Module:IPAddress

--[=[ Functions are not "local", so other modules can require this module and call them directly. We return an object with 3 small stub functions to call the real ones so that the functions can be called from templates also.

Only dotted decimal notation for IPv4 supported. Does not support dotted hexadecimal, dotted octal, or single-number formats (see IPv4).

Unit tests at Module:IPAddress/tests ]=]

function _isIpV6( s ) local dcolon, groups if type( s ) ~= "string" or s:len == 0 or s:find( "[^:%x]" ) -- only colon and hex digits are legal chars or s:find( "^:[^:]" ) -- can begin or end with :: but not with single : or s:find( "[^:]:$" ) or s:find( ":::" ) then return false end s, dcolon = s:gsub( "::", ":" ) if dcolon > 1 then return false end -- at most one :: s = s:gsub( "^:?", ":" ) -- prepend : if needed, upper s, groups = s:gsub( ":%x%x?%x?%x?", "" ) -- remove valid groups, and count them return ( ( dcolon == 1 and groups < 8 ) or ( dcolon == 0 and groups == 8 ) ) and ( s:len == 0 or ( dcolon == 1 and s == ":" ) ) -- might be one dangling : if original ended with :: end

function _isIpV4( s ) local function legal( n ) return ( tonumber( n ) or 256 ) < 256 and not n:match("^0%d") end-- in lua 0 is true! if type( s ) ~= "string" then return false end local p1, p2, p3, p4 = s:match( "^(%d+)%.(%d+)%.(%d+)%.(%d+)$" ) return legal( p1 ) and legal( p2 ) and legal( p3 ) and legal( p4 ) end

function _isIp( s ) return _isIpV4( s ) and "4" or _isIpV6( s ) and "6" end

local p = {}

function p.isIpV6(frame) return _isIpV6( frame.args[ 1 ] ) and "1" or "0" end function p.isIpV4(frame) return _isIpV4( frame.args[ 1 ] ) and "1" or "0" end function p.isIp(frame) return _isIp( frame.args[ 1 ] ) or "" end

return p