Module:Location map
require('strict')
 
 local p = {}
 
 local getArgs = require('Module:Arguments').getArgs
 
 local function round(n, decimals)
 	local pow = 10^(decimals or 0)
 	return math.floor(n * pow + 0.5) / pow
 end
 
 function p.getMapParams(map, frame)
 	if not map then
 		error('The name of the location map definition to use must be specified', 2)
 	end
 	local moduletitle = mw.title.new('Module:Location map/data/' .. map)
 	if not moduletitle then
 		error(string.format('%q is not a valid name for a location map definition', map), 2)
 	elseif moduletitle.exists then
 		local mapData = mw.loadData('Module:Location map/data/' .. map)
 		return function(name, params)
 			if name == nil then
 				return 'Module:Location map/data/' .. map
 			elseif mapData[name] == nil then
 				return ''
 			elseif params then
 				return mw.message.newRawMessage(tostring(mapData[name]), unpack(params)):plain()
 			else
 				return mapData[name]
 			end
 		end
 	else
 		error('Unable to find the specified location map definition: &quot;Module:Location map/data/' .. map .. '&quot; does not exist', 2)
 	end
 end
 
 function p.data(frame, args, map)
 	if not args then
 		args = getArgs(frame, {frameOnly = true})
 	end
 	if not map then
 		map = p.getMapParams(args[1], frame)
 	end
 	local params = {}
 	for k,v in ipairs(args) do
 		if k &gt; 2 then
 			params[k-2] = v
 		end
 	end
 	return map(args[2], #params ~= 0 and params)
 end
 
 local hemisphereMultipliers = {
 	longitude = { W = -1, w = -1, E = 1, e = 1 },
 	latitude = { S = -1, s = -1, N = 1, n = 1 }
 }
 
 local function decdeg(degrees, minutes, seconds, hemisphere, decimal, direction)
 	if decimal then
 		if degrees then
 			error('Decimal and DMS degrees cannot both be provided for ' .. direction, 2)
 		elseif minutes then
 			error('Minutes can only be provided with DMS degrees for ' .. direction, 2)
 		elseif seconds then
 			error('Seconds can only be provided with DMS degrees for ' .. direction, 2)
 		elseif hemisphere then
 			error('A hemisphere can only be provided with DMS degrees for ' .. direction, 2)
 		end
 		local retval = tonumber(decimal)
 		if retval then
 			return retval
 		end
 		error('The value &quot;' .. decimal .. '&quot; provided for ' .. direction .. ' is not valid', 2)
 	elseif seconds and not minutes then
 		error('Seconds were provided for ' .. direction .. ' without minutes also being provided', 2)
 	elseif not degrees then
 		if minutes then
 			error('Minutes were provided for ' .. direction .. ' without degrees also being provided', 2)
 		elseif hemisphere then
 			error('A hemisphere was provided for ' .. direction .. ' without degrees also being provided', 2)
 		end
 		return nil
 	end
 	decimal = tonumber(degrees)
 	if not decimal then
 		error('The degree value &quot;' .. degrees .. '&quot; provided for ' .. direction .. ' is not valid', 2)
 	elseif minutes and not tonumber(minutes) then
 		error('The minute value &quot;' .. minutes .. '&quot; provided for ' .. direction .. ' is not valid', 2)
 	elseif seconds and not tonumber(seconds) then
 		error('The second value &quot;' .. seconds .. '&quot; provided for ' .. direction .. ' is not valid', 2)
 	end
 	decimal = decimal + (minutes or 0)/60 + (seconds or 0)/3600
 	if hemisphere then
 		local multiplier = hemisphereMultipliers[direction][hemisphere]
 		if not multiplier then
 			error('The hemisphere &quot;' .. hemisphere .. '&quot; provided for ' .. direction .. ' is not valid', 2)
 		end
 		decimal = decimal * multiplier
 	end
 	return decimal
 end
 
