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module Morpher
class Evaluator
# Mixin to define nullary evaluators
module Nullary
CONCORD = Concord::Public.new
PRINTER = lambda do |_|
name
end
# Instance methods for nullary evaluators
module InstanceMethods
# Return default successful evaluation
#
# @param [Object] input
#
# @return [Evaluation]
#
# @api private
#
def evaluation(input)
evaluation_success(input, call(input))
end
# Return node
#
# @return [AST::Node]
#
# @api private
#
def node
s(type)
end
private
# Return evaluation error for input
#
# @param [Object] input
#
# @return [Evaluation]
#
# @api private
#
def evaluation_error(input)
Evaluation::Nullary.new(
evaluator: self,
input: input,
output: Undefined,
success: false
)
end
# Return evaluation success for input and output
#
# @param [Object] input
# @param [Object] output
#
# @return [Evaluation]
#
# @api private
#
def evaluation_success(input, output)
Evaluation::Nullary.new(
evaluator: self,
input: input,
output: output,
success: true
)
end
end # InstanceMethods
# Hook called when module gets included
#
# @return [undefined]
#
# @api private
#
def self.included(descendant)
descendant.class_eval do
include InstanceMethods, CONCORD
printer(&PRINTER)
end
end
private_class_method :included
end # Nullary
end # Evaluator
end # Morpher
|
