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Module:Citation/CS1/Date validation

14,594 bytes added, 8 years ago
Synch from sandbox;
local p = {}
 --[[--------------------------< F O R W A R D D E C L A R A T I O N S >--------------------------------------]] local is_set, in_array; -- imported function from selected Module:Citation/CS1/Utilities  --[=[-------------------------< I S _ V A L I D _ A C C E S S D A T E >----------------------------------------
returns true if:
adding 24 hours gives 2015-01-03T00:00:00 – one second more than tomorrow
This function does not work if it is fed month names for languages other than English. Wikimedia #time: parserapparently doesn't understand non-Engish date month names. This function will always return false when the datecontains a non-English month name because good1 is false after the call to lang.formatDate(). To get around thatcall this function with YYYY-MM-DD format dates. ]=]
local function is_valid_accessdate (accessdate)
return false; -- one or both failed to convert to unix time stamp
end
if 979516800 <= access_ts and access_ts < tomorrow_ts then -- Wikipedia start date <= accessdate < tomorrow's date
return true;
end
end
 
--[[--------------------------< G E T _ M O N T H _ N U M B E R >----------------------------------------------
local long_months = {['January']=1, ['February']=2, ['March']=3, ['April']=4, ['May']=5, ['June']=6, ['July']=7, ['August']=8, ['September']=9, ['October']=10, ['November']=11, ['December']=12};
local short_months = {['Jan']=1, ['Feb']=2, ['Mar']=3, ['Apr']=4, ['May']=5, ['Jun']=6, ['Jul']=7, ['Aug']=8, ['Sep']=9, ['Oct']=10, ['Nov']=11, ['Dec']=12};
local temp; temp=return long_months[month]; if temp then return temp; end or -- if month is the long-form name temp= short_months[month]; if temp then return temp; end or -- if month is the short-form name return 0; -- misspelled, improper case, or not a month name
end
 
 
--[[--------------------------< I S _ V A L I D _ E M B A R G O _ D A T E >------------------------------------
 
returns true and date value if that value has proper dmy, mdy, ymd format.
 
returns false and 9999 (embargoed forever) when date value is not proper format; assumes that when |embargo= is
set, the editor intended to embargo a pmc but |embargo= does not hold a single date.
 
]]
 
local function is_valid_embargo_date (v)
if v:match ('^%d%d%d%d%-%d%d%-%d%d$') or -- ymd
v:match ('^%d%d?%s+%a+%s+%d%d%d%d$') or -- dmy
v:match ('^%a+%s+%d%d?%s*,%s*%d%d%d%d$') then -- mdy
return true, v;
end
return false, '9999'; -- if here not good date so return false and set embargo date to long time in future
end
 
--[[--------------------------< G E T _ S E A S O N _ N U M B E R >--------------------------------------------
local function get_season_number (season)
local season_list = {['Winter']=121, ['Spring']=222, ['Summer']=323, ['Fall']=424, ['Autumn']=424}; -- make sure these numbers do not overlap month numbers
local temp;
temp=season_list[season];
if temp then return temp; end -- if season is a valid name return its number return 0; -- misspelled, improper case, or not a season name
end
local function is_proper_name (name)
local name_list = {['Christmas']=131}
local temp;
temp=name_list[name];
return true;
end
 
--[[--------------------------< I S _ V A L I D _ Y E A R >----------------------------------------------------
]]
local year_limit;
local function is_valid_year(year)
if not is_set(year_limit) then
end
--[[--------------------------< I S _ V A L I D _ D A T E >----------------------------------------------------Returns true if day is less than or equal to the number of days in month and year is no farther into the future than next year; else returns false. Assumes Julian calendar prior to year 1582 and Gregorian calendar thereafter. Accounts for Julian calendar leapyears before 1582 and Gregorian leap years after 1582. Where the two calendars overlap (1582 to approximately1923) dates are assumed to be Gregorian.
Assumes Julian calendar prior to year 1582 and Gregorian calendar thereafter. Accounts for Julian calendar leap years before 1582 and Gregorian leap years after 1582.
Where the two calendars overlap (1582 to approximately 1923) dates are assumed to be Gregorian.
]]
 
