Difference between revisions of "Module:Citation/CS1"

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Line 37: Line 37:
 
     end
 
     end
 
     return false;
 
     return false;
 +
end
 +
 +
--[[
 +
Categorize and emit an error message when the citation contains one or more deprecated parameters.  Because deprecated parameters (currently |day=, |month=,
 +
|coauthor=, and |coauthors=) aren't related to each other and because these parameters may be concatenated into the variables used by |date= and |author#= (and aliases)
 +
details of which parameter caused the error message are not provided.  Only one error message is emitted regarless of the number of deprecated parameters in the citation.
 +
]]
 +
function deprecated_parameter()
 +
if true ~= Page_in_deprecated_cat then -- if we haven't been here before then set a
 +
Page_in_deprecated_cat=true; -- sticky flag so that if there are more than one deprecated parameter the category is added only once
 +
table.insert( z.message_tail, { seterror( 'deprecated_params', {error_message}, true ) } ); -- add error message
 +
end
 
end
 
end
  
 
-- Populates numbered arguments in a message string using an argument table.
 
-- Populates numbered arguments in a message string using an argument table.
 
function substitute( msg, args )
 
function substitute( msg, args )
    return args and tostring( mw.message.newRawMessage( msg, args ) ) or msg;
+
-- return args and tostring( mw.message.newRawMessage( msg, args ) ) or msg;
 +
return args and mw.message.newRawMessage( msg, args ):plain() or msg;
 +
end
 +
 
 +
--[[
 +
Apply kerning to open the space between the quote mark provided by the Module and a leading or trailing quote mark contained in a |title= or |chapter= parameter's value.
 +
This function will positive kern  either single or double quotes:
 +
"'Unkerned title with leading and trailing single quote marks'"
 +
" 'Kerned title with leading and trailing single quote marks' " (in real life the kerning isn't as wide as this example)
 +
]]
 +
function kern_quotes (str)
 +
local left='<span style="padding-left:0.2em;">%1</span>'; -- spacing to use when title contains leading single or double quote mark
 +
local right='<span style="padding-right:0.2em;">%1</span>'; -- spacing to use when title contains trailing single or double quote mark
 +
 +
if  str:match ("^[\"\'][^\']") then
 +
str = string.gsub( str, "^[\"\']", left, 1 ); -- replace (captured) leading single or double quote with left-side <span>
 +
end
 +
if str:match ("[^\'][\"\']$") then
 +
str = string.gsub( str, "[\"\']$", right, 1 ); -- replace (captured) trailing single or double quote with right-side <span>
 +
end
 +
return str;
 
end
 
end
  
Line 105: Line 137:
 
end
 
end
  
-- Checks that parameter name is valid using the whitelist
+
--[[
 +
Looks for a parameter's name in the whitelist.
 +
 
 +
Parameters in the whitelist can have three values:
 +
true - active, supported parameters
 +
false - deprecated, supported parameters
 +
nil - unsupported parameters
 +
]]
 
function validate( name )
 
function validate( name )
    name = tostring( name );
+
local name = tostring( name );
   
+
local state = whitelist.basic_arguments[ name ];
    -- Normal arguments
+
    if whitelist.basic_arguments[ name ] then
+
-- Normal arguments
        return true;
+
if true == state then return true; end -- valid actively supported parameter
    end
+
if false == state then
   
+
deprecated_parameter (); -- parameter is deprecated but still supported
    -- Arguments with numbers in them
+
return true;
    name = name:gsub( "%d+", "#" );
+
end
    if whitelist.numbered_arguments[ name ] then
+
        return true;
+
-- Arguments with numbers in them
    end
+
name = name:gsub( "%d+", "#" ); -- replace digit(s) with # (last25 becomes last#
   
+
state = whitelist.numbered_arguments[ name ];
    -- Not found, argument not supported.
+
if true == state then return true; end -- valid actively supported parameter
    return false
+
if false == state then
 +
deprecated_parameter (); -- parameter is deprecated but still supported
 +
return true;
 +
end
 +
 +
return false; -- Not supported because not found or name is set to nil
 
end
 
end
  
Line 219: Line 263:
  
 
--[[
 
--[[
Formats a PMC and checks for embargoed articlesThe embargo parameter takes a date for a value. If the embargo date is in the futue
+
Format PMID and do simple error checkingPMIDs are sequential numbers beginning at 1 and counting up. This code checks the PMID to see that it
the PMC identifier will not be linked to the article.  If the embargo specifies a date in the past, or if it is empty or omitted, then
+
contains only digits and is less than test_limit; the value in local variable test_limit will need to be updated periodically as more PMIDs are issued.
the PMC identifier is linked to the article through the link at cfg.id_handlers['PMC'].link.
 
 
 
The {{citation/core}} version of {{cite journal}} links the citation title (if url parameter is empty) when embargo date is in the past
 
or when embargo parameter is missing or empty. That behavior is inconsistent with the behavior of other identifiers used in CS1 and is
 
not supported here.
 
 
]]
 
]]
function pmc(id, embargo)
+
function pmid(id)
local handler = cfg.id_handlers['PMC'];
+
local test_limit = 30000000; -- update this value as PMIDs approach
   
+
local handler = cfg.id_handlers['PMID'];
local text;
+
local err_cat =  ''; -- presume that PMID is valid
 +
 +
if id:match("[^%d]") then -- if PMID has anything but digits
 +
err_cat = ' ' .. seterror( 'bad_pmid' ); -- set an error message
 +
else -- PMID is only digits
 +
local id_num = tonumber(id); -- convert id to a number for range testing
 +
if 1 > id_num or test_limit < id_num then -- if PMID is outside test limit boundaries
 +
err_cat = ' ' .. seterror( 'bad_pmid' ); -- set an error message
 +
end
 +
end
 
 
 +
return externallinkid({link = handler.link, label = handler.label,
 +
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) .. err_cat;
 +
end
 +
 +
--[[
 +
Determines if a PMC identifier's online version is embargoed. Compares the date in |embargo= against today's date.  If embargo date is
 +
in the future, returns true; otherwse, returns false because the embargo has expired or |embargo= not set in this cite.
 +
]]
 +
function is_embargoed(embargo)
 
if is_set(embargo) then
 
if is_set(embargo) then
 
local lang = mw.getContentLanguage();
 
local lang = mw.getContentLanguage();
Line 237: Line 294:
 
good1, embargo_date = pcall( lang.formatDate, lang, 'U', embargo );
 
good1, embargo_date = pcall( lang.formatDate, lang, 'U', embargo );
 
good2, todays_date = pcall( lang.formatDate, lang, 'U' );
 
good2, todays_date = pcall( lang.formatDate, lang, 'U' );
 +
 +
if good1 and good2 and tonumber( embargo_date ) >= tonumber( todays_date ) then --is embargo date is in the future?
 +
return true; -- still embargoed
 +
end
 +
end
 +
return false; -- embargo expired or |embargo= not set
 +
end
  
if good1 and good2 and tonumber( embargo_date ) < tonumber( todays_date ) then --if embargo date is in the past then
+
--[[
text = externallinkid({link = handler.link, label = handler.label, --ok to link to article
+
Formats a PMC and checks for embargoed articles.  The embargo parameter takes a date for a value. If the embargo date is in the future
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
+
the PMC identifier will not be linked to the article.  If the embargo specifies a date in the past, or if it is empty or omitted, then
else
+
the PMC identifier is linked to the article through the link at cfg.id_handlers['PMC'].prefix.
text="[[" .. handler.link .. "|" .. handler.label .. "]]:" .. handler.separator .. id; --still embargoed so no external link
+
]]
end
+
function pmc(id, embargo)
 +
local handler = cfg.id_handlers['PMC'];
 +
   
 +
local text;
 +
 
 +
if is_embargoed(embargo) then
 +
text="[[" .. handler.link .. "|" .. handler.label .. "]]:" .. handler.separator .. id; --still embargoed so no external link
 
else
 
else
 
text = externallinkid({link = handler.link, label = handler.label, --no embargo date, ok to link to article
 
text = externallinkid({link = handler.link, label = handler.label, --no embargo date, ok to link to article
 
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
 
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
 
end
 
end
return text
+
return text;
 
end
 
end
  
Line 257: Line 327:
 
      
 
      
 
     local text;
 
     local text;
    if is_set(inactive) then
+
if is_set(inactive) then
        text = "[[" .. handler.link .. "|" .. handler.label .. "]]:" .. id;
+
local inactive_year = inactive:match("%d%d%d%d") or ''; -- try to get the year portion from the inactive date
        table.insert( z.error_categories, "Pages with DOIs inactive since " .. selectyear(inactive) );      
+
text = "[[" .. handler.link .. "|" .. handler.label .. "]]:" .. id;
        inactive = " (" .. cfg.messages['inactive'] .. " " .. inactive .. ")"  
+
if is_set(inactive_year) then
    else  
+
table.insert( z.error_categories, "Pages with DOIs inactive since " .. inactive_year );
        text = externallinkid({link = handler.link, label = handler.label,
+
else
            prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
+
table.insert( z.error_categories, "Pages with inactive DOIs" ); -- when inactive doesn't contain a recognizable year
        inactive = ""  
+
end
    end
+
inactive = " (" .. cfg.messages['inactive'] .. " " .. inactive .. ")"  
    if ( string.sub(id,1,3) ~= "10." ) then    
+
else  
        cat = seterror( 'bad_doi' );
+
text = externallinkid({link = handler.link, label = handler.label,
    end
+
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
    return text .. inactive .. cat  
+
inactive = ""  
 +
end
 +
 
 +
if nil == id:match("^10%.[^%s–]-[^%.,]$") then -- doi must begin with '10.', must not contain spaces or endashes, and must not end with period or comma
 +
cat = ' ' .. seterror( 'bad_doi' );
 +
end
 +
return text .. inactive .. cat  
 
end
 
end
  
Line 307: Line 383:
 
]]
 
]]
 
function issn(id)
 
function issn(id)
local clean_issn;
 
 
local issn_copy = id; -- save a copy of unadulterated issn; use this version for display if issn does not validate
 
local issn_copy = id; -- save a copy of unadulterated issn; use this version for display if issn does not validate
 
local handler = cfg.id_handlers['ISSN'];
 
local handler = cfg.id_handlers['ISSN'];
local temp = 0;
 
 
local text;
 
local text;
 
local valid_issn = true;
 
local valid_issn = true;
  
 
id=id:gsub( "[%s-–]", "" ); -- strip spaces, hyphens, and ndashes from the issn
 
id=id:gsub( "[%s-–]", "" ); -- strip spaces, hyphens, and ndashes from the issn
clean_issn=string.sub( id, 1, 4 ) .. "-" .. string.sub( id, 5 ); -- make a copy with a hyphen after 4 digits; use this version for display if issn validates
 
  
 
if 8 ~= id:len() or nil == id:match( "^%d*X?$" ) then -- validate the issn: 8 didgits long, containing only 0-9 or X in the last position
 
if 8 ~= id:len() or nil == id:match( "^%d*X?$" ) then -- validate the issn: 8 didgits long, containing only 0-9 or X in the last position
 
valid_issn=false; -- wrong length or improper character
 
valid_issn=false; -- wrong length or improper character
 
else
 
else
id = { id:byte(1, 8) }; -- table of individual bytes
+
valid_issn=is_valid_isxn(id, 8); -- validate issn
for i, v in ipairs( id ) do -- loop through all of the byte an calculate the checksum
 
if v == string.byte( "X" ) then -- if checkdigit is X
 
temp = temp + 10*( 9 - i ); -- it represents 10 decimal
 
else
 
temp = temp + tonumber( string.char(v) )*(9-i);
 
end
 
end
 
valid_issn = temp % 11 == 0; -- checksum must be zero for valid issn
 
 
end
 
end
  
 
if true == valid_issn then
 
if true == valid_issn then
id = clean_issn; -- if valid, use the cleaned-up version for the display
+
id = string.sub( id, 1, 4 ) .. "-" .. string.sub( id, 5 ); -- if valid, display correctly formatted version
 
else
 
else
 
id = issn_copy; -- if not valid, use the show the invalid issn with error message
 
id = issn_copy; -- if not valid, use the show the invalid issn with error message
Line 347: Line 412:
 
end
 
end
  
 +
--[[
 +
This function sets default title types (equivalent to the citation including |type=<default value>) for those citations that have defaults.
 +
Also handles the special case where it is desireable to omit the title type from the rendered citation (|type=none).
 +
]]
 +
function set_titletype(cite_class, title_type)
 +
if is_set(title_type) then
 +
if "none" == title_type then
 +
title_type = ""; -- if |type=none then type parameter not displayed
 +
end
 +
return title_type; -- if |type= has been set to any other value use that value
 +
end
  
--[[
+
if "podcast" == cite_class then -- if this citation is cite podcast
Determines whether an URL string is valid
+
return "Podcast"; -- display podcast annotation
  
At present the only check is whether the string appears to
+
elseif "pressrelease" == cite_class then -- if this citation is cite press release
be prefixed with a URI scheme.  It is not determined whether
+
return "Press release"; -- display press release annotation
the URI scheme is valid or whether the URL is otherwise well
 
formed.
 
]]
 
function checkurl( url_str )
 
    -- Protocol-relative or URL scheme
 
    return url_str:sub(1,2) == "//" or url_str:match( "^[^/]*:" ) ~= nil;
 
end
 
  
-- Removes irrelevant text and dashes from ISBN number
+
elseif "techreport" == cite_class then -- if this citation is cite techreport
-- Similar to that used for Special:BookSources
+
return "Technical report"; -- display techreport annotation
function cleanisbn( isbn_str )
+
    return isbn_str:gsub( "[^-0-9X]", "" );
+
elseif "thesis" == cite_class then -- if this citation is cite thesis (degree option handled after this function returns)
 +
return "Thesis"; -- display simple thesis annotation (without |degree= modification)
 +
end
 
end
 
end
  
-- Determines whether an ISBN string is valid
+
-- 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
function checkisbn( isbn_str )
+
function get_month_number (month)
    isbn_str = cleanisbn( isbn_str ):gsub( "-", "" );
+
local long_months = {['January']=1, ['February']=2, ['March']=3, ['April']=4, ['May']=5, ['June']=6, ['July']=7, ['August']=8, ['September']=9, ['October']=10, ['November']=11, ['December']=12};
    local len = isbn_str:len();
+
local short_months = {['Jan']=1, ['Feb']=2, ['Mar']=3, ['Apr']=4, ['May']=5, ['Jun']=6, ['Jul']=7, ['Aug']=8, ['Sep']=9, ['Oct']=10, ['Nov']=11, ['Dec']=12};
+
local temp;
    if len ~= 10 and len ~= 13 then
+
temp=long_months[month];
        return false;
+
if temp then return temp; end -- if month is the long-form name
    end
+
temp=short_months[month];
+
if temp then return temp; end -- if month is the short-form name
    local temp = 0;
+
return 0; -- misspelled, improper case, or not a month name
    if len == 10 then
 
        if isbn_str:match( "^%d*X?$" ) == nil then return false; end
 
        isbn_str = { isbn_str:byte(1, len) };
 
        for i, v in ipairs( isbn_str ) do
 
            if v == string.byte( "X" ) then
 
                temp = temp + 10*( 11 - i );
 
            else
 
                temp = temp + tonumber( string.char(v) )*(11-i);
 
            end
 
        end
 
        return temp % 11 == 0;
 
    else
 
        if isbn_str:match( "^%d*$" ) == nil then return false; end
 
        isbn_str = { isbn_str:byte(1, len) };
 
        for i, v in ipairs( isbn_str ) do
 
            temp = temp + (3 - 2*(i % 2)) * tonumber( string.char(v) );
 
        end
 
        return temp % 10 == 0;
 
    end
 
 
end
 
end
  
-- Gets the display text for a wikilink like [[A|B]] or [[B]] gives B
+
-- 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
function removewikilink( str )
+
function get_season_number (season)
    return (str:gsub( "%[%[([^%[%]]*)%]%]", function(l)
+
local season_list = {['Winter']=1, ['Spring']=2, ['Summer']=3, ['Fall']=4, ['Autumn']=4}
        return l:gsub( "^[^|]*|(.*)$", "%1" ):gsub("^%s*(.-)%s*$", "%1");
+
local temp;
    end));
+
temp=season_list[season];
 +
if temp then return temp; end -- if season is a valid name return its number
 +
return 0; -- misspelled, improper case, or not a season name
 
end
 
end
  
-- Escape sequences for content that will be used for URL descriptions
+
--[[
function safeforurl( str )
+
Returns true if day is less than or equal to the number of days in month; else returns false.
    if str:match( "%[%[.-%]%]" ) ~= nil then  
+
 
        table.insert( z.message_tail, { seterror( 'wikilink_in_url', {}, true ) } );
+
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.
    end
+
Where the two calendars overlap (1582 to approximately 1923) dates are assumed to be Gregorian.
   
+
]]
    return str:gsub( '[%[%]\n]', {   
+
function is_valid_date (year, month, day)
        ['['] = '&#91;',
+
local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        [']'] = '&#93;',
+
local month_length;
        ['\n'] = ' ' } );
+
if (2==month) then -- if February
 +
month_length = 28; -- then 28 days unless
 +
if 1582 > tonumber(year) then -- Julian calendar
 +
if 0==(year%4) then
 +
month_length = 29;
 +
end
 +
else -- Gregorian calendar
 +
if (0==(year%4) and (0~=(year%100) or 0==(year%400))) then -- is a leap year?
 +
month_length = 29; -- if leap year then 29 days in February
 +
end
 +
end
 +
else
 +
month_length=days_in_month[month];
 +
end
 +
 
 +
if tonumber (day) > month_length then
 +
return false;
 +
end
 +
return true;
 
end
 
end
  
-- Converts a hyphen to a dash
+
--[[
function hyphentodash( str )
+
Check a pair of months or seasons to see if both are valid members of a month or season pair.
    if not is_set(str) or str:match( "[%[%]{}<>]" ) ~= nil then
+
 
        return str;
+
Month pairs are expected to be left to right, earliest to latest in time.  Similarly, seasons are also left to right, earliest to latest in time.  There is
    end  
+
an oddity with seasons.  Winter is assigned a value of 1, spring 2, ..., fall and autumn 4.  Because winter can follow fall/autumn at the end of a calender year, a special test
    return str:gsub( '-', '–' );
+
is made to see if |date=Fall-Winter yyyy (4-1) is the date.
end
+
]]
  
-- Protects a string that will be wrapped in wiki italic markup '' ... ''
+
function is_valid_month_season_range(range_start, range_end)
function safeforitalics( str )
+
local range_start_number = get_month_number (range_start);
    --[[ Note: We can not use <i> for italics, as the expected behavior for
+
    italics specified by ''...'' in the title is that they will be inverted
+
if 0 == range_start_number then -- is this a month range?
    (i.e. unitalicized) in the resulting references.  In addition, <i> and ''
+
local range_start_number = get_season_number (range_start); -- not a month; is it a season? get start season number
    tend to interact poorly under Mediawiki's HTML tidy. ]]
+
local range_end_number = get_season_number (range_end); -- get end season number
   
+
 
    if not is_set(str) then
+
if 0 ~= range_start_number then -- is start of range a season?
        return str;
+
if range_start_number < range_end_number then -- range_start is a season
    else
+
return true; -- return true when range_end is also a season and follows start season; else false
        if str:sub(1,1) == "'" then str = "<span />" .. str; end
+
end
        if str:sub(-1,-1) == "'" then str = str .. "<span />"; end
+
if 4 == range_start_number and 1 == range_end_number then -- special case when range is Fall-Winter or Autumn-Winter
       
+
return true;
        -- Remove newlines as they break italics.
+
end
        return str:gsub( '\n', ' ' );
+
end
    end
+
return false; -- range_start is not a month or a season; or range_start is a season and range_end is not; or improper season sequence
 +
end
 +
 
 +
local range_end_number = get_month_number (range_end); -- get end month number
 +
if range_start_number < range_end_number then -- range_start is a month; does range_start precede range_end?
 +
return true; -- if yes, return true
 +
end
 +
return false; -- range_start month number is greater than or equal to range end number; or range end isn't a month
 
end
 
end
  
 
--[[
 
--[[
Joins a sequence of strings together while checking for duplicate separation
+
Check date format to see that it is one of the formats approved by MOS:DATE: MMMM D, YYYY; D MMMM YYYY; MMMM YYYY; YYYY-MM-DD; YYYY.
characters.
+
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.
 +
 
 +
If the date fails the fomat tests, this function returns false but 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 its year from the year parameter if present.
 +
 
 +
Inputs:
 +
date_string - date string from date-holding parameters (date, year, accessdate, embargo, archivedate, etc)
 +
 
 +
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 date_string without anchor_year disambiguator if any
 
]]
 
]]
function safejoin( tbl, duplicate_char )
+
function check_date (date_string)
    --[[
+
local year;
    Note: we use string functions here, rather than ustring functions.
+
local month=0; -- assume that month and day are not used; if either is zero then final year/month/day validation is not necessary
   
+
local day=0;
    This has considerably faster performance and should work correctly as
+
local day2=0; -- second day in a day range
    long as the duplicate_char is strict ASCII.  The strings
+
local anchor_year;
    in tbl may be ASCII or UTF8.
+
local coins_date;
    ]]
+
 
   
+
if date_string:match("^%d%d%d%d%-%d%d%-%d%d$") then -- Year-initial numerical year month day format
    local str = '';
+
year, month, day=string.match(date_string, "(%d%d%d%d)%-(%d%d)%-(%d%d)");
    local comp = '';
+
month=tonumber(month);
    local end_chr = '';
+
if 12 < month or 1 > month or 1583 > tonumber(year) then return false; end -- month number not valid or not Gregorian calendar
    local trim;
+
anchor_year = year;
    for _, value in ipairs( tbl ) do
+
 
        if value == nil then value = ''; end
+
elseif date_string:match("^%a+ +[1-9]%d?, +[1-9]%d%d%d%a?$") then -- month-initial: month day, year
       
+
month, day, anchor_year, year=string.match(date_string, "(%a+)%s*(%d%d?),%s*((%d%d%d%d)%a?)");
        if str == '' then
+
month = get_month_number (month);
            str = value;
+
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
        elseif value ~= '' then
+
            if value:sub(1,1) == '<' then
+
elseif date_string:match("^%a+ +[1-9]%d?–[1-9]%d?, +[1-9]%d%d%d%a?$") then -- month-initial day range: month day–day, year; days are separated by endash
                -- Special case of values enclosed in spans and other markup.
+
month, day, day2, anchor_year, year=string.match(date_string, "(%a+) +(%d%d?)–(%d%d?), +((%d%d%d%d)%a?)");
                comp = value:gsub( "%b<>", "" );
+
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;
            else
+
month = get_month_number (month);
                comp = value;
+
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
            end
+
 
           
+
elseif date_string:match("^[1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day-initial: day month year
            if comp:sub(1,1) == duplicate_char then
+
day, month, anchor_year, year=string.match(date_string, "(%d%d*)%s*(%a+)%s*((%d%d%d%d)%a?)");
                trim = false;
+
month = get_month_number (month);
                end_chr = str:sub(-1,-1);
+
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
                -- str = str .. "<HERE(enchr=" .. end_chr.. ")"
+
 
                if end_chr == duplicate_char then
+
elseif date_string:match("^[1-9]%d?–[1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day-range-initial: day–day month year; days are separated by endash
                    str = str:sub(1,-2);
+
day, day2, month, anchor_year, year=string.match(date_string, "(%d%d?)–(%d%d?) +(%a+) +((%d%d%d%d)%a?)");
                elseif end_chr == "'" then
+
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 str:sub(-3,-1) == duplicate_char .. "''" then
+
month = get_month_number (month);
                        str = str:sub(1, -4) .. "''";
+
if 0 == month then return false; end -- return false if month text isn't one of the twelve months
                    elseif str:sub(-5,-1) == duplicate_char .. "]]''" then
+
 
