80 lines
2.2 KiB
Ruby
80 lines
2.2 KiB
Ruby
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# described in the ruby language book as the eigenclass, what you get with
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# class MyClass
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# class << self <--- this is called the eigenclass, or metaclass, and really is just
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# .... the class object but gives us the ability to use the
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# syntax as if it were a class
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#
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module Parfait
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module Behaviour
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def self.included(base)
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base.attribute :instance_methods
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end
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def initialize
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super()
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self.instance_methods = List.new
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end
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def methods
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m = self.instance_methods
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return m if m
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self.instance_methods = List.new
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end
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def method_names
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names = List.new
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self.methods.each do |method|
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names.push method.name
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end
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names
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end
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def add_instance_method method
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raise "not a method #{method.class} #{method.inspect}" unless method.is_a? Method
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raise "syserr #{method.name.class}" unless method.name.is_a? Symbol
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if self.is_a?(Class) and (method.for_class != self)
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raise "Adding to wrong class, should be #{method.for_class}"
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end
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found = get_instance_method( method.name )
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if found
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self.methods.delete(found)
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end
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self.methods.push method
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#puts "#{self.name} add #{method.name}"
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method
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end
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def remove_instance_method method_name
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found = get_instance_method( method_name )
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if found
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self.methods.delete(found)
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else
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raise "No such method #{method_name} in #{self.name}"
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end
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return true
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end
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def get_instance_method fname
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raise "get_instance_method #{fname}.#{fname.class}" unless fname.is_a?(Symbol)
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#if we had a hash this would be easier. Detect or find would help too
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self.methods.each do |m|
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return m if(m.name == fname )
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end
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nil
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end
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# get the method and if not found, try superclasses. raise error if not found
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def resolve_method m_name
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raise "resolve_method #{m_name}.#{m_name.class}" unless m_name.is_a?(Symbol)
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method = get_instance_method(m_name)
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return method if method
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if( self.super_class_name )
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method = self.super_class.resolve_method(m_name)
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end
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method
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end
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end
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end
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