From: Robert Klemme <bob.news@...>
Date: 2004-06-07T17:18:47+09:00
Subject: Re: Check assertion in Ruby

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"Jean-Hugues ROBERT" <jean_hugues_robert@yahoo.com> schrieb im Newsbeitrag
news:6.0.1.1.0.20040605205551.01e159b0@pop.mail.yahoo.com...

> >Seriously, who needs CPP when there is Ruby?
> >
> >def load_special(file)
> >  if DEBUG
> >    load file
> >  else
> >    Object.new.instance_eval File.read(file).gsub(/^\s*assert\b/m,
'#' )
> >  end
> >end
> >Regards
> >    robert
>
> Cool !
> Now. What about multi-lines asserts ?

Can't be done with the simple code above.

> If that helps I may concede a end-of-xxx marker.

Well, the proper way would be to write a parser for a macro language.  You
can get quite far with a simple hack like the one attached, although that
does only support nested macro invocations without using () for sub
macros.  (Reason is that you can't parse nested brackets with regular
expressions.)

Have fun

    robert

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#!/usr/bin/ruby

require 'macro'

MACRO.load "test.rbm"

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#DEFMACRO foo(a,b)
  p a
  p b
  "\"#{a + b}\""
#ENDMACRO

puts "foo"
puts MACRO.foo( "x", "y" )

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module MACRO
  def self.load(file)
    contents = File.read(file)

    buffer = nil
    raw = ""

    contents.each_line do |line|
      case line
        when /\A\s*#DEFMACRO\s+\b(.*)\Z/
          buffer = "def self.#{$1}\n"
        when /\A\s*#ENDMACRO\s*\Z/
          buffer << "end\n"
          # puts "DEFINING MACRO", buffer
          self.instance_eval buffer
          buffer = nil
        else
          if buffer
            buffer << line
          else
            raw << line
          end
      end
    end

    Object.new.instance_eval( raw.gsub( /MACRO.\w+\([^)]*\)/m ) do |m|
      instance_eval m
    end )
  end
end

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