 -- Finds a parameter in a transclusion of {{Coord}}.
 local function coord2text(para,coord) -- this should be changed for languages which do not use Arabic numerals or the degree sign
 	local lat, long = mw.ustring.match(coord,'&lt;span class=&quot;p%-latitude latitude&quot;&gt;([^&lt;]+)&lt;/span&gt;&lt;span class=&quot;p%-longitude longitude&quot;&gt;([^&lt;]+)&lt;/span&gt;')
 	if lat then
 		return tonumber(para == 'longitude' and long or lat)
 	end
 	local result = mw.text.split(mw.ustring.match(coord,'%-?[%.%d]+°[NS] %-?[%.%d]+°[EW]') or '', '[ °]')
 	if para == 'longitude' then result = {result[3], result[4]} end
 	if not tonumber(result[1]) or not result[2] then
 		mw.log('Malformed coordinates value')
 		mw.logObject(para, 'para')
 		mw.logObject(coord, 'coord')
 		return error('Malformed coordinates value', 2)
 	end
 	return tonumber(result[1]) * hemisphereMultipliers[para][result[2]]
 end
 
 -- effectively make removeBlanks false for caption and maplink, and true for everything else
 -- if useWikidata is present but blank, convert it to false instead of nil
 -- p.top, p.bottom, and their callers need to use this
 function p.valueFunc(key, value)
 	if value then
 		value = mw.text.trim(value)
 	end
 	if value ~= '' or key == 'caption' or key == 'maplink' then
 		return value
 	elseif key == 'useWikidata' then
 		return false
 	end
 end
 
 local function getContainerImage(args, map)
 	if args.AlternativeMap then
 		return args.AlternativeMap
 	elseif args.relief then
         local digits = mw.ustring.match(args.relief,'^[1-9][0-9]?$') or '1' -- image1 to image99
         if map('image' .. digits) ~= '' then
             return map('image' .. digits)
         end
 	end
     return map('image')
 end
 
 function p.top(frame, args, map)
 	if not args then
 		args = getArgs(frame, {frameOnly = true, valueFunc = p.valueFunc})
 	end
 	if not map then
 		map = p.getMapParams(args[1], frame)
 	end
 	local width
 	local default_as_number = tonumber(mw.ustring.match(tostring(args.default_width),&quot;%d*&quot;))
 	if not args.width then
 		width = round((default_as_number or 240) * (tonumber(map('defaultscale')) or 1))
 	elseif mw.ustring.sub(args.width, -2) == 'px' then
 		width = mw.ustring.sub(args.width, 1, -3)
 	else
 		width = args.width
 	end
 	local width_as_number = tonumber(mw.ustring.match(tostring(width),&quot;%d*&quot;)) or 0;
     if width_as_number == 0 then
     	-- check to see if width is junk. If it is, then use default calculation
     	width = round((default_as_number or 240) * (tonumber(map('defaultscale')) or 1))
     	width_as_number = tonumber(mw.ustring.match(tostring(width),&quot;%d*&quot;)) or 0;
     end	
     if args.max_width ~= &quot;&quot; and args.max_width ~= nil then
         -- check to see if width bigger than max_width
         local max_as_number = tonumber(mw.ustring.match(args.max_width,&quot;%d*&quot;)) or 0;
         if width_as_number&gt;max_as_number and max_as_number&gt;0 then
             width = args.max_width;
         end
     end
 	local retval = frame:extensionTag{name = 'templatestyles', args = {src = 'Module:Location map/styles.css'}}
 	if args.float == 'center' then
 		retval = retval .. '&lt;div class=&quot;center&quot;&gt;'
 	end
 	if args.caption and args.caption ~= '' and args.border ~= 'infobox' then
 		retval = retval .. '&lt;div class=&quot;locmap noviewer noresize thumb '
 		if args.float == '&quot;left&quot;' or args.float == 'left' then
 			retval = retval .. 'tleft'
 		elseif args.float == '&quot;center&quot;' or args.float == 'center' or args.float == '&quot;none&quot;' or args.float == 'none' then
 			retval = retval .. 'tnone'
 		else
 			retval = retval .. 'tright'
 		end
 		retval = retval .. '&quot;&gt;&lt;div class=&quot;thumbinner&quot; style=&quot;width:' .. (width + 2) .. 'px'
 		if args.border == 'none' then
 			retval = retval .. ';border:none'
 		elseif args.border then
 			retval = retval .. ';border-color:' .. args.border
 		end
 		retval = retval .. '&quot;&gt;&lt;div style=&quot;position:relative;width:' .. width .. 'px' .. (args.border ~= 'none' and ';border:1px solid lightgray&quot;&gt;' or '&quot;&gt;')
 	else
 		retval = retval .. '&lt;div class=&quot;locmap&quot; style=&quot;width:' .. width .. 'px;'
 		if args.float == '&quot;left&quot;' or args.float == 'left' then
 			retval = retval .. 'float:left;clear:left'
 		elseif args.float == '&quot;center&quot;' or args.float == 'center' then
 			retval = retval .. 'float:none;clear:both;margin-left:auto;margin-right:auto'
 		elseif args.float == '&quot;none&quot;' or args.float == 'none' then
 			retval = retval .. 'float:none;clear:none'
 		else
 			retval = retval .. 'float:right;clear:right'
 		end
 		retval = retval .. '&quot;&gt;&lt;div style=&quot;width:' .. width .. 'px;padding:0&quot;&gt;&lt;div style=&quot;position:relative;width:' .. width .. 'px&quot;&gt;'
 	end
 	local image = getContainerImage(args, map)
 	local currentTitle = mw.title.getCurrentTitle()
 	retval = string.format(
 		'%s[[File:%s|%spx|%s%s|class=notpageimage]]',
 		retval,
 		image,
 		width,
 		args.alt or ((args.label or currentTitle.text) .. ' is located in ' .. map('name')),
 		args.maplink and ('|link=' .. args.maplink) or ''
 	)
 	if args.caption and args.caption ~= '' then
 		if (currentTitle.namespace == 0) and mw.ustring.find(args.caption, '##') then
 			retval = retval .. '[[Category:Pages using location map with a double number sign in the caption]]'
 		end
 	end
 	if args.overlay_image then
 		return retval .. '&lt;div style=&quot;position:absolute;top:0;left:0&quot;&gt;[[File:' .. args.overlay_image .. '|' .. width .. 'px|class=notpageimage]]&lt;/div&gt;'
 	else
 		return retval
 	end
 end
 