                        trim = true;
+
elseif mw.ustring.match (date_string, "^%a+–%a+ +[1-9]%d%d%d%a?$") then -- month/season range year; months separated by endash
                    elseif str:sub(-4,-1) == duplicate_char .. "]''" then
+
local month2
                        trim = true;
+
month, month2, anchor_year, year=mw.ustring.match (date_string, "(%a+)[%-/–](%a+)%s*((%d%d%d%d)%a?)");
                    end
+
if false == is_valid_month_season_range(month, month2) then
                elseif end_chr == "]" then
+
return false;
                    if str:sub(-3,-1) == duplicate_char .. "]]" then
+
end
                        trim = true;
+
                    elseif str:sub(-2,-1) == duplicate_char .. "]" then
+
elseif date_string:match("^%a+ +%d%d%d%d%a?$") then -- month/season year
                        trim = true;
+
month, anchor_year, year=string.match(date_string, "(%a+)%s*((%d%d%d%d)%a?)");
                    end
+
if 0 == get_month_number (month) then -- if month text isn't one of the twelve months, might be a season
                elseif end_chr == " " then
+
if 0 == get_season_number (month) then -- not a month, is it a season?
                    if str:sub(-2,-1) == duplicate_char .. " " then
+
return false; -- return false not a month or one of the five seasons
                        str = str:sub(1,-3);
+
end
                    end
+
end
                end
+
 
 +
elseif date_string:match("^[1-9]%d%d%d?%a?$") then -- year; here accept either YYY or YYYY
 +
anchor_year, year=string.match(date_string, "((%d%d%d%d?)%a?)");
 +
 
 +
else
 +
return false; -- date format not one of the MOS:DATE approved formats
 +
end
 +
 
 +
if 0~=month and 0~=day then -- check year month day dates for validity
 +
if 0~=day2 then -- If there is a second day (d–d Mmm YYYY or Mmm d–d, YYYY) test the second date
 +
if false==is_valid_date(year,month,day2) then
 +
return false; -- second date in date range string is not a real date return false; unset anchor_year and coins_date
 +
end -- if second date range string is valid, fall through to test the first date range
 +
end
 +
if false==is_valid_date(year,month,day) then
 +
return false; -- date string is not a real date return false; unset anchor_year and coins_date
 +
end
 +
end
 +
 
 +
coins_date= mw.ustring.gsub( date_string, "–", "-" ); -- if here, then date_string is valid; set coins_date and replace any ndash with a hyphen
 +
 +
return true, anchor_year, coins_date; -- format is good and date string represents a real date
 +
end
 +
 
 +
--[[
 +
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 and values for anchor_year (used in CITEREF identifiers) and COinS_date (used in the COinS metadata).  The |date= parameter test is unique.  This function only
 +
accepts anchor_year and COinS_date results from the |date= parameter test and |date= 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,
 +
a single error message is created as the dates are tested.
 +
]]
 +
 
 +
function dates(date_parameters_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 error_message ="";
 +
local good_date=false;
 +
 +
for k, v in pairs(date_parameters_list) do -- for each date-holding parameter in the list
 +
if is_set(v) then -- if the parameter has a value
 +
if v:match("^c%. [1-9]%d%d%d?%a?$") then -- special case for c. year or with or without CITEREF disambiguator - only |date= and |year=
 +
if 'date'==k then
 +
good_date, anchor_year, COinS_date = true, v:match("((c%. [1-9]d%d%d?)%a?)"); -- anchor year and COinS_date only from |date= parameter
 +
elseif 'year'==k then
 +
good_date = true;
 +
end
 +
elseif 'year'==k then -- if the parameter is |year= (but not c. year)
 +
if v:match("^[1-9]%d%d%d?%a?$") then -- year with or without CITEREF disambiguator
 +
good_date =  true;
 +
end
 +
elseif 'date'==k then -- if the parameter is |date=
 +
if v:match("n%.d%.%a?") then -- if |date=n.d. with or without a CITEREF disambiguator
 +
good_date, anchor_year, COinS_date = true, v:match("((n%.d%.)%a?)"); --"n.d."; no error when date parameter is set to no date
 +
elseif v:match("nd%a?$") then -- if |date=nd with or without a CITEREF disambiguator
 +
good_date, anchor_year, COinS_date = true, v:match("((nd)%a?)"); --"nd"; no error when date parameter is set to no date
 +
else
 +
good_date, anchor_year, COinS_date = check_date (v); -- go test the date
 +
end
 +
else -- any other date-holding parameter
 +
good_date = check_date (v); -- go test the date
 +
end
 +
if false==good_date then -- assemble one error message so we don't add the tracking category multiple times
 +
if is_set(error_message) then -- once we've added the first portion of the error message ...
 +
error_message=error_message .. ", "; -- ... add a comma space separator
 +
end
 +
error_message=error_message .. "&#124;" .. k .. "="; -- add the failed parameter
 +
end
 +
end
 +
end
 +
if is_set(error_message) then
 +
table.insert( z.message_tail, { seterror( 'bad_date', {error_message}, true ) } ); -- add this error message
 +
end
  
                if trim then
+
return anchor_year, COinS_date; -- and done
                    if value ~= comp then
+
end
                        local dup2 = duplicate_char;
 
                        if dup2:match( "%A" ) then dup2 = "%" .. dup2; end
 
                       
 
                        value = value:gsub( "(%b<>)" .. dup2, "%1", 1 )
 
                    else
 
                        value = value:sub( 2, -1 );
 
                    end
 
                end
 
            end
 
            str = str .. value;
 
        end
 
    end
 
    return str;
 
end
 
  
 
--[[
 
--[[
Return the year portion of a date string, if possible.   
+
Determines whether a URL string is valid
Returns empty string if the argument can not be interpreted
+
 
as a year.
+
At present the only check is whether the string appears to
 +
be prefixed with a URI schemeIt is not determined whether
 +
the URI scheme is valid or whether the URL is otherwise well
 +
formed.
 
]]
 
]]
function selectyear( str )
+
function checkurl( url_str )
     -- Is the input a simple number?
+
     -- Protocol-relative or URL scheme
    local num = tonumber( str );
+
     return url_str:sub(1,2) == "//" or url_str:match( "^[^/]*:" ) ~= nil;
     if num ~= nil and num > 0 and num < 2100 and num == math.floor(num) then
+
end
        return str;
+
 
    else
+
-- Removes irrelevant text and dashes from ISBN number
        -- Use formatDate to interpret more complicated formats
+
-- Similar to that used for Special:BookSources
        local lang = mw.getContentLanguage();
+
function cleanisbn( isbn_str )
        local good, result;
+
     return isbn_str:gsub( "[^-0-9X]", "" );
        good, result = pcall( lang.formatDate, lang, 'Y', str );
 
        if good then
 
            return result;
 
        else
 
            -- extract year if the date uses seasons
 
            str=string.lower (str);
 
            local seasons={"winter", "spring", "summer", "fall", "autumn"};
 
            local date_string_split=mw.text.split (str, "[%s%-/]");      -- split date string into parts; white space, hyphen, forward slash, and ndash are allowed separators
 
            local has_season=false;
 
           
 
            for n,season_value in ipairs(seasons) do                -- for each season ...
 
                for n,split_value in ipairs(date_string_split) do  -- ... loop through date string values
 
                    if split_value == season_value then            -- does the split value match the season value?
 
                        if has_season==false then                  -- found one. if this one is the first we've found ...
 
                            has_season=true;                        -- ... remember that we found a season
 
                        end
 
                    elseif has_season==true then                    -- if split_value isn't a season, and we've previously found a season ...
 
                        num = tonumber( split_value );              -- ... convert current split value to a number if we can
 
                        if num ~= nil and num > 0 and num < 2100 and num == math.floor(num) then    -- if it's a suitable number
 
                            return tostring( num );                                                -- return it as a string
 
                        end -- if num
 
                    end -- if string.find
 
                end -- for split value loop
 
            end -- season value loop
 
        end -- if good
 
    end -- if num
 
end -- selectyear
 
 
 
-- Attempts to convert names to initials.
 
function reducetoinitials(first)
 
     local initials = {}
 
    for word in string.gmatch(first, "%S+") do
 
        table.insert(initials, string.sub(word,1,1)) -- Vancouver format does not include full stops.
 
    end
 
    return table.concat(initials) -- Vancouver format does not include spaces.
 
 
end
 
end
  
-- Formats a list of people (e.g. authors / editors)
+
--[[
function listpeople(control, people)
+
ISBN-10 and ISSN validator code calculates checksum across all isbn/issn digits including the check digit. ISBN-13 is checked in checkisbn().
    local sep = control.sep;
+
If the number is valid the result will be 0. Before calling this function, issbn/issn must be checked for length and stripped of dashes,
    local namesep = control.namesep
+
spaces and other non-isxn characters.
    local format = control.format
+
]]
    local maximum = control.maximum
+
function is_valid_isxn (isxn_str, len)
     local lastauthoramp = control.lastauthoramp;
+
local temp = 0;
     local text = {}
+
isxn_str = { isxn_str:byte(1, len) }; -- make a table of bytes
     local etal = false;
+
len = len+1; -- adjust to be a loop counter
 +
for i, v in ipairs( isxn_str ) do -- loop through all of the bytes and calculate the checksum
 +
if v == string.byte( "X" ) then -- if checkdigit is X
 +
temp = temp + 10*( len - i ); -- it represents 10 decimal
 +
else
 +
temp = temp + tonumber( string.char(v) )*(len-i);
 +
end
 +
end
 +
return temp % 11 == 0; -- returns true if calculation result is zero
 +
end
 +
 
 +
-- Determines whether an ISBN string is valid
 +
function checkisbn( isbn_str )
 +
if nil ~= isbn_str:match("[^%s-0-9X]") then return false; end -- fail if isbn_str contains anything but digits, hyphens, or the uppercase X
 +
isbn_str = isbn_str:gsub( "-", "" ):gsub( " ", "" ); -- remove hyphens and spaces
 +
local len = isbn_str:len();
 +
 +
if len ~= 10 and len ~= 13 then
 +
return false;
 +
end
 +
 
 +
if len == 10 then
 +
if isbn_str:match( "^%d*X?$" ) == nil then return false; end
 +
return is_valid_isxn(isbn_str, 10);
 +
else
 +
local temp = 0;
 +
if isbn_str:match( "^97[89]%d*$" ) == nil then return false; end -- isbn13 begins with 978 or 979
 +
isbn_str = { isbn_str:byte(1, len) };
 +
for i, v in ipairs( isbn_str ) do
 +
temp = temp + (3 - 2*(i % 2)) * tonumber( string.char(v) );
 +
end
 +
return temp % 10 == 0;
 +
end
 +
end
 +
 
 +
-- Gets the display text for a wikilink like [[A|B]] or [[B]] gives B
 +
function removewikilink( str )
 +
     return (str:gsub( "%[%[([^%[%]]*)%]%]", function(l)
 +
        return l:gsub( "^[^|]*|(.*)$", "%1" ):gsub("^%s*(.-)%s*$", "%1");
 +
     end));
 +
end
 +
 
 +
-- Escape sequences for content that will be used for URL descriptions
 +
function safeforurl( str )
 +
    if str:match( "%[%[.-%]%]" ) ~= nil then
 +
        table.insert( z.message_tail, { seterror( 'wikilink_in_url', {}, true ) } );
 +
     end
 
      
 
      
     if sep:sub(-1,-1) ~= " " then sep = sep .. " " end
+
     return str:gsub( '[%[%]\n]', {   
     if maximum ~= nil and maximum < 1 then return "", 0; end
+
        ['['] = '&#91;',
 +
        [']'] = '&#93;',
 +
        ['\n'] = ' ' } );
 +
end
 +
 
 +
-- Converts a hyphen to a dash
 +
function hyphentodash( str )
 +
     if not is_set(str) or str:match( "[%[%]{}<>]" ) ~= nil then
 +
        return str;
 +
    end   
 +
    return str:gsub( '-', '–' );
 +
end
 +
 
 +
-- Protects a string that will be wrapped in wiki italic markup '' ... ''
 +
function safeforitalics( str )
 +
    --[[ Note: We can not use <i> for italics, as the expected behavior for
 +
    italics specified by ''...'' in the title is that they will be inverted
 +
    (i.e. unitalicized) in the resulting references.  In addition, <i> and ''
 +
    tend to interact poorly under Mediawiki's HTML tidy. ]]
 
      
 
      
     for i,person in ipairs(people) do
+
     if not is_set(str) then
         if is_set(person.last) then
+
        return str;
            local mask = person.mask
+
    else
            local one
+
         if str:sub(1,1) == "'" then str = "<span />" .. str; end
            local sep_one = sep;
+
        if str:sub(-1,-1) == "'" then str = str .. "<span />"; end
            if maximum ~= nil and i > maximum then
+
       
                etal = true;
+
        -- Remove newlines as they break italics.
                break;
+
        return str:gsub( '\n', ' ' );
            elseif (mask ~= nil) then
+
    end
                local n = tonumber(mask)
+
end
                 if (n ~= nil) then
+
 
                    one = string.rep("&mdash;",n)
+
--[[
                else
+
Joins a sequence of strings together while checking for duplicate separation
                    one = mask;
+
characters.
                    sep_one = " ";
+
]]
                end
+
function safejoin( tbl, duplicate_char )
 +
    --[[
 +
    Note: we use string functions here, rather than ustring functions.
 +
   
 +
    This has considerably faster performance and should work correctly as
 +
    long as the duplicate_char is strict ASCII.  The strings
 +
    in tbl may be ASCII or UTF8.
 +
    ]]
 +
   
 +
    local str = '';
 +
    local comp = '';
 +
    local end_chr = '';
 +
    local trim;
 +
    for _, value in ipairs( tbl ) do
 +
        if value == nil then value = ''; end
 +
       
 +
        if str == '' then
 +
            str = value;
 +
        elseif value ~= '' then
 +
            if value:sub(1,1) == '<' then
 +
                 -- Special case of values enclosed in spans and other markup.
 +
                comp = value:gsub( "%b<>", "" );
 
             else
 
             else
                 one = person.last
+
                 comp = value;
                local first = person.first
 
                if is_set(first) then
 
                    if ( "vanc" == format ) then first = reducetoinitials(first) end
 
                    one = one .. namesep .. first
 
                end
 
                if is_set(person.link) then one = "[[" .. person.link .. "|" .. one .. "]]" end
 
 
             end
 
             end
             table.insert( text, one )
+
              
            table.insert( text, sep_one )
+
            if comp:sub(1,1) == duplicate_char then
        end
+
                trim = false;
    end
+
                end_chr = str:sub(-1,-1);
 
+
                -- str = str .. "<HERE(enchr=" .. end_chr.. ")"
    local count = #text / 2;
+
                if end_chr == duplicate_char then
    if count > 0 then  
+
                    str = str:sub(1,-2);
        if count > 1 and is_set(lastauthoramp) and not etal then
+
                elseif end_chr == "'" then
            text[#text-2] = " & ";
+
                    if str:sub(-3,-1) == duplicate_char .. "''" then
        end
+
                        str = str:sub(1, -4) .. "''";
        text[#text] = nil;  
+
                    elseif str:sub(-5,-1) == duplicate_char .. "]]''" then
    end
+
                        trim = true;
   
+
                    elseif str:sub(-4,-1) == duplicate_char .. "]''" then
    local result = table.concat(text) -- construct list
+
                        trim = true;
    if etal then  
+
                    end
        local etal_text = cfg.messages['et al'];
+
                elseif end_chr == "]" then
        result = result .. " " .. etal_text;
+
                    if str:sub(-3,-1) == duplicate_char .. "]]" then
    end
+
                        trim = true;
   
+
                    elseif str:sub(-2,-1) == duplicate_char .. "]" then
    -- if necessary wrap result in <span> tag to format in Small Caps
+
                        trim = true;
    if ( "scap" == format ) then result =  
+
                    end
        '<span class="smallcaps" style="font-variant:small-caps">' .. result .. '</span>';
+
                elseif end_chr == " " then
    end  
+
                    if str:sub(-2,-1) == duplicate_char .. " " then
    return result, count
+
                        str = str:sub(1,-3);
end
+
                    end
 +
                end
  
-- Generates a CITEREF anchor ID.
+
                if trim then
function anchorid( options )
+
                    if value ~= comp then
     return "CITEREF" .. table.concat( options );
+
                        local dup2 = duplicate_char;
 +
                        if dup2:match( "%A" ) then dup2 = "%" .. dup2; end
 +
                       
 +
                        value = value:gsub( "(%b<>)" .. dup2, "%1", 1 )
 +
                    else
 +
                        value = value:sub( 2, -1 );
 +
                    end
 +
                end
 +
            end
 +
            str = str .. value;
 +
        end
 +
    end
 +
    return str;
 +
end 
 +
 
 +
-- Attempts to convert names to initials.
 +
function reducetoinitials(first)
 +
     local initials = {}
 +
    for word in string.gmatch(first, "%S+") do
 +
        table.insert(initials, string.sub(word,1,1)) -- Vancouver format does not include full stops.
 +
    end
 +
    return table.concat(initials) -- Vancouver format does not include spaces.
 
end
 
end
  
-- Gets name list from the input arguments
+
-- Formats a list of people (e.g. authors / editors)
function extractnames(args, list_name)
+
function listpeople(control, people)
     local names = {};
+
     local sep = control.sep;
     local i = 1;
+
    local namesep = control.namesep
     local last;
+
    local format = control.format
 +
    local maximum = control.maximum
 +
    local lastauthoramp = control.lastauthoramp;
 +
    local text = {}
 +
     local etal = false;
 +
   
 +
    if sep:sub(-1,-1) ~= " " then sep = sep .. " " end
 +
     if maximum ~= nil and maximum < 1 then return "", 0; end
 
      
 
      
     while true do
+
     for i,person in ipairs(people) do
        last = selectone( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', i );
+
         if is_set(person.last) then
         if not is_set(last) then
+
             local mask = person.mask
             -- just in case someone passed in an empty parameter
+
            local one
             break;
+
             local sep_one = sep;
        end
+
            if maximum ~= nil and i > maximum then
        names[i] = {
+
                etal = true;
             last = last,
+
                break;
            first = selectone( args, cfg.aliases[list_name .. '-First'], 'redundant_parameters', i ),
+
             elseif (mask ~= nil) then
            link = selectone( args, cfg.aliases[list_name .. '-Link'], 'redundant_parameters', i ),
+
                local n = tonumber(mask)
            mask = selectone( args, cfg.aliases[list_name .. '-Mask'], 'redundant_parameters', i )
+
                if (n ~= nil) then
        };
+
                    one = string.rep("&mdash;",n)
        i = i + 1;
+
                else
    end
+
                    one = mask;
    return names;
+
                    sep_one = " ";
end
+
                end
 
+
            else
-- Populates ID table from arguments using configuration settings
+
                one = person.last
function extractids( args )
+
                local first = person.first
    local id_list = {};
+
                if is_set(first) then
    for k, v in pairs( cfg.id_handlers ) do   
+
                    if ( "vanc" == format ) then first = reducetoinitials(first) end
        v = selectone( args, v.parameters, 'redundant_parameters' );
+
                    one = one .. namesep .. first
         if is_set(v) then id_list[k] = v; end
+
                end
 +
                if is_set(person.link) then one = "[[" .. person.link .. "|" .. one .. "]]" end
 +
            end
 +
            table.insert( text, one )
 +
            table.insert( text, sep_one )
 +
         end
 
     end
 
     end
    return id_list;
 
end
 
  
-- Takes a table of IDs and turns it into a table of formatted ID outputs.
+
    local count = #text / 2;
function buildidlist( id_list, options )
+
    if count > 0 then
    local new_list, handler = {};
+
        if count > 1 and is_set(lastauthoramp) and not etal then
 +
            text[#text-2] = " & ";
 +
        end
 +
        text[#text] = nil;  
 +
    end
 
      
 
      
     function fallback(k) return { __index = function(t,i) return cfg.id_handlers[k][i] end } end;
+
     local result = table.concat(text) -- construct list
 +
    if etal then
 +
        local etal_text = cfg.messages['et al'];
 +
        result = result .. " " .. etal_text;
 +
    end
 
      
 
      
     for k, v in pairs( id_list ) do
+
     -- if necessary wrap result in <span> tag to format in Small Caps
        -- fallback to read-only cfg
+
    if ( "scap" == format ) then result =
        handler = setmetatable( { ['id'] = v }, fallback(k) );
+
         '<span class="smallcaps" style="font-variant:small-caps">' .. result .. '</span>';
          
+
    end
        if handler.mode == 'external' then
+
    return result, count
            table.insert( new_list, {handler.label, externallinkid( handler ) } );
+
end
        elseif handler.mode == 'internal' then
+
 
            table.insert( new_list, {handler.label, internallinkid( handler ) } );
+
-- Generates a CITEREF anchor ID.
        elseif handler.mode ~= 'manual' then
+
function anchorid( options )
            error( cfg.messages['unknown_ID_mode'] );
+
    return "CITEREF" .. table.concat( options );
        elseif k == 'DOI' then
+
end
            table.insert( new_list, {handler.label, doi( v, options.DoiBroken ) } );
+
 
        elseif k == 'ASIN' then
+
-- Gets name list from the input arguments
            table.insert( new_list, {handler.label, amazon( v, options.ASINTLD ) } );
+
function extractnames(args, list_name)
        elseif k == 'OL' then
+
    local names = {};
            table.insert( new_list, {handler.label, openlibrary( v ) } );
+
    local i = 1;
        elseif k == 'PMC' then
+
    local last;
            table.insert( new_list, {handler.label, pmc( v, options.Embargo ) } );
 
        elseif k == 'ISSN' then
 
        table.insert( new_list, {handler.label, issn( v ) } );
 
        elseif k == 'ISBN' then
 
            local ISBN = internallinkid( handler );
 
            if not checkisbn( v ) and not is_set(options.IgnoreISBN) then
 
                ISBN = ISBN .. seterror( 'bad_isbn', {}, false, " ", "" );
 
            end
 
            table.insert( new_list, {handler.label, ISBN } );              
 
        else
 
            error( cfg.messages['unknown_manual_ID'] );
 
        end
 
    end
 
 
      
 
      
     function comp( a, b )
+
     while true do
         return a[1] < b[1];
+
        last = selectone( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', i );
 +
        if not is_set(last) then
 +
            -- just in case someone passed in an empty parameter
 +
            break;
 +
        end
 +
         names[i] = {
 +
            last = last,
 +
            first = selectone( args, cfg.aliases[list_name .. '-First'], 'redundant_parameters', i ),
 +
            link = selectone( args, cfg.aliases[list_name .. '-Link'], 'redundant_parameters', i ),
 +
            mask = selectone( args, cfg.aliases[list_name .. '-Mask'], 'redundant_parameters', i )
 +
        };
 +
        i = i + 1;
 
     end
 
     end
      
+
     return names;
    table.sort( new_list, comp );
+
end
     for k, v in ipairs( new_list ) do
+
 
         new_list[k] = v[2];
+
-- Populates ID table from arguments using configuration settings
 +
function extractids( args )
 +
    local id_list = {};
 +
     for k, v in pairs( cfg.id_handlers ) do  
 +
         v = selectone( args, v.parameters, 'redundant_parameters' );
 +
        if is_set(v) then id_list[k] = v; end
 
     end
 
     end
   
+
     return id_list;
     return new_list;
 
 
end
 
end
 
+
 
-- Chooses one matching parameter from a list of parameters to consider
+
-- Takes a table of IDs and turns it into a table of formatted ID outputs.
-- Generates an error if more than one match is present.
+
function buildidlist( id_list, options )
function selectone( args, possible, error_condition, index )
+
     local new_list, handler = {};
     local value = nil;
 
    local selected = '';
 
    local error_list = {};
 
 
      
 
      
     if index ~= nil then index = tostring(index); end
+
     function fallback(k) return { __index = function(t,i) return cfg.id_handlers[k][i] end } end;
 
      
 
