“模块:Citation/CS1/Date validation”的版本间的差异

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排队论>Trappist the monk
(update per RfC;)
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--[[--------------------------< F O R W A R D  D E C L A R A T I O N S >--------------------------------------
 
--[[--------------------------< 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 functions from selected Module:Citation/CS1/Utilities
+
local add_prop_cat, is_set, in_array, set_message, substitute, wrap_style; -- imported functions from selected Module:Citation/CS1/Utilities
 
local cfg; -- table of tables imported from selected Module:Citation/CS1/Configuration
 
local cfg; -- table of tables imported from selected Module:Citation/CS1/Configuration
  
第23行: 第22行:
  
 
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)
 
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
+
accessdate is the date provided in |access-date= at time 00:00:00 UTC
 
today is the current date at time 00:00:00 UTC plus 48 hours
 
today is the current date at time 00:00:00 UTC plus 48 hours
 
if today is 2015-01-01T00:00:00 then
 
if today is 2015-01-01T00:00:00 then
第30行: 第29行:
  
 
This function does not work if it is fed month names for languages other than English.  Wikimedia #time: parser
 
This function does not work if it is fed month names for languages other than English.  Wikimedia #time: parser
apparently doesn't understand non-Engish date month names. This function will always return false when the date
+
apparently doesn't understand non-English date month names. This function will always return false when the date
 
contains a non-English month name because good1 is false after the call to lang.formatDate().  To get around that
 
contains a non-English month name because good1 is false after the call to lang.formatDate().  To get around that
 
call this function with YYYY-MM-DD format dates.
 
call this function with YYYY-MM-DD format dates.
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local function is_valid_accessdate (accessdate)
 
local function is_valid_accessdate (accessdate)
 
local good1, good2;
 
local good1, good2;
local access_ts, tomorrow_ts; -- to hold unix time stamps representing the dates
+
local access_ts, tomorrow_ts; -- to hold Unix time stamps representing the dates
  
good1, access_ts = pcall (lang_object.formatDate, lang_object, 'U', accessdate ); -- convert accessdate value to unix timesatmp
+
good1, access_ts = pcall (lang_object.formatDate, lang_object, 'U', accessdate ); -- convert accessdate value to Unix timestamp
 
good2, tomorrow_ts = pcall (lang_object.formatDate, lang_object, 'U', 'today + 2 days' ); -- today midnight + 2 days is one second more than all day tomorrow
 
good2, tomorrow_ts = pcall (lang_object.formatDate, lang_object, 'U', 'today + 2 days' ); -- today midnight + 2 days is one second more than all day tomorrow
 
 
 
if good1 and good2 then -- lang.formatDate() returns a timestamp in the local script which which tonumber() may not understand
 
if good1 and good2 then -- lang.formatDate() returns a timestamp in the local script which which tonumber() may not understand
access_ts = tonumber (access_ts) or lang_object:parseFormattedNumber (access_ts); -- convert to numbers for the comparison;
+
access_ts = tonumber (access_ts) or lang_object:parseFormattedNumber (access_ts); -- convert to numbers for the comparison;
 
tomorrow_ts = tonumber (tomorrow_ts) or lang_object:parseFormattedNumber (tomorrow_ts);
 
tomorrow_ts = tonumber (tomorrow_ts) or lang_object:parseFormattedNumber (tomorrow_ts);
 
else
 
else
return false; -- one or both failed to convert to unix time stamp
+
return false; -- one or both failed to convert to Unix time stamp
 
end
 
end
  
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--[[--------------------------< G E T _ M O N T H _ N U M B E R >----------------------------------------------
 
--[[--------------------------< 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
+
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 function get_month_number (month)
return cfg.date_names['local'].long[month] or cfg.date_names['local'].short[month] or -- look for local names first
+
return cfg.date_names['local'].long[month] or cfg.date_names['local'].short[month] or -- look for local names first
cfg.date_names['en'].long[month] or cfg.date_names['en'].short[month] or -- failing that, look for English names
+
cfg.date_names['en'].long[month] or cfg.date_names['en'].short[month] or -- failing that, look for English names
0; -- not a recognized month name
+
0; -- not a recognized month name
 
end
 
end
  
  
--[[--------------------------< I S _ V A L I D _ E M B A R G O _ D A T E >------------------------------------
+
--[[--------------------------< 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: 21 for Spring, etc.  Capitalization and spelling
 +
must be correct. If not a valid season, returns 0.
 +
21-24 = Spring, Summer, Autumn, Winter, independent of “Hemisphere”
  
returns true and date value if that value has proper dmy, mdy, ymd format.
+
returns 0 when <param> is not |date=
  
returns false and 9999 (embargoed forever) when date value is not proper format; assumes that when |embargo= is
+
Season numbering is defined by Extended Date/Time Format (EDTF) specification (https://www.loc.gov/standards/datetime/)
set, the editor intended to embargo a pmc but |embargo= does not hold a single date.
+
which became part of ISO 8601 in 2019.  See '§Sub-year groupings'.  The standard defines various divisions using
 +
numbers 21-41.  cs1|2 only supports generic seasons.  EDTF does support the distinction between north and south
 +
hemisphere seasons but cs1|2 has no way to make that distinction.
 +
 
 +
These additional divisions not currently supported:
 +
25-28 = Spring - Northern Hemisphere, Summer- Northern Hemisphere, Autumn - Northern Hemisphere, Winter - Northern Hemisphere
 +
29-32 = Spring – Southern Hemisphere, Summer– Southern Hemisphere, Autumn – Southern Hemisphere, Winter - Southern Hemisphere
 +
33-36 = Quarter 1, Quarter 2, Quarter 3, Quarter 4 (3 months each)
 +
37-39 = Quadrimester 1, Quadrimester 2, Quadrimester 3 (4 months each)
 +
40-41 = Semestral 1, Semestral-2 (6 months each)
  
 
]]
 
]]
  
local function is_valid_embargo_date (v)
+
local function get_season_number (season, param)
if v:match ('^%d%d%d%d%-%d%d%-%d%d$') or -- ymd
+
if 'date' ~= param then
v:match ('^%d%d?%s+%a+%s+%d%d%d%d$') or -- dmy
+
return 0; -- season dates only supported by |date=
v:match ('^%a+%s+%d%d?%s*,%s*%d%d%d%d$') then -- mdy
 
return true, v;
 
 
end
 
end
return false, '9999'; -- if here not good date so return false and set embargo date to long time in future
+
return cfg.date_names['local'].season[season] or -- look for local names first
 +
cfg.date_names['en'].season[season] or -- failing that, look for English names
 +
0; -- not a recognized season name
 
end
 
end
  
  
--[[--------------------------< G E T _ S E A S O N _ N U M B E R >--------------------------------------------
+
--[[--------------------------< G E T _ Q U A R T E R _ N U M B E R >------------------------------------------
 +
 
 +
returns a number according to the sequence of quarters in a year: 33 for first quarter, etc.  Capitalization and spelling
 +
must be correct. If not a valid quarter, returns 0.
 +
33-36 = Quarter 1, Quarter 2, Quarter 3, Quarter 4 (3 months each)
  
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
+
returns 0 when <param> is not |date=
  
Uses ISO DIS 8601 2016 part 2 §4.7 Divisions of a year for hemishpere-independent seasons:
+
Quarter numbering is defined by Extended Date/Time Format (EDTF) specification (https://www.loc.gov/standards/datetime/)
21-24 = Spring, Summer, Autumn, Winter, independent of “Hemisphere”
+
which became part of ISO 8601 in 2019See '§Sub-year groupings'.  The standard defines various divisions using
 +
numbers 21-41.  cs1|2 only supports generic seasons and quarters.
  
 
These additional divisions not currently supported:
 
These additional divisions not currently supported:
25-28 = Spring - Northern Hemisphere, Summer- Northern Hemisphere, Autumn - Northern Hemisphere, Winter - Northern Hemisphere
 
29-32 = Spring – Southern Hemisphere, Summer– Southern Hemisphere, Autumn – Southern Hemisphere, Winter - Southern Hemisphere
 
33-36 = Quarter 1, Quarter 2, Quarter 3, Quarter 4 (3 months each)
 
 
37-39 = Quadrimester 1, Quadrimester 2, Quadrimester 3 (4 months each)
 
37-39 = Quadrimester 1, Quadrimester 2, Quadrimester 3 (4 months each)
 
40-41 = Semestral 1, Semestral-2 (6 months each)
 
40-41 = Semestral 1, Semestral-2 (6 months each)
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]]
 
]]
  
local function get_season_number (season)
+
local function get_quarter_number (quarter, param)
return cfg.date_names['local'].season[season] or -- look for local names first
+
if 'date' ~= param then
cfg.date_names['en'].season[season] or -- failing that, look for English names
+
return 0; -- quarter dates only supported by |date=
0; -- not a recognized season name
+
end
 +
quarter = mw.ustring.gsub (quarter, ' +', ' '); -- special case replace multiple space chars with a single space char
 +
return cfg.date_names['local'].quarter[quarter] or -- look for local names first
 +
cfg.date_names['en'].quarter[quarter] or -- failing that, look for English names
 +
0; -- not a recognized quarter name
 
end
 
end
  
  
--[[--------------------------< I S _ P R O P E R _ N A M E >--------------------------------------------------
+
--[[--------------------------< G E T _ P R O P E R _ N A M E _ N U M B E R >----------------------------------
  
returns a non-zero number if date contains a recognized proper name.  Capitalization and spelling must be correct.
+
returns a non-zero number if date contains a recognized proper-name.  Capitalization and spelling must be correct.
 +
 
 +
returns 0 when <param> is not |date=
  
 
]]
 
]]
  
local function is_proper_name (name)
+
local function get_proper_name_number (name, param)
 +
if 'date' ~= param then
 +
return 0; -- proper-name dates only supported by |date=
 +
end
 
return cfg.date_names['local'].named[name] or -- look for local names dates first
 
return cfg.date_names['local'].named[name] or -- look for local names dates first
 
cfg.date_names['en'].named[name] or -- failing that, look for English names
 
cfg.date_names['en'].named[name] or -- failing that, look for English names
第126行: 第150行:
  
  
--[[--------------------------< I S _ V A L I D _ M O N T H _ O R _ S E A S O N >------------------------------
+
--[[--------------------------< G E T _ E L E M E N T _ N U M B E R <------------------------------------------
  
--returns true if month or season is valid (properly spelled, capitalized, abbreviated)
+
returns true if month or season or quarter or proper name is valid (properly spelled, capitalized, abbreviated)
  
 
]]
 
]]
  
local function is_valid_month_or_season (month_season)
+
local function get_element_number (element, param)
if 0 == get_month_number (month_season) then -- if month text isn't one of the twelve months, might be a season
+
local num;
if 0 == get_season_number (month_season) then -- not a month, is it a season?
+
return false; -- return false not a month or one of the five seasons
+
local funcs = {get_month_number, get_season_number, get_quarter_number, get_proper_name_number}; -- list of functions to execute in order
 +
 +
for _, func in ipairs (funcs) do -- spin through the function list
 +
num = func (element, param); -- call the function and get the returned number
 +
if 0 ~= num then -- non-zero when valid month season quarter
 +
return num; -- return that number
 
end
 
end
 
end
 
end
return true;
+
return nil; -- not valid
 
end
 
end
  
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--[[--------------------------< I S _ V A L I D _ Y E A R >----------------------------------------------------
 
--[[--------------------------< I S _ V A L I D _ Y E A R >----------------------------------------------------
  
Function gets current year from the server and compares it to year from a citation parameter.  Years more than one year in the future are not acceptable.
+
Function gets current year from the server and compares it to year from a citation parameter.  Years more than one
 +
year in the future are not acceptable.
 +
 
 +
Special case for |pmc-embargo-date=: years more than two years in the future are not acceptable
  
 
]]
 
]]
  
local function is_valid_year(year)
+
local function is_valid_year (year, param)
if not is_set(year_limit) then
+
if not is_set (year_limit) then
 
year_limit = tonumber(os.date("%Y"))+1; -- global variable so we only have to fetch it once
 
year_limit = tonumber(os.date("%Y"))+1; -- global variable so we only have to fetch it once
 
end
 
end
  
year = tonumber (year) or lang_object:parseFormattedNumber (year); -- convert to numbers for the comparison;
+
year = tonumber (year) or lang_object:parseFormattedNumber (year); -- convert to number for the comparison;
 +
 +
if 'pmc-embargo-date' == param then -- special case for |pmc-embargo-date=
 +
return year and (year <= tonumber(os.date("%Y"))+2) or false; -- years more than two years in the future are not accepted
 +
end
 
return year and (year <= year_limit) or false;
 
return year and (year <= year_limit) or false;
 
end
 
end
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--[[--------------------------< I S _ V A L I D _ D A T E >----------------------------------------------------
 
--[[--------------------------< 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
 
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.
 
than next year; else returns false.
第168行: 第205行:
 
]]
 
]]
  
local function is_valid_date (year, month, day)
+
local function is_valid_date (year, month, day, param)
 
local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
local month_length;
 
local month_length;
if not is_valid_year(year) then -- no farther into the future than next year
+
if not is_valid_year (year, param) then -- no farther into the future than next year except |pmc-embargo-date= no more than two years in the future
 
return false;
 
return false;
 
end
 
end
 
 
month = tonumber(month); -- required for YYYY-MM-DD dates
+
month = tonumber (month); -- required for YYYY-MM-DD dates
 
 
if (2==month) then -- if February
+
if (2 == month) then -- if February
 
month_length = 28; -- then 28 days unless
 
month_length = 28; -- then 28 days unless
 
if 1582 > tonumber(year) then -- Julian calendar
 
if 1582 > tonumber(year) then -- Julian calendar
if 0==(year%4) then -- is a leap year?
+
if 0 == (year%4) then -- is a leap year?
 
month_length = 29; -- if leap year then 29 days in February
 
month_length = 29; -- if leap year then 29 days in February
 
end
 
end
 
else -- Gregorian calendar
 
else -- Gregorian calendar
if (0==(year%4) and (0~=(year%100) or 0==(year%400))) then -- is a leap year?
+
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
 
month_length = 29; -- if leap year then 29 days in February
 
end
 
end
 
end
 
end
 
else
 
else
month_length=days_in_month[month];
+
month_length = days_in_month[month];
 
end
 
end
  
第202行: 第239行:
  
 
Months in a range are expected to have the same style: Jan–Mar or October–December but not February–Mar or Jul–August.  
 
