зеркало из https://github.com/github/ruby.git
95 строки
2.1 KiB
Ruby
95 строки
2.1 KiB
Ruby
#
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# forwardable.rb -
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# $Release Version: 1.1$
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# $Revision$
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# $Date$
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# by Keiju ISHITSUKA(keiju@ishitsuka.com)
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# original definition by delegator.rb
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# --
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# Usage:
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#
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# class Foo
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# extend Forwardable
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#
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# def_delegators("@out", "printf", "print")
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# def_delegators(:@in, :gets)
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# def_delegator(:@contents, :[], "content_at")
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# end
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# f = Foo.new
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# f.printf ...
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# f.gets
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# f.content_at(1)
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#
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# g = Goo.new
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# g.extend SingleForwardable
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# g.def_delegator("@out", :puts)
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# g.puts ...
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#
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#
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module Forwardable
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@debug = nil
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class<<self
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attr_accessor :debug
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end
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def def_instance_delegators(accessor, *methods)
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for method in methods
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def_instance_delegator(accessor, method)
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end
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end
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def def_instance_delegator(accessor, method, ali = method)
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accessor = accessor.id2name if accessor.kind_of?(Integer)
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method = method.id2name if method.kind_of?(Integer)
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ali = ali.id2name if ali.kind_of?(Integer)
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module_eval(<<-EOS, "(__FORWARDABLE__)", 1)
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def #{ali}(*args, &block)
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begin
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#{accessor}.__send__(:#{method}, *args, &block)
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rescue Exception
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$@.delete_if{|s| /^\\(__FORWARDABLE__\\):/ =~ s} unless Forwardable::debug
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Kernel::raise
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end
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end
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EOS
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end
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alias def_delegators def_instance_delegators
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alias def_delegator def_instance_delegator
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end
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module SingleForwardable
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def def_singleton_delegators(accessor, *methods)
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for method in methods
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def_singleton_delegator(accessor, method)
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end
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end
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def def_singleton_delegator(accessor, method, ali = method)
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accessor = accessor.id2name if accessor.kind_of?(Integer)
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method = method.id2name if method.kind_of?(Integer)
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ali = ali.id2name if ali.kind_of?(Integer)
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instance_eval(<<-EOS, "(__FORWARDABLE__)", 1)
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def #{ali}(*args, &block)
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begin
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#{accessor}.__send__(:#{method}, *args,&block)
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rescue Exception
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$@.delete_if{|s| /^\\(__FORWARDABLE__\\):/ =~ s} unless Forwardable::debug
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Kernel::raise
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end
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end
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EOS
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end
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alias def_delegators def_singleton_delegators
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alias def_delegator def_singleton_delegator
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end
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