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Module:Episode list

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local p = {}

-- This module requires the use of the following modules:
local colorContrastModule = require('Module:Color contrast')
local htmlColor = mw.loadData('Module:Color contrast/colors')
local langModule = require("Module:Lang")
local mathModule = require('Module:Math')
local tableEmptyCellModule = require('Module:Table empty cell')
local yesNoModule = require('Module:Yesno')

-- mw.html object for the generated row.
local row

-- Variable that will decide the colspan= of the Short Summary cell.
local nonNilParams = 0

-- Variable that will keep track if a TBA value was entered.
local cellValueTBA = false

-- Variable that handles the assigned tracking categories.
local trackingCategories = ""

-- List of tracking categories.
local trackingCategoryList = {
	["air_dates"] = "[[Category:Episode lists with unformatted air dates]]",
	["alt_air_dates"] = "[[Category:Episode lists with incorrectly formatted alternate air dates]]",
	["faulty_line_colors"] = "[[Category:Episode lists with faulty line colors]]",
	["non_compliant_line_colors"] = "[[Category:Episode lists with non-compliant line colors]]",
	["default_line_colors"] = "[[Category:Episode list using the default LineColor]]",
	["row_deviations"] = "[[Category:Episode lists with row deviations]]",
	["invalid_top_colors"] = "[[Category:Episode lists with invalid top colors]]",
	["tba_values"] = "[[Category:Episode lists with TBA values]]",
	["nonmatching_numbered_parameters"] = "[[Category:Episode lists with a non-matching set of numbered parameters]]",
	["raw_unformatted_storyteleplay"] = "[[Category:Episode lists with unformatted story or teleplay credits]]",
}

-- List of parameter names in this order.
local cellNameList = {
	'EpisodeNumber',
	'EpisodeNumber2',
	'Title',
	'Aux1',
	'DirectedBy',
	'WrittenBy',
	'Aux2',
	'Aux3',
	'OriginalAirDate',
	'AltDate',
	'Guests',
	'MusicalGuests',
	'ProdCode',
	'Viewers',
	'Aux4'
}

-- List of pairs which cannot be used together
local excludeList = {
	['Guests'] = 'Aux1',
	['MusicalGuests'] = 'Aux2'
}

-- List of cells that have parameter groups
local parameterGroupCells = {}
local firstParameterGroupCell
local parameterGroupCellsAny = false

-- List of title parameter names in this order.
-- List used for multi title lists.
local titleList = {
	'Title',
	'RTitle',
	'AltTitle',
	'RAltTitle',
	'NativeTitle',
	'TranslitTitle',
}

-- Local function which is used to retrieve the episode number or production code number,
-- without any additional text.
local function idTrim(val, search)
	local valFind = string.find(val, search)

	if (valFind == nil) then
		return val
	else
		return string.sub(val, 0, valFind-1)
	end
end

-- Local function which is used to validate that a parameter has an actual value.
local function hasValue(param)
	if (param ~= nil and param ~= "") then
		return true
	else
		return false
	end
end

-- Local function which is used to create a table data cell.
local function createTableData(text, rowSpan, textAlign)
	if (rowSpan ~= nil and tonumber(rowSpan) > 1) then
		row:tag('td')
			:attr('rowspan', rowSpan)
			:wikitext(text)
	else
		row:tag('td')
			:css('text-align', textAlign)
			:wikitext(text)
	end
end

-- Local function which is used to add a tracking category to the page.
local function addTrackingCategory(category)
	trackingCategories = trackingCategories .. category
end

-- Local function which is used to create a Short Summary row.
local function createShortSummaryRow(args, lineColor)
	-- fix for lists in the Short Summary
	local shortSummaryText = args.ShortSummary

	if (shortSummaryText:match('^[*:;#]') or shortSummaryText:match('^{|')) then
		shortSummaryText = '<span></span>\n' .. shortSummaryText
	end

	if (shortSummaryText:match('\n[*:;#]')) then
		shortSummaryText = shortSummaryText .. '\n<span></span>'
	end
	
	local shortSummaryDiv = mw.html.create('div')
				:addClass('shortSummaryText')
				:css('max-width', '90vw')
				:css('position', 'sticky')
				:css('left', '0.2em')
				:newline()
				:wikitext(shortSummaryText)

	local shortSummaryCell = mw.html.create('td')
				:addClass('description')
				:css('border-bottom', 'solid 3px ' .. lineColor)
				:attr('colspan', nonNilParams)
				:newline()
				:node(shortSummaryDiv)

	return mw.html.create('tr')
					:addClass('expand-child')
					:node(shortSummaryCell)
end


