الفرق بين المراجعتين لصفحة: «وحدة:Citation/CS1»

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(Module:Citation/CS1)
 
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سطر 1: سطر 1:
local z = {
local z = {
error_categories = {}; -- for categorizing citations that contain errors
    error_categories = {};
error_ids = {};
    error_ids = {};
message_tail = {};
    message_tail = {};
maintenance_cats = {}; -- for categorizing citations that aren't erroneous per se, but could use a little work
properties_cats = {}; -- for categorizing citations based on certain properties, language of source for instance
}
}


--[[--------------------------< F O R W A R D  D E C L A R A T I O N S >--------------------------------------
-- Include translation message hooks, ID and error handling configuration settings.
]]
local cfg = mw.loadData( 'Module:Citation/CS1/Configuration' );
local dates, year_date_check -- functions in Module:Citation/CS1/Date_validation


local cfg = {}; -- table of configuration tables that are defined in Module:Citation/CS1/Configuration
-- Contains a list of all recognized parameters
local whitelist = {}; -- table of tables listing valid template parameter names; defined in Module:Citation/CS1/Whitelist
local whitelist = mw.loadData( 'Module:Citation/CS1/Whitelist' );


--[[--------------------------< I S _ S E T >------------------------------------------------------------------
-- Whether variable is set or not
 
Returns true if argument is set; false otherwise. Argument is 'set' when it exists (not nil) or when it is not an empty string.
This function is global because it is called from both this module and from Date validation
 
]]
function is_set( var )
function is_set( var )
return not (var == nil or var == '');
    return not (var == nil or var == '');
end
 
--[[--------------------------< F I R S T _ S E T >------------------------------------------------------------
 
First set variable or nil if none
 
]]
 
local function first_set(...)
local list = {...};
for _, var in pairs(list) do
if is_set( var ) then
return var;
end
end
end
 
--[[--------------------------< I N _ A R R A Y >--------------------------------------------------------------
 
Whether needle is in haystack
 
]]
 
local function in_array( 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
 
--[[--------------------------< S U B S T I T U T E >----------------------------------------------------------
 
Populates numbered arguments in a message string using an argument table.
 
]]
 
local function substitute( msg, args )
return args and mw.message.newRawMessage( msg, args ):plain() or msg;
end
 
--[[--------------------------< E R R O R _ C O M M E N T >----------------------------------------------------
 
Wraps error messages with css markup according to the state of hidden.
 
]]
local function error_comment( content, hidden )
return substitute( hidden and cfg.presentation['hidden-error'] or cfg.presentation['visible-error'], content );
end
 
--[[--------------------------< S E T _ E R R O R >--------------------------------------------------------------
 
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.
 
]]
local function set_error( 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 in_array( 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 error_comment( message, error_state.hidden );
end
 
--[[--------------------------< A D D _ M A I N T _ C A T >------------------------------------------------------
 
Adds a category to z.maintenance_cats using names from the configuration file with additional text if any.
To prevent duplication, the added_maint_cats table lists the categories by key that have been added to z.maintenance_cats.
 
]]
 
local added_maint_cats = {} -- list of maintenance categories that have been added to z.maintenance_cats
local function add_maint_cat (key, arguments)
if not added_maint_cats [key] then
added_maint_cats [key] = true; -- note that we've added this category
table.insert( z.maintenance_cats, substitute (cfg.maint_cats [key], arguments)); -- make name then add to table
end
end
 
--[[--------------------------< A D D _ P R O P _ C A T >--------------------------------------------------------
 
Adds a category to z.properties_cats using names from the configuration file with additional text if any.
 
]]
 
local added_prop_cats = {} -- list of property categories that have been added to z.properties_cats
local function add_prop_cat (key, arguments)
if not added_prop_cats [key] then
added_prop_cats [key] = true; -- note that we've added this category
table.insert( z.properties_cats, substitute (cfg.prop_cats [key], arguments)); -- make name then add to table
end
end
 
--[[--------------------------< A D D _ V A N C _ E R R O R >----------------------------------------------------
 
Adds a single Vancouver system error message to the template's output regardless of how many error actually exist.
To prevent duplication, added_vanc_errs is nil until an error message is emitted.
 
