Module:Citation/CS1/Date validation: Difference between revisions

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local p = {}

-- returns a number according to the month in a date: 1 for January, etc. Capitalization and spelling must be correct. If not a valid month, returns 0

--[[--------------------------< I S _ V A L I D _ A C C E S S D A T E >----------------------------------------

returns true if:

Wikipedia start date <= accessdate < today + 2 days

Wikipedia start date is 2001-01-15T00:00:00 UTC which is 979516800 seconds after 1970-01-01T00:00:00 UTC (the start of Unix time)

accessdate is the date provided in |accessdate= at time 00:00:00 UTC

today is the current date at time 00:00:00 UTC plus 48 hours

if today is 2015-01-01T00:00:00 then

adding 24 hours gives 2015-01-02T00:00:00 – one second more than today

adding 24 hours gives 2015-01-03T00:00:00 – one second more than tomorrow

]]

local function is_valid_accessdate (accessdate)

local lang = mw.getContentLanguage();

local good1, good2;

local access_ts, tomorrow_ts; -- to hold unix time stamps representing the dates

good1, access_ts = pcall( lang.formatDate, lang, 'U', accessdate ); -- convert accessdate value to unix timesatmp

good2, tomorrow_ts = pcall( lang.formatDate, lang, 'U', 'today + 2 days' ); -- today midnight + 2 days is one second more than all day tomorrow

if good1 and good2 then

access_ts = tonumber (access_ts); -- convert to numbers for the comparison

tomorrow_ts = tonumber (tomorrow_ts);

else

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;

else

return false; -- accessdate out of range

end

--[[--------------------------< G E T _ M O N T H _ N U M B E R >----------------------------------------------

returns a number according to the month in a date: 1 for January, etc. Capitalization and spelling must be correct. If not a valid month, returns 0

]]

local function get_month_number (month)

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};

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end

-- returns a number according to the sequence of seasons in a year: 1 for Winter, etc. Capitalization and spelling must be correct. If not a valid season, returns 0

--[[--------------------------< G E T _ S E A S O N _ N U M B E R >--------------------------------------------

returns a number according to the sequence of seasons in a year: 1 for Winter, etc. Capitalization and spelling must be correct. If not a valid season, returns 0

]]

local function get_season_number (season)

local season_list = {['Winter']=1, ['Spring']=2, ['Summer']=3, ['Fall']=4, ['Autumn']=4}

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return 0; -- misspelled, improper case, or not a season name

end

--[[--------------------------< I S _ P R O P E R _ N A M E >--------------------------------------------------

returns a non-zero number if date contains a recognized proper name. Capitalization and spelling must be correct.

]]

local function is_proper_name (name)

local name_list = {['Christmas']=1}

local temp;

temp=name_list[name];

if temp then return temp; end -- if name is a valid name return its number

return 0; -- misspelled, improper case, or not a proper name

end

--[[--------------------------< I S _ V A L I D _ M O N T H _ O R _ S E A S O N >------------------------------

--returns true if month or season is valid (properly spelled, capitalized, abbreviated)

]]

local function is_valid_month_or_season (month_season)

if 0 == get_month_number (month_season) then -- if month text isn't one of the twelve months, might be a season

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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 three

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end

elseif date_string:match("^%a+ +%d%d%d%d%a?$") then -- month/season year

elseif date_string:match("^%a+ +%d%d%d%d%a?$") then -- month/season year or proper-name year

month, anchor_year, year=date_string:match("(%a+)%s*((%d%d%d%d)%a?)");

if not is_valid_year(year) then return false; end

if not is_valid_month_or_season (month) then return false; end

if not is_valid_month_or_season (month) and 0 == is_proper_name (month) then return false; end

elseif date_string:match("^[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

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else

good_date, anchor_year, COinS_date = check_date (v); -- go test the date

end

elseif 'accessdate'==k then -- if the parameter is |date=

good_date = check_date (v); -- go test the date

if true == good_date then -- if the date is a valid date

good_date = is_valid_accessdate (v); -- is Wikipedia start date < accessdate < tomorrow's date?

end

else -- any other date-holding parameter