lib/mutest/mutator/node/block.rb
module Mutest
  class Mutator
    class Node
      # Emitter for mutations on 19 blocks
      class Block < self
        handle(:block)

        children :send, :arguments, :body

        private

        # Emit mutations
        #
        # @return [undefined]
        def dispatch
          emit_singletons
          emit(send) unless n_lambda?(send)
          emit_send_mutations(&method(:n_send?))
          emit_arguments_mutations

          mutate_body
        end

        # Emit body mutations
        #
        # @return [undefined]
        def mutate_body
          emit_body(nil)
          emit_body(N_RAISE)

          return unless body

          emit(body)
          emit_body_mutations

          mutate_body_receiver
        end

        # Mutate method send in body scope of `send`
        #
        # @return [undefined]
        def mutate_body_receiver
          return unless n_send?(body)

          body_meta = AST::Meta::Send.new(body)

          emit(s(:send, send, body_meta.selector, *body_meta.arguments))
        end
      end
    end
  end
end
