-- Implement various "age of" and other date-related templates.  
local mtext = {
-- Message and other text that should be localized.
-- Also need to localize text in table names in function dateDifference.
['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-and'] = ' and ',
['txt-or'] = '&nbsp;or ',
['txt-category'] = 'Category:Age error',
['txt-comma-and'] = ', and ',
['txt-error'] = 'Error: ',
['txt-format-default'] = 'mf', -- 'df' (day first = dmy) or 'mf' (month first = mdy)
['txt-module-convertnumeric'] = 'Module:ConvertNumeric',
['txt-module-date'] = 'Module:Date',
['txt-sandbox'] = 'sandbox',
['txt-bda'] = '<span> (<span>$1</span>) </span>$2<span> (age&nbsp;$3)</span>',
['txt-dda'] = '$2<span>($1)</span> (aged&nbsp;$3)',
['txt-bda-disp'] = 'disp_raw', -- disp_raw → age is a number only; disp_age → age is a number and unit (normally years but months or days if very young)
['txt-dda-disp'] = 'disp_raw',
['txt-dmy'] = '%-d %B %-Y',
['txt-mdy'] = '%B %-d, %-Y',
}  
local isWarning = {
['mt-bad-param1'] = true,
}  
local translate, from_en, to_en, isZero
if translate then
-- Functions to translate from en to local language and reverse go here.
-- See example at :bn:Module:বয়স.
else
from_en = function (text)
return text
end
isZero = function (text)
return tonumber(text) == 0
end
end  
local _Date, _currentDate
local function getExports
-- Return objects exported from the date module or its sandbox.
if not _Date then
local sandbox = :getTitle:find(mtext['txt-sandbox'], 1, true) and ('/' .. mtext['txt-sandbox']) or ''
local datemod = require(mtext['txt-module-date'] .. sandbox)
local realDate = datemod._Date
_currentDate = datemod._current
if to_en then
_Date = function (...)
local args = {}
for i, v in ipairs({...}) do
args[i] = to_en(v)
end
return realDate(unpack(args))
end
else
_Date = realDate
end
end
return _Date, _currentDate
end  
local Collection -- a table to hold items
Collection = {
add = function (self, item)
if item ~= nil then
self.n = self.n + 1
self[self.n] = item
end
end,
join = function (self, sep)
return table.concat(self, sep)
end,
remove = function (self, pos)
if self.n > 0 and (pos == nil or (0 < pos and pos <= self.n)) then
self.n = self.n - 1
return table.remove(self, pos)
end
end,
sort = function (self, comp)
table.sort(self, comp)
end,
new = function
return setmetatable({n = 0}, Collection)
end
}
Collection.__index = Collection  
local function stripToNil(text)
-- If text is a string, return its trimmed content, or nil if empty.
-- Otherwise return text (which may, for example, be nil).
if type(text) == 'string' then
text = text:match('(%S.-)%s*$')
end
return text
end  
local function dateFormat(args)
-- Return string for wanted date format.
local default = mtext['txt-format-default']
local other = default == 'df' and 'mf' or 'df'
local wanted = stripToNil(args[other]) and other or default
return wanted == 'df' and mtext['txt-dmy'] or mtext['txt-mdy']
end  
local function substituteParameters(text, ...)
-- Return text after substituting any given parameters for $1, $2, etc.
return mw.message.newRawMessage(text, ...):plain
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, ...)
-- 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 categories = {
error = mtext['txt-category'],
warning = mtext['txt-category'],
}
local a, b, k, category
local text = substituteParameters(getText(msg), ...)
if isWarning[msg] then
a = '<sup>[<i>'
b = '</i>]</sup>'
k = 'warning'
else
a = '<strong>' .. getText('txt-error')
b = '</strong>'
k = 'error'
end
if mw.title.getCurrentTitle:inNamespaces(0) then
-- Category only in namespaces: 0=article.
category = '[[' .. categories[k] .. ']]'
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(mtext['txt-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></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>_SORTKEY_♠</span></span>'
else
result = '<span data-sort-value="_SORTKEY_♠"></span>'
end
return (result:gsub('_SORTKEY_', sortKey))
end
end  
local translateParameters = {
abbr = {