-- This module powers {{countdown-ymd}}.
require('strict')
local p = {}
local static_text = {
['eventtime'] = 'Time to event:',
['begins'] = 'Event begins in', -- when |duration= is set
['ends'] = 'Event ends in', -- when |duration= is set
['ended'] = 'Event has ended.', -- when |duration= is set
['passed'] = 'Event time has passed.',
['invalid'] = '<span style="font-size:100%" class="error">Error: invalid date and/or time</span>',
}
local getArgs = require('Module:Arguments').getArgs
--[[--------------------------< F O R M A T _ U N I T >--------------------------------------------------------
Concatenates a singular or plural label to a time/date unit: unit label or unit labels. If unit is 0 or less, returns nil
]]
local function format_unit (unit, label)
if 1 > unit then -- less than one so don't display
return nil; -- return nil so the result of this call isn't stuffed into results table by table.insert
elseif 1 == unit then
return unit .. ' ' .. label; -- only one unit so return singular label
else
return unit .. ' ' .. label .. 's'; -- multiple units so return plural label
end
end
--[[--------------------------< D U R A T I O N >--------------------------------------------------------------
Returns duration of event in seconds. If the units are not defined, assumes seconds. If the units are
defined but not one of day, days, hour, hours, minute, minutes, second, seconds then returns zero.
|duration=<number><space><unit>
TODO: Why are we even considering seconds and minutes? Would it be better to specify and end time?
]]
local function duration (duration)
local number, unit = duration:match ('(%d+)%s+(%a*)');
if not number then
return 0; -- duration not properly specified
elseif not unit then
return number; -- unit not defined, assume seconds
end
if unit:match ('days?') then
return number * 86400;
elseif unit:match ('hours?') then
return number * 3600;
elseif unit:match ('minutes?') then
return number * 60;
elseif unit:match ('seconds?') then
return number;
else
return 0; -- unknown unit
end
end
--[[--------------------------< U T C _ O F F S E T >----------------------------------------------------------
Returns offset from UTC in seconds. If 'utc offset' parameter is out of range or malformed, returns 0.
TODO: Return a success/fail flag so we can emit an error message?
]]
local function utc_offset (offset)
local sign, utc_offset_hr, utc_offset_min;
if offset:match('^[%+%-]%d%d:%d%d$') then -- formal style: sign, hours colon minutes all required
sign, utc_offset_hr, utc_offset_min = offset:match('^([%+%-])(%d%d):(%d%d)$');
elseif offset:match('^[%+%-]?%d?%d:?%d%d$') then -- informal: sign and colon optional, 1- or 2-digit hours, and minutes
sign, utc_offset_hr, utc_offset_min = offset:match('^([%+%-]?)(%d?%d):?(%d%d)$');
elseif offset:match('^[%+%-]?%d?%d$') then -- informal: sign optional, 1- or 2-digit hours only
sign, utc_offset_hr = offset:match('^([%+%-]?)(%d?%d)$');
utc_offset_min = 0; -- because not included in parameter, set it to 0 minutes
else
return 0; -- malformed so return 0 seconds
end
utc_offset_hr = tonumber (utc_offset_hr);
utc_offset_min = tonumber (utc_offset_min);
if 12 < utc_offset_hr or 59 < utc_offset_min then -- hour and minute range checks
return 0;
end
if '-' == sign then
sign = -1; -- negative west offset
else
sign = 1; -- + or sign omitted east offset
end
utc_offset_hr = sign * (utc_offset_hr * 3600); -- utc offset hours * seconds/hour
utc_offset_min = sign * (utc_offset_min * 60); -- utc offset minutes * seconds/minute
return utc_offset_hr + utc_offset_min; -- return the UTC offset adjustment in seconds
end
--[[--------------------------< G E T _ D A Y S _ I N _ M O N T H >--------------------------------------------
Returns the number of days in the month where month is a number 1–12 and year is four-digit Gregorian calendar.
Accounts for leap year.