-- Local function which is used to add tracking categories for Top Color issues.
local function addTopColorTrackingCategories(args)
	if (hasValue(args.TopColor)) then
		addTrackingCategory(trackingCategoryList["row_deviations"])

		-- Track top colors that have a color contrast rating below AAA with
		-- respect to text color, link color, or visited link color. See
		-- [[WP:COLOR]] for more about color contrast requirements.
		local textContrastRatio = colorContrastModule._ratio{args.TopColor, 'black', ['error'] = 0}
		local linkContrastRatio = colorContrastModule._ratio{args.TopColor, '#0B0080', ['error'] = 0}
		local visitedLinkContrastRatio = colorContrastModule._ratio{args.TopColor, '#0645AD', ['error'] = 0}

		if (textContrastRatio < 7 or linkContrastRatio < 7 or visitedLinkContrastRatio < 7) then
			addTrackingCategory(trackingCategoryList["invalid_top_colors"])
		end
	end
end

-- Local function which is used to add tracking categories for Line Color issues.
local function addLineColorTrackingCategories(args)
	if (hasValue(args.LineColor)) then
		local blackContrastRatio = colorContrastModule._ratio{args.LineColor, 'black', ['error'] = 0}
		local whiteContrastRatio = colorContrastModule._ratio{'white', args.LineColor, ['error'] = 0}

		if (colorContrastModule._lum(args.LineColor) == '') then
			addTrackingCategory(trackingCategoryList["faulty_line_colors"])
		elseif (blackContrastRatio < 7 and whiteContrastRatio < 7) then
			addTrackingCategory(trackingCategoryList["non_compliant_line_colors"])
		end
	else
		addTrackingCategory(trackingCategoryList["default_line_colors"])
	end
end

-- Local function which is used to set the text of an empty cell
-- with either "TBD" or "N/A".
-- Set to N/A if viewers haven't been available for four weeks, else set it as TBD.
local function setTBDStatus(args, awaitingText, expiredText, weeks)
	if args.OriginalAirDate == nil or args.OriginalAirDate == '' then
		return tableEmptyCellModule._main({alt_text = awaitingText, title_text = awaitingText})
	end
	
	local month, day, year = args.OriginalAirDate:gsub("&nbsp;", " "):match("(%a+) (%d+), (%d+)")

	if (month == nil) then
		day, month, year = args.OriginalAirDate:gsub("&nbsp;", " "):match("(%d+) (%a+) (%d+)")
	end

	if (day == nil) then
		return tableEmptyCellModule._main({alt_text = "TBD"})
	else
		-- List of months.
		local monthList = {
			['January'] = 1,
			['February'] = 2,
			['March'] = 3,
			['April'] = 4,
			['May'] = 5,
			['June'] = 6,
			['July'] = 7,
			['August'] = 8,
			['September'] = 9,
			['October'] = 10,
			['November'] = 11,
			['December'] = 12
		}
		
		if not monthList[month] then
			error('Invalid month ' .. month)
		end

		local seconds = os.time() - os.time({year = year, month = monthList[month], day = day, hour = 0, min = 0, sec = 0})

		if (seconds >= 60 * 60 * 24 * 7 * weeks) then
			return tableEmptyCellModule._main({alt_text = expiredText, title_text = expiredText})
		else
			return tableEmptyCellModule._main({alt_text = awaitingText, title_text = awaitingText})
		end
	end
end

-- Local function which is used to create an empty cell.
local function createEmptyCell(args, v, unsetParameterGroup)
	if (unsetParameterGroup) then
		args[v] = tableEmptyCellModule._main({alt_text = "N/A"})
	elseif (v == 'Viewers' and hasValue(args.OriginalAirDate)) then
		args[v] = setTBDStatus(args, "TBD", "N/A", 4)
	elseif (v == 'DirectedBy' or v == 'WrittenBy') then
		args[v] = setTBDStatus(args, "TBA", "Unknown", 4)
	else
		args[v] = tableEmptyCellModule._main({})
	end
end

