Torsten Rüger
6993e337bf
after some serious recursive thinking it now actually makes sense The key was to change the actual type of the class that the meta_class manages For objects it's (still) ok just to change the instance_type, but since the class object exists and has type, when adding instance variables, that actual type has to change
77 lines
2.4 KiB
Ruby
77 lines
2.4 KiB
Ruby
module Parfait
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# Behaviour is the old smalltalk name for the duperclass of class and meta_class
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#
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# Classes and meta_classes are in fact very similar, in that they manage
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# - the type of instances
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# - the methods for instances
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#
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# The main way they differ is that Classes manage type for a class of objects (ie many)
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# whereas meta_class, or singleton_class manages the type of only one object (here a class)
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#
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# Singleton classes can manage the type/methods of any single object, and in the
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# future off course they will, just not yet. Most single objects don't need that,
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# only Classes and Modules _always _ do, so that's where we start.
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#
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class Behaviour < Object
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attr_reader :instance_type , :instance_methods
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def initialize(type)
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super()
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@instance_methods = List.new
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@instance_type = type
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end
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def methods
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@instance_methods
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end
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def method_names
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names = List.new
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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_for(name , type , frame , body )
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method = Parfait::VoolMethod.new(name , type , frame , body )
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add_instance_method( method )
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end
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def add_instance_method( method )
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raise "not implemented #{method.class} #{method.inspect}" unless method.is_a? VoolMethod
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@instance_methods.push(method)
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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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found ? methods.delete(found) : false
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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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@instance_methods.find {|m| m.name == fname }
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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( super_class_name && super_class_name != :Object )
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method = @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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# adding an instance changes the instance_type to include that variable
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def add_instance_variable( name , type)
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@instance_type = @instance_type.add_instance_variable( name , type )
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end
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end
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end
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