Months in a range are expected to have the same style: Jan–Mar or October–December but not February–Mar or Jul–August.  
There is a special test for May because it can be either short or long form.
+
This function looks in cfg.date_names{} to see if both month names are listed in the long subtable or both are
 
+
listed in the short subtable. When both have the same style (both are listed in the same table), returns true; false else
Returns true when style for both months is the same
 
  
 
]]
 
]]
  
 
local function is_valid_month_range_style (month1, month2)
 
local function is_valid_month_range_style (month1, month2)
local len1 = month1:len();
+
if (cfg.date_names.en.long[month1] and cfg.date_names.en.long[month2]) or -- are both English names listed in the long subtable?
local len2 = month2:len();
+
(cfg.date_names.en.short[month1] and cfg.date_names.en.short[month2]) or -- are both English names listed in the short subtable?
if len1 == len2 then
+
(cfg.date_names['local'].long[month1] and cfg.date_names['local'].long[month2]) or -- are both local names listed in the long subtable?
return true; -- both months are short form so return true
+
(cfg.date_names['local'].short[month1] and cfg.date_names['local'].short[month2]) then -- are both local names listed in the short subtable?
elseif 'May' == month1 or 'May'== month2 then
+
return true;
return true; -- both months are long form so return true
 
elseif 3 == len1 or 3 == len2 then
 
return false; -- months are mixed form so return false
 
else
 
return true; -- both months are long form so return true
 
 
end
 
end
 +
return false; -- names are mixed
 
end
 
end
  
第229行: 第261行:
 
Month pairs are expected to be left to right, earliest to latest in time.
 
Month pairs are expected to be left to right, earliest to latest in time.
  
All season ranges are accepted as valid because there are publishers out there who have published a Summer–Spring YYYY issue so ... ok
+
All season ranges are accepted as valid because there are publishers out there who have published a Summer–Spring YYYY issue, hence treat as ok
  
 
]]
 
]]
  
local function is_valid_month_season_range(range_start, range_end)
+
local function is_valid_month_season_range(range_start, range_end, param)
 
local range_start_number = get_month_number (range_start);
 
local range_start_number = get_month_number (range_start);
 
local range_end_number;
 
local range_end_number;
+
 
 
if 0 == range_start_number then -- is this a month range?
 
if 0 == range_start_number then -- is this a month range?
range_start_number = get_season_number (range_start); -- not a month; is it a season? get start season number
+
range_start_number = get_season_number (range_start, param); -- not a month; is it a season? get start season number
range_end_number = get_season_number (range_end); -- get end season number
+
range_end_number = get_season_number (range_end, param); -- get end season number
  
if (0 ~= range_start_number) and (0 ~= range_end_number) then
+
if (0 ~= range_start_number) and (0 ~= range_end_number) and (range_start_number ~= range_end_number) then
return true; -- any season pairing is accepted
+
return true; -- any season pairing is accepted except when both are the same
 
end
 
end
 
return false; -- range_start and/or range_end is not a season
 
return false; -- range_start and/or range_end is not a season
第248行: 第280行:
 
-- here when range_start is a month
 
-- here when range_start is a month
 
range_end_number = get_month_number (range_end); -- get end month number
 
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 range_start_number < range_end_number and -- 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?
+
is_valid_month_range_style (range_start, range_end) then -- do months have the same style?
 
return true; -- proper order and same style
 
return true; -- proper order and same style
end
 
 
end
 
end
 
return false; -- range_start month number is greater than or equal to range end number; or range end isn't a month
 
return false; -- range_start month number is greater than or equal to range end number; or range end isn't a month
第280行: 第311行:
 
 
 
the output table receives:
 
the output table receives:
rftdate: an IS8601 formatted date
+
rftdate: an ISO 8601 formatted date
rftchron: a free-form version of the date, usually without year which is in rftdate (season ranges and propername dates)
+
rftchron: a free-form version of the date, usually without year which is in rftdate (season ranges and proper-name dates)
 
rftssn: one of four season keywords: winter, spring, summer, fall (lowercase)
 
rftssn: one of four season keywords: winter, spring, summer, fall (lowercase)
 +
rftquarter: one of four values: 1, 2, 3, 4
  
 
]]
 
]]
第294行: 第326行:
 
local day = tonumber (input.day);
 
local day = tonumber (input.day);
 
if (0 ~= day) and -- day must have a value for this to be a whole date
 
if (0 ~= day) and -- day must have a value for this to be a whole date
(((1582 == year) and (10 <= month) and (12 >= month)) or -- any whole 1582 date from 1 october to 31 December or
+
(((1582 == year) and (10 <= month) and (12 >= month)) or -- any whole 1582 date from 1 October to 31 December or
 
((1926 == year) and (1 == month) and (1 == input.day)) or -- 1 January 1926 or
 
((1926 == year) and (1 == month) and (1 == input.day)) or -- 1 January 1926 or
 
((1582 < year) and (1925 >= year))) then -- any date 1 January 1583 – 31 December 1925
 
((1582 < year) and (1925 >= year))) then -- any date 1 January 1583 – 31 December 1925
 
tCOinS_date.inter_cal_cat = true; -- set category flag true
 
tCOinS_date.inter_cal_cat = true; -- set category flag true
 
end
 
end
-- end temporary Julian / Gergorian calendar uncertainty detection
+
-- end temporary Julian / Gregorian calendar uncertainty detection
 
 
 
if 1582 > tonumber(input.year) or 20 < tonumber(input.month) then -- Julian calendar or season so &rft.date gets year only
 
if 1582 > tonumber(input.year) or 20 < tonumber(input.month) then -- Julian calendar or season so &rft.date gets year only
第306行: 第338行:
 
date = string.format ('%.4d/%.4d', tonumber(input.year), tonumber(input.year2)) -- assemble the date range
 
date = string.format ('%.4d/%.4d', tonumber(input.year), tonumber(input.year2)) -- assemble the date range
 
end
 
end
if 20 < tonumber(input.month) then -- if season or propername date
+
if 20 < tonumber(input.month) then -- if season or proper-name date
local season = {[24]='winter', [21]='spring', [22]='summer', [23]='fall', [99]='Christmas'}; -- seasons lowercase, no autumn; proper names use title case
+
local season = {[24] = 'winter', [21] = 'spring', [22] = 'summer', [23] = 'fall', [33] = '1', [34] = '2', [35] = '3', [36] = '4', [98] = 'Easter', [99] = 'Christmas'}; -- seasons lowercase, no autumn; proper-names use title case
 
if 0 == input.month2 then -- single season date
 
if 0 == input.month2 then -- single season date
if 30 <tonumber(input.month) then
+
if 40 < tonumber(input.month) then
tCOinS_date.rftchron = season[input.month]; -- proper name dates
+
tCOinS_date.rftchron = season[input.month]; -- proper-name dates
 +
elseif 30 < tonumber(input.month) then
 +
tCOinS_date.rftquarter = season[input.month]; -- quarters
 
else
 
else
 
tCOinS_date.rftssn = season[input.month]; -- seasons
 
tCOinS_date.rftssn = season[input.month]; -- seasons
第373行: 第407行:
 
['Md-dy'] = {'^(%D-) +([1-9]%d?)[%-–]([1-9]%d?), +((%d%d%d%d)%a?)$', 'm', 'd', 'd2', 'a', 'y'},
 
['Md-dy'] = {'^(%D-) +([1-9]%d?)[%-–]([1-9]%d?), +((%d%d%d%d)%a?)$', 'm', 'd', 'd2', 'a', 'y'},
 
-- day-initial: day month year
 
-- day-initial: day month year
['dMy'] = {'^([1-9]%d?) *(%D-) +((%d%d%d%d?)%a?)$', 'd', 'm', 'a', 'y'},
+
['dMy'] = {'^([1-9]%d?) +(%D-) +((%d%d%d%d?)%a?)$', 'd', 'm', 'a', 'y'},
 
-- year-initial: year month day; day: 1 or 2 two digits, leading zero allowed; not supported at en.wiki
 
-- year-initial: year month day; day: 1 or 2 two digits, leading zero allowed; not supported at en.wiki
-- ['yMd'] = {'^((%d%d%d%d?)%a?) +(%D-) +(%d%d?)$', 'a', 'y', 'm', 'd'},
+
-- ['yMd'] = {'^((%d%d%d%d?)%a?) +(%D-) +(%d%d?)$', 'a', 'y', 'm', 'd'},
 
-- day-range-initial: day–day month year; days are separated by endash
 
-- day-range-initial: day–day month year; days are separated by endash
 
['d-dMy'] = {'^([1-9]%d?)[%-–]([1-9]%d?) +(%D-) +((%d%d%d%d)%a?)$', 'd', 'd2', 'm', 'a', 'y'},
 
['d-dMy'] = {'^([1-9]%d?)[%-–]([1-9]%d?) +(%D-) +((%d%d%d%d)%a?)$', 'd', 'd2', 'm', 'a', 'y'},
第392行: 第426行:
 
-- month/season range year; months separated by endash
 
-- month/season range year; months separated by endash
 
['M-My'] = {'^(%D-)[%-–](%D-) +((%d%d%d%d)%a?)$', 'm', 'm2', 'a', 'y'},
 
['M-My'] = {'^(%D-)[%-–](%D-) +((%d%d%d%d)%a?)$', 'm', 'm2', 'a', 'y'},
-- month/season year or proper-name year
+
-- month/season year or proper-name year; quarter year when First Quarter YYYY etc.
 
['My'] = {'^([^%d–]-) +((%d%d%d%d)%a?)$', 'm', 'a', 'y'}, -- this way because endash is a member of %D; %D- will match January–March 2019 when it shouldn't
 
['My'] = {'^([^%d–]-) +((%d%d%d%d)%a?)$', 'm', 'a', 'y'}, -- this way because endash is a member of %D; %D- will match January–March 2019 when it shouldn't
 +
 
-- these date formats cannot be converted
 
-- these date formats cannot be converted
 
['Sy4-y2'] = {'^(%D-) +((%d%d)%d%d)[%-–]((%d%d)%a?)$'}, -- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash
 
['Sy4-y2'] = {'^(%D-) +((%d%d)%d%d)[%-–]((%d%d)%a?)$'}, -- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash
第401行: 第436行:
 
['y'] = {'^((%d%d%d%d?)%a?)$'}, -- year; here accept either YYY or YYYY
 
['y'] = {'^((%d%d%d%d?)%a?)$'}, -- year; here accept either YYY or YYYY
 
}
 
}
 +
 +
 +
--[[--------------------------< 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 |pmc-embargo-date= is
 +
set, the editor intended to embargo a PMC but |pmc-embargo-date= does not hold a single date.
 +
 +
]]
 +
 +
local function is_valid_embargo_date (v)
 +
if v:match (patterns['ymd'][1]) or -- ymd
 +
v:match (patterns['Mdy'][1]) or -- dmy
 +
v:match (patterns['dMy'][1]) 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
  
  
第411行: 第465行:
  
 
If the date fails the format tests, this function returns false and does not return values for anchor_year and
 
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 is used in the COinS metadata and the CITEREF identifier gets
+
COinS_date.  When this happens, the date parameter is (DEBUG: not?) used 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.
 
its year from the year parameter if present otherwise CITEREF does not get a date value.
  
