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From: jake kaiden <jakekaiden@yahoo.com>
Newsgroups: comp.lang.ruby
Subject: Re: Making a simple parser
Date: Sun, 17 Apr 2011 12:01:47 -0500
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hi felipe,

  well, i don't know how many possible input types you have, but if
they're not too very many, you could try a very different approach:

## for this test i created three files, "input.eng," "input.esp," and
"input.fr," each with a few lines of random text...

class Parser
  attr_reader :output
  def initialize(inputfile)
  @output = [] ## this can of course be changed to what best suits your 
purposes
  @oktypes = %W[.eng .esp .fr]
  self.checkType(inputfile)
  end

  def checkType(file)
    if File.exists?(file)
  if ! @oktypes.include?(File.extname(file))
    puts "Unrecognized File Type"
  else
    @oktypes.collect{|type|
    case
    when file.downcase.include?(type)
      self.parseInput(file)
      false
    end
    }
  end
    else
  puts "File Not Found"
    end
  end

  def parseInput(file)
    case
  when file.downcase.include?(".eng")
    self.engParse(file)
  when file.downcase.include?(".esp")
    self.espParse(file)
  when file.downcase.include?(".fr")
    self.frParse(file)
    end
  end

  def loadData(inputfile)
    @data = []
    file = File.open(inputfile, 'r')
    file.collect{|line| @data << line.chomp}
    file.close
  end

## here's where you do whatever parsing you need to, my examples are
dumb... but the important thing is that you end up with @output

  def engParse(file)
    self.loadData(file)
    @data.collect{|line|
  @output << line.reverse}
  end

  def espParse(file)
    self.loadData(file)
    @data.collect{|line|
  @output << line.upcase}
  end

  def frParse(file)
    self.loadData(file)
    @data.collect{|line|
  @output << line.upcase.reverse}
  end

end #class


test = Parser.new("input.esp")
puts test.output

  this may be WAY too simple for what you're trying to do, but hey,
maybe not! ;)

 - j

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