From: Logan Capaldo <logancapaldo@...>
Date: 2007-09-27T08:24:04+09:00
Subject: Re: Aliasing return false

On 9/26/07, Ari Brown <ari@aribrown.com> wrote:
> Hey all,
>
> I'm writing a quick DSL, and in it, I end up having to use return
> false unless {} quite a bunch.
>
> Since I still need everything outside of the return false's, Stefan
> <apeiros>'s Stepper code is of no use, although it is still quite
> awesome.
>
> Is there a way to alias it from, say:
>
> return false unless { klass.method? }
>
> to:
>
> rule { klass.method? }
>

this is evil

% cat rule.rb
def rule(&b)
  r = b.call
  eval("return false", b) unless r
end

def a
  rule { false }
  0
end

def b
  rule { true }
  1
end

p a
p b

% ruby rule.rb
false
1