Class: Coradoc::Markdown::Transformer

Inherits:
Parslet::Transform
  • Object
show all
Defined in:
lib/coradoc/markdown/transformer.rb

Overview

Transformer converts Parslet AST into Markdown Document Model objects.

This transformer takes the raw output from the BlockParser/InlineParser and converts it into semantic model objects (Heading, Paragraph, etc.)

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.ald_registry ⇒ Object

ALD storage - maps name to AttributeList



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# File 'lib/coradoc/markdown/transformer.rb', line 143

def ald_registry
  @ald_registry
end

Class Method Details

.apply_ial_to_element(element, ial_content) ⇒ Object

Apply IAL attributes to an element



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# File 'lib/coradoc/markdown/transformer.rb', line 355

def apply_ial_to_element(element, ial_content)
  attrs = parse_ial_content(ial_content.to_s)
  element.id = attrs[:id] if attrs[:id]
  element.classes = attrs[:classes] if attrs[:classes]
  element.attributes = attrs[:attributes] if attrs[:attributes]
  element
end

.extract_code(code_block) ⇒ Object

Extract code from code_block structure



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# File 'lib/coradoc/markdown/transformer.rb', line 430

def extract_code(code_block)
  case code_block
  when Array
    code_block.map { |l| l.is_a?(Hash) ? l[:ln].to_s : l.to_s }.join("\n")
  when Hash
    code_block[:ln].to_s
  else
    code_block.to_s
  end
end

.extract_text(content) ⇒ Object

Extract text content from nested structures



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# File 'lib/coradoc/markdown/transformer.rb', line 442

def extract_text(content)
  case content
  when Array
    content.map { |c| extract_text(c) }.join
  when Hash
    if content.key?(:text)
      content[:text].to_s
    elsif content.key?(:ln)
      content[:ln].to_s
    else
      content.values.map { |v| extract_text(v) }.join
    end
  when Parslet::Slice
    content.to_s
  else
    content.to_s
  end
end

.extract_text_from_p(p) ⇒ Object

Extract text from paragraph structure



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# File 'lib/coradoc/markdown/transformer.rb', line 418

def extract_text_from_p(p)
  case p
  when Hash
    p[:ln].to_s
  when Array
    p.map { |l| l.is_a?(Hash) ? l[:ln].to_s : l.to_s }.join("\n")
  else
    p.to_s
  end
end

.parse_extension_options(content) ⇒ Object

Parse extension options string into hash



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# File 'lib/coradoc/markdown/transformer.rb', line 370

def parse_extension_options(content)
  return {} if content.nil? || content.empty?

  result = {}
  scanner = StringScanner.new(content.strip)

  until scanner.eos?
    scanner.skip(/\s+/)
    break if scanner.eos?

    if scanner.scan(/(\w[\w-]*)\s*=\s*/)
      key = scanner[1]
      value = if scanner.scan(/"([^"\\]*)"/)
                scanner[1]
              elsif scanner.scan(/'([^'\\]*)'/)
                scanner[1]
              elsif scanner.scan(/(\S+)/)
                scanner[1]
              else
                ''
              end
      result[key] = value
    else
      # Skip unrecognized character to avoid infinite loop
      scanner.scan(/./)
    end
  end

  result
end

.parse_ial_content(content) ⇒ Object

Parse IAL content string into components Delegates to shared IalParser for consistent parsing



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# File 'lib/coradoc/markdown/transformer.rb', line 365

def parse_ial_content(content)
  ParserUtil::IalParser.parse_to_hash(content)
end

.parse_ial_element(ial_content) ⇒ Object

Parse IAL element (can be a reference or full IAL)



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# File 'lib/coradoc/markdown/transformer.rb', line 402

def parse_ial_element(ial_content)
  content = ial_content.to_s.strip
  # Check if it's just a name reference (no . or #)
  if content =~ /\A\w+\z/ && @ald_registry.key?(content)
    @ald_registry[content]
  else
    attrs = parse_ial_content(content)
    AttributeList.new(
      id: attrs[:id],
      classes: attrs[:classes],
      attributes: attrs[:attributes]
    )
  end
end

.register_ald(element) ⇒ Object

Register an ALD (Attribute List Definition)



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# File 'lib/coradoc/markdown/transformer.rb', line 209

def register_ald(element)
  name = element[:ald_name].to_s
  ial_content = element[:ial].to_s
  attrs = parse_ial_content(ial_content)
  @ald_registry[name] = AttributeList.new(name: name, **attrs)
end

.transform_definition_list(dl_content) ⇒ Object

Transform definition list



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# File 'lib/coradoc/markdown/transformer.rb', line 314

def transform_definition_list(dl_content)
  # The parser outputs term and definition as separate items
  # We need to group them: [{:def_term=>...}, {:def_content=>...}, ...]
  items = []
  current_term = nil
  current_definitions = []

  Array(dl_content).each do |item|
    next unless item.is_a?(Hash)

    if item.key?(:def_term)
      # Save previous term if exists
      if current_term
        items << DefinitionTerm.new(
          text: current_term.strip,
          definitions: current_definitions
        )
      end

      # Start new term
      current_term = extract_text(item[:def_term])
      current_definitions = []
    elsif item.key?(:def_content)
      # Add definition to current term
      content = extract_text(item[:def_content])
      current_definitions << DefinitionItem.new(content: content.strip)
    end
  end

