Module:Age

-- Implement various "age of" and other date-related templates.

local _Date, _current_date local function get_exports(frame) -- Return objects exported from the date module or its sandbox. if not _Date then local sandbox = frame:getTitle:find('sandbox', 1, true) and '/sandbox' or '' local datemod = require('Module:Date' .. sandbox) _Date = datemod._Date _current_date = datemod._current end return _Date, _current_date end

local function collection -- Return a table to hold items. return { n = 0, add = function (self, item) self.n = self.n + 1 self[self.n] = item end, join = function (self, sep) return table.concat(self, sep) end, } end

local function strip_to_nil(text) -- If text is a string, return its trimmed content, or nil if empty. -- Otherwise return text (which may, for example, be nil). if type(text) == 'string' then text = text:match('(%S.-)%s*$') end return text end

local function yes(parameter) -- Return true if parameter should be interpreted as "yes". -- Do not want to accept mixed upper/lowercase unless done by current templates. -- Need to accept "on" because "round=on" is wanted. return ({ y = true, yes = true, on = true })[parameter] end

local function message(msg, nocat) -- Return formatted message text for an error. -- Can append "#FormattingError" to URL of a page with a problem to find it. local anchor = ' ' local category if not nocat and mw.title.getCurrentTitle:inNamespaces(0, 10) then -- Category only in namespaces: 0=article, 10=template. category = '' else category = '' end return anchor .. ' Error: ' .. mw.text.nowiki(msg) .. ' ' ..		category end

local function formatnumber(number) -- Return the given number formatted with commas as group separators, -- given that the number is an integer. local numstr = tostring(number) local length = #numstr local places = collection local pos = 0 repeat places:add(pos) pos = pos + 3 until pos >= length places:add(length) local groups = collection for i = places.n, 2, -1 do		local p1 = length - places[i] + 1 local p2 = length - places[i - 1] groups:add(numstr:sub(p1, p2)) end return groups:join(',') end

local function make_sort(value, sortable) -- Return a sort key in a span if specified. -- Assume value is a valid number which has not overflowed. if sortable == 'sortable_on' or sortable == 'sortable_debug' then local sortkey if value == 0 then sortkey = '5000000000000000000' else local mag = math.floor(math.log10(math.abs(value)) + 1e-14) local prefix if value > 0 then prefix = 7000 + mag else prefix = 2999 - mag value = value + 10^(mag+1) end sortkey = string.format('%d', prefix) .. string.format('%015.0f', math.floor(value * 10^(14-mag))) end local lhs = sortable == 'sortable_debug' and ' ' or			' ' return lhs .. sortkey .. '♠ '	end end

local translate_parameters = { abbr = { off = 'abbr_off', on = 'abbr_on', },	disp = { age = 'disp_age', raw = 'disp_raw', },	format = { raw = 'format_raw', commas = 'format_commas', },	round = { on = 'on', yes = 'on', months = 'ym', weeks = 'ymw', days = 'ymd', hours = 'ymdh', },	sep = { comma = 'sep_comma', [','] = 'sep_comma', serialcomma = 'sep_serialcomma', space = 'sep_space', },	show = { hide = { id = 'hide' }, y = { 'y', id = 'y' }, ym = { 'y', 'm', id = 'ym' }, ymd = { 'y', 'm', 'd', id = 'ymd' }, ymw = { 'y', 'm', 'w', id = 'ymw' }, ymwd = { 'y', 'm', 'w', 'd', id = 'ymwd' }, yd = { 'y', 'd', id = 'yd', keepzero = true }, m = { 'm', id = 'm' }, md = { 'm', 'd', id = 'md' }, w = { 'w', id = 'w' }, wd = { 'w', 'd', id = 'wd' }, d = { 'd', id = 'd' }, dh = { 'd', 'H', id = 'dh' }, dhm = { 'd', 'H', 'M', id = 'dhm' }, ymdh = { 'y', 'm', 'd', 'H', id = 'ymdh' }, ymdhm = { 'y', 'm', 'd', 'H', 'M', id = 'ymdhm' }, ymwdh = { 'y', 'm', 'w', 'd', 'H', id = 'ymwdh' }, ymwdhm = { 'y', 'm', 'w', 'd', 'H', 'M', id = 'ymwdhm' }, },	sortable = { off = false, on = 'sortable_on', debug = 'sortable_debug', }, }

