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Module:Video game release table

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require('strict')

local getArgs = require('Module:Arguments').getArgs
local p = {}

local function usedRow(args, maxLine)
	local usedRow = {}
	
	for lineNum = 1, 3 do -- rowHeader has 3 items
		local row = string.char(lineNum + 64) -- 1 => 'A', 2 => 'B'
		for line = 1, maxLine do
			if args[line .. row] then
				table.insert(usedRow, row)
				break
			end
		end
	end
	
	return usedRow
end

local function row(builder, args, usedRow, line)
	if args[line] == nil then return end
	
	local tr = builder:tag('tr')
	local th = tr:tag('th')
	th
		:wikitext(args[line])
		:attr('scope', 'row')
	
	if args[line .. 'W'] then -- 'W' for worldwide
		tr:tag('td')
			:attr('colspan', table.maxn(usedRow))
			:wikitext(args[line .. 'W'])
		return
	end
	
	for index, row in ipairs(usedRow) do
		local text = args[line .. row] or ''
		if string.lower(text) ~= 'left' then
			local colspan = 1
			for flag = index + 1, table.maxn(usedRow) do
				if string.lower(args[line .. usedRow[flag]] or '') == 'left' then
					colspan = colspan + 1
				else
					break
				end
			end
			local td = tr:tag('td')
			if string.lower(text) == 'n/a' then
				td:wikitext('N/A')
					:addClass('table-na')
					:css('background-color', '#ececec')
					:css('color', '#2C2C2C')
			else
				td:wikitext(text)
			end
			if colspan > 1 then
				td:attr('colspan', colspan)
			end
		end
	end
end

local function abbr(full_text, abbreviation)
	return string.format('<abbr title="%s">%s</abbr>', full_text, abbreviation)
end	

function p._main(args)
	-- Main module code goes here.
	local builder = mw.html.create('table')
	local maxLine = 24
	local usedRow = usedRow(args, maxLine)
	local rowHeader = {
		A = abbr('Japan', 'JP'),
		B = abbr('North America', 'NA'),
		C = abbr('Europe and/or Australasia', 'EU'),
	}

	builder
		:addClass('video-game-release-table wikitable plainrowheaders floatright')
		:css('text-align', 'center')
	local title = ''
	if args.title and args.title ~= '' then
		title = args.title
	else
		title = 'Release years by platforms'
	end
	builder:tag('caption'):wikitext(title)
	
	local tr = builder:tag('tr')

	tr:tag('th'):attr('scope', 'col'):wikitext('Platform')
	for _, row in ipairs(usedRow) do
		if args['region' .. row] then
			rowHeader[row] = args['region' .. row]
		end
		tr:tag('th'):wikitext(rowHeader[row]):attr('scope', 'col')
	end
	
	for line = 1, maxLine do
		row(builder, args, usedRow, line)
	end
	
	return builder
end

function p.main(frame)
	local args = getArgs(frame)
	return p._main(args)
end

return p