      
     -- Handle special case of "#" replaced by empty string
+
     for k, v in pairs( id_list ) do
    if index == '1' then
+
        -- fallback to read-only cfg
        for _, v in ipairs( possible ) do
+
        handler = setmetatable( { ['id'] = v }, fallback(k) );
             v = v:gsub( "#", "" );
+
       
             if is_set(args[v]) then
+
        if handler.mode == 'external' then
                if value ~= nil and selected ~= v then
+
            table.insert( new_list, {handler.label, externallinkid( handler ) } );
                    table.insert( error_list, v );
+
        elseif handler.mode == 'internal' then
                else
+
             table.insert( new_list, {handler.label, internallinkid( handler ) } );
                    value = args[v];
+
        elseif handler.mode ~= 'manual' then
                    selected = v;
+
             error( cfg.messages['unknown_ID_mode'] );
                 end
+
        elseif k == 'DOI' then
 +
            table.insert( new_list, {handler.label, doi( v, options.DoiBroken ) } );
 +
        elseif k == 'ASIN' then
 +
            table.insert( new_list, {handler.label, amazon( v, options.ASINTLD ) } );
 +
        elseif k == 'OL' then
 +
            table.insert( new_list, {handler.label, openlibrary( v ) } );
 +
        elseif k == 'PMC' then
 +
            table.insert( new_list, {handler.label, pmc( v, options.Embargo ) } );
 +
        elseif k == 'PMID' then
 +
            table.insert( new_list, {handler.label, pmid( v ) } );
 +
        elseif k == 'ISSN' then
 +
        table.insert( new_list, {handler.label, issn( v ) } );
 +
        elseif k == 'ISBN' then
 +
            local ISBN = internallinkid( handler );
 +
            if not checkisbn( v ) and not is_set(options.IgnoreISBN) then
 +
                 ISBN = ISBN .. seterror( 'bad_isbn', {}, false, " ", "" );
 
             end
 
             end
         end      
+
            table.insert( new_list, {handler.label, ISBN } );               
 +
        else
 +
            error( cfg.messages['unknown_manual_ID'] );
 +
         end
 
     end
 
     end
 
      
 
      
     for _, v in ipairs( possible ) do
+
     function comp( a, b ) -- used in following table.sort()
         if index ~= nil then
+
         return a[1] < b[1];
            v = v:gsub( "#", index );
 
        end
 
        if is_set(args[v]) then
 
            if value ~= nil and selected ~=  v then
 
                table.insert( error_list, v );
 
            else
 
                value = args[v];
 
                selected = v;
 
            end
 
        end
 
 
     end
 
     end
 
      
 
      
     if #error_list > 0 then
+
     table.sort( new_list, comp );
        local error_str = "";
+
    for k, v in ipairs( new_list ) do
        for _, k in ipairs( error_list ) do
+
        new_list[k] = v[2];
            if error_str ~= "" then error_str = error_str .. cfg.messages['parameter-separator'] end
 
            error_str = error_str .. wrap( 'parameter', k );
 
        end
 
        if #error_list > 1 then
 
            error_str = error_str .. cfg.messages['parameter-final-separator'];
 
        else
 
            error_str = error_str .. cfg.messages['parameter-pair-separator'];
 
        end
 
        error_str = error_str .. wrap( 'parameter', selected );
 
        table.insert( z.message_tail, { seterror( error_condition, {error_str}, true ) } );
 
 
     end
 
     end
 
      
 
      
     return value, selected;
+
     return new_list;
 
end
 
end
 
+
 
-- COinS metadata (see <http://ocoins.info/>) allows automated tools to parse
+
-- Chooses one matching parameter from a list of parameters to consider
-- the citation information.
+
-- Generates an error if more than one match is present.
function COinS(data)
+
function selectone( args, possible, error_condition, index )
     if 'table' ~= type(data) or nil == next(data) then
+
     local value = nil;
        return '';
+
    local selected = '';
     end
+
     local error_list = {};
 
      
 
      
     local ctx_ver = "Z39.88-2004";
+
     if index ~= nil then index = tostring(index); end
 
      
 
      
     -- treat table strictly as an array with only set values.
+
     -- Handle special case of "#" replaced by empty string
     local OCinSoutput = setmetatable( {}, {
+
     if index == '1' then
        __newindex = function(self, key, value)
+
        for _, v in ipairs( possible ) do
             if is_set(value) then
+
            v = v:gsub( "#", "" );
                 rawset( self, #self+1, table.concat{ key, '=', mw.uri.encode( removewikilink( value ) ) } );
+
             if is_set(args[v]) then
 +
                 if value ~= nil and selected ~= v then
 +
                    table.insert( error_list, v );
 +
                else
 +
                    value = args[v];
 +
                    selected = v;
 +
                end
 +
            end
 +
        end       
 +
    end
 +
   
 +
    for _, v in ipairs( possible ) do
 +
        if index ~= nil then
 +
            v = v:gsub( "#", index );
 +
        end
 +
        if is_set(args[v]) then
 +
            if value ~= nil and selected ~=  v then
 +
                table.insert( error_list, v );
 +
            else
 +
                value = args[v];
 +
                selected = v;
 
             end
 
             end
 
         end
 
         end
     });
+
     end
 
      
 
      
     if is_set(data.Chapter) then
+
     if #error_list > 0 then
         OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
+
         local error_str = "";
         OCinSoutput["rft.genre"] = "bookitem";
+
         for _, k in ipairs( error_list ) do
        OCinSoutput["rft.btitle"] = data.Chapter;
+
            if error_str ~= "" then error_str = error_str .. cfg.messages['parameter-separator'] end
        OCinSoutput["rft.atitle"] = data.Title;
+
            error_str = error_str .. wrap( 'parameter', k );
    elseif is_set(data.Periodical) then
+
         end
         OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:journal";
+
         if #error_list > 1 then
         OCinSoutput["rft.genre"] = "article";
+
            error_str = error_str .. cfg.messages['parameter-final-separator'];
         OCinSoutput["rft.jtitle"] = data.Periodical;
+
         else
        OCinSoutput["rft.atitle"] = data.Title;
+
            error_str = error_str .. cfg.messages['parameter-pair-separator'];
    else
+
        end
         OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
+
         error_str = error_str .. wrap( 'parameter', selected );
         OCinSoutput["rft.genre"] = "book"
+
         table.insert( z.message_tail, { seterror( error_condition, {error_str}, true ) } );
        OCinSoutput["rft.btitle"] = data.Title;
 
 
     end
 
     end
 
      
 
      
     OCinSoutput["rft.place"] = data.PublicationPlace;
+
     return value, selected;
    OCinSoutput["rft.date"] = data.Date;
+
end
    OCinSoutput["rft.series"] = data.Series;
+
 
     OCinSoutput["rft.volume"] = data.Volume;
+
-- COinS metadata (see <http://ocoins.info/>) allows automated tools to parse
    OCinSoutput["rft.issue"] = data.Issue;
+
-- the citation information.
    OCinSoutput["rft.pages"] = data.Pages;
+
function COinS(data)
    OCinSoutput["rft.edition"] = data.Edition;
+
     if 'table' ~= type(data) or nil == next(data) then
     OCinSoutput["rft.pub"] = data.PublisherName;
+
        return '';
 +
     end
 
      
 
      
     for k, v in pairs( data.ID_list ) do
+
     local ctx_ver = "Z39.88-2004";
        local id, value = cfg.id_handlers[k].COinS;
 
        if k == 'ISBN' then value = cleanisbn( v ); else value = v; end
 
        if string.sub( id or "", 1, 4 ) == 'info' then
 
            OCinSoutput["rft_id"] = table.concat{ id, "/", v };
 
        else
 
            OCinSoutput[ id ] = value;
 
        end
 
    end
 
 
      
 
      
     local last, first;
+
     -- treat table strictly as an array with only set values.
     for k, v in ipairs( data.Authors ) do
+
     local OCinSoutput = setmetatable( {}, {
         last, first = v.last, v.first;
+
         __newindex = function(self, key, value)
        if k == 1 then
+
             if is_set(value) then
             if is_set(last) then
+
                 rawset( self, #self+1, table.concat{ key, '=', mw.uri.encode( removewikilink( value ) ) } );
                 OCinSoutput["rft.aulast"] = last;
 
            end
 
            if is_set(first) then
 
                OCinSoutput["rft.aufirst"] = first;
 
 
             end
 
             end
 
         end
 
         end
        if is_set(last) and is_set(first) then
+
    });
            OCinSoutput["rft.au"] = table.concat{ last, ", ", first };
 
        elseif is_set(last) then
 
            OCinSoutput["rft.au"] = last;
 
        end
 
    end
 
 
      
 
      
     OCinSoutput.rft_id = data.URL;
+
     if is_set(data.Chapter) then
    OCinSoutput.rfr_id = table.concat{ "info:sid/", mw.site.server:match( "[^/]*$" ), ":", data.RawPage };
+
        OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
    OCinSoutput = setmetatable( OCinSoutput, nil );
+
        OCinSoutput["rft.genre"] = "bookitem";
      
+
        OCinSoutput["rft.btitle"] = data.Chapter;
    -- sort with version string always first, and combine.
+
        OCinSoutput["rft.atitle"] = data.Title;
    table.sort( OCinSoutput );
+
     elseif is_set(data.Periodical) then
    table.insert( OCinSoutput, 1, "ctx_ver=" .. ctx_ver ); -- such as "Z39.88-2004"
+
        OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:journal";
     return table.concat(OCinSoutput, "&");
+
        OCinSoutput["rft.genre"] = "article";
end
+
        OCinSoutput["rft.jtitle"] = data.Periodical;
 
+
        OCinSoutput["rft.atitle"] = data.Title;
--[[
+
     else
This is the main function foing the majority of the citation
+
        OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
formatting.
+
        OCinSoutput["rft.genre"] = "book"
]]
+
        OCinSoutput["rft.btitle"] = data.Title;
function citation0( config, args)
+
     end
    --[[  
+
      
     Load Input Parameters
+
     OCinSoutput["rft.place"] = data.PublicationPlace;
     The argment_wrapper facillitates the mapping of multiple
+
     OCinSoutput["rft.date"] = data.Date;
     aliases to single internal variable.
+
     OCinSoutput["rft.series"] = data.Series;
     ]]
+
     OCinSoutput["rft.volume"] = data.Volume;
     local A = argument_wrapper( args );
+
     OCinSoutput["rft.issue"] = data.Issue;
 
+
     OCinSoutput["rft.pages"] = data.Pages;
     local i
+
     OCinSoutput["rft.edition"] = data.Edition;
     local PPrefix = A['PPrefix']
+
    OCinSoutput["rft.pub"] = data.PublisherName;
     local PPPrefix = A['PPPrefix']
 
     if is_set( A['NoPP'] ) then PPPrefix = "" PPrefix = "" end
 
 
      
 
      
     -- Pick out the relevant fields from the arguments.  Different citation templates
+
     for k, v in pairs( data.ID_list ) do
    -- define different field names for the same underlying things.  
+
        local id, value = cfg.id_handlers[k].COinS;
    local Authors = A['Authors'];
+
        if k == 'ISBN' then value = cleanisbn( v ); else value = v; end
    local a = extractnames( args, 'AuthorList' );
+
        if string.sub( id or "", 1, 4 ) == 'info' then
 
+
            OCinSoutput["rft_id"] = table.concat{ id, "/", v };
    local Coauthors = A['Coauthors'];
+
        else
    local Others = A['Others'];
+
            OCinSoutput[ id ] = value;
    local Editors = A['Editors'];
+
        end
    local e = extractnames( args, 'EditorList' );
+
     end
 
+
      
    local Year = A['Year'];
+
     local last, first;
    local PublicationDate = A['PublicationDate'];
+
     for k, v in ipairs( data.Authors ) do
    local OrigYear = A['OrigYear'];
+
        last, first = v.last, v.first;
    local Date = A['Date'];
+
        if k == 1 then
    local LayDate = A['LayDate'];
+
            if is_set(last) then
    ------------------------------------------------- Get title data
+
                OCinSoutput["rft.aulast"] = last;
    local Title = A['Title'];
+
            end
    local BookTitle = A['BookTitle'];
+
            if is_set(first) then
    local Conference = A['Conference'];
+
                OCinSoutput["rft.aufirst"] = first;
     local TransTitle = A['TransTitle'];
+
            end
     local TitleNote = A['TitleNote'];
+
        end
     local TitleLink = A['TitleLink'];
+
         if is_set(last) and is_set(first) then
     local Chapter = A['Chapter'];
+
            OCinSoutput["rft.au"] = table.concat{ last, ", ", first };
    local ChapterLink = A['ChapterLink'];
+
        elseif is_set(last) then
    local TransChapter = A['TransChapter'];
+
             OCinSoutput["rft.au"] = last;
    local TitleType = A['TitleType'];
 
    local ArchiveURL = A['ArchiveURL'];
 
    local URL = A['URL']
 
    local URLorigin = A:ORIGIN('URL');
 
    local ChapterURL = A['ChapterURL'];
 
    local ChapterURLorigin = A:ORIGIN('ChapterURL');
 
    local ConferenceURL = A['ConferenceURL'];
 
    local ConferenceURLorigin = A:ORIGIN('ConferenceURL');
 
    local Periodical = A['Periodical'];
 
   
 
    if ( config.CitationClass == "encyclopaedia" ) then
 
         if not is_set(Chapter) then
 
            if not is_set(Title) then
 
                Title = Periodical;
 
                Periodical = '';
 
             else
 
                Chapter = Title
 
                TransChapter = TransTitle
 
                Title = '';
 
                TransTitle = '';
 
            end
 
 
         end
 
         end
 
     end
 
     end
 
    local Series = A['Series'];
 
    local Volume = A['Volume'];
 
    local Issue = A['Issue'];
 
    local Position = '';
 
    local Page, Pages, At, page_type;
 
 
      
 
      
     Page = A['Page'];
+
     OCinSoutput.rft_id = data.URL;
     Pages = hyphentodash( A['Pages'] );
+
     OCinSoutput.rfr_id = table.concat{ "info:sid/", mw.site.server:match( "[^/]*$" ), ":", data.RawPage };
     At = A['At'];
+
     OCinSoutput = setmetatable( OCinSoutput, nil );
 
      
 
      
     if is_set(Page) then
+
     -- sort with version string always first, and combine.
        if is_set(Pages) or is_set(At) then
+
    table.sort( OCinSoutput );
            Page = Page .. " " .. seterror('extra_pages');
+
    table.insert( OCinSoutput, 1, "ctx_ver=" .. ctx_ver );  -- such as "Z39.88-2004"
            Pages = '';
+
    return table.concat(OCinSoutput, "&");
            At = '';
+
end
        end
+
 
     elseif is_set(Pages) then
+
--[[
        if is_set(At) then
+
This is the main function doing the majority of the citation
            Pages = Pages .. " " .. seterror('extra_pages');
+
formatting.
            At = '';
+
]]
        end
+
function citation0( config, args)
    end  
+
    --[[
 +
    Load Input Parameters
 +
    The argment_wrapper facillitates the mapping of multiple
 +
    aliases to single internal variable.
 +
    ]]
 +
    local A = argument_wrapper( args );
 +
 
 +
    local i
 +
    local PPrefix = A['PPrefix']
 +
    local PPPrefix = A['PPPrefix']
 +
     if is_set( A['NoPP'] ) then PPPrefix = "" PPrefix = "" end
 
      
 
      
     local Edition = A['Edition'];
+
     -- Pick out the relevant fields from the arguments.  Different citation templates
    local PublicationPlace = A['PublicationPlace']
+
     -- define different field names for the same underlying things.   
    local Place = A['Place'];
+
     local Authors = A['Authors'];
   
+
     local a = extractnames( args, 'AuthorList' );
    if not is_set(PublicationPlace) and is_set(Place) then
+
 
        PublicationPlace = Place;
+
     local Coauthors = A['Coauthors'];
    end
+
     local Others = A['Others'];
   
+
     local Editors = A['Editors'];
    if PublicationPlace == Place then Place = ''; end
+
     local e = extractnames( args, 'EditorList' );
      
 
     local PublisherName = A['PublisherName'];
 
     local RegistrationRequired = A['RegistrationRequired'];
 
    local SubscriptionRequired = A['SubscriptionRequired'];
 
    local Via = A['Via'];
 
     local AccessDate = A['AccessDate'];
 
     local ArchiveDate = A['ArchiveDate'];
 
     local Agency = A['Agency'];
 
     local DeadURL = A['DeadURL']
 
    local Language = A['Language'];
 
    local Format = A['Format'];
 
    local Ref = A['Ref'];
 
   
 
    local DoiBroken = A['DoiBroken'];
 
    local ID = A['ID'];
 
    local ASINTLD = A['ASINTLD'];
 
    local IgnoreISBN = A['IgnoreISBN'];
 
    local Embargo = A['Embargo'];
 
  
     local ID_list = extractids( args );
+
     local Year = A['Year'];
      
+
    local PublicationDate = A['PublicationDate'];
     local Quote = A['Quote'];
+
    local OrigYear = A['OrigYear'];
     local PostScript = A['PostScript'];
+
    local Date = A['Date'];
     local LayURL = A['LayURL'];
+
    local LayDate = A['LayDate'];
     local LaySource = A['LaySource'];
+
    ------------------------------------------------- Get title data
     local Transcript = A['Transcript'];
+
    local Title = A['Title'];
     local TranscriptURL = A['TranscriptURL']  
+
    local BookTitle = A['BookTitle'];
     local TranscriptURLorigin = A:ORIGIN('TranscriptURL');
+
     local Conference = A['Conference'];
     local sepc = A['Separator'];
+
     local TransTitle = A['TransTitle'];
     local LastAuthorAmp = A['LastAuthorAmp'];
+
     local TitleNote = A['TitleNote'];
     local no_tracking_cats = A['NoTracking'];
+
     local TitleLink = A['TitleLink'];
 
+
     local Chapter = A['Chapter'];
     local use_lowercase = ( sepc ~= '.' );
+
     local ChapterLink = A['ChapterLink'];
     local this_page = mw.title.getCurrentTitle(); --Also used for COinS and for language
+
     local TransChapter = A['TransChapter'];
   
+
     local TitleType = A['TitleType'];
    if not is_set(no_tracking_cats) then
+
     local Degree = A['Degree'];
        for k, v in pairs( cfg.uncategorized_namespaces ) do
+
     local Docket = A['Docket'];
            if this_page.nsText == v then
+
     local ArchiveURL = A['ArchiveURL'];
                no_tracking_cats = "true";
+
    local URL = A['URL']
                break;
+
     local URLorigin = A:ORIGIN('URL');
            end
+
    local ChapterURL = A['ChapterURL'];
        end
+
    local ChapterURLorigin = A:ORIGIN('ChapterURL');
    end
+
     local ConferenceURL = A['ConferenceURL'];
 +
    local ConferenceURLorigin = A:ORIGIN('ConferenceURL');
 +
    local Periodical = A['Periodical'];
 +
 
 +
--[[
 +
Parameter remapping for cite encyclopedia:
 +
When the citation has these parameters:
 +
|encyclopedia and |title then map |title to |article and |encyclopedia to |title
 +
|encyclopedia and |article then map |encyclopedia to |title
 +
|encyclopedia then map |encyclopedia to |title
 +
 
 +
|trans_title maps to |trans_chapter when |title is re-mapped
 +
 
 +
All other combinations of |encyclopedia, |title, and |article are not modified
 +
]]
 +
if ( config.CitationClass == "encyclopaedia" ) then
 +
if is_set(Periodical) then -- Periodical is set when |encyclopedia is set
 +
if is_set(Title) then
 +
if not is_set(Chapter) then
 +
Chapter = Title; -- |encyclopedia and |title are set so map |title to |article and |encyclopedia to |title
 +
TransChapter = TransTitle;
 +
Title = Periodical;
 +
Periodical = ''; -- redundant so unset
 +
TransTitle = ''; -- redundant so unset
 +
end
 +
else -- |title not set
 +
Title = Periodical; -- |encyclopedia set and |article set or not set so map |encyclopedia to |title
 +
Periodical = ''; -- redundant so unset
 +
end
 +
end
 +
end
  
     -- At this point fields may be nil if they weren't specified in the template use.  We can use that fact.
+
local Series = A['Series'];
 +
    local Volume = A['Volume'];
 +
    local Issue = A['Issue'];
 +
    local Position = '';
 +
     local Page, Pages, At, page_type;
 
      
 
      
     -- Account for the oddity that is {{cite conference}}, before generation of COinS data.
+
     Page = A['Page'];
    if is_set(BookTitle) then
+
    Pages = hyphentodash( A['Pages'] );
        Chapter = Title;
+
    At = A['At'];
        ChapterLink = TitleLink;
+
   
        TransChapter = TransTitle;
+
    if is_set(Page) then
        Title = BookTitle;
+
         if is_set(Pages) or is_set(At) then
        TitleLink = '';
+
            Page = Page .. " " .. seterror('extra_pages');
        TransTitle = '';
+
            Pages = '';
    end
+
            At = '';
    -- Account for the oddity that is {{cite episode}}, before generation of COinS data.
+
        end
    if config.CitationClass == "episode" then
+
    elseif is_set(Pages) then
        local AirDate = A['AirDate'];
+
         if is_set(At) then
        local SeriesLink = A['SeriesLink'];
+
            Pages = Pages .. " " .. seterror('extra_pages');
        local Season = A['Season'];
+
            At = '';
        local SeriesNumber = A['SeriesNumber'];
+
         end
        local Network = A['Network'];
+
     end  
         local Station = A['Station'];
 
        local s, n = {}, {};
 
        local Sep = (first_set(A["SeriesSeparator"], A["Separator"]) or "") .. " ";
 
       
 
        if is_set(Issue) then table.insert(s, cfg.messages["episode"] .. " " .. Issue); Issue = ''; end
 
        if is_set(Season) then table.insert(s, cfg.messages["season"] .. " " .. Season); end
 
         if is_set(SeriesNumber) then table.insert(s, cfg.messages["series"] .. " " .. SeriesNumber); end
 
        if is_set(Network) then table.insert(n, Network); end
 
        if is_set(Station) then table.insert(n, Station); end
 
       
 
        Date = Date or AirDate;
 
        Chapter = Title;
 
        ChapterLink = TitleLink;
 
        TransChapter = TransTitle;
 
        Title = Series;
 
        TitleLink = SeriesLink;
 
        TransTitle = '';
 
          
 
        Series = table.concat(s, Sep);
 
        ID = table.concat(n, Sep);
 
     end
 
 
      
 
      
     -- COinS metadata (see <http://ocoins.info/>) for
+
     local Edition = A['Edition'];
     -- automated parsing of citation information.
+
    local PublicationPlace = A['PublicationPlace']
     local OCinSoutput = COinS{
+
    local Place = A['Place'];
        ['Periodical'] = Periodical,
+
   
        ['Chapter'] = Chapter,
+
    if not is_set(PublicationPlace) and is_set(Place) then
        ['Title'] = Title,
+
        PublicationPlace = Place;
        ['PublicationPlace'] = PublicationPlace,
+
    end
        ['Date'] = first_set(Date, Year, PublicationDate),
+
   
        ['Series'] = Series,
+
    if PublicationPlace == Place then Place = ''; end
        ['Volume'] = Volume,
+
      
        ['Issue'] = Issue,
+
     local PublisherName = A['PublisherName'];
        ['Pages'] = first_set(Page, Pages, At),
+
    local RegistrationRequired = A['RegistrationRequired'];
        ['Edition'] = Edition,
+
    local SubscriptionRequired = A['SubscriptionRequired'];
        ['PublisherName'] = PublisherName,
+
    local Via = A['Via'];
        ['URL'] = first_set( URL, ChapterURL ),
+
    local AccessDate = A['AccessDate'];
        ['Authors'] = a,
+
    local ArchiveDate = A['ArchiveDate'];
        ['ID_list'] = ID_list,
+
    local Agency = A['Agency'];
        ['RawPage'] = this_page.prefixedText,
+
    local DeadURL = A['DeadURL']
     };
+
    local Language = A['Language'];
 +
    local Format = A['Format'];
 +
    local Ref = A['Ref'];
 +
   
 +
    local DoiBroken = A['DoiBroken'];
 +
 +
-- Special case for cite techreport.
 +
local ID = A['ID'];
 +
if (config.CitationClass == "techreport") then -- special case for cite techreport
 +
if is_set(Issue) then -- cite techreport uses 'number', which other citations aliase to 'issue'
 +
if not is_set(ID) then -- can we use ID for the "number"?
 +
ID = Issue; -- yes, use it
 +
Issue = ""; -- unset Issue so that "number" isn't duplicated in the rendered citation or COinS metadata
 +
else -- can't use ID so emit error message
 +
ID = ID .. " " .. seterror('redundant_parameters', '<code>&#124;id=</code> and <code>&#124;number=</code>');
 +
end
 +
end
 +
end
 +
 +
    local ASINTLD = A['ASINTLD'];
 +
    local IgnoreISBN = A['IgnoreISBN'];
 +
     local Embargo = A['Embargo'];
  
     if is_set(Periodical) and not is_set(Chapter) and is_set(Title) then
+
     local ID_list = extractids( args );
        Chapter = Title;
+
   
