From: Brian Candler <b.candler@...>
Date: 2008-09-16T20:46:18+09:00
Subject: Re: Getting the text (source) of a code block

> It occurs to me that the user should probably store the block as a
> heredoc or string, but that could result in code duplication later

You can use eval to turn the string into a block:

  class SrcProc
    attr_reader :src
    def initialize(src)
      @src = src
      @proc = eval "lambda #{src}"
    end
    def call(*args,&blk)
      @proc.call(*args,&blk)
    end
    alias :[] :call
  end

  block = SrcProc.new "{ |x| puts x+x }"
  block["hello,"]
  puts block.src

I believe that going in the opposite direction is much harder (google 
for 'parsetree')
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