 
Inputs:
 
Inputs:
date_string - date string from date-holding parameters (date, year, accessdate, embargo, archivedate, etc.)
+
date_string - date string from date-holding parameters (date, year, publication-date, access-date, pmc-embargo-date, archive-date, lay-date)
  
 
Returns:
 
Returns:
第425行: 第479行:
 
]]
 
]]
  
local function check_date (date_string, tCOinS_date, test_accessdate)
+
local function check_date (date_string, param, tCOinS_date)
local year; -- assume that year2, months, and days are not used;
+
local year; -- assume that year2, months, and days are not used;
local year2=0; -- second year in a year range
+
local year2 = 0; -- second year in a year range
local month=0;
+
local month = 0;
local month2=0; -- second month in a month range
+
local month2 = 0; -- second month in a month range
local day=0;
+
local day = 0;
local day2=0; -- second day in a day range
+
local day2 = 0; -- second day in a day range
 
local anchor_year;
 
local anchor_year;
 
local coins_date;
 
local coins_date;
  
 
if date_string:match (patterns['ymd'][1]) then -- year-initial numerical year month day format
 
if date_string:match (patterns['ymd'][1]) then -- year-initial numerical year month day format
year, month, day=date_string:match (patterns['ymd'][1]);
+
year, month, day = date_string:match (patterns['ymd'][1]);
 
if 12 < tonumber(month) or 1 > tonumber(month) or 1582 > tonumber(year) or 0 == tonumber(day) then return false; end -- month or day number not valid or not Gregorian calendar
 
if 12 < tonumber(month) or 1 > tonumber(month) or 1582 > tonumber(year) or 0 == tonumber(day) then return false; end -- month or day number not valid or not Gregorian calendar
 
anchor_year = year;
 
anchor_year = year;
 
 
 
elseif mw.ustring.match(date_string, patterns['Mdy'][1]) then -- month-initial: month day, year
 
elseif mw.ustring.match(date_string, patterns['Mdy'][1]) then -- month-initial: month day, year
month, day, anchor_year, year=mw.ustring.match(date_string, patterns['Mdy'][1]);
+
month, day, anchor_year, year = mw.ustring.match(date_string, patterns['Mdy'][1]);
 
month = get_month_number (month);
 
month = get_month_number (month);
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
 
 
elseif mw.ustring.match(date_string, patterns['Md-dy'][1]) then -- month-initial day range: month day–day, year; days are separated by endash
 
elseif mw.ustring.match(date_string, patterns['Md-dy'][1]) then -- month-initial day range: month day–day, year; days are separated by endash
month, day, day2, anchor_year, year=mw.ustring.match(date_string, patterns['Md-dy'][1]);
+
month, day, day2, anchor_year, year = mw.ustring.match(date_string, patterns['Md-dy'][1]);
 
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;
 
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);
 
month = get_month_number (month);
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
month2=month; -- for metadata
 
month2=month; -- for metadata
year2=year;
+
year2 = year;
  
 
elseif mw.ustring.match(date_string, patterns['dMy'][1]) then -- day-initial: day month year
 
elseif mw.ustring.match(date_string, patterns['dMy'][1]) then -- day-initial: day month year
day, month, anchor_year, year=mw.ustring.match(date_string, patterns['dMy'][1]);
+
day, month, anchor_year, year = mw.ustring.match(date_string, patterns['dMy'][1]);
 
month = get_month_number (month);
 
month = get_month_number (month);
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
第460行: 第514行:
 
--[[ NOT supported at en.wiki
 
--[[ NOT supported at en.wiki
 
elseif mw.ustring.match(date_string, patterns['yMd'][1]) then -- year-initial: year month day; day: 1 or 2 two digits, leading zero allowed
 
elseif mw.ustring.match(date_string, patterns['yMd'][1]) then -- year-initial: year month day; day: 1 or 2 two digits, leading zero allowed
anchor_year, year, month, day=mw.ustring.match(date_string, patterns['yMd'][1]);
+
anchor_year, year, month, day = mw.ustring.match(date_string, patterns['yMd'][1]);
 
month = get_month_number (month);
 
month = get_month_number (month);
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
第466行: 第520行:
  
 
elseif mw.ustring.match(date_string, patterns['d-dMy'][1]) then -- day-range-initial: day–day month year; days are separated by endash
 
elseif mw.ustring.match(date_string, patterns['d-dMy'][1]) then -- day-range-initial: day–day month year; days are separated by endash
day, day2, month, anchor_year, year=mw.ustring.match(date_string, patterns['d-dMy'][1]);
+
day, day2, month, anchor_year, year = mw.ustring.match(date_string, patterns['d-dMy'][1]);
 
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;
 
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);
 
month = get_month_number (month);
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
 
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
month2=month; -- for metadata
+
month2 = month; -- for metadata
year2=year;
+
year2 = year;
  
 
elseif mw.ustring.match(date_string, patterns['dM-dMy'][1]) then -- day initial month-day-range: day month - day month year; uses spaced endash
 
elseif mw.ustring.match(date_string, patterns['dM-dMy'][1]) then -- day initial month-day-range: day month - day month year; uses spaced endash
day, month, day2, month2, anchor_year, year=mw.ustring.match(date_string, patterns['dM-dMy'][1]);
+
day, month, day2, month2, anchor_year, year = mw.ustring.match(date_string, patterns['dM-dMy'][1]);
 
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;
 
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
 
month = get_month_number (month); -- for metadata
 
month2 = get_month_number (month2);
 
month2 = get_month_number (month2);
year2=year;
+
year2 = year;
  
elseif mw.ustring.match(date_string, patterns['Md-Mdy'][1]) then -- month initial month-day-range: month day – month day, year; uses spaced endash
+
elseif mw.ustring.match(date_string, patterns['Md-Mdy'][1]) then -- month initial month-day-range: month day – month day, year; uses spaced endash
month, day, month2, day2, anchor_year, year=mw.ustring.match(date_string, patterns['Md-Mdy'][1]);
+
month, day, month2, day2, anchor_year, year = mw.ustring.match(date_string, patterns['Md-Mdy'][1]);
if (not is_valid_month_season_range(month, month2)) or not is_valid_year(year) then return false; end
+
if (not is_valid_month_season_range(month, month2, param)) or not is_valid_year(year) then return false; end
 
month = get_month_number (month); -- for metadata
 
month = get_month_number (month); -- for metadata
 
month2 = get_month_number (month2);
 
month2 = get_month_number (month2);
year2=year;
+
year2 = year;
  
 
elseif mw.ustring.match(date_string, patterns['dMy-dMy'][1]) then -- day initial month-day-year-range: day month year - day month year; uses spaced endash
 
elseif mw.ustring.match(date_string, patterns['dMy-dMy'][1]) then -- day initial month-day-year-range: day month year - day month year; uses spaced endash
day, month, year, day2, month2, anchor_year, year2=mw.ustring.match(date_string, patterns['dMy-dMy'][1]);
+
day, month, year, day2, month2, anchor_year, year2 = mw.ustring.match(date_string, patterns['dMy-dMy'][1]);
 
if tonumber(year2) <= tonumber(year) then return false; end -- must be sequential years, left to right, earlier to later
 
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
 
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
 
month = get_month_number (month); -- for metadata
 
month2 = get_month_number (month2);
 
month2 = get_month_number (month2);
 +
if 0 == month or 0 == month2 then return false; end -- both must be valid
  
elseif mw.ustring.match(date_string, patterns['Mdy-Mdy'][1]) then -- month initial month-day-year-range: month day, year – month day, year; uses spaced endash
+
elseif mw.ustring.match(date_string, patterns['Mdy-Mdy'][1]) then -- month initial month-day-year-range: month day, year – month day, year; uses spaced endash
month, day, year, month2, day2, anchor_year, year2=mw.ustring.match(date_string, patterns['Mdy-Mdy'][1]);
+
month, day, year, month2, day2, anchor_year, year2 = mw.ustring.match(date_string, patterns['Mdy-Mdy'][1]);
 
if tonumber(year2) <= tonumber(year) then return false; end -- must be sequential years, left to right, earlier to later
 
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
 
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
 
month = get_month_number (month); -- for metadata
month2 = get_month_number (month2);
+
month2 = get_month_number(month2);
 +
if 0 == month or 0 == month2 then return false; end -- both must be valid
  
 
elseif mw.ustring.match(date_string, patterns['Sy4-y2'][1]) then -- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash
 
elseif mw.ustring.match(date_string, patterns['Sy4-y2'][1]) then -- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash
 
local century;
 
local century;
month, year, century, anchor_year, year2=mw.ustring.match(date_string, patterns['Sy4-y2'][1]);
+
month, year, century, anchor_year, year2 = mw.ustring.match(date_string, patterns['Sy4-y2'][1]);
 
if 'Winter' ~= month and 'Summer' ~= month then return false end; -- 'month' can only be Winter or Summer
 
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
+
anchor_year = year .. '–' .. anchor_year; -- assemble anchor_year from both years
 
year2 = century..year2; -- add the century to year2 for comparisons
 
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 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
 
if not is_valid_year(year2) then return false; end -- no year farther in the future than next year
month = get_season_number (month);
+
month = get_season_number(month, param);
  
 
elseif mw.ustring.match(date_string, patterns['Sy-y'][1]) then -- special case Winter/Summer year-year; year separated with unspaced endash
 
elseif mw.ustring.match(date_string, patterns['Sy-y'][1]) then -- special case Winter/Summer year-year; year separated with unspaced endash
month, year, anchor_year, year2=mw.ustring.match(date_string, patterns['Sy-y'][1]);
+
month, year, anchor_year, year2 = mw.ustring.match(date_string, patterns['Sy-y'][1]);
 
if 'Winter' ~= month and 'Summer' ~= month then return false end; -- 'month' can only be Winter or Summer
 
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
+
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 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
 
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
+
month = get_season_number (month, param); -- for metadata
  
 
elseif mw.ustring.match(date_string, patterns['My-My'][1]) then -- month/season year - month/season year; separated by spaced endash
 
elseif mw.ustring.match(date_string, patterns['My-My'][1]) then -- month/season year - month/season year; separated by spaced endash
month, year, month2, anchor_year, year2=mw.ustring.match(date_string, patterns['My-My'][1]);
+
month, year, month2, anchor_year, year2 = mw.ustring.match(date_string, patterns['My-My'][1]);
anchor_year=year..'–'..anchor_year; -- assemble anchor_year from both years
+
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 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 is_valid_year(year2) then return false; end -- no year farther in the future than next year
第527行: 第583行:
 
month = get_month_number(month);
 
month = get_month_number(month);
 
month2 = get_month_number(month2);
 
month2 = get_month_number(month2);
elseif 0 ~= get_season_number(month) and 0 ~= get_season_number(month2) then -- both must be or season year, not mixed
+
elseif 0 ~= get_season_number(month, param) and 0 ~= get_season_number(month2, param) then -- both must be season year, not mixed
month = get_season_number(month);
+
month = get_season_number(month, param);
month2 = get_season_number(month2);
+
month2 = get_season_number(month2, param);
 
else
 
else
 
return false;
 
return false;
第535行: 第591行:
  
 
elseif mw.ustring.match(date_string, patterns['M-My'][1]) then -- month/season range year; months separated by endash  
 
elseif mw.ustring.match(date_string, patterns['M-My'][1]) then -- month/season range year; months separated by endash  
month, month2, anchor_year, year=mw.ustring.match(date_string, patterns['M-My'][1]);
+
month, month2, anchor_year, year = mw.ustring.match(date_string, patterns['M-My'][1]);
if (not is_valid_month_season_range(month, month2)) or (not is_valid_year(year)) then return false; end
+
if (not is_valid_month_season_range(month, month2, param)) 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
 
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);
 
month = get_month_number(month);
 
month2 = get_month_number(month2);
 
month2 = get_month_number(month2);
 +
if 0 == month or 0 == month2 then return false; end
 
else
 
else
month = get_season_number(month);
+
month = get_season_number(month, param);
month2 = get_season_number(month2);
+
month2 = get_season_number(month2, param);
 
end
 
end
year2=year;
+
year2 = year;
 
 
elseif mw.ustring.match(date_string, patterns['My'][1]) then -- month/season year or proper-name year
+
elseif mw.ustring.match(date_string, patterns['My'][1]) then -- month/season/quarter/proper-name year
month, anchor_year, year=mw.ustring.match(date_string, patterns['My'][1]);
+
month, anchor_year, year = mw.ustring.match(date_string, patterns['My'][1]);
 
if not is_valid_year(year) then return false; end
 
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
+
month = get_element_number(month, param); -- get month season quarter proper-name number or nil
if 0 ~= get_month_number(month) then -- determined to be a valid range so just check this one to know if month or season
+
if not month then return false; end -- not valid whatever it is
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 mw.ustring.match(date_string, patterns['y-y'][1]) then -- Year range: YYY-YYY or YYY-YYYY or YYYY–YYYY; separated by unspaced endash; 100-9999
 
elseif mw.ustring.match(date_string, patterns['y-y'][1]) then -- Year range: YYY-YYY or YYY-YYYY or YYYY–YYYY; separated by unspaced endash; 100-9999
year, anchor_year, year2=mw.ustring.match(date_string, patterns['y-y'][1]);
+
year, anchor_year, year2 = mw.ustring.match(date_string, patterns['y-y'][1]);
anchor_year=year..'–'..anchor_year; -- assemble anchor year from both years
+
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 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 is_valid_year(year2) then return false; end -- no year farther in the future than next year
第566行: 第617行:
 
elseif mw.ustring.match(date_string, patterns['y4-y2'][1]) then -- Year range: YYYY–YY; separated by unspaced endash
 
elseif mw.ustring.match(date_string, patterns['y4-y2'][1]) then -- Year range: YYYY–YY; separated by unspaced endash
 
local century;
 
local century;
year, century, anchor_year, year2=mw.ustring.match(date_string, patterns['y4-y2'][1]);
+
year, century, anchor_year, year2 = mw.ustring.match(date_string, patterns['y4-y2'][1]);
anchor_year=year..'–'..anchor_year; -- assemble anchor year from both years
+
anchor_year = year .. '–' .. anchor_year; -- assemble anchor year from both years
 +
 
 +
if in_array (param, {'date', 'publication-date', 'year'}) then
 +
add_prop_cat ('year-range-abbreviated');
 +
end
 +
 
 
if 13 > tonumber(year2) then return false; end -- don't allow 2003-05 which might be May 2003
 
if 13 > tonumber(year2) then return false; end -- don't allow 2003-05 which might be May 2003
year2 = century..year2; -- add the century to year2 for comparisons
+
year2 = century .. year2; -- add the century to year2 for comparisons
 
if tonumber(year) >= tonumber(year2) then return false; end -- left to right, earlier to later, not the same
 
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 is_valid_year(year2) then return false; end -- no year farther in the future than next year
  
elseif mw.ustring.match (date_string, patterns['y'][1]) then -- year; here accept either YYY or YYYY
+
elseif mw.ustring.match(date_string, patterns['y'][1]) then -- year; here accept either YYY or YYYY
anchor_year, year=mw.ustring.match (date_string, patterns['y'][1]);
+
anchor_year, year = mw.ustring.match(date_string, patterns['y'][1]);
 
if false == is_valid_year(year) then
 
if false == is_valid_year(year) then
 
return false;
 
return false;
第583行: 第639行:
 
end
 
end
  
if test_accessdate then -- test accessdate here because we have numerical date parts
+
if 'access-date' == param 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
 
