Module:Age
Documentation for this module may be created at Module:Age/doc
-- 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 = '<span id="FormattingError" />'
local category
if not nocat and mw.title.getCurrentTitle():inNamespaces(0, 10) then
-- Category only in namespaces: 0=article, 10=template.
category = '[[Category:Age error]]'
else
category = ''
end
return anchor ..
'<strong class="error">Error: ' ..
mw.text.nowiki(msg) ..
'</strong>' ..
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
'<span style="border:1px solid;display:inline;" class="sortkey">' or
'<span style="display:none" class="sortkey">'
return lhs .. sortkey .. '♠</span>'
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 {{age for infant}}
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 = { -- {{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',
},
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',
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',
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 {{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 = 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 {{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 = 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
}