Forum: Ruby-core [CommonRuby - Feature #7747][Open] Expanded API for Binding semantics

Issue #7747 has been reported by jballanc (Joshua Ballanco).

----------------------------------------
Feature #7747: Expanded API for Binding semantics
https://bugs.ruby-lang.org/issues/7747

Author: jballanc (Joshua Ballanco)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:


=begin
Currently, the only way to create a new instance of Binding is to get a 
copy of the current scope's binding, or ask some other object for its 
binding. In either case, the binding object returned always has 
semantics identical to the original binding. In other words, a binding 
object used with eval is capable of (not necessarily an exhaustive 
list):

* redefining methods on the binding target
* defining new methods on the binding target
* getting/setting instance variables
* getting/creating new constants

This feature proposal would introduce a new mechanism for creating a 
binding and adjusting its relationship with the source binding. For 
example, if you have a class (({Foo})) defined like so:

    class Foo
      def say
        puts "hello!"
      end
    end

Then you would be able to create a new binding that ((*won't*)) 
propagate new definitions to the parent binding like so:

    new_binding = Binding.new(Foo)
    new_binding.propagate = false
    new_binding.eval("def shout; puts 'HI!'; end")

    Foo.new.say #=> "hello!"
    Foo.new.shout #=> No Method Error
    new_binding.eval("Foo.new.say") #=> "hello"
    new_binding.eval("Foo.new.shout") #=> "HI!"

If, additionally, we introduce a way to merge or combine bindings, then 
this API could actually be used to implement refinements in pure Ruby 
like so (note I am also assuming that (({Binding#eval})) gains the 
ability to take a block):

    class Module
      def refine(klass, &block)
        @refined_bindings ||= {}
        refinement_binding = Binding.new(klass)
        refinement_binding.propagate = false
        refinement_binding.shadow = true
        refinement_binding.eval &block
        (@refined_bindings[self.name] ||= []) << refinement_binding
      end

      def using(mod)
        @refined_bindings[mod].each { |refinement| 
self.binding.merge(refinement) }
      end
    end

Following is the preliminary list of additional APIs I am tentatively 
proposing (though I expect this to change with additional discussion):

* (({Binding.new(an_object)})) - creates a new Binding object that 
"inherits" the binding of the argument; essentially equivalent to 
(({an_object.send(:binding).dup}))
* (({Binding#propagate}))/(({Binding#propagate=})) - boolean; determines 
whether new method, class, or Constant defs are propagated into the 
"parent" binding's scope
* (({Binding#shadow}))/(({Binding#shadow=})) - boolean; sets whether or 
not new values for existing methods/constants/variables can be set
* (({Binding#freeze})) - causes the Binding to capture all existing 
methods/constants/variables in scope at call time, and "disconnect" from 
the parent binding, so that any updates to definitions or values are no 
longer reflected into the "child" binding
* (({Binding#merge(other_binding)})) - combines the 
method/constant/variable bindings in (({other_binding})) with the 
receiver; effectively shadows the "parent" of (({other_binding})) within 
the receiver binding
=end

Issue #7747 has been updated by jballanc (Joshua Ballanco).


=begin
It should also be possible to implement feature request #6710 with this 
API. The "isolated" binding mentioned in that request could be 
implemented as:

    def isolated_eval(src)
      isolated = Binding.new #=> No source binding creates an empty 
environment
      isolated.eval(src)
      TOPLEVEL_BINDING.merge(isolated)
    end

=end

----------------------------------------
Feature #7747: Expanded API for Binding semantics
https://bugs.ruby-lang.org/issues/7747#change-35679

Author: jballanc (Joshua Ballanco)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:


=begin
Currently, the only way to create a new instance of Binding is to get a 
copy of the current scope's binding, or ask some other object for its 
binding. In either case, the binding object returned always has 
semantics identical to the original binding. In other words, a binding 
object used with eval is capable of (not necessarily an exhaustive 
list):

* redefining methods on the binding target
* defining new methods on the binding target
* getting/setting instance variables
* getting/creating new constants

This feature proposal would introduce a new mechanism for creating a 
binding and adjusting its relationship with the source binding. For 
example, if you have a class (({Foo})) defined like so:

    class Foo
      def say
        puts "hello!"
      end
    end

Then you would be able to create a new binding that ((*won't*)) 
propagate new definitions to the parent binding like so:

    new_binding = Binding.new(Foo)
    new_binding.propagate = false
    new_binding.eval("def shout; puts 'HI!'; end")

    Foo.new.say #=> "hello!"
    Foo.new.shout #=> No Method Error
    new_binding.eval("Foo.new.say") #=> "hello"
    new_binding.eval("Foo.new.shout") #=> "HI!"