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
 
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
+
if not is_valid_accessdate(year .. '-' .. month .. '-' .. day) then
 
return false; -- return false when accessdate out of bounds
 
return false; -- return false when accessdate out of bounds
 
end
 
end
第596行: 第652行:
 
local result=true; -- check whole dates for validity; assume true because not all dates will go through this test
 
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)
 
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);
+
result = is_valid_date (year, month, day, param); -- <param> for |pmc-embargo-date=
  
 
elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 == month2 and 0 ~= day2 then -- YMD-d (day range)
 
elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 == month2 and 0 ~= day2 then -- YMD-d (day range)
result=is_valid_date(year,month,day);
+
result = is_valid_date (year, month, day);
result=result and is_valid_date(year,month,day2);
+
result = result and is_valid_date (year, month, day2);
  
 
elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 ~= month2 and 0 ~= day2 then -- YMD-md (day month range)
 
elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 ~= month2 and 0 ~= day2 then -- YMD-md (day month range)
result=is_valid_date(year,month,day);
+
result = is_valid_date (year, month, day);
result=result and is_valid_date(year,month2,day2);
+
result = result and is_valid_date (year, month2, day2);
  
 
elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 ~= year2 and 0 ~= month2 and 0 ~= day2 then -- YMD-ymd (day month year range)
 
elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 ~= year2 and 0 ~= month2 and 0 ~= day2 then -- YMD-ymd (day month year range)
result=is_valid_date(year,month,day);
+
result = is_valid_date(year, month, day);
result=result and is_valid_date(year2,month2,day2);
+
result = result and is_valid_date(year2, month2, day2);
 
end
 
end
 
 
第614行: 第670行:
  
 
if nil ~= tCOinS_date then -- this table only passed into this function when testing |date= parameter values
 
if nil ~= tCOinS_date then -- this table only passed into this function when testing |date= parameter values
make_COinS_date ({year=year, month=month, day=day, year2=year2, month2=month2, day2=day2}, tCOinS_date); -- make an ISO 8601 date string for COinS
+
make_COinS_date ({year = year, month = month, day = day, year2 = year2, month2 = month2, day2 = day2}, tCOinS_date); -- make an ISO 8601 date string for COinS
 
end
 
end
 
 
第628行: 第684行:
  
 
Unlike most error messages created in this module, only one error message is created by this function. Because all of the date holding parameters are processed serially,
 
Unlike most error messages created in this module, only one error message is created by this function. Because all of the date holding parameters are processed serially,
a single error message is created as the dates are tested.
+
parameters with errors are added to the <error_list> sequence table as the dates are tested.
  
 
]]
 
]]
  
local function dates(date_parameters_list, tCOinS_date)
+
local function dates(date_parameters_list, tCOinS_date, error_list)
local anchor_year; -- will return as nil if the date being tested is not |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 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 embargo_date; -- if embargo date is a good dmy, mdy, ymd date then holds original value else reset to 9999
local error_message = "";
 
 
local good_date = false;
 
local good_date = false;
+
 
 
for k, v in pairs(date_parameters_list) do -- for each date-holding parameter in the list
 
for k, v in pairs(date_parameters_list) do -- for each date-holding parameter in the list
 
if is_set(v.val) then -- if the parameter has a value
 
if is_set(v.val) then -- if the parameter has a value
v.val = mw.ustring.gsub (v.val, '%d', cfg.date_names.local_digits); -- translate 'local' digits to Western 0-9
+
v.val = mw.ustring.gsub(v.val, '%d', cfg.date_names.local_digits); -- translate 'local' digits to Western 0-9
 
if v.val:match("^c%. [1-9]%d%d%d?%a?$") then -- special case for c. year or with or without CITEREF disambiguator - only |date= and |year=
 
if v.val: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.val:match("c%. ([1-9]%d%d%d?)%a?"); -- get the year portion so it can be tested
 
local year = v.val:match("c%. ([1-9]%d%d%d?)%a?"); -- get the year portion so it can be tested
if 'date'==k then
+
if 'date' == k then
 
anchor_year, COinS_date = v.val:match("((c%. [1-9]%d%d%d?)%a?)"); -- anchor year and COinS_date only from |date= parameter
 
anchor_year, COinS_date = v.val:match("((c%. [1-9]%d%d%d?)%a?)"); -- anchor year and COinS_date only from |date= parameter
 
good_date = is_valid_year(year);
 
good_date = is_valid_year(year);
elseif 'year'==k then
+
elseif 'year' == k then
 
good_date = is_valid_year(year);
 
good_date = is_valid_year(year);
 
end
 
end
elseif 'date'==k then -- if the parameter is |date=
+
elseif 'date' == k then -- if the parameter is |date=
if v.val:match("^n%.d%.%a?$") then -- if |date=n.d. with or without a CITEREF disambiguator
+
if v.val:match("^n%.d%.%a?$") then -- ToDo: I18N -- if |date=n.d. with or without a CITEREF disambiguator
good_date, anchor_year, COinS_date = true, v.val:match("((n%.d%.)%a?)"); --"n.d."; no error when date parameter is set to no date
+
good_date, anchor_year, COinS_date = true, v.val:match("((n%.d%.)%a?)"); -- ToDo: I18N -- "n.d."; no error when date parameter is set to no date
elseif v.val:match("^nd%a?$") then -- if |date=nd with or without a CITEREF disambiguator
+
elseif v.val:match("^nd%a?$") then -- ToDo: I18N -- if |date=nd with or without a CITEREF disambiguator
good_date, anchor_year, COinS_date = true, v.val:match("((nd)%a?)"); --"nd"; no error when date parameter is set to no date
+
good_date, anchor_year, COinS_date = true, v.val:match("((nd)%a?)"); -- ToDo: I18N -- "nd"; no error when date parameter is set to no date
 
else
 
else
good_date, anchor_year, COinS_date = check_date (v.val, tCOinS_date); -- go test the date
+
good_date, anchor_year, COinS_date = check_date (v.val, k, tCOinS_date); -- go test the date
 
end
 
end
elseif 'year'==k then -- if the parameter is |year= it should hold only a year value
+
elseif 'year' == k then -- if the parameter is |year= it should hold only a year value
if v.val:match("^[1-9]%d%d%d?%a?$") then -- if |year= 3 or 4 digits only with or without a CITEREF disambiguator
+
if v.val:match("^[1-9]%d%d%d?%a?$") then -- if |year = 3 or 4 digits only with or without a CITEREF disambiguator
 
good_date, anchor_year, COinS_date = true, v.val:match("((%d+)%a?)");
 
good_date, anchor_year, COinS_date = true, v.val:match("((%d+)%a?)");
 
end
 
end
elseif 'access-date'==k then -- if the parameter is |date=
+
elseif 'pmc-embargo-date' == k then -- if the parameter is |pmc-embargo-date=
good_date = check_date (v.val, nil, true); -- go test the date; nil is a placeholder; true is the test_accessdate flag
+
good_date = check_date (v.val, k); -- go test the date
elseif 'embargo'==k then -- if the parameter is |embargo=
 
good_date = check_date (v.val); -- go test the date
 
 
if true == good_date then -- if the date is a valid date
 
if true == good_date then -- if the date is a valid date
good_date, embargo_date = is_valid_embargo_date (v.val); -- is |embargo= date a single dmy, mdy, or ymd formatted date? yes:returns embargo; no: returns 9999
+
good_date, embargo_date = is_valid_embargo_date (v.val); -- is |pmc-embargo-date= date a single dmy, mdy, or ymd formatted date? yes: returns embargo date; no: returns 9999
 
end
 
end
 
else -- any other date-holding parameter
 
else -- any other date-holding parameter
good_date = check_date (v.val); -- go test the date
+
good_date = check_date (v.val, k); -- go test the date
 
end
 
end
if false==good_date then -- assemble one error message so we don't add the tracking category multiple times
+
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 ...
+
table.insert (error_list, wrap_style ('parameter', v.name)); -- make parameter name suitable for error message list
error_message=error_message .. ", "; -- ... add a comma space separator
 
end
 
error_message=error_message .. "&#124;" .. v.name .. "="; -- add the failed parameter
 
 
end
 
end
 
end
 
end
 
end
 
end
return anchor_year, embargo_date, error_message; -- and done
+
return anchor_year, embargo_date; -- and done
 
end
 
end
  
第686行: 第736行:
 
--[[--------------------------< Y E A R _ D A T E _ C H E C K >------------------------------------------------
 
--[[--------------------------< Y E A R _ D A T E _ C H E C K >------------------------------------------------
  
Compare the value provided in |year= with the year value(s) provided in |date=.  This function returns a numeric value:
+
Compare the value provided in |year= with the year value(s) provided in |date=.  This function sets a local numeric value:
 
0 - year value does not match the year value in date
 
0 - year value does not match the year value in date
 
1 - (default) year value matches the year value in date or one of the year values when date contains two years
 
1 - (default) year value matches the year value in date or one of the year values when date contains two years
 
2 - year value matches the year value in date when date is in the form YYYY-MM-DD and year is disambiguated (|year=YYYYx)
 
2 - year value matches the year value in date when date is in the form YYYY-MM-DD and year is disambiguated (|year=YYYYx)
 +
 +
the numeric value in <result> determines the 'output' if any from this function:
 +
0 – adds error message to error_list sequence table
 +
1 – adds maint cat
 +
2 – does nothing
  
 
]]
 
]]
  
local function year_date_check (year_string, date_string)
+
local function year_date_check (year_string, year_origin, date_string, date_origin, error_list)
 
local year;
 
local year;
 
local date1;
 
local date1;
 
local date2;
 
local date2;
 
local result = 1; -- result of the test; assume that the test passes
 
local result = 1; -- result of the test; assume that the test passes
+
 
 
year = year_string:match ('(%d%d%d%d?)');
 
year = year_string:match ('(%d%d%d%d?)');
  
第729行: 第784行:
 
result = 0;
 
result = 0;
 
end
 
end
else
+
else -- should never get here; this function called only when no other date errors
 
result = 0; -- no recognizable year in date
 
result = 0; -- no recognizable year in date
 
end
 
end
return result;
+
 
 +
if 0 == result then -- year / date mismatch
 +
table.insert (error_list, substitute (cfg.messages['mismatch'], {year_origin, date_origin})); -- add error message to error_list sequence table
 +
elseif 1 == result then -- redundant year / date
 +
set_message ('maint_date_year'); -- add a maint cat
 +
end
 
end
 
end
  
第741行: 第801行:
 
reformatted.  Does the grunt work for reformat_dates().
 
reformatted.  Does the grunt work for reformat_dates().
  
The table re_formats maps patern_idx (current format) and format_param (desired format) to a table that holds:
+
The table re_formats maps pattern_idx (current format) and format_param (desired format) to a table that holds:
 
format string used by string.format()
 
format string used by string.format()
 
identifier letters ('d', 'm', 'y', 'd2', 'm2', 'y2') that serve as indexes into a table t{} that holds captures
 
identifier letters ('d', 'm', 'y', 'd2', 'm2', 'y2') that serve as indexes into a table t{} that holds captures
第751行: 第811行:
 
patterns['ymd'][1] is the match pattern with captures for mw.ustring.match()
 
patterns['ymd'][1] is the match pattern with captures for mw.ustring.match()
 
patterns['ymd'][2] is an indicator letter identifying the content of the first capture
 
patterns['ymd'][2] is an indicator letter identifying the content of the first capture
patterns['ymd'][3] ... the second capture etc
+
patterns['ymd'][3] ... the second capture etc.
  
 
when a pattern matches a date, the captures are loaded into table t{} in capture order using the idemtifier
 
when a pattern matches a date, the captures are loaded into table t{} in capture order using the idemtifier
第768行: 第828行:
 
['mdy'] = {'%s %s, %s', 'm', 'd', 'y'}, -- |df=mdy
 
['mdy'] = {'%s %s, %s', 'm', 'd', 'y'}, -- |df=mdy
 
['dmy'] = {'%s %s %s', 'd', 'm', 'y'}, -- |df=dmy
 
['dmy'] = {'%s %s %s', 'd', 'm', 'y'}, -- |df=dmy
-- ['yMd'] = {'%s %s %s', 'y', 'm', 'd'}, -- |df=yMd; not supported at en.wiki
+
-- ['yMd'] = {'%s %s %s', 'y', 'm', 'd'}, -- |df=yMd; not supported at en.wiki
 
},
 
},
 
['Mdy'] = { -- date format is Mdy; reformat to:
 
['Mdy'] = { -- date format is Mdy; reformat to:
第774行: 第834行:
 
['dmy'] = {'%s %s %s', 'd', 'm', 'y'}, -- |df=dmy
 
['dmy'] = {'%s %s %s', 'd', 'm', 'y'}, -- |df=dmy
 
['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'}, -- |df=ymd
 
['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'}, -- |df=ymd
-- ['yMd'] = {'%s %s %s', 'y', 'm', 'd'}, -- |df=yMd; not supported at en.wiki
+
-- ['yMd'] = {'%s %s %s', 'y', 'm', 'd'}, -- |df=yMd; not supported at en.wiki
 
},
 
},
 
['dMy'] = { -- date format is dMy; reformat to:
 
['dMy'] = { -- date format is dMy; reformat to:
第780行: 第840行:
 
['mdy'] = {'%s %s, %s', 'm', 'd', 'y'}, -- |df=mdy
 
['mdy'] = {'%s %s, %s', 'm', 'd', 'y'}, -- |df=mdy
 
['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'}, -- |df=ymd
 
['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'}, -- |df=ymd
-- ['yMd'] = {'%s %s %s', 'y', 'm', 'd'}, -- |df=yMd; not supported at en.wiki
+
-- ['yMd'] = {'%s %s %s', 'y', 'm', 'd'}, -- |df=yMd; not supported at en.wiki
 