]]
 
local added_vanc_errs; -- flag so we only emit one Vancouver error / category
local function add_vanc_error ()
if not added_vanc_errs then
added_vanc_errs = true; -- note that we've added this category
table.insert( z.message_tail, { set_error( 'vancouver', {}, true ) } );
end
end
 
--[[--------------------------< C H E C K _ U R L >------------------------------------------------------------
 
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.
 
]]
 
local function check_url( url_str )
return url_str:sub(1,2) == "//" or url_str:match( "^[^/]*:" ) ~= nil; -- Protocol-relative or URL scheme
end
 
--[[--------------------------< S A F E _ F O R _ I T A L I C S >----------------------------------------------
 
Protects a string that will be wrapped in wiki italic markup '' ... ''
 
Note: We cannot 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.
 
]]
 
local function safe_for_italics( str )
if not is_set(str) then
return str;
else
if str:sub(1,1) == "'" then str = "<span />" .. str; end
if str:sub(-1,-1) == "'" then str = str .. "<span />"; end
-- Remove newlines as they break italics.
return str:gsub( '\n', ' ' );
end
end
 
--[[--------------------------< S A F E _ F O R _ U R L >------------------------------------------------------
 
Escape sequences for content that will be used for URL descriptions
 
]]
 
local function safe_for_url( str )
if str:match( "%[%[.-%]%]" ) ~= nil then
table.insert( z.message_tail, { set_error( 'wikilink_in_url', {}, true ) } );
end
return str:gsub( '[%[%]\n]', {
['['] = '&#91;',
[']'] = '&#93;',
['\n'] = ' ' } );
end
 
--[[--------------------------< W R A P _ S T Y L E >----------------------------------------------------------
 
Applies styling to various parameters.  Supplied string is wrapped using a message_list configuration taking one
argument; protects italic styled parameters.  Additional text taken from citation_config.presentation - the reason
this function is similar to but separate from wrap_msg().
 
]]
 
local function wrap_style (key, str)
if not is_set( str ) then
return "";
elseif in_array( key, { 'italic-title', 'trans-italic-title' } ) then
str = safe_for_italics( str );
end
 
return substitute( cfg.presentation[key], {str} );
end
 
--[[--------------------------< E X T E R N A L _ L I N K >----------------------------------------------------
 
Format an external link with error checking
 
]]
 
local function external_link( URL, label, source )
local error_str = "";
if not is_set( label ) then
label = URL;
if is_set( source ) then
error_str = set_error( 'bare_url_missing_title', { wrap_style ('parameter', source) }, false, " " );
else
error( cfg.messages["bare_url_no_origin"] );
end
end
if not check_url( URL ) then
error_str = set_error( 'bad_url', {}, false, " " ) .. error_str;
end
return table.concat({ "[", URL, " ", safe_for_url( label ), "]", error_str });
end
 
--[[--------------------------< E X T E R N A L _ L I N K _ I D >----------------------------------------------
 
Formats a wiki style external link
 
]]
 
local function external_link_id(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 %s]',
options.link, options.label, options.separator or "&nbsp;",
options.prefix, url_string, options.suffix or "",
mw.text.nowiki(options.id)
);
end
 
--[[--------------------------< D E P R E C A T E D _ P A R A M E T E R >--------------------------------------
 
Categorize and emit an error message when the citation contains one or more deprecated parameters.  The function includes the
offending parameter name to the error message.  Only one error message is emitted regardless of the number of deprecated
parameters in the citation.
 