        ChapterLink = TitleLink;
+
    local Quote = A['Quote'];
        TransChapter = TransTitle;
+
    local PostScript = A['PostScript'];
        Title = '';
+
    local LayURL = A['LayURL'];
        TitleLink = '';
+
    local LaySource = A['LaySource'];
        TransTitle = '';
+
    local Transcript = A['Transcript'];
 +
    local TranscriptURL = A['TranscriptURL']
 +
    local TranscriptURLorigin = A:ORIGIN('TranscriptURL');
 +
    local sepc = A['Separator'];
 +
    local LastAuthorAmp = A['LastAuthorAmp'];
 +
    local no_tracking_cats = A['NoTracking'];
 +
 
 +
    local use_lowercase = ( sepc ~= '.' );
 +
    local this_page = mw.title.getCurrentTitle();  --Also used for COinS and for language
 +
   
 +
    if not is_set(no_tracking_cats) then
 +
        for k, v in pairs( cfg.uncategorized_namespaces ) do
 +
            if this_page.nsText == v then
 +
                no_tracking_cats = "true";
 +
                break;
 +
            end
 +
        end
 
     end
 
     end
  
    -- Now perform various field substitutions.
+
local anchor_year; -- used in the CITEREF identifier
    -- We also add leading spaces and surrounding markup and punctuation to the
+
local COinS_date; -- used in the COinS metadata
    -- various parts of the citation, but only when they are non-nil.
+
 
    if not is_set(Authors) then
+
-- legacy: promote concatenation of |day=, |month=, and |year= to Date if Date not set; or, promote PublicationDate to Date if neither Date nor Year are set.
        local Maximum = tonumber( A['DisplayAuthors'] );
+
if not is_set(Date) then
       
+
Date = Year; -- promote Year to Date
        -- Preserve old-style implicit et al.
+
Year = nil; -- make nil so Year as empty string isn't used for CITEREF
        if not is_set(Maximum) and #a == 9 then  
+
if is_set(Date) then
            Maximum = 8;
+
local Month = A['Month'];
            table.insert( z.message_tail, { seterror('implict_etal_author', {}, true ) } );
+
if is_set(Month) then
        elseif not is_set(Maximum) then
+
Date = Month .. " " .. Date;
            Maximum = #a + 1;
+
local Day = A['Day']
        end
+
if is_set(Day) then Date = Day .. " " .. Date end
           
+
end
        local control = {
+
elseif is_set(PublicationDate) then -- use PublicationDate when |date= and |year= are not set
            sep = A["AuthorSeparator"] .. " ",
+
Date = PublicationDate; -- promonte PublicationDate to Date
            namesep = (first_set(A["AuthorNameSeparator"], A["NameSeparator"]) or "") .. " ",
+
PublicationDate = ''; -- unset, no longer needed
            format = A["AuthorFormat"],
+
end
            maximum = Maximum,
+
end
            lastauthoramp = LastAuthorAmp
+
 
        };
+
if PublicationDate == Date then PublicationDate = ''; end -- if PublicationDate is same as Date, don't display in rendered citation
       
 
        -- If the coauthor field is also used, prevent ampersand and et al. formatting.
 
        if is_set(Coauthors) then
 
            control.lastauthoramp = nil;
 
            control.maximum = #a + 1;
 
        end
 
       
 
        Authors = listpeople(control, a)
 
    end
 
  
if not is_set(Authors) and is_set(Coauthors) then -- coauthors aren't displayed if one of authors=, authorn=, or lastn= isn't specified
+
-- Go test all of the date-holding parameters for valid MOS:DATE format and make sure that dates are real dates.
table.insert( z.message_tail, { seterror('coauthors_missing_author', {}, true) } ); -- emit error message
+
-- TODO: 2013-10-27: AirDate is nil when dates() is called because it hasn't been set yet.  Move the call to dates() or set AirDate earlier.
end
+
anchor_year, COinS_date = dates({['accessdate']=AccessDate, ['airdate']=AirDate, ['archivedate']=ArchiveDate, ['date']=Date, ['doi_brokendate']=DoiBroken,
 +
['embargo']=Embargo, ['laydate']=LayDate, ['publicationdate']=PublicationDate, ['year']=Year});
  
    local EditorCount
+
-- At this point fields may be nil if they weren't specified in the template use. We can use that fact.
    if not is_set(Editors) then
 
        local Maximum = tonumber( A['DisplayEditors'] );
 
        -- Preserve old-style implicit et al.
 
        if not is_set(Maximum) and #e == 4 then
 
            Maximum = 3;
 
            table.insert( z.message_tail, { seterror('implict_etal_editor', {}, true) } );
 
        elseif not is_set(Maximum) then
 
            Maximum = #e + 1;
 
        end
 
  
        local control = {
+
--Account for the oddity that is {{cite journal}} with |pmc= set and |url= not set
            sep = A["EditorSeparator"] .. " ",
+
if config.CitationClass == "journal" and not is_set(URL) and is_set(ID_list['PMC']) then
            namesep = (first_set(A["EditorNameSeparator"], A["NameSeparator"]) or "") .. " ",
+
if not is_embargoed(Embargo) then
            format = A['EditorFormat'],
+
URL=cfg.id_handlers['PMC'].prefix .. ID_list['PMC']; -- set url to be the same as the PMC external link if not embargoed
            maximum = Maximum,
+
URLorigin = cfg.id_handlers['PMC'].parameters[1]; -- set URLorigin to parameter name for use in error message if citation is missing a |title=
            lastauthoramp = LastAuthorAmp
+
end
        };
+
end
  
        Editors, EditorCount = listpeople(control, e);
+
    -- Account for the oddity that is {{cite conference}}, before generation of COinS data.
    else
+
    if is_set(BookTitle) then
         EditorCount = 1;
+
        Chapter = Title;
 +
        ChapterLink = TitleLink;
 +
        TransChapter = TransTitle;
 +
        Title = BookTitle;
 +
        TitleLink = '';
 +
         TransTitle = '';
 
     end
 
     end
 
+
     -- Account for the oddity that is {{cite episode}}, before generation of COinS data.
     local Cartography = "";
+
     if config.CitationClass == "episode" then
    local Scale = "";
+
         local AirDate = A['AirDate'];
     if config.CitationClass == "map" then
+
        local SeriesLink = A['SeriesLink'];
         if not is_set( Authors ) and is_set( PublisherName ) then
+
        local Season = A['Season'];
            Authors = PublisherName;
+
        local SeriesNumber = A['SeriesNumber'];
            PublisherName = "";
+
         local Network = A['Network'];
         end
+
         local Station = A['Station'];
         Cartography = A['Cartography'];
+
        local s, n = {}, {};
         if is_set( Cartography ) then
+
        local Sep = (first_set(A["SeriesSeparator"], A["Separator"]) or "") .. " ";
            Cartography = sepc .. " " .. wrap( 'cartography', Cartography, use_lowercase );
+
       
        end      
+
         if is_set(Issue) then table.insert(s, cfg.messages["episode"] .. " " .. Issue); Issue = ''; end
         Scale = A['Scale'];
+
         if is_set(Season) then table.insert(s, cfg.messages["season"] .. " " .. Season); end
         if is_set( Scale ) then
+
         if is_set(SeriesNumber) then table.insert(s, cfg.messages["series"] .. " " .. SeriesNumber); end
            Scale = sepc .. " " .. Scale;
+
        if is_set(Network) then table.insert(n, Network); end
         end      
+
         if is_set(Station) then table.insert(n, Station); end
 +
       
 +
        Date = Date or AirDate;
 +
        Chapter = Title;
 +
        ChapterLink = TitleLink;
 +
        TransChapter = TransTitle;
 +
        Title = Series;
 +
        TitleLink = SeriesLink;
 +
        TransTitle = '';
 +
       
 +
        Series = table.concat(s, Sep);
 +
        ID = table.concat(n, Sep);
 
     end
 
     end
 
      
 
      
     if not is_set(Date) then
+
     -- COinS metadata (see <http://ocoins.info/>) for
         Date = Year;
+
    -- automated parsing of citation information.
         if is_set(Date) then
+
    local OCinSoutput = COinS{
            local Month = A['Month'];
+
        ['Periodical'] = Periodical,
            if is_set(Month) then
+
        ['Chapter'] = Chapter,
                Date = Month .. " " .. Date;
+
        ['Title'] = Title,
                local Day = A['Day']
+
         ['PublicationPlace'] = PublicationPlace,
                if is_set(Day) then Date = Day .. " " .. Date end
+
         ['Date'] = first_set(COinS_date, Date), -- COinS_date has correctly formatted date if Date is valid; any reason to keep Date here?  Should we be including invalid dates in metadata?
            end
+
        ['Series'] = Series,
         end
+
        ['Volume'] = Volume,
     end
+
        ['Issue'] = Issue,
   
+
        ['Pages'] = first_set(Page, Pages, At),
     if inArray(PublicationDate, {Date, Year}) then PublicationDate = ''; end
+
        ['Edition'] = Edition,
    if not is_set(Date) and is_set(PublicationDate) then
+
        ['PublisherName'] = PublisherName,
         Date = PublicationDate;
+
        ['URL'] = first_set( URL, ChapterURL ),
         PublicationDate = '';
+
        ['Authors'] = a,
 +
        ['ID_list'] = ID_list,
 +
         ['RawPage'] = this_page.prefixedText,
 +
     };
 +
 
 +
     if is_set(Periodical) and not is_set(Chapter) and is_set(Title) then
 +
         Chapter = Title;
 +
        ChapterLink = TitleLink;
 +
        TransChapter = TransTitle;
 +
        Title = '';
 +
        TitleLink = '';
 +
         TransTitle = '';
 
     end
 
     end
  
     -- Captures the value for Date prior to adding parens or other textual transformations
+
     -- Now perform various field substitutions.
     local DateIn = Date;
+
     -- We also add leading spaces and surrounding markup and punctuation to the
      
+
     -- various parts of the citation, but only when they are non-nil.
     if not is_set(URL) and
+
     if not is_set(Authors) then
         not is_set(ChapterURL) and
+
         local Maximum = tonumber( A['DisplayAuthors'] );
        not is_set(ArchiveURL) and
 
        not is_set(ConferenceURL) and
 
        not is_set(TranscriptURL) then
 
 
          
 
          
         -- Test if cite web is called without giving a URL
+
         -- Preserve old-style implicit et al.
         if ( config.CitationClass == "web" ) then
+
         if not is_set(Maximum) and #a == 9 then  
             table.insert( z.message_tail, { seterror( 'cite_web_url', {}, true ) } );
+
            Maximum = 8;
 +
             table.insert( z.message_tail, { seterror('implict_etal_author', {}, true ) } );
 +
        elseif not is_set(Maximum) then
 +
            Maximum = #a + 1;
 
         end
 
         end
 +
           
 +
        local control = {
 +
            sep = A["AuthorSeparator"] .. " ",
 +
            namesep = (first_set(A["AuthorNameSeparator"], A["NameSeparator"]) or "") .. " ",
 +
            format = A["AuthorFormat"],
 +
            maximum = Maximum,
 +
            lastauthoramp = LastAuthorAmp
 +
        };
 
          
 
          
         -- Test if accessdate is given without giving a URL
+
         -- If the coauthor field is also used, prevent ampersand and et al. formatting.
         if is_set(AccessDate) then
+
         if is_set(Coauthors) then
             table.insert( z.message_tail, { seterror( 'accessdate_missing_url', {}, true ) } );
+
             control.lastauthoramp = nil;
             AccessDate = '';
+
             control.maximum = #a + 1;
 
         end
 
         end
 
          
 
          
         -- Test if format is given without giving a URL
+
         Authors = listpeople(control, a)  
        if is_set(Format) then
 
            Format = Format .. seterror( 'format_missing_url' );
 
        end
 
 
     end
 
     end
   
+
 
    -- Test if citation has no title
+
if not is_set(Authors) and is_set(Coauthors) then -- coauthors aren't displayed if one of authors=, authorn=, or lastn= isn't specified
    if not is_set(Chapter) and
+
table.insert( z.message_tail, { seterror('coauthors_missing_author', {}, true) } ); -- emit error message
        not is_set(Title) and
+
end
        not is_set(Periodical) and
+
 
        not is_set(Conference) and
+
     local EditorCount
        not is_set(TransTitle) and
+
     if not is_set(Editors) then
        not is_set(TransChapter) then
+
        local Maximum = tonumber( A['DisplayEditors'] );
        table.insert( z.message_tail, { seterror( 'citation_missing_title', {}, true ) } );
+
        -- Preserve old-style implicit et al.
    end
+
        if not is_set(Maximum) and #e == 4 then  
      
+
             Maximum = 3;
     Format = is_set(Format) and " (" .. Format .. ")" or "";
+
             table.insert( z.message_tail, { seterror('implict_etal_editor', {}, true) } );
   
+
        elseif not is_set(Maximum) then
    local OriginalURL = URL
+
            Maximum = #e + 1;
    DeadURL = DeadURL:lower();
 
    if is_set( ArchiveURL ) then
 
        if ( DeadURL ~= "no" ) then
 
             URL = ArchiveURL
 
             URLorigin = A:ORIGIN('ArchiveURL')
 
 
         end
 
         end
    end
+
 
   
+
        local control = {
    -- Format chapter / article title
+
            sep = A["EditorSeparator"] .. " ",
    if is_set(Chapter) and is_set(ChapterLink) then
+
            namesep = (first_set(A["EditorNameSeparator"], A["NameSeparator"]) or "") .. " ",
        Chapter = "[[" .. ChapterLink .. "|" .. Chapter .. "]]";
+
            format = A['EditorFormat'],
    end
+
            maximum = Maximum,
    if is_set(Periodical) and is_set(Title) then
+
            lastauthoramp = LastAuthorAmp
        Chapter = wrap( 'italic-title', Chapter );
+
        };
         TransChapter = wrap( 'trans-italic-title', TransChapter );
+
 
 +
         Editors, EditorCount = listpeople(control, e);
 
     else
 
     else
         Chapter = wrap( 'quoted-title', Chapter );
+
         EditorCount = 1;
        TransChapter = wrap( 'trans-quoted-title', TransChapter );
 
 
     end
 
     end
      
+
 
     local TransError = ""
+
     local Cartography = "";
     if is_set(TransChapter) then
+
     local Scale = "";
         if not is_set(Chapter) then
+
     if config.CitationClass == "map" then
             TransError = " " .. seterror( 'trans_missing_chapter' );
+
         if not is_set( Authors ) and is_set( PublisherName ) then
        else
+
             Authors = PublisherName;
             TransChapter = " " .. TransChapter;
+
             PublisherName = "";
 
         end
 
         end
     end
+
        Cartography = A['Cartography'];
 +
        if is_set( Cartography ) then
 +
            Cartography = sepc .. " " .. wrap( 'cartography', Cartography, use_lowercase );
 +
        end       
 +
        Scale = A['Scale'];
 +
        if is_set( Scale ) then
 +
            Scale = sepc .. " " .. Scale;
 +
        end       
 +
     end
 
      
 
      
    Chapter = Chapter .. TransChapter;
+
     if not is_set(URL) and
   
+
         not is_set(ChapterURL) and
     if is_set(Chapter) then
+
        not is_set(ArchiveURL) and
         if not is_set(ChapterLink) then
+
        not is_set(ConferenceURL) and
            if is_set(ChapterURL) then
+
        not is_set(TranscriptURL) then
                Chapter = externallink( ChapterURL, Chapter ) .. TransError;
+
       
                if not is_set(URL) then
+
        -- Test if cite web or cite podcast |url= is missing or empty
                    Chapter = Chapter .. Format;
+
if inArray(config.CitationClass, {"web","podcast"}) then
                    Format = "";
+
table.insert( z.message_tail, { seterror( 'cite_web_url', {}, true ) } );
                end
+
end
            elseif is_set(URL) then
+
          
                Chapter = externallink( URL, Chapter ) .. TransError .. Format;
+
        -- Test if accessdate is given without giving a URL
                URL = "";
+
        if is_set(AccessDate) then
                Format = "";
+
             table.insert( z.message_tail, { seterror( 'accessdate_missing_url', {}, true ) } );
            else
+
            AccessDate = '';
                Chapter = Chapter .. TransError;
+
         end
            end          
+
       
         elseif is_set(ChapterURL) then
+
        -- Test if format is given without giving a URL
             Chapter = Chapter .. " " .. externallink( ChapterURL, nil, ChapterURLorigin ) ..
+
        if is_set(Format) then
                TransError;
+
             Format = Format .. seterror( 'format_missing_url' );
         else
 
             Chapter = Chapter .. TransError;
 
 
         end
 
         end
        Chapter = Chapter .. sepc .. " " -- with end-space
+
     end
    elseif is_set(ChapterURL) then
 
        Chapter = " " .. externallink( ChapterURL, nil, ChapterURLorigin ) .. sepc .. " ";
 
     end      
 
 
      
 
      
     -- Format main title.
+
     -- Test if citation has no title
     if is_set(TitleLink) and is_set(Title) then
+
     if not is_set(Chapter) and
         Title = "[[" .. TitleLink .. "|" .. Title .. "]]"
+
        not is_set(Title) and
 +
        not is_set(Periodical) and
 +
        not is_set(Conference) and
 +
        not is_set(TransTitle) and
 +
        not is_set(TransChapter) then
 +
         table.insert( z.message_tail, { seterror( 'citation_missing_title', {}, true ) } );
 
     end
 
     end
 
      
 
      
     if is_set(Periodical) then
+
     Format = is_set(Format) and " (" .. Format .. ")" or "";
        Title = wrap( 'quoted-title', Title );
+
   
        TransTitle = wrap( 'trans-quoted-title', TransTitle );
+
    local OriginalURL = URL
     elseif inArray(config.CitationClass, {"web","news","pressrelease","conference"}) and
+
    DeadURL = DeadURL:lower();
            not is_set(Chapter) then
+
     if is_set( ArchiveURL ) then
         Title = wrap( 'quoted-title', Title );
+
         if ( DeadURL ~= "no" ) then
        TransTitle = wrap( 'trans-quoted-title', TransTitle );
+
            URL = ArchiveURL
    else
+
            URLorigin = A:ORIGIN('ArchiveURL')
        Title = wrap( 'italic-title', Title );
+
         end
         TransTitle = wrap( 'trans-italic-title', TransTitle );
 
 
     end
 
     end
 
      
 
      
     TransError = "";
+
     -- Format chapter / article title
     if is_set(TransTitle) then
+
    if is_set(Chapter) and is_set(ChapterLink) then
         if not is_set(Title) then
+
        Chapter = "[[" .. ChapterLink .. "|" .. Chapter .. "]]";
             TransError = " " .. seterror( 'trans_missing_title' );
+
    end
 +
    if is_set(Periodical) and is_set(Title) then
 +
        Chapter = wrap( 'italic-title', Chapter );
 +
        TransChapter = wrap( 'trans-italic-title', TransChapter );
 +
    else
 +
Chapter = kern_quotes (Chapter); -- if necessary, separate chapter title's leading and trailing quote marks from Module provided quote marks
 +
        Chapter = wrap( 'quoted-title', Chapter );
 +
        TransChapter = wrap( 'trans-quoted-title', TransChapter );
 +
    end
 +
   
 +
    local TransError = ""
 +
     if is_set(TransChapter) then
 +
         if not is_set(Chapter) then
 +
             TransError = " " .. seterror( 'trans_missing_chapter' );
 
         else
 
         else
             TransTitle = " " .. TransTitle;
+
             TransChapter = " " .. TransChapter;
 
         end
 
         end
 
     end
 
     end
 
      
 
      
     Title = Title .. TransTitle;
+
     Chapter = Chapter .. TransChapter;
 
      
 
      
     if is_set(Title) then
+
     if is_set(Chapter) then
         if not is_set(TitleLink) and is_set(URL) then  
+
         if not is_set(ChapterLink) then
             Title = externallink( URL, Title ) .. TransError .. Format      
+
            if is_set(ChapterURL) then
            URL = "";
+
                Chapter = externallink( ChapterURL, Chapter ) .. TransError;
             Format = "";
+
                if not is_set(URL) then
 +
                    Chapter = Chapter .. Format;
 +
                    Format = "";
 +
                end
 +
             elseif is_set(URL) then
 +
                Chapter = externallink( URL, Chapter ) .. TransError .. Format;
 +
                URL = "";
 +
                Format = "";
 +
            else
 +
                Chapter = Chapter .. TransError;
 +
             end           
 +
        elseif is_set(ChapterURL) then
 +
            Chapter = Chapter .. " " .. externallink( ChapterURL, nil, ChapterURLorigin ) ..
 +
                TransError;
 
         else
 
         else
             Title = Title .. TransError;
+
             Chapter = Chapter .. TransError;
 
         end
 
         end
     end
+
        Chapter = Chapter .. sepc .. " " -- with end-space
 +
    elseif is_set(ChapterURL) then
 +
        Chapter = " " .. externallink( ChapterURL, nil, ChapterURLorigin ) .. sepc .. " ";
 +
     end      
 
      
 
      
     if is_set(Place) then
+
    -- Format main title.
         Place = " " .. wrap( 'written', Place, use_lowercase ) .. sepc .. " ";
+
     if is_set(TitleLink) and is_set(Title) then
 +
         Title = "[[" .. TitleLink .. "|" .. Title .. "]]"
 
     end
 
     end
 
      
 
      
     if is_set(Conference) then
+
     if is_set(Periodical) then
        if is_set(ConferenceURL) then
+
Title = kern_quotes (Title); -- if necessary, separate title's leading and trailing quote marks from Module provided quote marks
            Conference = externallink( ConferenceURL, Conference );
+
        Title = wrap( 'quoted-title', Title );
         end
+
         TransTitle = wrap( 'trans-quoted-title', TransTitle );
        Conference = sepc .. " " .. Conference
+
    elseif inArray(config.CitationClass, {"web","news","pressrelease","conference","podcast"}) and
    elseif is_set(ConferenceURL) then
+
            not is_set(Chapter) then
         Conference = sepc .. " " .. externallink( ConferenceURL, nil, ConferenceURLorigin );
+
Title = kern_quotes (Title); -- if necessary, separate title's leading and trailing quote marks from Module provided quote marks
 +
         Title = wrap( 'quoted-title', Title );
 +
        TransTitle = wrap( 'trans-quoted-title', TransTitle );
 +
    else
 +
        Title = wrap( 'italic-title', Title );
 +
        TransTitle = wrap( 'trans-italic-title', TransTitle );
 
     end
 
     end
 
      
 
      
     if not is_set(Position) then
+
    TransError = "";
        local Minutes = A['Minutes'];
+
     if is_set(TransTitle) then
         if is_set(Minutes) then
+
         if not is_set(Title) then
             Position = " " .. Minutes .. " " .. cfg.messages['minutes'];
+
             TransError = " " .. seterror( 'trans_missing_title' );
 
         else
 
         else
             local Time = A['Time'];
+
             TransTitle = " " .. TransTitle;
            if is_set(Time) then
 
                local TimeCaption = A['TimeCaption']
 
                if not is_set(TimeCaption) then
 
                    TimeCaption = cfg.messages['event'];
 
                    if sepc ~= '.' then
 
                        TimeCaption = TimeCaption:lower();
 
                    end
 
                end
 
                Position = " " .. TimeCaption .. " " .. Time;
 
            end
 
 
         end
 
         end
    else
 
        Position = " " .. Position;
 
        At = '';
 
 
     end
 
     end
 
      
 
      
     if not is_set(Page) then
+
    Title = Title .. TransTitle;
         if is_set(Pages) then
+
   
            if is_set(Periodical) and
+
     if is_set(Title) then
                not inArray(config.CitationClass, {"encyclopaedia","web","book","news"}) then
+
         if not is_set(TitleLink) and is_set(URL) then  
                Pages = ": " .. Pages;
+
            Title = externallink( URL, Title ) .. TransError .. Format     
            elseif tonumber(Pages) ~= nil then
+
             URL = "";
                Pages = sepc .." " .. PPrefix .. Pages;
+
             Format = "";
             else
 
                Pages = sepc .." " .. PPPrefix .. Pages;
 
             end
 
        end
 
    else
 
        if is_set(Periodical) and
 
            not inArray(config.CitationClass, {"encyclopaedia","web","book","news"}) then
 
            Page = ": " .. Page;
 
 
         else
 
         else
             Page = sepc .." " .. PPrefix .. Page;
+
             Title = Title .. TransError;
 
         end
 
         end
 
     end
 
     end
 
      
 