-- Air dates that don't use {{Start date}}
local function checkUsageOfDateTemplates(args, v, onInitialPage, title)
	if (v == 'OriginalAirDate'
		and args[v] ~= ''
		and string.match(args[v], '%d%d%d%d') ~= nil
		and string.match(args[v], '2C2C2C') == nil
		and string.find(args[v], 'itvstart') == nil -- itvstart is a {{Start date}} unique class.
		--and string.find(args[v], "film%-date") ~= nil -- Checks that {{Film date}} isn't used as it uses {{Start date}}.
		and onInitialPage
		and title.namespace == 0)
	then
		addTrackingCategory(trackingCategoryList["air_dates"])
	end

	-- Alternate air dates that do use {{Start date}}
	if (v == 'AltDate' and args[v] ~= '' and string.find(args[v], 'dtstart') ~= nil and onInitialPage and title.namespace == 0) then
		addTrackingCategory(trackingCategoryList["alt_air_dates"])
	end
end

-- Local function which is used to create a Production Code cell.
local function createProductionCodeCell(args, v, numberOfParameterGroups)
	local thisRowspan
	if (not parameterGroupCells[v] and parameterGroupCellsAny) then
		thisRowspan = numberOfParameterGroups
	else
		thisRowspan = 1
	end
	
	if (hasValue(args.ProdCode) and string.find(args.ProdCode, 'TBA') == nil) then
		row:tag('td')
			:attr('id', 'pc' .. idTrim(idTrim(args.ProdCode, ' ----'), '<'))
			:attr('rowspan', thisRowspan)
			:css('text-align', 'center')
			:wikitext(args.ProdCode)
	elseif (args.ProdCode == '' or string.find(args.ProdCode or '', 'TBA') ~= nil) then
		createEmptyCell(args, v, false)
		createTableData(args.ProdCode, thisRowspan, "center")
	else
		-- ProductionCode parameter not used; Do nothing.
	end

	nonNilParams = nonNilParams + 1
end

--[[
Local function which is used to extract data
from the numbered serial parameters (Title1, Aux1, etc.), and then convert them to
use the non-numbered parameter names (Title, Aux).

The function returns the args as non-numbered prameter names.
]]--
local function extractDataFromNumberedSerialArgs(args, i, numberOfParameterGroups, title)
	for _, v in ipairs(cellNameList) do
		local parameter = v
		local numberedParameter = v .. "_" .. i
		local excludeParameter = excludeList[parameter] or 'NULL' .. parameter
		local excludeNumberParameter = (excludeList[numberedParameter] or 'NULL' .. parameter) .. "_" .. i
		if (not hasValue(args[numberedParameter]) and not hasValue(args[excludeNumberParameter])
			and hasValue(parameterGroupCells[parameter]) and not hasValue(args[excludeParameter])) then
			if (v ~= 'ProdCode') then
				createEmptyCell(args, parameter, true)
			else
				args[parameter] = ''
			end
			if (title.namespace == 0) then
				addTrackingCategory(trackingCategoryList["nonmatching_numbered_parameters"])
			end
		elseif (hasValue(args[numberedParameter]) and not  hasValue(args[excludeNumberParameter])) then
			args[parameter] = args[numberedParameter]
		end
	end

	return args
end

--[[
Local function which is used to create the Title cell text.

The title text will be handled in the following way:
	Line 1: <Title><RTitle> (with no space between)
	Line 2: <AltTitle><RAltTitle> (with no space between) OR
	Line 2: Transliteration: <TranslitTitle> (<Language>: <NativeTitle>)<RAltTitle> (with space between first two parameters)

	If <Title> or <RTitle> are empty,
	then the values of line 2 will be placed on line 1 instead.

--]]
local function createTitleText(args)
	local titleString = ''
	local isCellPresent = false
	local useSecondLine = false
	local lineBreakUsed = false

	-- Surround the Title with quotes; No quotes if empty.
	if (args.Title ~= nil) then
		if (args.Title == "") then
			isCellPresent = true
		else
			titleString = '"' .. args.Title .. '"'
			useSecondLine = true
			isCellPresent = true
		end
	end

	if (args.RTitle ~= nil) then
		if (args.RTitle == "") then
			isCellPresent = true
		else
			titleString = titleString .. args.RTitle
			useSecondLine = true
			isCellPresent = true
		end
	end

