From: Rick DeNatale <rick.denatale@...>
Date: 2008-03-12T11:26:35+09:00
Subject: Re: setting local variables via eval

On 3/11/08, Joel VanderWerf <vjoel@path.berkeley.edu> wrote:
> Rick DeNatale wrote:
>  > On 3/11/08, ara howard <ara.t.howard@gmail.com> wrote:
>  >>  thought some here might appreciate this
>  >>
>  >>    http://drawohara.com/post/28514698
>  >>
>  >>  kind regards
>  >>
>  >>  a @ http://codeforpeople.com/
>  >
>  > No need for Object#context
>  >
>  >   class View
>  >     def initialize template
>  >       @template = template
>  >     end
>  >
>  >     def render locals = {}
>  >       context = binding
>  >       locals.each do |k, v|
>  >         var = k
>  >         value = "ObjectSpace._id2ref #{ v.object_id }"
>  >         definition = "#{ var } = #{ value }"
>  >         eval definition, context
>  >       end
>  >       double_quoted_heredoc = ['<<__template__', @template,
>  > '__template__'].join("\n")
>  >       eval double_quoted_heredoc, context
>  >     end
>  >   end
>  >
>  >   view = View.new '<body> #{ x + y } </body>'
>  >
>  >   puts view.render(:x => 40, :y => 2)  #=> <body> 42 </body>
>  >
>  > Works just as well.
>
>
> Not quite.
>
>    view = View.new '<body> #{ x + y } #{locals} </body>'
>    puts view.render(:x => 40, :y => 2)  # ==> <body> 42 x40y2 </body>

Not on my machine:

RubyMate r8136 running Ruby r1.8.6
(/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby)
>>> untitled

<body> 42 </body>
Program exited.
-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/