From: Dave Thomas <Dave@...>
Date: 2001-09-24T21:27:35+09:00
Subject: [ruby-talk:21629] Re: Please translate this easy snip of C++ to Ruby

Carlos <angus@quovadis.com.ar> writes:

> Yes, I think easier. Based on what you said about how it is done in Python
> and on Dave's solution, here is a simple, poorly tested approach:
> 
> ---
> def trace_(&b)
> 	file,line_nr=caller()[0].split(':')
> 	line_nr=line_nr.to_i
> 	linecnt=1
> 	expr=nil
> 	File.open(file).each_line do |line|
> 		if linecnt==line_nr
> 			if line =~ /(^|\W)trace_\s*{\s*(.*?)\s*}/
> 				expr = $2
> 			end
> 			break
> 		end
> 		linecnt+=1
> 	end
> 	if expr
> 		puts "#{expr}: #{eval(expr, b).inspect}"
> 	end
> end

Why not just 'yield' to get the value of the block in this case? I
don't think the 'eval' is needed.


Dave