From: David Chelimsky <dchelimsky@...>
Date: 2006-09-03T05:17:24+09:00
Subject: Re: yielding a block to another block

Thank you! Can I credit you when I commit this?

On 9/2/06, Eero Saynatkari <eero.saynatkari@kolumbus.fi> wrote:
> Eero Saynatkari wrote:
> > David Chelimsky wrote:
> >> Hi all,
> >>
> >> The mocking framework in rspec uses method_missing to capture all the
> >> messages sent to it, comparing the message to a list of expected
> >> messages. For various reasons I'm trying to rework this so that
> >> instead of using method_missing, we define the expected message on the
> >> mock on the fly.
> >>
> >> For that to happen, setting expectations on the mock ends up invoking
> >> this:
> >>
> >>       def define_expected_method(sym)
> >>         (class << self; self; end).__send__(:define_method, sym,
> >> lambda {|*args| message_received(sym, *args)})
> >>       end
> >>
> >> The Proc yields *args, which are then passed to message_received. How
> >> can I get the Proc to yield a block that is passed in with the call to
> >> :sym? I tried this:
> >>
> >> lambda {|*args, &block| ....
> >>
> >> but it throws an error. Any other ideas? Let me know if the question
> >> is not clear.
> >
> > You cannot currently do that with a block (1.9 and 2.0 will
> > allow &block arguments). In the meanwhile, you can #eval the
> > method into existence instead:
> >
> >   def define_expected_method(sym)
> >     class << self; self; end.__send__ :class_eval, %{
> >       def #{sym}(*args, &block)
> >         message_received sym, *args, &block    # ?
> >       end
> >     }
> >   end
>
>   # One of these days.. *sigh*
>   def define_expected_method(sym)
>     class << self; self; end.__send__ :class_eval, %{
>       def #{sym}(*args, &block)
>         message_received :#{sym}, *args, &block    # ?
>       end
>     }
>   end
>
> >
> >> Thanks,
> >> David
>
> --
> Posted via http://www.ruby-forum.com/.
>
>