From: Yehuda Katz <wycats@...>
Date: 2009-02-19T15:22:59+09:00
Subject: [ruby-core:22246] YASNP (Yet Another Selector Namespace Proposal)

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The idea is to make selectors like optional versions of Python imports.
Example:
# merb/core_ext/string.rb

namespace Merb
  class String
    def to_s
      super + "Awesome"
    end
  end
end

# merb/application.rb

use Merb::String

class Foo
  def bar(str)
    str.to_s
  end
end

Some more examples are at: https://gist.github.com/83d390aea81a12f1667c

The basic implementation idea is that there be a new node named
call_with_namespace that would hold any namespaces registered for the file
in question. This would be a parse-time transform (based on a new use
keyword). You would also be able to cache the method lookup, based on the
selector AND the namespaces. So it shouldn't be a huge performance hit.

Thoughts?

-- 
Yehuda Katz
Developer | Engine Yard
(ph) 718.877.1325

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The idea is to make selectors like optional versions of Python imports. Exa=
mple:<div><br></div><div># merb/core_ext/string.rb</div><div><br></div><div=
>namespace Merb</div><div>&nbsp;&nbsp;class String</div><div>&nbsp;&nbsp; &=
nbsp;def to_s</div><div>
&nbsp;&nbsp; &nbsp; &nbsp;super + &quot;Awesome&quot;</div><div>&nbsp;&nbsp=
; &nbsp;end</div><div>&nbsp;&nbsp;end</div><div>end<br clear=3D"all"><br></=
div><div># merb/application.rb</div><div><br></div><div>use Merb::String</d=
iv><div><br></div><div>class Foo</div><div>
&nbsp;&nbsp;def bar(str)</div><div>&nbsp;&nbsp; &nbsp;str.to_s</div><div>&n=
bsp;&nbsp;end</div><div>end</div><div><br></div><div>Some more examples are=
 at:&nbsp;<a href=3D"https://gist.github.com/83d390aea81a12f1667c">https://=
gist.github.com/83d390aea81a12f1667c</a></div>
<div><br></div><div>The basic implementation idea is that there be a new no=
de named call_with_namespace that would hold any namespaces registered for =
the file in question. This would be a parse-time transform (based on a new =
use keyword). You would also be able to cache the method lookup, based on t=
he selector AND the namespaces. So it shouldn&#39;t be a huge performance h=
it.</div>
<div><br></div><div>Thoughts?</div><div><br>-- <br>Yehuda Katz<br>Developer=
 | Engine Yard<br>(ph) 718.877.1325<br>
</div>

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