in6_addr

# File lib/ipaddr.rb, line 625
  def in6_addr(left)
    case left
    when RE_IPV6ADDRLIKE_FULL
      if $2
        addr = in_addr($~[2,4])
        left = $1 + ':'
      else
        addr = 0
      end
      right = ''
    when RE_IPV6ADDRLIKE_COMPRESSED
      if $4
        left.count(':') <= 6 or raise InvalidAddressError, "invalid address"
        addr = in_addr($~[4,4])
        left = $1
        right = $3 + '0:0'
      else
        left.count(':') <= ($1.empty? || $2.empty? ? 8 : 7) or
          raise InvalidAddressError, "invalid address"
        left = $1
        right = $2
        addr = 0
      end
    else
      raise InvalidAddressError, "invalid address"
    end
    l = left.split(':')
    r = right.split(':')
    rest = 8 - l.size - r.size
    if rest < 0
      return nil
    end
    (l + Array.new(rest, '0') + r).inject(0) { |i, s|
      i << 16 | s.hex
    } | addr
  end