From: Trans <transfire@...>
Date: 2007-01-14T11:15:20+09:00
Subject: Re: return_on


Daniel Finnie wrote:
> I have made the most hackish thing to accomplish this.  It is basically
> a regexp-supporting preprocessor.  I don't recommend using it.
>
> #! /usr/bin/ruby -w
>
> def preprocessor_define(*args, &blk)
> 	# Determine line of caller
> 	callerLine = caller.join.match(/[0-9]+/)[0].to_i
>
> 	# Get the source of the running file
> 	source = IO.read(__FILE__)
>
> 	# Remove the callerLine line
> 	source = source.split("\n")
> 	source.delete_at(callerLine - 1)
> 	source = source.join("\n")
>
> 	# Do the replacement
> 	source.gsub!(*args, &blk)
>
> 	# Avoid function redefinition warnings
> 	newName = ""
> 	50.times {newName << (rand(26) + 65).chr }
> 	source.gsub!("preprocessor_define", newName)
>
> 	# Run the replacement
> 	#puts source
> 	eval source
> 	exit
> end
>
> preprocessor_define(/return_on (.*)/) {|s| "return #{s[1]} unless
> #{s[1]}.nil?"}
>
> def test
> 	zulu = 5
> 	return_on zulu
> 	puts "Broken."
> end
> test
>
> Output: None, as 'puts Broken' never gets executed.

Holy Smokes! The Man goes out of his way!!! return_on brother,
return_on! :-)

T.