      
     At = is_set(At) and (sepc .. " " .. At) or "";
+
     if is_set(Place) then
    Position = is_set(Position) and (sepc .. " " .. Position) or "";
+
        Place = " " .. wrap( 'written', Place, use_lowercase ) .. sepc .. " ";
     if config.CitationClass == 'map' then
+
    end
         local Section = A['Section'];
+
   
         local Inset = A['Inset'];
+
     if is_set(Conference) then
         if first_set( Pages, Page, At ) ~= nil or sepc ~= '.' then
+
         if is_set(ConferenceURL) then
            if is_set( Section ) then
+
            Conference = externallink( ConferenceURL, Conference );
                Section = ", " .. wrap( 'section', Section, true );
+
         end
            end
+
         Conference = sepc .. " " .. Conference
            if is_set( Inset ) then
+
    elseif is_set(ConferenceURL) then
                Inset = ", " .. wrap( 'inset', Inset, true );
+
        Conference = sepc .. " " .. externallink( ConferenceURL, nil, ConferenceURLorigin );
            end
+
    end
 +
   
 +
    if not is_set(Position) then
 +
        local Minutes = A['Minutes'];
 +
        if is_set(Minutes) then
 +
            Position = " " .. Minutes .. " " .. cfg.messages['minutes'];
 
         else
 
         else
             if is_set( Section ) then
+
            local Time = A['Time'];
                 Section = sepc .. " " .. wrap( 'section', Section, use_lowercase );
+
             if is_set(Time) then
                 if is_set( Inset ) then
+
                 local TimeCaption = A['TimeCaption']
                     Inset = ", " .. wrap( 'inset', Inset, true );
+
                 if not is_set(TimeCaption) then
 +
                     TimeCaption = cfg.messages['event'];
 +
                    if sepc ~= '.' then
 +
                        TimeCaption = TimeCaption:lower();
 +
                    end
 
                 end
 
                 end
            elseif is_set( Inset ) then
+
                 Position = " " .. TimeCaption .. " " .. Time;
                 Inset = sepc .. " " .. wrap( 'inset', Inset, use_lowercase );
+
             end
             end          
+
         end
         end          
+
    else
         At = At .. Section .. Inset;      
+
         Position = " " .. Position;
     end  
+
        At = '';
 
+
     end
--[[Look in the list of iso639-1 language codes to see if the value provided in the language parameter matches one of them.  If a match is found,
+
   
use that value; if not, then use the value that was provided with the language parameter.
+
    if not is_set(Page) then
+
        if is_set(Pages) then
Categories are assigned in a manner similar to the {{xx icon}} templates - categorizes only mainspace citations and only when the language code is not 'en' (English).
+
            if is_set(Periodical) and
]]
+
                not inArray(config.CitationClass, {"encyclopaedia","web","book","news","podcast"}) then
if is_set (Language) then
+
                Pages = ": " .. Pages;
local name = cfg.iso639_1[Language:lower()]; -- get the language name if Language parameter has a valid iso 639-1 code
+
            elseif tonumber(Pages) ~= nil then
if nil == name then
+
                Pages = sepc .." " .. PPrefix .. Pages;
Language=" " .. wrap( 'language', Language ); -- no match, use parameter's value
+
            else
else
+
                Pages = sepc .." " .. PPPrefix .. Pages;
if 0 == this_page.namespace and 'en' ~= Language:lower() then --found a match; is this page main / article space and English not the language?
+
            end
Language=" " .. wrap( 'language', name .. '[[Category:Articles with ' .. name .. '-language external links]]' ); -- in main space and not English: categorize
+
        end
else
+
     else
Language=" " .. wrap( 'language', name ); --not in mainspace or language is English so don't categorize
+
        if is_set(Periodical) and
end
+
            not inArray(config.CitationClass, {"encyclopaedia","web","book","news","podcast"}) then
end
+
            Page = ": " .. Page;
else
+
         else
Language=""; -- language not specified so make sure this is an empty string;
+
            Page = sepc .." " .. PPrefix .. Page;
end
 
 
 
    Others = is_set(Others) and (sepc .. " " .. Others) or "";
 
    TitleType = is_set(TitleType) and (" (" .. TitleType .. ")") or "";
 
    TitleNote = is_set(TitleNote) and (sepc .. " " .. TitleNote) or "";
 
    Edition = is_set(Edition) and (" " .. wrap( 'edition', Edition )) or "";
 
    Issue = is_set(Issue) and (" (" .. Issue .. ")") or "";
 
     Series = is_set(Series) and (sepc .. " " .. Series) or "";
 
    OrigYear = is_set(OrigYear) and (" [" .. OrigYear .. "]") or "";
 
    Agency = is_set(Agency) and (sepc .. " " .. Agency) or "";
 
   
 
    if is_set(Volume) then
 
         if ( mw.ustring.len(Volume) > 4 )
 
          then Volume = sepc .." " .. Volume;
 
          else Volume = " <b>" .. hyphentodash(Volume) .. "</b>";
 
 
         end
 
         end
 
     end
 
     end
 
      
 
      
     ------------------------------------ totally unrelated data
+
     At = is_set(At) and (sepc .. " " .. At) or "";
     --[[ Loosely mimic {{subscription required}} template; Via parameter identifies a delivery source that is not the publisher; these sources often, but not always, exist
+
    Position = is_set(Position) and (sepc .. " " .. Position) or "";
    behind a registration or paywall. So here, we've chosen to decouple via from subscription (via has never been part of the registration required template).
+
     if config.CitationClass == 'map' then
   
+
        local Section = A['Section'];
    Subscription implies paywall; Registration does not.  If both are used in a citation, the subscription required link note is displayed. There are no error messages for this condition.
+
        local Inset = A['Inset'];
    ]]
+
        if first_set( Pages, Page, At ) ~= nil or sepc ~= '.' then
    if is_set(Via) then
+
            if is_set( Section ) then
        Via = " " .. wrap( 'via', Via );
+
                Section = ", " .. wrap( 'section', Section, true );
    end
+
            end
 
+
            if is_set( Inset ) then
if is_set(SubscriptionRequired) then
+
                Inset = ", " .. wrap( 'inset', Inset, true );
        SubscriptionRequired = sepc .. " " .. cfg.messages['subscription']; --here when 'via' parameter not used but 'subscription' is
+
            end
    elseif is_set(RegistrationRequired) then
+
        else
        SubscriptionRequired = sepc .. " " .. cfg.messages['registration']; --here when 'via' and 'subscription' parameters not used but 'registration' is
+
            if is_set( Section ) then
     end
+
                Section = sepc .. " " .. wrap( 'section', Section, use_lowercase );
 +
                if is_set( Inset ) then
 +
                    Inset = ", " .. wrap( 'inset', Inset, true );
 +
                end
 +
            elseif is_set( Inset ) then
 +
                Inset = sepc .. " " .. wrap( 'inset', Inset, use_lowercase );
 +
            end           
 +
        end           
 +
        At = At .. Section .. Inset;      
 +
     end  
  
    if is_set(AccessDate) then
+
--[[Look in the list of iso639-1 language codes to see if the value provided in the language parameter matches one of them.  If a match is found,
        local retrv_text = " " .. cfg.messages['retrieved']
+
use that value; if not, then use the value that was provided with the language parameter.
        if (sepc ~= ".") then retrv_text = retrv_text:lower() end
+
        AccessDate = '<span class="reference-accessdate">' .. sepc
+
Categories are assigned in a manner similar to the {{xx icon}} templates - categorizes only mainspace citations and only when the language code is not 'en' (English).
            .. substitute( retrv_text, {AccessDate} ) .. '</span>'
+
]]
    end
+
if is_set (Language) then
   
+
-- local name = mw.language.fetchLanguageName( Language:lower(), "en" ); -- experiment: this seems to return correct ISO 639-1 language names
    if is_set(ID) then ID = sepc .." ".. ID; end
+
local name = cfg.iso639_1[Language:lower()]; -- get the language name if Language parameter has a valid iso 639-1 code
   
+
if nil == name then
    ID_list = buildidlist( ID_list, {DoiBroken = DoiBroken, ASINTLD = ASINTLD, IgnoreISBN = IgnoreISBN, Embargo=Embargo} );
+
Language=" " .. wrap( 'language', Language ); -- no match, use parameter's value
 +
else
 +
if 0 == this_page.namespace and 'en' ~= Language:lower() then --found a match; is this page main / article space and English not the language?
 +
Language=" " .. wrap( 'language', name .. '[[Category:Articles with ' .. name .. '-language external links]]' ); -- in main space and not English: categorize
 +
else
 +
Language=" " .. wrap( 'language', name ); --not in mainspace or language is English so don't categorize
 +
end
 +
end
 +
else
 +
Language=""; -- language not specified so make sure this is an empty string;
 +
end
 +
 
 +
Others = is_set(Others) and (sepc .. " " .. Others) or "";
  
    if is_set(URL) then
+
-- handle type parameter for those CS1 citations that have default values
        URL = " " .. externallink( URL, nil, URLorigin );
 
    end
 
  
    if is_set(Quote) then
+
if inArray(config.CitationClass, {"podcast","pressrelease","techreport","thesis"}) then
        if Quote:sub(1,1) == '"' and Quote:sub(-1,-1) == '"' then
+
TitleType = set_titletype (config.CitationClass, TitleType);
            Quote = Quote:sub(2,-2);
+
if is_set(Degree) and "Thesis" == TitleType then -- special case for cite thesis
 +
TitleType = Degree .. " thesis";
 +
end
 +
end
 +
 
 +
if is_set(TitleType) then -- if type parameter is specified
 +
TitleType = " (" .. TitleType .. ")"; -- display it in parentheses
 +
end
 +
 
 +
TitleNote = is_set(TitleNote) and (sepc .. " " .. TitleNote) or "";
 +
    Edition = is_set(Edition) and (" " .. wrap( 'edition', Edition )) or "";
 +
    Issue = is_set(Issue) and (" (" .. Issue .. ")") or "";
 +
    Series = is_set(Series) and (sepc .. " " .. Series) or "";
 +
    OrigYear = is_set(OrigYear) and (" [" .. OrigYear .. "]") or "";
 +
    Agency = is_set(Agency) and (sepc .. " " .. Agency) or "";
 +
   
 +
    if is_set(Volume) then
 +
        if ( mw.ustring.len(Volume) > 4 )
 +
          then Volume = sepc .." " .. Volume;
 +
          else Volume = " <b>" .. hyphentodash(Volume) .. "</b>";
 
         end
 
         end
        Quote = sepc .." " .. wrap( 'quoted-text', Quote );
 
        PostScript = "";
 
    elseif PostScript:lower() == "none" then
 
        PostScript = "";
 
 
     end
 
     end
 
      
 
      
     local Archived
+
     ------------------------------------ totally unrelated data
     if is_set(ArchiveURL) then
+
     --[[ Loosely mimic {{subscription required}} template; Via parameter identifies a delivery source that is not the publisher; these sources often, but not always, exist
        if not is_set(ArchiveDate) then
+
    behind a registration or paywall. So here, we've chosen to decouple via from subscription (via has never been part of the registration required template).
            ArchiveDate = seterror('archive_missing_date');
+
   
        end
+
    Subscription implies paywall; Registration does not. If both are used in a citation, the subscription required link note is displayed. There are no error messages for this condition.
        if "no" == DeadURL then
+
    ]]
            local arch_text = cfg.messages['archived'];
+
    if is_set(Via) then
            if sepc ~= "." then arch_text = arch_text:lower() end
+
        Via = " " .. wrap( 'via', Via );
            Archived = sepc .. " " .. substitute( cfg.messages['archived-not-dead'],
 
                { externallink( ArchiveURL, arch_text ), ArchiveDate } );
 
            if not is_set(OriginalURL) then
 
                Archived = Archived .. " " .. seterror('archive_missing_url');                             
 
            end
 
        elseif is_set(OriginalURL) then
 
            local arch_text = cfg.messages['archived-dead'];
 
            if sepc ~= "." then arch_text = arch_text:lower() end
 
            Archived = sepc .. " " .. substitute( arch_text,
 
                { externallink( OriginalURL, cfg.messages['original'] ), ArchiveDate } );
 
        else
 
            local arch_text = cfg.messages['archived-missing'];
 
            if sepc ~= "." then arch_text = arch_text:lower() end
 
            Archived = sepc .. " " .. substitute( arch_text,
 
                { seterror('archive_missing_url'), ArchiveDate } );
 
        end
 
    else
 
        Archived = ""
 
 
     end
 
     end
   
+
 
    local Lay
+
if is_set(SubscriptionRequired) then
    if is_set(LayURL) then
+
         SubscriptionRequired = sepc .. " " .. cfg.messages['subscription']; --here when 'via' parameter not used but 'subscription' is
         if is_set(LayDate) then LayDate = " (" .. LayDate .. ")" end
+
    elseif is_set(RegistrationRequired) then
        if is_set(LaySource) then
+
        SubscriptionRequired = sepc .. " " .. cfg.messages['registration']; --here when 'via' and 'subscription' parameters not used but 'registration' is
            LaySource = " &ndash; ''" .. safeforitalics(LaySource) .. "''";
+
    end
        else
+
 
            LaySource = "";
+
    if is_set(AccessDate) then
        end
+
         local retrv_text = " " .. cfg.messages['retrieved']
        if sepc == '.' then
+
        if (sepc ~= ".") then retrv_text = retrv_text:lower() end
            Lay = sepc .. " " .. externallink( LayURL, cfg.messages['lay summary'] ) .. LaySource .. LayDate
+
         AccessDate = '<span class="reference-accessdate">' .. sepc
         else
+
            .. substitute( retrv_text, {AccessDate} ) .. '</span>'
            Lay = sepc .. " " .. externallink( LayURL, cfg.messages['lay summary']:lower() ) .. LaySource .. LayDate
 
        end          
 
    else
 
         Lay = "";
 
 
     end
 
     end
 
      
 
      
     if is_set(Transcript) then
+
     if is_set(ID) then ID = sepc .." ".. ID; end
        if is_set(TranscriptURL) then Transcript = externallink( TranscriptURL, Transcript ); end
+
  if "thesis" == config.CitationClass and is_set(Docket) then
     elseif is_set(TranscriptURL) then
+
ID = sepc .." Docket ".. Docket .. ID;
         Transcript = externallink( TranscriptURL, nil, TranscriptURLorigin );
+
end
 +
 
 +
   
 +
    ID_list = buildidlist( ID_list, {DoiBroken = DoiBroken, ASINTLD = ASINTLD, IgnoreISBN = IgnoreISBN, Embargo=Embargo} );
 +
 
 +
    if is_set(URL) then
 +
        URL = " " .. externallink( URL, nil, URLorigin );
 +
    end
 +
 
 +
     if is_set(Quote) then
 +
         if Quote:sub(1,1) == '"' and Quote:sub(-1,-1) == '"' then
 +
            Quote = Quote:sub(2,-2);
 +
        end
 +
        Quote = sepc .." " .. wrap( 'quoted-text', Quote );
 +
        PostScript = "";
 +
    elseif PostScript:lower() == "none" then
 +
        PostScript = "";
 
     end
 
     end
 
      
 
      
     local Publisher;
+
     local Archived
     if is_set(Periodical) and
+
     if is_set(ArchiveURL) then
        not inArray(config.CitationClass, {"encyclopaedia","web","pressrelease"}) then
+
         if not is_set(ArchiveDate) then
         if is_set(PublisherName) then
+
             ArchiveDate = seterror('archive_missing_date');
             if is_set(PublicationPlace) then
 
                Publisher = PublicationPlace .. ": " .. PublisherName;
 
            else
 
                Publisher = PublisherName; 
 
            end
 
        elseif is_set(PublicationPlace) then
 
            Publisher= PublicationPlace;
 
        else
 
            Publisher = "";
 
 
         end
 
         end
         if is_set(PublicationDate) then
+
         if "no" == DeadURL then
             if is_set(Publisher) then
+
            local arch_text = cfg.messages['archived'];
                Publisher = Publisher .. ", " .. wrap( 'published', PublicationDate );
+
             if sepc ~= "." then arch_text = arch_text:lower() end
             else
+
            Archived = sepc .. " " .. substitute( cfg.messages['archived-not-dead'],
                 Publisher = PublicationDate;
+
                { externallink( ArchiveURL, arch_text ), ArchiveDate } );
 +
             if not is_set(OriginalURL) then
 +
                 Archived = Archived .. " " .. seterror('archive_missing_url');                              
 
             end
 
             end
 +
        elseif is_set(OriginalURL) then
 +
            local arch_text = cfg.messages['archived-dead'];
 +
            if sepc ~= "." then arch_text = arch_text:lower() end
 +
            Archived = sepc .. " " .. substitute( arch_text,
 +
                { externallink( OriginalURL, cfg.messages['original'] ), ArchiveDate } );
 +
        else
 +
            local arch_text = cfg.messages['archived-missing'];
 +
            if sepc ~= "." then arch_text = arch_text:lower() end
 +
            Archived = sepc .. " " .. substitute( arch_text,
 +
                { seterror('archive_missing_url'), ArchiveDate } );
 +
        end
 +
    else
 +
        Archived = ""
 +
    end
 +
   
 +
    local Lay
 +
    if is_set(LayURL) then
 +
        if is_set(LayDate) then LayDate = " (" .. LayDate .. ")" end
 +
        if is_set(LaySource) then
 +
            LaySource = " &ndash; ''" .. safeforitalics(LaySource) .. "''";
 +
        else
 +
            LaySource = "";
 
         end
 
         end
         if is_set(Publisher) then
+
         if sepc == '.' then
             Publisher = " (" .. Publisher .. ")";
+
             Lay = sepc .. " " .. externallink( LayURL, cfg.messages['lay summary'] ) .. LaySource .. LayDate
         end
+
        else
 +
            Lay = sepc .. " " .. externallink( LayURL, cfg.messages['lay summary']:lower() ) .. LaySource .. LayDate
 +
         end          
 
     else
 
     else
         if is_set(PublicationDate) then
+
        Lay = "";
             PublicationDate = " (" .. wrap( 'published', PublicationDate ) .. ")";
+
    end
         end
+
   
         if is_set(PublisherName) then
+
    if is_set(Transcript) then
             if is_set(PublicationPlace) then
+
        if is_set(TranscriptURL) then Transcript = externallink( TranscriptURL, Transcript ); end
                 Publisher = sepc .. " " .. PublicationPlace .. ": " .. PublisherName .. PublicationDate;
+
    elseif is_set(TranscriptURL) then
             else
+
        Transcript = externallink( TranscriptURL, nil, TranscriptURLorigin );
                 Publisher = sepc .. " " .. PublisherName .. PublicationDate;   
+
    end
             end             
+
   
         elseif is_set(PublicationPlace) then  
+
    local Publisher;
             Publisher= sepc .. " " .. PublicationPlace .. PublicationDate;
+
    if is_set(Periodical) and
         else  
+
        not inArray(config.CitationClass, {"encyclopaedia","web","pressrelease","podcast"}) then
             Publisher = PublicationDate;
+
        if is_set(PublisherName) then
         end
+
            if is_set(PublicationPlace) then
     end
+
                Publisher = PublicationPlace .. ": " .. PublisherName;
      
+
            else
     -- Several of the above rely upon detecting this as nil, so do it last.
+
                Publisher = PublisherName; 
     if is_set(Periodical) then
+
            end
         if is_set(Title) or is_set(TitleNote) then  
+
        elseif is_set(PublicationPlace) then
             Periodical = sepc .. " " .. wrap( 'italic-title', Periodical )  
+
            Publisher= PublicationPlace;
         else  
+
        else
             Periodical = wrap( 'italic-title', Periodical )
+
            Publisher = "";
         end
+
        end
     end
+
        if is_set(PublicationDate) then
 +
            if is_set(Publisher) then
 +
                Publisher = Publisher .. ", " .. wrap( 'published', PublicationDate );
 +
            else
 +
                Publisher = PublicationDate;
 +
            end
 +
        end
 +
        if is_set(Publisher) then
 +
            Publisher = " (" .. Publisher .. ")";
 +
        end
 +
    else
 +
         if is_set(PublicationDate) then
 +
             PublicationDate = " (" .. wrap( 'published', PublicationDate ) .. ")";
 +
         end
 +
         if is_set(PublisherName) then
 +
             if is_set(PublicationPlace) then
 +
                 Publisher = sepc .. " " .. PublicationPlace .. ": " .. PublisherName .. PublicationDate;
 +
             else
 +
                 Publisher = sepc .. " " .. PublisherName .. PublicationDate;   
 +
             end             
 +
         elseif is_set(PublicationPlace) then  
 +
             Publisher= sepc .. " " .. PublicationPlace .. PublicationDate;
 +
         else  
 +
             Publisher = PublicationDate;
 +
         end
 +
     end
 +
      
 +
     -- Several of the above rely upon detecting this as nil, so do it last.
 +
     if is_set(Periodical) then
 +
         if is_set(Title) or is_set(TitleNote) then  
 +
             Periodical = sepc .. " " .. wrap( 'italic-title', Periodical )  
 +
         else  
 +
             Periodical = wrap( 'italic-title', Periodical )
 +
         end
 +
     end
 +
 
 +
--[[
 +
Handle the oddity that is cite speech.  This code overrides whatever may be the value assigned to TitleNote (through |department=) and forces it to be " (Speech)" so that
 +
the annotation directly follows the |title= parameter value in the citation rather than the |event= parameter value (if provided).
 +
]]
 +
if "speech" == config.CitationClass then -- cite speech only
 +
TitleNote = " (Speech)"; -- annotate the citation
 +
if is_set (Periodical) then -- if Periodical, perhaps because of an included |website= or |journal= parameter
 +
if is_set (Conference) then -- and if |event= is set
 +
Conference = Conference .. sepc .. " "; -- then add appropriate punctuation to the end of the Conference variable before rendering
 +
end
 +
end
 +
end
  
 
     -- Piece all bits together at last.  Here, all should be non-nil.
 