 function p.bottom(frame, args, map)
 	if not args then
 		args = getArgs(frame, {frameOnly = true, valueFunc = p.valueFunc})
 	end
 	if not map then
 		map = p.getMapParams(args[1], frame)
 	end
 	local retval = '&lt;/div&gt;'
 	local currentTitle = mw.title.getCurrentTitle()
 	if not args.caption or args.border == 'infobox' then
 		if args.border then
 			retval = retval .. '&lt;div style=&quot;padding-top:0.2em&quot;&gt;'
 		else
 			retval = retval .. '&lt;div style=&quot;font-size:91%;padding-top:3px&quot;&gt;'
 		end
 		retval = retval
 		.. (args.caption or (args.label or currentTitle.text) .. ' (' .. map('name') .. ')')
 		.. '&lt;/div&gt;'
 	elseif args.caption ~= ''  then
 		-- This is not the pipe trick. We're creating a link with no text on purpose, so that CSS can give us a nice image
 		retval = retval .. '&lt;div class=&quot;thumbcaption&quot;&gt;&lt;div class=&quot;magnify&quot;&gt;[[:File:' .. getContainerImage(args, map) .. '|class=notpageimage| ]]&lt;/div&gt;' .. args.caption .. '&lt;/div&gt;'
 	end
 
 	if args.switcherLabel then
 		retval = retval .. '&lt;span class=&quot;switcher-label&quot; style=&quot;display:none&quot;&gt;' .. args.switcherLabel .. '&lt;/span&gt;'
 	elseif args.autoSwitcherLabel then
 		retval = retval .. '&lt;span class=&quot;switcher-label&quot; style=&quot;display:none&quot;&gt;Show map of ' .. map('name') .. '&lt;/span&gt;'
 	end
 	
 	retval = retval .. '&lt;/div&gt;&lt;/div&gt;'
 	if args.caption_undefined then
 		mw.log('Removed parameter caption_undefined used.')
 		local parent = frame:getParent()
 		if parent then
 			mw.log('Parent is ' .. parent:getTitle())
 		end
 		mw.logObject(args, 'args')
 		if currentTitle.namespace == 0 then
 		    retval = retval .. '[[Category:Location maps with removed parameters|caption_undefined]]'
 		end
 	end
 	if map('skew') ~= '' or map('lat_skew') ~= '' or map('crosses180') ~= '' or map('type') ~= '' then
 		mw.log('Removed parameter used in map definition ' .. map())
 		if currentTitle.namespace == 0 then
 		    local key = (map('skew') ~= '' and 'skew' or '') ..
 					(map('lat_skew') ~= '' and 'lat_skew' or '') ..
 					(map('crosses180') ~= '' and 'crosses180' or '') ..
 					(map('type') ~= '' and 'type' or '')
 		    retval = retval .. '[[Category:Location maps with removed parameters|' .. key .. ' ]]'
 		end
 	end
 	if string.find(map('name'), '|', 1, true) then
 		mw.log('Pipe used in name of map definition ' .. map())
 		if currentTitle.namespace == 0 then
 		   retval = retval .. '[[Category:Location maps with a name containing a pipe]]'
 		end
 	end
 	if args.float == 'center' then
 		retval = retval .. '&lt;/div&gt;'
 	end
 	return retval
 end
 
