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module Morpher
class Evaluator
class Predicate
# Predicate negation
class Negation < self
include Unary
register :negate
# Return evaluation for input
#
# @param [Object] input
#
# @return [Evaluation]
#
# @api private
#
def evaluation(input)
operand_output = operand.call(input)
evaluation_success(input, operand_output, !operand_output)
end
# Call evaluator
#
# @param [Object] input
#
# @return [true]
# if input NOT evaluated to true under operand
#
# @return [false]
# otherwise
#
# @api private
#
def call(input)
!operand.call(input)
end
# Return inverse evaluator
#
# @return [Evaluator]
#
# @api private
#
def inverse
operand
end
end # Negation
end # Predicate
end # Evaluator
end # Morpher
|
