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module Morpher
class Compiler
# Compiler with evaluators as output
class Evaluator < self
include Concord.new(:evaluators, :emitters)
# Return evaluator tree for node
#
# @param [Node] node
#
# @return [Evalautor]
# on success
#
# @raise [Compiler::Error]
# on error
#
# @api private
#
def call(node)
evaluator = evaluator(node)
emitter = emitter(evaluator)
emitter.call(self, evaluator, node)
end
private
# Lookup evaluator for node
#
# @param [Node]
#
# @return [Class:Evaluator]
# if found
#
# @raise [Error::UnknownNode]
# otherwise
#
# @api private
#
def evaluator(node)
type = node.type
evaluators.fetch(type) do
fail Error::UnknownNode, type
end
end
# Return emitter for evaluator
#
# @param [Class:Evalautor]
#
# @return [#call]
#
# @api private
#
def emitter(evaluator)
emitters.each do |arity, emitter|
return emitter if evaluator.ancestors.include?(arity)
end
fail Error::UnknownNode, evaluator
end
end # Evaluator
end # Compiler
end # Morpher
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