Difference between revisions of "Module:Age"

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imported>Platonides
m
imported>Johnuniq
(fix bug that can occur in {{age in years, months, weeks and days}} if attempt to make an invalid yyyy-02-29 date due to unwise wantMixture used to emulate original template)
 
(20 intermediate revisions by 4 users not shown)
Line 1: Line 1:
−
--[[ Code for some date functions, including implementations of:
+
-- Implement various "age of" and other date-related templates.
−
        {{Age in days}}                age_days
 
−
        {{Age in years and months}}    age_ym
 
−
        {{Gregorian serial date}}      gsd_ymd
 
−
Calendar functions will be needed in many areas, so this may be superseded
 
−
by some other system, perhaps using PHP functions accessed via mediawiki.
 
−
]]
 
  
−
local MINUS = '−' -- Unicode U+2212 MINUS SIGN
+
local mtext = {
 +
-- Message and other text that should be localized.
 +
['mt-bad-param1'] =            'Invalid parameter $1',
 +
['mt-bad-param2'] =            'Parameter $1=$2 is invalid',
 +
['mt-bad-show'] =              'Parameter show=$1 is not supported here',
 +
['mt-cannot-add'] =            'Cannot add "$1"',
 +
['mt-conflicting-show'] =      'Parameter show=$1 conflicts with round=$2',
 +
['mt-date-wrong-order'] =      'The second date must be later in time than the first date',
 +
['mt-dd-future'] =              'Death date (first date) must not be in the future',
 +
['mt-dd-wrong-order'] =        'Death date (first date) must be later in time than the birth date (second date)',
 +
['mt-invalid-bd-age'] =        'Invalid birth date for calculating age',
 +
['mt-invalid-dates-age'] =      'Invalid dates for calculating age',
 +
['mt-invalid-end'] =            'Invalid end date in second parameter',
 +
['mt-invalid-start'] =          'Invalid start date in first parameter',
 +
['mt-need-jdn'] =              'Need valid Julian date number',
 +
['mt-need-valid-bd'] =          'Need valid birth date: year, month, day',
 +
['mt-need-valid-bd2'] =        'Need valid birth date (second date): year, month, day',
 +
['mt-need-valid-date'] =        'Need valid date',
 +
['mt-need-valid-dd'] =          'Need valid death date (first date): year, month, day',
 +
['mt-need-valid-ymd'] =        'Need valid year, month, day',
 +
['mt-need-valid-ymd-current'] = 'Need valid year|month|day or "currentdate"',
 +
['mt-need-valid-ymd2'] =        'Second date should be year, month, day',
 +
['mt-template-bad-name'] =      'The specified template name is not valid',
 +
['mt-template-x'] =            'The template invoking this must have "|template=x" where x is the wanted operation',
 +
['txt-age'] =                  '(age ',
 +
['txt-aged'] =                  ' (aged ',
 +
['txt-and'] =                  ' and ',
 +
['txt-comma-and'] =            ', and ',
 +
['txt-error'] =                'Error: ',
 +
['txt-or'] =                    ' or ',
 +
}
  
−
local function number_name(number, singular, plural, sep)
+
local translate, from_en, to_en, isZero
−
    -- Return the given number, converted to a string, with the
+
if translate then
−
    -- separator (default space) and singular or plural name appended.
+
-- Functions to translate from en to local language and reverse go here.
−
    plural = plural or (singular .. 's')
+
-- See example at [[:bn:Module:বয়স]].
−
    sep = sep or ' '
+
else
−
    return tostring(number) .. sep .. ((number == 1) and singular or plural)
+
from_en = function (text)
−
    -- this uses an interesting trick of Lua:
+
return text
−
    --  * and returns false if the first argument is false, and the second otherwise, so (number==1) and singular returns singular if its 1, returns false if it is only 1
+
end
−
    --  * or returns the first argument if it is not false, and the second argument if the first is false
+
isZero = function (text)
−
    --  * so, if number is 1, and evaluates (true and singular) returning (singular); or evaluates (singular or plural), finds singular non-false, and returns singular
+
return tonumber(text) == 0
−
    --  * but, if number is not 1, and evaluates (false and singular) returning (false); or evaluates (false or plural), and is forced to return plural
+
end
 
end
 
end
  
−
local function strip_to_nil(text)
+
local _Date, _currentDate
−
    -- If text is a non-blank string, return its content with no leading
+
local function getExports(frame)
−
    -- or trailing whitespace.
+
-- Return objects exported from the date module or its sandbox.
−
    -- Otherwise return nil (a nil or empty string argument gives a nil
+
if not _Date then
−
    -- result, as does a string argument of only whitespace).
+
local sandbox = frame:getTitle():find('sandbox', 1, true) and '/sandbox' or ''
−
    if type(text) == 'string' then
+
local datemod = require('Module:Date' .. sandbox)
−
        local result = text:match("^%s*(.-)%s*$")
+
local realDate = datemod._Date
−
        if result ~= '' then
+
_currentDate = datemod._current
−
            return result
+
if to_en then
−
        end
+
_Date = function (...)
−
    end
+
local args = {}
−
    return nil
+
for i, v in ipairs({...}) do
 +
args[i] = to_en(v)
 +
end
 +
return realDate(unpack(args))
 +
end
 +
else
 +
_Date = realDate
 +
end
 +
end
 +
return _Date, _currentDate
 
end
 
end
  
−
local function is_leap_year(year)
+
local Collection  -- a table to hold items
−
    -- Return true if year is a leap year, assuming Gregorian calendar.
+
Collection = {
−
    return year % 4 == 0 and (year % 100 ~= 0 or year % 400 == 0)
+
add = function (self, item)
 +
if item ~= nil then
 +
self.n = self.n + 1
 +
self[self.n] = item
 +
end
 +
end,
 +
join = function (self, sep)
 +
return table.concat(self, sep)
 +
end,
 +
remove = function (self, pos)
 +
if self.n > 0 and (pos == nil or (0 < pos and pos <= self.n)) then
 +
self.n = self.n - 1
 +
return table.remove(self, pos)
 +
end
 +
end,
 +
sort = function (self, comp)
 +
table.sort(self, comp)
 +
end,
 +
new = function ()
 +
return setmetatable({n = 0}, Collection)
 +
end
 +
}
 +
Collection.__index = Collection
 +
 
 +
local function stripToNil(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
 
end
  
−
local function days_in_month(year, month)
+
local function yes(parameter)
−
    -- Return number of days (1..31) in given month (1..12).
+
-- Return true if parameter should be interpreted as "yes".
−
    local month_days = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+
-- Do not want to accept mixed upper/lowercase unless done by current templates.
−
    if month == 2 and is_leap_year(year) then
+
-- Need to accept "on" because "round=on" is wanted.
−
        return 29
+
return ({ y = true, yes = true, on = true })[parameter]
−
    end
 
−
    return month_days[month]
 
 
end
 
end
  
−
-- A table to get current year/month/day (UTC), but only if needed.
+
local function message(msg, id)
−
local current = setmetatable({}, {
+
-- Return formatted message text for an error or warning.
−
        __index = function (self, key)
+
local function getText(msg)
−
            local d = os.date('!*t')
+
return mtext[msg] or error('Bug: message "' .. tostring(msg) .. '" not defined')
−
            self.year = d.year
+
end
−
            self.month = d.month
+
local text
−
            self.day = d.day
+
if type(msg) == 'table' then
−
            return rawget(self, key)
+
text = getText(msg[1])
−
        end
+
local rep = {}
−
    })
+
for i, v in ipairs(msg) do
 +
if i > 1 then
 +
rep['$' .. (i - 1)] = v
 +
end
 +
end
 +
text = text:gsub('$%d+', rep)
 +
else
 +
text = getText(msg)
 +
end
 +
local categories = {
 +
error = '[[Category:Age error]]',
 +
warning = '[[Category:Age error]]',  -- same as error until determine whether 'Age warning' would be worthwhile
 +
}
 +
local a, b, category
 +
if id == 'warning' then
 +
a = '<sup>[<i>'
 +
b = '</i>]</sup>'
 +
else
 +
a = '<strong class="error">' .. getText('txt-error')
 +
b = '</strong>'
 +
end
 +
if mw.title.getCurrentTitle():inNamespaces(0) then
 +
-- Category only in namespaces: 0=article.
 +
category = categories[id or 'error']
 +
end
 +
return
 +
a ..
 +
mw.text.nowiki(text) ..
 +
b ..
 +
(category or '')
 +
end
  