	-- Surround the AltTitle/TranslitTitle with quotes; No quotes if empty.
	if (args.AltTitle or args.TranslitTitle) then

		isCellPresent = true

		if (useSecondLine) then
			titleString = titleString .. "<br />"
			lineBreakUsed = true
		end

		if (hasValue(args.AltTitle)) then
			titleString = titleString .. '"' .. args.AltTitle .. '"'
		elseif (hasValue(args.TranslitTitle)) then
			if (hasValue(args.NativeTitleLangCode)) then
				titleString = titleString .. 'Transliteration: "' .. langModule._transl({args.NativeTitleLangCode, args.TranslitTitle, italic = 'no'})  .. '"'
			else
				titleString = titleString .. 'Transliteration: "' .. args.TranslitTitle .. '"'
			end
		end
	end

	if (args.NativeTitle ~= nil) then
		if (args.NativeTitle == "") then
			isCellPresent = true
		else
			isCellPresent = true

			if (useSecondLine and lineBreakUsed == false) then
				titleString = titleString .. "<br />"
			end

			if (hasValue(args.NativeTitleLangCode)) then
				local languageCode = "Lang-" .. args.NativeTitleLangCode
				titleString = titleString .. " (" .. langModule._lang_xx_inherit({code = args.NativeTitleLangCode, args.NativeTitle}) .. ")"
			else
				titleString = titleString .. " (" .. args.NativeTitle .. ")"
			end
		end
	end

	if (args.RAltTitle ~= nil) then
		if (args.RAltTitle == "") then
			isCellPresent = true
		else
			isCellPresent = true

			if (useSecondLine and lineBreakUsed == false) then
				titleString = titleString .. "<br />"
			end

			titleString = titleString .. args.RAltTitle
		end
	end

	return titleString, isCellPresent
end

--[[
Local function which is used to extract data
from the numbered title parameters (Title1, RTitle2, etc.), and then convert them to
use the non-numbered prameter names (Title, RTitle).

The function returns two results:
	-- The args parameter table.
	-- A boolean indicating if the title group has data.
]]--
local function extractDataFromNumberedTitleArgs(args, i)
	local nextGroupValid = false

	for _, v in ipairs(titleList) do
		local parameter = v
		local numberedParameter = v .. "_" .. i
		args[parameter] = args[numberedParameter]

		if (nextGroupValid == false and hasValue(args[numberedParameter])) then
			nextGroupValid = true
		end
	end

	return args, nextGroupValid
end

-- Local function which is used to create a Title cell.
local function createTitleCell(args, numberOfParameterGroups, currentRow, isSerial)
	local titleText
	local isCellPresent
	
	if (isSerial and args.Title and currentRow > 1) then
		return nil
	end
	if (args.Title_2) then
		local args, nextGroupValid = extractDataFromNumberedTitleArgs(args, currentRow)
	end
	titleText, isCellPresent = createTitleText(args)

	if (isCellPresent == false) then
		return nil
	end

	local textAlign = "left"

	-- If Title is blank, then set Raw Title to TBA
	if (hasValue(titleText) == false) then
		titleText = tableEmptyCellModule._main({})
		textAlign = "left"
	end

	-- If title is the first cell, create it with a !scope="row"
	if (nonNilParams == 0) then
		if (isSerial) then
			row:tag('th')
				:addClass('summary')
				:attr('scope', 'row')
				:attr('rowspan', numberOfParameterGroups)
				:css('text-align', textAlign)
				:wikitext(titleText)
		else
			row:tag('th')
				:addClass('summary')
				:attr('scope', 'row')
				:css('text-align', textAlign)
				:wikitext(titleText)
		end
	else
		if (isSerial) then
			row:tag('td')
				:addClass('summary')
				:attr('rowspan', numberOfParameterGroups)
				:css('text-align', textAlign)
				:wikitext(titleText)
		else
			row:tag('td')
				:addClass('summary')
				:css('text-align', textAlign)
				:wikitext(titleText)
		end
	end

	nonNilParams = nonNilParams + 1
end

--[[
Local function which is used to create column cells.

EpisodeNumber, EpisodeNumber2 are created in different functions
as they require some various if checks.