 local function markOuterDiv(x, y, imageDiv, labelDiv)
 	return mw.html.create('div')
 		:addClass('od')
 		:addClass('notheme')  -- T236137
 		:cssText('top:' .. round(y, 3) .. '%;left:' .. round(x, 3) .. '%')
 		:node(imageDiv)
 		:node(labelDiv)
 end
 
 local function markImageDiv(mark, marksize, label, link, alt, title)
 	local builder = mw.html.create('div')
 		:addClass('id')
 		:cssText('left:-' .. round(marksize / 2) .. 'px;top:-' .. round(marksize / 2) .. 'px')
 		:attr('title', title)
 	if marksize ~= 0 then
 		builder:wikitext(string.format(
 			'[[File:%s|%dx%dpx|%s|link=%s%s|class=notpageimage]]',
 			mark,
 			marksize,
 			marksize,
 			label,
 			link,
 			alt and ('|alt=' .. alt) or ''
 		))
 	end
 	return builder
 end
 
 local function markLabelDiv(label, label_size, label_width, position, background, x, marksize)
 	if tonumber(label_size) == 0 then
 		return mw.html.create('div'):addClass('l0'):wikitext(label)
 	end
 	local builder = mw.html.create('div')
 		:cssText('font-size:' .. label_size .. '%;width:' .. label_width .. 'em')
 	local distance = round(marksize / 2 + 1)
 	if position == 'top' then -- specified top
 		builder:addClass('pv'):cssText('bottom:' .. distance .. 'px;left:' .. (-label_width / 2) .. 'em')
 	elseif position == 'bottom' then -- specified bottom
 		builder:addClass('pv'):cssText('top:' .. distance .. 'px;left:' .. (-label_width / 2) .. 'em')
 	elseif position == 'left' or (tonumber(x) &gt; 70 and position ~= 'right') then -- specified left or autodetected to left
 		builder:addClass('pl'):cssText('right:' .. distance .. 'px')
 	else -- specified right or autodetected to right
 		builder:addClass('pr'):cssText('left:' .. distance .. 'px')
 	end
 	builder = builder:tag('div')
 		:wikitext(label)
 	if background then
 		builder:cssText('background-color:' .. background)
 	end
 	return builder:done()
 end
 
 local function getX(longitude, left, right)
 	local width = (right - left) % 360
 	if width == 0 then
 		width = 360
 	end
 	local distanceFromLeft = (longitude - left) % 360
 	-- the distance needed past the map to the right equals distanceFromLeft - width. the distance needed past the map to the left equals 360 - distanceFromLeft. to minimize page stretching, go whichever way is shorter
 	if distanceFromLeft - width / 2 &gt;= 180 then
 		distanceFromLeft = distanceFromLeft - 360
 	end
 	return 100 * distanceFromLeft / width
 end
 
 local function getY(latitude, top, bottom)
 	return 100 * (top - latitude) / (top - bottom)
 end
 
 function p.mark(frame, args, map)
 	if not args then
 		args = getArgs(frame, {wrappers = 'Template:Location map~'})
 	end
 	local mapnames = {}
 	if not map then
 		if args[1] then
 			map = {}
 			for mapname in mw.text.gsplit(args[1], '#', true) do
 				map[#map + 1] = p.getMapParams(mw.ustring.gsub(mapname, '^%s*(.-)%s*$', '%1'), frame)
 				mapnames[#mapnames + 1] = mapname
 			end
 			if #map == 1 then map = map[1] end
 		else
 			map = p.getMapParams('World', frame)
 			args[1] = 'World'
 		end
 	end
 	if type(map) == 'table' then
 		local outputs = {}
 		local oldargs = args[1]
 		for k,v in ipairs(map) do
 			args[1] = mapnames[k]
 			outputs[k] = tostring(p.mark(frame, args, v))
 		end
 		args[1] = oldargs
 		return table.concat(outputs, '#PlaceList#') .. '#PlaceList#'
 	end
 	local x, y, longitude, latitude
 	longitude = decdeg(args.lon_deg, args.lon_min, args.lon_sec, args.lon_dir, args.long, 'longitude')
 	latitude = decdeg(args.lat_deg, args.lat_min, args.lat_sec, args.lat_dir, args.lat, 'latitude')
 	if args.excludefrom then
 		-- If this mark is to be excluded from certain maps entirely (useful in the context of multiple maps)
 		for exclusionmap in mw.text.gsplit(args.excludefrom, '#', true) do
 			-- Check if this map is excluded. If so, return an empty string.
 			if args[1] == exclusionmap then
 				return ''
 			end
 		end
 			