If, additionally, we introduce a way to merge or combine bindings, then 
this API could actually be used to implement refinements in pure Ruby 
like so (note I am also assuming that (({Binding#eval})) gains the 
ability to take a block):

    class Module
      def refine(klass, &block)
        @refined_bindings ||= {}
        refinement_binding = Binding.new(klass)
        refinement_binding.propagate = false
        refinement_binding.shadow = true
        refinement_binding.eval &block
        (@refined_bindings[self.name] ||= []) << refinement_binding
      end

      def using(mod)
        @refined_bindings[mod].each { |refinement| 
self.binding.merge(refinement) }
      end
    end

Following is the preliminary list of additional APIs I am tentatively 
proposing (though I expect this to change with additional discussion):

* (({Binding.new(an_object)})) - creates a new Binding object that 
"inherits" the binding of the argument; essentially equivalent to 
(({an_object.send(:binding).dup}))
* (({Binding#propagate}))/(({Binding#propagate=})) - boolean; determines 
whether new method, class, or Constant defs are propagated into the 
"parent" binding's scope
* (({Binding#shadow}))/(({Binding#shadow=})) - boolean; sets whether or 
not new values for existing methods/constants/variables can be set
* (({Binding#freeze})) - causes the Binding to capture all existing 
methods/constants/variables in scope at call time, and "disconnect" from 
the parent binding, so that any updates to definitions or values are no 
longer reflected into the "child" binding
* (({Binding#merge(other_binding)})) - combines the 
method/constant/variable bindings in (({other_binding})) with the 
receiver; effectively shadows the "parent" of (({other_binding})) within 
the receiver binding
=end

Issue #7747 has been updated by pasvan (paster okan).


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erkek partnerinin düzenli cinsel hayatının olmasını, orgazmı tatmasını, 
mutlu bir kadın cinselliği yaşamasını ister. Cinselilişkinin kaliteli 
olması bir kadının isteksizliğini olumlu yönde etkileyebilir. 
Kalitesizlik sadece erkeklik organı büyüklüğü veya geciktirme spreyleri 
kullanılmadığı için erken boşalmanın yaşanması ile ilgili değildir. 
Kadın cinsel ilişkide orgazm olmalı, erkek ise ereksiyon yaşamalıdır. 
Kadına istek arttırıcı bayan damla yani afrodizyak parfüm almak yerine 
<a href="http://www.vpillssatis.gen.tr/kullanimi.html" title="v-pills 
kullanmanız">v-pills kullanmanız</a> daha iyi olucaktır. İnsan için 
beyin ve zeka konusunda yararlı vitamin olan <a 
href="http://www.nzt48turkiye.gen.tr/index.html" title="nzt 48">nzt 
48</a> panik atak konusundada etkilidir. Nzt
  48 vitamini içerisinde en çok bulunan vitamin ise B vitaminidir. 
Kibarlı panax'ın sahibi mustafa eraslanın üretmiş olduğu ve içinde 
ginseng maddeside bulunan <a href="http://www.panaxtr.com/" 
title="panax">panax</a> %100 doğal ve % 100 bitkisel bir üründür. Panax 
siparişi vermek isterseniz sitemize tıklamanız yeterlidir.

----------------------------------------
Feature #7747: Expanded API for Binding semantics
https://bugs.ruby-lang.org/issues/7747#change-37369

Author: jballanc (Joshua Ballanco)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:


=begin
Currently, the only way to create a new instance of Binding is to get a 
copy of the current scope's binding, or ask some other object for its 
binding. In either case, the binding object returned always has 
semantics identical to the original binding. In other words, a binding 
object used with eval is capable of (not necessarily an exhaustive 
list):

* redefining methods on the binding target
* defining new methods on the binding target
* getting/setting instance variables
* getting/creating new constants

This feature proposal would introduce a new mechanism for creating a 
binding and adjusting its relationship with the source binding. For 
example, if you have a class (({Foo})) defined like so:

    class Foo
      def say
        puts "hello!"
      end
    end

Then you would be able to create a new binding that ((*won't*)) 
propagate new definitions to the parent binding like so:

    new_binding = Binding.new(Foo)
    new_binding.propagate = false
    new_binding.eval("def shout; puts 'HI!'; end")

    Foo.new.say #=> "hello!"
    Foo.new.shout #=> No Method Error
    new_binding.eval("Foo.new.say") #=> "hello"
    new_binding.eval("Foo.new.shout") #=> "HI!"

If, additionally, we introduce a way to merge or combine bindings, then 
this API could actually be used to implement refinements in pure Ruby 
like so (note I am also assuming that (({Binding#eval})) gains the 
ability to take a block):

    class Module
      def refine(klass, &block)
        @refined_bindings ||= {}
        refinement_binding = Binding.new(klass)
        refinement_binding.propagate = false
        refinement_binding.shadow = true
        refinement_binding.eval &block
        (@refined_bindings[self.name] ||= []) << refinement_binding
      end

      def using(mod)
        @refined_bindings[mod].each { |refinement| 
self.binding.merge(refinement) }
      end
    end

Following is the preliminary list of additional APIs I am tentatively 
proposing (though I expect this to change with additional discussion):

* (({Binding.new(an_object)})) - creates a new Binding object that 
"inherits" the binding of the argument; essentially equivalent to 
(({an_object.send(:binding).dup}))
* (({Binding#propagate}))/(({Binding#propagate=})) - boolean; determines 
whether new method, class, or Constant defs are propagated into the 
"parent" binding's scope
* (({Binding#shadow}))/(({Binding#shadow=})) - boolean; sets whether or 
not new values for existing methods/constants/variables can be set
* (({Binding#freeze})) - causes the Binding to capture all existing 
methods/constants/variables in scope at call time, and "disconnect" from 
the parent binding, so that any updates to definitions or values are no 
longer reflected into the "child" binding
* (({Binding#merge(other_binding)})) - combines the 
method/constant/variable bindings in (({other_binding})) with the 
receiver; effectively shadows the "parent" of (({other_binding})) within 
the receiver binding
=end