See:
	-- createEpisodeNumberCell()
	-- createEpisodeNumberCellSecondary()
]]--
local function createCells(args, isSerial, currentRow, onInitialPage, title, numberOfParameterGroups)
	for k, v in ipairs(cellNameList) do
		if (v == 'ProdCode') then
			if (currentRow == 1 or (currentRow > 1 and parameterGroupCells[v])) then
				createProductionCodeCell(args, v, numberOfParameterGroups)
			end
		elseif (v == 'Title') then
			if (currentRow == 1 or (currentRow > 1 and parameterGroupCells[v])) then
				local isSerial = not args.Title_2 and true or false
				createTitleCell(args, numberOfParameterGroups, currentRow, isSerial)
			end
		elseif excludeList[v] and args[excludeList[v]] then
			-- Ignore this parameter set as multiple conflicting parameters were used
		elseif (args[v] and (v ~= 'EpisodeNumber' and v ~= 'EpisodeNumber2')) then
			-- Set empty cells to TBA/TBD
			if (args[v] == '') then
				createEmptyCell(args, v, false)
			elseif (v == 'WrittenBy' and title.namespace == 0) then
				if ((string.find(args[v], "''Story") ~= nil or string.find(args[v], "''Teleplay") ~= nil) and string.find(args[v], "8202") == nil) then
					-- &#8202; is the hairspace added through {{StoryTeleplay}}
					addTrackingCategory(trackingCategoryList["raw_unformatted_storyteleplay"])
				end
			end

			-- If serial titles need to be centered and not left, then this should be removed.
			local textAlign = "center"
			if (v == 'Aux1' and isSerial) then
				textAlign = "left"
			end

			local thisRowspan
			if (not parameterGroupCells[v] and parameterGroupCellsAny) then
				thisRowspan = numberOfParameterGroups
			else
				thisRowspan = 1
			end

			if (currentRow == 1 or (currentRow > 1 and parameterGroupCells[v])) then
				createTableData(args[v], thisRowspan, textAlign)
			end
			nonNilParams = nonNilParams + 1
			checkUsageOfDateTemplates(args, v, onInitialPage, title)
		end

		if (args[v] == "TBA") then
			cellValueTBA = true
		end
	end
end

-- Local function which is used to create a table row header for either the
-- EpisodeNumber or EpisodeNumber2 column cells.
local function createTableRowEpisodeNumberHeader(episodeNumber, numberOfParameterGroups, episodeText, separateEpisodeNumbers)
		local epID = string.match(episodeNumber, "^%w+")
		row:tag('th')
			:attr('scope', 'row')
			:attr('rowspan', not separateEpisodeNumbers and numberOfParameterGroups or 1)
			:attr('id', epID and 'ep' .. epID or '')
			:css('text-align', 'center')
			:wikitext(episodeText)
end

--[[
Local function which is used to extract the text from the EpisodeNumber or EpisodeNumber2
parameters and format them into a correct MoS compliant version.

Styles supported:
	-- A number range of two numbers, indicating the start and end of the range,
	seperated by an en-dash (–) with no spaces in between.
		Example: "1 - 2" -> "1–2"; "1-2-3" -> "1–3".
	-- An alphanumeric or letter range, similar to the above.
		Example: "A - B" -> "A–B"; "A-B-C" -> "A–C".
		Example: "A1 - B1" -> "A1–B1"; "A1-B1-C1" -> "A1–C1".
	-- A number range of two numbers, indicating the start and end of the range,
	seperated by a visual <hr /> (divider line).
	-- An alphanumeric or letter range, similar to the above.
]]--
local function getEpisodeText(episodeNumber)
	if (episodeNumber == '') then
		return tableEmptyCellModule._main({})
	else

		local episodeNumber1
		local episodeNumber2

		-- Used for double episodes that need a visual "–"" or "<hr />"" added.
		local divider

		episodeNumber = episodeNumber:gsub('%s*<br%s*/?%s*>%s*', '<hr />')

		if (episodeNumber:match('^(%w+)%s*<hr */%s*>%s*(%w+)$')) then
			episodeNumber1, episodeNumber2 = episodeNumber:match('^(%w+)%s*<hr */%s*>%s*(%w+)$')
			divider = "<hr />"
		elseif (episodeNumber:match('^(%w+)%s*<hr */%s*>.-<hr */%s*>%s*(%w+)$')) then  -- 3 or more elements
			episodeNumber1, episodeNumber2 = episodeNumber:match('^(%w+)%s*<hr */%s*>.-<hr */%s*>%s*(%w+)$')
			divider = "<hr />"
		elseif (mw.ustring.match(episodeNumber, '^(%w+)%s*[%s%-–/&]%s*(%w+)$')) then
			episodeNumber1, episodeNumber2 = mw.ustring.match(episodeNumber, '^(%w+)%s*[%s%-–/&]%s*(%w+)$')
			divider = "–"
		else
			episodeNumber1, episodeNumber2 = mw.ustring.match(episodeNumber, '^(%w+)%s*[%s%-–/&].-[%s%-–/&]%s*(%w+)$')  -- 3 or more elements
			divider = "–"
		end

