Module:Date table sorting

local lang = mw.language.getContentLanguage

-- 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.formats = { dmy = true, mdy = true, dm = true, md = true, my = true, m = true }

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

if args[2] or args[3] or args[4] then -- YMD parameters are specified individually. if args[1] then self.year = tonumber(args[1]) if not self.year then error(string.format( "'%s' is not a valid year", tostring(args[1]) ), 3)			end end if args[2] then if tonumber(args[2]) then self.month = tonumber(args[2]) elseif type(args[2]) == 'string' then self.month = self:parseMonthName(args[2]) end if not self.month then error(string.format( "'%s' is not a valid month", tostring(args[2]) ), 3)			end end if args[3] then self.day = tonumber(args[3]) if not self.day then error(string.format( "'%s' is not a valid day", tostring(args[3]) ), 3)			end end if args[4] then local bc = type(args[4]) == 'string' and args[4]:lower if bc == 'bc' or bc == 'bce' then if self.year and self.year > 0 then self.year = -self.year end elseif bc ~= 'ad' or bc ~= 'ce' then error(string.format( "'%s' is not a valid era code (expected 'BC', 'BCE', 'AD' or 'CE')", tostring(args[4]) ), 3)			end end elseif args[1] then -- args[1] is the entire date that we need to parse. self:parseDate(tostring(args[1])) else error('no date parameters detected', 3) end

-- Raise an error on invalid values if self.year then if self.year == 0 then error('years cannot be zero', 3) elseif math.floor(self.year) ~= self.year then error('years must be an integer', 3) 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', 3) end if self.day and (		self.day < 1		or self.day > 31		or math.floor(self.month) ~= self.month	) then error('months must be an integer between 1 and 31', 3) end

-- Whether to output abbreviated month names if args.abbr then self.abbr = args.abbr == 'on' else self.abbr = self.abbr 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) ), 3)	end

return self end

-- Find the month number for a month name, and set the abbr 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.abbr = true return month end end return nil 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 ), 5)	end

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

local function parseYear(s) if #s == 4 then return tonumber(s) end end

-- Deal with things that can have hyphens in first, as later we need to -- split the string by all non-word characters, including hyphens. self.year = parseYear(date) if self.year then return end

-- Split the string using non-word characters as boundaries. 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 ), 4)	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 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 -- This is DD Month. self.format = 'dmy' self.day = parseDayOrMonth(parts[1]) self.month = self:parseMonthName(parts[2]) if not self.day or not self.month then dateError end end elseif nParts == 3 then -- This can be any of the following formats: -- DD Month YYYY -- Month DD, YYYY -- YYYY-MM-DD 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 -- This is DD Month YYYY. self.format = 'dmy' self.month = self:parseMonthName(parts[2]) self.year = parseYear(parts[3]) if not self.month or not self.year then dateError 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 = self.year or os.date("*t").year year = year > 0 and year or -10000 - year return string.format(		"%05d-%02d-%02d-%02d%02d",		year,		self.month or 1,		self.day or 1,		0,		0	) end

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

function Dts:makeDisplay local ret = {} if self.day then if self.format == "mdy" then ret[#ret + 1] = self:getMonthName ret[#ret + 1] = ' ' ret[#ret + 1] = self.day if self.year then ret[#ret + 1] = ',' end else ret[#ret + 1] = self.day ret[#ret + 1] = ' ' ret[#ret + 1] = self:getMonthName end elseif self.month then ret[#ret + 1] = self:getMonthName end if self.year then if self.month then ret[#ret + 1] = ' ' end ret[#ret + 1] = math.abs(self.year) if self.year < 0 then ret[#ret + 1] = ' BC' end end return table.concat(ret) end

function Dts:__tostring local root = mw.html.create root :tag('span') :addClass('sortkey') :css('display', 'none') :css('speak', 'none') :wikitext(self:makeSortKey) :done :tag('span') :css('white-space', 'nowrap') :wikitext(self:makeDisplay) return tostring(root) end

-- Exports

local p = {}

function p._main(args) local dts = Dts.new(args) return tostring(dts) end

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

return p