Module:ISOdate

--[[   __  __           _       _        ___ ____   ___      _       _        |  \/  | ___   __| |_   _| | ___ _|_ _/ ___| / _ \  __| | __ _| |_ ___  | |\/| |/ _ \ / _` | | | | |/ _ (_)| |\___ \| | | |/ _` |/ _` | __/ _ \ | |  | | (_) | (_| | |_| | |  __/_ | | ___) | |_| | (_| | (_| | ||  __/ |_|  |_|\___/ \__,_|\__,_|_|\___(_)___|____/ \___/ \__,_|\__,_|\__\___| This module is intended for processing of date strings.

Please do not modify this code without applying the changes first at Module:ISOdate/sandbox and testing at Module:ISOdate/sandbox/testcases and Module talk:ISOdate/sandbox/testcases.

Authors and maintainers: ]]
 * User:Parent5446 - original version of the function mimicking template:ISOdate
 * User:Jarekt - original version of the functions mimicking template:Date and template:ISOyear

-- ======================================= -- === Dependencies ====================== -- ======================================= local Date = require('Module:DateI18n')._Date

-- ======================================= -- === Local Functions =================== -- =======================================

local function parse_ISOdate(datestr) -- Core function of this module, which splits "datestr" contining date in ISO format into Year, month, day, ... components -- Output is "datevec" array with numbers representing date components. We also return "tail" storing text following the date

-- pattern: regexp - regular expresion to test; dlen - number of date elements; tail = which element is a "tail" if any -- regexp hints: -- 1) Strings starting with "^" and ending with "$" indicate whole string match	--  2) optional tail part copied as-is and following the main parsed part of the date have to be separated from the date by a whitespace, so "(\s.+)?" local patterns = { -- strings starting with YYYY-MM-DD HH:MM:SS. Year 4 digits (if we know seconds than it was within the last 100 years), the rest 1-2 -- date and time can be separated by space or "T" and there could be a "Z" on the end indicating "Zulu" time zone {dlen=6, tail=7, regexp="^+?(%d%d%d%d)-(%d%d?)-(%d%d?)[ T](%d%d?):(%d%d?):(%d%d?)Z?(%s.*)"}, {dlen=6, tail=0, regexp="^+?(%d%d%d%d)-(%d%d?)-(%d%d?)[ T](%d%d?):(%d%d?):(%d%d?)Z?$"}, -- strings starting with YYYY-MM-DD HH:MM. Year 4 digits, the rest 1-2 -- (if one knows hour and minute than it was probably after a year 1000) {dlen=5, tail=6, regexp="^+?(%d%d%d%d)-(%d%d?)-(%d%d?)[ T](%d%d?):(%d%d?)(%s.+)"}, {dlen=5, tail=0, regexp="^+?(%d%d%d%d)-(%d%d?)-(%d%d?)[ T](%d%d?):(%d%d?)$"}, -- strings starting with YYYY-MM-DD. Year 1-4 digits, the rest 1-2 {dlen=3, tail=4, regexp="^+?(%d%d?%d?%d?)-(%d%d?)-(%d%d?)(%s.+)"}, {dlen=3, tail=0, regexp="^+?(%d%d?%d?%d?)-(%d%d?)-(%d%d?)$"}, -- strings starting with YYYY-MM. Year 3-4 digits, month 2 digits -- (want to avoit converting to dates strings like 10-5 = 5		{dlen=2, tail=3, regexp="^+?(%d%d%d%d?)-(%d%d)(%s.+)"}, 		-- if whole string is in YYYY-MM form: If Year 1-4 digits, month 1-2 digits		{dlen=2, tail=0, regexp="^+?(%d%d?%d?%d?)-(%d%d?)$"}, 		-- string starts with a number -> it has to be 3 or 4 digit long to be a year		{dlen=1, tail=2, regexp="^+?(%d%d%d%d?)(%s.+)"},			 -- if whole string is a number (1-4 digit long) than it will be interpreted as a year		{dlen=1, tail=0, regexp="^+?(%d%d?%d?%d?)$"},	}	-- create datevec based on which variables are provided	local datevec = {}	local tail   = ''	for i, pat in ipairs( patterns ) do		local vec = {datestr:match( pat.regexp )}		if vec and vec[1]~=nil then			for j=1, pat.dlen do				datevec[j] = vec[j]			end			if pat.tail>0 and vec[pat.tail]~=nil then				tail = mw.ustring.gsub(' ' .. vec[pat.tail], ' +', ' ')			end			break		end	end	if not datevec[1] or datevec[1]=='' then		-- quickly return if datestr does not look like date (it could be a template)		return nil, nil	end	return datevec, tail end

-- ================================================== -- === External functions =========================== -- ================================================== local p = {}

-- =========================================================================== -- === Version of the function to be called from other LUA codes -- ===========================================================================

function p._ISOyear( datestr ) -- if empty string then return it	datestr = mw.text.trim(datestr or '' ) if datestr == '' then return '' end -- if number then return it	if tonumber( datestr ) then return mw.ustring.format( '%04i', datestr ) end -- otherwise use regular expression match datestr = mw.ustring.match( datestr, '^+?(-?%d%d?%d?%d?)-' ) if datestr and tonumber( datestr ) then return mw.ustring.format( '%04i', datestr ) else return '' end end

function p._ISOdate(datestr, lang, case, class, trim_year) datestr = mw.text.trim(datestr or '' ) local datevec, tail = parse_ISOdate(datestr) if not datevec then return datestr, false -- quickly return if datestr does not look like date (it could be a template) end

-- call p._Date function to format date string local datestr2 = Date(datevec, lang, case, class, trim_year) if datestr2~='' then return mw.text.trim( datestr2 .. tail), true else -- in case of errors return the original string return datestr, false end end

-- =========================================================================== -- === Versions of the function to be called from template namespace -- =========================================================================== --[[ ISOdate This function is the core part of the ISOdate template. Usage:

Parameters: 1: The date string lang: The language to display it in form: Language format (genitive, etc.) for some languages class: CSS class for the node

Error Handling: If the string does not look like it contain the proper ISO date than the function will return the original string. That is the preferred treatment for the template:Information (and similar templates) which calling it. ]] function p.ISOdate(frame) local args = {} for name, value in pairs( frame.args ) do 		if value ~= '' then -- nuke empty strings if type(name)=='string' then name = string.gsub( string.lower(name), ' ', '_') end args[name] = value end end

local datestr, succeded = p._ISOdate(		args[1] or '',		args.lang,                 -- language		args.case,                  -- allows to specify grammatical case for the month for languages that use them		args.class or 'dtstart',    -- allows to set the html class of the time node where the date is included. 		args.trim_year or '100-999' -- by default pad one and 2 digit years to be 4 digit long, while keeping 3 digit years as is		) return datestr end

--[[ ISOyear This function returns year part of date string. Usage:

Parameters 1: The date string Error Handling: If the string does not look like it contain the year than the function will not return anything. That is the preferred treatment for the template:Creator which is the main (only?) template calling it. ]] function p.ISOyear( frame ) return p._ISOyear( frame.args[1] ) end

return p