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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Performance
# This cop identifies unnecessary use of a regex where `String#end_with?`
# would suffice.
#
# @example
# # bad
# 'abc'.match?(/bc\Z/)
# 'abc' =~ /bc\Z/
# 'abc'.match(/bc\Z/)
#
# # good
# 'abc'.end_with?('bc')
class EndWith < Cop
MSG = 'Use `String#end_with?` instead of a regex match anchored to ' \
'the end of the string.'.freeze
SINGLE_QUOTE = "'".freeze
def_node_matcher :redundant_regex?, <<-PATTERN
{(send $!nil? {:match :=~ :match?} (regexp (str $#literal_at_end?) (regopt)))
(send (regexp (str $#literal_at_end?) (regopt)) {:match :=~} $_)}
PATTERN
def literal_at_end?(regex_str)
# is this regexp 'literal' in the sense of only matching literal
# chars, rather than using metachars like . and * and so on?
# also, is it anchored at the end of the string?
regex_str =~ /\A(?:#{LITERAL_REGEX})+\\z\z/
end
def on_send(node)
return unless redundant_regex?(node)
add_offense(node)
end
def autocorrect(node)
redundant_regex?(node) do |receiver, regex_str|
receiver, regex_str = regex_str, receiver if receiver.is_a?(String)
regex_str = regex_str[0..-3] # drop \Z anchor
regex_str = interpret_string_escapes(regex_str)
lambda do |corrector|
new_source = receiver.source + '.end_with?(' +
to_string_literal(regex_str) + ')'
corrector.replace(node.source_range, new_source)
end
end
end
end
end
end
end
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