[ruby-core:61830] Re: [ruby-trunk - Feature #9696] [Open] More Flexible Refinement Syntax

For a practical solution you might be interested on you might build a
preprocessor that would generate the duplicate files you need which could
be ignored by your VCS but included in your gem.
Em 03/04/2014 00:22, <[e-mail]> escreveu:

> Issue #9696 has been reported by Thomas Sawyer.
>
> ----------------------------------------
> Feature #9696: More Flexible Refinement Syntax
> https://bugs.ruby-lang.org/issues/9696
>
> * Author: Thomas Sawyer
> * Status: Open
> * Priority: Normal
> * Assignee:
> * Category: core
> * Target version: current: 2.2.0
> ----------------------------------------
> I am the maintainer of Ruby Facets, the core extensions library. For the
> next release of Facets I have long planned to provide support for
> Refinements. Unfortunately, after working with the code to determine what
> would be necessary to support them, I've come to the conclusion that it's
> just not reasonable to do so. The problem lies in the fact that Facets must
> still be backward compatible with it's "monkey-patch" usage. In fact, that
> usage is sometimes preferable b/c you can require once and don't have to
> write `using Foo` in every file that a core extension might be needed. But,
> b/c of the syntax that refinements use, to support both patching and
> refining I would have to maintain TWO COPIES of every extension, which
> simply isn't practical.
>
> For example, the normal definition of a String#foo:
>
> ~~~
> class String
>   def foo
>     ...
>   end
> end
> ~~~
>
> And the refinement:
>
> ~~~
> module Facets
>   refine String do
>     def foo
>       ...
>     end
>   end
> end
> ~~~
>
> There does not appear to be any reasonable way to have the definition
> defined once and still be able to be use it in either manner. (Also, I want
> to point out that refinements do not lend themselves to cherry picking
> specific methods per-file either.)
>
> So, unless someone has a clever approach that I have not thought of, I
> wonder if it would not be a good idea to reconsider the syntax of
> refinements. Would it be possible to simplify the definition to use `class`
> instead of `refine`, e.g.
>
> ~~~
> module Facets
>   class String
>     def foo
>       ...
>     end
>   end
> end
> ~~~
>
> And then allow `using Facets` which would refine any common class is the
> scope. And further, allowing also `using Facets::String` and even `using
> Facets::String::foo` to cherry pick refinements? In addition, a way to
> "apply" a module as if it were evaluated in the scope. This would then
> allow the same code to be used either as a refinement or as an extension.
>
> Alternatively, maybe refinements should just be a require --if they will
> forever remain at the file-level. Then no special syntax would be needed at
> all. Simply defining them in a separate file, e.g.
>
> ~~~
> # string/foo.rb
> class String
>   def foo
>     ...
>   end
> end
> ~~~
>
> And then "using" them by file name instead would do the trick.
>
> ~~~
> using 'string/foo'
> ~~~
>
>
>
>
>
> --
> https://bugs.ruby-lang.org/
>