local function is_valid_date (year, month, day)
local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
local month_length;
if not is_valid_year(year) then -- no farther into the future than next year
return false;
end
month = tonumber(month); -- required for YYYY-MM-DD dates if (2==month) then -- if February month_length = 28; -- then 28 days unless if 1582 > tonumber(year) then -- Julian calendar
if 0==(year%4) then
month_length = 29;
end
else -- Gregorian calendar if (0==(year%4) and (0~=(year%100) or 0==(year%400))) then -- is a leap year? month_length = 29; -- if leap year then 29 days in February
end
end
local function is_valid_month_season_range(range_start, range_end)
local range_start_number = get_month_number (range_start);
local range_end_number;
if 0 == range_start_number then -- is this a month range? local range_start_number = get_season_number (range_start); -- not a month; is it a season? get start season number local range_end_number = get_season_number (range_end); -- get end season number
if 0 ~= range_start_number then -- is start of range a season? if range_start_number < range_end_number then -- range_start is a season return true; -- return true when range_end is also a season and follows start season; else false
end
if 4 24 == range_start_number and 1 21 == range_end_number then -- special case when season range is Fall-Winter or Autumn-Winter
return true;
end
end
local range_end_number = get_month_number (range_end); -- get end month number if range_start_number < range_end_number then -- range_start is a month; does range_start precede range_end?
if is_valid_month_range_style (range_start, range_end) then -- do months have the same style?
return true; -- proper order and same style
end
end
return false; -- range_start month number is greater than or equal to range end number; or range end isn't a month
end
 
 
--[[--------------------------< M A K E _ C O I N S _ D A T E >------------------------------------------------
 
This function receives a table of date parts for one or two dates and an empty table reference declared in
Module:Citation/CS1. The function is called only for |date= parameters and only if the |date=<value> is
determined to be a valid date format. The question of what to do with invalid date formats is not answered here.
 
The date parts in the input table are converted to an ISO 8601 conforming date string:
single whole dates: yyyy-mm-dd
month and year dates: yyyy-mm
year dates: yyyy
ranges: yyyy-mm-dd/yyyy-mm-dd
yyyy-mm/yyyy-mm
yyyy/yyyy
 
Dates in the Julian calendar are reduced to year or year/year so that we don't have to do calendar conversion from
Julian to Proleptic Gregorian.
 
The input table has:
year, year2 – always present; if before 1582, ignore months and days if present
month, month2 – 0 if not provided, 1-12 for months, 21-24 for seasons; 31– proper name dates
day, day2 – 0 if not provided, 1-31 for days
the output table receives:
rftdate: an IS8601 formatted date
rftchron: a free-form version of the date, usually without year which is in rftdate (season ranges and propername dates)
rftssn: one of four season keywords: winter, spring, summer, fall (lowercase)
 
]]
 
