From: Aldric Giacomoni <aldric@...>
Date: 2010-04-16T21:42:35+09:00
Subject: Re: Writing a parser

Martin Hansen wrote:
> Hello there,
> 
> I am struggling to get a grip on OO (and Ruby) and write a parser for
> this particular data format described at the below get_record method.
> The goal is to parse and emit records of this type and be able to
> manipulate these with the methods in class Hash.
> 
> For now I am trying to get parsing to work, and the problem here is,
> that the add methods is not defined for Hash. What is the best way of
> doing that?
> 
>     record = {}
>      block.each_line do |line|
>       fields = line.split(": ")
>       raise ArgumentError, "Bad record line: #{line}" if fields.length
> != 2
> 
>       record.add(fields[0],fields[1])
>     end

irb(main):001:0> record = {}
=> {}
irb(main):002:0> record[:name] = "Doe, John"
=> "Doe, John"
irb(main):003:0> record[:eye_color] = "Blue"
=> "Blue"
irb(main):004:0> record[:age] = 5
=> 5
irb(main):005:0> record
=> {:age=>5, :name=>"Doe, John", :eye_color=>"Blue"}
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