]]
 
local page_in_deprecated_cat; -- sticky flag so that the category is added only once
local function deprecated_parameter(name)
if not page_in_deprecated_cat then
page_in_deprecated_cat = true; -- note that we've added this category
table.insert( z.message_tail, { set_error( 'deprecated_params', {name}, true ) } ); -- add error message
end
end
 
--[[--------------------------< K E R N _ Q U O T E S >--------------------------------------------------------
 
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)
Double single quotes (italic or bold wikimarkup) are not kerned.
 
Call this function for chapter titles, for website titles, etc; not for book titles.
 
]]
 
local function kern_quotes (str)
local cap='';
local cap2='';
cap, cap2 = str:match ("^([\"\'])([^\'].+)"); -- match leading double or single quote but not double single quotes
if is_set (cap) then
str = substitute (cfg.presentation['kern-left'], {cap, cap2});
end
 
cap, cap2 = str:match ("^(.+[^\'])([\"\'])$")
if is_set (cap) then
str = substitute (cfg.presentation['kern-right'], {cap, cap2});
end
return str;
end
end


--[[--------------------------< F O R M A T _ S C R I P T _ V A L U E >----------------------------------------
-- First set variable or nil if none
 
function first_set(...)
|script-title= holds title parameters that are not written in Latin based scripts: Chinese, Japanese, Arabic, Hebrew, etc. These scripts should
    local list = {...};
not be italicized and may be written right-to-left. The value supplied by |script-title= is concatenated onto Title after Title has been wrapped
    for _, var in pairs(list) do
in italic markup.
        if is_set( var ) then
 
            return var;
Regardless of language, all values provided by |script-title= are wrapped in <bdi>...</bdi> tags to isolate rtl languages from the English left to right.
        end
 
    end
|script-title= provides a unique feature.  The value in |script-title= may be prefixed with a two-character ISO639-1 language code and a colon:
|script-title=ja:*** *** (where * represents a Japanese character)
Spaces between the two-character code and the colon and the colon and the first script character are allowed:
|script-title=ja : *** ***
|script-title=ja: *** ***
|script-title=ja :*** ***
Spaces preceding the prefix are allowed: |script-title = ja:*** ***
 
The prefix is checked for validity. If it is a valid ISO639-1 language code, the lang attribute (lang="ja") is added to the <bdi> tag so that browsers can
know the language the tag contains. This may help the browser render the script more correctly. If the prefix is invalid, the lang attribute
is not added.  At this time there is no error message for this condition.
 
At this writing, only |script-title= is supported.  It is anticipated that additional parameters will be created to use this function.
 
TODO: error messages when prefix is invalid ISO639-1 code; when script_value has prefix but no script;
]]
 
local function format_script_value (script_value)
local lang=''; -- initialize to empty string
local name;
if script_value:match('^%l%l%s*:') then -- if first 3 non-space characters are script language prefix
lang = script_value:match('^(%l%l)%s*:%s*%S.*'); -- get the language prefix or nil if there is no script
if not is_set (lang) then
return ''; -- script_value was just the prefix so return empty string
end
-- if we get this far we have prefix and script
name = mw.language.fetchLanguageName( lang, "en" ); -- get language name so that we can use it to categorize
if is_set (name) then -- is prefix a proper ISO 639-1 language code?
script_value = script_value:gsub ('^%l%l%s*:%s*', ''); -- strip prefix from script
-- is prefix one of these language codes?
if in_array (lang, {'ar', 'bg', 'bs', 'dv', 'el', 'fa', 'hy', 'ja', 'ka', 'ko', 'ku', 'he', 'ps', 'ru', 'sd', 'sr', 'th', 'uk', 'ug', 'yi', 'zh'}) then
add_prop_cat ('script_with_name', {name, lang})
else
add_prop_cat ('script')
end
lang = ' lang="' .. lang .. '" '; -- convert prefix into a lang attribute
else
lang = ''; -- invalid so set lang to empty string
end
end
script_value = substitute (cfg.presentation['bdi'], {lang, script_value}); -- isolate in case script is rtl
 