 	end
 	local builder = mw.html.create()
 	local currentTitle = mw.title.getCurrentTitle()
 	if args.coordinates then
 --		Temporarily removed to facilitate infobox conversion. See [[Wikipedia:Coordinates in infoboxes]]
 
 --		if longitude or latitude then
 --			error('Coordinates from [[Module:Coordinates]] and individual coordinates cannot both be provided')
 --		end
 		longitude = coord2text('longitude', args.coordinates)
 		latitude = coord2text('latitude', args.coordinates)
 	elseif not longitude and not latitude and args.useWikidata then
 		-- If they didn't provide either coordinate, try Wikidata. If they provided one but not the other, don't.
 		local entity = mw.wikibase.getEntity()
 		if entity and entity.claims and entity.claims.P625 and entity.claims.P625[1].mainsnak.snaktype == 'value' then
 			local value = entity.claims.P625[1].mainsnak.datavalue.value
 			longitude, latitude = value.longitude, value.latitude
 		end
 		if args.link and (currentTitle.namespace == 0) then
 			builder:wikitext('[[Category:Location maps with linked markers with coordinates from Wikidata]]')	
 		end
 	end
 	if not longitude then
 		error('No value was provided for longitude')
 	elseif not latitude then
 		error('No value was provided for latitude')
 	end
 	if currentTitle.namespace &gt; 0 then
 		if (not args.lon_deg) ~= (not args.lat_deg) then
 			builder:wikitext('[[Category:Location maps with different longitude and latitude precisions|Degrees]]')
 		elseif (not args.lon_min) ~= (not args.lat_min) then
 			builder:wikitext('[[Category:Location maps with different longitude and latitude precisions|Minutes]]')
 		elseif (not args.lon_sec) ~= (not args.lat_sec) then
 			builder:wikitext('[[Category:Location maps with different longitude and latitude precisions|Seconds]]')
 		elseif (not args.lon_dir) ~= (not args.lat_dir) then
 			builder:wikitext('[[Category:Location maps with different longitude and latitude precisions|Hemisphere]]')
 		elseif (not args.long) ~= (not args.lat) then
 			builder:wikitext('[[Category:Location maps with different longitude and latitude precisions|Decimal]]')
 		end
 	end
 	if ((tonumber(args.lat_deg) or 0) &lt; 0) and ((tonumber(args.lat_min) or 0) ~= 0 or (tonumber(args.lat_sec) or 0) ~= 0 or (args.lat_dir and args.lat_dir ~='')) then
 		builder:wikitext('[[Category:Location maps with negative degrees and minutes or seconds]]')
 	end
 	if ((tonumber(args.lon_deg) or 0) &lt; 0) and ((tonumber(args.lon_min) or 0) ~= 0 or (tonumber(args.lon_sec) or 0) ~= 0 or (args.lon_dir and args.lon_dir ~= '')) then
 		builder:wikitext('[[Category:Location maps with negative degrees and minutes or seconds]]')
 	end
 	if (((tonumber(args.lat_min) or 0) &lt; 0) or ((tonumber(args.lat_sec) or 0) &lt; 0)) then
 		builder:wikitext('[[Category:Location maps with negative degrees and minutes or seconds]]')
 	end
 	if (((tonumber(args.lon_min) or 0) &lt; 0) or ((tonumber(args.lon_sec) or 0) &lt; 0)) then
 		builder:wikitext('[[Category:Location maps with negative degrees and minutes or seconds]]')
 	end
 	if args.skew or args.lon_shift or args.markhigh then
 		mw.log('Removed parameter used in invocation.')
 		local parent = frame:getParent()
 		if parent then
 			mw.log('Parent is ' .. parent:getTitle())
 		end
 		mw.logObject(args, 'args')
 		if currentTitle.namespace == 0 then
 			local key = (args.skew and 'skew' or '') ..
 						(args.lon_shift and 'lon_shift' or '') ..
 						(args.markhigh and 'markhigh' or '')
 			builder:wikitext('[[Category:Location maps with removed parameters|' .. key ..' ]]')
 		end
 	end
 	if map('x') ~= '' then
 		x = tonumber(mw.ext.ParserFunctions.expr(map('x', { latitude, longitude })))
 	else
 		x = tonumber(getX(longitude, map('left'), map('right')))
 	end
 	if map('y') ~= '' then
 		y = tonumber(mw.ext.ParserFunctions.expr(map('y', { latitude, longitude })))
 	else
 		y = tonumber(getY(latitude, map('top'), map('bottom')))
 	end
 	if (x &lt; 0 or x &gt; 100 or y &lt; 0 or y &gt; 100) and not args.outside then
 		mw.log('Mark placed outside map boundaries without outside flag set. x = ' .. x .. ', y = ' .. y)
 		local parent = frame:getParent()
 		if parent then
 			mw.log('Parent is ' .. parent:getTitle())
 		end
 		mw.logObject(args, 'args')
 		if currentTitle.namespace == 0 then
 			local key = currentTitle.prefixedText
 			builder:wikitext('[[Category:Location maps with marks outside map and outside parameter not set|' .. key .. ' ]]')
 		end
 	end
 	local mark = args.mark or map('mark')
 	if mark == '' then
 		mark = 'Red pog.svg'
 	end
 	local marksize = tonumber(args.marksize) or tonumber(map('marksize')) or 8
 	local imageDiv = markImageDiv(mark, marksize, args.label or mw.title.getCurrentTitle().text, args.link or '', args.alt, args[2])
 	local labelDiv
 	if args.label and args.position ~= 'none' then
 		labelDiv = markLabelDiv(args.label, args.label_size or 91, args.label_width or 6, args.position, args.background, x, marksize)
 	end
 	return builder:node(markOuterDiv(x, y, imageDiv, labelDiv))
 end
 