		if (not episodeNumber1) then
			return episodeNumber
		elseif (not episodeNumber2) then
			return string.match(episodeNumber, '%w+')
		else
			return episodeNumber1 .. divider .. episodeNumber2
		end
	end
end

-- Local function which is used to create EpisodeNumber2 and EpisodeNumber3 cells.
local function _createEpisodeNumberCellSecondary(episodeValue, numberOfParameterGroups, separateEpisodeNumbers)
	if (episodeValue) then
		local episodeText = getEpisodeText(episodeValue)

		if (nonNilParams == 0) then
			createTableRowEpisodeNumberHeader(episodeValue, numberOfParameterGroups, episodeText, separateEpisodeNumbers)
		else
			createTableData(episodeText, not separateEpisodeNumbers and numberOfParameterGroups or 1, "center")
		end

		nonNilParams = nonNilParams + 1

	end
end

-- Local function which is used to create seconday episode number cells.
local function createEpisodeNumberCellSecondary(args, numberOfParameterGroups, separateEpisodeNumbers)
	_createEpisodeNumberCellSecondary(args.EpisodeNumber2, numberOfParameterGroups, separateEpisodeNumbers)
	_createEpisodeNumberCellSecondary(args.EpisodeNumber3, numberOfParameterGroups, separateEpisodeNumbers)
end

-- Local function which is used to create an EpisodeNumber cell.
local function createEpisodeNumberCell(args, numberOfParameterGroups, separateEpisodeNumbers)
	if (args.EpisodeNumber) then
		local episodeText = getEpisodeText(args.EpisodeNumber)
		createTableRowEpisodeNumberHeader(args.EpisodeNumber, numberOfParameterGroups, episodeText, separateEpisodeNumbers)
		nonNilParams = nonNilParams + 1
	end
end

-- Local function which is used to create a single row of cells.
-- This is the standard function called.
local function createSingleRowCells(args, numberOfParameterGroups, multiTitleListEnabled, onInitialPage, title)
	createEpisodeNumberCell(args, 1, false)
	createEpisodeNumberCellSecondary(args, 1, false)
	createCells(args, false, 1, onInitialPage, title, numberOfParameterGroups)
end

-- Local function which is used to create a multiple row of cells.
-- This function is called when part of the row is rowspaned.
local function createMultiRowCells(args, numberOfParameterGroups, onInitialPage, title, topColor)
	local EpisodeNumberSplit = (args.EpisodeNumber_1 and true or false)
	
	for i = 1, numberOfParameterGroups do
		args = extractDataFromNumberedSerialArgs(args, i, numberOfParameterGroups, title)
		
		if (EpisodeNumberSplit or (not EpisodeNumberSplit and i == 1)) then
			createEpisodeNumberCell(args, numberOfParameterGroups, EpisodeNumberSplit)
			createEpisodeNumberCellSecondary(args, numberOfParameterGroups, EpisodeNumberSplit)
		end
		
		createCells(args, true, i, onInitialPage, title, numberOfParameterGroups)
		if (i ~= numberOfParameterGroups) then
			row = row:done()  -- Use done() to close the 'tr' tag in rowspaned rows.
				:tag('tr')
				:css('background', topColor)
		end
	end
end

-- Local function which is used to retrieve the NumParts value.
local function getnumberOfParameterGroups(args)
	for k, v in ipairs(cellNameList) do
		local numberedParameter = v .. "_" .. 1
		if (args[numberedParameter]) then
			parameterGroupCells[v] = true
			parameterGroupCellsAny = true
			if not firstParameterGroupCell then
				firstParameterGroupCell = k
			end
		end
	end

	if (hasValue(args.NumParts)) then
		return args.NumParts, true
	else
		return 1, false
	end
end