  # Don't forget the last term
  if current_term
    items << DefinitionTerm.new(
      text: current_term.strip,
      definitions: current_definitions
    )
  end

  DefinitionList.new(items: items)
end

.transform_document(ast) ⇒ Coradoc::Markdown::Document

Transform AST into a Document model

Parameters:

  • ast (Array) —

    The parsed AST from BlockParser

Returns:



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# File 'lib/coradoc/markdown/transformer.rb', line 149

def transform_document(ast)
  @ald_registry = {}
  blocks = Array(ast).map { |element| transform_element(element) }.compact
  Document.new(blocks: blocks)
end

.transform_element(element) ⇒ Object

Transform a single element



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# File 'lib/coradoc/markdown/transformer.rb', line 156

def transform_element(element)
  return nil if element.nil?

  case element
  when Hash
    # Handle ALD first (register it)
    if element.key?(:ald_name)
      register_ald(element)
      return nil
    end

    # Handle IAL on its own line (reference or standalone)
    if element.key?(:ial) && !element.key?(:p) && !element.key?(:heading)
      ial = parse_ial_element(element[:ial])
      # Check if it's a reference to an ALD
      return @ald_registry[ial] if ial.is_a?(String) && @ald_registry.key?(ial)

      return ial
    end

    # Handle extension
    return transform_extension(element[:extension]) if element.key?(:extension)

    # Handle extension (direct key)
    return transform_extension(element) if element.key?(:ext_name)

    # Handle math
    return Math.block(extract_text(element[:math_content])) if element.key?(:math_content)

    # Handle footnote reference (inline)
    return FootnoteReference.new(id: element[:fn_ref].to_s) if element.key?(:fn_ref)

    # Try to transform using rules
    transformed = try_transform(element)
    return transformed if transformed

    # If no rule matches, try to extract text
    if element.key?(:ln)
      Paragraph.new(text: element[:ln].to_s)
    elsif element.key?(:text)
      Text.new(content: element[:text].to_s)
    end
  when Array
    # Transform each item
    element.map { |e| transform_element(e) }.compact
  when Parslet::Slice
    Text.new(content: element.to_s)
  else
    Text.new(content: element.to_s)
  end
end

.transform_extension(element) ⇒ Object

Transform extension element



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# File 'lib/coradoc/markdown/transformer.rb', line 217

def transform_extension(element)
  name = element[:ext_name].to_s
  opts = element[:ext_options]
  # Handle empty array from parser
  options = if opts.is_a?(Array) && opts.empty?
              {}
            elsif opts
              parse_extension_options(opts.to_s)
            else
              {}
            end
  body = element[:ext_body]

  Extension.new(
    name: name,
    options: options,
    content: body&.to_s
  )
end

.try_transform(element) ⇒ Object

Try to transform using the defined rules



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# File 'lib/coradoc/markdown/transformer.rb', line 238

def try_transform(element)
  return nil unless element.is_a?(Hash)

  # Check for known patterns and transform them
  if element.key?(:heading)
    level = element[:heading].to_s.length
    text = element[:text] ? element[:text].to_s.strip : ''
    heading = Heading.new(level: level, text: text)
    # Apply IAL if present
    apply_ial_to_element(heading, element[:ial]) if element.key?(:ial)
    return heading
  end

  return HorizontalRule.new(style: '---') if element.key?(:hr)

  # Fenced code block with language info
  if element.key?(:info) && element.key?(:code_block)
    language = element[:info].to_s.strip
    code = extract_code(element[:code_block])
    code_block = CodeBlock.new(language: language, code: code)
    apply_ial_to_element(code_block, element[:ial]) if element.key?(:ial)
    return code_block
  end

  if element.key?(:code_block)
    code = extract_code(element[:code_block])
    code_block = CodeBlock.new(code: code)
    apply_ial_to_element(code_block, element[:ial]) if element.key?(:ial)
    return code_block
  end

  if element.key?(:block_quote)
    content = element[:block_quote]
    transformed = content.is_a?(Array) ? content.map { |c| transform_element(c) } : [transform_element(content)]
    text = transformed.compact.map do |c|
      c.is_a?(Base) && c.class.attributes.key?(:text) ? c.text : c.to_s
    end.join("\n")
    blockquote = Blockquote.new(content: text)
    apply_ial_to_element(blockquote, element[:ial]) if element.key?(:ial)
    return blockquote
  end

  if element.key?(:p)
    text = extract_text_from_p(element[:p])
    paragraph = Paragraph.new(text: text)
    apply_ial_to_element(paragraph, element[:ial]) if element.key?(:ial)
    return paragraph
  end

  # Definition list
  return transform_definition_list(element[:dl]) if element.key?(:dl)

  # Footnote definition
  if element.key?(:fn_id)
    content = if element[:fn_content_continued]
                lines = [element[:fn_content]]
                lines += Array(element[:fn_content_continued])
                lines.map { |l| extract_text(l) }.join("\n")
              else
                extract_text(element[:fn_content])
              end
    return Footnote.new(id: element[:fn_id].to_s, content: content.strip)
  end

  # Abbreviation definition
  if element.key?(:abbr_term)
    return Abbreviation.new(
      term: element[:abbr_term].to_s,
      definition: element[:abbr_def].to_s.strip
    )
  end

  nil
end