From: Joel VanderWerf <vjoel@...>
Date: 2002-11-12T05:30:46+09:00
Subject: Re: Creating Proc from String?

Austin Ziegler wrote:
> I'm looking at extending a program that I've written to allow 
> arbitrary Ruby to be executed from within it. Basically, the 
> arbitrary Ruby will be executed ONLY in the context of something 
> like:
> 
> a = IO.readlines(current_file)
> a.each custom_block
> 
> custom_block will be built from a string:
> 
> { |line|
>    <lines from configuration file>
> }
> 
> How would I do this? If I can get this figured out, then I'll worry 
> about how I get it working under exerb later (:

Something like this maybe?

irb(main):002:0> s = "x + 1"
"x + 1"
irb(main):003:0> pr = eval "proc {|x| #{s} }"
#<Proc:0x401f1758@(eval):1>
irb(main):004:0> pr[3]
4