-- Local function which is used to retrieve the Top Color value.
local function getTopColor(args, rowColorEnabled, onInitialPage)
	local episodeNumber = mathModule._cleanNumber(args.EpisodeNumber) or 1
	if (args.TopColor) then
		if (string.find(args.TopColor, "#")) then
			return args.TopColor
		else
			return '#' .. args.TopColor
		end
	elseif (rowColorEnabled and onInitialPage and mathModule._mod(episodeNumber, 2) == 0) then
		return '#E9E9E9'
	elseif (onInitialPage and args.ShortSummary) then
		return '#F2F2F2'
	else
		return 'inherit'
	end
end

-- Local function which is used to retrieve the Row Color value.
local function isRowColorEnabled(args)
	local rowColorEnabled = yesNoModule(args.RowColor, false)

	if (args.RowColor and string.lower(args.RowColor) == 'on') then
		rowColorEnabled = true
	end

	return rowColorEnabled
end

-- Local function which is used to retrieve the Line Color value.
local function getLineColor(args)
	-- Default color to light blue
	local lineColor = args.LineColor or 'CCCCFF'

	-- Add # to color if necessary, and set to default color if invalid
	if (htmlColor[lineColor] == nil) then
		lineColor = '#' .. (mw.ustring.match(lineColor, '^[%s#]*([a-fA-F0-9]*)[%s]*$') or '')
		if (lineColor == '#') then
			lineColor = '#CCCCFF'
		end
	end

	return lineColor
end

-- Local function which is used to check if the table is located on the page
-- currently viewed, or on a transcluded page instead.
-- If it is on a transcluded page, the episode summary should not be shown.
local function isOnInitialPage(args, sublist, pageTitle, initiallistTitle)
	-- This should be the only check needed, however, it was previously implemented with two templates
	-- with one of them not requiring an article name, so for backward compatability, the whole sequence is kept.
	local onInitialPage

	-- Only sublist had anything about hiding, so only it needs to even check
	if (sublist) then
		onInitialPage = mw.uri.anchorEncode(pageTitle) == mw.uri.anchorEncode(initiallistTitle)
		-- avoid processing ghost references
		if (not onInitialPage) then
			args.ShortSummary = nil
		end
	else
		if (initiallistTitle == "") then
			onInitialPage = true
		else
			onInitialPage = mw.uri.anchorEncode(pageTitle) == mw.uri.anchorEncode(initiallistTitle)
		end
	end

	return onInitialPage
end

-- Local function which does the actual main process.
local function _main(args, sublist)
	local title = mw.title.getCurrentTitle()
	local pageTitle = title.text
	local initiallistTitle = args['1'] or ''

	-- Is this list on the same page as the page directly calling the template?
	local onInitialPage = isOnInitialPage(args, sublist, pageTitle, initiallistTitle)

	-- Need just this parameter removed if blank, no others
	if (hasValue(args.ShortSummary) == false) then
		args.ShortSummary = nil
	end

	local lineColor = getLineColor(args)
	local rowColorEnabled = isRowColorEnabled(args)
	local topColor = getTopColor(args, rowColorEnabled, onInitialPage)

	local root = mw.html.create()							-- Create the root mw.html object to return
	local textColor = '#333'
	if topColor == 'inherit' then
		textColor = 'inherit'
	end

	row = root:tag('tr')									-- Create the table row and store it globally
				:addClass('vevent')
				:addClass('module-episode-list-row')
				:css('text-align', 'center')
				:css('background', topColor)
				:css('color', textColor)

	local numberOfParameterGroups, multiTitleListEnabled = getnumberOfParameterGroups(args)

	if (multiTitleListEnabled) then
		createMultiRowCells(args, numberOfParameterGroups, onInitialPage, title, topColor)
	else
		createSingleRowCells(args, numberOfParameterGroups, multiTitleListEnabled, onInitialPage, title)
	end

	-- add these categories only in the mainspace and only if they are on the page where the template is used
	if (onInitialPage and title.namespace == 0) then
		addLineColorTrackingCategories(args)
		addTopColorTrackingCategories(args)
	end

	if (cellValueTBA == true and title.namespace == 0) then
		addTrackingCategory(trackingCategoryList["tba_values"])
	end

