Module:IPAddress

-- functions are not "local", so other modules can require this module and call them directly. we return a table with 3 small stub functions to call the "real" ones, in a scribunto fashion, so the functions can be called from templates also.

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 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

-- return a table to allow the functions to be called from templates return { ["isIpV6"] = function( frame ) return isIpV6( frame.args[ 1 ] ) and "1" or "0" end, ["isIpV4"] = function( frame ) return isIpV4( frame.args[ 1 ] ) and "1" or "0" end, ["isIp"] = function( frame ) return isIp( frame.args[ 1 ] ) or "" end }