Class: DragonflyPdf::Analysers::PdfProperties

Inherits:
Object
  • Object
show all
Defined in:
lib/dragonfly_pdf/analysers/pdf_properties.rb

Instance Method Summary collapse

Instance Method Details

#call(content, options = {}) ⇒ Object 



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# File 'lib/dragonfly_pdf/analysers/pdf_properties.rb', line 4

def call(content, options = {})
  box_type = options.fetch :box_type, 'TrimBox'

  box_data = []
  rotate_data = []
  IO.foreach(content.path, "\n\n", encoding: "ISO-8859-1") do |item|
    box_data += item.scan(/(MediaBox|CropBox|BleedBox|TrimBox)\s?\[([\d\.]+?)\s([\d\.]+?)\s([\d\.]+?)\s([\d\.]+?)\]/)
    rotate_data += item.scan(/\/Rotate\s(\d+?)\s/)
  end

  # drop last value, since that comes from data about all pages
  media_box = box_data.select { |d| d.first == 'MediaBox' }[0..-2]
  desired_box = box_data.select { |d| d.first == box_type }

  page_dimensions = (desired_box.length > 0 ? desired_box : media_box).map do |dim|
    i = dim[1..-1].map(&:to_f).map{ |d| pt2mm(d) }
    [ i[2]-i[0], i[3]-i[1] ]
  end

  page_count = page_dimensions.count
  aspect_ratios = page_dimensions.inject([]) { |res, page| res << (page.first / page.last) }
  page_numbers = (1..page_count).to_a
  page_rotations = rotate_data.flatten.map(&:to_f)

  {
    aspect_ratios: aspect_ratios,
    page_count: page_count,
    page_dimensions: page_dimensions,
    page_numbers: page_numbers,
    page_rotations: page_rotations
  }
end