−
local function date_component(named, positional, component)
+
local function formatNumber(number)
−
    -- Return the first of the two arguments that is not nil and is not empty.
+
-- Return the given number formatted with commas as group separators,
−
    -- If both are nil, return the current date component, if specified.
+
-- given that the number is an integer.
−
    -- The returned value is nil or is a number.
+
local numstr = tostring(number)
−
    -- This translates empty arguments passed to the template to nil, and
+
local length = #numstr
−
    -- optionally replaces a nil argument with a value from the current date.
+
local places = Collection.new()
−
    named = strip_to_nil(named)
+
local pos = 0
−
    if named then
+
repeat
−
        return tonumber(named)
+
places:add(pos)
−
    end
+
pos = pos + 3
−
    positional = strip_to_nil(positional)
+
until pos >= length
−
    if positional then
+
places:add(length)
−
        return tonumber(positional)
+
local groups = Collection.new()
−
    end
+
for i = places.n, 2, -1 do
−
    if component then
+
local p1 = length - places[i] + 1
−
        return current[component]
+
local p2 = length - places[i - 1]
−
    end
+
groups:add(numstr:sub(p1, p2))
−
    return nil
+
end
 +
return groups:join(',')
 
end
 
end
  
−
local function gsd(year, month, day)
+
local function spellNumber(number, options, i)
−
    -- Return the Gregorian serial day (an integer >= 1) for the given date,
+
-- Return result of spelling number, or
−
    -- or return nil if the date is invalid (only check that year >= 1).
+
-- return number (as a string) if cannot spell it.
−
    -- This is the number of days from the start of 1 AD (there is no year 0).
+
-- i == 1 for the first number which can optionally start with an uppercase letter.
−
    -- This code implements the logic in [[Template:Gregorian serial date]].
+
number = tostring(number)
−
    if year < 1 then
+
return require('Module:ConvertNumeric').spell_number(
−
        return nil
+
number,
−
    end
+
nil,                      -- fraction numerator
−
    local floor = math.floor
+
nil,                      -- fraction denominator
−
    local days_this_year = (month - 1) * 30.5 + day
+
i == 1 and options.upper,  -- true: 'One' instead of 'one'
−
    if month > 2 then
+
not options.us,            -- true: use 'and' between tens/ones etc
−
        if is_leap_year(year) then
+
options.adj,              -- true: hyphenated
−
            days_this_year = days_this_year - 1
+
options.ordinal            -- true: 'first' instead of 'one'
−
        else
+
) or number
−
            days_this_year = days_this_year - 2
 
−
        end
 
−
        if month > 8 then
 
−
            days_this_year = days_this_year + 0.9
 
−
        end
 
−
    end
 
−
    days_this_year = floor(days_this_year + 0.5)
 
−
    year = year - 1
 
−
    local days_from_past_years = year * 365
 
−
        + floor(year / 4)
 
−
        - floor(year / 100)
 
−
        + floor(year / 400)
 
−
    return days_from_past_years + days_this_year
 
 
end
 
end
  
−
local Date = {
+
local function makeExtra(args, flagCurrent)
−
    -- A naive date that assumes the Gregorian calendar always applied.
+
-- Return extra text that will be inserted before the visible result
−
    year = 0,   -- 1 to 9999 (0 if never set)
+
-- but after any sort key.
−
    month = 1, -- 1 to 12
+
local extra = args.prefix or ''
−
    day = 1,    -- 1 to 31
+
if mw.ustring.len(extra) > 1 then
−
    isvalid = false,
+
-- Parameter "~" gives "~3" whereas "over" gives "over 3".
−
    new = function (self, o)
+
if extra:sub(-6, -1) ~= '&nbsp;' then
−
        o = o or {}
+
extra = extra .. ' '
−
        setmetatable(o, self)
+
end
−
        self.__index = self
+
end
−
        return o
+
if flagCurrent then
−
    end
+
extra = '<span class="currentage"></span>' .. extra
 +
end
 +
return extra
 +
end
 +
 
 +
local function makeSort(value, sortable)
 +
-- Return a sort key if requested.
 +
-- Assume value is a valid number which has not overflowed.
 +
if sortable == 'sortable_table' or 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)
 +
if value > 0 then
 +
sortKey = 7000 + mag
 +
else
 +
sortKey = 2999 - mag
 +
value = value + 10^(mag+1)
 +
end
 +
sortKey = string.format('%d', sortKey) .. string.format('%015.0f', math.floor(value * 10^(14-mag)))
 +
end
 +
local result
 +
if sortable == 'sortable_table' then
 +
result = 'data-sort-value="_SORTKEY_"|'
 +
elseif sortable == 'sortable_debug' then
 +
result = '<span data-sort-value="_SORTKEY_♠"><span style="border:1px solid">_SORTKEY_♠</span></span>'
 +
else
 +
result = '<span data-sort-value="_SORTKEY_♠"></span>'
 +
end
 +
return result:gsub('_SORTKEY_', sortKey)
 +
end
 +
end
 +
 
 +
local translateParameters = {
 +
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' },
 +
h = { 'H', id = 'h' },
 +
hm = { 'H', 'M', id = 'hm' },
 +
hms = { 'H', 'M', 'S', id = 'hms' },
 +
d = { 'd', id = 'd' },
 +
dh = { 'd', 'H', id = 'dh' },
 +
dhm = { 'd', 'H', 'M', id = 'dhm' },
 +
dhms = { 'd', 'H', 'M', 'S', id = 'dhms' },
 +
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',
 +
table = 'sortable_table',
 +
debug = 'sortable_debug',
 +
},
 
}
 
}
  
−
function Date:__lt(rhs)
+
local spellOptions = {
−
    -- Return true if self < rhs.
+
cardinal = {},
−
    if self.year < rhs.year then
+
Cardinal = { upper = true },
−
        return true
+
cardinal_us = { us = true },
−
    elseif self.year == rhs.year then
+
Cardinal_us = { us = true, upper = true },
−
        if self.month < rhs.month then
+
ordinal = { ordinal = true },
−
            return true
+
Ordinal = { ordinal = true, upper = true },
−
        elseif self.month == rhs.month then
+
ordinal_us = { ordinal = true, us = true },
−
            return self.day < rhs.day
+
Ordinal_us = { ordinal = true, us = true, upper = true },
−
        end
+
}
−
    end
+
 
−
    return false
+
local function dateExtract(frame)
−
    -- probably simplify to return (self.year < rhs.year) or ((self.year == rhs.year) and ((self.month < rhs.month) or ((self.month == rhs.month) and (self.day < rhs.day))))
+
-- Return part of a date after performing an optional operation.
−
    -- would be just as efficient, as lua does not evaluate second argument of (true or second_argument)
+
local Date = getExports(frame)
−
    -- or similarly return self.year < rhs.year ? true : self.year > rhs.year ? false : self.month < rhs.month ? true : self.month > rhs.month ? false : self.day < rhs.day
+
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 show = stripToNil(args.show) or 'dmy'
 +
local date = Date(unpack(parms))
 +
if not date then
 +
if show == 'format' then
 +
return 'error'
 +
end
 +
return message('mt-need-valid-date')
 +
end
 +
local add = stripToNil(args.add)
 +
if add then
 +
for item in add:gmatch('%S+') do
 +
date = date + item
 +
if not date then
 +
return message({ 'mt-cannot-add', item })
 +
end
 +
end
 +
end
 +
local sortKey, result
 +
local sortable = translateParameters.sortable[args.sortable]
 +
if sortable then
 +
local value = (date.partial and date.partial.first or date).jdz
 +
sortKey = makeSort(value, sortable)
 +
end
 +
if show ~= 'hide' then
 +
result = date[show]
 +
if result == nil then
 +
result = from_en(date:text(show))
 +
elseif type(result) == 'boolean' then
 +
result = result and '1' or '0'
 +
else
 +
result = from_en(tostring(result))
 +
end
 +
end
 +
return (sortKey or '') .. makeExtra(args) .. (result or '')
 +
end
 +
 
 +
local function rangeJoin(range)
 +
-- Return text to be used between a range of ages.
 +
return range == 'dash' and '–' or mtext['txt-or']
 +
end
 +
 
 +
local function makeText(values, components, names, options, noUpper)
 +
-- Return wikitext representing an age or duration.
 +
local text = Collection.new()
 +
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 options.spell then
 +
fmt = function(number)
 +
return spellNumber(number, options.spell, noUpper or i)
 +
end
 +
elseif 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
 +
vstr = fmt(v[1]) .. rangeJoin(options.range)
 +
noUpper = true
 +
vstr = vstr .. 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 = mtext['txt-comma-and']
 +
else
 +
first = ', '
 +
last = mtext['txt-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.sortKey or '') ..
 +
(options.extra or '') ..
 +
sign ..
 +
text:join() ..
 +
(options.suffix or '')
 
