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Contents
#!/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 provide a regular expression that will be
# used to look for words that look like the numbers you expect in the
# page content.
require 'rubygems'
require 'pdf/reader'
class BatesReceiver
def initialize(regexp = nil)
@numbers = []
@backup = []
@regexp = regexp
end
def numbers
@numbers.size > 0 ? @numbers : @backup
end
# Called when page parsing starts
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
# record text that is drawn on the page
def show_text(string, *params)
return if @regexp.nil?
string.scan(@regexp).each { |m| @backup << m }
end
# there's a few text callbacks, so make sure we process them all
alias :super_show_text :show_text
alias :move_to_next_line_and_show_text :show_text
alias :set_spacing_next_line_show_text :show_text
# this final text callback takes slightly different arguments
def show_text_with_positioning(*params)
params = params.first
params.each { |str| show_text(str) if str.kind_of?(String)}
end
end
receiver = BatesReceiver.new(/CC.+/)
PDF::Reader.file("bates.pdf", receiver)
puts receiver.numbers.inspect
Version data entries
14 entries across 14 versions & 1 rubygems