local function make_COinS_date (input, tCOinS_date)
local date; -- one date or first date in a range
local date2 = ''; -- end of range date
if 1582 > tonumber(input.year) or 20 < tonumber(input.month) then -- Julian calendar or season so &rft.date gets year only
date = input.year;
if 0 ~= input.year2 and input.year ~= input.year2 then -- if a range, only the second year portion when not the same as range start year
date = string.format ('%.4d/%.4d', tonumber(input.year), tonumber(input.year2)) -- assemble the date range
end
if 20 < tonumber(input.month) then -- if season or propername date
local season = {[21]='winter', [22]='spring', [23]='summer', [24]='fall', [31]='Christmas'}; -- seasons lowercase, no autumn; proper names use title case
if 0 == input.month2 then -- single season date
if 30 <tonumber(input.month) then
tCOinS_date.rftchron = season[input.month]; -- proper name dates
else
tCOinS_date.rftssn = season[input.month]; -- seasons
end
else -- season range with a second season specified
if input.year ~= input.year2 then -- season year – season year range or season year–year
tCOinS_date.rftssn = season[input.month]; -- start of range season; keep this?
if 0~= input.month2 then
tCOinS_date.rftchron = string.format ('%s %s – %s %s', season[input.month], input.year, season[input.month2], input.year2);
end
else -- season–season year range
tCOinS_date.rftssn = season[input.month]; -- start of range season; keep this?
tCOinS_date.rftchron = season[input.month] .. '–' .. season[input.month2]; -- season–season year range
end
end
end
tCOinS_date.rftdate = date;
return; -- done
end
if 0 ~= input.day then
date = string.format ('%s-%.2d-%.2d', input.year, tonumber(input.month), tonumber(input.day)); -- whole date
elseif 0 ~= input.month then
date = string.format ('%s-%.2d', input.year, tonumber(input.month)); -- year and month
else
date = string.format ('%s', input.year); -- just year
end
 
if 0 ~= input.year2 then
if 0 ~= input.day2 then
date2 = string.format ('/%s-%.2d-%.2d', input.year2, tonumber(input.month2), tonumber(input.day2)); -- whole date
elseif 0 ~= input.month2 then
date2 = string.format ('/%s-%.2d', input.year2, tonumber(input.month2)); -- year and month
else
date2 = string.format ('/%s', input.year2); -- just year
end
end
tCOinS_date.rftdate = date .. date2; -- date2 has the '/' separator
return;
end
 
