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Versions: 12
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Contents
module DataMapper
module Equalizer
def equalize(*methods)
define_eql_method(methods)
define_equivalent_method(methods)
define_hash_method(methods)
end
private
def define_eql_method(methods)
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def eql?(other)
return true if equal?(other)
instance_of?(other.class) &&
#{methods.map { |method| "#{method}.eql?(other.#{method})" }.join(' && ')}
end
RUBY
end
def define_equivalent_method(methods)
respond_to = []
equivalent = []
methods.each do |method|
respond_to << "other.respond_to?(#{method.inspect})"
equivalent << "#{method} == other.#{method}"
end
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def ==(other)
return true if equal?(other)
return false unless kind_of?(other.class) || other.kind_of?(self.class)
#{respond_to.join(' && ')} &&
#{equivalent.join(' && ')}
end
RUBY
end
def define_hash_method(methods)
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def hash
self.class.hash ^ #{methods.map { |method| "#{method}.hash" }.join(' ^ ')}
end
RUBY
end
end
end
Version data entries
12 entries across 12 versions & 4 rubygems