Module:Calendar date
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This module implements Template:Ti.
Usage
{{#invoke:Calendar date|function_name}}
--[[
Display Gregorian date of a holiday that moves year to year. Date data can be obtained from multiple sources as configured in Module:Calendar date/events
"localfile" = local data file (eg. https://en.wikipedia.org/wiki/Module:Calendar_date/localfiles/Hanukkah)
"calculator" = user-supplied date calculator
"wikidata" = <tbd> for holidays with their own date entity page such as https://www.wikidata.org/wiki/Q51224536
]]
require('Module:No globals')
local p = {}
local cfg -- Data structure from ~/events
local eventdata -- Data structure from ~/localfiles/<holiday name>
local track = {} -- Tracking category container
--[[--------------------------< inlineError >-----------------------
Critical error. Render output completely in red. Add to tracking category.
]]
local function inlineError(arg, msg, tname)
track["Category:Calendar date template errors"] = 1
return '<span style="font-size:100%" class="error citation-comment">Error in {{' .. tname .. '}} - Check <code style="color:inherit; border:inherit; padding:inherit;">|' .. arg .. '=</code> ' .. msg .. '</span>'
end
--[[--------------------------< trimArg >-----------------------
trimArg returns nil if arg is "" while trimArg2 returns 'true' if arg is ""
trimArg2 is for args that might accept an empty value, as an on/off switch like nolink=
]]
local function trimArg(arg)
if arg == "" or arg == nil then
return nil
else
return mw.text.trim(arg)
end
end
local function trimArg2(arg)
if arg == nil then
return nil
else
return mw.text.trim(arg)
end
end
--[[--------------------------< tableLength >-----------------------
Given a 1-D table, return number of elements
]]
local function tableLength(T)
local count = 0
for _ in pairs(T) do count = count + 1 end
return count
end
--[[-------------------------< make_wikilink >----------------------------------------------------
Makes a wikilink; when both link and display text is provided, returns a wikilink in the form [ [L|D] ]; if only
link is provided, returns a wikilink in the form [ [L] ]; if neither are provided or link is omitted, returns an
empty string.
]]
local function make_wikilink (link, display, no_link)
if nil == no_link then
if link and ('' ~= link) then
if display and ('' ~= display) then
return table.concat ({'[[', link, '|', display, ']]'});
else
return table.concat ({'[[', link, ']]'});
end
end
else -- no_link
if display and ('' ~= display) then -- if there is display text
return display; -- return that
else
return link or ''; -- return the target article name or empty string
end
end
end
--[[--------------------------< createTracking >-----------------------
Return data in track[] ie. tracking categories
]]
local function createTracking()
local out = {};
if tableLength(track) > 0 then
for key, _ in pairs(track) do -- loop through table
table.insert (out, make_wikilink (key)) -- and convert category names to links
end
end
return table.concat (out) -- concat into one big string; empty string if table is empty
end
--[[--------------------------< isValidDate >----------------------------------------------------
Returns true if date is after 31 December 1899 , not after 2100, and represents a valid date
(29 February 2017 is not a valid date). Applies Gregorian leapyear rules. All arguments are required.
]]
local function isValidDate (year, month, day)
local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
local month_length
local y, m, d
local today = os.date ('*') -- fetch a table of current date parts
if not year or year == '' or not month or month == '' or not day or day == '' then
return false -- something missing
end
y = tonumber (year)
m = tonumber (month)
d = tonumber (day)
if 1900 > y or 2100 < y or 1 > m or 12 < m then -- year and month are within bounds
return false
end
if (2==m) then -- if February
month_length = 28 -- then 28 days unless
if (0==(y%4) and (0~=(y%100) or 0==(y%400))) then -- is a leap year?