end
 
end
  
−
function Date:set_current()
+
local function dateDifference(parms)
−
    -- Set date from current time (UTC) and return self.
+
-- Return a formatted date difference using the given parameters
−
    self.year = current.year
+
-- which have been validated.
−
    self.month = current.month
+
local names = {
−
    self.day = current.day
+
abbr_off = {
−
    self.isvalid = true
+
plural = 's',
−
    return self
+
sep = '&nbsp;',
 +
y = 'year',
 +
m = 'month',
 +
w = 'week',
 +
d = 'day',
 +
H = 'hour',
 +
M = 'minute',
 +
S = 'second',
 +
},
 +
abbr_on = {
 +
y = 'y',
 +
m = 'm',
 +
w = 'w',
 +
d = 'd',
 +
H = 'h',
 +
M = 'm',
 +
S = 's',
 +
},
 +
abbr_infant = {      -- for {{age for infant}}
 +
plural = 's',
 +
sep = '&nbsp;',
 +
y = 'yr',
 +
m = 'mo',
 +
w = 'wk',
 +
d = 'day',
 +
H = 'hr',
 +
M = 'min',
 +
S = 'sec',
 +
},
 +
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 defaultJoin
 +
if abbr ~= 'abbr_off' then
 +
defaultJoin = 'sep_space'
 +
end
 +
if not show then
 +
show = 'ymd'
 +
if parms.disp == 'disp_age' then
 +
if diff.years < 3 then
 +
defaultJoin = '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 = translateParameters.show[show]
 +
end
 +
if parms.disp == 'disp_raw' then
 +
defaultJoin = 'sep_space'
 +
abbr = 'abbr_raw'
 +
elseif parms.wantSc then
 +
defaultJoin = 'sep_serialcomma'
 +
end
 +
local diffOptions = {
 +
round = parms.round,
 +
duration = parms.wantDuration,
 +
range = parms.range and true or nil,
 +
}
 +
local sortKey
 +
if parms.sortable then
 +
local value = diff.age_days + (parms.wantDuration and 1 or 0) -- days and fraction of a day
 +
if diff.isnegative then
 +
value = -value
 +
end
 +
sortKey = makeSort(value, parms.sortable)
 +
end
 +
local textOptions = {
 +
extra = parms.extra,
 +
format = parms.format,
 +
join = parms.sep or defaultJoin,
 +
isnegative = diff.isnegative,
 +
range = parms.range,
 +
sortKey = sortKey,
 +
spell = parms.spell,
 +
suffix = parms.suffix,  -- not currently used
 +
}
 +
if show.id == 'hide' then
 +
return sortKey or ''
 +
end
 +
local values = { diff:age(show.id, diffOptions) }
 +
if values[1] then
 +
return makeText(values, show, names[abbr], textOptions)
 +
end
 +
if diff.partial then
 +
-- Handle a more complex range such as
 +
-- {{age_yd|20 Dec 2001|2003|range=yes}} → 1 year, 12 days or 2 years, 11 days
 +
local opt = {
 +
format = textOptions.format,
 +
join = textOptions.join,
 +
isnegative = textOptions.isnegative,
 +
spell = textOptions.spell,
 +
}
 +
return
 +
(textOptions.sortKey or '') ..
 +
makeText({ diff.partial.mindiff:age(show.id, diffOptions) }, show, names[abbr], opt) ..
 +
rangeJoin(textOptions.range) ..
 +
makeText({ diff.partial.maxdiff:age(show.id, diffOptions) }, show, names[abbr], opt, true) ..
 +
(textOptions.suffix or '')
 +
end
 +
return message({ 'mt-bad-show', show.id })
 
end
 
end
  
−
function Date:set_ymd(y, m, d)
+
local function getDates(frame, getopt)
−
    -- Set date from year, month, day (strings or numbers) and return self.
+
-- Parse template parameters and return one of:
−
    -- LATER: If m is a name like "March" or "mar", translate it to a month.
+
-- * date        (a date table, if single)
−
    y = tonumber(y)
+
-- * date1, date2 (two date tables, if not single)
−
    m = tonumber(m)
+
-- * text        (a string error message)
−
    d = tonumber(d)
+
-- A missing date is optionally replaced with the current date.
−
    if type(y) == 'number' and type(m) == 'number' and type(d) == 'number' then
+
-- If wantMixture is true, a missing date component is replaced
−
        self.year = y
+
-- from the current date, so can get a bizarre mixture of
−
        self.month = m
+
-- specified/current y/m/d as has been done by some "age" templates.
−
        self.day = d
+
-- Some results may be placed in table getopt.
−
        self.isvalid = (1 <= y and y <= 9999 and 1 <= m and m <= 12 and
+
local Date, currentDate = getExports(frame)
−
                        1 <= d and d <= days_in_month(y, m))
+
getopt = getopt or {}
−
    end
+
local function flagCurrent(text)
−
    return self
+
-- This allows the calling template to detect if the current date has been used,
 +
-- that is, whether both dates have been entered in a template expecting two.
 +
-- For example, an infobox may want the age when an event occurred, not the current age.
 +
-- Don't bother detecting if wantMixture is used because not needed and it is a poor option.
 +
if not text then
 +
if getopt.noMissing then
 +
return nil  -- this gives a nil date which gives an error
 +
end
 +
text = 'currentdate'
 +
if getopt.flag == 'usesCurrent' then
 +
getopt.usesCurrent = true
 +
end
 +
end
 +
return text
 +
end
 +
local args = frame:getParent().args
 +
local fields = {}
 +
local isNamed = 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 isNamed 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] = stripToNil(fields[i])
 +
if fields[i] then
 +
imax = i
 +
end
 +
if getopt.omitZero and i % 3 ~= 1 then  -- omit zero months and days as unknown values but keep year 0 which is 1 BCE
 +
if isZero(fields[i]) then
 +
fields[i] = nil
 +
getopt.partial = true
 +
end
 +
end
 +
end
 +
local fix = getopt.fix and 'fix' or ''
 +
local partialText = getopt.partial and 'partial' or ''
 +
local dates = {}
 +
if isNamed or imax >= 3 then
 +
local nrDates = getopt.single and 1 or 2
 +
if getopt.wantMixture then
 +
-- Cannot be partial since empty fields are set from current.
 +
local components = { 'year', 'month', 'day' }
 +
for i = 1, nrDates * 3 do
 +
fields[i] = fields[i] or currentDate[components[i > 3 and i - 3 or i]]
 +
end
 +
for i = 1, nrDates do
 +
local index = i == 1 and 1 or 4
 +
local y, m, d = fields[index], fields[index+1], fields[index+2]
 +
if (m == 2 or m == '2') and (d == 29 or d == '29') then
 +
-- Workaround error with following which attempt to use invalid date 2001-02-29.
 +
-- {{age_ymwd|year1=2001|year2=2004|month2=2|day2=29}}
 +
-- {{age_ymwd|year1=2001|month1=2|year2=2004|month2=1|day2=29}}
 +
-- TODO Get rid of wantMixture because even this ugly code does not handle
 +
-- 'Feb' or 'February' or 'feb' or 'february'.
 +
if not ((y % 4 == 0 and y % 100 ~= 0) or y % 400 == 0) then
 +
d = 28
 +
end
 +
end
 +
dates[i] = Date(y, m, d)
 +
end
 +
else
 +
-- If partial dates are allowed, accept
 +
--    year only, or
 +
--    year and month only
 +
-- Do not accept year and day without a month because that makes no sense
 +
-- (and because, for example, Date('partial', 2001, nil, 12) sets day = nil, not 12).
 +
for i = 1, nrDates do
 +
local index = i == 1 and 1 or 4
 +
local y, m, d = fields[index], fields[index+1], fields[index+2]
 +
if (getopt.partial and y and (m or not d)) or (y and m and d) then
 +
dates[i] = Date(fix, partialText, y, m, d)
 +
elseif not y and not m and not d then
 +
dates[i] = Date(flagCurrent())
 +
end
 +
end
 +
end
 +
else
 +
getopt.textdates = true  -- have parsed each date from a single text field
 +
dates[1] = Date(fix, partialText, flagCurrent(fields[1]))
 +
if not getopt.single then
 +
dates[2] = Date(fix, partialText, flagCurrent(fields[2]))
 +
end
 +
end
 +
if not dates[1] then
 +
return message(getopt.missing1 or 'mt-need-valid-ymd')
 +
end
 +
if getopt.single then
 +
return dates[1]
 +
end
 +
if not dates[2] then
 +
return message(getopt.missing2 or 'mt-need-valid-ymd2')
 +
end
 +
return dates[1], dates[2]
 
