From: Stefan Kaes <skaes@...>
Date: 2005-03-16T14:15:30+09:00
Subject: Re: eval/binding question

Eric Hodel wrote:

> On 15 Mar 2005, at 08:17, Stefan Kaes wrote:
>
>> when using ERB one can compile a template into source, which can then 
>> be eval'ed using eval. Local variables for use in the template can be 
>> set up using the sort of eval given in my example. However, in this 
>> case the 'compiled' template code gets reparsed on each evaluation of 
>> the template code. I wanted to speed up this process by defining a 
>> function (eval "def fun; #{src}; end", aBinding), thereby pasring the 
>> code only once.
>
>
> ERb already does this for you.  See ERB::Defmethod.  Unfortunately, 
> there are no docs for it, but you can dig around in Rails to see how 
> it is used.
>
That's not true. ERB::Defmethod does not work this way. And Rails uses 
the less efficient method, which I wanted to improve on (and did). And I 
wanted the local varaiable solution mainly for backwards compatibility 
with rendering partials in Rails. But the question about eval/binding 
semantics was posted to this list because I thought (and still think) 
that the semantics of eval is not what it should be.