Class: EPUB::Parser::ContentDocument

Inherits:
Object
  • Object
show all
Defined in:
lib/epub/parser/content_document.rb

Instance Method Summary collapse

Constructor Details

#initialize(item) ⇒ ContentDocument

Returns a new instance of ContentDocument.

Parameters:



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# File 'lib/epub/parser/content_document.rb', line 11

def initialize(item)
  @item = item
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/epub/parser/content_document.rb', line 15

def parse
  content_document = case @item.media_type
                     when 'application/xhtml+xml'
                       if @item.nav?
                         EPUB::ContentDocument::Navigation.new
                       else
                         EPUB::ContentDocument::XHTML.new
                       end
                     when 'image/svg+xml'
                       EPUB::ContentDocument::SVG.new
                     else
                       nil
                     end
  return content_document if content_document.nil?
  content_document.item = @item
  document = XMLDocument.new(@item.read)
  # parse_content_document(document)
  if @item.nav?
    content_document.navigations = parse_navigations(document)
  end
  content_document
end

#parse_navigation(element) ⇒ EPUB::ContentDocument::Navigation::Navigation

Returns nav Navigation object.

Parameters:

  • element (REXML::Element, Oga::XML::Element, Nokogiri::XML::Element) —

    nav element

Returns:



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# File 'lib/epub/parser/content_document.rb', line 46

def parse_navigation(element)
  nav = EPUB::ContentDocument::Navigation::Navigation.new
  nav.text = find_heading(element)
  hidden = element.attribute_with_prefix('hidden')
  nav.hidden = hidden.nil? ? nil : true
  nav.types = element.attribute_with_prefix('type', 'epub')&.split(/\s+/)
  element.each_element_by_xpath('./xhtml:ol/xhtml:li', EPUB::NAMESPACES).map do |elem|
    nav.items << parse_navigation_item(elem)
  end

  nav
end

#parse_navigation_item(element) ⇒ Object

Parameters:

  • element (REXML::Element, Oga::XML::Element, Nokogiri::XML::Element) —

    li element



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# File 'lib/epub/parser/content_document.rb', line 60

def parse_navigation_item(element)
  item = EPUB::ContentDocument::Navigation::Item.new
  a_or_span = element.each_element_by_xpath('./xhtml:a[1]|xhtml:span[1]', EPUB::NAMESPACES).first
  return a_or_span if a_or_span.nil?

  item.text = a_or_span.content
  item.types = a_or_span.attribute_with_prefix('type', 'epub')&.split(/\s+/)
  if a_or_span.name == 'a'
    if item.text.empty?
      embedded_content = a_or_span.each_element_by_xpath('./xhtml:audio[1]|xhtml:canvas[1]|xhtml:embed[1]|xhtml:iframe[1]|xhtml:img[1]|xhtml:math[1]|xhtml:object[1]|xhtml:svg[1]|xhtml:video[1]', EPUB::NAMESPACES).first
      unless embedded_content.nil?
        case embedded_content.name
        when 'audio', 'canvas', 'embed', 'iframe'
          item.text = embedded_content.attribute_with_prefix('name') || embedded_content.attribute_with_prefix('srcdoc')
        when 'img'
          item.text = embedded_content.attribute_with_prefix('alt')
        when 'math', 'object'
          item.text = embedded_content.attribute_with_prefix('name')
        when 'svg', 'video'
        else
        end
      end
      item.text = a_or_span.attribute_with_prefix('title').to_s if item.text.nil? || item.text.empty?
    end
    item.href = a_or_span.attribute_with_prefix('href')
    item.item = @item.find_item_by_relative_iri(item.href)
  end
  item.items = element.each_element_by_xpath('./xhtml:ol[1]/xhtml:li', EPUB::NAMESPACES).map {|li| parse_navigation_item(li)}

  item
end

#parse_navigations(document) ⇒ Array<EPUB::ContentDocument::Navigation::Navigation>

Returns navs array of Navigation object.

Parameters:

  • document (XMLDocument, REXML::Document, Oga::XML::Document, Nokogiri::HTML::Document) —

    HTML document or element including nav

Returns:



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# File 'lib/epub/parser/content_document.rb', line 40

def parse_navigations(document)
  document.each_element_by_xpath('/xhtml:html/xhtml:body//xhtml:nav', EPUB::NAMESPACES).collect {|elem| parse_navigation elem}
end