end
 
end
  
−
local DateDiff = {
+
local function ageGeneric(frame)
−
    -- Simple difference between two dates, assuming Gregorian calendar.
+
-- Return the result required by the specified template.
−
    isnegative = false, -- true if second date is before first
+
-- Can use sortable=x where x = on/table/off/debug in any supported template.
−
    years = 0,
+
-- Some templates default to sortable=on but can be overridden.
−
    months = 0,
+
local name = frame.args.template
−
    days = 0,
+
if not name then
−
     new = function (self, o)
+
return message('mt-template-x')
−
        o = o or {}
+
end
−
        setmetatable(o, self)
+
local args = frame:getParent().args
−
        self.__index = self
+
local specs = {
−
        return o
+
age_days = {                -- {{age in days}}
−
    end
+
show = 'd',
−
}
+
disp = 'disp_raw',
 +
},
 +
age_days_nts = {           -- {{age in days nts}}
 +
show = 'd',
 +
disp = 'disp_raw',
 +
format = 'format_commas',
 +
sortable = 'on',
 +
},
 +
duration_days = {          -- {{duration in days}}
 +
show = 'd',
 +
disp = 'disp_raw',
 +
duration = true,
 +
},
 +
duration_days_nts = {      -- {{duration in days nts}}
 +
show = 'd',
 +
disp = 'disp_raw',
 +
format = 'format_commas',
 +
sortable = 'on',
 +
duration = true,
 +
},
 +
age_full_years = {          -- {{age}}
 +
show = 'y',
 +
abbr = 'abbr_raw',
 +
flag = 'usesCurrent',
 +
omitZero = true,
 +
range = 'no',
 +
},
 +
age_full_years_nts = {      -- {{age nts}}
 +
show = 'y',
 +
abbr = 'abbr_raw',
 +
format = 'format_commas',
 +
sortable = 'on',
 +
},
 +
age_in_years = {            -- {{age in years}}
 +
show = 'y',
 +
abbr = 'abbr_raw',
 +
negative = 'error',
 +
range = 'dash',
 +
},
 +
age_in_years_nts = {        -- {{age in years nts}}
 +
show = 'y',
 +
abbr = 'abbr_raw',
 +
negative = 'error',
 +
range = 'dash',
 +
format = 'format_commas',
 +
sortable = 'on',
 +
},
 +
age_infant = {              -- {{age for 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 = {                  -- {{age in months}}
 +
show = 'm',
 +
disp = 'disp_raw',
 +
},
 +
age_w = {                  -- {{age in weeks}}
 +
show = 'w',
 +
disp = 'disp_raw',
 +
},
 +
age_wd = {                  -- {{age in weeks and days}}
 +
show = 'wd',
 +
},
 +
age_yd = {                  -- {{age in years and days}}
 +
show = 'yd',
 +
format = 'format_commas',
 +
sep = args.sep ~= 'and' and 'sep_comma' or nil,
 +
},
 +
age_yd_nts = {              -- {{age in years and days nts}}
 +
show = 'yd',
 +
format = 'format_commas',
 +
sep = args.sep ~= 'and' and 'sep_comma' or nil,
 +
sortable = 'on',
 +
},
 +
age_ym = {                  -- {{age in years and months}}
 +
show = 'ym',
 +
sep = 'sep_comma',
 +
},
 +
age_ymd = {                -- {{age in years, months and days}}
 +
show = 'ymd',
 +
range = true,
 +
},
 +
age_ymwd = {                -- {{age in years, months, weeks and days}}
 +
show = 'ymwd',
 +
wantMixture = true,
 +
},
 +
}
 +
local spec = specs[name]
 +
if not spec then
 +
return message('mt-template-bad-name')
 +
end
 +
if name == 'age_days' then
 +
local su = stripToNil(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 partial, autofill
 +
local range = stripToNil(args.range) or spec.range
 +
if range then
 +
-- Suppose partial dates are used and age could be 11 or 12 years.
 +
-- "|range=" (empty value) has no effect (spec is used).
 +
-- "|range=yes" or spec.range == true sets range = true (gives "11 or 12")
 +
-- "|range=dash" or spec.range == 'dash' sets range = 'dash' (gives "11–12").
 +
-- "|range=no" or spec.range == 'no' sets range = nil and fills each date in the diff (gives "12").
 +
--     ("on" is equivalent to "yes", and "off" is equivalent to "no").
 +
-- "|range=OTHER" sets range = nil and rejects partial dates.
 +
range = ({ dash = 'dash', off = 'no', no = 'no', [true] = true })[range] or yes(range)
 +
if range then
 +
partial = true  -- accept partial dates with a possible age range for the result
 +
if range == 'no' then
 +
autofill = true  -- missing month/day in first or second date are filled from other date or 1
 +
range = nil
 +
end
 +
end
 +
end
 +
local getopt = {
 +
fix = yes(args.fix),
 +
flag = stripToNil(args.flag) or spec.flag,
 +
omitZero = spec.omitZero,
 +
partial = partial,
 +
wantMixture = spec.wantMixture,
 +
}
 +
local date1, date2 = getDates(frame, getopt)
 +
if type(date1) == 'string' then
 +
return date1
 +
end
 +
local format = stripToNil(args.format)
 +
local spell = spellOptions[format]
 +
if format then
 +
format = 'format_' .. format
 +
elseif name == 'age_days' and getopt.textdates then
 +
format = 'format_commas'
 +
end
 +
local parms = {
 +
diff = date2:subtract(date1, { fill = autofill }),
 +
wantDuration = spec.duration or yes(args.duration),
 +
range = range,
 +
wantSc = yes(args.sc),
 +
show = args.show == 'hide' and 'hide' or spec.show,
 +
abbr = spec.abbr,
 +
disp = spec.disp,
 +
extra = makeExtra(args, getopt.usesCurrent and format ~= 'format_raw'),
 +
format = format or spec.format,
 +
round = yes(args.round),
 +
sep = spec.sep,
 +
sortable = translateParameters.sortable[args.sortable or spec.sortable],
 +
spell = spell,
 +
}
 +
if (spec.negative or frame.args.negative) == 'error' and parms.diff.isnegative then
 +
return message('mt-date-wrong-order')
 +
end
 +
return from_en(dateDifference(parms))
 +
end
  
−
function DateDiff:set(date1, date2)
+
local function bda(frame)
−
    -- Set difference between the two dates, and return self.
+
-- Implement [[Template:Birth date and age]].
−
    -- Difference is negative if the second date is older than the first.
+
local args = frame:getParent().args
−
    local isnegative
+
local options = {
−
    if date2 < date1 then
+
missing1 = 'mt-need-valid-bd',
−
        isnegative = true
+
noMissing = true,
−
        date1, date2 = date2, date1
+
single = true,
−
    else
+
}
−
        isnegative = false
+
local date = getDates(frame, options)
−
    end
+
if type(date) == 'string' then
−
    -- It is known that date1 <= date2.
+
return date  -- error text
−
    local y1, m1, d1 = date1.year, date1.month, date1.day
+
end
−
    local y2, m2, d2 = date2.year, date2.month, date2.day
+
local Date = getExports(frame)
−
    local years, months, days = y2 - y1, m2 - m1, d2 - d1
+
local diff = Date('currentdate') - date
−
    if days < 0 then
+
if diff.isnegative or diff.years > 150 then
−
        days = days + days_in_month(y1, m1)
+
return message('mt-invalid-bd-age')
−
        months = months - 1
+
end
−
    end
+
local disp, show = 'disp_raw', 'y'
−
    if months < 0 then
+
if diff.years < 2 then
−
        months = months + 12
+
disp = 'disp_age'
−
        years = years - 1
+
if diff.years == 0 and diff.months == 0 then
−
    end
+
show = 'd'
−
    self.years, self.months, self.days, self.isnegative = years, months, days, isnegative
+
else
−
    return self
+
show = 'm'
 +
end
 +
end
 +
local df = stripToNil(args.df)  -- day first (dmy); default is month first (mdy)
 +
local result = '(<span class="bday">%-Y-%m-%d</span>) </span>' ..
 +
(df and '%-d %B %-Y' or '%B %-d, %-Y')
 +
result = from_en('<span style="display:none"> ' ..
 +
date:text(result) ..
 +
'<span class="noprint ForceAgeToShow"> ' ..
 +
mtext['txt-age'] ..
 +
dateDifference({
 +
diff = diff,
 +
show = show,
 +
abbr = 'abbr_off',
 +
disp = disp,
 +
sep = 'sep_space',
 +
}) ..
 +
')</span>')
 +
local warnings = tonumber(frame.args.warnings)
 +
if warnings and warnings > 0 then
 +
local good = {
 +
df = true,
 +
mf = true,
 +
day = true,
 +
day1 = true,
 +
month = true,
 +
month1 = true,
 +
year = true,
 +
year1 = true,
 +
}
 +
local invalid
 +
local imax = options.textdates and 1 or 3
 +
for k, _ in pairs(args) do
 +
if type(k) == 'number' then
 +
if k > imax then
 +
invalid = tostring(k)
 +
break
 +
end
 +
else
 +
if not good[k] then
 +
invalid = k
 +
break
 +
end
 +
end
 +
end
 +
if invalid then
 +
result = result .. message({ 'mt-bad-param1', invalid }, 'warning')
 +
end
 +
end
 +
return result
 
