From: 7stud -- <bbxx789_05ss@yahoo.com>
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Subject: Re: Making a simple parser
Date: Sat, 16 Apr 2011 22:31:41 -0500
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Felipe Balbi wrote in post #993252:
> Hi all,
>
> To automate some of the tests I have to run, I decided to use ruby to
> generate some script files on a particular (very simple) language based
> on several possible input files. My first approach at this was to use
> inherited method on a parent class (which I called InputFormat) to hold
> all the children in an array. Then, different formats could become a
> child class of InputFormat and return a known data format (I decided to
> use an array of hashes because the output is really really simple) to
> the output generator code.
>
> So the idea is something like:
>
> class InputFormat
>   @children = []
>
>   def initialize(input)
>     @input = input
>   end
>
>   def parse
>     @children.each { |child|
>       child.parse(@input) if child.supported?(@input)
>     }
>   end
>
>   def self.inherited(child)
>     @children << child
>   end
> end
>
> class AInputFormat < InputFormat
>   def supported?
>     # check if we can parse this type of file
>   end
>
>   def parse
>     # parse and generate array of hashes in known format
>   end
> end
>
>
> Then on the core file I would have something like:
>
> input = InputFormat.new(ARGV[0])
> input.parse
>
> As it turns out, this isn't working because AInputFormat will only
> inherit from InputFormat at the time I actually use it, am I right ?
>

No:

1)
class A
  def self.inherited(child)
    puts 'inherited called'
  end
end

class B < A
end

--output:--
inherited called


2)
class A
  def self.inherited(child)
    puts 'inherited called'
  end
end

B = Class.new(A)

--output:--
inherited called

> possible input formats generate one output format)

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