Class: EPUB::Searcher::XHTML::Seamless

Inherits:
EPUB::Searcher::XHTML show all
Defined in:
lib/epub/searcher/xhtml.rb

Constant Summary

Constants inherited from EPUB::Searcher::XHTML

ALGORITHMS

Instance Method Summary collapse

Methods inherited from EPUB::Searcher::XHTML

search_text

Constructor Details

#initialize(element) ⇒ Seamless

Returns a new instance of Seamless.



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# File 'lib/epub/searcher/xhtml.rb', line 62

def initialize(element)
  super
  @indices = nil
end

Instance Method Details

#build_indices(element) ⇒ Object 



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# File 'lib/epub/searcher/xhtml.rb', line 74

def build_indices(element)
  indices = {}
  content = ''

  elem_index = 0
  element.children.each do |child|
    if child.element?
      child_step = [:element, elem_index, {:name => child.name, :id => child.attribute_with_prefix('id')}]
      elem_index += 1
      if child.name == 'img'
        alt = child.attribute_with_prefix('alt')
        next if alt.nil? || alt.empty?
        indices[content.length] = [child_step]
        content << alt
      else
        # TODO: Consider block level elements
        content_length = content.length
        sub_indices, sub_content = build_indices(child)
        # TODO: Pass content_length and child_step to build_indices and remove this block
        sub_indices.each_pair do |sub_pos, child_steps|
          indices[content_length + sub_pos] = [child_step] + child_steps
        end
        content << sub_content
      end
    elsif child.text? || child.cdata?
      text_index = elem_index
      text_step = [:text, text_index]
      indices[content.length] = [text_step]
      content << child.content
    end
  end

  [indices, content]
end

#search_text(word) ⇒ Object 



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# File 'lib/epub/searcher/xhtml.rb', line 67

def search_text(word)
  unless @indices
    @indices, @content = build_indices(@element)
  end
  visit(@indices, @content, word)
end