Class: OpenStax::Content::FragmentSplitter

Inherits:
Object
  • Object
show all
Defined in:
lib/openstax/content/fragment_splitter.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(processing_instructions, reference_view_url) ⇒ FragmentSplitter

Returns a new instance of FragmentSplitter.



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# File 'lib/openstax/content/fragment_splitter.rb', line 8

def initialize(processing_instructions, reference_view_url)
  @processing_instructions = processing_instructions.map do |processing_instruction|
    OpenStruct.new(processing_instruction.to_h).tap do |pi_struct|
      pi_struct.fragments = [pi_struct.fragments].flatten.map do |fragment|
        fragment.to_s.split('_').map(&:capitalize).join
      end unless pi_struct.fragments.nil?
      pi_struct.only = [pi_struct.only].flatten.map(&:to_s) unless pi_struct.only.nil?
      pi_struct.except = [pi_struct.except].flatten.map(&:to_s) unless pi_struct.except.nil?
    end
  end

  @reference_view_url = reference_view_url
end

Instance Attribute Details

#processing_instructions ⇒ Object (readonly)

Returns the value of attribute processing_instructions.



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# File 'lib/openstax/content/fragment_splitter.rb', line 6

def processing_instructions
  @processing_instructions
end

#reference_view_url ⇒ Object (readonly)

Returns the value of attribute reference_view_url.



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# File 'lib/openstax/content/fragment_splitter.rb', line 6

def reference_view_url
  @reference_view_url
end

Instance Method Details

#split_into_fragments(root, type = nil) ⇒ Object

Splits the given root node into fragments according to the processing instructions



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# File 'lib/openstax/content/fragment_splitter.rb', line 23

def split_into_fragments(root, type = nil)
  result = [root.dup]
  type_string = type.to_s

  pis = processing_instructions.reject do |processing_instruction|
    processing_instruction.css.nil? ||
    processing_instruction.css.empty? ||
    processing_instruction.fragments.nil? ||
    processing_instruction.fragments == ['Node'] ||
    (!processing_instruction.only.nil? && !processing_instruction.only.include?(type_string)) ||
    (!processing_instruction.except.nil? && processing_instruction.except.include?(type_string))
  end

  @media_nodes = []

  pis.each { |processing_instruction| result = process_array(result, processing_instruction) }

  # Flatten, remove empty nodes and transform remaining nodes into reading fragments
  result.map do |obj|
    next obj unless obj.is_a?(Nokogiri::XML::Node)

    fragment = OpenStax::Content::Fragment::Reading.new(
      node: obj, reference_view_url: reference_view_url
    )
    fragment unless fragment.blank?
  end.compact.tap do |result|
    @media_nodes.each do |node|
      # Media processing instructions
      node.css('[id], [name]', custom_css).each do |linkable|
        css_array = []
        css_array << "[href$=\"##{linkable[:id]}\"]" unless linkable[:id].nil?
        css_array << "[href$=\"##{linkable[:name]}\"]" unless linkable[:name].nil?
        css = css_array.join(', ')

        result.select(&:html?)
              .select { |fragment| fragment.has_css? css, custom_css }
              .each   { |fragment| fragment.append node.dup }
      end
    end

    result.select(&:html?).each(&:transform_links!)
  end
end