--[[--------------------------< C H E C K _ D A T E >----------------------------------------------------------
Check date format to see that it is one of the formats approved by WP:DATESNO or WP:DATERANGE. Exception: only allowed range separator is endash. Additionally, check the date to see that it is a real date: no 31 in 30-day months; no 29 February when not a leap year. Months, both long-form and threecharacter abbreviations, and seasons must be spelled correctly. Future years beyond next year are not allowed.
If the date fails the format tests, this function returns false and does not return values for anchor_year and COinS_date. When this happens, the date parameter isused in the COinS metadata and the CITEREF identifier gets its year from the year parameter if present otherwise CITEREF does not get a date value.
Inputs:
true, anchor_year, COinS_date
anchor_year can be used in CITEREF anchors
COinS_date is date_string without anchor_year disambiguator if anyISO 8601 format date; see make_COInS_date() 
]]
 local function check_date (date_string, tCOinS_date, test_accessdate)
local year; -- assume that year2, months, and days are not used;
local year2=0; -- second year in a year range
if date_string:match("^%d%d%d%d%-%d%d%-%d%d$") then -- year-initial numerical year month day format
year, month, day=string.match(date_string, "(%d%d%d%d)%-(%d%d)%-(%d%d)");
month=tonumber(month); if 12 < tonumber(month ) or 1 > tonumber(month ) or 1583 1582 > tonumber(year) or 0 == tonumber(day) then return false; end -- month or day number not valid or not Gregorian calendar
anchor_year = year;
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
elseif date_string:mw.ustring.match(date_string, "^%a+ +[1-9]%d?[%-–][1-9]%d?, +[1-9]%d%d%d%a?$") then -- month-initial day range: month day–day, year; days are separated by endash month, day, day2, anchor_year, year=stringmw.ustring.match(date_string, "(%a+) +(%d%d?)[%-–](%d%d?), +((%d%d%d%d)%a?)");
if tonumber(day) >= tonumber(day2) then return false; end -- date range order is left to right: earlier to later; dates may not be the same;
month = get_month_number (month);
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
month2=month; -- for metadata
year2=year;
elseif date_string:match("^[1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day-initial: day month year
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
elseif date_string:mw.ustring.match(date_string, "^[1-9]%d?[%-–][1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day-range-initial: day–day month year; days are separated by endash day, day2, month, anchor_year, year=stringmw.ustring.match(date_string, "(%d%d?)[%-–](%d%d?) +(%a+) +((%d%d%d%d)%a?)");
if tonumber(day) >= tonumber(day2) then return false; end -- date range order is left to right: earlier to later; dates may not be the same;
month = get_month_number (month);
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
month2=month; -- for metadata
year2=year;
elseif date_string:mw.ustring.match(date_string, "^[1-9]%d? +%a+ [%-– ] [1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day initial month-day-range: day month - day month year; uses spaced endash day, month, day2, month2, anchor_year, year=date_string:mw.ustring.match(date_string, "(%d%d?) +(%a+) [%-– ] (%d%d?) +(%a+) +((%d%d%d%d)%a?)");
if (not is_valid_month_season_range(month, month2)) or not is_valid_year(year) then return false; end -- date range order is left to right: earlier to later;
month = get_month_number (month); -- for metadata
month2 = get_month_number (month2);
year2=year;
elseif date_string:mw.ustring.match(date_string, "^%a+ +[1-9]%d? [%-– ] %a+ +[1-9]%d?, +[1-9]%d%d%d?%a?$") then -- month initial month-day-range: month day – month day, year; uses spaced endash month, day, month2, day2, anchor_year, year=date_string:mw.ustring.match(date_string, "(%a+) +(%d%d?) [%-– ] (%a+) +(%d%d?), +((%d%d%d%d)%a?)");
if (not is_valid_month_season_range(month, month2)) or not is_valid_year(year) then return false; end
month = get_month_number (month); -- for metadata
