Parsing de disciplinas da matrícula da UFABC. Requer a gem pdf-parser

parser.rb

require 'rubygems'
require 'pdf/reader'
require "re_parser"
require "yaml"

class PageTextReceiver
  attr_accessor :disciplinas

  def initialize
    @disciplinas = ReParser.new
  end

  # Called when page parsing starts
  def begin_page(arg = nil)
  end

  # record text that is drawn on the page
  def show_text(string, *params)
  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, *other)
    str = ''
    params.each_with_index { |s, i| str << s if i.even? }
    @disciplinas.parse str
    p @disciplinas.disciplinas.last
  end
end

receiver = PageTextReceiver.new
pdf = PDF::Reader.file("disciplinas_ofertadas_2011_2", receiver)

File.open "disciplinas.yml", "w" do |f|
  f.print receiver.disciplinas.disciplinas.collect { |b| Hash[*b.members.zip(b.values).flatten(1)] }.to_yaml
end

re_parser.rb

Disciplina = Struct.new :codigo, :nome, :turma, :turno, :t, :p, :i, :horarios, :campus, :cat_bct, :cat_bch

class ReParser
  attr_reader :disciplinas

  def initialize
    @disciplinas = []
    @cont = 0
  end

  def parse(string)
    string.chop
    if string =~ /^\w{2}\d{4}$/
      @cont = 0
      @disciplinas << Disciplina.new(string)
    elsif @disciplinas.last
      @cont += 1
      parse_other(string, @disciplinas.last)
    end
  end

  def parse_other(string, disciplina)
    case @cont
      when 1
        disciplina.nome = string
      when 2
        if string !~ /^\w\d?$/
          @cont -= 1
          disciplina.nome << string
        else
          disciplina.turma = string
        end
      when 3 then disciplina.turno = string
      when 4 then disciplina.t = string
      when 5 then disciplina.p = string
      when 6 then disciplina.i = string
      when 7
        disciplina.horarios ||= []
        disciplina.horarios << string.gsub(/,\s*/, '')
      when 8
        if ["SA", "SB"].include?(string)
          disciplina.campus = string
        else
          @cont -= 1
          parse_other(string, disciplina)
        end
      when 9
      when 10
        #if string =~ /limitada/
        disciplina.cat_bct = string
      when 11
        if string =~ /limitada/
          disciplina.cat_bct << string
          @cont -= 1
        else
          disciplina.cat_bch = string
        end
      when 12
        disciplina.cat_bch << string if string =~ /li/
    end
  end
end