     -- Piece all bits together at last.  Here, all should be non-nil.
Line 1,649: Line 2,017:
  
 
     -- Now enclose the whole thing in a <span/> element
 
     -- Now enclose the whole thing in a <span/> element
    if not is_set(Year) then
 
        if is_set(DateIn) then
 
            Year = selectyear( DateIn );
 
        elseif is_set(PublicationDate) then
 
            Year = selectyear( PublicationDate );
 
        end
 
    end
 
   
 
 
     local options = {};
 
     local options = {};
 
      
 
      
Line 1,680: Line 2,040:
 
                 end
 
                 end
 
             end
 
             end
            names[ #names + 1 ] = Year;
+
names[ #names + 1 ] = first_set(Year, anchor_year); -- Year first for legacy citations
 
             id = anchorid(names)
 
             id = anchorid(names)
 
         end
 
         end

Latest revision as of 04:35, 25 April 2014

local z = {

   error_categories = {};
   error_ids = {};
   message_tail = {};

}

-- Include translation message hooks, ID and error handling configuration settings. local cfg = mw.loadData( 'Module:Citation/CS1/Configuration' );

-- Contains a list of all recognized parameters local whitelist = mw.loadData( 'Module:Citation/CS1/Whitelist' );

-- Whether variable is set or not function is_set( var )

   return not (var == nil or var == );

end

-- First set variable or nil if none function first_set(...)

   local list = {...};
   for _, var in pairs(list) do
       if is_set( var ) then
           return var;
       end
   end

end

-- Whether needle is in haystack function inArray( needle, haystack )

   if needle == nil then
       return false;
   end
   for n,v in ipairs( haystack ) do
       if v == needle then
           return n;
       end
   end
   return false;

end

--[[ Categorize and emit an error message when the citation contains one or more deprecated parameters. Because deprecated parameters (currently |day=, |month=, |coauthor=, and |coauthors=) aren't related to each other and because these parameters may be concatenated into the variables used by |date= and |author#= (and aliases) details of which parameter caused the error message are not provided. Only one error message is emitted regarless of the number of deprecated parameters in the citation. ]] function deprecated_parameter() if true ~= Page_in_deprecated_cat then -- if we haven't been here before then set a Page_in_deprecated_cat=true; -- sticky flag so that if there are more than one deprecated parameter the category is added only once table.insert( z.message_tail, { seterror( 'deprecated_params', {error_message}, true ) } ); -- add error message end end

-- Populates numbered arguments in a message string using an argument table. function substitute( msg, args ) -- return args and tostring( mw.message.newRawMessage( msg, args ) ) or msg; return args and mw.message.newRawMessage( msg, args ):plain() or msg; end

--[[ Apply kerning to open the space between the quote mark provided by the Module and a leading or trailing quote mark contained in a |title= or |chapter= parameter's value. This function will positive kern either single or double quotes: "'Unkerned title with leading and trailing single quote marks'" " 'Kerned title with leading and trailing single quote marks' " (in real life the kerning isn't as wide as this example) ]] function kern_quotes (str) local left='%1'; -- spacing to use when title contains leading single or double quote mark local right='%1'; -- spacing to use when title contains trailing single or double quote mark

if str:match ("^[\"\'][^\']") then str = string.gsub( str, "^[\"\']", left, 1 ); -- replace (captured) leading single or double quote with left-side end if str:match ("[^\'][\"\']$") then str = string.gsub( str, "[\"\']$", right, 1 ); -- replace (captured) trailing single or double quote with right-side end return str; end

-- Wraps a string using a message_list configuration taking one argument function wrap( key, str, lower )

   if not is_set( str ) then
       return "";
   elseif inArray( key, { 'italic-title', 'trans-italic-title' } ) then
       str = safeforitalics( str );
   end
   if lower == true then
       return substitute( cfg.messages[key]:lower(), {str} );
   else
       return substitute( cfg.messages[key], {str} );
   end        

end

--[[ Argument wrapper. This function provides support for argument mapping defined in the configuration file so that multiple names can be transparently aliased to single internal variable. ]] function argument_wrapper( args )

   local origin = {};
   
   return setmetatable({
       ORIGIN = function( self, k )
           local dummy = self[k]; --force the variable to be loaded.
           return origin[k];
       end
   },
   {
       __index = function ( tbl, k )
           if origin[k] ~= nil then
               return nil;
           end
           
           local args, list, v = args, cfg.aliases[k];
           
           if type( list ) == 'table' then
               v, origin[k] = selectone( args, list, 'redundant_parameters' );
               if origin[k] == nil then
                   origin[k] = ; -- Empty string, not nil
               end
           elseif list ~= nil then
               v, origin[k] = args[list], list;
           else
               -- maybe let through instead of raising an error?
               -- v, origin[k] = args[k], k;
               error( cfg.messages['unknown_argument_map'] );
           end
           
           -- Empty strings, not nil;
           if v == nil then
               v = cfg.defaults[k] or ;
               origin[k] = ;
           end
           
           tbl = rawset( tbl, k, v );
           return v;
       end,
   });

end

--[[ Looks for a parameter's name in the whitelist.

Parameters in the whitelist can have three values: true - active, supported parameters false - deprecated, supported parameters nil - unsupported parameters ]] function validate( name ) local name = tostring( name ); local state = whitelist.basic_arguments[ name ];

-- Normal arguments if true == state then return true; end -- valid actively supported parameter if false == state then deprecated_parameter (); -- parameter is deprecated but still supported return true; end

-- Arguments with numbers in them name = name:gsub( "%d+", "#" ); -- replace digit(s) with # (last25 becomes last# state = whitelist.numbered_arguments[ name ]; if true == state then return true; end -- valid actively supported parameter if false == state then deprecated_parameter (); -- parameter is deprecated but still supported return true; end

return false; -- Not supported because not found or name is set to nil end

-- Formats a comment for error trapping function errorcomment( content, hidden )

   return wrap( hidden and 'hidden-error' or 'visible-error', content );

end

--[[ Sets an error condition and returns the appropriate error message. The actual placement of the error message in the output is the responsibility of the calling function. ]] function seterror( error_id, arguments, raw, prefix, suffix )

   local error_state = cfg.error_conditions[ error_id ];
   
   prefix = prefix or "";
   suffix = suffix or "";
   
   if error_state == nil then
       error( cfg.messages['undefined_error'] );
   elseif is_set( error_state.category ) then
       table.insert( z.error_categories, error_state.category );
   end
   
   local message = substitute( error_state.message, arguments );
   
   message = message .. " ([[" .. cfg.messages['help page link'] .. 
       "#" .. error_state.anchor .. "|" ..
       cfg.messages['help page label'] .. "]])";
   
   z.error_ids[ error_id ] = true;
   if inArray( error_id, { 'bare_url_missing_title', 'trans_missing_title' } )
           and z.error_ids['citation_missing_title'] then
       return , false;
   end
   
   message = table.concat({ prefix, message, suffix });
   
   if raw == true then
       return message, error_state.hidden;
   end        
       
   return errorcomment( message, error_state.hidden );

end

-- Formats a wiki style external link function externallinkid(options)

   local url_string = options.id;
   if options.encode == true or options.encode == nil then
       url_string = mw.uri.encode( url_string );
   end
   return mw.ustring.format( '%s%s[%s%s%s %s]',
       options.link, options.label, options.separator or " ",
       options.prefix, url_string, options.suffix or "",
       mw.text.nowiki(options.id)
   );

end

-- Formats a wiki style internal link function internallinkid(options)

   return mw.ustring.format( '%s%s%s',
       options.link, options.label, options.separator or " ",
       options.prefix, options.id, options.suffix or "",
       mw.text.nowiki(options.id)
   );

end

-- Format an external link with error checking function externallink( URL, label, source )

   local error_str = "";
   if not is_set( label ) then
       label = URL;
       if is_set( source ) then
           error_str = seterror( 'bare_url_missing_title', { wrap( 'parameter', source ) }, false, " " );
       else
           error( cfg.messages["bare_url_no_origin"] );
       end            
   end
   if not checkurl( URL ) then
       error_str = seterror( 'bad_url', {}, false, " " ) .. error_str;
   end
   return table.concat({ "[", URL, " ", safeforurl( label ), "]", error_str });

end

-- Formats a link to Amazon function amazon(id, domain)

   if not is_set(domain) then 
       domain = "com"
   elseif ( "jp" == domain or "uk" == domain ) then
       domain = "co." .. domain
   end
   local handler = cfg.id_handlers['ASIN'];
   return externallinkid({link = handler.link,
       label=handler.label , prefix="//www.amazon."..domain.."/dp/",id=id,
       encode=handler.encode, separator = handler.separator})

end

--[[ Format PMID and do simple error checking. PMIDs are sequential numbers beginning at 1 and counting up. This code checks the PMID to see that it contains only digits and is less than test_limit; the value in local variable test_limit will need to be updated periodically as more PMIDs are issued. ]] function pmid(id) local test_limit = 30000000; -- update this value as PMIDs approach local handler = cfg.id_handlers['PMID']; local err_cat = ; -- presume that PMID is valid

if id:match("[^%d]") then -- if PMID has anything but digits err_cat = ' ' .. seterror( 'bad_pmid' ); -- set an error message else -- PMID is only digits local id_num = tonumber(id); -- convert id to a number for range testing if 1 > id_num or test_limit < id_num then -- if PMID is outside test limit boundaries err_cat = ' ' .. seterror( 'bad_pmid' ); -- set an error message end end

return externallinkid({link = handler.link, label = handler.label, prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) .. err_cat; end

--[[ Determines if a PMC identifier's online version is embargoed. Compares the date in |embargo= against today's date. If embargo date is in the future, returns true; otherwse, returns false because the embargo has expired or |embargo= not set in this cite. ]] function is_embargoed(embargo) if is_set(embargo) then local lang = mw.getContentLanguage(); local good1, embargo_date, good2, todays_date; good1, embargo_date = pcall( lang.formatDate, lang, 'U', embargo ); good2, todays_date = pcall( lang.formatDate, lang, 'U' );

if good1 and good2 and tonumber( embargo_date ) >= tonumber( todays_date ) then --is embargo date is in the future? return true; -- still embargoed end end return false; -- embargo expired or |embargo= not set end

--[[ Formats a PMC and checks for embargoed articles. The embargo parameter takes a date for a value. If the embargo date is in the future the PMC identifier will not be linked to the article. If the embargo specifies a date in the past, or if it is empty or omitted, then the PMC identifier is linked to the article through the link at cfg.id_handlers['PMC'].prefix. ]] function pmc(id, embargo) local handler = cfg.id_handlers['PMC'];

local text;

if is_embargoed(embargo) then text="" .. handler.label .. ":" .. handler.separator .. id; --still embargoed so no external link else text = externallinkid({link = handler.link, label = handler.label, --no embargo date, ok to link to article prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) end return text; end

-- Formats a DOI and checks for DOI errors. function doi(id, inactive)

   local cat = ""
   local handler = cfg.id_handlers['DOI'];
   
   local text;

if is_set(inactive) then local inactive_year = inactive:match("%d%d%d%d") or ; -- try to get the year portion from the inactive date text = "" .. handler.label .. ":" .. id; if is_set(inactive_year) then table.insert( z.error_categories, "Pages with DOIs inactive since " .. inactive_year ); else table.insert( z.error_categories, "Pages with inactive DOIs" ); -- when inactive doesn't contain a recognizable year end inactive = " (" .. cfg.messages['inactive'] .. " " .. inactive .. ")" else text = externallinkid({link = handler.link, label = handler.label, prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) inactive = "" end

if nil == id:match("^10%.[^%s–]-[^%.,]$") then -- doi must begin with '10.', must not contain spaces or endashes, and must not end with period or comma cat = ' ' .. seterror( 'bad_doi' ); end return text .. inactive .. cat end

-- Formats an OpenLibrary link, and checks for associated errors. function openlibrary(id)

   local code = id:sub(-1,-1)
   local handler = cfg.id_handlers['OL'];
   if ( code == "A" ) then
       return externallinkid({link=handler.link, label=handler.label,
           prefix="http://openlibrary.org/authors/OL",id=id, separator=handler.separator,
           encode = handler.encode})
   elseif ( code == "M" ) then
       return externallinkid({link=handler.link, label=handler.label,
           prefix="http://openlibrary.org/books/OL",id=id, separator=handler.separator,
           encode = handler.encode})
   elseif ( code == "W" ) then
       return externallinkid({link=handler.link, label=handler.label,
           prefix= "http://openlibrary.org/works/OL",id=id, separator=handler.separator,
           encode = handler.encode})
   else
       return externallinkid({link=handler.link, label=handler.label,
           prefix= "http://openlibrary.org/OL",id=id, separator=handler.separator,
           encode = handler.encode}) .. 
           ' ' .. seterror( 'bad_ol' );
   end

end

--[[ Validate and format an issn. This code fixes the case where an editor has included an ISSN in the citation but has separated the two groups of four digits with a space. When that condition occurred, the resulting link looked like this:

|issn=0819 4327 gives: 4327 0819 4327 -- can't have spaces in an external link

This code now prevents that by inserting a hyphen at the issn midpoint. It also validates the issn for length and makes sure that the checkdigit agrees with the calculated value. Incorrect length (8 digits), characters other than 0-9 and X, or checkdigit / calculated value mismatch will all cause a check issn error message. The issn is always displayed with a hyphen, even if the issn was given as a single group of 8 digits. ]] function issn(id) local issn_copy = id; -- save a copy of unadulterated issn; use this version for display if issn does not validate local handler = cfg.id_handlers['ISSN']; local text; local valid_issn = true;

id=id:gsub( "[%s-–]", "" ); -- strip spaces, hyphens, and ndashes from the issn

if 8 ~= id:len() or nil == id:match( "^%d*X?$" ) then -- validate the issn: 8 didgits long, containing only 0-9 or X in the last position valid_issn=false; -- wrong length or improper character else valid_issn=is_valid_isxn(id, 8); -- validate issn end

if true == valid_issn then id = string.sub( id, 1, 4 ) .. "-" .. string.sub( id, 5 ); -- if valid, display correctly formatted version else id = issn_copy; -- if not valid, use the show the invalid issn with error message end

text = externallinkid({link = handler.link, label = handler.label, prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})

if false == valid_issn then text = text .. ' ' .. seterror( 'bad_issn' ) -- add an error message if the issn is invalid end

return text end

--[[ This function sets default title types (equivalent to the citation including |type=<default value>) for those citations that have defaults. Also handles the special case where it is desireable to omit the title type from the rendered citation (|type=none). ]] function set_titletype(cite_class, title_type) if is_set(title_type) then if "none" == title_type then title_type = ""; -- if |type=none then type parameter not displayed end return title_type; -- if |type= has been set to any other value use that value end

if "podcast" == cite_class then -- if this citation is cite podcast return "Podcast"; -- display podcast annotation

elseif "pressrelease" == cite_class then -- if this citation is cite press release return "Press release"; -- display press release annotation

elseif "techreport" == cite_class then -- if this citation is cite techreport return "Technical report"; -- display techreport annotation

elseif "thesis" == cite_class then -- if this citation is cite thesis (degree option handled after this function returns) return "Thesis"; -- display simple thesis annotation (without |degree= modification) end end

-- 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 function get_month_number (month) local long_months = {['January']=1, ['February']=2, ['March']=3, ['April']=4, ['May']=5, ['June']=6, ['July']=7, ['August']=8, ['September']=9, ['October']=10, ['November']=11, ['December']=12}; local short_months = {['Jan']=1, ['Feb']=2, ['Mar']=3, ['Apr']=4, ['May']=5, ['Jun']=6, ['Jul']=7, ['Aug']=8, ['Sep']=9, ['Oct']=10, ['Nov']=11, ['Dec']=12}; local temp; temp=long_months[month]; if temp then return temp; end -- if month is the long-form name temp=short_months[month]; if temp then return temp; end -- if month is the short-form name return 0; -- misspelled, improper case, or not a month name end

-- returns a number according to the sequence of seasons in a year: 1 for Winter, etc. Capitalization and spelling must be correct. If not a valid season, returns 0 function get_season_number (season) local season_list = {['Winter']=1, ['Spring']=2, ['Summer']=3, ['Fall']=4, ['Autumn']=4} local temp; temp=season_list[season]; if temp then return temp; end -- if season is a valid name return its number return 0; -- misspelled, improper case, or not a season name end

--[[ Returns true if day is less than or equal to the number of days in month; 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. ]] function is_valid_date (year, month, day) local days_in_month = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; local month_length; if (2==month) then -- if February month_length = 28; -- then 28 days unless if 1582 > tonumber(year) then -- Julian calendar if 0==(year%4) then month_length = 29; end else -- Gregorian calendar if (0==(year%4) and (0~=(year%100) or 0==(year%400))) then -- is a leap year? month_length = 29; -- if leap year then 29 days in February end end else month_length=days_in_month[month]; end

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

--[[ 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. Similarly, seasons are also left to right, earliest to latest in time. There is an oddity with seasons. Winter is assigned a value of 1, spring 2, ..., fall and autumn 4. Because winter can follow fall/autumn at the end of a calender year, a special test is made to see if |date=Fall-Winter yyyy (4-1) is the date. ]]

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

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

if 0 ~= range_start_number then -- is start of range a season? if range_start_number < range_end_number then -- range_start is a season return true; -- return true when range_end is also a season and follows start season; else false end if 4 == range_start_number and 1 == range_end_number then -- special case when range is Fall-Winter or Autumn-Winter return true; end end return false; -- range_start is not a month or a season; or range_start is a season and range_end is not; or improper season sequence end

local range_end_number = get_month_number (range_end); -- get end month number if range_start_number < range_end_number then -- range_start is a month; does range_start precede range_end? return true; -- if yes, return true end return false; -- range_start month number is greater than or equal to range end number; or range end isn't a month end

--[[ Check date format to see that it is one of the formats approved by MOS:DATE: MMMM D, YYYY; D MMMM YYYY; MMMM YYYY; YYYY-MM-DD; YYYY. 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.

If the date fails the fomat tests, this function returns false but 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 its year from the year parameter if present.

Inputs: date_string - date string from date-holding parameters (date, year, accessdate, embargo, archivedate, etc)

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 date_string without anchor_year disambiguator if any ]] function check_date (date_string) local year; local month=0; -- assume that month and day are not used; if either is zero then final year/month/day validation is not necessary local day=0; local day2=0; -- second day in a day range local anchor_year; local coins_date;

if date_string:match("^%d%d%d%d%-%d%d%-%d%d$") then -- Year-initial numerical year month day format year, month, day=string.match(date_string, "(%d%d%d%d)%-(%d%d)%-(%d%d)"); month=tonumber(month); if 12 < month or 1 > month or 1583 > tonumber(year) then return false; end -- month number not valid or not Gregorian calendar anchor_year = year;

elseif date_string:match("^%a+ +[1-9]%d?, +[1-9]%d%d%d%a?$") then -- month-initial: month day, year month, day, anchor_year, year=string.match(date_string, "(%a+)%s*(%d%d?),%s*((%d%d%d%d)%a?)"); 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 date_string:match("^%a+ +[1-9]%d?–[1-9]%d?, +[1-9]%d%d%d%a?$") then -- month-initial day range: month day–day, year; days are separated by endash month, day, day2, anchor_year, year=string.match(date_string, "(%a+) +(%d%d?)–(%d%d?), +((%d%d%d%d)%a?)"); if tonumber(day) >= tonumber(day2) then return false; end -- date range order is left to right: earlier to later; dates may not be the same; month = get_month_number (month); if 0 == month then return false; end -- return false if month text isn't one of the twelve months

elseif date_string:match("^[1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day-initial: day month year day, month, anchor_year, year=string.match(date_string, "(%d%d*)%s*(%a+)%s*((%d%d%d%d)%a?)"); 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 date_string:match("^[1-9]%d?–[1-9]%d? +%a+ +[1-9]%d%d%d%a?$") then -- day-range-initial: day–day month year; days are separated by endash day, day2, month, anchor_year, year=string.match(date_string, "(%d%d?)–(%d%d?) +(%a+) +((%d%d%d%d)%a?)"); if tonumber(day) >= tonumber(day2) then return false; end -- date range order is left to right: earlier to later; dates may not be the same; month = get_month_number (month); if 0 == month then return false; end -- return false if month text isn't one of the twelve months

elseif mw.ustring.match (date_string, "^%a+–%a+ +[1-9]%d%d%d%a?$") then -- month/season range year; months separated by endash local month2 month, month2, anchor_year, year=mw.ustring.match (date_string, "(%a+)[%-/–](%a+)%s*((%d%d%d%d)%a?)"); if false == is_valid_month_season_range(month, month2) then return false; end

elseif date_string:match("^%a+ +%d%d%d%d%a?$") then -- month/season year month, anchor_year, year=string.match(date_string, "(%a+)%s*((%d%d%d%d)%a?)"); if 0 == get_month_number (month) then -- if month text isn't one of the twelve months, might be a season if 0 == get_season_number (month) then -- not a month, is it a season? return false; -- return false not a month or one of the five seasons end end

elseif date_string:match("^[1-9]%d%d%d?%a?$") then -- year; here accept either YYY or YYYY anchor_year, year=string.match(date_string, "((%d%d%d%d?)%a?)");

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

if 0~=month and 0~=day then -- check year month day dates for validity if 0~=day2 then -- If there is a second day (d–d Mmm YYYY or Mmm d–d, YYYY) test the second date if false==is_valid_date(year,month,day2) then return false; -- second date in date range string is not a real date return false; unset anchor_year and coins_date end -- if second date range string is valid, fall through to test the first date range end if false==is_valid_date(year,month,day) then return false; -- date string is not a real date return false; unset anchor_year and coins_date end end

coins_date= mw.ustring.gsub( date_string, "–", "-" ); -- if here, then date_string is valid; set coins_date and replace any ndash with a hyphen

return true, anchor_year, coins_date; -- format is good and date string represents a real date end

--[[ 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 and values for anchor_year (used in CITEREF identifiers) and COinS_date (used in the COinS metadata). The |date= parameter test is unique. This function only accepts anchor_year and COinS_date results from the |date= parameter test and |date= 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, a single error message is created as the dates are tested. ]]

function dates(date_parameters_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 error_message =""; local good_date=false;

for k, v in pairs(date_parameters_list) do -- for each date-holding parameter in the list if is_set(v) then -- if the parameter has a value if v:match("^c%. [1-9]%d%d%d?%a?$") then -- special case for c. year or with or without CITEREF disambiguator - only |date= and |year= if 'date'==k then good_date, anchor_year, COinS_date = true, v:match("((c%. [1-9]d%d%d?)%a?)"); -- anchor year and COinS_date only from |date= parameter elseif 'year'==k then good_date = true; end elseif 'year'==k then -- if the parameter is |year= (but not c. year) if v:match("^[1-9]%d%d%d?%a?$") then -- year with or without CITEREF disambiguator good_date = true; end elseif 'date'==k then -- if the parameter is |date= if v:match("n%.d%.%a?") then -- if |date=n.d. with or without a CITEREF disambiguator good_date, anchor_year, COinS_date = true, v:match("((n%.d%.)%a?)"); --"n.d."; no error when date parameter is set to no date elseif v:match("nd%a?$") then -- if |date=nd with or without a CITEREF disambiguator good_date, anchor_year, COinS_date = true, v:match("((nd)%a?)"); --"nd"; no error when date parameter is set to no date else good_date, anchor_year, COinS_date = check_date (v); -- go test the date end else -- any other date-holding parameter good_date = check_date (v); -- go test the date end if false==good_date then -- assemble one error message so we don't add the tracking category multiple times if is_set(error_message) then -- once we've added the first portion of the error message ... error_message=error_message .. ", "; -- ... add a comma space separator end error_message=error_message .. "|" .. k .. "="; -- add the failed parameter end end end if is_set(error_message) then table.insert( z.message_tail, { seterror( 'bad_date', {error_message}, true ) } ); -- add this error message end

return anchor_year, COinS_date; -- and done end

--[[ Determines whether a URL string is valid

At present the only check is whether the string appears to be prefixed with a URI scheme. It is not determined whether the URI scheme is valid or whether the URL is otherwise well formed. ]] function checkurl( url_str )

   -- Protocol-relative or URL scheme
   return url_str:sub(1,2) == "//" or url_str:match( "^[^/]*:" ) ~= nil;

end

-- Removes irrelevant text and dashes from ISBN number -- Similar to that used for Special:BookSources function cleanisbn( isbn_str )

   return isbn_str:gsub( "[^-0-9X]", "" );

end

--[[ ISBN-10 and ISSN validator code calculates checksum across all isbn/issn digits including the check digit. ISBN-13 is checked in checkisbn(). If the number is valid the result will be 0. Before calling this function, issbn/issn must be checked for length and stripped of dashes, spaces and other non-isxn characters. ]] function is_valid_isxn (isxn_str, len) local temp = 0; isxn_str = { isxn_str:byte(1, len) }; -- make a table of bytes len = len+1; -- adjust to be a loop counter for i, v in ipairs( isxn_str ) do -- loop through all of the bytes and calculate the checksum if v == string.byte( "X" ) then -- if checkdigit is X temp = temp + 10*( len - i ); -- it represents 10 decimal else temp = temp + tonumber( string.char(v) )*(len-i); end end return temp % 11 == 0; -- returns true if calculation result is zero end

-- Determines whether an ISBN string is valid function checkisbn( isbn_str ) if nil ~= isbn_str:match("[^%s-0-9X]") then return false; end -- fail if isbn_str contains anything but digits, hyphens, or the uppercase X isbn_str = isbn_str:gsub( "-", "" ):gsub( " ", "" ); -- remove hyphens and spaces local len = isbn_str:len();

if len ~= 10 and len ~= 13 then return false; end

if len == 10 then if isbn_str:match( "^%d*X?$" ) == nil then return false; end return is_valid_isxn(isbn_str, 10); else local temp = 0; if isbn_str:match( "^97[89]%d*$" ) == nil then return false; end -- isbn13 begins with 978 or 979 isbn_str = { isbn_str:byte(1, len) }; for i, v in ipairs( isbn_str ) do temp = temp + (3 - 2*(i % 2)) * tonumber( string.char(v) ); end return temp % 10 == 0; end end

-- Gets the display text for a wikilink like B or B gives B function removewikilink( str )

   return (str:gsub( "%[%[([^%[%]]*)%]%]", function(l)
       return l:gsub( "^[^|]*|(.*)$", "%1" ):gsub("^%s*(.-)%s*$", "%1");
   end));

end

-- Escape sequences for content that will be used for URL descriptions function safeforurl( str )

   if str:match( "%[%[.-%]%]" ) ~= nil then 
       table.insert( z.message_tail, { seterror( 'wikilink_in_url', {}, true ) } );
   end
   
   return str:gsub( '[%[%]\n]', {    
       ['['] = '[',
       [']'] = ']',
       ['\n'] = ' ' } );

end

-- Converts a hyphen to a dash function hyphentodash( str )

   if not is_set(str) or str:match( "[%[%]{}<>]" ) ~= nil then
       return str;
   end    
   return str:gsub( '-', '–' );

end

-- Protects a string that will be wrapped in wiki italic markup ... function safeforitalics( str )

   --[[ Note: We can not use  for italics, as the expected behavior for
   italics specified by ... in the title is that they will be inverted
   (i.e. unitalicized) in the resulting references.  In addition,  and 
   tend to interact poorly under Mediawiki's HTML tidy. ]]
   
   if not is_set(str) then
       return str;
   else
       if str:sub(1,1) == "'" then str = "" .. str; end
       if str:sub(-1,-1) == "'" then str = str .. ""; end
       
       -- Remove newlines as they break italics.
       return str:gsub( '\n', ' ' );
   end

end

--[[ Joins a sequence of strings together while checking for duplicate separation characters. ]] function safejoin( tbl, duplicate_char )

   --[[
   Note: we use string functions here, rather than ustring functions.
   
