Module: Ruby3BackwardCompatibility::RegexpCompatibility::ClassMethods

Defined in:
lib/ruby3_backward_compatibility/compatibility/regexp.rb

Instance Method Summary collapse

Instance Method Details

#new(regexp_or_string, options = NOT_GIVEN, n_flag = NOT_GIVEN, **kwargs) ⇒ Object 



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# File 'lib/ruby3_backward_compatibility/compatibility/regexp.rb', line 14

def new(regexp_or_string, options = NOT_GIVEN, n_flag = NOT_GIVEN, **kwargs)
  if options == NOT_GIVEN
    super(regexp_or_string, **kwargs)
  elsif n_flag == 'n' || n_flag == 'N'
    unless options.is_a?(Integer)
      if RUBY_VERSION < '3.3' && options.is_a?(String) && options =~ LEGITIMATE_FLAGS
        # on Ruby 3.2 we can legitimately have options "mix" treated as flags, so parse them
        # on Ruby 3.3 this would never have been legitimate, since a third argument would not have been allowed
        new_options = 0
        new_options |= Regexp::MULTILINE if options.include?('m')
        new_options |= Regexp::IGNORECASE if options.include?('i')
        new_options |= Regexp::EXTENDED if options.include?('x')
        options = new_options
      else
        # on all other Ruby, truish is IGNORECASE
        options = options ? Regexp::IGNORECASE : 0
      end
    end
    super(regexp_or_string, options | Regexp::NOENCODING, **kwargs)
  elsif options.is_a?(String)
    if options =~ LEGITIMATE_FLAGS && n_flag == NOT_GIVEN
      # this (like any trueish value) would have been "ignore case" in Ruby < 3.2, but now is not
      # we have to assume this is Ruby 3.2 syntax
      super(regexp_or_string, options, **kwargs)
    else
      # this crashes on Ruby 3.2, so assume it is < 3.2 syntax
      super(regexp_or_string, true, **kwargs)
    end
  else
    super(regexp_or_string, options, **kwargs)
  end
end