Module: PdfExtract::Regions

Defined in:
lib/model/regions.rb

Class Method Summary collapse

Class Method Details

.append_line_offsets(region) ⇒ Object 



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# File 'lib/model/regions.rb', line 27

def self.append_line_offsets region
  region[:lines] ||= []
  region[:lines].each do |line|
    line[:x_offset] = line[:x] - region[:x]
    line[:y_offset] = line[:y] - region[:y]
  end
end

.append_line_spacing(region) ⇒ Object 



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# File 'lib/model/regions.rb', line 35

def self.append_line_spacing region
  region[:lines] ||= []
  height_taken = 0
  region[:lines].each do |line|
    from_top = region[:height] - (line[:y_offset] + line[:height])
    line[:spacing] = from_top - height_taken
    height_taken = from_top + line[:height]
  end
end

.incident(l, r) ⇒ Object

TODO Handle :writing_mode once present in characters and text_chunks.



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# File 'lib/model/regions.rb', line 15

def self.incident l, r
  lx1 = l[:x]
  lx2 = l[:x] + l[:width]
  rx1 = r[:x]
  rx2 = r[:x] + r[:width]

  lr = (lx1..lx2)
  rr = (rx1..rx2)

  lr.include? rx1 or lr.include? rx2 or rr.include? lx1 or rr.include? lx2
end

.include_in(pdf) ⇒ Object 



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# File 'lib/model/regions.rb', line 45

def self.include_in pdf
  pdf.spatials :regions, :paged => true, :depends_on => [:chunks] do |parser|
    chunks = []
    regions = []

    parser.before do
      chunks = []
      regions = []
    end

    parser.objects :chunks do |chunk|
      y = chunk[:y].floor

      idx = chunks.index { |obj| chunk[:y] <= obj[:y] }
      if idx.nil?
        chunks << chunk.dup
      else
        chunks.insert idx, chunk.dup
      end
    end

    # TODO Rewrite to use Spatial::collapse so that text is in proper
    # order.

    parser.after do
      # Convert chunks to have line content.
      chunks.each do |chunk|
        chunk[:lines] = [Spatial.as_line(chunk)]
        chunk.delete :content
      end

      compare_index = 1
      while chunks.count > compare_index
        b = chunks.first
        t = chunks[compare_index]

        line_height = b[:line_height]
        line_slop = [line_height, t[:height]].min * pdf.settings[:line_slop]
        incident_y = (b[:y] + b[:height] + line_slop) >= t[:y]

        if incident_y && incident(t, b)
          chunks[0] = Spatial.merge t, b, :lines => true
          chunks.delete_at compare_index
          compare_index = 1
        elsif compare_index < chunks.count - 1
          # Could be more chunks within range.
          compare_index = compare_index.next
        else
          # Finished region.
          regions << chunks.first
          chunks.delete_at 0
          compare_index = 1
        end
      end

      regions << chunks.first unless chunks.first.nil?

      regions.each do |region|
        append_line_offsets region
        append_line_spacing region

        region[:lines].map! do |line|
          Spatial.drop_spatial line
        end
      end

      regions.sort_by { |obj| -obj[:y] }
    end
  end
end