local function date_extract(frame) -- Return part of a date after performing an optional operation. local Date = get_exports(frame) local args = frame:getParent.args local parms = {} for i, v in ipairs(args) do		parms[i] = v	end if yes(args.fix) then table.insert(parms, 'fix') end if yes(args.partial) then table.insert(parms, 'partial') end local date = Date(unpack(parms)) if not date then return message('Need valid date') end local add = strip_to_nil(args.add) if add then for item in add:gmatch('%S+') do			date = date + item if not date then return message('Cannot add "' .. item .. '"') end end end local prefix, result local sortable = translate_parameters.sortable[args.sortable] if sortable then local value = (date.partial and date.partial.first or date).jdz prefix = make_sort(value, sortable) end local show = strip_to_nil(args.show) or 'dmy' if show ~= 'hide' then result = date[show] if result == nil then result = date:text(show) elseif type(result) == 'boolean' then result = result and '1' or '0' else result = tostring(result) end end return (prefix or '') .. (result or '') end

local function make_text(values, components, names, options) -- Return wikitext representing an age or duration. local text = collection local count = #values local sep = names.sep or '' for i, v in ipairs(values) do -- v is a number (say 4 for 4 years), or a table ({4,5} for 4 or 5 years). local islist = type(v) == 'table' if (islist or v > 0) or (text.n == 0 and i == count) or (text.n > 0 and components.keepzero) then local fmt, vstr if i == 1 and options.format == 'format_commas' then -- Numbers after the first should be small and not need formatting. fmt = formatnumber else fmt = tostring end if islist then local join = options.range == 'dash' and '–' or ' or ' vstr = fmt(v[1]) .. join .. fmt(v[2]) else vstr = fmt(v) end local name = names[components[i]] if name then local plural = names.plural if not plural or (islist and v[2] or v) == 1 then plural = '' end text:add(vstr .. sep .. name .. plural) else text:add(vstr) end end end local first, last if options.join == 'sep_space' then first = ' ' last = ' ' elseif options.join == 'sep_comma' then first = ', ' last = ', ' elseif options.join == 'sep_serialcomma' and text.n > 2 then first = ', ' last = ', and ' else first = ', ' last = ' and ' end for i, v in ipairs(text) do		if i < text.n then text[i] = v .. (i + 1 < text.n and first or last) end end local sign = '' if options.isnegative then -- Do not display negative zero. if text.n > 1 or (text.n == 1 and text[1]:sub(1, 1) ~= '0' ) then if options.format == 'format_raw' then sign = '-' -- plain hyphen so result can be used in a calculation else sign = '−' -- Unicode U+2212 MINUS SIGN end end end return (options.prefix or '') .. sign .. text:join .. (options.suffix or '') end

local function date_difference(parms) -- Return a formatted date difference using the given parameters -- which have been validated. local names = { abbr_off = { plural = 's', sep = ' ', y = 'year', m = 'month', w = 'week', d = 'day', H = 'hour', M = 'minute', },		abbr_on = { y = 'y', m = 'm', w = 'w', d = 'd', H = 'h', M = 'm', },		abbr_infant = {     -- for plural = 's', sep = ' ', y = 'yr', m = 'mo', w = 'wk', d = 'day', H = 'hr', M = 'min', },		abbr_raw = {}, }	local diff = parms.diff -- must be a valid date difference local show = parms.show -- may be nil; default is set below local abbr = parms.abbr or 'abbr_off' local default_join if abbr ~= 'abbr_off' then default_join = 'sep_space' end if not show then show = 'ymd' if parms.disp == 'disp_age' then if diff.years < 3 then default_join = 'sep_space' if diff.years >= 1 then show = 'ym' else show = 'md' end else show = 'y'			end end end if type(show) ~= 'table' then show = translate_parameters.show[show] end if parms.disp == 'disp_raw' then default_join = 'sep_space' abbr = 'abbr_raw' elseif parms.want_sc then default_join = 'sep_serialcomma' end local diff_options = { round = parms.round, duration = parms.want_duration, range = parms.range and true or nil, }	local prefix if parms.sortable then local value = diff.age_days + (parms.want_duration and 1 or 0) -- days and fraction of a day if diff.isnegative then value = -value end prefix = make_sort(value, parms.sortable) end local text_options = { prefix = prefix, suffix = parms.suffix, -- not currently used format = parms.format, join = parms.sep or default_join, isnegative = diff.isnegative, range = parms.range, }	if show.id == 'hide' then return prefix or '' end local values = { diff:age(show.id, diff_options) } return make_text(values, show, names[abbr], text_options) end

