Module: Metanorma::Html::Concerns::TextExtraction

Included in:
BaseRenderer
Defined in:
lib/metanorma/html/concerns/text_extraction.rb

Overview

Plain-text extraction from model nodes, mixed into BaseRenderer. Used wherever rendered output needs a text-only form (titles, labels, captions, ToC entries). Walks element_order and typed attributes directly on the model — never strips tags from rendered HTML.

Instance Method Summary collapse

Instance Method Details

#extract_plain_text(node) ⇒ Object 



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# File 'lib/metanorma/html/concerns/text_extraction.rb', line 12

def extract_plain_text(node)
  return node.to_s if node.is_a?(String)
  return extract_text_value(node).to_s unless node.is_a?(Lutaml::Model::Serializable)

  parts = []
  xml_mapping = node.class.mappings_for(:xml, node.lutaml_register)

  if node.element_order.is_a?(Array) && xml_mapping
    element_to_attr =
      Renderers::ElementOrderTraversal.element_to_attr_map(xml_mapping)

    indices = Hash.new(0)
    node.element_order.each do |el|
      next unless el.is_a?(Lutaml::Xml::Element)

      if el.text?
        parts << el.text_content.to_s
      elsif el.name == "tab"
        parts << " "
      # rubocop:disable Lint/DuplicateBranch
      elsif el.name == "br"
        parts << " "
      # rubocop:enable Lint/DuplicateBranch
      elsif el.element?
        attr_name = element_to_attr[el.name]
        if attr_name
          coll = node.public_send(attr_name)
          obj = if coll.is_a?(Array)
                  idx = indices[attr_name]
                  indices[attr_name] += 1
                  coll[idx]
                else
                  coll
                end
          text = extract_plain_text(obj)
          parts << (text.empty? ? " " : text)
        elsif el.name == "span"
          parts << " "
        end
      end
    end
  end

  if parts.join.strip.empty?
    t = safe_attr(node, :text)
    parts << (t.is_a?(Array) ? t.join : t.to_s) if t
  end

  parts.join.strip.gsub(" ", " ")
end

#extract_text_value(val) ⇒ Object 



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# File 'lib/metanorma/html/concerns/text_extraction.rb', line 63

def extract_text_value(val)
  return nil if val.nil?
  return val if val.is_a?(String)

  if val.is_a?(Array)
    val.map { |v| extract_text_value(v) }.join
  elsif val.is_a?(Lutaml::Model::Serializable)
    c = safe_attr(val, :content)
    if c && !c.equal?(val)
      extract_text_value(c)
    else
      t = safe_attr(val, :text)
      if t
        extract_text_value(t)
      else
        v = safe_attr(val, :value)
        if v
          extract_text_value(v)
        else
          val.to_s
        end
      end
    end
  else
    val.to_s
  end
end