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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# Checks for exact regexp match inside Regexp literals.
#
# @example
#
# # bad
# string =~ /\Astring\z/
# string === /\Astring\z/
# string.match(/\Astring\z/)
# string.match?(/\Astring\z/)
#
# # good
# string == 'string'
#
# # bad
# string !~ /\Astring\z/
#
# # good
# string != 'string'
#
class ExactRegexpMatch < Base
extend AutoCorrector
MSG = 'Use `%<prefer>s`.'
RESTRICT_ON_SEND = %i[=~ === !~ match match?].freeze
# @!method exact_regexp_match(node)
def_node_matcher :exact_regexp_match, <<~PATTERN
(call
_ {:=~ :=== :!~ :match :match?}
(regexp
(str $_)
(regopt)))
PATTERN
def on_send(node)
return unless (regexp = exact_regexp_match(node))
parsed_regexp = Regexp::Parser.parse(regexp)
return unless exact_match_pattern?(parsed_regexp)
prefer = "#{node.receiver.source} #{new_method(node)} '#{parsed_regexp[1].text}'"
add_offense(node, message: format(MSG, prefer: prefer)) do |corrector|
corrector.replace(node, prefer)
end
end
alias on_csend on_send
private
def exact_match_pattern?(parsed_regexp)
tokens = parsed_regexp.map(&:token)
return false unless tokens[0] == :bos && tokens[1] == :literal && tokens[2] == :eos
!parsed_regexp[1].quantifier
end
def new_method(node)
node.method?(:!~) ? '!=' : '=='
end
end
end
end
end
Version data entries
18 entries across 18 versions & 5 rubygems