 local function switcherSeparate(s)
 	if s == nil then return {} end
 	local retval = {}
 	for i in string.gmatch(s .. '#', '([^#]*)#') do
 		i = mw.text.trim(i)
 		retval[#retval + 1] = (i ~= '' and i)
 	end
 	return retval
 end
 
 function p.main(frame, args, map)
 	local caption_list = {}
 	if not args then
 		args = getArgs(frame, {wrappers = 'Template:Location map', valueFunc = p.valueFunc})
 	end
 	if args.useWikidata == nil then
 		args.useWikidata = true
 	end
 	if not map then
 		if args[1] then
 			map = {}
 			for mapname in string.gmatch(args[1], '[^#]+') do
 				map[#map + 1] = p.getMapParams(mw.ustring.gsub(mapname, '^%s*(.-)%s*$', '%1'), frame)
 			end
 			if args['caption'] then
 				if args['caption'] == &quot;&quot; then
 					while #caption_list &lt; #map do
 						caption_list[#caption_list + 1] = args['caption']
 					end
 				else
 					for caption in mw.text.gsplit(args['caption'], '##', true) do
 						caption_list[#caption_list + 1] = caption
 					end
 				end
 			end
 			if #map == 1 then map = map[1] end
 		else
 			map = p.getMapParams('World', frame)
 		end
 	end
 	if type(map) == 'table' then
 		local altmaps = switcherSeparate(args.AlternativeMap)
 		if #altmaps &gt; #map then
 			error(string.format('%d AlternativeMaps were provided, but only %d maps were provided', #altmaps, #map))
 		end
 		local overlays = switcherSeparate(args.overlay_image)
 		if #overlays &gt; #map then
 			error(string.format('%d overlay_images were provided, but only %d maps were provided', #overlays, #map))
 		end
 		if #caption_list &gt; #map then
 			error(string.format('%d captions were provided, but only %d maps were provided', #caption_list, #map))
 		end
 		local outputs = {}
 		args.autoSwitcherLabel = true
 		for k,v in ipairs(map) do
 			args.AlternativeMap = altmaps[k]
 			args.overlay_image = overlays[k]
 			args.caption = caption_list[k]
 			outputs[k] = p.main(frame, args, v)
 		end
 		return '&lt;div class=&quot;switcher-container&quot;&gt;' .. table.concat(outputs) .. '&lt;/div&gt;'
 	else
 		return p.top(frame, args, map) .. tostring( p.mark(frame, args, map) ) .. p.bottom(frame, args, map)
 	end
 end