method

[]=

v3.1.0 - Show latest stable - 0 notes - Class: ActiveSupport::Multibyte::Chars

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What's this?

[]=(*args) public

Like String#[]=, except instead of byte offsets you specify character offsets.

Example:

s = "MÃ¼ller"
s.mb_chars[2] = "e" # Replace character with offset 2
s
# => "MÃ¼eler"

s = "MÃ¼ller"
s.mb_chars[1, 2] = "Ã¶" # Replace 2 characters at character offset 1
s
# => "MÃ¶ler"

Show source

# File activesupport/lib/active_support/multibyte/chars.rb, line 265
      def []=(*args)
        replace_by = args.pop
        # Indexed replace with regular expressions already works
        if args.first.is_a?(Regexp)
          @wrapped_string[*args] = replace_by
        else
          result = Unicode.u_unpack(@wrapped_string)
          case args.first
          when Fixnum
            raise IndexError, "index #{args[0]} out of string" if args[0] >= result.length
            min = args[0]
            max = args[1].nil? ? min : (min + args[1] - 1)
            range = Range.new(min, max)
            replace_by = [replace_by].pack('U') if replace_by.is_a?(Fixnum)
          when Range
            raise RangeError, "#{args[0]} out of range" if args[0].min >= result.length
            range = args[0]
          else
            needle = args[0].to_s
            min = index(needle)
            max = min + Unicode.u_unpack(needle).length - 1
            range = Range.new(min, max)
          end
          result[range] = Unicode.u_unpack(replace_by)
          @wrapped_string.replace(result.pack('U*'))
        end
      end

[]=

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