From: "Andrew S. Townley" <ast@...>
Date: 2009-03-26T09:39:28+09:00
Subject: Re: [ANN] tagz-5.0.0

On Thu, 2009-03-26 at 09:30 +0900, ara.t.howard wrote:
> On Mar 25, 2009, at 2:17 PM, Andrew S. Townley wrote:
> 
> > Thanks.
> >
> > If you had to register the namespaces first in some kind of tagz
> > registry, maybe you could do something by handling the NameError when
> > you did:
> >
> > foo.bar_('bar:foo' => 42)
> >
> > If it had registered a namespace prefix of foo, then it'd just "do the
> > right thing", otherwise, you'd get the normal name error.  This would
> > probably be the most logical syntax, but it's way beyond my Ruby  
> > magical
> > abilities to figure out how to actually make it work.
> >
> > Still, I think it'd be the most readable of the proposed approaches...
> > I don't want to have to find unicode characters on my keyboard! :)
> >
> > Cheers,
> 
> how about this

I like it, but would change it a bit to allow you to initialize the
namespace URI.  Not sure what you'd do with a default namespace
declaration...

> 
> cfp:~ > cat a.rb
> require 'rubygems'
> require 'tagz'
> 
> class Namespace
>    def initialize(nsuri) &block
       @nsuri = nsuri
>      @ns = block.call.to_s
>      @context = block
>      @self = eval 'self', block
>    end
> 
>    instance_methods.each{|m| undef_method if m[%r/__/]}
> 
>    def method_missing m, *a, &b
>      if m.to_s[%r/^_|_$/]
>        @self.send("#{ @ns }:#{ m }", *a, &b)
>      else
>        "#{ @ns }:#{ m }"
>      end
>    end
> end
> 
> include Tagz.globally
> 
> a = Namespace.new(".."){ :a }
> b = Namespace.new(".."){ :b }
> 
> xml =
>    a.root_(emit_nsuri => true, include_children => true) {
>      a.foo_(b.bar => 'bar'){ 'content' }
>      b.bar_(a.foo => 'foo'){ 'content' }
>    }
> 
> puts xml
> 
> 
> 
> cfp:~ > ruby a.rb
> <a:root xmlns:a="..." xmlns:b="..."><a:foo b:bar="bar">content</a:foo><b:bar a:foo="foo">content</ 
> b:bar></a:root>
> 

What do you think?

-- 
Andrew S. Townley <ast@atownley.org>
http://atownley.org