end
 
end
  
−
function DateDiff:age_ym()
+
local function dda(frame)
−
    -- Return text specifying difference in years, months.
+
-- Implement [[Template:Death date and age]].
−
    local sign = self.isnegative and MINUS or ''
+
local args = frame:getParent().args
−
    local mtext = number_name(self.months, 'month')
+
local options = {
−
    local result
+
missing1 = 'mt-need-valid-dd',
−
    if self.years > 0 then
+
missing2 = 'mt-need-valid-bd2',
−
        local ytext = number_name(self.years, 'year')
+
noMissing = true,
−
        if self.months == 0 then
+
partial = true,
−
            result = ytext
+
}
−
        else
+
local date1, date2 = getDates(frame, options)
−
            result = ytext .. ',&nbsp;' .. mtext
+
if type(date1) == 'string' then
−
        end
+
return date1
−
    else
+
end
−
        if self.months == 0 then
+
local diff = date1 - date2
−
            sign = ''
+
if diff.isnegative then
−
        end
+
return message('mt-dd-wrong-order')
−
        result = mtext
+
end
−
    end
+
local Date = getExports(frame)
−
    return sign .. result
+
local today = Date('currentdate') + 1  -- one day in future allows for timezones
 +
if date1 > today then
 +
return message('mt-dd-future')
 +
end
 +
local years
 +
if diff.partial then
 +
years = diff.partial.years
 +
years = type(years) == 'table' and years[2] or years
 +
else
 +
years = diff.years
 +
end
 +
if years > 150 then
 +
return message('mt-invalid-dates-age')
 +
end
 +
local df = stripToNil(args.df)  -- day first (dmy); default is month first (mdy)
 +
local result
 +
if date1.day then  -- y, m, d known
 +
result = (df and
 +
'%-d %B %-Y' or
 +
'%B %-d, %-Y') ..
 +
'<span style="display:none">(%-Y-%m-%d)</span>'
 +
elseif date1.month then -- y, m known; d unknown
 +
result =
 +
'%B %-Y' ..
 +
'<span style="display:none">(%-Y-%m-00)</span>'
 +
else -- y known; m, d unknown
 +
result =
 +
'%-Y' ..
 +
'<span style="display:none">(%-Y-00-00)</span>'
 +
end
 +
result = from_en(date1:text(result) ..
 +
mtext['txt-aged'] ..
 +
dateDifference({
 +
diff = diff,
 +
show = 'y',
 +
abbr = 'abbr_off',
 +
disp = 'disp_raw',
 +
range = 'dash',
 +
sep = 'sep_space',
 +
}) ..
 +
')')
 +
local warnings = tonumber(frame.args.warnings)
 +
if warnings and warnings > 0 then
 +
local good = {
 +
df = true,
 +
mf = true,
 +
}
 +
local invalid
 +
local imax = options.textdates and 2 or 6
 +
for k, _ in pairs(args) do
 +
if type(k) == 'number' then
 +
if k > imax then
 +
invalid = tostring(k)
 +
break
 +
end
 +
else
 +
if not good[k] then
 +
invalid = k
 +
break
 +
end
 +
end
 +
end
 +
if invalid then
 +
result = result .. message({ 'mt-bad-param1', invalid }, 'warning')
 +
end
 +
end
 +
return result
 
end
 
end
  
−
local function error_wikitext(text)
+
local function dateToGsd(frame)
−
    -- Return message for display when template parameters are invalid.
+
-- Implement [[Template:Gregorian serial date]].
−
    local prefix = '[[Module talk:Age|Module error]]:'
+
-- Return Gregorian serial date of the given date, or the current date.
−
    local cat = '[[Category:Age error]]'
+
-- The returned value is negative for dates before 1 January 1 AD
−
    return '<span style="color:black; background-color:pink;">' ..
+
-- despite the fact that GSD is not defined for such dates.
−
            prefix .. ' ' .. text .. cat .. '</span>'
+
local date = getDates(frame, { wantMixture=true, single=true })
 +
if type(date) == 'string' then
 +
return date
 +
end
 +
return tostring(date.gsd)
 
end
 
end
  
−
local function age_days(frame)
+
local function jdToDate(frame)
−
    -- Return age in days between two given dates, or
+
-- Return formatted date from a Julian date.
−
    -- between given date and current date.
+
-- The result includes a time if the input includes a fraction.
−
    -- This code implements the logic in [[Template:Age in days]].
+
-- The word 'Julian' is accepted for the Julian calendar.
−
    -- Like {{Age in days}}, a missing argument is replaced from the current
+
local Date = getExports(frame)
−
    -- date, so can get a bizarre mixture of specified/current y/m/d.
+
local args = frame:getParent().args
−
    local args = frame:getParent().args
+
local date = Date('juliandate', args[1], args[2])
−
    local year1  = date_component(args.year1 , args[1], 'year' )
+
if date then
−
    local month1 = date_component(args.month1, args[2], 'month')
+
return from_en(date:text())
−
    local day1  = date_component(args.day1  , args[3], 'day'  )
+
end
−
    local year2  = date_component(args.year2 , args[4], 'year' )
+
return message('mt-need-jdn')
−
    local month2 = date_component(args.month2, args[5], 'month')
 
−
    local day2  = date_component(args.day2  , args[6], 'day'  )
 
−
    local gsd1 = gsd(year1, month1, day1)
 
−
    local gsd2 = gsd(year2, month2, day2)
 
−
    if gsd1 and gsd2 then
 
−
        local sign = ''
 
−
        local result = gsd2 - gsd1
 
−
        if result < 0 then
 
−
            sign = MINUS
 
−
            result = -result
 
−
        end
 
−
        return sign .. tostring(result)
 
−
    end
 
−
    return error_wikitext('Cannot handle dates before the year 1 AD')
 
 
end
 
end
  
−
local function age_ym(frame)
+
local function dateToJd(frame)
−
    -- Return age in years and months between two given dates, or
+
-- Return Julian date (a number) from a date which may include a time,
−
    -- between given date and current date.
+
-- or the current date ('currentdate') or current date and time ('currentdatetime').
−
    local args = frame:getParent().args
+
-- The word 'Julian' is accepted for the Julian calendar.
−
    local fields = {}
+
local Date = getExports(frame)
−
    for i = 1, 6 do
+
local args = frame:getParent().args
−
        fields[i] = strip_to_nil(args[i])
+
local date = Date(args[1], args[2], args[3], args[4], args[5], args[6], args[7])
−
    end
+
if date then
−
    local date1, date2
+
return tostring(date.jd)
−
    if fields[1] and fields[2] and fields[3] then
+
end
−
        date1 = Date:new():set_ymd(fields[1], fields[2], fields[3])
+
return message('mt-need-valid-ymd-current')
−
    end
 
−
    if not (date1 and date1.isvalid) then
 
−
        return error_wikitext('Need date: year, month, day')
 
−
    end
 
−
    if fields[4] and fields[5] and fields[6] then
 
−
        date2 = Date:new():set_ymd(fields[4], fields[5], fields[6])
 
−
        if not date2.isvalid then
 
−
            return error_wikitext('Second date should be year, month, day')
 
−
        end
 
−
    else
 
−
        date2 = Date:new():set_current()
 
−
    end
 
−
    return DateDiff:new():set(date1, date2):age_ym()
 
 
end
 
end
  
−
local function gsd_ymd(frame)
+
local function timeInterval(frame)
−
    -- Return Gregorian serial day of the given date, or the current date.
+
-- Implement [[Template:Time interval]].
−
    -- Like {{Gregorian serial date}}, a missing argument is replaced from the
+
-- There are two positional arguments: date1, date2.
−
    -- current date, so can get a bizarre mixture of specified/current y/m/d.
+
-- The default for each is the current date and time.
−
    -- This accepts positional arguments, although the original template does not.
+
-- Result is date2 - date1 formatted.
−
    local args = frame:getParent().args
+
local Date = getExports(frame)
−
    local year  = date_component(args.year , args[1], 'year' )
+
local args = frame:getParent().args
−
    local month = date_component(args.month, args[2], 'month')
+
local parms = {
−
    local day  = date_component(args.day  , args[3], 'day' )
+
extra = makeExtra(args),
−
    local result = gsd(year, month, day)
+
wantDuration = yes(args.duration),
−
    if result then
+
range = yes(args.range) or (args.range == 'dash' and 'dash' or nil),
−
        return tostring(result)
+
wantSc = yes(args.sc),
−
    end
+
}
−
    return error_wikitext('Cannot handle dates before the year 1 AD')
+
local fix = yes(args.fix) and 'fix' or ''
 +
local date1 = Date(fix, 'partial', stripToNil(args[1]) or 'currentdatetime')
 +
if not date1 then
 +
return message('mt-invalid-start')
 +
end
 +
local date2 = Date(fix, 'partial', stripToNil(args[2]) or 'currentdatetime')
 +
if not date2 then
 +
return message('mt-invalid-end')
 +
end
 +
parms.diff = date2 - date1
 +
for argname, translate in pairs(translateParameters) do
 +
local parm = stripToNil(args[argname])
 +
if parm then
 +
parm = translate[parm]
 +
if parm == nil then  -- test for nil because false is a valid setting
 +
return message({ 'mt-bad-param2', argname, args[argname] })
 +
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({ 'mt-conflicting-show', args.show, args.round })
 +
end
 +
else
 +
parms.show = translateParameters.show[round]
 +
end
 +
end
 +
parms.round = true
 +
end
 +
return from_en(dateDifference(parms))
 
end
 
end
  
−
return { age_days = age_days, age_ym = age_ym, gsd = gsd_ymd }
+
return {
 +
age_generic = ageGeneric,           -- can emulate several age templates
 +
birth_date_and_age = bda,           -- Template:Birth_date_and_age
 +
death_date_and_age = dda,          -- Template:Death_date_and_age
 +
gsd = dateToGsd,                    -- Template:Gregorian_serial_date
 +
extract = dateExtract,              -- Template:Extract
 +
jd_to_date = jdToDate,              -- Template:?
 +
JULIANDAY = dateToJd,              -- Template:JULIANDAY
 +
time_interval = timeInterval,      -- Template:Time_interval
 +
}

