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# frozen_string_literal: true
module RuboCop
module AST
# A node extension for `def` nodes. This will be used in place of a plain
# node when the builder constructs the AST, making its methods available
# to all `def` nodes within RuboCop.
class DefNode < Node
include ParameterizedNode
include MethodIdentifierPredicates
# Checks whether this node body is a void context.
#
# @return [Boolean] whether the `def` node body is a void context
def void_context?
method?(:initialize) || assignment_method?
end
# Checks whether this method definition node forwards its arguments
# as per the feature added in Ruby 2.7.
#
# @note This is written in a way that may support lead arguments
# which are rumored to be added in a later version of Ruby.
#
# @return [Boolean] whether the `def` node uses argument forwarding
def argument_forwarding?
arguments.any?(&:forward_args_type?) || arguments.any?(&:forward_arg_type?)
end
# The name of the defined method as a symbol.
#
# @return [Symbol] the name of the defined method
def method_name
children[-3]
end
# An array containing the arguments of the method definition.
#
# @return [Array<Node>] the arguments of the method definition
def arguments
children[-2]
end
# The body of the method definition.
#
# @note this can be either a `begin` node, if the method body contains
# multiple expressions, or any other node, if it contains a single
# expression.
#
# @return [Node] the body of the method definition
def body
children[-1]
end
# The receiver of the method definition, if any.
#
# @return [Node, nil] the receiver of the method definition, or `nil`.
def receiver
children[-4]
end
end
end
end
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