month2 = get_month_number (month2);
year2=year;
elseif date_string:mw.ustring.match(date_string, "^[1-9]%d? +%a+ +[1-9]%d%d%d [%-– ] [1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day initial month-day-year-range: day month year - day month year; uses spaced endash day, month, year, day2, month2, anchor_year, year2=date_string:mw.ustring.match(date_string, "(%d%d?) +(%a+) +(%d%d%d%d?) [%-– ] (%d%d?) +(%a+) +((%d%d%d%d?)%a?)"); if tonumber(year2) <= tonumber(year) then return false; end -- must be sequential years, left to right, earlier to later
if not is_valid_year(year2) or not is_valid_month_range_style(month, month2) then return false; end -- year2 no more than one year in the future; months same style
month = get_month_number (month); -- for metadata
month2 = get_month_number (month2);
elseif date_string:mw.ustring.match(date_string, "^%a+ +[1-9]%d?, +[1-9]%d%d%d [%-– ] %a+ +[1-9]%d?, +[1-9]%d%d%d%a?$") then -- month initial month-day-year-range: month day, year – month day, year; uses spaced endash month, day, year, month2, day2, anchor_year, year2=date_string:mw.ustring.match(date_string, "(%a+) +(%d%d?), +(%d%d%d%d) [%-– ] (%a+) +(%d%d?), +((%d%d%d%d)%a?)"); if tonumber(year2) <= tonumber(year) then return false; end -- must be sequential years, left to right, earlier to later
if not is_valid_year(year2) or not is_valid_month_range_style(month, month2) then return false; end -- year2 no more than one year in the future; months same style
month = get_month_number (month); -- for metadata
month2 = get_month_number (month2);
elseif date_string:mw.ustring.match(date_string, "^%a+ +[1-9]%d%d%d–d[%-–]%d%d%a?$") then -- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash if nil == date_string:match("^Winter") and nil == date_string:match("^Summer") then return false end; -- 'month' can only be Winter or Summer
local century;
month, year, century, anchor_year, year2=date_string:mw.ustring.match(date_string, "(%a+ ) +((%d%d)%d%d)[%-–]((%d%d)%a?)"); if 'Winter' ~= month and 'Summer' ~= month then return false end; -- 'month' can only be Winter or Summer
anchor_year=year..'–'..anchor_year; -- assemble anchor_year from both years
year2 = century..year2; -- add the century to year2 for comparisons
if 1 ~= tonumber(year2) - tonumber(year) then return false; end -- must be sequential years, left to right, earlier to later
if not is_valid_year(year2) then return false; end -- no year farther in the future than next year
month = get_season_number (month);
elseif date_string:mw.ustring.match(date_string, "^%a+ +[1-9]%d%d%d–d[%-–][1-9]%d%d%d%a?$") then -- special case Winter/Summer year-year; year separated with unspaced endash if nil == date_string:match("^Winter") and nil == date_string:match("^Summer") then return false end; -- 'month' can only be Winter or Summer , year, anchor_year, year2=date_string:mw.ustring.match(date_string, "(%a+ ) +(%d%d%d%d)[%-–]((%d%d%d%d)%a?)"); if 'Winter' ~= month and 'Summer' ~= month then return false end; -- 'month' can only be Winter or Summer
anchor_year=year..'–'..anchor_year; -- assemble anchor_year from both years
if 1 ~= tonumber(year2) - tonumber(year) then return false; end -- must be sequential years, left to right, earlier to later
if not is_valid_year(year2) then return false; end -- no year farther in the future than next year
month = get_season_number (month); -- for metadata
elseif date_string:mw.ustring.match(date_string, "^%a+ +[1-9]%d%d%d+[% -– ] +%a+ +[1-9]%d%d%d%a?$") then -- month/season year - month/season year; separated by spaced endash month, year, month2, anchor_year, year2=date_string:mw.ustring.match(date_string, "(%a+) +(%d%d%d%d) +[%-– ] +(%a+) +((%d%d%d%d)%a?)");
anchor_year=year..'–'..anchor_year; -- assemble anchor_year from both years
if tonumber(year) >= tonumber(year2) then return false; end -- left to right, earlier to later, not the same
if not is_valid_year(year2) then return false; end -- no year farther in the future than next year