month_length = 29 -- if leap year then 29 days in February
end
else
month_length=days_in_month[m];
end
if 1 > d or month_length < d then -- day is within bounds
return false
end
return true
end
--[[--------------------------< makeDate >-----------------------
Given a zero-padded 4-digit year, 2-digit month and 2-digit day, return a full date in df format
df = mdy, dmy, iso, ymd
]]
local function makeDate(year, month, day, df, format)
local formatFull = {
['dmy'] = 'j F Y',
['mdy'] = 'F j, Y',
['ymd'] = 'Y F j',
['iso'] = 'Y-m-d'
}
local formatInfobox = {
['dmy'] = 'j F',
['mdy'] = 'F j',
['ymd'] = 'F j',
['iso'] = 'Y-m-d'
}
if not year or year == "" or not month or month == "" or not day or day == "" and format[df] then
return nil
end
local date = table.concat ({year, month, day}) -- assemble iso format date
if format ~= "infobox" then
return mw.getContentLanguage():formatDate (formatFull[df], date)
else
return mw.getContentLanguage():formatDate (formatInfobox[df], date)
end
end
--[[--------------------------< dateOffset >-----------------------
Given a 'origdate' in ISO format, return the date offset by number of days in 'offset'
eg. given "2018-02-01" and "-1" it will return "2018-01-30"
On error, return origdate
]]
local function dateOffset(origdate, offset)
local year, month, day = origdate:match ('(%d%d%d%d)-(%d%d)-(%d%d)')
local now = os.time{year = year, month = month, day = day}
local newdate = os.date("%Y-%m-%d", now + (tonumber(offset) * 24 * 3600))
return newdate and newdate or origdate
end
--[[--------------------------< renderHoli >-----------------------
Render the data
]]
local function renderHoli(cfg,eventdata,calcdate,date,df,format,tname,cite)
local hits = 0
local matchdate = "^" .. date
local startdate,enddate,outoffset,endoutoffset = nil
local starttitle,endtitle = ""
-- user-supplied date calculator
if cfg.datatype == "calculator" then
if cfg.datasource then
startdate = calcdate
enddate = dateOffset(startdate, cfg.days - 1)
else
return inlineError("holiday", 'invalid calculator result', tname )
end
-- read dates from localfile -- it assumes dates are in chrono order, need a more flexible method
elseif cfg.datatype == "localfile" then
local numRecords = tableLength(eventdata) -- Get first and last date of holiday
for i = 1, numRecords do
if mw.ustring.find( eventdata[i].date, matchdate ) then
if hits == 0 then
startdate = eventdata[i].date
hits = 1
end
if hits >= tonumber(cfg.days) then
enddate = eventdata[i].date
break
end
hits = hits + 1
end
end
end
-- Verify data and special conditions
if startdate == nil or enddate == nil then
if cfg.name == "Hanukkah" and startdate and not enddate then -- Hanukkah bug, template doesn't support cross-year boundary
enddate = dateOffset(startdate, 8)
elseif cfg.datatype == "localfile" and cfg.days > "1" and startdate then
enddate = dateOffset(startdate, cfg.days - 1)
elseif startdate and not enddate then
return inlineError("year", 'cannot find enddate', tname) .. createTracking()
else
return inlineError("holiday", 'cannot find startdate and enddate', tname) .. createTracking()
end
end
-- Generate start-date offset (ie. holiday starts the evening before the given date)
if cfg.startoffset then
startdate = dateOffset(startdate, cfg.startoffset)
if startdate ~= enddate then
enddate = dateOffset(enddate, cfg.startoffset)
else
cfg.days = (cfg.days == "1") and "2"
end
end
-- Generate end-date outside-Irael offset (ie. outside Israel the holiday ends +1 day later)
endoutoffset = cfg.endoutoffset and dateOffset(enddate, cfg.endoutoffset)
-- Format dates into df format
local year, month, day = startdate:match ('(%d%d%d%d)-(%d%d)-(%d%d)')
startdate = makeDate(year, month, day, df, format)
year, month, day = enddate:match ('(%d%d%d%d)-(%d%d)-(%d%d)')
enddate = makeDate(year, month, day, df, format)
if startdate == nil or enddate == nil then return nil end
-- Add "outside of Israel" notices
if endoutoffset then
year, month, day = endoutoffset:match ('(%d%d%d%d)-(%d%d)-(%d%d)')
local leader = ((format == "infobox") and "<br>") or " "
endoutoffset = leader .. "(" .. makeDate(year, month, day, df, "infobox") .. " outside of Israel)"
end
if not endoutoffset then
endoutoffset = ""
end
--- Determine format string
format = ((format == "infobox") and " –<br>") or " – "
--- Determine pre-pended text string eg. "sunset, <date>"
local prepend1 = (cfg.prepend1 and (cfg.prepend1 .. ", ")) or ""
local prepend2 = (cfg.prepend2 and (cfg.prepend2 .. ", ")) or ""
-- return output
if startdate == enddate or cfg.days == "1" then -- single date
return prepend1 .. startdate .. endoutoffset .. cite
else
return prepend1 .. startdate .. format .. prepend2 .. enddate .. endoutoffset .. cite
end
end
--[[--------------------------< calendardate >-----------------------
Main function
]]
function p.calendardate(frame)
local pframe = frame:getParent()
local args = pframe.args
local tname = "Calendar date" -- name of calling template. Change if template rename.
