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# frozen_string_literal: true
module Unparser
UnknownNodeError = Class.new(ArgumentError)
# Emitter base class
class Emitter
include Adamantium, AbstractType, Constants, Generation, NodeHelpers
include Anima.new(:buffer, :comments, :node, :local_variable_scope)
public :node
extend DSL
# Registry for node emitters
REGISTRY = {} # rubocop:disable Style/MutableConstant
NO_INDENT = %i[ensure rescue].freeze
module LocalVariableRoot
# Return local variable root
#
# @return [Parser::AST::Node]
#
# @api private
#
def local_variable_scope
AST::LocalVariableScope.new(node)
end
def self.included(descendant)
descendant.class_eval do
memoize :local_variable_scope
end
end
end # LocalVariableRoot
def node_type
node.type
end
# Register emitter for type
#
# @param [Symbol] types
#
# @return [undefined]
#
# @api private
#
def self.handle(*types)
types.each do |type|
fail "Handler for type: #{type} already registered" if REGISTRY.key?(type)
REGISTRY[type] = self
end
end
private_class_method :handle
def emit_mlhs
dispatch
end
# Return emitter
#
# @return [Emitter]
#
# @api private
#
# rubocop:disable Metrics/ParameterLists
def self.emitter(buffer:, comments:, node:, local_variable_scope:)
type = node.type
klass = REGISTRY.fetch(type) do
fail UnknownNodeError, "Unknown node type: #{type.inspect}"
end
klass.new(
buffer: buffer,
comments: comments,
local_variable_scope: local_variable_scope,
node: node
)
end
# rubocop:enable Metrics/ParameterLists
# Dispatch node write as statement
#
# @return [undefined]
#
# @api private
#
abstract_method :dispatch
end # Emitter
end # Unparser
|
