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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Performance
# This cop identifies places where `lstrip.rstrip` can be replaced by
# `strip`.
#
# @example
# # bad
# 'abc'.lstrip.rstrip
# 'abc'.rstrip.lstrip
#
# # good
# 'abc'.strip
class LstripRstrip < Cop
include RangeHelp
MSG = 'Use `strip` instead of `%<methods>s`.'.freeze
def_node_matcher :lstrip_rstrip, <<-PATTERN
{(send $(send _ $:rstrip) $:lstrip)
(send $(send _ $:lstrip) $:rstrip)}
PATTERN
def on_send(node)
lstrip_rstrip(node) do |first_send, method_one, method_two|
range = range_between(first_send.loc.selector.begin_pos,
node.source_range.end_pos)
add_offense(node,
location: range,
message: format(MSG,
methods: "#{method_one}.#{method_two}"))
end
end
def autocorrect(node)
range = range_between(node.receiver.loc.selector.begin_pos,
node.source_range.end_pos)
->(corrector) { corrector.replace(range, 'strip') }
end
end
end
end
end
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