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Module:IP: Difference between revisions
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implement IPAddress getNextIP and getPreviousIP
(add IPAddress __concat; minor style changes) |
(implement IPAddress getNextIP and getPreviousIP) |
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Line 182:
end
return false
end
local function copyChanged(parts, down)
-- Return a copy of IPv4 or IPv6 parts, incremented or decremented.
-- Will wraparound:
-- increment 255.255.255.255 → 0.0.0.0
-- ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff → ::
-- decrement 0.0.0.0 → 255.255.255.255
-- :: → ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
local result = { n = parts.n }
local carry = down and 0xffff or 1
for i = parts.n, 1, -1 do
local sum = parts[i] + carry
if sum >= 0x10000 then
carry = down and 0x10000 or 1
sum = sum - 0x10000
else
carry = down and 0xffff or 0
end
result[i] = sum
end
return result
end
Line 196 ⟶ 218:
-- Constructor
function IPAddress.new(ip, parts)
checkType('IPAddress.new', 1, ip, 'string')▼
-- Set up structure
Line 205 ⟶ 226:
-- Public methods
function obj:getIP()
return ipString(data.
end
Line 225 ⟶ 246:
function obj:getNextIP()
return IPAddress.new(IPAddress, copyChanged(data.parts))
end
function obj:getPreviousIP()
return IPAddress.new(IPAddress, copyChanged(data.parts, true))
end
Line 236 ⟶ 259:
-- Set initial values
else
▲ checkType('IPAddress.new', 1, ip, 'string')
error('invalid IP', 2)▼
if not (ipv4Address(data, ip) or ipv6Address(data, ip)) then
▲ error('invalid IP', 2)
end
end
data.version = data.parts.n == 2 and V4 or V6
return obj
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