in6_addr(left) private

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# File lib/ipaddr.rb, line 520
  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 $4
        left.count(':') <= 6 or raise ArgumentError, "invalid address"
        addr = in_addr($~[4,4])
        left = $1
        right = $3 + '0:0'
      else
        left.count(':') <= 7 or raise ArgumentError, "invalid address"
        left = $1
        right = $2
        addr = 0
      end
    else
      raise ArgumentError, "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
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