},
 
},
 
['Md-dy'] = { -- date format is Md-dy; reformat to:
 
['Md-dy'] = { -- date format is Md-dy; reformat to:
第815行: 第875行:
 
['any'] = {'%s %s', 'm', 'y'}, -- dmy/mdy agnostic
 
['any'] = {'%s %s', 'm', 'y'}, -- dmy/mdy agnostic
 
},
 
},
-- ['yMd'] = { -- not supported at en.wiki
+
-- ['yMd'] = { -- not supported at en.wiki
-- ['mdy'] = {'%s %s, %s', 'm', 'd', 'y'}, -- |df=mdy
+
-- ['mdy'] = {'%s %s, %s', 'm', 'd', 'y'}, -- |df=mdy
-- ['dmy'] = {'%s %s %s', 'd', 'm', 'y'}, -- |df=dmy
+
-- ['dmy'] = {'%s %s %s', 'd', 'm', 'y'}, -- |df=dmy
-- ['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'}, -- |df=ymd
+
-- ['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'}, -- |df=ymd
-- },
+
-- },
 
}
 
}
  
第836行: 第896行:
 
end
 
end
  
-- if 'yMd' == format_param and in_array (pattern_idx, {'yMd', 'Md-dy', 'd-dMy', 'dM-dMy', 'Md-Mdy', 'dMy-dMy', 'Mdy-Mdy'}) then -- not supported at en.wiki
+
-- yMd is not supported at en.wiki; when yMd is supported at your wiki, uncomment the next line
if 'yMd' == format_param then -- not supported at en.wiki
+
-- if 'yMd' == format_param and in_array (pattern_idx, {'yMd', 'Md-dy', 'd-dMy', 'dM-dMy', 'Md-Mdy', 'dMy-dMy', 'Mdy-Mdy'}) then -- these formats not convertable; yMd not supported at en.wiki
 +
if 'yMd' == format_param then -- yMd not supported at en.wiki; when yMd is supported at your wiki, remove or comment-out this line
 
return; -- not a reformattable date
 
return; -- not a reformattable date
 
end
 
end
第853行: 第914行:
 
[patterns[pattern_idx][8] or 'x'] = c7;
 
[patterns[pattern_idx][8] or 'x'] = c7;
 
};
 
};
 +
 +
if t.a then -- if this date has an anchor year capture
 +
t.y = t.a; -- use the anchor year capture when reassembling the date
 +
end
  
 
if tonumber(t.m) then -- if raw month is a number (converting from ymd)
 
if tonumber(t.m) then -- if raw month is a number (converting from ymd)
第862行: 第927行:
 
t.d = t.d:gsub ('0(%d)', '%1'); -- strip leading '0' from day if present
 
t.d = t.d:gsub ('0(%d)', '%1'); -- strip leading '0' from day if present
 
elseif 'ymd' == format_param then -- when converting to ymd
 
elseif 'ymd' == format_param then -- when converting to ymd
if 1582 > tonumber(t.y) then -- ymd format dates not allowed before 1582
+
t.y = t.y:gsub ('%a', ''); -- strip CITREF disambiguator if present; anchor year already known so process can proceed; TODO: maint message?
 +
if 1582 > tonumber (t.y) then -- ymd format dates not allowed before 1582
 
return;
 
return;
 
end
 
end
第959行: 第1,025行:
 
end -- if
 
end -- if
 
end -- for
 
end -- for
return result; -- declare boolean result and done
+
return result; -- declare boolean result and done
 
end
 
end
  
第976行: 第1,042行:
 
local n;
 
local n;
 
for param_name, param_val in pairs(date_parameters_list) do -- for each date-holding parameter in the list
 
for param_name, param_val in pairs(date_parameters_list) do -- for each date-holding parameter in the list
if is_set (param_val.val) then
+
if is_set (param_val.val) and
if not mw.ustring.match (param_val.val, '%d%d%d%d%-%d%d%-%d%d') then -- for those that are not ymd dates (ustring because here digits may not be western)
+
not mw.ustring.match (param_val.val, patterns.ymd[1]) then -- for those that are not ymd dates (ustring because here digits may not be Western)
 
param_val.val, n = param_val.val:gsub ('%-', '–'); -- replace any hyphen with ndash
 
param_val.val, n = param_val.val:gsub ('%-', '–'); -- replace any hyphen with ndash
 
if 0 ~= n then
 
if 0 ~= n then
第983行: 第1,049行:
 
result = true;
 
result = true;
 
end
 
end
end
 
 
end
 
end
 
end
 
end
第995行: 第1,060行:
 
date parser function.  This is simple name-for-name replacement and may not work for all languages.
 
date parser function.  This is simple name-for-name replacement and may not work for all languages.
  
if xlat_dig is true, this function will also translate western (English) digits to the local language's digits.
+
if xlat_dig is true, this function will also translate Western (English) digits to the local language's digits.
 
This will also translate ymd dates.
 
This will also translate ymd dates.
  
 
]]
 
]]
  
local function date_name_xlate (date_parameters_list, xlt_dig)
+
local function date_name_xlate (date_parameters_list, xlt_dig)
 
local xlate;
 
local xlate;
 
local mode; -- long or short month names
 
local mode; -- long or short month names
第1,027行: 第1,092行:
  
 
if xlt_dig then -- shall we also translate digits?
 
if xlt_dig then -- shall we also translate digits?
date = date:gsub ('%d', cfg.date_names.xlate_digits); -- translate digits from western to 'local digits'
+
date = date:gsub ('%d', cfg.date_names.xlate_digits); -- translate digits from Western to 'local digits'
 
date_parameters_list[param_name].val = date; -- save the translated date
 
date_parameters_list[param_name].val = date; -- save the translated date
 
modified = true;
 
modified = true;
第1,035行: 第1,100行:
 
 
 
return modified;
 
return modified;
end
+
end
  
  
第1,045行: 第1,110行:
  
 
local function set_selected_modules (cfg_table_ptr, utilities_page_ptr)
 
local function set_selected_modules (cfg_table_ptr, utilities_page_ptr)
is_set = utilities_page_ptr.is_set; -- import functions from selected Module:Citation/CS1/Utilities module
+
add_prop_cat = utilities_page_ptr.add_prop_cat ; -- import functions from selected Module:Citation/CS1/Utilities module
in_array = utilities_page_ptr.in_array; -- import functions from selected Module:Citation/CS1/Utilities module
+
is_set = utilities_page_ptr.is_set;
 +
in_array = utilities_page_ptr.in_array;
 +
set_message = utilities_page_ptr.set_message;
 +
substitute = utilities_page_ptr.substitute;
 +
wrap_style = utilities_page_ptr.wrap_style;
 +
 
 
cfg = cfg_table_ptr; -- import tables from selected Module:Citation/CS1/Configuration
 
cfg = cfg_table_ptr; -- import tables from selected Module:Citation/CS1/Configuration
 
end
 
end

2022年1月22日 (六) 22:11的版本

此模块的文档可以在模块:Citation/CS1/Date validation/doc创建

--[[--------------------------< F O R W A R D   D E C L A R A T I O N S >--------------------------------------
]]

local add_prop_cat, is_set, in_array, set_message, substitute, wrap_style;		-- imported functions from selected Module:Citation/CS1/Utilities
local cfg;																		-- table of tables imported from selected Module:Citation/CS1/Configuration


--[[--------------------------< F I L E - S C O P E   D E C L A R A T I O N S >--------------------------------

File-scope variables are declared here

]]

local lang_object = mw.getContentLanguage();									-- used by is_valid_accessdate(), is_valid_year(), date_name_xlate(); TODO: move to ~/Configuration?
local year_limit;																-- used by is_valid_year()


--[=[-------------------------< 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 |access-date= 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

This function does not work if it is fed month names for languages other than English.  Wikimedia #time: parser
apparently doesn't understand non-English date month names. This function will always return false when the date
contains a non-English month name because good1 is false after the call to lang.formatDate().  To get around that
call this function with YYYY-MM-DD format dates.

]=]

local function is_valid_accessdate (accessdate)
	local good1, good2;
	local access_ts, tomorrow_ts;												-- to hold Unix time stamps representing the dates

	good1, access_ts = pcall (lang_object.formatDate, lang_object, 'U', accessdate );			-- convert accessdate value to Unix timestamp 
	good2, tomorrow_ts = pcall (lang_object.formatDate, lang_object, 'U', 'today + 2 days' );	-- today midnight + 2 days is one second more than all day tomorrow
	
	if good1 and good2 then														-- lang.formatDate() returns a timestamp in the local script which which tonumber() may not understand
		access_ts = tonumber (access_ts) or lang_object:parseFormattedNumber (access_ts);		-- convert to numbers for the comparison;
		tomorrow_ts = tonumber (tomorrow_ts) or lang_object:parseFormattedNumber (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
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)
	return cfg.date_names['local'].long[month] or cfg.date_names['local'].short[month] or	-- look for local names first
			cfg.date_names['en'].long[month] or	cfg.date_names['en'].short[month] or		-- failing that, look for English names
			0;																				-- not a recognized month name
end


--[[--------------------------< 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: 21 for Spring, etc.  Capitalization and spelling
must be correct. If not a valid season, returns 0.
	21-24 = Spring, Summer, Autumn, Winter, independent of “Hemisphere”

returns 0 when <param> is not |date=

Season numbering is defined by Extended Date/Time Format (EDTF) specification (https://www.loc.gov/standards/datetime/)
which became part of ISO 8601 in 2019.  See '§Sub-year groupings'.  The standard defines various divisions using
numbers 21-41.  cs1|2 only supports generic seasons.  EDTF does support the distinction between north and south
hemisphere seasons but cs1|2 has no way to make that distinction.

These additional divisions not currently supported:
	25-28 = Spring - Northern Hemisphere, Summer- Northern Hemisphere, Autumn - Northern Hemisphere, Winter - Northern Hemisphere
	29-32 = Spring – Southern Hemisphere, Summer– Southern Hemisphere, Autumn – Southern Hemisphere, Winter - Southern Hemisphere
	33-36 = Quarter 1, Quarter 2, Quarter 3, Quarter 4 (3 months each)
	37-39 = Quadrimester 1, Quadrimester 2, Quadrimester 3 (4 months each)
	40-41 = Semestral 1, Semestral-2 (6 months each)

]]

local function get_season_number (season, param)
	if 'date' ~= param then
		return 0;																-- season dates only supported by |date=
	end
	return cfg.date_names['local'].season[season] or							-- look for local names first
			cfg.date_names['en'].season[season] or								-- failing that, look for English names
			0;																	-- not a recognized season name
end


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

returns a number according to the sequence of quarters in a year: 33 for first quarter, etc.  Capitalization and spelling
must be correct. If not a valid quarter, returns 0.
	33-36 = Quarter 1, Quarter 2, Quarter 3, Quarter 4 (3 months each)

returns 0 when <param> is not |date=

Quarter numbering is defined by Extended Date/Time Format (EDTF) specification (https://www.loc.gov/standards/datetime/)
which became part of ISO 8601 in 2019.  See '§Sub-year groupings'.  The standard defines various divisions using
numbers 21-41.  cs1|2 only supports generic seasons and quarters.

These additional divisions not currently supported:
	37-39 = Quadrimester 1, Quadrimester 2, Quadrimester 3 (4 months each)
	40-41 = Semestral 1, Semestral-2 (6 months each)

]]

local function get_quarter_number (quarter, param)
	if 'date' ~= param then
		return 0;																-- quarter dates only supported by |date=
	end
	quarter = mw.ustring.gsub (quarter, ' +', ' ');								-- special case replace multiple space chars with a single space char
	return cfg.date_names['local'].quarter[quarter] or							-- look for local names first
			cfg.date_names['en'].quarter[quarter] or							-- failing that, look for English names
			0;																	-- not a recognized quarter name
end


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

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

returns 0 when <param> is not |date=

]]

local function get_proper_name_number (name, param)
	if 'date' ~= param then
		return 0;																-- proper-name dates only supported by |date=
	end
	return cfg.date_names['local'].named[name] or								-- look for local names dates first
			cfg.date_names['en'].named[name] or									-- failing that, look for English names
			0;																	-- not a recognized named date
end


--[[--------------------------< G E T _ E L E M E N T _ N U M B E R <------------------------------------------

returns true if month or season or quarter or proper name is valid (properly spelled, capitalized, abbreviated)

]]

local function get_element_number (element, param)
	local num;
	
	local funcs = {get_month_number, get_season_number, get_quarter_number, get_proper_name_number};	-- list of functions to execute in order
	
	for _, func in ipairs (funcs) do											-- spin through the function list
		num = func (element, param);											-- call the function and get the returned number
		if 0 ~= num then														-- non-zero when valid month season quarter 
			return num;															-- return that number
		end
	end
	return nil;																	-- not valid
end


--[[--------------------------< I S _ V A L I D _ Y E A R >----------------------------------------------------

Function gets current year from the server and compares it to year from a citation parameter.  Years more than one
year in the future are not acceptable.

