method

slice

v2.2.1 - Show latest stable - Class: ActiveSupport::Multibyte::Chars

slice(*args)

public

Implements Unicode-aware slice with codepoints. Slicing on one point returns the codepoints for that character.

Example:

  'ããã«ã¡ã¯'.mb_chars.slice(2..3).to_s #=> "ã«ã¡"

# File activesupport/lib/active_support/multibyte/chars.rb, line 325
      def slice(*args)
        if args.size > 2
          raise ArgumentError, "wrong number of arguments (#{args.size} for 1)" # Do as if we were native
        elsif (args.size == 2 && !(args.first.is_a?(Numeric) || args.first.is_a?(Regexp)))
          raise TypeError, "cannot convert #{args.first.class} into Integer" # Do as if we were native
        elsif (args.size == 2 && !args[1].is_a?(Numeric))
          raise TypeError, "cannot convert #{args[1].class} into Integer" # Do as if we were native
        elsif args[0].kind_of? Range
          cps = self.class.u_unpack(@wrapped_string).slice(*args)
          result = cps.nil? ? nil : cps.pack('U*')
        elsif args[0].kind_of? Regexp
          result = @wrapped_string.slice(*args)
        elsif args.size == 1 && args[0].kind_of?(Numeric)
          character = self.class.u_unpack(@wrapped_string)[args[0]]
          result = character.nil? ? nil : [character].pack('U')
        else
          result = self.class.u_unpack(@wrapped_string).slice(*args).pack('U*')
        end
        result.nil? ? nil : chars(result)
      end

slice

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