rubyx/lib/parfait/behaviour.rb
Torsten Rüger 48e18ac9cd the superclass of a singleton class is the singleton class of the superclass
And i have tests to prove it!
That just rolls of the tongue, it had to be the commit message
2019-10-01 20:55:05 +03:00

95 lines
3.1 KiB
Ruby

module Parfait
# Behaviour is the old smalltalk name for the superclass of class and singleton_class
#
# Classes and singleton_classes are in fact very similar, in that they manage
# - the type of instances
# - the methods for instances
#
# - the instance methods are source level methods defined on the class
# - the type refers to the instance variables and callable methods of objects
# (in other words the type is a concrete representation, while instance_methods
# is more abstract, ie source level)
#
# The main way they differ is that Classes manage type for a class of objects (ie many)
# whereas singleton_class, or singleton_class manages the type of only one object
# (here a class)
#
# Singleton classes can manage the type/methods of any single object, and in the
# future off course they will, just not yet. Most single objects don't need that,
# only Classes and Modules _always _ do, so that's where we start.
#
class Behaviour < Object
attr_reader :instance_type , :instance_methods
def initialize(type)
super()
@instance_methods = List.new
@instance_type = type
end
def methods
@instance_methods
end
def method_names
names = List.new
@instance_methods.each do |method|
names.push method.name
end
names
end
def create_instance_method_for(name , type , frame , body )
raise "Method exists #{name}" if get_instance_method(name)
method = Parfait::VoolMethod.new(name , type , frame , body )
add_instance_method( method )
end
def add_instance_method( method )
raise "Method exists #{method.name}" if get_instance_method(method.name)
@instance_methods.push(method)
method
end
def remove_instance_method( method_name )
found = get_instance_method( method_name )
found ? methods.delete(found) : false
end
def get_instance_method( fname )
raise "get_instance_method #{fname}.#{fname.class}" unless fname.is_a?(Symbol)
@instance_methods.find {|m| m.name == fname }
end
# get the method and if not found, try superclasses. raise error if not found
def resolve_method( m_name )
raise "resolve_method #{m_name}.#{m_name.class}" unless m_name.is_a?(Symbol)
method = get_instance_method(m_name)
return method if method
if( s_class = super_class )
method = s_class.resolve_method(m_name)
end
method
end
# assume resolving is needed, ie getting has failed, raise if it hasnt
def resolve_method!( m_name )
method = get_instance_method(m_name)
if method
tm = @instance_type.method_names
raise "resolve_method #{name}.#{m_name} has #{tm}:#{method_names}"
end
#puts "resolve #{m_name}:#{super_class}:"
return nil unless( s_class = super_class )
s_class.resolve_method(m_name)
end
# adding an instance changes the instance_type to include that variable
def add_instance_variable( name , type)
@instance_type = @instance_type.add_instance_variable( name , type )
end
end
end