local holiday = nil -- name of holiday
local date = nil -- date of holiday (year)
local df = nil -- date format (mdy, dmy, iso - default: iso)
local format = nil -- template display format options
local cite = nil -- leave a citation at end
local calcdate = ""
--- Determine holiday
holiday = trimArg(args.holiday) -- required
if not holiday then
holiday = trimArg(args.event) -- event alias
if not holiday then
return inlineError("holiday", 'missing holiday argument', tname) .. createTracking()
end
end
--- Determine date
date = trimArg(args.year) -- required
if not date then
return inlineError("year", 'missing year argument', tname) .. createTracking()
elseif not isValidDate(date, "01", "01") then
return inlineError("year", 'invalid year', tname) .. createTracking()
end
--- Determine format type
format = trimArg(args.format)
if not format then
format = "none"
elseif format ~= "infobox" then
format = "none"
end
-- Load configuration file
local eventsfile = mw.loadData ('Module:Calendar date/events')
if eventsfile.hebrew_calendar[mw.ustring.upper(holiday)] then
cfg = eventsfile.hebrew_calendar[mw.ustring.upper(holiday)]
elseif eventsfile.christian_events[mw.ustring.upper(holiday)] then
cfg = eventsfile.christian_events[mw.ustring.upper(holiday)]
elseif eventsfile.carnivals[mw.ustring.upper(holiday)] then
cfg = eventsfile.carnivals[mw.ustring.upper(holiday)]
elseif eventsfile.chinese_events[mw.ustring.upper(holiday)] then
cfg = eventsfile.chinese_events[mw.ustring.upper(holiday)]
elseif eventsfile.misc_events[mw.ustring.upper(holiday)] then
cfg = eventsfile.misc_events[mw.ustring.upper(holiday)]
else
return inlineError("holiday", 'unknown holiday ' .. holiday, tname) .. createTracking()
end
-- If datatype = localfile
if cfg.datatype == "localfile" then
local eventfile = nil
eventfile = mw.loadData(cfg.datasource)
if eventfile.event then
eventdata = eventfile.event
else
return inlineError("holiday", 'unknown holiday file ' .. cfg.datasource .. '</span>', tname) .. createTracking()
end
-- If datatype = calculator
elseif cfg.datatype == "calculator" then
calcdate = frame:preprocess(cfg.datasource:gsub("YYYY", date))
local year, month, day = calcdate:match ('(%d%d%d%d)-(%d%d)-(%d%d)')
if not isValidDate(year, month, day) then
return inlineError("holiday", 'invalid calculated date ' .. calcdate, tname) .. createTracking()
end
else
return inlineError("holiday", 'unknown "datatype" in configuration', tname) .. createTracking()
end
--- Determine df - priority to |df in template, otherwise df in datafile, otherwise default to dmy
df = trimArg(args.df)
if not df then
df = (cfg.df and cfg.df) or "dmy"
end
if df ~= "mdy" and df ~= "dmy" and df ~= "iso" then
df = "dmy"
end
-- Determine citation
cite = trimArg2(args.cite)
if cite then
if (cite ~= "no") then
cite = ""
if cfg.citeurl and cfg.accessdate and cfg.source and cfg.name then
local citetitle = cfg.citetitle
if citetitle == nil then
citetitle = 'Dates for ' .. cfg.name
end
cite = frame:preprocess('<ref name="' .. holiday .. ' dates">{{cite web |url=' .. cfg.citeurl .. ' |title=' .. citetitle .. ' |publisher=' .. cfg.source .. '|accessdate=' .. cfg.accessdate .. '}}</ref>')
elseif cfg.source then
cite = frame:preprocess('<ref name="' .. holiday .. ' dates">' .. cfg.source:gsub("YYYY", date) .. '</ref>')
else
cite = ""
end
else
cite = ""
end
else
cite = ""
end
-- Render
local rend = renderHoli( cfg,eventdata,calcdate,date,df,format,tname,cite)
if not rend then
rend = '<span style="font-size:100%" class="error citation-comment">Error in [[:Template:' .. tname .. ']]: Unknown problem. Please report on template talk page.</span>'
track["Category:Webarchive template errors"] = 1
end
return rend .. createTracking()
end
return p
