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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop check for uses of Object#freeze on immutable objects.
#
# @example
# # bad
# CONST = 1.freeze
#
# # good
# CONST = 1
class RedundantFreeze < Cop
include FrozenStringLiteral
MSG = 'Do not freeze immutable objects, as freezing them has no ' \
'effect.'.freeze
def on_send(node)
return unless node.receiver && node.method?(:freeze) &&
(immutable_literal?(node.receiver) ||
operation_produces_immutable_object?(node.receiver))
add_offense(node)
end
def autocorrect(node)
lambda do |corrector|
corrector.remove(node.loc.dot)
corrector.remove(node.loc.selector)
end
end
private
def immutable_literal?(node)
node = strip_parenthesis(node)
return true if node.immutable_literal?
FROZEN_STRING_LITERAL_TYPES.include?(node.type) &&
frozen_string_literals_enabled?
end
def strip_parenthesis(node)
if node.begin_type? && node.children.first
node.children.first
else
node
end
end
def_node_matcher :operation_produces_immutable_object?, <<-PATTERN
{
(begin (send {float int} {:+ :- :* :** :/ :% :<<} _))
(begin (send _ {:+ :- :* :** :/ :%} {float int}))
(begin (send _ {:== :=== :!= :<= :>= :< :>} _))
(send (const nil? :ENV) :[] _)
(send _ {:count :length :size} ...)
(block (send _ {:count :length :size} ...) ...)
}
PATTERN
end
end
end
end
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