From: Joel VanderWerf <vjoel@...>
Date: 2008-03-12T11:57:09+09:00
Subject: Re: setting local variables via eval

Rick DeNatale wrote:
> 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>

Hm. Unless there are at least 2 spaces after the Answer (to the Ultimate 
Question et al), you're not running my two lines of code there... (Even 
if locals was nil, you'd still get two spaces.)

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407