Module: PdfExtract::Titles

Defined in:
lib/analysis/titles.rb

Class Method Summary collapse

Class Method Details

.include_in(pdf) ⇒ Object 



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# File 'lib/analysis/titles.rb', line 12

def self.include_in pdf
  pdf.spatials :titles, :depends_on => [:regions] do |parser|
    titles = []
    
    parser.objects :regions do |region|
      titles << region
    end

    parser.after do
      # A title should:
      #   be longer than one letter,
      titles.reject! { |r| Spatial.get_text_content(r).strip.length < 2}

      #   be in the top half of a page,
      titles.reject! { |r| r[:y] < (r[:page_height] / 2.0) }

      #   be no less tall than a factor of the tallest text,
      titles.sort_by! { |r| -r[:line_height] }
      tallest_line = titles.first[:line_height]
      title_slop = tallest_line - (tallest_line * pdf.settings[:title_slop])
      titles.reject! { |r| r[:line_height] < title_slop }
      
      #   be on the earliest page with text,
      titles.sort_by! { |r| r[:page] }
      first_page = titles.first[:page]
      titles.reject! { |r| r[:page] != first_page }

      #   be the highest of the above.
      titles.sort_by! { |r| -r[:y] }

      if titles.count.zero?
        []
      else
        {
          :content => Spatial.get_text_content(titles.first),
          :line_height => titles.first[:line_height],
          :font => titles.first[:font]
        }
      end
    end
  end
end