local function get_dates(frame, getopt) -- Parse template parameters and return one of: -- * date        (a date table, if single) -- * date1, date2 (two date tables, if not single) -- * text        (a string error message) -- A missing date is replaced with the current date. -- If want_mixture is true, a missing date component is replaced -- from the current date, so can get a bizarre mixture of -- specified/current y/m/d as has been done by some "age" templates. -- Some results may be placed in table getopt. local Date, current_date = get_exports(frame) getopt = getopt or {} local fix = getopt.fix and 'fix' or '' local partial = getopt.range and 'partial' or '' local args = frame:getParent.args local fields = {} local is_named = args.year or args.year1 or args.year2 or		args.month or args.month1 or args.month2 or		args.day or args.day1 or args.day2 if is_named then fields[1] = args.year1 or args.year fields[2] = args.month1 or args.month fields[3] = args.day1 or args.day fields[4] = args.year2 fields[5] = args.month2 fields[6] = args.day2 else for i = 1, 6 do			fields[i] = args[i] end end local imax = 0 for i = 1, 6 do		fields[i] = strip_to_nil(fields[i]) if fields[i] then imax = i		end end local single = getopt.single local dates = {} if is_named or imax > 2 then local nr_dates = single and 1 or 2 if getopt.want_mixture then -- Cannot be partial since empty fields are set from current. local components = { 'year', 'month', 'day' } for i = 1, nr_dates * 3 do				fields[i] = fields[i] or current_date[components[i > 3 and i - 3 or i]] end for i = 1, nr_dates do				local index = i == 1 and 1 or 4 dates[i] = Date(fields[index], fields[index+1], fields[index+2]) end else for i = 1, nr_dates do				local index = i == 1 and 1 or 4 local y, m, d = fields[index], fields[index+1], fields[index+2] if (partial and y) or (y and m and d) then dates[i] = Date(fix, partial, y, m, d)				elseif not (y or m or d) then dates[i] = Date('currentdate') end end end else getopt.textdates = true dates[1] = Date(fix, partial, fields[1] or 'currentdate') if not single then dates[2] = Date(fix, partial, fields[2] or 'currentdate') end end if not dates[1] then return message('Need valid year, month, day') end if single then return dates[1] end if not dates[2] then return message('Second date should be year, month, day') end return dates[1], dates[2] end

local function age_generic(frame) -- Return the result required by the specified template. -- Can use sortable=x where x = on/off/debug in any supported template. -- Some templates default to sortable=on but can be overridden with sortable=off. local name = frame.args.template if not name then return message('The template invoking this must have "|template=x" where x is the wanted operation') end local args = frame:getParent.args local specs = { age_days = {               -- 8974 days show = 'd', disp = 'disp_raw', },		age_days_nts = {           -- show = 'd', disp = 'disp_raw', format = 'format_commas', sortable = 'on', },		duration_days = {          -- show = 'd', disp = 'disp_raw', duration = true, },		duration_days_nts = {      -- show = 'd', disp = 'disp_raw', format = 'format_commas', sortable = 'on', duration = true, },		age_full_years = {         -- 24 show = 'y', abbr = 'abbr_raw', },		age_full_years_nts = {     -- 24 show = 'y', abbr = 'abbr_raw', format = 'format_commas', sortable = 'on', },		age_in_years = {           -- 24 years show = 'y', abbr = 'abbr_raw', negative = 'error', range = 'dash', },		age_in_years_nts = {       -- show = 'y', abbr = 'abbr_raw', negative = 'error', range = 'dash', format = 'format_commas', sortable = 'on', },		age_infant = {             -- -- Do not set show because special processing is done later. abbr = yes(args.abbr) and 'abbr_infant' or 'abbr_off', disp = 'disp_age', sep = 'sep_space', sortable = 'on', },		age_m = {                  -- show = 'm', disp = 'disp_raw', },		age_w = {                  -- show = 'w', disp = 'disp_raw', },		age_wd = {                 -- show = 'wd', },		age_yd = {                 -- 24 years, 214 days show = 'yd', sep = args.sep ~= 'and' and 'sep_comma' or nil, sortable = 'on', },		age_ym = {                 -- 24 years, 7 months show = 'ym', sep = 'sep_comma', },		age_ymd = {                -- 24 years, 7 months, 4 days show = 'ymd', range = true, },		age_ymwd = {               -- show = 'ymwd', want_mixture = true, },	}	local spec = specs[name] if not spec then return message('The specified template name is not valid') end if name == 'age_days' then local su = strip_to_nil(args['show unit']) if su then if su == 'abbr' or su == 'full' then spec.disp = nil spec.abbr = su == 'abbr' and 'abbr_on' or nil end end end local range = spec.range or yes(args.range) or (args.range == 'dash' and 'dash' or nil) local getopt = { fix = yes(args.fix), range = range, want_mixture = spec.want_mixture, }	local date1, date2 = get_dates(frame, getopt) if type(date1) == 'string' then return date1 end local format = strip_to_nil(args.format) if format then format = 'format_' .. format elseif name == 'age_days' and getopt.textdates then format = 'format_commas' end local parms = { diff = date2 - date1, want_duration = spec.duration or yes(args.duration), range = range, want_sc = yes(args.sc), show = args.show == 'hide' and 'hide' or spec.show, abbr = spec.abbr, disp = spec.disp, format = format or spec.format, round = yes(args.round), sep = spec.sep, sortable = translate_parameters.sortable[args.sortable or spec.sortable], }	if (spec.negative or frame.args.negative) == 'error' and parms.diff.isnegative then return message('The second date should not be before the first date') end return date_difference(parms) end

