Module:Infobox
--
 -- This module implements {{Infobox}}
 --
 
 local p = {}
 
 local navbar = require('Module:Navbar')._navbar
 
 local args = {}
 local origArgs = {}
 local root
 
 local function notempty( s ) return s and s:match( '%S' ) end
 
 local function fixChildBoxes(sval, tt)
 	if notempty(sval) then
 		local marker = '&lt;span class=special_infobox_marker&gt;'
 		local s = sval
 		s = mw.ustring.gsub(s, '(&lt;%s*[Tt][Rr])', marker .. '%1')
 		s = mw.ustring.gsub(s, '(&lt;/[Tt][Rr]%s*&gt;)', '%1' .. marker)
 		if s:match(marker) then
 			s = mw.ustring.gsub(s, marker .. '%s*' .. marker, '')
 			s = mw.ustring.gsub(s, '([\r\n]|-[^\r\n]*[\r\n])%s*' .. marker, '%1')
 			s = mw.ustring.gsub(s, marker .. '%s*([\r\n]|-)', '%1')
 			s = mw.ustring.gsub(s, '(&lt;/[Cc][Aa][Pp][Tt][Ii][Oo][Nn]%s*&gt;%s*)' .. marker, '%1')
 			s = mw.ustring.gsub(s, '(&lt;%s*[Tt][Aa][Bb][Ll][Ee][^&lt;&gt;]*&gt;%s*)' .. marker, '%1')
 			s = mw.ustring.gsub(s, '^(%{|[^\r\n]*[\r\n]%s*)' .. marker, '%1')
 			s = mw.ustring.gsub(s, '([\r\n]%{|[^\r\n]*[\r\n]%s*)' .. marker, '%1')
 			s = mw.ustring.gsub(s, marker .. '(%s*&lt;/[Tt][Aa][Bb][Ll][Ee]%s*&gt;)', '%1')
 			s = mw.ustring.gsub(s, marker .. '(%s*\n|%})', '%1')
 		end
 		if s:match(marker) then
 			local subcells = mw.text.split(s, marker)
 			s = ''
 			for k = 1, #subcells do
 				if k == 1 then
 					s = s .. subcells[k] .. '&lt;/' .. tt .. '&gt;&lt;/tr&gt;'
 				elseif k == #subcells then
 					local rowstyle = ' style=&quot;display:none&quot;'
 					if notempty(subcells[k]) then rowstyle = ''	end
 					s = s .. '&lt;tr' .. rowstyle ..'&gt;&lt;' .. tt .. ' colspan=2&gt;\n' .. subcells[k]
 				elseif notempty(subcells[k]) then
 					if (k % 2) == 0 then
 						s = s .. subcells[k]
 					else
 						s = s .. '&lt;tr&gt;&lt;' .. tt .. ' colspan=2&gt;\n' .. subcells[k] .. '&lt;/' .. tt .. '&gt;&lt;/tr&gt;'
 					end
 				end
 			end
 		end
 		-- the next two lines add a newline at the end of lists for the PHP parser
 		-- https://en.wikipedia.org/w/index.php?title=Template_talk:Infobox_musical_artist&amp;oldid=849054481
 		-- remove when [[:phab:T191516]] is fixed or OBE
 		s = mw.ustring.gsub(s, '([\r\n][%*#;:][^\r\n]*)$', '%1\n')
 		s = mw.ustring.gsub(s, '^([%*#;:][^\r\n]*)$', '%1\n')
 		s = mw.ustring.gsub(s, '^([%*#;:])', '\n%1')
 		s = mw.ustring.gsub(s, '^(%{%|)', '\n%1')
 		return s
 	else
 		return sval
 	end
 end
 
 local function union(t1, t2)
 	-- Returns the union of the values of two tables, as a sequence.
 	local vals = {}
 	for k, v in pairs(t1) do
 		vals[v] = true
 	end
 	for k, v in pairs(t2) do
 		vals[v] = true
 	end
 	local ret = {}
 	for k, v in pairs(vals) do
 		table.insert(ret, k)
 	end
 	return ret
 end
 
 local function getArgNums(prefix)
 	-- Returns a table containing the numbers of the arguments that exist
 	-- for the specified prefix. For example, if the prefix was 'data', and
 	-- 'data1', 'data2', and 'data5' exist, it would return {1, 2, 5}.
 	local nums = {}
 	for k, v in pairs(args) do
 		local num = tostring(k):match('^' .. prefix .. '([1-9]%d*)$')
 		if num then table.insert(nums, tonumber(num)) end
 	end
 	table.sort(nums)
 	return nums
 end
 
