From: Jamis Buck <jamis_buck@...>
Date: 2005-03-03T09:02:34+09:00
Subject: Re: Erb: terminating a script?

On Mar 2, 2005, at 4:02 PM, Lloyd Zusman wrote:

>> Have you tried doing 'return'? Or perhaps 'break'? I haven't tried 
>> these
>> myself, so I don't know if they will work or not. Just throwing out 
>> some
>> ideas.
>

[snip]

>   Original line in ErbHandler#do_GET ...
>
>     res.body = evaluate(ERB.new(data), req, res)
>
>   Replaced with ...
>
>     res.body = evaluate(ERB.new('<% catch(:quit) { %>' +
>                                 data +
>                                 '<% } %>'), req, res)
>
> Then, I can exit by doing a '<% throw :quit %>' from anywhere in the
> page.  And any text that's specified before the 'throw' appears in the
> resulting text.
>
> The following also yields the same results:
>
>     res.body = evaluate(ERB.new('<% lambda { %>' + data + '<% }.call 
> %>')
>                         req, res)
>
> In this case, I can exit early by using either '<% break %>' or
> '<% return %>'.  I like this one better, and this is what I have
> just now implemented in my application.

Excellent work, Lloyd. Thanks for sharing!

> Because of this, it seems to me that it would be beneficial if Erb were
> to always put a lambda-call block around the text that gets evaluated.
>
> I'm in favor of this enhancement going into a subsequent release, and
> I'll soon submit a patch.
>
> Thoughts or opinions?

I'd vote for it. :)

- Jamis