local function date_to_gsd(frame) -- This implements. -- Return Gregorian serial date of the given date, or the current date. -- The returned value is negative for dates before 1 January 1 AD -- despite the fact that GSD is not defined for such dates. local date = get_dates(frame, { want_mixture=true, single=true }) if type(date) == 'string' then return date end return tostring(date.gsd) end

local function jd_to_date(frame) -- Return formatted date from a Julian date. -- The result includes a time if the input includes a fraction. -- The word 'Julian' is accepted for the Julian calendar. local Date = get_exports(frame) local args = frame:getParent.args local date = Date('juliandate', args[1], args[2]) if date then return date:text end return message('Need valid Julian date number') end

local function date_to_jd(frame) -- Return Julian date (a number) from a date which may include a time, -- or the current date ('currentdate') or current date and time ('currentdatetime'). -- The word 'Julian' is accepted for the Julian calendar. local Date = get_exports(frame) local args = frame:getParent.args local date = Date(args[1], args[2], args[3], args[4], args[5], args[6], args[7]) if date then return tostring(date.jd) end return message('Need valid year/month/day or "currentdate"') end

local function time_interval(frame) -- This implements. -- There are two positional arguments: date1, date2. -- The default for each is the current date and time. -- Result is date2 - date1 formatted. local Date = get_exports(frame) local args = frame:getParent.args local parms = { want_duration = yes(args.duration), range = yes(args.range) or (args.range == 'dash' and 'dash' or nil), want_sc = yes(args.sc), }	local fix = yes(args.fix) and 'fix' or '' local date1 = Date(fix, 'partial', strip_to_nil(args[1]) or 'currentdatetime') if not date1 then return message('Invalid start date in first parameter') end local date2 = Date(fix, 'partial', strip_to_nil(args[2]) or 'currentdatetime') if not date2 then return message('Invalid end date in second parameter') end parms.diff = date2 - date1 for argname, translate in pairs(translate_parameters) do		local parm = strip_to_nil(args[argname]) if parm then parm = translate[parm] if parm == nil then -- test for nil because false is a valid setting return message('Parameter ' .. argname .. '=' .. args[argname] .. ' is invalid') end parms[argname] = parm end end if parms.round then local round = parms.round local show = parms.show if round ~= 'on' then if show then if show.id ~= round then return message('Parameter show=' .. args.show .. ' conflicts with round=' .. args.round) end else parms.show = translate_parameters.show[round] end end parms.round = true end return date_difference(parms) end

return { age_generic = age_generic,        -- can emulate several age templates gsd = date_to_gsd,                -- Template:Gregorian_serial_date extract = date_extract,           -- Template:Extract jd_to_date = jd_to_date,          -- Template:? JULIANDAY = date_to_jd,           -- Template:JULIANDAY time_interval = time_interval,    -- Template:Time_interval }