 local function addRow(rowArgs)
 	-- Adds a row to the infobox, with either a header cell
 	-- or a label/data cell combination.
 	if rowArgs.header and rowArgs.header ~= '_BLANK_' then
 		root
 			:tag('tr')
 				:addClass(rowArgs.rowclass)
 				:cssText(rowArgs.rowstyle)
 				:attr('id', rowArgs.rowid)
 				:tag('th')
 					:attr('colspan', 2)
 					:attr('id', rowArgs.headerid)
 					:addClass(rowArgs.class)
 					:addClass(args.headerclass)
 					:css('text-align', 'center')
 					:cssText(args.headerstyle)
 					:cssText(rowArgs.rowcellstyle)
 					:wikitext(fixChildBoxes(rowArgs.header, 'th'))
 		if rowArgs.data then
 			root:wikitext('[[Category:Pages which use infobox templates with ignored data cells]]')
 		end
 	elseif rowArgs.data then
 		if not rowArgs.data:gsub('%[%[%s*[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]%s*:[^]]*]]', ''):match('^%S') then
 			rowArgs.rowstyle = 'display:none'
 		end
 		local row = root:tag('tr')
 		row:addClass(rowArgs.rowclass)
 		row:cssText(rowArgs.rowstyle)
 		row:attr('id', rowArgs.rowid)
 		if rowArgs.label then
 			row
 				:tag('th')
 					:attr('scope', 'row')
 					:attr('id', rowArgs.labelid)
 					:cssText(args.labelstyle)
 					:cssText(rowArgs.rowcellstyle)
 					:wikitext(rowArgs.label)
 					:done()
 		end
 
 		local dataCell = row:tag('td')
 		if not rowArgs.label then
 			dataCell
 				:attr('colspan', 2)
 				:css('text-align', 'center')
 		end
 		dataCell
 			:attr('id', rowArgs.dataid)
 			:addClass(rowArgs.class)
 			:cssText(rowArgs.datastyle)
 			:cssText(rowArgs.rowcellstyle)
 			:wikitext(fixChildBoxes(rowArgs.data, 'td'))
 	end
 end
 
 local function renderTitle()
 	if not args.title then return end
 
 	root
 		:tag('caption')
 			:addClass(args.titleclass)
 			:cssText(args.titlestyle)
 			:wikitext(args.title)
 end
 
 local function renderAboveRow()
 	if not args.above then return end
 
 	root
 		:tag('tr')
 			:tag('th')
 				:attr('colspan', 2)
 				:addClass(args.aboveclass)
 				:css('text-align', 'center')
 				:css('font-size', '125%')
 				:css('font-weight', 'bold')
 				:cssText(args.abovestyle)
 				:wikitext(fixChildBoxes(args.above,'th'))
 end
 
 local function renderBelowRow()
 	if not args.below then return end
 
 	root
 		:tag('tr')
 			:tag('td')
 				:attr('colspan', '2')
 				:addClass(args.belowclass)
 				:css('text-align', 'center')
 				:cssText(args.belowstyle)
 				:wikitext(fixChildBoxes(args.below,'td'))
 end
 
 local function renderSubheaders()
 	if args.subheader then
 		args.subheader1 = args.subheader
 	end
 	if args.subheaderrowclass then
 		args.subheaderrowclass1 = args.subheaderrowclass
 	end
 	local subheadernums = getArgNums('subheader')
 	for k, num in ipairs(subheadernums) do
 		addRow({
 			data = args['subheader' .. tostring(num)],
 			datastyle = args.subheaderstyle,
 			rowcellstyle = args['subheaderstyle' .. tostring(num)],
 			class = args.subheaderclass,
 			rowclass = args['subheaderrowclass' .. tostring(num)]
 		})
 	end
 end
 
 local function renderImages()
 	if args.image then
 		args.image1 = args.image
 	end
 	if args.caption then
 		args.caption1 = args.caption
 	end
 	local imagenums = getArgNums('image')
 	for k, num in ipairs(imagenums) do
 		local caption = args['caption' .. tostring(num)]
 		local data = mw.html.create():wikitext(args['image' .. tostring(num)])
 		if caption then
 			data
 				:tag('div')
 					:cssText(args.captionstyle)
 					:wikitext(caption)
 		end
 		addRow({
 			data = tostring(data),
 			datastyle = args.imagestyle,
 			class = args.imageclass,
 			rowclass = args['imagerowclass' .. tostring(num)]
 		})
 	end
 end
 
 local function preprocessRows()
 	-- Gets the union of the header and data argument numbers,
 	-- and renders them all in order using addRow.
 	local rownums = union(getArgNums('header'), getArgNums('data'))
 	table.sort(rownums)
 	local lastheader
 	for k, num in ipairs(rownums) do
 		if args['header' .. tostring(num)] then
 			if lastheader then
 				args['header' .. tostring(lastheader)] = nil
 			end
 			lastheader = num
 		elseif args['data' .. tostring(num)] and args['data' .. tostring(num)]:gsub('%[%[%s*[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]%s*:[^]]*]]', ''):match('^%S') then
 			local data = args['data' .. tostring(num)]
 			if data:gsub('%[%[%s*[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]%s*:[^]]*]]', ''):match('%S') then
 				lastheader = nil
 			end
 		end
 	end
 	if lastheader then
 		args['header' .. tostring(lastheader)] = nil
 	end
 end
 
