From: Aaron Patterson <aaron@...>
Date: 2009-01-13T10:27:01+09:00
Subject: Re: Markaby -> Nokogiri Issue

On Tue, Jan 13, 2009 at 02:13:13AM +0900, Trans wrote:
> I was using:
> 
>     Markaby::Builder.new(&block)
> 
> And it was working fine except it wouldn't let me use non-standard
> attributes on an img tag, which blows. I couldn't find any way to
> deactivate this strictness, so I decided to try Nokogiri instead:
> 
>         Nokogiri::HTML::Builder.new(&block)
> 
> Unfortunately this doesn't work at all, b/c it turns out Nokogiri does
> not seem to be using #instance_eval on the block. Without doing so I
> don't see how it can be at all useful. For example in my case I have
> method called #body:
> 
>     def body(&block)
>         Nokogiri::HTML::Builder.new do
>           body(&block)
>         end
>     end

It does use instance_eval, but it also checks the context in which it
was instantiated to see if it responds to that method before creating a
new node.  That way your builder can have access to methods outside of
the builder.

> By not using instance_eval Nokogiri doesn't recognize 'body' as a tag,
> but tries to call the method again, resulting in an infinite loop. So
> I think this is a bug in Nokogiri's builder.

No.  This was a requested feature.  I gladly accept patches though!  :-)

> In the mean time, can anyone offer a work around? Or is there a way to
> turn off "strict-mode" for Markaby.

You should be able to do this:

  def body(&block)
    Nokogiri::HTML::Builder.new do
      insert(Nokogiri::XML::Node.new('body', @doc), &block)
    end
  end

Hope that helps!

-- 
Aaron Patterson
http://tenderlovemaking.com/