]]
local function get_days_in_month (year, month)
local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
year = tonumber (year); -- force these to be numbers just in case
month = tonumber (month);
if (2 == month) then -- if February
if (0 == (year%4) and (0 ~= (year%100) or 0 == (year%400))) then -- is year a leap year?
return 29; -- if leap year then 29 days in February
end
end
return days_in_month [month];
end
--[[--------------------------< D I F F _ T I M E >------------------------------------------------------------
calculates the difference between two times; returns a table of the differences in diff.hour, diff.min, and diff.sec
]]
local function diff_time (a, b)
local diff = {}
diff.sec = a.sec - b. sec;
if diff.sec < 0 then
diff.sec = diff.sec + 60; -- borrow from minutes
a.min = a.min - 1;
if a.min < 0 then
a.min = a.min + 60; -- borrow from hours
a.hour = a.hour - 1;
end
end
diff.min = a.min - b.min;
if diff.min < 0 then
diff.min = diff.min + 60; -- borrow from hours
a.hour = a.hour - 1;
end
diff.hour = a.hour - b.hour;
return diff;
end
--[[--------------------------< D I F F _ D A T E >------------------------------------------------------------
calculates the difference between two dates; returns a table of the difference in diff.year, diff.month, and diff.day
]]
local function diff_date (a, b)
local diff = {}
diff.day = a.day - b.day;
if diff.day < 0 then
a.month = a.month - 1;
if a.month < 1 then
a.year = a.year - 1; -- borrow a month from years
a.month = a.month + 12;
end
diff.day = diff.day + get_days_in_month (a.year, a.month); -- borrow all of the days from the *previous* month
end
diff.month = a.month - b.month;
if diff.month < 0 then
a.year = a.year - 1; -- borrow a month from years
diff.month = diff.month + 12;
end
diff.year = a.year - b.year;
return diff;
end
--[[--------------------------< I S _ V A L I D _ D A T E _ T I M E >------------------------------------------
Validate date/time. Also, determine if we have all of the necessary date/time componants. Minimal required
date/time is |year=.
For dates, these are required (all other variations emit an error message):
|year= or
|year= |month= or
|year= |month= |day=
If time is included, these are required (all other variations emit an error message):
|hour= or
|hour= |minute= or
|hour= |minute= |second=
]]
local function is_valid_date_time (year, month, day, hour, minute, second)
if not year or (not month and day) then -- must have YMD, YM, or Y
return false;
end
year = tonumber (year);
if not year or 1582 > year or 9999 < year then return false; end -- must be four digits in gregorian calander
if month then
month = tonumber (month);
if not month or 1 > month or 12 < month then return false; end -- 1 to 12
end
if day then
day = tonumber (day);
if not day or 1 > day or get_days_in_month (year, month) < day then -- 1 to 28, 29, 30, or 31 depending on month
return false;
end
end
if ((minute or second) and not hour) or (not minute and second) then -- must have H:M:S or H:M or H or none at all
return false;
end
if hour then
hour = tonumber (hour);
if not hour or 0 > hour or 23 < hour then return false; end -- 0 to 23
end
if minute then
minute = tonumber (minute);
if not minute or 0 > minute or 59 < minute then return false; end -- 0 to 59
end
if second then
second = tonumber (second);
if not second or 0 > second or 59 < second then return false; end -- 0 to 59
end
return true;
end
--[[--------------------------< M A I N >----------------------------------------------------------------------
Supported parameters:
date and time parameters:
|year= (required), |month=, |day=
|hour=, |minute=, |second=
|utc offset=
|duration=
presentation parameters:
|color=
wrapping-text parameters:
|event lead= – text ahead of countdown text while event is in progress; countdown text is time to end of event; default is static_text.ends
|event tail= – text that follows countdown text while event is in progress; default is empty string
|expired= - display text when event is in the past; default is static_text.passed; when |duration= is set then default is static_text.ended
|lead= – text ahead of countdown text; default is static_text.begins; overridden by |event lead= while event is in progress;