Special case for |pmc-embargo-date=: years more than two years in the future are not acceptable

]]

local function is_valid_year (year, param)
	if not is_set (year_limit) then
		year_limit = tonumber(os.date("%Y"))+1;									-- global variable so we only have to fetch it once
	end

	year = tonumber (year) or lang_object:parseFormattedNumber (year);			-- convert to number for the comparison;
	
	if 'pmc-embargo-date' == param then											-- special case for |pmc-embargo-date=
		return year and (year <= tonumber(os.date("%Y"))+2) or false;			-- years more than two years in the future are not accepted
	end	
	return year and (year <= year_limit) or false;
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 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, param)
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, param) then										-- no farther into the future than next year except |pmc-embargo-date= no more than two years in the future
		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												-- is a leap year?
				month_length = 29;												-- if leap year then 29 days in February
			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
	else
		month_length = days_in_month[month];
	end

	if tonumber (day) > month_length then
		return false;
	end
	return true;
end


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

Months in a range are expected to have the same style: Jan–Mar or October–December but not February–Mar or Jul–August. 
This function looks in cfg.date_names{} to see if both month names are listed in the long subtable or both are
listed in the short subtable.  When both have the same style (both are listed in the same table), returns true; false else

]]

local function is_valid_month_range_style (month1, month2)
	if (cfg.date_names.en.long[month1] and cfg.date_names.en.long[month2]) or					-- are both English names listed in the long subtable?
		(cfg.date_names.en.short[month1] and cfg.date_names.en.short[month2]) or				-- are both English names listed in the short subtable?
		(cfg.date_names['local'].long[month1] and cfg.date_names['local'].long[month2]) or		-- are both local names listed in the long subtable?
		(cfg.date_names['local'].short[month1] and cfg.date_names['local'].short[month2]) then	-- are both local names listed in the short subtable?
			return true;
	end
	return false;																-- names are mixed
end


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

Check a pair of months or seasons to see if both are valid members of a month or season pair.

Month pairs are expected to be left to right, earliest to latest in time.

All season ranges are accepted as valid because there are publishers out there who have published a Summer–Spring YYYY issue, hence treat as ok

]]

local function is_valid_month_season_range(range_start, range_end, param)
	local range_start_number = get_month_number (range_start);
	local range_end_number;

	if 0 == range_start_number then												-- is this a month range?
		range_start_number = get_season_number (range_start, param);			-- not a month; is it a season? get start season number
		range_end_number = get_season_number (range_end, param);				-- get end season number

		if (0 ~= range_start_number) and (0 ~= range_end_number) and (range_start_number ~= range_end_number) then
			return true;														-- any season pairing is accepted except when both are the same
		end
		return false;															-- range_start and/or range_end is not a season
	end
																				-- here when range_start is a month
	range_end_number = get_month_number (range_end);							-- get end month number
	if range_start_number < range_end_number and								-- range_start is a month; does range_start precede range_end?
		is_valid_month_range_style (range_start, range_end) then				-- do months have the same style?
			return true;														-- proper order and same style
	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; 99 Christmas
	day, day2 –  0 if not provided, 1-31 for days
	
the output table receives:
	rftdate:	an ISO 8601 formatted date
	rftchron:	a free-form version of the date, usually without year which is in rftdate (season ranges and proper-name dates)
	rftssn:		one of four season keywords: winter, spring, summer, fall (lowercase)
	rftquarter:	one of four values: 1, 2, 3, 4

]]

local function make_COinS_date (input, tCOinS_date)
	local date;																	-- one date or first date in a range
	local date2 = '';															-- end of range date
-- start temporary Julian / Gregorian calendar uncertainty detection
	local year = tonumber(input.year);											-- this temporary code to determine the extent of sources dated to the Julian/Gregorian
	local month = tonumber(input.month);										-- interstice 1 October 1582 – 1 January 1926
	local day = tonumber (input.day);
	if (0 ~= day) and															-- day must have a value for this to be a whole date
		(((1582 == year) and (10 <= month) and (12 >= month)) or				-- any whole 1582 date from 1 October to 31 December or
			((1926 == year) and (1 == month) and (1 == input.day)) or			-- 1 January 1926 or
				((1582 < year) and (1925 >= year))) then						-- any date 1 January 1583 – 31 December 1925
					tCOinS_date.inter_cal_cat = true;							-- set category flag true
	end
-- end temporary Julian / Gregorian calendar uncertainty detection
	
	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 proper-name date
			local season = {[24] = 'winter', [21] = 'spring', [22] = 'summer', [23] = 'fall', [33] = '1', [34] = '2', [35] = '3', [36] = '4', [98] = 'Easter', [99] = 'Christmas'};	-- seasons lowercase, no autumn; proper-names use title case
			if 0 == input.month2 then											-- single season date
				if 40 < tonumber(input.month) then
					tCOinS_date.rftchron = season[input.month];					-- proper-name dates
				elseif 30 < tonumber(input.month) then
					tCOinS_date.rftquarter = season[input.month];				-- quarters
				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


--[[--------------------------< P A T T E R N S >--------------------------------------------------------------

this is the list of patterns for date formats that this module recognizes.  Approximately the first half of these
patterns represent formats that might be reformatted into another format.  Those that might be reformatted have
'indicator' letters that identify the content of the matching capture: 'd' (day), 'm' (month), 'a' (anchor year),
'y' (year); second day, month, year have a '2' suffix.

These patterns are used for both date validation and for reformatting.  This table should not be moved to ~/Configuration
because changes to this table require changes to check_date() and to reformatter() and reformat_date()

]]

local patterns = {
	 																			-- year-initial numerical year-month-day
	['ymd'] = {'^(%d%d%d%d)%-(%d%d)%-(%d%d)$', 'y', 'm', 'd'},					
																				-- month-initial: month day, year
	['Mdy'] = {'^(%D-) +([1-9]%d?), +((%d%d%d%d?)%a?)$', 'm', 'd', 'a', 'y'},
																				-- month-initial day range: month day–day, year; days are separated by endash
	['Md-dy'] = {'^(%D-) +([1-9]%d?)[%-–]([1-9]%d?), +((%d%d%d%d)%a?)$', 'm', 'd', 'd2', 'a', 'y'},
																				-- day-initial: day month year
	['dMy'] = {'^([1-9]%d?) +(%D-) +((%d%d%d%d?)%a?)$', 'd', 'm', 'a', 'y'},
																				-- year-initial: year month day; day: 1 or 2 two digits, leading zero allowed; not supported at en.wiki
	--	['yMd'] = {'^((%d%d%d%d?)%a?) +(%D-) +(%d%d?)$', 'a', 'y', 'm', 'd'},
																				-- day-range-initial: day–day month year; days are separated by endash
	['d-dMy'] = {'^([1-9]%d?)[%-–]([1-9]%d?) +(%D-) +((%d%d%d%d)%a?)$', 'd', 'd2', 'm', 'a', 'y'},
																				-- day initial month-day-range: day month - day month year; uses spaced endash
	['dM-dMy'] = {'^([1-9]%d?) +(%D-) +[%-–] +([1-9]%d?) +(%D-) +((%d%d%d%d)%a?)$', 'd', 'm', 'd2', 'm2', 'a', 'y'},
																				-- month initial month-day-range: month day – month day, year;  uses spaced endash
	['Md-Mdy'] = {'^(%D-) +([1-9]%d?) +[%-–] +(%D-) +([1-9]%d?), +((%d%d%d%d)%a?)$','m', 'd', 'm2', 'd2', 'a', 'y'},
																				-- day initial month-day-year-range: day month year - day month year; uses spaced endash
	['dMy-dMy'] = {'^([1-9]%d?) +(%D-) +(%d%d%d%d) +[%-–] +([1-9]%d?) +(%D-) +((%d%d%d%d)%a?)$', 'd', 'm', 'y', 'd2', 'm2', 'a', 'y2'},
																				-- month initial month-day-year-range: month day, year – month day, year;  uses spaced endash
	['Mdy-Mdy'] = {'^(%D-) +([1-9]%d?), +(%d%d%d%d) +[%-–] +(%D-) +([1-9]%d?), +((%d%d%d%d)%a?)$', 'm', 'd', 'y', 'm2', 'd2', 'a', 'y2'},

																				-- these date formats cannot be converted, per se, but month name can be rendered short or long
																				-- month/season year - month/season year; separated by spaced endash
	['My-My'] = {'^(%D-) +(%d%d%d%d) +[%-–] +(%D-) +((%d%d%d%d)%a?)$', 'm', 'y', 'm2', 'a', 'y2'},
																				-- month/season range year; months separated by endash
	['M-My'] = {'^(%D-)[%-–](%D-) +((%d%d%d%d)%a?)$', 'm', 'm2', 'a', 'y'},
																				-- month/season year or proper-name year; quarter year when First Quarter YYYY etc.
	['My'] = {'^([^%d–]-) +((%d%d%d%d)%a?)$', 'm', 'a', 'y'},					-- this way because endash is a member of %D; %D- will match January–March 2019 when it shouldn't

																				-- these date formats cannot be converted
	['Sy4-y2'] = {'^(%D-) +((%d%d)%d%d)[%-–]((%d%d)%a?)$'},						-- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash
	['Sy-y'] = {'^(%D-) +(%d%d%d%d)[%-–]((%d%d%d%d)%a?)$'},						-- special case Winter/Summer year-year; year separated with unspaced endash
	['y-y'] = {'^(%d%d%d%d?)[%-–]((%d%d%d%d?)%a?)$'},							-- year range: YYY-YYY or YYY-YYYY or YYYY–YYYY; separated by unspaced endash; 100-9999
	['y4-y2'] = {'^((%d%d)%d%d)[%-–]((%d%d)%a?)$'},								-- year range: YYYY–YY; separated by unspaced endash
	['y'] = {'^((%d%d%d%d?)%a?)$'},												-- year; here accept either YYY or YYYY
	}


--[[--------------------------< 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 |pmc-embargo-date= is
set, the editor intended to embargo a PMC but |pmc-embargo-date= does not hold a single date.

]]

local function is_valid_embargo_date (v)
	if v:match (patterns['ymd'][1]) or											-- ymd
		v:match (patterns['Mdy'][1]) or											-- dmy
		v:match (patterns['dMy'][1]) 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


--[[--------------------------< 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 character 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 is (DEBUG: not?) used 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:
	date_string - date string from date-holding parameters (date, year, publication-date, access-date, pmc-embargo-date, archive-date, lay-date)

Returns:
	false if date string is not a real date; else
	true, anchor_year, COinS_date
		anchor_year can be used in CITEREF anchors
		COinS_date is ISO 8601 format date; see make_COInS_date()

]]

local function check_date (date_string, param, tCOinS_date)
	local year;																	-- assume that year2, months, and days are not used;
	local year2 = 0;															-- second year in a year range
	local month = 0;
	local month2 = 0;															-- second month in a month range
	local day = 0;
	local day2 = 0;																-- second day in a day range
	local anchor_year;
	local coins_date;

	if date_string:match (patterns['ymd'][1]) then								-- year-initial numerical year month day format
		year, month, day = date_string:match (patterns['ymd'][1]);
		if 12 < tonumber(month) or 1 > tonumber(month) or 1582 > tonumber(year) or 0 == tonumber(day) then return false; end	-- month or day number not valid or not Gregorian calendar
		anchor_year = year;
	
	elseif mw.ustring.match(date_string, patterns['Mdy'][1]) then				-- month-initial: month day, year
		month, day, anchor_year, year = mw.ustring.match(date_string, patterns['Mdy'][1]);
		month = get_month_number (month);
		if 0 == month then return false; end									-- return false if month text isn't one of the twelve months
				
	elseif mw.ustring.match(date_string, patterns['Md-dy'][1]) then				-- month-initial day range: month day–day, year; days are separated by endash
		month, day, day2, anchor_year, year = mw.ustring.match(date_string, patterns['Md-dy'][1]);
		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 mw.ustring.match(date_string, patterns['dMy'][1]) then				-- day-initial: day month year
		day, month, anchor_year, year = mw.ustring.match(date_string, patterns['dMy'][1]);
		month = get_month_number (month);
		if 0 == month then return false; end									-- return false if month text isn't one of the twelve months

--[[ NOT supported at en.wiki
	elseif mw.ustring.match(date_string, patterns['yMd'][1]) then				-- year-initial: year month day; day: 1 or 2 two digits, leading zero allowed
		anchor_year, year, month, day = mw.ustring.match(date_string, patterns['yMd'][1]);
		month = get_month_number (month);
		if 0 == month then return false; end									-- return false if month text isn't one of the twelve months
-- end NOT supported at en.wiki ]]

	elseif mw.ustring.match(date_string, patterns['d-dMy'][1]) then				-- day-range-initial: day–day month year; days are separated by endash
		day, day2, month, anchor_year, year = mw.ustring.match(date_string, patterns['d-dMy'][1]);
		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 mw.ustring.match(date_string, patterns['dM-dMy'][1]) then			-- day initial month-day-range: day month - day month year; uses spaced endash
		day, month, day2, month2, anchor_year, year = mw.ustring.match(date_string, patterns['dM-dMy'][1]);
		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 mw.ustring.match(date_string, patterns['Md-Mdy'][1]) then			-- month initial month-day-range: month day – month day, year; uses spaced endash
		month, day, month2, day2, anchor_year, year = mw.ustring.match(date_string, patterns['Md-Mdy'][1]);
		if (not is_valid_month_season_range(month, month2, param)) 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 mw.ustring.match(date_string, patterns['dMy-dMy'][1]) then			-- day initial month-day-year-range: day month year - day month year; uses spaced endash
		day, month, year, day2, month2, anchor_year, year2 = mw.ustring.match(date_string, patterns['dMy-dMy'][1]);
		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);
		if 0 == month or 0 == month2 then return false; end						-- both must be valid

	elseif mw.ustring.match(date_string, patterns['Mdy-Mdy'][1]) then			-- month initial month-day-year-range: month day, year – month day, year; uses spaced endash
		month, day, year, month2, day2, anchor_year, year2 = mw.ustring.match(date_string, patterns['Mdy-Mdy'][1]);
		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);
		if 0 == month or 0 == month2 then return false; end						-- both must be valid

	elseif mw.ustring.match(date_string, patterns['Sy4-y2'][1]) then			-- special case Winter/Summer year-year (YYYY-YY); year separated with unspaced endash
		local century;
		month, year, century, anchor_year, year2 = mw.ustring.match(date_string, patterns['Sy4-y2'][1]);
		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, param);