if not((0 ~= get_month_number(month) and 0 ~= get_month_number(month2) and is_valid_month_range_style(month, month2)) or then -- both must be month year, same month style month = get_month_number(month); month2 = get_month_number(month2); elseif 0 ~= get_season_number(month) and 0 ~= get_season_number(month2))) then return false; end -- both must be or season year, not mixed month = get_season_number(month); month2 = get_season_number(month2); else return false; end
elseif date_string:mw.ustring.match (date_string, "^%a+[%-–]%a+ +[1-9]%d%d%d%a?$") then -- month/season range year; months separated by endash month, month2, anchor_year, year=date_string:mw.ustring.match (date_string, "(%a+)[%-–](%a+)%s*((%d%d%d%d)%a?)"); if (not is_valid_month_season_range(month, month2)) or (not is_valid_year(year)) then return false; end if 0 ~= get_month_number(month) then -- determined to be a valid range so just check this one to know if month or season month = get_month_number(month); month2 = get_month_number(month2); else month = get_season_number(month); month2 = get_season_number(month2);
end
year2=year;
elseif date_string:match("^%a+ +%d%d%d%d%a?$") then -- month/season year or proper-name year
if not is_valid_year(year) then return false; end
if not is_valid_month_or_season (month) and 0 == is_proper_name (month) then return false; end
if 0 ~= get_month_number(month) then -- determined to be a valid range so just check this one to know if month or season
month = get_month_number(month);
elseif 0 ~= get_season_number(month) then
month = get_season_number(month);
else
month = is_proper_name (month); -- must be proper name; not supported in COinS
end
elseif date_string:mw.ustring.match(date_string, "^[1-9]%d%d%d?[%-–][1-9]%d%d%d?%a?$") then -- Year range: YYY-YYY or YYY-YYYY or YYYY–YYYY; separated by unspaced endash; 100-9999 year, anchor_year, year2=date_string:mw.ustring.match(date_string, "(%d%d%d%d?)[%-–]((%d%d%d%d?)%a?)");
anchor_year=year..'–'..anchor_year; -- assemble anchor year from both years
if tonumber(year) >= tonumber(year2) then return false; end -- left to right, earlier to later, not the same
if not is_valid_year(year2) then return false; end -- no year farther in the future than next year
elseif date_string:mw.ustring.match(date_string, "^[1-9]%d%d%d–d[%-–]%d%d%a?$") then -- Year range: YYYY–YY; separated by unspaced endash
local century;
year, century, anchor_year, year2=date_string:mw.ustring.match(date_string, "((%d%d)%d%d)[%-–]((%d%d)%a?)");
anchor_year=year..'–'..anchor_year; -- assemble anchor year from both years
if 13 > tonumber(year2) then return false; end -- don't allow 2003-05 which might be May 2003
else
return false; -- date format not one of the MOS:DATE approved formats end  if test_accessdate then -- test accessdate here because we have numerical date parts if 0 ~= year and 0 ~= month and 0 ~= day and -- all parts of a single date required 0 == year2 and 0 == month2 and 0 == day2 then -- none of these; accessdate must not be a range if not is_valid_accessdate (year..'-'..month..'-'..day) then return false; -- return false when accessdate out of bounds end else return false; -- return false when accessdate is a range of two dates end
end
local result=true; -- check whole dates for validity; assume true because not all dates will go through this test
if 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 == month2 and 0 == day2 then -- YMD (simple whole date)
result=is_valid_date(year,month,day);
if false == result then return false; end
-- if here, then date_string is valid; get coins_date from date_string (leave CITEREF disambiguator) ... coins_dateif nil ~=date_string:match("^(.+%d)%a?$"); tCOinS_date then -- last character of valid disambiguatable this table only passed into this function when testing |date is always a digit coins_date= mw.ustring.gsubparameter values make_COinS_date (coins_date{year=year, "–"month=month, "-" day=day, year2=year2, month2=month2, day2=day2}, tCOinS_date); -- ... and replace any ndash with a hyphenmake an ISO 8601 date string for COinS end
return true, anchor_year, coins_date; -- format is good and date string represents a real date
end
 
