Module: JInterface::InterfaceClassMethods

Defined in:
lib/jinterface/interface_class_methods.rb

Instance Method Summary collapse

Instance Method Details

#extend(*args) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 86

def extend(*args)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot extend,"\
		" only include other interfaces."
	)
end

#extended(obj) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 92

def extended(obj)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot be "\
		" extended, only included, in '#{obj.name}'."
	)
end

#include(*args) ⇒ Object 



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# File 'lib/jinterface/interface_class_methods.rb', line 5

def include(*args)
	#For each inclusion
	args.each do |mod|
		#Make sure it is an interface
		raise TypeError.new(
			"Cannot include non-interface module"\
			" '#{mod.name}' in interface '#{self.name}'."
		) unless JInterface.interface? mod
		#Add the method arrays together
		arg_ranges = mod.instance_variable_get(:@arg_ranges)
		arg_ranges.each do |method_name, range|
			@arg_ranges[method_name] = range + @arg_ranges[method_name]
		end
		#Include it
		super mod
	end
end

#included(obj) ⇒ Object 



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# File 'lib/jinterface/interface_class_methods.rb', line 22

def included(obj)
	#Ignore if included in an interface,
	#include method will take care of checks
	return if JInterface.interface?(obj)
	#Cache public obj method names
	obj_methods = Hash[obj.public_instance_methods.map.with_index.to_a]
	#Check interface methods are implemented in obj
	act_range = JInterface::ArgRange.new(nil)
	self.public_instance_methods.each do |method_name|
		#If method does not exist
		if not obj_methods.key? method_name
			#Raise error if under a different scope
			[:private, :protected].each do |scope|
				raise NameError.new(
					"Method '#{method_name}' in class '#{obj.name}'"\
					" must be declared as public, not #{scope},"\
					" as declared in interface '#{self.name}'."
				) if obj.send("#{scope}_method_defined?", method_name)
			end
			#If here, method does not exist. This is possible
			#if the method was removed or made undefined
			raise NotImplementedError.new(
				"Method '#{method_name}' must be implemented in class"\
				" '#{obj.name}' as declared in interface '#{self.name}'."
			)
		end
		#Make sure method was overriden (implemented)
		meth = obj.public_instance_method method_name
		raise NotImplementedError.new(
			"Method '#{method_name}' must be implemented in class"\
			" '#{obj.name}' as declared in interface '#{meth.owner.name}'."
		) if JInterface.interface? meth.owner
		#Make sure method can handle number of args defined
		act_range.reset(meth)
		exp_range = @arg_ranges[method_name]
		raise ArgumentError.new(
			"Method '#{method_name}' in class '#{obj.name}'"\
			" must handle #{exp_range} arguments, not #{act_range},"\
			" as declared in included interface(s)."
		) unless act_range.cover? exp_range
	end
end

#method_added(method_name) ⇒ Object 



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# File 'lib/jinterface/interface_class_methods.rb', line 64

def method_added(method_name)
	meth = self.public_instance_method(method_name)
	@arg_ranges[method_name] = JInterface::ArgRange.new(meth) + @arg_ranges[method_name]
end

#prepend(*args) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 98

def prepend(*args)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot prepend,"\
		" only include other interfaces."
	)
end

#prepended(obj) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 104

def prepended(obj)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot be "\
		" prepended, only included, in '#{obj.name}'."
	)
end

#private(*args) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 68

def private(*args)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot declare"\
		" private methods, only public methods."
	)
end

#protected(*args) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 74

def protected(*args)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot declare"\
		" protected methods, only public methods."
	)
end

#singleton_method_added(*args) ⇒ Object

Raises:

  • (SyntaxError) 


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# File 'lib/jinterface/interface_class_methods.rb', line 80

def singleton_method_added(*args)
	raise SyntaxError.new(
		"Interface '#{self.name}' cannot declare"\
		" class methods, only instance methods."
	)
end