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module Morpher
class Evaluator
# Abstract namespace class for transforming evaluators
class Transformer < self
include AbstractType
# Error raised when transformation cannot continue
class TransformError < RuntimeError
include Concord.new(:transformer, :input)
end
# Test evaluator transformer is transitive
#
# A transitive evaluator allows to inverse an operation
# via its #inverse evaluator.
#
# @return [true]
# if transformer is transitive
#
# @return [false]
# otherwise
#
# @api private
#
abstract_method :transitive?
# Mixin for evaluators that are transitive by definition
module Transitive
# Test if evaluator is transitive
#
# @return [false]
#
# @api private
#
def transitive?
true
end
end # Intransitive
# Mixin for evaluators that are intransitive by definition
module Intransitive
# Test if evaluator is transitive
#
# @return [false]
#
# @api private
#
def transitive?
false
end
end # Intransitive
private
# Raise transform error
#
# @param [Object] input
#
# @raise [TransformError]
#
# @return [undefined]
#
# @api private
#
def raise_transform_error(input)
fail TransformError.new(self, input)
end
end # Transform
end # Evaluator
end # Morpher
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