   This has considerably faster performance and should work correctly as 
   long as the duplicate_char is strict ASCII.  The strings
   in tbl may be ASCII or UTF8.
   ]]
   
   local str = ;
   local comp = ;
   local end_chr = ;
   local trim;
   for _, value in ipairs( tbl ) do
       if value == nil then value = ; end
       
       if str ==  then
           str = value;
       elseif value ~=  then
           if value:sub(1,1) == '<' then
               -- Special case of values enclosed in spans and other markup.
               comp = value:gsub( "%b<>", "" );
           else
               comp = value;
           end
           
           if comp:sub(1,1) == duplicate_char then
               trim = false;
               end_chr = str:sub(-1,-1);
               -- str = str .. "<HERE(enchr=" .. end_chr.. ")"
               if end_chr == duplicate_char then
                   str = str:sub(1,-2);
               elseif end_chr == "'" then
                   if str:sub(-3,-1) == duplicate_char .. "" then
                       str = str:sub(1, -4) .. "";
                   elseif str:sub(-5,-1) == duplicate_char .. "]]" then
                       trim = true;
                   elseif str:sub(-4,-1) == duplicate_char .. "]" then
                       trim = true;
                   end
               elseif end_chr == "]" then
                   if str:sub(-3,-1) == duplicate_char .. "]]" then
                       trim = true;
                   elseif str:sub(-2,-1) == duplicate_char .. "]" then
                       trim = true;
                   end
               elseif end_chr == " " then
                   if str:sub(-2,-1) == duplicate_char .. " " then
                       str = str:sub(1,-3);
                   end
               end
               if trim then
                   if value ~= comp then 
                       local dup2 = duplicate_char;
                       if dup2:match( "%A" ) then dup2 = "%" .. dup2; end
                       
                       value = value:gsub( "(%b<>)" .. dup2, "%1", 1 )
                   else
                       value = value:sub( 2, -1 );
                   end
               end
           end
           str = str .. value;
       end
   end
   return str;

end

-- Attempts to convert names to initials. function reducetoinitials(first)

   local initials = {}
   for word in string.gmatch(first, "%S+") do
       table.insert(initials, string.sub(word,1,1)) -- Vancouver format does not include full stops.
   end
   return table.concat(initials) -- Vancouver format does not include spaces.

end

-- Formats a list of people (e.g. authors / editors) function listpeople(control, people)

   local sep = control.sep;
   local namesep = control.namesep
   local format = control.format
   local maximum = control.maximum
   local lastauthoramp = control.lastauthoramp;
   local text = {}
   local etal = false;
   
   if sep:sub(-1,-1) ~= " " then sep = sep .. " " end
   if maximum ~= nil and maximum < 1 then return "", 0; end
   
   for i,person in ipairs(people) do
       if is_set(person.last) then
           local mask = person.mask
           local one
           local sep_one = sep;
           if maximum ~= nil and i > maximum then
               etal = true;
               break;
           elseif (mask ~= nil) then
               local n = tonumber(mask)
               if (n ~= nil) then
                   one = string.rep("—",n)
               else
                   one = mask;
                   sep_one = " ";
               end
           else
               one = person.last
               local first = person.first
               if is_set(first) then 
                   if ( "vanc" == format ) then first = reducetoinitials(first) end
                   one = one .. namesep .. first 
               end
               if is_set(person.link) then one = "" .. one .. "" end
           end
           table.insert( text, one )
           table.insert( text, sep_one )
       end
   end
   local count = #text / 2;
   if count > 0 then 
       if count > 1 and is_set(lastauthoramp) and not etal then
           text[#text-2] = " & ";
       end
       text[#text] = nil; 
   end
   
   local result = table.concat(text) -- construct list
   if etal then 
       local etal_text = cfg.messages['et al'];
       result = result .. " " .. etal_text;
   end
   
   -- if necessary wrap result in  tag to format in Small Caps
   if ( "scap" == format ) then result = 
       '' .. result .. '';
   end 
   return result, count

end

-- Generates a CITEREF anchor ID. function anchorid( options )

   return "CITEREF" .. table.concat( options );

end

-- Gets name list from the input arguments function extractnames(args, list_name)

   local names = {};
   local i = 1;
   local last;
   
   while true do
       last = selectone( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', i );
       if not is_set(last) then
           -- just in case someone passed in an empty parameter
           break;
       end
       names[i] = {
           last = last,
           first = selectone( args, cfg.aliases[list_name .. '-First'], 'redundant_parameters', i ),
           link = selectone( args, cfg.aliases[list_name .. '-Link'], 'redundant_parameters', i ),
           mask = selectone( args, cfg.aliases[list_name .. '-Mask'], 'redundant_parameters', i )
       };
       i = i + 1;
   end
   return names;

end

-- Populates ID table from arguments using configuration settings function extractids( args )

   local id_list = {};
   for k, v in pairs( cfg.id_handlers ) do    
       v = selectone( args, v.parameters, 'redundant_parameters' );
       if is_set(v) then id_list[k] = v; end
   end
   return id_list;

end

-- Takes a table of IDs and turns it into a table of formatted ID outputs. function buildidlist( id_list, options )

   local new_list, handler = {};
   
   function fallback(k) return { __index = function(t,i) return cfg.id_handlers[k][i] end } end;
   
   for k, v in pairs( id_list ) do
       -- fallback to read-only cfg
       handler = setmetatable( { ['id'] = v }, fallback(k) );
       
       if handler.mode == 'external' then
           table.insert( new_list, {handler.label, externallinkid( handler ) } );
       elseif handler.mode == 'internal' then
           table.insert( new_list, {handler.label, internallinkid( handler ) } );
       elseif handler.mode ~= 'manual' then
           error( cfg.messages['unknown_ID_mode'] );
       elseif k == 'DOI' then
           table.insert( new_list, {handler.label, doi( v, options.DoiBroken ) } );
       elseif k == 'ASIN' then
           table.insert( new_list, {handler.label, amazon( v, options.ASINTLD ) } ); 
       elseif k == 'OL' then
           table.insert( new_list, {handler.label, openlibrary( v ) } );
       elseif k == 'PMC' then
           table.insert( new_list, {handler.label, pmc( v, options.Embargo ) } );
       elseif k == 'PMID' then
           table.insert( new_list, {handler.label, pmid( v ) } );
       elseif k == 'ISSN' then
       	table.insert( new_list, {handler.label, issn( v ) } );
       elseif k == 'ISBN' then
           local ISBN = internallinkid( handler );
           if not checkisbn( v ) and not is_set(options.IgnoreISBN) then
               ISBN = ISBN .. seterror( 'bad_isbn', {}, false, " ", "" );
           end
           table.insert( new_list, {handler.label, ISBN } );                
       else
           error( cfg.messages['unknown_manual_ID'] );
       end
   end
   
   function comp( a, b )	-- used in following table.sort()
       return a[1] < b[1];
   end
   
   table.sort( new_list, comp );
   for k, v in ipairs( new_list ) do
       new_list[k] = v[2];
   end
   
   return new_list;

end

-- Chooses one matching parameter from a list of parameters to consider -- Generates an error if more than one match is present. function selectone( args, possible, error_condition, index )

   local value = nil;
   local selected = ;
   local error_list = {};
   
   if index ~= nil then index = tostring(index); end
   
   -- Handle special case of "#" replaced by empty string
   if index == '1' then
       for _, v in ipairs( possible ) do
           v = v:gsub( "#", "" );
           if is_set(args[v]) then
               if value ~= nil and selected ~= v then
                   table.insert( error_list, v );
               else
                   value = args[v];
                   selected = v;
               end
           end
       end        
   end
   
   for _, v in ipairs( possible ) do
       if index ~= nil then
           v = v:gsub( "#", index );
       end
       if is_set(args[v]) then
           if value ~= nil and selected ~=  v then
               table.insert( error_list, v );
           else
               value = args[v];
               selected = v;
           end
       end
   end
   
   if #error_list > 0 then
       local error_str = "";
       for _, k in ipairs( error_list ) do
           if error_str ~= "" then error_str = error_str .. cfg.messages['parameter-separator'] end
           error_str = error_str .. wrap( 'parameter', k );
       end
       if #error_list > 1 then
           error_str = error_str .. cfg.messages['parameter-final-separator'];
       else
           error_str = error_str .. cfg.messages['parameter-pair-separator'];
       end
       error_str = error_str .. wrap( 'parameter', selected );
       table.insert( z.message_tail, { seterror( error_condition, {error_str}, true ) } );
   end
   
   return value, selected;

end

-- COinS metadata (see <http://ocoins.info/>) allows automated tools to parse -- the citation information. function COinS(data)

   if 'table' ~= type(data) or nil == next(data) then
       return ;
   end
   
   local ctx_ver = "Z39.88-2004";
   
   -- treat table strictly as an array with only set values.
   local OCinSoutput = setmetatable( {}, {
       __newindex = function(self, key, value)
           if is_set(value) then
               rawset( self, #self+1, table.concat{ key, '=', mw.uri.encode( removewikilink( value ) ) } );
           end
       end
   });
   
   if is_set(data.Chapter) then
       OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
       OCinSoutput["rft.genre"] = "bookitem";
       OCinSoutput["rft.btitle"] = data.Chapter;
       OCinSoutput["rft.atitle"] = data.Title;
   elseif is_set(data.Periodical) then
       OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:journal";
       OCinSoutput["rft.genre"] = "article";
       OCinSoutput["rft.jtitle"] = data.Periodical;
       OCinSoutput["rft.atitle"] = data.Title;
   else
       OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
       OCinSoutput["rft.genre"] = "book"
       OCinSoutput["rft.btitle"] = data.Title;
   end
   
   OCinSoutput["rft.place"] = data.PublicationPlace;
   OCinSoutput["rft.date"] = data.Date;
   OCinSoutput["rft.series"] = data.Series;
   OCinSoutput["rft.volume"] = data.Volume;
   OCinSoutput["rft.issue"] = data.Issue;
   OCinSoutput["rft.pages"] = data.Pages;
   OCinSoutput["rft.edition"] = data.Edition;
   OCinSoutput["rft.pub"] = data.PublisherName;
   
   for k, v in pairs( data.ID_list ) do
       local id, value = cfg.id_handlers[k].COinS;
       if k == 'ISBN' then value = cleanisbn( v ); else value = v; end
       if string.sub( id or "", 1, 4 ) == 'info' then
           OCinSoutput["rft_id"] = table.concat{ id, "/", v };
       else
           OCinSoutput[ id ] = value;
       end
   end
   
   local last, first;
   for k, v in ipairs( data.Authors ) do
       last, first = v.last, v.first;
       if k == 1 then
           if is_set(last) then
               OCinSoutput["rft.aulast"] = last;
           end
           if is_set(first) then 
               OCinSoutput["rft.aufirst"] = first;
           end
       end
       if is_set(last) and is_set(first) then
           OCinSoutput["rft.au"] = table.concat{ last, ", ", first };
       elseif is_set(last) then
           OCinSoutput["rft.au"] = last;
       end
   end
   
   OCinSoutput.rft_id = data.URL;
   OCinSoutput.rfr_id = table.concat{ "info:sid/", mw.site.server:match( "[^/]*$" ), ":", data.RawPage };
   OCinSoutput = setmetatable( OCinSoutput, nil );
   
   -- sort with version string always first, and combine.
   table.sort( OCinSoutput );
   table.insert( OCinSoutput, 1, "ctx_ver=" .. ctx_ver );  -- such as "Z39.88-2004"
   return table.concat(OCinSoutput, "&");

end

--[[ This is the main function doing the majority of the citation formatting. ]] function citation0( config, args)

   --[[ 
   Load Input Parameters
   The argment_wrapper facillitates the mapping of multiple
   aliases to single internal variable.
   ]]
   local A = argument_wrapper( args );
   local i 
   local PPrefix = A['PPrefix']
   local PPPrefix = A['PPPrefix']
   if is_set( A['NoPP'] ) then PPPrefix = "" PPrefix = "" end
   
   -- Pick out the relevant fields from the arguments.  Different citation templates
   -- define different field names for the same underlying things.    
   local Authors = A['Authors'];
   local a = extractnames( args, 'AuthorList' );
   local Coauthors = A['Coauthors'];
   local Others = A['Others'];
   local Editors = A['Editors'];
   local e = extractnames( args, 'EditorList' );
   local Year = A['Year'];
   local PublicationDate = A['PublicationDate'];
   local OrigYear = A['OrigYear'];
   local Date = A['Date'];
   local LayDate = A['LayDate'];
   ------------------------------------------------- Get title data
   local Title = A['Title'];
   local BookTitle = A['BookTitle'];
   local Conference = A['Conference'];
   local TransTitle = A['TransTitle'];
   local TitleNote = A['TitleNote'];
   local TitleLink = A['TitleLink'];
   local Chapter = A['Chapter'];
   local ChapterLink = A['ChapterLink'];
   local TransChapter = A['TransChapter'];
   local TitleType = A['TitleType'];
   local Degree = A['Degree'];
   local Docket = A['Docket'];
   local ArchiveURL = A['ArchiveURL'];
   local URL = A['URL']
   local URLorigin = A:ORIGIN('URL');
   local ChapterURL = A['ChapterURL'];
   local ChapterURLorigin = A:ORIGIN('ChapterURL');
   local ConferenceURL = A['ConferenceURL'];
   local ConferenceURLorigin = A:ORIGIN('ConferenceURL');
   local Periodical = A['Periodical'];

--[[ Parameter remapping for cite encyclopedia: When the citation has these parameters: |encyclopedia and |title then map |title to |article and |encyclopedia to |title |encyclopedia and |article then map |encyclopedia to |title |encyclopedia then map |encyclopedia to |title

|trans_title maps to |trans_chapter when |title is re-mapped

All other combinations of |encyclopedia, |title, and |article are not modified ]] if ( config.CitationClass == "encyclopaedia" ) then if is_set(Periodical) then -- Periodical is set when |encyclopedia is set if is_set(Title) then if not is_set(Chapter) then Chapter = Title; -- |encyclopedia and |title are set so map |title to |article and |encyclopedia to |title TransChapter = TransTitle; Title = Periodical; Periodical = ; -- redundant so unset TransTitle = ; -- redundant so unset end else -- |title not set Title = Periodical; -- |encyclopedia set and |article set or not set so map |encyclopedia to |title Periodical = ; -- redundant so unset end end end

local Series = A['Series'];

   local Volume = A['Volume'];
   local Issue = A['Issue'];
   local Position = ;
   local Page, Pages, At, page_type;
   
   Page = A['Page'];
   Pages = hyphentodash( A['Pages'] );
   At = A['At'];
   
   if is_set(Page) then
       if is_set(Pages) or is_set(At) then
           Page = Page .. " " .. seterror('extra_pages');
           Pages = ;
           At = ;
       end
   elseif is_set(Pages) then
       if is_set(At) then
           Pages = Pages .. " " .. seterror('extra_pages');
           At = ;
       end
   end    
   
   local Edition = A['Edition'];
   local PublicationPlace = A['PublicationPlace']
   local Place = A['Place'];
   
   if not is_set(PublicationPlace) and is_set(Place) then
       PublicationPlace = Place;
   end
   
   if PublicationPlace == Place then Place = ; end
   
   local PublisherName = A['PublisherName'];
   local RegistrationRequired = A['RegistrationRequired'];
   local SubscriptionRequired = A['SubscriptionRequired'];
   local Via = A['Via'];
   local AccessDate = A['AccessDate'];
   local ArchiveDate = A['ArchiveDate'];
   local Agency = A['Agency'];
   local DeadURL = A['DeadURL']
   local Language = A['Language'];
   local Format = A['Format'];
   local Ref = A['Ref'];
   
   local DoiBroken = A['DoiBroken'];

-- Special case for cite techreport. local ID = A['ID']; if (config.CitationClass == "techreport") then -- special case for cite techreport if is_set(Issue) then -- cite techreport uses 'number', which other citations aliase to 'issue' if not is_set(ID) then -- can we use ID for the "number"? ID = Issue; -- yes, use it Issue = ""; -- unset Issue so that "number" isn't duplicated in the rendered citation or COinS metadata else -- can't use ID so emit error message ID = ID .. " " .. seterror('redundant_parameters', '|id= and |number='); end end end

   local ASINTLD = A['ASINTLD'];
   local IgnoreISBN = A['IgnoreISBN'];
   local Embargo = A['Embargo'];
   local ID_list = extractids( args );
   
   local Quote = A['Quote'];
   local PostScript = A['PostScript'];
   local LayURL = A['LayURL'];
   local LaySource = A['LaySource'];
   local Transcript = A['Transcript'];
   local TranscriptURL = A['TranscriptURL'] 
   local TranscriptURLorigin = A:ORIGIN('TranscriptURL');
   local sepc = A['Separator'];
   local LastAuthorAmp = A['LastAuthorAmp'];
   local no_tracking_cats = A['NoTracking'];
   local use_lowercase = ( sepc ~= '.' );
   local this_page = mw.title.getCurrentTitle();  --Also used for COinS and for language
   
   if not is_set(no_tracking_cats) then
       for k, v in pairs( cfg.uncategorized_namespaces ) do
           if this_page.nsText == v then
               no_tracking_cats = "true";
               break;
           end
       end
   end

local anchor_year; -- used in the CITEREF identifier local COinS_date; -- used in the COinS metadata

-- legacy: promote concatenation of |day=, |month=, and |year= to Date if Date not set; or, promote PublicationDate to Date if neither Date nor Year are set. if not is_set(Date) then Date = Year; -- promote Year to Date Year = nil; -- make nil so Year as empty string isn't used for CITEREF if is_set(Date) then local Month = A['Month']; if is_set(Month) then Date = Month .. " " .. Date; local Day = A['Day'] if is_set(Day) then Date = Day .. " " .. Date end end elseif is_set(PublicationDate) then -- use PublicationDate when |date= and |year= are not set Date = PublicationDate; -- promonte PublicationDate to Date PublicationDate = ; -- unset, no longer needed end end

if PublicationDate == Date then PublicationDate = ; end -- if PublicationDate is same as Date, don't display in rendered citation

-- Go test all of the date-holding parameters for valid MOS:DATE format and make sure that dates are real dates. -- TODO: 2013-10-27: AirDate is nil when dates() is called because it hasn't been set yet. Move the call to dates() or set AirDate earlier. anchor_year, COinS_date = dates({['accessdate']=AccessDate, ['airdate']=AirDate, ['archivedate']=ArchiveDate, ['date']=Date, ['doi_brokendate']=DoiBroken, ['embargo']=Embargo, ['laydate']=LayDate, ['publicationdate']=PublicationDate, ['year']=Year});

-- At this point fields may be nil if they weren't specified in the template use. We can use that fact.

--Account for the oddity that is Empty citation (help)  with |pmc= set and |url= not set if config.CitationClass == "journal" and not is_set(URL) and is_set(ID_list['PMC']) then if not is_embargoed(Embargo) then URL=cfg.id_handlers['PMC'].prefix .. ID_list['PMC']; -- set url to be the same as the PMC external link if not embargoed URLorigin = cfg.id_handlers['PMC'].parameters[1]; -- set URLorigin to parameter name for use in error message if citation is missing a |title= end end

   -- Account for the oddity that is Empty citation (help) , before generation of COinS data.
   if is_set(BookTitle) then
       Chapter = Title;
       ChapterLink = TitleLink;
       TransChapter = TransTitle;
       Title = BookTitle;
       TitleLink = ;
       TransTitle = ;
   end
   -- Account for the oddity that is ., before generation of COinS data.
   if config.CitationClass == "episode" then
       local AirDate = A['AirDate'];
       local SeriesLink = A['SeriesLink'];
       local Season = A['Season'];
       local SeriesNumber = A['SeriesNumber'];
       local Network = A['Network'];
       local Station = A['Station'];
       local s, n = {}, {};
       local Sep = (first_set(A["SeriesSeparator"], A["Separator"]) or "") .. " ";
       
       if is_set(Issue) then table.insert(s, cfg.messages["episode"] .. " " .. Issue); Issue = ; end
       if is_set(Season) then table.insert(s, cfg.messages["season"] .. " " .. Season); end
       if is_set(SeriesNumber) then table.insert(s, cfg.messages["series"] .. " " .. SeriesNumber); end
       if is_set(Network) then table.insert(n, Network); end
       if is_set(Station) then table.insert(n, Station); end
       
       Date = Date or AirDate;
       Chapter = Title;
       ChapterLink = TitleLink;
       TransChapter = TransTitle;
       Title = Series;
       TitleLink = SeriesLink;
       TransTitle = ;
       
       Series = table.concat(s, Sep);
       ID = table.concat(n, Sep);
   end
   
   -- COinS metadata (see <http://ocoins.info/>) for
   -- automated parsing of citation information.
   local OCinSoutput = COinS{
       ['Periodical'] = Periodical,
       ['Chapter'] = Chapter,
       ['Title'] = Title,
       ['PublicationPlace'] = PublicationPlace,
       ['Date'] = first_set(COinS_date, Date),		-- COinS_date has correctly formatted date if Date is valid; any reason to keep Date here?  Should we be including invalid dates in metadata?
       ['Series'] = Series,
       ['Volume'] = Volume,
       ['Issue'] = Issue,
       ['Pages'] = first_set(Page, Pages, At),
       ['Edition'] = Edition,
       ['PublisherName'] = PublisherName,
       ['URL'] = first_set( URL, ChapterURL ),
       ['Authors'] = a,
       ['ID_list'] = ID_list,
       ['RawPage'] = this_page.prefixedText,
   };
   if is_set(Periodical) and not is_set(Chapter) and is_set(Title) then
       Chapter = Title;
       ChapterLink = TitleLink;
       TransChapter = TransTitle;
       Title = ;
       TitleLink = ;
       TransTitle = ;
   end
   -- Now perform various field substitutions.
   -- We also add leading spaces and surrounding markup and punctuation to the
   -- various parts of the citation, but only when they are non-nil.
   if not is_set(Authors) then
       local Maximum = tonumber( A['DisplayAuthors'] );
       
       -- Preserve old-style implicit et al.
       if not is_set(Maximum) and #a == 9 then 
           Maximum = 8;
           table.insert( z.message_tail, { seterror('implict_etal_author', {}, true ) } );
       elseif not is_set(Maximum) then
           Maximum = #a + 1;
       end
           
       local control = { 
           sep = A["AuthorSeparator"] .. " ",
           namesep = (first_set(A["AuthorNameSeparator"], A["NameSeparator"]) or "") .. " ",
           format = A["AuthorFormat"],
           maximum = Maximum,
           lastauthoramp = LastAuthorAmp
       };
       
       -- If the coauthor field is also used, prevent ampersand and et al. formatting.
       if is_set(Coauthors) then
           control.lastauthoramp = nil;
           control.maximum = #a + 1;
       end
       
