instance method unpack_graphemes

# File activesupport/lib/active_support/multibyte/unicode.rb, line 81
      def unpack_graphemes(string)
        codepoints = string.codepoints.to_a
        unpacked = []
        pos = 0
        marker = 0
        eoc = codepoints.length
        while(pos < eoc)
          pos += 1
          previous = codepoints[pos-1]
          current = codepoints[pos]
          if (
              # CR X LF
              ( previous == database.boundary[:cr] and current == database.boundary[:lf] ) or
              # L X (L|V|LV|LVT)
              ( database.boundary[:l] === previous and in_char_class?(current, [:l,:v,:lv,:lvt]) ) or
              # (LV|V) X (V|T)
              ( in_char_class?(previous, [:lv,:v]) and in_char_class?(current, [:v,:t]) ) or
              # (LVT|T) X (T)
              ( in_char_class?(previous, [:lvt,:t]) and database.boundary[:t] === current ) or
              # X Extend
              (database.boundary[:extend] === current)
            )
          else
            unpacked << codepoints[marker..pos-1]
            marker = pos
          end
        end
        unpacked
      end