Sha256: 2bc103a680788697f8280f3eb9e4ae63a4e932dde56fb139fb5a189a54cd0121
Contents?: true
Size: 1.9 KB
Versions: 6
Compression:
Stored size: 1.9 KB
Contents
# Ripped from 1.8 stdlib
module Mirah
module Util
class Delegator
IgnoreBacktracePat = %r"\A#{Regexp.quote(__FILE__)}:\d+:in `"
end
def self.DelegateClass(superclass)
klass = Class.new
methods = superclass.public_instance_methods(true).map(&:to_s)
methods -= ::Kernel.public_instance_methods(false).map(&:to_s)
methods -= ["__id__", "__send__"] if RUBY_VERSION > '1.9' # avoid warnings
methods |= ["to_s","to_a","inspect","==","=~","==="]
klass.module_eval {
def initialize(obj) # :nodoc:
@_dc_obj = obj
end
def method_missing(m, *args) # :nodoc:
unless @_dc_obj.respond_to?(m)
super(m, *args)
end
@_dc_obj.__send__(m, *args)
end
def respond_to?(m, include_private = false) # :nodoc:
return true if super
return @_dc_obj.respond_to?(m, include_private)
end
def __getobj__ # :nodoc:
@_dc_obj
end
def __setobj__(obj) # :nodoc:
raise ArgumentError, "cannot delegate to self" if self.equal?(obj)
@_dc_obj = obj
end
def clone # :nodoc:
new = super
new.__setobj__(__getobj__.clone)
new
end
def dup # :nodoc:
new = super
new.__setobj__(__getobj__.clone)
new
end
}
for method in methods
begin
klass.module_eval <<-EOS, __FILE__, __LINE__+1
def #{method}(*args, &block)
begin
@_dc_obj.__send__(:#{method}, *args, &block)
ensure
$@.delete_if{|s| ::Mirah::Util::Delegator::IgnoreBacktracePat =~ s} if $@
end
end
EOS
rescue SyntaxError
raise NameError, "invalid identifier %s" % method, caller(3)
end
end
return klass
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems