Module:Dts

local yesno = require('Module:Yesno') local lang = mw.language.getContentLanguage local N_YEAR_DIGITS = 12 local MAX_YEAR = 10^N_YEAR_DIGITS - 1

-- Dts class

local Dts = {} Dts.__index = Dts

Dts.months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }

Dts.monthsAbbr = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }

function Dts._makeMonthSearch(t) local ret = {} for i, month in ipairs(t) do		ret[month:lower] = i	end return ret end Dts.monthSearch = Dts._makeMonthSearch(Dts.months) Dts.monthSearchAbbr = Dts._makeMonthSearch(Dts.monthsAbbr) Dts.monthSearchAbbr['sept'] = 9 -- Allow "Sept" to match September

Dts.formats = { dmy = true, mdy = true, dm = true, md = true, my = true, y = true, m = true, d = true, hide = true }

function Dts.new(args) local self = setmetatable({}, Dts)

-- Parse date parameters. -- In this step we also record whether the date was in DMY or YMD format, -- and whether the month name was abbreviated. if args[2] or args[3] or args[4] then self:parseDateParts(args[1], args[2], args[3], args[4]) elseif args[1] then self:parseDate(args[1]) end

-- Raise an error on invalid values if self.year then if self.year == 0 then error('years cannot be zero', 0) elseif self.year < -MAX_YEAR then error(string.format( 'years cannot be less than %s', lang:formatNum(-MAX_YEAR) ), 0)		elseif self.year > MAX_YEAR then error(string.format( 'years cannot be greater than %s', lang:formatNum(MAX_YEAR) ), 0)		elseif math.floor(self.year) ~= self.year then error('years must be an integer', 0) end end if self.month and (		self.month < 1		or self.month > 12		or math.floor(self.month) ~= self.month	) then error('months must be an integer between 1 and 12', 0) end if self.day and (		self.day < 1		or self.day > 31		or math.floor(self.day) ~= self.day	) then error('days must be an integer between 1 and 31', 0) end

-- Set month abbreviation behaviour, i.e. whether we are outputting -- "January" or "Jan". if args.abbr then self.isAbbreviated = args.abbr == 'on' or yesno(args.abbr) or false else self.isAbbreviated = self.isAbbreviated or false end

-- Set the format string if args.format then self.format = args.format else self.format = self.format or 'mdy' end if not Dts.formats[self.format] then error(string.format( "'%s' is not a valid format", tostring(self.format) ), 0)	end

-- Set addkey. This adds a value at the end of the sort key, allowing users -- to manually distinguish between identical dates. if args.addkey then self.addkey = tonumber(args.addkey) if not self.addkey or			self.addkey < 0 or			self.addkey > 9999 or			math.floor(self.addkey) ~= self.addkey then error("the 'addkey' parameter must be an integer between 0 and 9999", 0) end end

-- Set whether the displayed date is allowed to wrap or not. self.isWrapping = args.nowrap == 'off' or yesno(args.nowrap) == false

return self end

function Dts:hasDate return (self.year or self.month or self.day) ~= nil end

-- Find the month number for a month name, and set the isAbbreviated flag as -- appropriate. function Dts:parseMonthName(s) s = s:lower local month = Dts.monthSearch[s] if month then return month else month = Dts.monthSearchAbbr[s] if month then self.isAbbreviated = true return month end end return nil end

-- Parses separate parameters for year, month, day, and era. function Dts:parseDateParts(year, month, day, bc) if year then self.year = tonumber(year) if not self.year then error(string.format( "'%s' is not a valid year", tostring(year) ), 0)		end end if month then if tonumber(month) then self.month = tonumber(month) elseif type(month) == 'string' then self.month = self:parseMonthName(month) end if not self.month then error(string.format( "'%s' is not a valid month", tostring(month) ), 0)		end end if day then self.day = tonumber(day) if not self.day then error(string.format( "'%s' is not a valid day", tostring(day) ), 0)		end end if bc then local bcLower = type(bc) == 'string' and bc:lower if bcLower == 'bc' or bcLower == 'bce' then if self.year and self.year > 0 then self.year = -self.year end elseif bcLower ~= 'ad' and bcLower ~= 'ce' then error(string.format( "'%s' is not a valid era code (expected 'BC', 'BCE', 'AD' or 'CE')", tostring(bc) ), 0)		end end end

-- This method parses date strings. This is a poor man's alternative to -- mw.language:formatDate, but it ends up being easier for us to parse the date -- here than to use mw.language:formatDate and then try to figure out after the -- fact whether the month was abbreviated and whether we were DMY or MDY. function Dts:parseDate(date) -- Generic error message. local function dateError error(string.format( "'%s' is an invalid date", date ), 0)	end

local function parseDayOrMonth(s) if s:find('^%d%d?$') then return tonumber(s) end end

local function parseYear(s) if s:find('^%d%d%d%d?$') then return tonumber(s) end end

-- Deal with year-only dates first, as they can have hyphens in, and later -- we need to split the string by all non-word characters, including -- hyphens. Also, we don't need to restrict years to 3 or 4 digits, as on -- their own they can't be confused as a day or a month number. self.year = tonumber(date) if self.year then return end

-- Split the string using non-word characters as boundaries. date = tostring(date) local parts = mw.text.split(date, '%W+') local nParts = #parts if parts[1] ==  or parts[nParts] ==  or nParts > 3 then -- We are parsing a maximum of three elements, so raise an error if we -- have more. If the first or last elements were blank, then the start -- or end of the string was a non-word character, which we will also -- treat as an error. dateError elseif nParts < 1 then -- If we have less than one element, then something has gone horribly -- wrong. error(string.format( "an unknown error occurred while parsing the date '%s'", date ), 0)	end

if nParts == 1 then -- This can be either a month name or a year. self.month = self:parseMonthName(parts[1]) if not self.month then self.year = parseYear(parts[1]) if not self.year then dateError end end elseif nParts == 2 then -- This can be any of the following formats: -- DD Month -- Month DD		-- Month YYYY -- YYYY-MM self.month = self:parseMonthName(parts[1]) if self.month then -- This is either Month DD or Month YYYY. self.year = parseYear(parts[2]) if not self.year then -- This is Month DD. self.format = 'mdy' self.day = parseDayOrMonth(parts[2]) if not self.day then dateError end end else self.month = self:parseMonthName(parts[2]) if self.month then -- This is DD Month. self.format = 'dmy' self.day = parseDayOrMonth(parts[1]) if not self.day then dateError end else -- This is YYYY-MM. self.year = parseYear(parts[1]) self.month = parseDayOrMonth(parts[2]) if not self.year or not self.month then dateError end end end elseif nParts == 3 then -- This can be any of the following formats: -- DD Month YYYY -- Month DD, YYYY -- YYYY-MM-DD -- DD-MM-YYYY self.month = self:parseMonthName(parts[1]) if self.month then -- This is Month DD, YYYY. self.format = 'mdy' self.day = parseDayOrMonth(parts[2]) self.year = parseYear(parts[3]) if not self.day or not self.year then dateError end else self.day = parseDayOrMonth(parts[1]) if self.day then self.month = self:parseMonthName(parts[2]) if self.month then -- This is DD Month YYYY. self.format = 'dmy' self.year = parseYear(parts[3]) if not self.year then dateError end else -- This is DD-MM-YYYY. self.format = 'dmy' self.month = parseDayOrMonth(parts[2]) self.year = parseYear(parts[3]) if not self.month or not self.year then dateError end end else -- This is YYYY-MM-DD self.year = parseYear(parts[1]) self.month = parseDayOrMonth(parts[2]) self.day = parseDayOrMonth(parts[3]) if not self.year or not self.month or not self.day then dateError end end end end end

function Dts:makeSortKey local year, month, day local nYearDigits = N_YEAR_DIGITS if self:hasDate then year = self.year or os.date("*t").year if year < 0 then year = -MAX_YEAR - 1 - year nYearDigits = nYearDigits + 1 -- For the minus sign end month = self.month or 1 day = self.day or 1 else -- Blank transclusions should sort last. year = MAX_YEAR month = 99 day = 99 end return string.format(		'%0' .. nYearDigits .. 'd-%02d-%02d-%04d',		year, month, day, self.addkey or 0	) end

function Dts:getMonthName if not self.month then return '' end if self.isAbbreviated then return self.monthsAbbr[self.month] else return self.months[self.month] end end

function Dts:makeDisplay if self.format == 'hide' then return '' end local hasYear = self.year and self.format:find('y') local hasMonth = self.month and self.format:find('m') local hasDay = self.day and self.format:find('d') local isMonthFirst = self.format:find('md') local ret = {} if hasDay and hasMonth and isMonthFirst then ret[#ret + 1] = self:getMonthName ret[#ret + 1] = ' ' ret[#ret + 1] = self.day if hasYear then ret[#ret + 1] = ',' end elseif hasDay and hasMonth then ret[#ret + 1] = self.day ret[#ret + 1] = ' ' ret[#ret + 1] = self:getMonthName elseif hasDay then ret[#ret + 1] = self.day elseif hasMonth then ret[#ret + 1] = self:getMonthName end if hasYear then if hasDay or hasMonth then ret[#ret + 1] = ' ' end local displayYear = math.abs(self.year) if displayYear > 9999 then displayYear = lang:formatNum(displayYear) else displayYear = tostring(displayYear) end ret[#ret + 1] = displayYear if self.year < 0 then ret[#ret + 1] = ' BC' end end return table.concat(ret) end

function Dts:__tostring local root = mw.html.create local span = root:tag('span') :attr('data-sort-value', self:makeSortKey)

-- Display if self:hasDate and self.format ~= 'hide' then span:wikitext(self:makeDisplay) if not self.isWrapping then span:css('white-space', 'nowrap') end end

return tostring(root) end

-- Exports

local p = {}

function p._exportClasses return { Dts = Dts } end

function p._main(args) local success, ret = pcall(function 		local dts = Dts.new(args)		return tostring(dts)	end) if success then return ret else ret = string.format(			' Error in Template:Dts: %s ',			ret		) if mw.title.getCurrentTitle.namespace == 0 then -- Only categorise in the main namespace ret = ret .. ''		end return ret end end

function p.main(frame) local args = require('Module:Arguments').getArgs(frame, {		wrappers = 'Template:Dts',	}) return p._main(args) end

return p