       Authors = listpeople(control, a) 
   end

if not is_set(Authors) and is_set(Coauthors) then -- coauthors aren't displayed if one of authors=, authorn=, or lastn= isn't specified table.insert( z.message_tail, { seterror('coauthors_missing_author', {}, true) } ); -- emit error message end

   local EditorCount
   if not is_set(Editors) then
       local Maximum = tonumber( A['DisplayEditors'] );
       -- Preserve old-style implicit et al.
       if not is_set(Maximum) and #e == 4 then 
           Maximum = 3;
           table.insert( z.message_tail, { seterror('implict_etal_editor', {}, true) } );
       elseif not is_set(Maximum) then
           Maximum = #e + 1;
       end
       local control = { 
           sep = A["EditorSeparator"] .. " ",
           namesep = (first_set(A["EditorNameSeparator"], A["NameSeparator"]) or "") .. " ",
           format = A['EditorFormat'],
           maximum = Maximum,
           lastauthoramp = LastAuthorAmp
       };
       Editors, EditorCount = listpeople(control, e);
   else
       EditorCount = 1;
   end
   local Cartography = "";
   local Scale = "";
   if config.CitationClass == "map" then
       if not is_set( Authors ) and is_set( PublisherName ) then
           Authors = PublisherName;
           PublisherName = "";
       end
       Cartography = A['Cartography'];
       if is_set( Cartography ) then
           Cartography = sepc .. " " .. wrap( 'cartography', Cartography, use_lowercase );
       end        
       Scale = A['Scale'];
       if is_set( Scale ) then
           Scale = sepc .. " " .. Scale;
       end        
   end
   
   if  not is_set(URL) and
       not is_set(ChapterURL) and
       not is_set(ArchiveURL) and
       not is_set(ConferenceURL) and
       not is_set(TranscriptURL) then
       
       -- Test if cite web or cite podcast |url= is missing or empty 

if inArray(config.CitationClass, {"web","podcast"}) then table.insert( z.message_tail, { seterror( 'cite_web_url', {}, true ) } ); end

       -- Test if accessdate is given without giving a URL
       if is_set(AccessDate) then
           table.insert( z.message_tail, { seterror( 'accessdate_missing_url', {}, true ) } );
           AccessDate = ;
       end
       
       -- Test if format is given without giving a URL
       if is_set(Format) then
           Format = Format .. seterror( 'format_missing_url' );
       end
   end
   
   -- Test if citation has no title
   if  not is_set(Chapter) and
       not is_set(Title) and
       not is_set(Periodical) and
       not is_set(Conference) and
       not is_set(TransTitle) and
       not is_set(TransChapter) then
       table.insert( z.message_tail, { seterror( 'citation_missing_title', {}, true ) } );
   end
   
   Format = is_set(Format) and " (" .. Format .. ")" or "";
   
   local OriginalURL = URL
   DeadURL = DeadURL:lower();
   if is_set( ArchiveURL ) then
       if ( DeadURL ~= "no" ) then
           URL = ArchiveURL
           URLorigin = A:ORIGIN('ArchiveURL')
       end
   end
   
   -- Format chapter / article title
   if is_set(Chapter) and is_set(ChapterLink) then 
       Chapter = "" .. Chapter .. "";
   end
   if is_set(Periodical) and is_set(Title) then
       Chapter = wrap( 'italic-title', Chapter );
       TransChapter = wrap( 'trans-italic-title', TransChapter );
   else

Chapter = kern_quotes (Chapter); -- if necessary, separate chapter title's leading and trailing quote marks from Module provided quote marks

       Chapter = wrap( 'quoted-title', Chapter );
       TransChapter = wrap( 'trans-quoted-title', TransChapter );
   end
   
   local TransError = ""
   if is_set(TransChapter) then
       if not is_set(Chapter) then
           TransError = " " .. seterror( 'trans_missing_chapter' );
       else
           TransChapter = " " .. TransChapter;
       end
   end
   
   Chapter = Chapter .. TransChapter;
   
   if is_set(Chapter) then
       if not is_set(ChapterLink) then
           if is_set(ChapterURL) then
               Chapter = externallink( ChapterURL, Chapter ) .. TransError;
               if not is_set(URL) then
                   Chapter = Chapter .. Format;
                   Format = "";
               end
           elseif is_set(URL) then 
               Chapter = externallink( URL, Chapter ) .. TransError .. Format;
               URL = "";
               Format = "";
           else
               Chapter = Chapter .. TransError;
           end            
       elseif is_set(ChapterURL) then
           Chapter = Chapter .. " " .. externallink( ChapterURL, nil, ChapterURLorigin ) .. 
               TransError;
       else
           Chapter = Chapter .. TransError;
       end
       Chapter = Chapter .. sepc .. " " -- with end-space
   elseif is_set(ChapterURL) then
       Chapter = " " .. externallink( ChapterURL, nil, ChapterURLorigin ) .. sepc .. " ";
   end        
   
   -- Format main title.
   if is_set(TitleLink) and is_set(Title) then
       Title = "" .. Title .. ""
   end
   
   if is_set(Periodical) then

Title = kern_quotes (Title); -- if necessary, separate title's leading and trailing quote marks from Module provided quote marks

       Title = wrap( 'quoted-title', Title );
       TransTitle = wrap( 'trans-quoted-title', TransTitle );
   elseif inArray(config.CitationClass, {"web","news","pressrelease","conference","podcast"}) and
           not is_set(Chapter) then

Title = kern_quotes (Title); -- if necessary, separate title's leading and trailing quote marks from Module provided quote marks

       Title = wrap( 'quoted-title', Title );
       TransTitle = wrap( 'trans-quoted-title', TransTitle );
   else
       Title = wrap( 'italic-title', Title );
       TransTitle = wrap( 'trans-italic-title', TransTitle );
   end
   
   TransError = "";
   if is_set(TransTitle) then
       if not is_set(Title) then
           TransError = " " .. seterror( 'trans_missing_title' );
       else
           TransTitle = " " .. TransTitle;
       end
   end
   
   Title = Title .. TransTitle;
   
   if is_set(Title) then
       if not is_set(TitleLink) and is_set(URL) then 
           Title = externallink( URL, Title ) .. TransError .. Format       
           URL = "";
           Format = "";
       else
           Title = Title .. TransError;
       end
   end
   
   if is_set(Place) then
       Place = " " .. wrap( 'written', Place, use_lowercase ) .. sepc .. " ";
   end
   
   if is_set(Conference) then
       if is_set(ConferenceURL) then
           Conference = externallink( ConferenceURL, Conference );
       end
       Conference = sepc .. " " .. Conference
   elseif is_set(ConferenceURL) then
       Conference = sepc .. " " .. externallink( ConferenceURL, nil, ConferenceURLorigin );
   end
   
   if not is_set(Position) then
       local Minutes = A['Minutes'];
       if is_set(Minutes) then
           Position = " " .. Minutes .. " " .. cfg.messages['minutes'];
       else
           local Time = A['Time'];
           if is_set(Time) then
               local TimeCaption = A['TimeCaption']
               if not is_set(TimeCaption) then
                   TimeCaption = cfg.messages['event'];
                   if sepc ~= '.' then
                       TimeCaption = TimeCaption:lower();
                   end
               end
               Position = " " .. TimeCaption .. " " .. Time;
           end
       end
   else
       Position = " " .. Position;
       At = ;
   end
   
   if not is_set(Page) then
       if is_set(Pages) then
           if is_set(Periodical) and
               not inArray(config.CitationClass, {"encyclopaedia","web","book","news","podcast"}) then
               Pages = ": " .. Pages;
           elseif tonumber(Pages) ~= nil then
               Pages = sepc .." " .. PPrefix .. Pages;
           else
               Pages = sepc .." " .. PPPrefix .. Pages;
           end
       end
   else
       if is_set(Periodical) and
           not inArray(config.CitationClass, {"encyclopaedia","web","book","news","podcast"}) then
           Page = ": " .. Page;
       else
           Page = sepc .." " .. PPrefix .. Page;
       end
   end
   
   At = is_set(At) and (sepc .. " " .. At) or "";
   Position = is_set(Position) and (sepc .. " " .. Position) or "";
   if config.CitationClass == 'map' then
       local Section = A['Section'];
       local Inset = A['Inset'];
       if first_set( Pages, Page, At ) ~= nil or sepc ~= '.' then
           if is_set( Section ) then
               Section = ", " .. wrap( 'section', Section, true );
           end
           if is_set( Inset ) then
               Inset = ", " .. wrap( 'inset', Inset, true );
           end
       else
           if is_set( Section ) then
               Section = sepc .. " " .. wrap( 'section', Section, use_lowercase );
               if is_set( Inset ) then
                   Inset = ", " .. wrap( 'inset', Inset, true );
               end
           elseif is_set( Inset ) then
               Inset = sepc .. " " .. wrap( 'inset', Inset, use_lowercase );
           end            
       end            
       At = At .. Section .. Inset;        
   end    

--[[Look in the list of iso639-1 language codes to see if the value provided in the language parameter matches one of them. If a match is found, use that value; if not, then use the value that was provided with the language parameter.

Categories are assigned in a manner similar to the Template:Xx icon templates - categorizes only mainspace citations and only when the language code is not 'en' (English). ]] if is_set (Language) then -- local name = mw.language.fetchLanguageName( Language:lower(), "en" ); -- experiment: this seems to return correct ISO 639-1 language names local name = cfg.iso639_1[Language:lower()]; -- get the language name if Language parameter has a valid iso 639-1 code if nil == name then Language=" " .. wrap( 'language', Language ); -- no match, use parameter's value else if 0 == this_page.namespace and 'en' ~= Language:lower() then --found a match; is this page main / article space and English not the language? Language=" " .. wrap( 'language', name .. ); -- in main space and not English: categorize else Language=" " .. wrap( 'language', name ); --not in mainspace or language is English so don't categorize end end else Language=""; -- language not specified so make sure this is an empty string; end

Others = is_set(Others) and (sepc .. " " .. Others) or "";

-- handle type parameter for those CS1 citations that have default values

if inArray(config.CitationClass, {"podcast","pressrelease","techreport","thesis"}) then TitleType = set_titletype (config.CitationClass, TitleType); if is_set(Degree) and "Thesis" == TitleType then -- special case for cite thesis TitleType = Degree .. " thesis"; end end

if is_set(TitleType) then -- if type parameter is specified TitleType = " (" .. TitleType .. ")"; -- display it in parentheses end

TitleNote = is_set(TitleNote) and (sepc .. " " .. TitleNote) or "";

   Edition = is_set(Edition) and (" " .. wrap( 'edition', Edition )) or "";
   Issue = is_set(Issue) and (" (" .. Issue .. ")") or "";
   Series = is_set(Series) and (sepc .. " " .. Series) or "";
   OrigYear = is_set(OrigYear) and (" [" .. OrigYear .. "]") or "";
   Agency = is_set(Agency) and (sepc .. " " .. Agency) or "";
   
   if is_set(Volume) then
       if ( mw.ustring.len(Volume) > 4 )
         then Volume = sepc .." " .. Volume;
         else Volume = " " .. hyphentodash(Volume) .. "";
       end
   end
   
   ------------------------------------ totally unrelated data
   --[[ Loosely mimic (subscription required) template; Via parameter identifies a delivery source that is not the publisher; these sources often, but not always, exist
   behind a registration or paywall.  So here, we've chosen to decouple via from subscription (via has never been part of the registration required template).
   
   Subscription implies paywall; Registration does not.  If both are used in a citation, the subscription required link note is displayed. There are no error messages for this condition.
   ]]
   if is_set(Via) then
       Via = " " .. wrap( 'via', Via );
   end

if is_set(SubscriptionRequired) then

       SubscriptionRequired = sepc .. " " .. cfg.messages['subscription']; --here when 'via' parameter not used but 'subscription' is
   elseif is_set(RegistrationRequired) then
       SubscriptionRequired = sepc .. " " .. cfg.messages['registration']; --here when 'via' and 'subscription' parameters not used but 'registration' is
   end
   if is_set(AccessDate) then
       local retrv_text = " " .. cfg.messages['retrieved']
       if (sepc ~= ".") then retrv_text = retrv_text:lower() end
       AccessDate = '' .. sepc
           .. substitute( retrv_text, {AccessDate} ) .. ''
   end
   
   if is_set(ID) then ID = sepc .." ".. ID; end
  	if "thesis" == config.CitationClass and is_set(Docket) then

ID = sepc .." Docket ".. Docket .. ID; end


   ID_list = buildidlist( ID_list, {DoiBroken = DoiBroken, ASINTLD = ASINTLD, IgnoreISBN = IgnoreISBN, Embargo=Embargo} );
   if is_set(URL) then
       URL = " " .. externallink( URL, nil, URLorigin );
   end
   if is_set(Quote) then
       if Quote:sub(1,1) == '"' and Quote:sub(-1,-1) == '"' then
           Quote = Quote:sub(2,-2);
       end
       Quote = sepc .." " .. wrap( 'quoted-text', Quote ); 
       PostScript = "";
   elseif PostScript:lower() == "none" then
       PostScript = "";
   end
   
   local Archived
   if is_set(ArchiveURL) then
       if not is_set(ArchiveDate) then
           ArchiveDate = seterror('archive_missing_date');
       end
       if "no" == DeadURL then
           local arch_text = cfg.messages['archived'];
           if sepc ~= "." then arch_text = arch_text:lower() end
           Archived = sepc .. " " .. substitute( cfg.messages['archived-not-dead'],
               { externallink( ArchiveURL, arch_text ), ArchiveDate } );
           if not is_set(OriginalURL) then
               Archived = Archived .. " " .. seterror('archive_missing_url');                               
           end
       elseif is_set(OriginalURL) then
           local arch_text = cfg.messages['archived-dead'];
           if sepc ~= "." then arch_text = arch_text:lower() end
           Archived = sepc .. " " .. substitute( arch_text,
               { externallink( OriginalURL, cfg.messages['original'] ), ArchiveDate } );
       else
           local arch_text = cfg.messages['archived-missing'];
           if sepc ~= "." then arch_text = arch_text:lower() end
           Archived = sepc .. " " .. substitute( arch_text, 
               { seterror('archive_missing_url'), ArchiveDate } );
       end
   else
       Archived = ""
   end
   
   local Lay
   if is_set(LayURL) then
       if is_set(LayDate) then LayDate = " (" .. LayDate .. ")" end
       if is_set(LaySource) then 
           LaySource = " – " .. safeforitalics(LaySource) .. "";
       else
           LaySource = "";
       end
       if sepc == '.' then
           Lay = sepc .. " " .. externallink( LayURL, cfg.messages['lay summary'] ) .. LaySource .. LayDate
       else
           Lay = sepc .. " " .. externallink( LayURL, cfg.messages['lay summary']:lower() ) .. LaySource .. LayDate
       end            
   else
       Lay = "";
   end
   
   if is_set(Transcript) then
       if is_set(TranscriptURL) then Transcript = externallink( TranscriptURL, Transcript ); end
   elseif is_set(TranscriptURL) then
       Transcript = externallink( TranscriptURL, nil, TranscriptURLorigin );
   end
   
   local Publisher;
   if is_set(Periodical) and
       not inArray(config.CitationClass, {"encyclopaedia","web","pressrelease","podcast"}) then
       if is_set(PublisherName) then
           if is_set(PublicationPlace) then
               Publisher = PublicationPlace .. ": " .. PublisherName;
           else
               Publisher = PublisherName;  
           end
       elseif is_set(PublicationPlace) then
           Publisher= PublicationPlace;
       else 
           Publisher = "";
       end
       if is_set(PublicationDate) then
           if is_set(Publisher) then
               Publisher = Publisher .. ", " .. wrap( 'published', PublicationDate );
           else
               Publisher = PublicationDate;
           end
       end
       if is_set(Publisher) then
           Publisher = " (" .. Publisher .. ")";
       end
   else
       if is_set(PublicationDate) then
           PublicationDate = " (" .. wrap( 'published', PublicationDate ) .. ")";
       end
       if is_set(PublisherName) then
           if is_set(PublicationPlace) then
               Publisher = sepc .. " " .. PublicationPlace .. ": " .. PublisherName .. PublicationDate;
           else
               Publisher = sepc .. " " .. PublisherName .. PublicationDate;  
           end            
       elseif is_set(PublicationPlace) then 
           Publisher= sepc .. " " .. PublicationPlace .. PublicationDate;
       else 
           Publisher = PublicationDate;
       end
   end
   
   -- Several of the above rely upon detecting this as nil, so do it last.
   if is_set(Periodical) then
       if is_set(Title) or is_set(TitleNote) then 
           Periodical = sepc .. " " .. wrap( 'italic-title', Periodical ) 
       else 
           Periodical = wrap( 'italic-title', Periodical )
       end
   end

--[[ Handle the oddity that is cite speech. This code overrides whatever may be the value assigned to TitleNote (through |department=) and forces it to be " (Speech)" so that the annotation directly follows the |title= parameter value in the citation rather than the |event= parameter value (if provided). ]] if "speech" == config.CitationClass then -- cite speech only TitleNote = " (Speech)"; -- annotate the citation if is_set (Periodical) then -- if Periodical, perhaps because of an included |website= or |journal= parameter if is_set (Conference) then -- and if |event= is set Conference = Conference .. sepc .. " "; -- then add appropriate punctuation to the end of the Conference variable before rendering end end end

   -- Piece all bits together at last.  Here, all should be non-nil.
   -- We build things this way because it is more efficient in LUA
   -- not to keep reassigning to the same string variable over and over.
   local tcommon
   if inArray(config.CitationClass, {"journal","citation"}) and is_set(Periodical) then
       if is_set(Others) then Others = Others .. sepc .. " " end
       tcommon = safejoin( {Others, Title, TitleNote, Conference, Periodical, Format, TitleType, Scale, Series, 
           Language, Cartography, Edition, Publisher, Agency, Volume, Issue}, sepc );
   else 
       tcommon = safejoin( {Title, TitleNote, Conference, Periodical, Format, TitleType, Scale, Series, Language, 
           Volume, Issue, Others, Cartography, Edition, Publisher, Agency}, sepc );
   end
   
   if #ID_list > 0 then
       ID_list = safejoin( { sepc .. " ",  table.concat( ID_list, sepc .. " " ), ID }, sepc );
   else
       ID_list = ID;
   end
   
   local idcommon = safejoin( { ID_list, URL, Archived, AccessDate, Via, SubscriptionRequired, Lay, Quote }, sepc );
   local text;
   local pgtext = Position .. Page .. Pages .. At;
   
   if is_set(Authors) then
       if is_set(Coauthors) then
           Authors = Authors .. A['AuthorSeparator'] .. " " .. Coauthors
       end
       if is_set(Date) then
           Date = " ("..Date..")" .. OrigYear .. sepc .. " "
       elseif string.sub(Authors,-1,-1) == sepc then
           Authors = Authors .. " "
       else
           Authors = Authors .. sepc .. " "
       end
       if is_set(Editors) then
           local in_text = " ";
           local post_text = "";
           if is_set(Chapter) then
               in_text = in_text .. cfg.messages['in'] .. " "
           else
               if EditorCount <= 1 then
                   post_text = ", " .. cfg.messages['editor'];
               else
                   post_text = ", " .. cfg.messages['editors'];
               end
           end 
           if (sepc ~= '.') then in_text = in_text:lower() end
           Editors = in_text .. Editors .. post_text;
           if (string.sub(Editors,-1,-1) == sepc)
               then Editors = Editors .. " "
               else Editors = Editors .. sepc .. " "
           end
       end
       text = safejoin( {Authors, Date, Chapter, Place, Editors, tcommon }, sepc );
       text = safejoin( {text, pgtext, idcommon}, sepc );
   elseif is_set(Editors) then
       if is_set(Date) then
           if EditorCount <= 1 then
               Editors = Editors .. ", " .. cfg.messages['editor'];
           else
               Editors = Editors .. ", " .. cfg.messages['editors'];
           end
           Date = " (" .. Date ..")" .. OrigYear .. sepc .. " "
       else
           if EditorCount <= 1 then
               Editors = Editors .. " (" .. cfg.messages['editor'] .. ")" .. sepc .. " "
           else
               Editors = Editors .. " (" .. cfg.messages['editors'] .. ")" .. sepc .. " "
           end
       end
       text = safejoin( {Editors, Date, Chapter, Place, tcommon}, sepc );
       text = safejoin( {text, pgtext, idcommon}, sepc );
   else
       if is_set(Date) then
           if ( string.sub(tcommon,-1,-1) ~= sepc )
             then Date = sepc .." " .. Date .. OrigYear
             else Date = " " .. Date .. OrigYear
           end
       end
       if config.CitationClass=="journal" and is_set(Periodical) then
           text = safejoin( {Chapter, Place, tcommon}, sepc );
           text = safejoin( {text, pgtext, Date, idcommon}, sepc );
       else
           text = safejoin( {Chapter, Place, tcommon, Date}, sepc );
           text = safejoin( {text, pgtext, idcommon}, sepc );
       end
   end
   
   if is_set(PostScript) and PostScript ~= sepc then
       text = safejoin( {text, sepc}, sepc );  --Deals with italics, spaces, etc.
       text = text:sub(1,-2); --Remove final seperator    
   end    
   
   text = safejoin( {text, PostScript}, sepc );
   -- Now enclose the whole thing in a  element
   local options = {};
   
   if is_set(config.CitationClass) and config.CitationClass ~= "citation" then
       options.class = "citation " .. config.CitationClass;
   else
       options.class = "citation";
   end
   
   if is_set(Ref) and Ref:lower() ~= "none" then
       local id = Ref
       if ( "harv" == Ref ) then
           local names = {} --table of last names & year
           if #a > 0 then
               for i,v in ipairs(a) do 
                   names[i] = v.last 
                   if i == 4 then break end
               end
           elseif #e > 0 then
               for i,v in ipairs(e) do 
                   names[i] = v.last 
                   if i == 4 then break end                
               end
           end

names[ #names + 1 ] = first_set(Year, anchor_year); -- Year first for legacy citations

           id = anchorid(names)
       end
       options.id = id;
   end
   
   if string.len(text:gsub("<span[^>/]*>.-", ""):gsub("%b<>","")) <= 2 then
       z.error_categories = {};
       text = seterror('empty_citation');
       z.message_tail = {};
   end
   
   if is_set(options.id) then 
       text = '' .. text .. "";
   else
       text = '' .. text .. "";
   end        
   local empty_span = ' ';
   
   -- Note: Using display: none on then COinS span breaks some clients.
   local OCinS = '' .. empty_span .. '';
   text = text .. OCinS;
   
   if #z.message_tail ~= 0 then
       text = text .. " ";
       for i,v in ipairs( z.message_tail ) do
           if is_set(v[1]) then
               if i == #z.message_tail then
                   text = text .. errorcomment( v[1], v[2] );
               else
                   text = text .. errorcomment( v[1] .. "; ", v[2] );
               end
           end
       end
   end
   
   no_tracking_cats = no_tracking_cats:lower();
   if inArray(no_tracking_cats, {"", "no", "false", "n"}) then
       for _, v in ipairs( z.error_categories ) do
           text = text .. ;
       end
   end
   
   return text

end

-- This is used by templates such as Empty citation (help)  to create the actual citation text. function z.citation(frame)

   local pframe = frame:getParent()
   
   local args = {};
   local suggestions = {};
   local error_text, error_state;
   local config = {};
   for k, v in pairs( frame.args ) do
       config[k] = v;
       args[k] = v;       
   end    
   for k, v in pairs( pframe.args ) do
       if v ~=  then
           if not validate( k ) then            
               error_text = "";
               if type( k ) ~= 'string' then
                   -- Exclude empty numbered parameters
                   if v:match("%S+") ~= nil then
                       error_text, error_state = seterror( 'text_ignored', {v}, true );
                   end
               elseif validate( k:lower() ) then 
                   error_text, error_state = seterror( 'parameter_ignored_suggest', {k, k:lower()}, true );
               else
                   if #suggestions == 0 then
                       suggestions = mw.loadData( 'Module:Citation/CS1/Suggestions' );
                   end
                   if suggestions[ k:lower() ] ~= nil then
                       error_text, error_state = seterror( 'parameter_ignored_suggest', {k, suggestions[ k:lower() ]}, true );
                   else
                       error_text, error_state = seterror( 'parameter_ignored', {k}, true );
                   end
               end                  
               if error_text ~=  then
                   table.insert( z.message_tail, {error_text, error_state} );
               end                
           end
           args[k] = v;
       elseif args[k] ~= nil or (k == 'postscript') then
           args[k] = v;
       end        
   end    
   
   return citation0( config, args)

end

return z