (ulist.level - 1)
  else
    indent = ''
  end
  # Render unordered list items, indenting nested lines, and ensure trailing newline
  ulist.items.map do |li|
    # render item and indent subsequent lines
    body = convert(li, 'list_item').gsub(/\n/, "\n#{indent}  ")
    "#{indent}- #{body}"
  end.join("\n")
end

#convert_video(node) ⇒ Object

Render a video macro as a YouTube iframe embed



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# File 'lib/asciidoctor/converter/mdpp.rb', line 281

def convert_video(node)
  # Extract video id and dimensions
  id = node.attr('target')
  width = node.attr('width')
  height = node.attr('height')
  # Build iframe embed
  lines = []
  lines << '<iframe '
  lines << "  width=\"#{width}\""
  lines << "  height=\"#{height}\""
  lines << "  src=\"https://www.youtube.com/embed/#{id}\""
  lines << '  frameborder="0"'
  lines << '  allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"'
  lines << '  allowfullscreen>'
  lines << '</iframe>'
  lines.join("\n")
end