	elseif mw.ustring.match(date_string, patterns['Sy-y'][1]) then				-- special case Winter/Summer year-year; year separated with unspaced endash
		month, year, anchor_year, year2 = mw.ustring.match(date_string, patterns['Sy-y'][1]);
		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, param);								-- for metadata

	elseif mw.ustring.match(date_string, patterns['My-My'][1]) then				-- month/season year - month/season year; separated by spaced endash
		month, year, month2, anchor_year, year2 = mw.ustring.match(date_string, patterns['My-My'][1]);
		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 0 ~= get_month_number(month) and 0 ~= get_month_number(month2) and is_valid_month_range_style(month, month2) 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, param) and 0 ~= get_season_number(month2, param) then	-- both must be season year, not mixed
			month = get_season_number(month, param);
			month2 = get_season_number(month2, param);
		else
			 return false;
		end

	elseif mw.ustring.match(date_string, patterns['M-My'][1]) then				-- month/season range year; months separated by endash 
		month, month2, anchor_year, year = mw.ustring.match(date_string, patterns['M-My'][1]);
		if (not is_valid_month_season_range(month, month2, param)) 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);
			if 0 == month or 0 == month2 then return false; end
		else
			month = get_season_number(month, param);
			month2 = get_season_number(month2, param);
		end
		year2 = year;
		
	elseif mw.ustring.match(date_string, patterns['My'][1]) then				-- month/season/quarter/proper-name year
		month, anchor_year, year = mw.ustring.match(date_string, patterns['My'][1]);
		if not is_valid_year(year) then return false; end
		month = get_element_number(month, param);								-- get month season quarter proper-name number or nil
		if not month then return false; end										-- not valid whatever it is

	elseif mw.ustring.match(date_string, patterns['y-y'][1]) then				-- Year range: YYY-YYY or YYY-YYYY or YYYY–YYYY; separated by unspaced endash; 100-9999
		year, anchor_year, year2 = mw.ustring.match(date_string, patterns['y-y'][1]);
		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 mw.ustring.match(date_string, patterns['y4-y2'][1]) then				-- Year range: YYYY–YY; separated by unspaced endash
		local century;
		year, century, anchor_year, year2 = mw.ustring.match(date_string, patterns['y4-y2'][1]);
		anchor_year = year .. '–' .. anchor_year;								-- assemble anchor year from both years

		if in_array (param, {'date', 'publication-date', 'year'}) then
			add_prop_cat ('year-range-abbreviated');
		end

		if 13 > tonumber(year2) then return false; end							-- don't allow 2003-05 which might be May 2003
		year2 = century .. year2;													-- add the century to year2 for comparisons
		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 mw.ustring.match(date_string, patterns['y'][1]) then					-- year; here accept either YYY or YYYY
		anchor_year, year = mw.ustring.match(date_string, patterns['y'][1]);
		if false == is_valid_year(year) then
			return false;
		end

	else
		return false;															-- date format not one of the MOS:DATE approved formats
	end

	if 'access-date' == param 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, param);						-- <param> for |pmc-embargo-date=

	elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 == month2 and 0 ~= day2 then	-- YMD-d (day range)
		result = is_valid_date (year, month, day);
		result = result and is_valid_date (year, month, day2);

	elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 == year2 and 0 ~= month2 and 0 ~= day2 then	-- YMD-md (day month range)
		result = is_valid_date (year, month, day);
		result = result and is_valid_date (year, month2, day2);

	elseif 0 ~= year and 0 ~= month and 0 ~= day and 0 ~= year2 and 0 ~= month2 and 0 ~= day2 then	-- YMD-ymd (day month year range)
		result = is_valid_date(year, month, day);
		result = result and is_valid_date(year2, month2, day2);
	end
	
	if false == result then return false; end

	if nil ~= tCOinS_date then													-- this table only passed into this function when testing |date= parameter values
		make_COinS_date ({year = year, month = month, day = day, year2 = year2, month2 = month2, day2 = day2}, tCOinS_date);	-- make an ISO 8601 date string for COinS
	end
	
	return true, anchor_year;													-- format is good and date string represents a real date
end	


--[[--------------------------< D A T E S >--------------------------------------------------------------------

Cycle the date-holding parameters in passed table date_parameters_list through check_date() to check compliance with MOS:DATE. For all valid dates, check_date() returns
true. The |date= parameter test is unique, it is the only date holding parameter from which values for anchor_year (used in CITEREF identifiers) and COinS_date (used in
the COinS metadata) are derived.  The |date= parameter is the only date-holding parameter that is allowed to contain the no-date keywords "n.d." or "nd" (without quotes).

Unlike most error messages created in this module, only one error message is created by this function. Because all of the date holding parameters are processed serially,
parameters with errors are added to the <error_list> sequence table as the dates are tested.

]]

local function dates(date_parameters_list, tCOinS_date, error_list)
	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 good_date = false;

	for k, v in pairs(date_parameters_list) do									-- for each date-holding parameter in the list
		if is_set(v.val) then													-- if the parameter has a value
			v.val = mw.ustring.gsub(v.val, '%d', cfg.date_names.local_digits);	-- translate 'local' digits to Western 0-9
			if v.val:match("^c%. [1-9]%d%d%d?%a?$") then						-- special case for c. year or with or without CITEREF disambiguator - only |date= and |year=
				local year = v.val:match("c%. ([1-9]%d%d%d?)%a?");				-- get the year portion so it can be tested
				if 'date' == k then
					anchor_year, COinS_date = v.val:match("((c%. [1-9]%d%d%d?)%a?)");	-- anchor year and COinS_date only from |date= parameter
					good_date = is_valid_year(year);
				elseif 'year' == k then
					good_date = is_valid_year(year);
				end
			elseif 'date' == k then												-- if the parameter is |date=
				if v.val:match("^n%.d%.%a?$") then -- ToDo: I18N								-- if |date=n.d. with or without a CITEREF disambiguator
					good_date, anchor_year, COinS_date = true, v.val:match("((n%.d%.)%a?)"); -- ToDo: I18N	-- "n.d."; no error when date parameter is set to no date
				elseif v.val:match("^nd%a?$") then -- ToDo: I18N								-- if |date=nd with or without a CITEREF disambiguator
					good_date, anchor_year, COinS_date = true, v.val:match("((nd)%a?)"); -- ToDo: I18N	-- "nd";	no error when date parameter is set to no date
				else
					good_date, anchor_year, COinS_date = check_date (v.val, k, tCOinS_date);	-- go test the date
				end
			elseif 'year' == k then												-- if the parameter is |year= it should hold only a year value
				if v.val:match("^[1-9]%d%d%d?%a?$") then						-- if |year = 3 or 4 digits only with or without a CITEREF disambiguator
					good_date, anchor_year, COinS_date = true, v.val:match("((%d+)%a?)");
				end
			elseif 'pmc-embargo-date' == k then									-- if the parameter is |pmc-embargo-date=
				good_date = check_date (v.val, k);								-- go test the date
				if true == good_date then										-- if the date is a valid date
					good_date, embargo_date = is_valid_embargo_date (v.val);	-- is |pmc-embargo-date= date a single dmy, mdy, or ymd formatted date? yes: returns embargo date; no: returns 9999
				end
			else																-- any other date-holding parameter
				good_date = check_date (v.val, k);								-- go test the date
			end
			if false == good_date then											-- assemble one error message so we don't add the tracking category multiple times
				table.insert (error_list, wrap_style ('parameter', v.name));	-- make parameter name suitable for error message list
			end
		end
	end
	return anchor_year, embargo_date;											-- and done
end


--[[--------------------------< Y E A R _ D A T E _ C H E C K >------------------------------------------------

Compare the value provided in |year= with the year value(s) provided in |date=.  This function sets a local numeric value:
	0 - year value does not match the year value in date
	1 - (default) year value matches the year value in date or one of the year values when date contains two years
	2 - year value matches the year value in date when date is in the form YYYY-MM-DD and year is disambiguated (|year=YYYYx)

the numeric value in <result> determines the 'output' if any from this function:
	0 – adds error message to error_list sequence table
	1 – adds maint cat
	2 – does nothing

]]

local function year_date_check (year_string, year_origin, date_string, date_origin, error_list)
	local year;
	local date1;
	local date2;
	local result = 1;															-- result of the test; assume that the test passes

	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)');
		if year ~= date1 then
			result = 0;															-- years don't match
		else
			result = 2;															-- years match; but because disambiguated, don't add to maint cat
		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
			result = 0;
		end

	elseif mw.ustring.match(date_string, "%d%d%d%d[%-–]%d%d") then				-- YYYY-YY date ranges
		local century;
		date1, century, date2 = mw.ustring.match(date_string, "((%d%d)%d%d)[%-–]+(%d%d)");
		date2 = century..date2;													-- convert YY to YYYY
		if year ~= date1 and year ~= date2 then
			result = 0;
		end

	elseif date_string:match ("%d%d%d%d?") then									-- any of the standard formats of date with one year
		date1 = date_string:match ("(%d%d%d%d?)");
		if year ~= date1 then
			result = 0;
		end
	else																		-- should never get here; this function called only when no other date errors
		result = 0;																-- no recognizable year in date
	end

	if 0 == result then															-- year / date mismatch
		table.insert (error_list, substitute (cfg.messages['mismatch'], {year_origin, date_origin}));	-- add error message to error_list sequence table
	elseif 1 == result then														-- redundant year / date
		set_message ('maint_date_year');										-- add a maint cat
	end
end


--[[--------------------------< R E F O R M A T T E R >--------------------------------------------------------

reformat 'date' into new format specified by format_param if pattern_idx (the current format of 'date') can be
reformatted.  Does the grunt work for reformat_dates().

The table re_formats maps pattern_idx (current format) and format_param (desired format) to a table that holds:
	format string used by string.format()
	identifier letters ('d', 'm', 'y', 'd2', 'm2', 'y2') that serve as indexes into a table t{} that holds captures
		from mw.ustring.match() for the various date parts specified by  patterns[pattern_idx][1]

Items in patterns{} have the general form:
	['ymd'] = {'^(%d%d%d%d)%-(%d%d)%-(%d%d)$', 'y', 'm', 'd'}, where:
		['ymd'] is pattern_idx
		patterns['ymd'][1] is the match pattern with captures for mw.ustring.match()
		patterns['ymd'][2] is an indicator letter identifying the content of the first capture
		patterns['ymd'][3] ... the second capture etc.

when a pattern matches a date, the captures are loaded into table t{} in capture order using the idemtifier
characters as indexes into t{}  For the above, a ymd date is in t{} as:
	t.y = first capture (year), t.m = second capture (month), t.d = third capture (day)

To reformat, this function is called with the pattern_idx that matches the current format of the date and with
format_param set to the desired format.  This function loads table t{} as described and then calls string.format()
with the format string specified by re_format[pattern_idx][format_param][1] using values taken from t{} according
to the capture identifier letters specified by patterns[pattern_idx][format_param][n] where n is 2..

]]

local re_formats = {
	['ymd'] = {																	-- date format is ymd; reformat to:
		['mdy'] = {'%s %s, %s', 'm', 'd', 'y'},									-- |df=mdy
		['dmy'] = {'%s %s %s', 'd', 'm', 'y'},									-- |df=dmy
	--		['yMd'] = {'%s %s %s', 'y', 'm', 'd'},								-- |df=yMd; not supported at en.wiki
		},
	['Mdy'] = {																	-- date format is Mdy; reformat to:
		['mdy'] = {'%s %s, %s', 'm', 'd', 'y'},									-- for long/short reformatting
		['dmy'] = {'%s %s %s', 'd', 'm', 'y'},									-- |df=dmy
		['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'},									-- |df=ymd
	--		['yMd'] = {'%s %s %s', 'y', 'm', 'd'},								-- |df=yMd; not supported at en.wiki
		},
	['dMy'] = {																	-- date format is dMy; reformat to:
		['dmy'] = {'%s %s %s', 'd', 'm', 'y'},									-- for long/short reformatting
		['mdy'] = {'%s %s, %s', 'm', 'd', 'y'},									-- |df=mdy
		['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'},									-- |df=ymd
	--		['yMd'] = {'%s %s %s', 'y', 'm', 'd'},								-- |df=yMd; not supported at en.wiki
		},
	['Md-dy'] = {																-- date format is Md-dy; reformat to:
		['mdy'] = {'%s %s–%s, %s', 'm', 'd', 'd2', 'y'},						-- for long/short reformatting
		['dmy'] = {'%s–%s %s %s', 'd', 'd2', 'm', 'y'},							-- |df=dmy -> d-dMy 
		},
	['d-dMy'] = {																-- date format is d-d>y; reformat to:
		['dmy'] = {'%s–%s %s %s', 'd', 'd2', 'm', 'y'},							-- for long/short reformatting
		['mdy'] = {'%s %s–%s, %s', 'm', 'd', 'd2', 'y'},						-- |df=mdy -> Md-dy 
		},
	['dM-dMy'] = {																-- date format is dM-dMy; reformat to:
		['dmy'] = {'%s %s – %s %s %s', 'd', 'm', 'd2', 'm2', 'y'},				-- for long/short reformatting
		['mdy'] = {'%s %s – %s %s, %s', 'm', 'd', 'm2', 'd2', 'y'},				-- |df=mdy -> Md-Mdy 
		},
	['Md-Mdy'] = {																-- date format is Md-Mdy; reformat to:
		['mdy'] = {'%s %s – %s %s, %s', 'm', 'd',  'm2', 'd2', 'y'},			-- for long/short reformatting
		['dmy'] = {'%s %s – %s %s %s', 'd', 'm', 'd2', 'm2', 'y'},				-- |df=dmy -> dM-dMy 
		},
	['dMy-dMy'] = {																-- date format is dMy-dMy; reformat to:
		['dmy'] = {'%s %s %s – %s %s %s', 'd', 'm', 'y', 'd2', 'm2', 'y2'},		-- for long/short reformatting
		['mdy'] = {'%s %s, %s – %s %s, %s', 'm', 'd', 'y', 'm2', 'd2', 'y2'},	-- |df=mdy -> Mdy-Mdy 
		},
	['Mdy-Mdy'] = {																-- date format is Mdy-Mdy; reformat to:
		['mdy'] = {'%s %s, %s – %s %s, %s', 'm', 'd', 'y', 'm2', 'd2', 'y2'},	-- for long/short reformatting
		['dmy'] = {'%s %s %s – %s %s %s', 'd', 'm', 'y', 'd2', 'm2', 'y2'},		-- |df=dmy -> dMy-dMy 
		},
	['My-My'] = {																-- these for long/short reformatting
		['any'] = {'%s %s – %s %s', 'm', 'y', 'm2', 'y2'},						-- dmy/mdy agnostic
		},
	['M-My'] = {																-- these for long/short reformatting
		['any'] = {'%s–%s %s', 'm', 'm2', 'y'},									-- dmy/mdy agnostic
		},
	['My'] = {																	-- these for long/short reformatting
		['any'] = {'%s %s', 'm', 'y'},											-- dmy/mdy agnostic
		},
	--	['yMd'] = {																-- not supported at en.wiki
	--		['mdy'] = {'%s %s, %s', 'm', 'd', 'y'},								-- |df=mdy
	--		['dmy'] = {'%s %s %s', 'd', 'm', 'y'},								-- |df=dmy
	--		['ymd'] = {'%s-%s-%s', 'y', 'm', 'd'},								-- |df=ymd
	--		},
	}