Latest revision as of 11:05, 29 February 2020

Documentation for this module may be created at Module:Age/doc 

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

local mtext = {
	-- Message and other text that should be localized.
	['mt-bad-param1'] =             'Invalid parameter $1',
	['mt-bad-param2'] =             'Parameter $1=$2 is invalid',
	['mt-bad-show'] =               'Parameter show=$1 is not supported here',
	['mt-cannot-add'] =             'Cannot add "$1"',
	['mt-conflicting-show'] =       'Parameter show=$1 conflicts with round=$2',
	['mt-date-wrong-order'] =       'The second date must be later in time than the first date',
	['mt-dd-future'] =              'Death date (first date) must not be in the future',
	['mt-dd-wrong-order'] =         'Death date (first date) must be later in time than the birth date (second date)',
	['mt-invalid-bd-age'] =         'Invalid birth date for calculating age',
	['mt-invalid-dates-age'] =      'Invalid dates for calculating age',
	['mt-invalid-end'] =            'Invalid end date in second parameter',
	['mt-invalid-start'] =          'Invalid start date in first parameter',
	['mt-need-jdn'] =               'Need valid Julian date number',
	['mt-need-valid-bd'] =          'Need valid birth date: year, month, day',
	['mt-need-valid-bd2'] =         'Need valid birth date (second date): year, month, day',
	['mt-need-valid-date'] =        'Need valid date',
	['mt-need-valid-dd'] =          'Need valid death date (first date): year, month, day',
	['mt-need-valid-ymd'] =         'Need valid year, month, day',
	['mt-need-valid-ymd-current'] = 'Need valid year|month|day or "currentdate"',
	['mt-need-valid-ymd2'] =        'Second date should be year, month, day',
	['mt-template-bad-name'] =      'The specified template name is not valid',
	['mt-template-x'] =             'The template invoking this must have "|template=x" where x is the wanted operation',
	['txt-age'] =                   '(age&nbsp;',
	['txt-aged'] =                  ' (aged&nbsp;',
	['txt-and'] =                   ' and ',
	['txt-comma-and'] =             ', and ',
	['txt-error'] =                 'Error: ',
	['txt-or'] =                    '&nbsp;or ',
}

local translate, from_en, to_en, isZero
if translate then
	-- Functions to translate from en to local language and reverse go here.
	-- See example at [[:bn:Module:বয়স]].
else
	from_en = function (text)
		return text
	end
	isZero = function (text)
		return tonumber(text) == 0
	end
end

local _Date, _currentDate
local function getExports(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)
		local realDate = datemod._Date
		_currentDate = datemod._current
		if to_en then
			_Date = function (...)
				local args = {}
				for i, v in ipairs({...}) do
					args[i] = to_en(v)
				end
				return realDate(unpack(args))
			end
		else
			_Date = realDate
		end
	end
	return _Date, _currentDate
end

local Collection  -- a table to hold items
Collection = {
	add = function (self, item)
		if item ~= nil then
			self.n = self.n + 1
			self[self.n] = item
		end
	end,
	join = function (self, sep)
		return table.concat(self, sep)
	end,
	remove = function (self, pos)
		if self.n > 0 and (pos == nil or (0 < pos and pos <= self.n)) then
			self.n = self.n - 1
			return table.remove(self, pos)
		end
	end,
	sort = function (self, comp)
		table.sort(self, comp)
	end,
	new = function ()
		return setmetatable({n = 0}, Collection)
	end
}
Collection.__index = Collection

local function stripToNil(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, id)
	-- Return formatted message text for an error or warning.
	local function getText(msg)
		return mtext[msg] or error('Bug: message "' .. tostring(msg) .. '" not defined')
	end
	local text
	if type(msg) == 'table' then
		text = getText(msg[1])
		local rep = {}
		for i, v in ipairs(msg) do
			if i > 1 then
				rep['$' .. (i - 1)] = v
			end
		end
		text = text:gsub('$%d+', rep)
	else
		text = getText(msg)
	end
	local categories = {
		error = '[[Category:Age error]]',
		warning = '[[Category:Age error]]',  -- same as error until determine whether 'Age warning' would be worthwhile
	}
	local a, b, category
	if id == 'warning' then
		a = '<sup>[<i>'
		b = '</i>]</sup>'
	else
		a = '<strong class="error">' .. getText('txt-error')
		b = '</strong>'
	end
	if mw.title.getCurrentTitle():inNamespaces(0) then
		-- Category only in namespaces: 0=article.
		category = categories[id or 'error']
	end
	return
		a ..
		mw.text.nowiki(text) ..
		b ..
		(category or '')
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.new()
	local pos = 0
	repeat
		places:add(pos)
		pos = pos + 3
	until pos >= length
	places:add(length)
	local groups = Collection.new()
	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 spellNumber(number, options, i)
	-- Return result of spelling number, or
	-- return number (as a string) if cannot spell it.
	-- i == 1 for the first number which can optionally start with an uppercase letter.
	number = tostring(number)
	return require('Module:ConvertNumeric').spell_number(
		number,
		nil,                       -- fraction numerator
		nil,                       -- fraction denominator
		i == 1 and options.upper,  -- true: 'One' instead of 'one'
		not options.us,            -- true: use 'and' between tens/ones etc
		options.adj,               -- true: hyphenated
		options.ordinal            -- true: 'first' instead of 'one'
	) or number
end

local function makeExtra(args, flagCurrent)
	-- Return extra text that will be inserted before the visible result
	-- but after any sort key.
	local extra = args.prefix or ''
	if mw.ustring.len(extra) > 1 then
		-- Parameter "~" gives "~3" whereas "over" gives "over 3".
		if extra:sub(-6, -1) ~= '&nbsp;' then
			extra = extra .. ' '
		end
	end
	if flagCurrent then
		extra = '<span class="currentage"></span>' .. extra
	end
	return extra
end

local function makeSort(value, sortable)
	-- Return a sort key if requested.
	-- Assume value is a valid number which has not overflowed.
	if sortable == 'sortable_table' or 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)
			if value > 0 then
				sortKey = 7000 + mag
			else
				sortKey = 2999 - mag
				value = value + 10^(mag+1)
			end
			sortKey = string.format('%d', sortKey) .. string.format('%015.0f', math.floor(value * 10^(14-mag)))
		end
		local result
		if sortable == 'sortable_table' then
			result = 'data-sort-value="_SORTKEY_"|'
		elseif sortable == 'sortable_debug' then
			result = '<span data-sort-value="_SORTKEY_♠"><span style="border:1px solid">_SORTKEY_♠</span></span>'
		else
			result = '<span data-sort-value="_SORTKEY_♠"></span>'
		end
		return result:gsub('_SORTKEY_', sortKey)
	end
end

local translateParameters = {
	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' },
		h = { 'H', id = 'h' },
		hm = { 'H', 'M', id = 'hm' },
		hms = { 'H', 'M', 'S', id = 'hms' },
		d = { 'd', id = 'd' },
		dh = { 'd', 'H', id = 'dh' },
		dhm = { 'd', 'H', 'M', id = 'dhm' },
		dhms = { 'd', 'H', 'M', 'S', id = 'dhms' },
		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',
		table = 'sortable_table',
		debug = 'sortable_debug',
	},
}

local spellOptions = {
	cardinal = {},
	Cardinal = { upper = true },
	cardinal_us = { us = true },
	Cardinal_us = { us = true, upper = true },
	ordinal = { ordinal = true },
	Ordinal = { ordinal = true, upper = true },
	ordinal_us = { ordinal = true, us = true },
	Ordinal_us = { ordinal = true, us = true, upper = true },
}

local function dateExtract(frame)
	-- Return part of a date after performing an optional operation.
	local Date = getExports(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 show = stripToNil(args.show) or 'dmy'
	local date = Date(unpack(parms))
	if not date then
		if show == 'format' then
			return 'error'
		end
		return message('mt-need-valid-date')
	end
	local add = stripToNil(args.add)
	if add then
		for item in add:gmatch('%S+') do
			date = date + item
			if not date then
				return message({ 'mt-cannot-add', item })
			end
		end
	end
	local sortKey, result
	local sortable = translateParameters.sortable[args.sortable]
	if sortable then
		local value = (date.partial and date.partial.first or date).jdz
		sortKey = makeSort(value, sortable)
	end
	if show ~= 'hide' then
		result = date[show]
		if result == nil then
			result = from_en(date:text(show))
		elseif type(result) == 'boolean' then
			result = result and '1' or '0'
		else
			result = from_en(tostring(result))
		end
	end
	return (sortKey or '') .. makeExtra(args) .. (result or '')
end

local function rangeJoin(range)
	-- Return text to be used between a range of ages.
	return range == 'dash' and '–' or mtext['txt-or']
end

local function makeText(values, components, names, options, noUpper)
	-- Return wikitext representing an age or duration.
	local text = Collection.new()
	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 options.spell then
				fmt = function(number)
					return spellNumber(number, options.spell, noUpper or i)
				end
			elseif 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
				vstr = fmt(v[1]) .. rangeJoin(options.range)
				noUpper = true
				vstr = vstr .. 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 = mtext['txt-comma-and']
	else
		first = ', '
		last = mtext['txt-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.sortKey or '') ..
		(options.extra or '') ..
		sign ..
		text:join() ..
		(options.suffix or '')
end