return script_value;
end
end


--[[--------------------------< S C R I P T _ C O N C A T E N A T E >------------------------------------------
-- Whether needle is in haystack
 
function inArray( needle, haystack )
Initially for |title= and |script-title=, this function concatenates those two parameter values after the script value has been
    if needle == nil then
wrapped in <bdi> tags.
        return false;
]]
    end
 
    for n,v in ipairs( haystack ) do
local function script_concatenate (title, script)
        if v == needle then
if is_set (script) then
            return n;
script = format_script_value (script); -- <bdi> tags, lang atribute, categorization, etc; returns empty string on error
        end
if is_set (script) then
    end
title = title .. ' ' .. script; -- concatenate title and script title
    return false;
end
end
return title;
end
end


 
-- Populates numbered arguments in a message string using an argument table.
--[[--------------------------< W R A P _ M S G >--------------------------------------------------------------
function substitute( msg, args )
 
    return args and tostring( mw.message.newRawMessage( msg, args ) ) or msg;
Applies additional message text to various parameter values. Supplied string is wrapped using a message_list
configuration taking one argument. Supports lower case text for {{citation}} templates.  Additional text taken
from citation_config.messages - the reason this function is similar to but separate from wrap_style().
 
]]
 
local function wrap_msg (key, str, lower)
if not is_set( str ) then
return "";
end
if true == lower then
local msg;
msg = cfg.messages[key]:lower(); -- set the message to lower case before
str = substitute( msg, {str} ); -- including template text
return str;
else
return substitute( cfg.messages[key], {str} );
end
end
 
--[[--------------------------< S E L E C T _ O N E >----------------------------------------------------------
 
Chooses one matching parameter from a list of parameters to consider
Generates an error if more than one match is present.
 
]]
 
local function select_one( 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_style ('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_style ('parameter', selected);
table.insert( z.message_tail, { set_error( error_condition, {error_str}, true ) } );
end
return value, selected;
end
end


--[[--------------------------< F O R M A T _ C H A P T E R _ T I T L E >--------------------------------------
-- Wraps a string using a message_list configuration taking one argument
 
function wrap( key, str, lower )
Format the three chapter parameters: |chapter=, |trans-chapter=, and |chapter-url= into a single Chapter meta-
    if not is_set( str ) then
parameter (chapter_url_source used for error messages).
        return "";
 
    elseif inArray( key, { 'italic-title', 'trans-italic-title' } ) then
]]
        str = safeforitalics( str );
 
    end
local function format_chapter_title (chapter, transchapter, chapterurl, chapter_url_source)
    if lower == true then
local chapter_error = '';
        return substitute( cfg.messages[key]:lower(), {str} );
    else
if not is_set (chapter) then
        return substitute( cfg.messages[key], {str} );
chapter = ''; -- just to be safe for concatenation
    end      
if is_set (transchapter) then
chapter = wrap_style ('trans-quoted-title', transchapter);
chapter_error = " " .. set_error ('trans_missing_chapter');
end
if is_set (chapterurl) then
chapter = external_link (chapterurl, chapter, chapter_url_source); -- adds bare_url_missing_title error if appropriate
end
return chapter .. chapter_error;
else -- here when chapter is set
chapter = kern_quotes (chapter); -- if necessary, separate chapter title's leading and trailing quote marks from Module provided quote marks
chapter = wrap_style ('quoted-title', chapter);
if is_set (transchapter) then
transchapter = wrap_style ('trans-quoted-title', transchapter);
chapter = chapter .. ' ' .. transchapter;
end
if is_set (chapterurl) then
chapter = external_link (chapterurl, chapter); -- adds bare_url_missing_title error if appropriate
end
end
return chapter;
end
end