 local function renderRows()
 	-- Gets the union of the header and data argument numbers,
 	-- and renders them all in order using addRow.
 	local rownums = union(getArgNums('header'), getArgNums('data'))
 	table.sort(rownums)
 	for k, num in ipairs(rownums) do
 		addRow({
 			header = args['header' .. tostring(num)],
 			label = args['label' .. tostring(num)],
 			data = args['data' .. tostring(num)],
 			datastyle = args.datastyle,
 			class = args['class' .. tostring(num)],
 			rowclass = args['rowclass' .. tostring(num)],
 			rowstyle = args['rowstyle' .. tostring(num)],
 			rowcellstyle = args['rowcellstyle' .. tostring(num)],
 			dataid = args['dataid' .. tostring(num)],
 			labelid = args['labelid' .. tostring(num)],
 			headerid = args['headerid' .. tostring(num)],
 			rowid = args['rowid' .. tostring(num)]
 		})
 	end
 end
 
 local function renderNavBar()
 	if not args.name then return end
 
 	root
 		:tag('tr')
 			:tag('td')
 				:attr('colspan', '2')
 				:css('text-align', 'right')
 				:wikitext(navbar{
 					args.name,
 					mini = 1,
 				})
 end
 
 local function renderItalicTitle()
 	local italicTitle = args['italic title'] and mw.ustring.lower(args['italic title'])
 	if italicTitle == '' or italicTitle == 'force' or italicTitle == 'yes' then
 		root:wikitext(mw.getCurrentFrame():expandTemplate({title = 'italic title'}))
 	end
 end
 
 local function renderTrackingCategories()
 	if args.decat ~= 'yes' then
 		if args.child == 'yes' then
 			if args.title then
 				root:wikitext('[[Category:Pages which use embedded infobox templates with the title parameter]]')
 			end
 		elseif #(getArgNums('data')) == 0 and mw.title.getCurrentTitle().namespace == 0 then
 			root:wikitext('[[Category:Articles which use infobox templates with no data rows]]')
 		end
 	end
 end
 
 local function _infobox()
 	-- Specify the overall layout of the infobox, with special settings
 	-- if the infobox is used as a 'child' inside another infobox.
 	if args.child ~= 'yes' then
 		root = mw.html.create('table')
 
 		root
 			:addClass((args.subbox ~= 'yes') and 'infobox' or nil)
 			:addClass(args.bodyclass)
 
 			if args.subbox == 'yes' then
 				root
 					:css('padding', '0')
 					:css('border', 'none')
 					:css('margin', '-3px')
 					:css('width', 'auto')
 					:css('min-width', '100%')
 					:css('font-size', '100%')
 					:css('clear', 'none')
 					:css('float', 'none')
 					:css('background-color', 'transparent')
 			else
 				root
 					:css('width', '22em')
 			end
 		root
 			:cssText(args.bodystyle)
 
 		renderTitle()
 		renderAboveRow()
 	else
 		root = mw.html.create()
 
 		root
 			:wikitext(args.title)
 	end
 
 	renderSubheaders()
 	renderImages()
 	if args.autoheaders then
 		preprocessRows()
 	end
 	renderRows()
 	renderBelowRow()
 	renderNavBar()
 	renderItalicTitle()
 	renderTrackingCategories()
 
 	return tostring(root)
 end
 
 local function preprocessSingleArg(argName)
 	-- If the argument exists and isn't blank, add it to the argument table.
 	-- Blank arguments are treated as nil to match the behaviour of ParserFunctions.
 	if origArgs[argName] and origArgs[argName] ~= '' then
 		args[argName] = origArgs[argName]
 	end
 end
 
 local function preprocessArgs(prefixTable, step)
 	-- Assign the parameters with the given prefixes to the args table, in order, in batches
 	-- of the step size specified. This is to prevent references etc. from appearing in the
 	-- wrong order. The prefixTable should be an array containing tables, each of which has
 	-- two possible fields, a &quot;prefix&quot; string and a &quot;depend&quot; table. The function always parses
 	-- parameters containing the &quot;prefix&quot; string, but only parses parameters in the &quot;depend&quot;
 	-- table if the prefix parameter is present and non-blank.
 	if type(prefixTable) ~= 'table' then
 		error(&quot;Non-table value detected for the prefix table&quot;, 2)
 	end
 	if type(step) ~= 'number' then
 		error(&quot;Invalid step value detected&quot;, 2)
 	end
 