--[[--------------------------< D A T E S >--------------------------------------------------------------------
]]
--function p.dates(date_parameters_list)local function dates(date_parameters_list, tCOinS_date)
local anchor_year; -- will return as nil if the date being tested is not |date=
local COinS_date; -- will return as nil if the date being tested is not |date=
local embargo_date; -- if embargo date is a good dmy, mdy, ymd date then holds original value else reset to 9999
local error_message = "";
local mismatch = 0;
local good_date = false;
for k, v in pairs(date_parameters_list) do -- for each date-holding parameter in the list if is_set(v) then -- if the parameter has a value if v:match("^c%. [1-9]%d%d%d?%a?$") then -- special case for c. year or with or without CITEREF disambiguator - only |date= and |year= local year = v:match("c%. ([1-9]%d%d%d?)%a?"); -- get the year portion so it can be tested
if 'date'==k then
anchor_year, COinS_date = v:match("((c%. [1-9]%d%d%d?)%a?)"); -- anchor year and COinS_date only from |date= parameter
good_date = is_valid_year(year);
end
elseif 'date'==k then -- if the parameter is |date= if v:match("^n%.d%.%a?$") then -- if |date=n.d. with or without a CITEREF disambiguator
good_date, anchor_year, COinS_date = true, v:match("((n%.d%.)%a?)"); --"n.d."; no error when date parameter is set to no date
elseif v:match("^nd%a?$") then -- if |date=nd with or without a CITEREF disambiguator
good_date, anchor_year, COinS_date = true, v:match("((nd)%a?)"); --"nd"; no error when date parameter is set to no date
else
good_date, anchor_year, COinS_date = check_date (v, tCOinS_date); -- go test the date end elseif 'year'==k then -- if the parameter is |year= it should hold only a year value if v:match("^[1-9]%d%d%d?%a?$") then -- if |year= 3 or 4 digits only with or without a CITEREF disambiguator good_date, anchor_year, COinS_date = true, v:match("((%d+)%a?)");
end
elseif 'accessdateaccess-date'==k then -- if the parameter is |date= good_date = check_date (v, nil, true); -- go test the date; nil is a placeholder; true is the test_accessdate flag elseif 'embargo'==k then -- if the parameter is |embargo= good_date = check_date (v); -- go test the date if true == good_date then -- if the date is a valid date good_date , embargo_date = is_valid_accessdate is_valid_embargo_date (v); -- is Wikipedia start |embargo= date < accessdate < tomorrow's a single dmy, mdy, or ymd formatted date?yes:returns embargo; no: returns 9999
end
else -- any other date-holding parameter good_date = check_date (v); -- go test the date
end
if false==good_date then -- assemble one error message so we don't add the tracking category multiple times if is_set(error_message) then -- once we've added the first portion of the error message ... error_message=error_message .. ", "; -- ... add a comma space separator
end
error_message=error_message .. "&#124;" .. k .. "="; -- add the failed parameter
end
end
end
return anchor_year, COinS_dateembargo_date, error_message, mismatch; -- and done
end
 