local function dateDifference(parms)
	-- Return a formatted date difference using the given parameters
	-- which have been validated.
	local names = {
		abbr_off = {
			plural = 's',
			sep = '&nbsp;',
			y = 'year',
			m = 'month',
			w = 'week',
			d = 'day',
			H = 'hour',
			M = 'minute',
			S = 'second',
		},
		abbr_on = {
			y = 'y',
			m = 'm',
			w = 'w',
			d = 'd',
			H = 'h',
			M = 'm',
			S = 's',
		},
		abbr_infant = {      -- for {{age for infant}}
			plural = 's',
			sep = '&nbsp;',
			y = 'yr',
			m = 'mo',
			w = 'wk',
			d = 'day',
			H = 'hr',
			M = 'min',
			S = 'sec',
		},
		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 defaultJoin
	if abbr ~= 'abbr_off' then
		defaultJoin = 'sep_space'
	end
	if not show then
		show = 'ymd'
		if parms.disp == 'disp_age' then
			if diff.years < 3 then
				defaultJoin = '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 = translateParameters.show[show]
	end
	if parms.disp == 'disp_raw' then
		defaultJoin = 'sep_space'
		abbr = 'abbr_raw'
	elseif parms.wantSc then
		defaultJoin = 'sep_serialcomma'
	end
	local diffOptions = {
		round = parms.round,
		duration = parms.wantDuration,
		range = parms.range and true or nil,
	}
	local sortKey
	if parms.sortable then
		local value = diff.age_days + (parms.wantDuration and 1 or 0)  -- days and fraction of a day
		if diff.isnegative then
			value = -value
		end
		sortKey = makeSort(value, parms.sortable)
	end
	local textOptions = {
		extra = parms.extra,
		format = parms.format,
		join = parms.sep or defaultJoin,
		isnegative = diff.isnegative,
		range = parms.range,
		sortKey = sortKey,
		spell = parms.spell,
		suffix = parms.suffix,  -- not currently used
	}
	if show.id == 'hide' then
		return sortKey or ''
	end
	local values = { diff:age(show.id, diffOptions) }
	if values[1] then
		return makeText(values, show, names[abbr], textOptions)
	end
	if diff.partial then
		-- Handle a more complex range such as
		-- {{age_yd|20 Dec 2001|2003|range=yes}} → 1 year, 12 days or 2 years, 11 days
		local opt = {
			format = textOptions.format,
			join = textOptions.join,
			isnegative = textOptions.isnegative,
			spell = textOptions.spell,
		}
		return
			(textOptions.sortKey or '') ..
			makeText({ diff.partial.mindiff:age(show.id, diffOptions) }, show, names[abbr], opt) ..
			rangeJoin(textOptions.range) ..
			makeText({ diff.partial.maxdiff:age(show.id, diffOptions) }, show, names[abbr], opt, true) ..
			(textOptions.suffix or '')
	end
	return message({ 'mt-bad-show', show.id })
end

local function getDates(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 optionally replaced with the current date.
	-- If wantMixture 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, currentDate = getExports(frame)
	getopt = getopt or {}
	local function flagCurrent(text)
		-- This allows the calling template to detect if the current date has been used,
		-- that is, whether both dates have been entered in a template expecting two.
		-- For example, an infobox may want the age when an event occurred, not the current age.
		-- Don't bother detecting if wantMixture is used because not needed and it is a poor option.
		if not text then
			if getopt.noMissing then
				return nil  -- this gives a nil date which gives an error
			end
			text = 'currentdate'
			if getopt.flag == 'usesCurrent' then
				getopt.usesCurrent = true
			end
		end
		return text
	end
	local args = frame:getParent().args
	local fields = {}
	local isNamed = 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 isNamed 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] = stripToNil(fields[i])
		if fields[i] then
			imax = i
		end
		if getopt.omitZero and i % 3 ~= 1 then  -- omit zero months and days as unknown values but keep year 0 which is 1 BCE
			if isZero(fields[i]) then
				fields[i] = nil
				getopt.partial = true
			end
		end
	end
	local fix = getopt.fix and 'fix' or ''
	local partialText = getopt.partial and 'partial' or ''
	local dates = {}
	if isNamed or imax >= 3 then
		local nrDates = getopt.single and 1 or 2
		if getopt.wantMixture then
			-- Cannot be partial since empty fields are set from current.
			local components = { 'year', 'month', 'day' }
			for i = 1, nrDates * 3 do
				fields[i] = fields[i] or currentDate[components[i > 3 and i - 3 or i]]
			end
			for i = 1, nrDates do
				local index = i == 1 and 1 or 4
				local y, m, d = fields[index], fields[index+1], fields[index+2]
				if (m == 2 or m == '2') and (d == 29 or d == '29') then
					-- Workaround error with following which attempt to use invalid date 2001-02-29.
					-- {{age_ymwd|year1=2001|year2=2004|month2=2|day2=29}}
					-- {{age_ymwd|year1=2001|month1=2|year2=2004|month2=1|day2=29}}
					-- TODO Get rid of wantMixture because even this ugly code does not handle
					-- 'Feb' or 'February' or 'feb' or 'february'.
					if not ((y % 4 == 0 and y % 100 ~= 0) or y % 400 == 0) then
						d = 28
					end
				end
				dates[i] = Date(y, m, d)
			end
		else
			-- If partial dates are allowed, accept
			--     year only, or
			--     year and month only
			-- Do not accept year and day without a month because that makes no sense
			-- (and because, for example, Date('partial', 2001, nil, 12) sets day = nil, not 12).
			for i = 1, nrDates do
				local index = i == 1 and 1 or 4
				local y, m, d = fields[index], fields[index+1], fields[index+2]
				if (getopt.partial and y and (m or not d)) or (y and m and d) then
					dates[i] = Date(fix, partialText, y, m, d)
				elseif not y and not m and not d then
					dates[i] = Date(flagCurrent())
				end
			end
		end
	else
		getopt.textdates = true  -- have parsed each date from a single text field
		dates[1] = Date(fix, partialText, flagCurrent(fields[1]))
		if not getopt.single then
			dates[2] = Date(fix, partialText, flagCurrent(fields[2]))
		end
	end
	if not dates[1] then
		return message(getopt.missing1 or 'mt-need-valid-ymd')
	end
	if getopt.single then
		return dates[1]
	end
	if not dates[2] then
		return message(getopt.missing2 or 'mt-need-valid-ymd2')
	end
	return dates[1], dates[2]
end

local function ageGeneric(frame)
	-- Return the result required by the specified template.
	-- Can use sortable=x where x = on/table/off/debug in any supported template.
	-- Some templates default to sortable=on but can be overridden.
	local name = frame.args.template
	if not name then
		return message('mt-template-x')
	end
	local args = frame:getParent().args
	local specs = {
		age_days = {                -- {{age in days}}
			show = 'd',
			disp = 'disp_raw',
		},
		age_days_nts = {            -- {{age in days nts}}
			show = 'd',
			disp = 'disp_raw',
			format = 'format_commas',
			sortable = 'on',
		},
		duration_days = {           -- {{duration in days}}
			show = 'd',
			disp = 'disp_raw',
			duration = true,
		},
		duration_days_nts = {       -- {{duration in days nts}}
			show = 'd',
			disp = 'disp_raw',
			format = 'format_commas',
			sortable = 'on',
			duration = true,
		},
		age_full_years = {          -- {{age}}
			show = 'y',
			abbr = 'abbr_raw',
			flag = 'usesCurrent',
			omitZero = true,
			range = 'no',
		},
		age_full_years_nts = {      -- {{age nts}}
			show = 'y',
			abbr = 'abbr_raw',
			format = 'format_commas',
			sortable = 'on',
		},
		age_in_years = {            -- {{age in years}}
			show = 'y',
			abbr = 'abbr_raw',
			negative = 'error',
			range = 'dash',
		},
		age_in_years_nts = {        -- {{age in years nts}}
			show = 'y',
			abbr = 'abbr_raw',
			negative = 'error',
			range = 'dash',
			format = 'format_commas',
			sortable = 'on',
		},
		age_infant = {              -- {{age for 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 = {                   -- {{age in months}}
			show = 'm',
			disp = 'disp_raw',
		},
		age_w = {                   -- {{age in weeks}}
			show = 'w',
			disp = 'disp_raw',
		},
		age_wd = {                  -- {{age in weeks and days}}
			show = 'wd',
		},
		age_yd = {                  -- {{age in years and days}}
			show = 'yd',
			format = 'format_commas',
			sep = args.sep ~= 'and' and 'sep_comma' or nil,
		},
		age_yd_nts = {              -- {{age in years and days nts}}
			show = 'yd',
			format = 'format_commas',
			sep = args.sep ~= 'and' and 'sep_comma' or nil,
			sortable = 'on',
		},
		age_ym = {                  -- {{age in years and months}}
			show = 'ym',
			sep = 'sep_comma',
		},
		age_ymd = {                 -- {{age in years, months and days}}
			show = 'ymd',
			range = true,
		},
		age_ymwd = {                -- {{age in years, months, weeks and days}}
			show = 'ymwd',
			wantMixture = true,
		},
	}
	local spec = specs[name]
	if not spec then
		return message('mt-template-bad-name')
	end
	if name == 'age_days' then
		local su = stripToNil(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 partial, autofill
	local range = stripToNil(args.range) or spec.range
	if range then
		-- Suppose partial dates are used and age could be 11 or 12 years.
		-- "|range=" (empty value) has no effect (spec is used).
		-- "|range=yes" or spec.range == true sets range = true (gives "11 or 12")
		-- "|range=dash" or spec.range == 'dash' sets range = 'dash' (gives "11–12").
		-- "|range=no" or spec.range == 'no' sets range = nil and fills each date in the diff (gives "12").
		--     ("on" is equivalent to "yes", and "off" is equivalent to "no").
		-- "|range=OTHER" sets range = nil and rejects partial dates.
		range = ({ dash = 'dash', off = 'no', no = 'no', [true] = true })[range] or yes(range)
		if range then
			partial = true  -- accept partial dates with a possible age range for the result
			if range == 'no' then
				autofill = true  -- missing month/day in first or second date are filled from other date or 1
				range = nil
			end
		end
	end
	local getopt = {
		fix = yes(args.fix),
		flag = stripToNil(args.flag) or spec.flag,
		omitZero = spec.omitZero,
		partial = partial,
		wantMixture = spec.wantMixture,
	}
	local date1, date2 = getDates(frame, getopt)
	if type(date1) == 'string' then
		return date1
	end
	local format = stripToNil(args.format)
	local spell = spellOptions[format]
	if format then
		format = 'format_' .. format
	elseif name == 'age_days' and getopt.textdates then
		format = 'format_commas'
	end
	local parms = {
		diff = date2:subtract(date1, { fill = autofill }),
		wantDuration = spec.duration or yes(args.duration),
		range = range,
		wantSc = yes(args.sc),
		show = args.show == 'hide' and 'hide' or spec.show,
		abbr = spec.abbr,
		disp = spec.disp,
		extra = makeExtra(args, getopt.usesCurrent and format ~= 'format_raw'),
		format = format or spec.format,
		round = yes(args.round),
		sep = spec.sep,
		sortable = translateParameters.sortable[args.sortable or spec.sortable],
		spell = spell,
	}
	if (spec.negative or frame.args.negative) == 'error' and parms.diff.isnegative then
		return message('mt-date-wrong-order')
	end
	return from_en(dateDifference(parms))
end