	-- Do not show the summary if this is being transcluded on the initial list page
	-- Do include it on all other lists
	if (onInitialPage and args.ShortSummary) then
		local bottomWrapper = createShortSummaryRow(args, lineColor)
		return tostring(root) .. tostring(bottomWrapper) .. trackingCategories
	else
		return tostring(root) .. trackingCategories
	end
end

-- Local function which handles both module entry points.
local function main(frame, sublist)
	local getArgs = require('Module:Arguments').getArgs
	local args

	-- Most parameters should still display when blank, so don't remove blanks
	if (sublist) then
		args = getArgs(frame, {removeBlanks = false, wrappers = 'Template:Episode list/sublist'})
	else
		args = getArgs(frame, {removeBlanks = false, wrappers = 'Template:Episode list'})
	end

	-- args['1'] = mw.getCurrentFrame():getParent():getTitle()
	return _main(args, sublist, frame)
end

--[[
Public function which is used to create an Episode row
for an Episode Table used for lists of episodes where each table is on a different page,
usually placed on individual season articles.

For tables which are all on the same page see p.list().

Parameters:
	-- |1=					— required; The title of the article where the Episode Table is located at.
	-- |EpisodeNumber=		— suggested; The overall episode number in the series.
	-- |EpisodeNumber2=		— suggested; The episode number in the season.
	-- |Title=				— suggested; The English title of the episode.
	-- |RTitle=				— optional; Unformatted parameter that can be used to add a reference after "Title",
											or can be used as a "raw title" to replace "Title" completely.
	-- |AltTitle=			— optional; An alternative title, such as the title of a foreign show's episode in its native language,
											or a title that was originally changed.
	-- |TranslitTitle=		— optional; The title of the episode transliteration (Romanization) to Latin characters.
	-- |RAltTitle=			— optional; Unformatted parameter that can be used to add a reference after "AltTitle",
											or can be used as a "raw title" to replace "AltTitle" completely.
	-- |NativeTitle=		— optional; The title of the episode in the native language.
	-- |NativeTitleLangCode — optional; The language code of the native title language.
	-- |Aux1=				— optional; General purpose parameter. The meaning is specified by the column header.
										This parameter is also used for Serial episode titles, such as those used in Doctor Who.
	-- |DirectedBy=			— optional; Name of the episode's director. May contain links.
	-- |WrittenBy=			— optional; Primary writer(s) of the episode. May include links.
	-- |Aux2=				— optional; General purpose parameter. The meaning is specified by the column header.
	-- |Aux3=				— optional; General purpose parameter. The meaning is specified by the column header.
	-- |OriginalAirDate=	— optional; This is the date the episode first aired on TV, or is scheduled to air.
	-- |AltDate=			— optional; The next notable air date, such as the first air date of an anime in English.
	-- |Guests=             — optional; List of Guests for talk shows.  Cannot be used simultaneously with Aux1.
	-- |MusicalGuests=      — optional; List of MusicalGuests for talk shows.  Cannot be used simultaneously with Aux2. 
	-- |ProdCode=			— optional; The production code in the series. When defined, this parameter also creates a link anchor,
											prefixed by "pc"; for example, List of episodes#pc01.
	-- |Viewers=			— optional; Number of viewers who watched the episode. Should include a reference.
	-- |Aux4=				— optional; General purpose parameter. The meaning is specified by the column header.
	-- |ShortSummary=		— optional; A short 100–200 word plot summary of the episode.
	-- |LineColor=			— optional; Colors the separator line between episode entries. If not defined the color defaults to "#CCCCFF"
											and the article is placed in Category:Episode list using the default LineColor.
											Use of "#", or anything but a valid hex code will result in an invalid syntax.
	-- |TopColor=			— discouraged; Colors the main row of information (that is, not the ShortSummary row).
											Articles using this parameter are placed in Category:Episode lists with row deviations.
	-- |RowColor=			— optional; Switch parameter that must only be defined when the EpisodeNumber= entry is not a regular number
											(e.g. "12–13" for two episodes described in one table entry).
											If the first episode number is even, define pass "on". If the first episode number is odd, pass "off".
--]]
function p.sublist(frame)
	return main(frame, true)
end

--[[
Public function which is used to create an Episode row
for an Episode Table used for lists of episodes where all tables are on the same page.

For tables which are on different pages see p.sublist().

For complete parameter documentation, see the documentation at p.sublist().
--]]
function p.list(frame)
	return main(frame, false)
end

return p
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