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module Morpher
class Compiler
class Preprocessor
# Abstract preprocessor emitter
class Emitter < Compiler::Emitter
include Registry, Concord.new(:preprocessor, :node)
# Return output
#
# @return [AST::Node]
#
# @api private
#
def output
validate_node
processed_node
end
memoize :output
private
# Visit node
#
# @param [Node] node
# original untransformed node
#
# @return [Node]
# transformed node
#
# @api private
#
def visit(node)
preprocessor.call(node)
end
# Validate node
#
# @return [undefined]
# if successful
#
# @raise [Error]
# otherwise
#
# @api private
#
def validate_node
assert_children_amount(named_children.length)
end
end # Emitter
end # Preprocessor
end # Compiler
end # Morpher
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