Module:IPAddress: Difference between revisions

--[=[

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#Address_representations]]).

Unit tests at Module:IPAddress/tests

]=]

function _isIpV6( s )

if type( s ) ~= "string"

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( ":::" )

s, dcolon = s:gsub( "::", ":" )

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 ::

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 )

function _isIp( s )

return _isIpV4( s ) and "4" or _isIpV6( s ) and "6"

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