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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# Checks for uses of the keyword `not` instead of `!`.
#
# @example
#
# # bad - parentheses are required because of op precedence
# x = (not something)
#
# # good
# x = !something
#
class Not < Base
include RangeHelp
extend AutoCorrector
MSG = 'Use `!` instead of `not`.'
RESTRICT_ON_SEND = %i[!].freeze
OPPOSITE_METHODS = {
:== => :!=,
:!= => :==,
:<= => :>,
:> => :<=,
:< => :>=,
:>= => :<
}.freeze
def on_send(node)
return unless node.prefix_not?
add_offense(node.loc.selector) do |corrector|
range = range_with_surrounding_space(node.loc.selector, side: :right)
if opposite_method?(node.receiver)
correct_opposite_method(corrector, range, node.receiver)
elsif requires_parens?(node.receiver)
correct_with_parens(corrector, range, node)
else
correct_without_parens(corrector, range)
end
end
end
private
def opposite_method?(child)
child.send_type? && OPPOSITE_METHODS.key?(child.method_name)
end
def requires_parens?(child)
child.and_type? || child.or_type? ||
(child.send_type? && child.binary_operation?) ||
(child.if_type? && child.ternary?)
end
def correct_opposite_method(corrector, range, child)
corrector.remove(range)
corrector.replace(child.loc.selector, OPPOSITE_METHODS[child.method_name].to_s)
end
def correct_with_parens(corrector, range, node)
corrector.replace(range, '!(')
corrector.insert_after(node, ')')
end
def correct_without_parens(corrector, range)
corrector.replace(range, '!')
end
end
end
end
end
Version data entries
185 entries across 178 versions & 18 rubygems