-- module variable and administration local lm = { 	moduleInterface =  { 		suite  = 'LinkMail', 		serial = '2023-12-08', 		item   = 65157414 	} }  -- module import -- require( 'strict' ) local li = require( 'Module:Link utilities/i18n' ) local lu = require( 'Module:Link utilities' )  -- check single email address function lm._isEmail( s ) 	local result = 2  	if s == nil or type( s ) ~= 'string' or #s > 254 or s:find( '%s' ) or 		s:find( '%.%.' ) or s:find( '%.@' ) or s:find( '@[%.%-]' ) or 		s:find( '%-%.' ) or s:find( '%.%-' ) or s:match( '^%.' ) then 		return 0 	end 	local repl, at = s:gsub( '@', '@' )     if at ~= 1 then     	return 0     end  	at = s:find( '@' ) 	local user = s:sub( 1, at - 1 ) 	local domain = s:sub( at + 1, #s )     if not user or not domain or #user > 64 or #domain > 253 then     	return 0     end  	-- handle user part 	if not mw.ustring.match( user, "^[%w!#&'/=_`{|}~%^%$%%%+%-%*%.%?]+$" ) then 		return 0 	end 	if not user:match( "^[%w!#&'/=_`{|}~%^%$%%%+%-%*%.%?]+$" ) then 		result = 1 	end  	-- handle domain part 	if not mw.ustring.match( domain, '^[%w%.%-]+%.%a%a+$' ) then 		return 0 	end 	if not domain:match( '^[%w%.%-]+%.%a%a+$' ) then 		result = 1 	end  	-- not yet analysed: texts in quotes in user part 	-- added on demand  	return result end  function lm._linkMail( m, isDemo, ignoreUnicode ) 	m = mw.text.trim( m ) 	if m == '' then 		return '' 	end 	local catPrefix = '[[Category:' 	if isDemo then 		catPrefix = ' [[:Category:' 	end  	local comment = '' 	m, comment = lu.extractComment( m )  	m = m:gsub( 'mailto:', '' ) 	local isEmail = lm._isEmail( m ) 	local t 	if isEmail > 0 then 		t = '<span class="plainlinks nourlexpansion">[mailto:' .. m .. ' ' .. m .. ']</span>' 		if isEmail == 1 and not ignoreUnicode then 			t = t .. catPrefix .. li.categories.nonASCII 		end 	else 		t = m .. catPrefix .. li.categories.invalidMail 	end 	if comment ~= '' then 		t = t .. ' ' .. comment 	end 	return t end  function lm.linkMailSet( args ) 	args.email = args.email or args[ 1 ] or '' 	if args.email == '' then 		return '' 	end  	local ns     = mw.title.getCurrentTitle().namespace 	local isDemo = ns == 10 or ns == 828  	-- split separate email 	local items = lu.splitItems( args.email, li.delimiters ) 		 	-- analyse emails 	local result = '' 	local i = 0 	local s 	for j, item in ipairs( items ) do 		s = lm._linkMail( item, isDemo, args.ignoreUnicode ) 		if s ~= '' then 			if result == '' then 				result = s 			else 				if i == li.addMail then 					result = result .. '<span class="listing-add-contact">' 				end 				result = result .. li.texts.comma .. s 			end 			i = i + 1 		end 	end 	if i > li.addMail then 		result = result .. '</span>' 	end 	return result end  -- #invoke call function lm.linkMails( frame ) 	return lm.linkMailSet( frame.args ) end  -- template call function lm.linkMailsTemplate( frame ) 	return lm.linkMailSet( frame:getParent().args ) end  return lm