--[[--------------------------< Y E A R _ D A T E _ C H E C K >------------------------------------------------
year = year_string:match ('(%d%d%d%d?)');
if date_string:match ('%d%d%d%d%-%d%d%-%d%d') and year_string:match ('%d%d%d%d%a') then --special case where both date and year are required YYYY-MM-DD and YYYYx
date1 = date_string:match ('(%d%d%d%d)');
year = year_string:match ('(%d%d%d%d)');
end
elseif date_string:match ("%d%d%d%d?.-%d%d%d%d?") then -- any of the standard range formats of date with two three- or four-digit years
date1, date2 = date_string:match ("(%d%d%d%d?).-(%d%d%d%d?)");
if year ~= date1 and year ~= date2 then
end
elseif date_string:mw.ustring.match (date_string, "%d%d%d%d[%s%-–]+%d%d") then -- YYYY-YY date ranges
local century;
date1, century, date2 = date_string:mw.ustring.match (date_string, "((%d%d)%d%d)[%s%-–]+(%d%d)");
date2 = century..date2; -- convert YY to YYYY
if year ~= date1 and year ~= date2 then
result = 0;
end
else
result = 0; -- no recognizable year in date
end
return result;
end
return {--[[-------------------------< R E F O R M A T T A B L E S >------------------------------------------------ These table are used exclusively for reformatting dates  ]] local source_patterns = { -- this table holds patterns that match allowed date formats used to extract date components ['dmy'] = '(%d%d?)%s+(%a+)%s+(%d%d%d%d)', ['mdy'] = '(%a+)%s+(%d%d?),%s+(%d%d%d%d)', ['ymd'] = '(%d%d%d%d)%-(%d%d)-(%d%d)', } local short_formats = { -- this table holds format strings used by os.date() for short month names ['dmy'] = '%e %b %Y', ['mdy'] = '%b %e, %Y', ['ymd'] = '%F', } local long_formats = { -- this table holds format strings used by os.date() for long month names ['dmy'] = '%e %B %Y', ['mdy'] = '%B %e, %Y', ['ymd'] = '%F', }  --[[-------------------------< G E T _ D M Y _ D A T E _ P A R T S >------------------------------------------ extracts year, month and day from DMY formatted date, places them in the source_date table, and returns. ]] local function get_dmy_date_parts (date, source_date) source_date.day, source_date.month, source_date.year = date:match (source_patterns['dmy']); -- get date components as strings source_date.month = get_month_number (source_date.month); -- get month numberend  --[[-------------------------< G E T _ M D Y _ D A T E _ P A R T S >------------------------------------------ extracts year, month and day from MDY formatted date, places them in the source_date table, and returns. ]] local function get_mdy_date_parts (date, source_date) source_date.month, source_date.day, source_date.year = date:match (source_patterns['mdy']); -- get date components as strings source_date.month = get_month_number (source_date.month); -- get month numberend  --[[-------------------------< G E T _ Y M D _ D A T E _ P A R T S >------------------------------------------ extracts year, month and day from YMD formatted date, places them in the source_date table, and returns. ]] local function get_ymd_date_parts (date, source_date) source_date.year, source_date.month, source_date.day = date:match (source_patterns['ymd']); -- get date components as stringsend  --[[-------------------------< R E F O R M A T _ D A T E S >-------------------------------------------------- Reformats existing datesinto the format specified by format and short. format is one of several keywords: dmy, year_date_check dmy-all, mdy, mdy-all, ymd, ymd-all. The all version includes access- andarchive-dates; otherwise these dates are not reformatted Date ranges, season dates, proper name dates are not currently supported. ]] local function reformat_dates (date_parameters_list, format, short) local all = year_date_checkfalse; -- set to false to skip access- and archive-dates local format_str; local source_date = {} ; if format:match('%a+%-all') then format = format:match('(%a+)%-all'); -- extract the format all = true; -- set to true to format access- and archive-dates end for param_name, param_val in pairs(date_parameters_list) do -- for each date-holding parameter in the list if is_set(param_val) then -- if the parameter has a value if not all and in_array (param_name, {'access-date', 'archive-date'}) then -- if access- or archive-date and format not xxx-all param_val = ''; -- set to empty string so we don't process this date end for source, pattern in pairs(source_patterns) do if param_val:match(pattern) then if 'ymd' == source then get_ymd_date_parts (param_val, source_date); -- get the date parts into the source_date table elseif 'dmy' == source then get_dmy_date_parts (param_val, source_date); -- get the date parts into the source_date table elseif 'mdy' == source then get_mdy_date_parts (param_val, source_date); -- get the date parts into the source_date table end  if 'ymd' == format and 1582 > tonumber(source_date.year) then -- ymd format dates not allowed before 1582 return false; -- abandon reformatting end if short then format_str = short_formats[format]; else format_str = long_formats[format]; end -- convert date and save; date_parameters_list[param_name] = mw.text.trim (os.date (format_str, os.time(source_date))); -- strip leading space when single digit day and %e is first format end end end end return true; -- declare success and doneend  --[[--------------------------< D A T E _ H Y P H E N _ T O _ D A S H >---------------------------------------- Loops through the list of date-holding parameters and converts any hyphen to an ndash. Not called if the cs1|2template has any date errors. Modifies the date_parameters_list and returns true if hyphens are replaced, else returns false. ]] local function date_hyphen_to_dash (date_parameters_list) local result = false; local n; for param_name, param_val in pairs(date_parameters_list) do -- for each date-holding parameter in the list if not param_val:match ('%d%d%d%d%-%d%d%-%d%d') then -- for those that are not ymd dates param_val, n = param_val:gsub ('%-', '–'); -- replace any hyphen with ndash if 0 ~= n then date_parameters_list[param_name] = param_val; -- update the list result = true; end end end return result; -- so we know if end  --[[--------------------------< S E T _ S E L E C T E D _ M O D U L E S >-------------------------------------- Sets local imported functions table to same (live or sandbox) as that used by the other modules. ]] local function set_selected_modules (utilities_page_ptr) is_set = utilities_page_ptr.is_set; -- import functions from select Module:Citation/CS1/Utilities module in_array = utilities_page_ptr.in_array; -- import functions from select Module:Citation/CS1/Utilities moduleend   return { -- return exported functions dates = dates, year_date_check = year_date_check, reformat_dates = reformat_dates, date_hyphen_to_dash = date_hyphen_to_dash, set_selected_modules = set_selected_modules }
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