local function bda(frame)
	-- Implement [[Template:Birth date and age]].
	local args = frame:getParent().args
	local options = {
		missing1 = 'mt-need-valid-bd',
		noMissing = true,
		single = true,
	}
	local date = getDates(frame, options)
	if type(date) == 'string' then
		return date  -- error text
	end
	local Date = getExports(frame)
	local diff = Date('currentdate') - date
	if diff.isnegative or diff.years > 150 then
		return message('mt-invalid-bd-age')
	end
	local disp, show = 'disp_raw', 'y'
	if diff.years < 2 then
		disp = 'disp_age'
		if diff.years == 0 and diff.months == 0 then
			show = 'd'
		else
			show = 'm'
		end
	end
	local df = stripToNil(args.df)  -- day first (dmy); default is month first (mdy)
	local result = '(<span class="bday">%-Y-%m-%d</span>) </span>' ..
					(df and '%-d %B %-Y' or '%B %-d, %-Y')
	result = from_en('<span style="display:none"> ' ..
		date:text(result) ..
		'<span class="noprint ForceAgeToShow"> ' ..
		mtext['txt-age'] ..
		dateDifference({
			diff = diff,
			show = show,
			abbr = 'abbr_off',
			disp = disp,
			sep = 'sep_space',
		}) ..
		')</span>')
	local warnings = tonumber(frame.args.warnings)
	if warnings and warnings > 0 then
		local good = {
			df = true,
			mf = true,
			day = true,
			day1 = true,
			month = true,
			month1 = true,
			year = true,
			year1 = true,
		}
		local invalid
		local imax = options.textdates and 1 or 3
		for k, _ in pairs(args) do
			if type(k) == 'number' then
				if k > imax then
					invalid = tostring(k)
					break
				end
			else
				if not good[k] then
					invalid = k
					break
				end
			end
		end
		if invalid then
			result = result .. message({ 'mt-bad-param1', invalid }, 'warning')
		end
	end
	return result
end

local function dda(frame)
	-- Implement [[Template:Death date and age]].
	local args = frame:getParent().args
	local options = {
		missing1 = 'mt-need-valid-dd',
		missing2 = 'mt-need-valid-bd2',
		noMissing = true,
		partial = true,
	}
	local date1, date2 = getDates(frame, options)
	if type(date1) == 'string' then
		return date1
	end
	local diff = date1 - date2
	if diff.isnegative then
		return message('mt-dd-wrong-order')
	end
	local Date = getExports(frame)
	local today = Date('currentdate') + 1  -- one day in future allows for timezones
	if date1 > today then
		return message('mt-dd-future')
	end
	local years
	if diff.partial then
		years = diff.partial.years
		years = type(years) == 'table' and years[2] or years
	else
		years = diff.years
	end
	if years > 150 then
		return message('mt-invalid-dates-age')
	end
	local df = stripToNil(args.df)  -- day first (dmy); default is month first (mdy)
	local result
	if date1.day then  -- y, m, d known
		result = (df and
			'%-d %B %-Y' or
			'%B %-d, %-Y') ..
			'<span style="display:none">(%-Y-%m-%d)</span>'
	elseif date1.month then  -- y, m known; d unknown
		result =
			'%B %-Y' ..
			'<span style="display:none">(%-Y-%m-00)</span>'
	else  -- y known; m, d unknown
		result =
			'%-Y' ..
			'<span style="display:none">(%-Y-00-00)</span>'
	end
	result = from_en(date1:text(result) ..
		mtext['txt-aged'] ..
		dateDifference({
			diff = diff,
			show = 'y',
			abbr = 'abbr_off',
			disp = 'disp_raw',
			range = 'dash',
			sep = 'sep_space',
		}) ..
		')')
	local warnings = tonumber(frame.args.warnings)
	if warnings and warnings > 0 then
		local good = {
			df = true,
			mf = true,
		}
		local invalid
		local imax = options.textdates and 2 or 6
		for k, _ in pairs(args) do
			if type(k) == 'number' then
				if k > imax then
					invalid = tostring(k)
					break
				end
			else
				if not good[k] then
					invalid = k
					break
				end
			end
		end
		if invalid then
			result = result .. message({ 'mt-bad-param1', invalid }, 'warning')
		end
	end
	return result
end

local function dateToGsd(frame)
	-- Implement [[Template:Gregorian serial date]].
	-- 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 = getDates(frame, { wantMixture=true, single=true })
	if type(date) == 'string' then
		return date
	end
	return tostring(date.gsd)
end

local function jdToDate(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 = getExports(frame)
	local args = frame:getParent().args
	local date = Date('juliandate', args[1], args[2])
	if date then
		return from_en(date:text())
	end
	return message('mt-need-jdn')
end

local function dateToJd(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 = getExports(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('mt-need-valid-ymd-current')
end

local function timeInterval(frame)
	-- Implement [[Template:Time interval]].
	-- There are two positional arguments: date1, date2.
	-- The default for each is the current date and time.
	-- Result is date2 - date1 formatted.
	local Date = getExports(frame)
	local args = frame:getParent().args
	local parms = {
		extra = makeExtra(args),
		wantDuration = yes(args.duration),
		range = yes(args.range) or (args.range == 'dash' and 'dash' or nil),
		wantSc = yes(args.sc),
	}
	local fix = yes(args.fix) and 'fix' or ''
	local date1 = Date(fix, 'partial', stripToNil(args[1]) or 'currentdatetime')
	if not date1 then
		return message('mt-invalid-start')
	end
	local date2 = Date(fix, 'partial', stripToNil(args[2]) or 'currentdatetime')
	if not date2 then
		return message('mt-invalid-end')
	end
	parms.diff = date2 - date1
	for argname, translate in pairs(translateParameters) do
		local parm = stripToNil(args[argname])
		if parm then
			parm = translate[parm]
			if parm == nil then  -- test for nil because false is a valid setting
				return message({ 'mt-bad-param2', argname, args[argname] })
			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({ 'mt-conflicting-show', args.show, args.round })
				end
			else
				parms.show = translateParameters.show[round]
			end
		end
		parms.round = true
	end
	return from_en(dateDifference(parms))
end

return {
	age_generic = ageGeneric,           -- can emulate several age templates
	birth_date_and_age = bda,           -- Template:Birth_date_and_age
	death_date_and_age = dda,           -- Template:Death_date_and_age
	gsd = dateToGsd,                    -- Template:Gregorian_serial_date
	extract = dateExtract,              -- Template:Extract
	jd_to_date = jdToDate,              -- Template:?
	JULIANDAY = dateToJd,               -- Template:JULIANDAY
	time_interval = timeInterval,       -- Template:Time_interval
}
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