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module Morpher
class Evaluator
class Predicate
# Evaluator for nary boolean predicates
class Boolean < self
include Nary
# Call evaluator with input
#
# @param [Object] input
#
# @return [Boolean]
#
# @api private
#
def call(input)
body .public_send(
self.class::ENUMERABLE_METHOD
) { |evaluator| evaluator.call(input) }
end
# Return evaluation for input
#
# @param [Object] input
#
# @return [Evaluation::Nary]
#
# @api private
#
def evaluation(input)
klass = self.class
evaluations = body.each_with_object([]) do |evaluator, aggregate|
evaluation = evaluator.evaluation(input)
aggregate << evaluation
next if evaluation.output.equal?(klass::OUTPUT_EXPECTATION)
return send(klass::ERROR_METHOD, input, aggregate)
end
send(klass::SUCCESS_METHOD, input, evaluations)
end
# Evaluator for nary and predicates
class And < self
register :and
ENUMERABLE_METHOD = :all?
OUTPUT_EXPECTATION = true
ERROR_METHOD = :evaluation_negative
SUCCESS_METHOD = :evaluation_positive
end # And
# Evaluator for nary or predicates
class Or < self
register :or
ENUMERABLE_METHOD = :any?
OUTPUT_EXPECTATION = false
ERROR_METHOD = :evaluation_positive
SUCCESS_METHOD = :evaluation_negative
end # Or
# Evaluator for nary xor predicates
class Xor < self
register :xor
ENUMERABLE_METHOD = :one?
OUTPUT_EXPECTATION = false
ERROR_METHOD = :evaluation_positive
SUCCESS_METHOD = :evaluation_negative
end # Xor
end # Boolean
end # Predicate
end # Evaluator
end # Morpher
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