سطر 506: سطر 63:
can be transparently aliased to single internal variable.
can be transparently aliased to single internal variable.
]]
]]
 
function argument_wrapper( args )
local function argument_wrapper( args )
    local origin = {};
local origin = {};
   
    return setmetatable({
return setmetatable({
        ORIGIN = function( self, k )
ORIGIN = function( self, k )
            local dummy = self[k]; --force the variable to be loaded.
local dummy = self[k]; --force the variable to be loaded.
            return origin[k];
return origin[k];
        end
end
    },
},
    {
{
        __index = function ( tbl, k )
__index = function ( tbl, k )
            if origin[k] ~= nil then
if origin[k] ~= nil then
                return nil;
return nil;
            end
end
           
            local args, list, v = args, cfg.aliases[k];
local args, list, v = args, cfg.aliases[k];
           
            if type( list ) == 'table' then
if type( list ) == 'table' then
                v, origin[k] = selectone( args, list, 'redundant_parameters' );
v, origin[k] = select_one( args, list, 'redundant_parameters' );
                if origin[k] == nil then
if origin[k] == nil then
                    origin[k] = ''; -- Empty string, not nil
origin[k] = ''; -- Empty string, not nil
                end
end
            elseif list ~= nil then
elseif list ~= nil then
                v, origin[k] = args[list], list;
v, origin[k] = args[list], list;
            else
else
                -- maybe let through instead of raising an error?
-- maybe let through instead of raising an error?
                -- v, origin[k] = args[k], k;
-- v, origin[k] = args[k], k;
      --        error( cfg.messages['unknown_argument_map'] );
error( cfg.messages['unknown_argument_map'] );
            end
end
           
            -- Empty strings, not nil;
-- Empty strings, not nil;
            if v == nil then
if v == nil then
                v = cfg.defaults[k] or '';
v = cfg.defaults[k] or '';
                origin[k] = '';
origin[k] = '';
            end
end
           
            tbl = rawset( tbl, k, v );
tbl = rawset( tbl, k, v );
            return v;
return v;
        end,
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
]]
 
local 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 (name); -- 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 (name); -- parameter is deprecated but still supported
return true;
end
return false; -- Not supported because not found or name is set to nil
end
end


 
-- Checks that parameter name is valid using the whitelist
-- Formats a wiki style internal link
function validate( name )
local function internal_link_id(options)
    name = tostring( name );
return mw.ustring.format( '[[%s|%s]]%s[[%s%s%s|%s]]',
   
options.link, options.label, options.separator or "&nbsp;",
    -- Normal arguments
options.prefix, options.id, options.suffix or "",
    if whitelist.basic_arguments[ name ] then
mw.text.nowiki(options.id)
        return true;
);
    end
   
    -- Arguments with numbers in them
    name = name:gsub( "%d+", "#" );
    if whitelist.numbered_arguments[ name ] then
        return true;
    end
   
    -- Not found, argument not supported.
    return false
end
end


 
-- Formats a comment for error trapping
--[[--------------------------< N O W R A P _ D A T E >--------------------------------------------------------
function errorcomment( content, hidden )
 
    return wrap( hidden and 'hidden-error' or 'visible-error', content );
When date is YYYY-MM-DD format wrap in nowrap span: <span ...>YYYY-MM-DD</span>.  When date is DD MMMM YYYY or is
MMMM DD, YYYY then wrap in nowrap span: <span ...>DD MMMM</span> YYYY or <span ...>MMMM DD,</span> YYYY
 
DOES NOT yet support MMMM YYYY or any of the date ranges.
 
]]
 
local function nowrap_date (date)
local cap='';
local cap2='';
 
if date:match("^%d%d%d%d%-%d%d%-%d%d$") then
date = substitute (cfg.presentation['nowrap1'], date);
elseif date:match("^%a+%s*%d%d?,%s*%d%d%d%d$") or date:match ("^%d%d?%s*%a+%s*%d%d%d%d$") then
cap, cap2 = string.match (date, "^(.*)%s+(%d%d%d%d)$");
date = substitute (cfg.presentation['nowrap2'], {cap, cap2});
end
return date;
end
end