|tail= – text that follows countdown text; default is empty string; overridden by |event tail= while event is in progress
]]
function p.main(frame)
local args = getArgs(frame)
if false == is_valid_date_time (args.year, args.month, args.day, args.hour, args.minute, args.second) then -- validate our inputs; minimal requirement is |year=
return static_text.invalid;
end
-- convert event time parameters to seconds; use default January 1 @ 0h for defaults if not provided
local event = os.time({year=args.year, month=args.month or 1, day=args.day or 1, hour=args.hour or 0, min=args.minute, sec=args.second}); -- convert to seconds
if args['utc offset'] then
event = event - utc_offset(args['utc offset']); -- adjust event time to UTC from local time
end
if 'none' == args.expired then
args.expired = '';
end
if event < os.time () then -- if event time is in the past
if not args.duration then
return args.expired or static_text.passed; -- if the event start time has passed, we're done
else
event = event + duration (args.duration); -- calculate event ending time
if event < os.time () then
return args.expired or static_text.ended; -- if the event start time + duration has passed, we're done
end
end
else -- here when event has not yet started or occured
if not args.lead then
if args.duration then
args.lead = static_text.begins; -- default lead text when |duration= set but |lead= not set
else
args.lead = static_text.eventtime; -- default lead text when |duration= and |lead= not set
end
end
args.duration = nil; -- event not yet started; unset so that we render text around the countdown correctly
end
local today = os.date ('*t'); --fetch table of current date time parameters from the server
local event_time = os.date ('*t', event); --fetch table of event date time parameters from the server
local hms_til_start = diff_time (event_time, today) -- table of time difference (future time - current time)
if hms_til_start.hour < 0 then -- will be negative if we need to borrow hours from day
hms_til_start.hour = hms_til_start.hour + 24; -- borrow a day's worth of hours from event start date
event_time.day = event_time.day - 1;
end
local ymd_til_start = diff_date (event_time, today) -- table of date difference (future date - current date)
local result = {} -- results table with some formatting; values less than one are not added to the table
table.insert (result, format_unit (ymd_til_start.year, 'year')); -- add date parameters
table.insert (result, format_unit (ymd_til_start.month, 'month'));
table.insert (result, format_unit (ymd_til_start.day, 'day'));
local count = #result; -- zero if less than 24 hours to event; when less than 24 hours display all non-zero time units
table.insert (result, format_unit (hms_til_start.hour, 'hour')); -- always include hours if it is not zero
if args.hour or 0 == count then -- if event start hour provided in template, show non-zero minutes
table.insert (result, format_unit (hms_til_start.min, 'minute'));
end
if (args.minute and args.hour) or 0 == count then -- if event start hour and minute provided in template, show non-zero seconds
table.insert (result, format_unit (hms_til_start.sec, 'second'));
end
result = table.concat (result, ', ');
result = mw.ustring.gsub(result, '(%d+)', '<span style="color: ' .. (args.color or 'blue') .. '; font-weight: bold;">%1</span>')
local refreshLink = mw.title.getCurrentTitle():fullUrl{action = 'purge'}
refreshLink = mw.ustring.format(' <sup>[<span class="plainlinks">[%s refresh]</span>]</sup>', refreshLink)
if not args.duration then -- will be nil if event hasn't started yet or |duration= not specified
args.lead = args.lead or static_text.eventtime; -- use default begins text
else
args.lead = args['event lead'] or static_text.ends; -- event has started use |event lead= text or default ends text
args.tail = args['event tail']; -- and use |event tail= text
end
if 'none' == args.lead then -- here, if either arg.lead and args['event lead'] were set to keyword'none'
args.lead = ''; -- set lead text to empty string
elseif args.lead then
args.lead = args.lead .. ' '; -- add a space
end
if args.tail then
args.tail = ' ' .. args.tail; -- add a space
else
args.tail = ''; -- empty string for concatenation
end
return args.lead .. result .. args.tail .. refreshLink;
end
return p