 	-- Get arguments without a number suffix, and check for bad input.
 	for i,v in ipairs(prefixTable) do
 		if type(v) ~= 'table' or type(v.prefix) ~= &quot;string&quot; or (v.depend and type(v.depend) ~= 'table') then
 			error('Invalid input detected to preprocessArgs prefix table', 2)
 		end
 		preprocessSingleArg(v.prefix)
 		-- Only parse the depend parameter if the prefix parameter is present and not blank.
 		if args[v.prefix] and v.depend then
 			for j, dependValue in ipairs(v.depend) do
 				if type(dependValue) ~= 'string' then
 					error('Invalid &quot;depend&quot; parameter value detected in preprocessArgs')
 				end
 				preprocessSingleArg(dependValue)
 			end
 		end
 	end
 
 	-- Get arguments with number suffixes.
 	local a = 1 -- Counter variable.
 	local moreArgumentsExist = true
 	while moreArgumentsExist == true do
 		moreArgumentsExist = false
 		for i = a, a + step - 1 do
 			for j,v in ipairs(prefixTable) do
 				local prefixArgName = v.prefix .. tostring(i)
 				if origArgs[prefixArgName] then
 					moreArgumentsExist = true -- Do another loop if any arguments are found, even blank ones.
 					preprocessSingleArg(prefixArgName)
 				end
 				-- Process the depend table if the prefix argument is present and not blank, or
 				-- we are processing &quot;prefix1&quot; and &quot;prefix&quot; is present and not blank, and
 				-- if the depend table is present.
 				if v.depend and (args[prefixArgName] or (i == 1 and args[v.prefix])) then
 					for j,dependValue in ipairs(v.depend) do
 						local dependArgName = dependValue .. tostring(i)
 						preprocessSingleArg(dependArgName)
 					end
 				end
 			end
 		end
 		a = a + step
 	end
 end
 
 local function parseDataParameters()
 	-- Parse the data parameters in the same order that the old {{infobox}} did, so that
 	-- references etc. will display in the expected places. Parameters that depend on
 	-- another parameter are only processed if that parameter is present, to avoid
 	-- phantom references appearing in article reference lists.
 	preprocessSingleArg('autoheaders')
 	preprocessSingleArg('child')
 	preprocessSingleArg('bodyclass')
 	preprocessSingleArg('subbox')
 	preprocessSingleArg('bodystyle')
 	preprocessSingleArg('title')
 	preprocessSingleArg('titleclass')
 	preprocessSingleArg('titlestyle')
 	preprocessSingleArg('above')
 	preprocessSingleArg('aboveclass')
 	preprocessSingleArg('abovestyle')
 	preprocessArgs({
 		{prefix = 'subheader', depend = {'subheaderstyle', 'subheaderrowclass'}}
 	}, 10)
 	preprocessSingleArg('subheaderstyle')
 	preprocessSingleArg('subheaderclass')
 	preprocessArgs({
 		{prefix = 'image', depend = {'caption', 'imagerowclass'}}
 	}, 10)
 	preprocessSingleArg('captionstyle')
 	preprocessSingleArg('imagestyle')
 	preprocessSingleArg('imageclass')
 	preprocessArgs({
 		{prefix = 'header'},
 		{prefix = 'data', depend = {'label'}},
 		{prefix = 'rowclass'},
 		{prefix = 'rowstyle'},
 		{prefix = 'rowcellstyle'},
 		{prefix = 'class'},
 		{prefix = 'dataid'},
 		{prefix = 'labelid'},
 		{prefix = 'headerid'},
 		{prefix = 'rowid'}
 	}, 50)
 	preprocessSingleArg('headerclass')
 	preprocessSingleArg('headerstyle')
 	preprocessSingleArg('labelstyle')
 	preprocessSingleArg('datastyle')
 	preprocessSingleArg('below')
 	preprocessSingleArg('belowclass')
 	preprocessSingleArg('belowstyle')
 	preprocessSingleArg('name')
 	args['italic title'] = origArgs['italic title'] -- different behaviour if blank or absent
 	preprocessSingleArg('decat')
 end
 
 function p.infobox(frame)
 	-- If called via #invoke, use the args passed into the invoking template.
 	-- Otherwise, for testing purposes, assume args are being passed directly in.
 	if frame == mw.getCurrentFrame() then
 		origArgs = frame:getParent().args
 	else
 		origArgs = frame
 	end
 	
 	parseDataParameters()
 	
 	return _infobox()
 end
 
 function p.infoboxTemplate(frame)
 	-- For calling via #invoke within a template
 	origArgs = {}
 	for k,v in pairs(frame.args) do origArgs[k] = mw.text.trim(v) end
 	
 	parseDataParameters()
 	
 	return _infobox()
 end