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#!/usr/bin/env ruby
# coding: utf-8
# A sample script that attempts to extract bates numbers from a PDF file.
# Bates numbers are often used to markup documents being used in legal
# cases. For more info, see http://en.wikipedia.org/wiki/Bates_numbering
#
# Acrobat 9 introduced a markup syntax that directly specifies the bates
# number for each page. For earlier versions, the easiest way to find
# the number is to look for words that match a pattern.
#
# This example attempts to extract numbers using the Acrobat 9 syntax.
# As a fall back, you can use a regular expression to look for words
# that match the numbers you expect in the page content.
require 'pdf/reader'
class BatesReceiver
attr_reader :numbers
def initialize
@numbers = []
end
def begin_marked_content(*args)
return unless args.size >= 2
return unless args.first == :Artifact
return unless args[1][:Subtype] == :BatesN
@numbers << args[1][:Contents]
end
alias :begin_marked_content_with_pl :begin_marked_content
end
filename = File.expand_path(File.dirname(__FILE__)) + "/../spec/data/cairo-basic.pdf"
PDF::Reader.open(filename) do |reader|
reader.pages.each do |page|
receiver = BatesReceiver.new
page.walk(receiver)
if receiver.numbers.empty?
puts page.text.scan(/CC.+/)
else
puts receiver.numbers.inspect
end
end
end
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