7293386c26
* rubocop still warns about this on ruby 1.9.3, so it was fixed so it produces less output on travis.
93 lines
2.2 KiB
Ruby
93 lines
2.2 KiB
Ruby
# encoding: utf-8
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module Mutant
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class Mutator
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# Registry for mutators
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module Registry
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# Raised when the type is an invalid type
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InvalidTypeError = Class.new(TypeError)
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# Raised when the type is a duplicate
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DuplicateTypeError = Class.new(ArgumentError)
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# Register mutator class for AST node class
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#
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# @param [Symbol] type
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# @param [Class] mutator_class
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#
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# @api private
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#
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# @return [self]
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#
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def self.register(type, mutator_class)
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assert_valid_type(type)
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assert_unique_type(type)
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registry[type] = mutator_class
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self
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end
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# Lookup mutator class for node
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#
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# @param [Parser::AST::Node] node
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#
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# @return [Class]
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#
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# @raise [ArgumentError]
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# raises argument error when mutator class cannot be found
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#
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# @api private
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#
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def self.lookup(node)
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type = node.type
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registry.fetch(type) do
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raise ArgumentError, "No mutator to handle: #{type.inspect}"
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end
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end
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# Return registry state
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#
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# @return [Hash]
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#
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# @api private
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#
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def self.registry
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@registry ||= {}
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end
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private_class_method :registry
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# Assert the node type is valid
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#
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# @return [undefined]
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#
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# @raise [InvalidTypeError]
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# raised when the node type is invalid
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#
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# @api private
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#
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def self.assert_valid_type(type)
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unless NODE_TYPES.include?(type) || type.kind_of?(Class)
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raise InvalidTypeError, "invalid type registration: #{type}"
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end
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end
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private_class_method :assert_valid_type
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# Assert the node type is unique and not already registered
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#
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# @return [undefined]
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#
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# @raise [DuplcateTypeError]
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# raised when the node type is a duplicate
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#
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# @api private
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#
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def self.assert_unique_type(type)
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if registry.key?(type)
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raise DuplicateTypeError, "duplicate type registration: #{type}"
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end
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end
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private_class_method :assert_unique_type
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end # Registry
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end # Mutator
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end # Mutant
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