local function reformatter (date, pattern_idx, format_param, mon_len)
	if not in_array (pattern_idx, {'ymd', 'Mdy', 'Md-dy', 'dMy', 'yMd', 'd-dMy', 'dM-dMy', 'Md-Mdy', 'dMy-dMy', 'Mdy-Mdy', 'My-My', 'M-My', 'My'}) then
		return;																	-- not in this set of date format patterns then not a reformattable date
	end
	
	if 'ymd' == format_param and in_array (pattern_idx, {'ymd', 'Md-dy', 'd-dMy', 'dM-dMy', 'Md-Mdy', 'dMy-dMy', 'Mdy-Mdy', 'My-My', 'M-My', 'My'}) then
		return;																	-- ymd date ranges not supported at en.wiki; no point in reformatting ymd to ymd
	end

	if in_array (pattern_idx, {'My', 'M-My', 'My-My'}) then						-- these are not dmy/mdy so can't be 'reformatted' into either
		format_param = 'any';													-- so format-agnostic 
	end

																				-- yMd is not supported at en.wiki; when yMd is supported at your wiki, uncomment the next line
	--	if 'yMd' == format_param and in_array (pattern_idx, {'yMd', 'Md-dy', 'd-dMy', 'dM-dMy', 'Md-Mdy', 'dMy-dMy', 'Mdy-Mdy'}) then	-- these formats not convertable; yMd not supported at en.wiki
	if 'yMd' == format_param then												-- yMd not supported at en.wiki; when yMd is supported at your wiki, remove or comment-out this line
		return;																	-- not a reformattable date
	end
	
	local c1, c2, c3, c4, c5, c6, c7;											-- these hold the captures specified in patterns[pattern_idx][1]
	c1, c2, c3, c4, c5, c6, c7 = mw.ustring.match (date, patterns[pattern_idx][1]);	-- get the captures

	local t = {																	-- table that holds k/v pairs of date parts from the captures and patterns[pattern_idx][2..]
		[patterns[pattern_idx][2]] = c1;										-- at minimum there is always one capture with a matching indicator letter
		[patterns[pattern_idx][3] or 'x'] = c2;									-- patterns can have a variable number of captures; each capture requires an indicator letter;
		[patterns[pattern_idx][4] or 'x'] = c3;									-- where there is no capture, there is no indicator letter so n in patterns[pattern_idx][n] will be nil;
		[patterns[pattern_idx][5] or 'x'] = c4;									-- the 'x' here spoofs an indicator letter to prevent 'table index is nil' error
		[patterns[pattern_idx][6] or 'x'] = c5;
		[patterns[pattern_idx][7] or 'x'] = c6;
		[patterns[pattern_idx][8] or 'x'] = c7;
		};

	if t.a then																	-- if this date has an anchor year capture
		t.y = t.a;																-- use the anchor year capture when reassembling the date
	end

	if tonumber(t.m) then														-- if raw month is a number (converting from ymd)
		if 's' == mon_len then													-- if we are to use abbreviated month names
			t.m = cfg.date_names['inv_local_s'][tonumber(t.m)];					-- convert it to a month name
		else
			t.m = cfg.date_names['inv_local_l'][tonumber(t.m)];					-- convert it to a month name
		end
		t.d = t.d:gsub ('0(%d)', '%1');											-- strip leading '0' from day if present
	elseif 'ymd' == format_param then											-- when converting to ymd
		t.y = t.y:gsub ('%a', '');												-- strip CITREF disambiguator if present; anchor year already known so process can proceed; TODO: maint message?
		if 1582 > tonumber (t.y) then											-- ymd format dates not allowed before 1582
			return;
		end
		t.m = string.format ('%02d', get_month_number (t.m));					-- make sure that month and day are two digits
		t.d = string.format ('%02d', t.d);
	elseif mon_len then															-- if mon_len is set to either 'short' or 'long'
		for _, mon in ipairs ({'m', 'm2'}) do									-- because there can be two month names, check both 
			if t[mon] then
				t[mon] = get_month_number (t[mon]);								-- get the month number for this month (is length agnostic)
				if 0 == t[mon] then return; end									-- seasons and named dates can't be converted
				t[mon] = (('s' == mon_len) and cfg.date_names['inv_local_s'][t[mon]]) or cfg.date_names['inv_local_l'][t[mon]];	-- fetch month name according to length
			end
		end
	end

	local new_date = string.format (re_formats[pattern_idx][format_param][1],	-- format string
		t[re_formats[pattern_idx][format_param][2]],							-- named captures from t{}
		t[re_formats[pattern_idx][format_param][3]],
		t[re_formats[pattern_idx][format_param][4]],
		t[re_formats[pattern_idx][format_param][5]],
		t[re_formats[pattern_idx][format_param][6]],
		t[re_formats[pattern_idx][format_param][7]],
		t[re_formats[pattern_idx][format_param][8]]
		);

	return new_date;
end


--[[-------------------------< R E F O R M A T _ D A T E S >--------------------------------------------------

Reformats existing dates into the format specified by format.

format is one of several manual keywords: dmy, dmy-all, mdy, mdy-all, ymd, ymd-all.  The -all version includes
access- and archive-dates; otherwise these dates are not reformatted.

This function allows automatic date formatting.  In ~/Configuration, the article source is searched for one of
the {{use xxx dates}} templates.  If found, xxx becomes the global date format as xxx-all.  If |cs1-dates= in
{{use xxx dates}} has legitimate value then that value determines how cs1|2 dates will be rendered.  Legitimate
values for |cs1-dates= are:
	l - all dates are rendered with long month names
	ls - publication dates use long month names; access-/archive-dates use abbreviated month names
	ly - publication dates use long month names; access-/archive-dates rendered in ymd format
	s - all dates are rendered with abbreviated (short) month names
	sy - publication dates use abbreviated month names; access-/archive-dates rendered in ymd format
	y - all dates are rendered in ymd format

the format argument for automatic date formatting will be the format specified by {{use xxx dates}} with the
value supplied by |cs1-dates so one of: xxx-l, xxx-ls, xxx-ly, xxx-s, xxx-sy, xxx-y, or simply xxx (|cs1-dates=
empty, omitted, or invalid) where xxx shall be either of dmy or mdy.

dates are extracted from date_parameters_list, reformatted (if appropriate), and then written back into the
list in the new format.  Dates in date_parameters_list are presumed here to be valid (no errors).  This function
returns true when a date has been reformatted, false else.  Actual reformatting is done by reformatter().

]]

local function reformat_dates (date_parameters_list, format)
	local all = false;															-- set to false to skip access- and archive-dates
	local len_p = 'l';															-- default publication date length shall be long
	local len_a = 'l';															-- default access-/archive-date length shall be long
	local result = false;
	local new_date;																
	
	if format:match('%a+%-all') then											-- manual df keyword; auto df keyword when length not specified in {{use xxx dates}}; 
		format = format:match('(%a+)%-all');									-- extract the format
		all = true;																-- all dates are long format dates because this keyword doesn't specify length
	elseif format:match('%a+%-[lsy][sy]?') then									-- auto df keywords; internal only
		all = true;																-- auto df applies to all dates; use length specified by capture len_p for all dates
		format, len_p, len_a = format:match('(%a+)%-([lsy])([sy]?)');			-- extract the format and length keywords
		if 'y' == len_p then													-- because allowed by MOS:DATEUNIFY (sort of) range dates and My dates not reformatted
			format = 'ymd';														-- override {{use xxx dates}}
		elseif (not is_set(len_a)) or (len_p == len_a) then						-- no access-/archive-date length specified or same length as publication dates then
			len_a = len_p;														-- in case len_a not set
		end
	end																			-- else only publication dates and they are long

	for param_name, param_val in pairs (date_parameters_list) do				-- for each date-holding parameter in the list
		if is_set (param_val.val) then											-- if the parameter has a value
			if not (not all and in_array (param_name, {'access-date', 'archive-date'})) then	-- skip access- or archive-date unless format is xxx-all; yeah, ugly; TODO: find a better way
				for pattern_idx, pattern in pairs (patterns) do
					if mw.ustring.match (param_val.val, pattern[1]) then
						if all and in_array (param_name, {'access-date', 'archive-date'}) then	-- if this date is an access- or archive-date
							new_date = reformatter (param_val.val, pattern_idx, (('y' == len_a) and 'ymd') or format, len_a);	-- choose ymd or dmy/mdy according to len_a setting
						else													-- all other dates
							new_date = reformatter (param_val.val, pattern_idx, format, len_p);
						end
						
						if new_date then										-- set when date was reformatted
							date_parameters_list[param_name].val = new_date;	-- update date in date list
							result = true;										-- and announce that changes have been made
						end
					end	-- if
				end		-- for
			end			-- if
		end				-- if
	end					-- for
	return result;																-- declare boolean result and done
end


--[[--------------------------< 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|2
template 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 is_set (param_val.val) and
			not mw.ustring.match (param_val.val, patterns.ymd[1]) then			-- for those that are not ymd dates (ustring because here digits may not be Western)
				param_val.val, n = param_val.val:gsub ('%-', '–');				-- replace any hyphen with ndash
				if 0 ~= n then
					date_parameters_list[param_name].val = param_val.val;		-- update the list
					result = true;
				end
		end
	end
	return result;																-- so we know if any hyphens were replaced
end


--[[-------------------------< D A T E _ N A M E _ X L A T E >------------------------------------------------

Attempts to translate English month names to local-language month names using names supplied by MediaWiki's
date parser function.  This is simple name-for-name replacement and may not work for all languages.

if xlat_dig is true, this function will also translate Western (English) digits to the local language's digits.
This will also translate ymd dates.

]]

local function date_name_xlate (date_parameters_list, xlt_dig)
	local xlate;
	local mode;																	-- long or short month names
	local modified = false;
	local date;
	
	for param_name, param_val in pairs(date_parameters_list) do					-- for each date-holding parameter in the list
		if is_set(param_val.val) then											-- if the parameter has a value
			date = param_val.val;
			for month in mw.ustring.gmatch (date, '%a+') do						-- iterate through all dates in the date (single date or date range)
				if cfg.date_names.en.long[month] then
					mode = 'F';													-- English name is long so use long local name
				elseif cfg.date_names.en.short[month] then
					mode = 'M';													-- English name is short so use short local name
				else
					mode = nil;													-- not an English month name; could be local language month name or an English season name
				end
		
				if mode then													-- might be a season
					xlate = lang_object:formatDate(mode, '1' .. month);			-- translate the month name to this local language
					date = mw.ustring.gsub (date, month, xlate);				-- replace the English with the translation
					date_parameters_list[param_name].val = date;				-- save the translated date
					modified = true;
				end
			end

			if xlt_dig then														-- shall we also translate digits?
				date = date:gsub ('%d', cfg.date_names.xlate_digits);			-- translate digits from Western to 'local digits'
				date_parameters_list[param_name].val = date;					-- save the translated date
				modified = true;
			end
		end
	end
	
	return modified;
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 (cfg_table_ptr, utilities_page_ptr)
	add_prop_cat = utilities_page_ptr.add_prop_cat ;							-- import functions from selected Module:Citation/CS1/Utilities module
	is_set = utilities_page_ptr.is_set;
	in_array = utilities_page_ptr.in_array;
	set_message = utilities_page_ptr.set_message;
	substitute = utilities_page_ptr.substitute;
	wrap_style = utilities_page_ptr.wrap_style;

	cfg = cfg_table_ptr;														-- import tables from selected Module:Citation/CS1/Configuration
end


--[[--------------------------< E X P O R T E D   F U N C T I O N S >------------------------------------------
]]

return {																		-- return exported functions
	dates = dates,
	year_date_check = year_date_check,
	reformat_dates = reformat_dates,
	date_hyphen_to_dash = date_hyphen_to_dash,
	date_name_xlate = date_name_xlate,
	set_selected_modules = set_selected_modules
	}