From: Robert Klemme <bob.news@...>
Date: 2005-03-16T19:49:48+09:00
Subject: Re: eval/binding question


"Stefan Kaes" <skaes@gmx.net> schrieb im Newsbeitrag
news:4238013C.8040806@gmx.net...
> Robert Klemme wrote:
>
> >Hm, I'm not 100% sure I modeled this properly, but does this solve the
> >problem?
> >
> >
> No. _code gets parsed on every call to local_eval.

If you want to avoid that you'll need a two step approach.  But then the
var names are needed beforehand...  Ok, I see the problem (finally) :-)

Cheers

    robert

>
> >I omitted the template name and the value as these are just special
cases
> >of values with fixed names.  But you get the picture.  And there is no
> >reparsing needed.
> >
> >def local_eval(_values, _code)
> >  _val = nil
> >  _bnd = binding
> >  p local_variables
> >  _values.each {|name, val| eval "#{name}=_val", _bnd}
> >  p local_variables
> >  eval _code, _bnd
> >end
> >
> >
> >
> >>>local_eval( {:x=>1}, "puts x" )
> >>>
> >>>
> >["_values", "_code", "_val", "_bnd"]
> >["_values", "_code", "_val", "_bnd", "x"]
> >nil
> >=> nil
> >
> >
> -- stefan
>