require('strict') local getArgs = require('Module:Arguments').getArgs  local p = {}  --[[--------------------------< I S _ S E T >------------------------------------------------------------------  Whether variable is set or not.  A variable is set when it is not nil and not empty.  ]]  local function is_set( var ) 	return not (var == nil or var == ''); end   --[[--------------------------< M A I N >----------------------------------------------------------------------  Template entry point.  This function takes up to two unnamed positional parameters: 	1 = coordinate string typically from a call to Wikidata like this: {{#property:P625|from=Q...}} 	2 = coordinate parameters; see Template:Coord 	 Also takes the named parameters |display=, |format=, |name=, |notes= which it passes on to {{coord}}  Reformats the Wikidata coordinate string into unnamed parameters for {{coord}}  {{#invoke:WikidataCoord|main|{{#property:P625|from={{{1}}}}}|{{{2}}}|display={{{display}}}|format={{{format}}}|name={{{name}}}|notes={{{notes}}}}}  ]]  function p.main (frame) 	local args = getArgs(frame); 	local lat_long = {};														-- table of lat/long coords extracted from wikidata return  	 	if not is_set (args[1]) then												-- in case wikidata returns nothing (happens when Q... is wrong) 		return '<span style="font-size:100%" class="error">{{WikidataCoord}} – missing coordinate data</span>';		-- error message and quit 	elseif mw.ustring.match (args[1], '%d+°%d+&#39;[%d%.]+&#34;[NS],%s*%d+°%d+&#39;[%d%.]+&#34;[EW]') then			-- if the returned data looks like 55°13&#39;12&#34;N, 23°17&#39;17&#34;E 		lat_long[1], lat_long[2], lat_long[3], lat_long[4], lat_long[5], lat_long[6], lat_long[7], lat_long[8] =	-- parse it into the table 			mw.ustring.match (args[1], '(%d+)°(%d+)&#39;([%d%.]+)&#34;([NS]),%s*(%d+)°(%d+)&#39;([%d%.]+)&#34;([EW])') 	elseif mw.ustring.match (args[1], '%d+°%d+&#39;[NS],%s*%d+°%d+&#39;[EW]') then									-- if the returned data looks like 54°24&#39;N, 25°25&#39;E 		lat_long[1], lat_long[2], lat_long[3], lat_long[4], lat_long[5], lat_long[6] =								-- parse it into the table 			mw.ustring.match (args[1], '(%d+)°(%d+)&#39;([NS]),%s*(%d+)°(%d+)&#39;([EW])') 	elseif mw.ustring.match (args[1], '%d+°%d+[′\'][%d%.]+[″\"][NS],?%s*%d+°%d+[′\'][%d%.]+[″\"][EW]') then			-- when args[1] is a dms string that uses quotes or primes 		lat_long[1], lat_long[2], lat_long[3], lat_long[4], lat_long[5], lat_long[6], lat_long[7], lat_long[8] =	-- parse it into the table 			mw.ustring.match (args[1], '(%d+)°(%d+)[′\']([%d%.]+)[″\"]([NS]),?%s*(%d+)°(%d+)[′\']([%d%.]+)[″\"]([EW])') 	elseif mw.ustring.match (args[1], '%d+°%d+[′\'][NS],?%s*%d+°%d+[′\'][EW]') then									-- when args[1] is a dms string that uses quotes or primes, bit shorter format 		lat_long[1], lat_long[2], lat_long[3], lat_long[4], lat_long[5], lat_long[6] =								-- parse it into the table 			mw.ustring.match (args[1], '(%d+)°(%d+)[′\']([NS]),?%s*(%d+)°(%d+)[′\']([EW])') 	elseif mw.ustring.match (args[1], '%d+%.?%d*°[NS],?%s*%d+%.?%d*°[EW]') then										-- when args[1] is a decimal degrees string 		lat_long[1], lat_long[2], lat_long[3], lat_long[4] =														-- parse it into the table 			mw.ustring.match (args[1], '(%d+%.?%d*)°([NS]),?%s*(%d+%.?%d*)°([EW])') 	else 		return '<span style="font-size:100%" class="error">{{WikidataCoord}} – malformed coordinate data</span>';	-- wikidata returned something else 	end  	if is_set (args[2]) then													-- coordinate parameters are in second unnammed positional parameter 		if is_set (lat_long[5]) then											-- set when args[1] format is dms 			lat_long[9]	= args[2]; 		else 			lat_long[5]	= args[2];												-- this one when args[1] is decimal degrees format 		end 	end 	if is_set (args.display) then 		lat_long.display = args.display; 	end 	if is_set (args.format) then 		lat_long.format = args.format; 	end 	if is_set (args.name) then 		lat_long.name = args.name; 	end 	if is_set (args.notes) then 		lat_long.notes = args.notes; 	end   	return frame:expandTemplate{title = 'coord', args = lat_long}				-- invoke template {{coord}} with wikidata lat/long end  return p;