--[[--------------------------< IS _ V A L I D _ I S X N >-----------------------------------------------------
--[[
 
Sets an error condition and returns the appropriate error message. The actual placement
ISBN-10 and ISSN validator code calculates checksum across all isbn/issn digits including the check digit. ISBN-13 is checked in check_isbn().
of the error message in the output is the responsibility of the calling function.
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 seterror( error_id, arguments, raw, prefix, suffix )
local function is_valid_isxn (isxn_str, len)
    local error_state = cfg.error_conditions[ error_id ];
local temp = 0;
   
isxn_str = { isxn_str:byte(1, len) }; -- make a table of byte values '0' → 0x30 .. '9'  → 0x39, 'X' → 0x58
    prefix = prefix or "";
len = len+1; -- adjust to be a loop counter
    suffix = suffix or "";
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 (compares the byte value of 'X' which is 0x58)
    if error_state == nil then
temp = temp + 10*( len - i ); -- it represents 10 decimal
        error( cfg.messages['undefined_error'] );
else
    elseif is_set( error_state.category ) then
temp = temp + tonumber( string.char(v) )*(len-i);
        table.insert( z.error_categories, error_state.category );
end
    end
end
   
return temp % 11 == 0; -- returns true if calculation result is zero
    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
end


 
-- Formats a wiki style external link
--[[--------------------------< IS _ V A L I D _ I S X N  _ 1 3 >----------------------------------------------
function externallinkid(options)
 
    local url_string = options.id;
ISBN-13 and ISMN validator code calculates checksum across all 13 isbn/ismn digits including the check digit.
    if options.encode == true or options.encode == nil then
If the number is valid, the result will be 0. Before calling this function, isbn-13/ismn must be checked for length
        url_string = mw.uri.encode( url_string );
and stripped of dashes, spaces and other non-isxn-13 characters.
    end
 
    return mw.ustring.format( '[[%s|%s]]%s[%s%s%s %s]',
]]
        options.link, options.label, options.separator or "&nbsp;",
 
        options.prefix, url_string, options.suffix or "",
local function is_valid_isxn_13 (isxn_str)
        mw.text.nowiki(options.id)
local temp=0;
    );
isxn_str = { isxn_str:byte(1, 13) }; -- make a table of byte values '0' → 0x30 .. '9'  → 0x39
for i, v in ipairs( isxn_str ) do
temp = temp + (3 - 2*(i % 2)) * tonumber( string.char(v) ); -- multiply odd index digits by 1, even index digits by 3 and sum; includes check digit
end
return temp % 10 == 0; -- sum modulo 10 is zero when isbn-13/ismn is correct
end
end


--[[--------------------------< C H E C K _ I S B N >------------------------------------------------------------
-- Formats a wiki style internal link
 
function internallinkid(options)
Determines whether an ISBN string is valid
    return mw.ustring.format( '[[%s|%s]]%s[[%s%s%s|%s]]',
 
        options.link, options.label, options.separator or "&nbsp;",
]]
        options.prefix, options.id, options.suffix or "",
 
        mw.text.nowiki(options.id)
local function check_isbn( 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; ismn begins with 979
return is_valid_isxn_13 (isbn_str);
end
end
 
--[[--------------------------< C H E C K _ I S M N >------------------------------------------------------------
 
Determines whether an ISMN string is valid.  Similar to isbn-13, ismn is 13 digits begining 979-0-... and uses the
same check digit calculations.  See http://www.ismn-international.org/download/Web_ISMN_Users_Manual_2008-6.pdf
section 2, pages 9–12.
 
]]
 
local function ismn (id)
local handler = cfg.id_handlers['ISMN'];
local text;
local valid_ismn = true;
 
id=id:gsub( "[%s-–]", "" ); -- strip spaces, hyphens, and endashes from the ismn
 
if 13 ~= id:len() or id:match( "^9790%d*$" ) == nil then -- ismn must be 13 digits and begin 9790
valid_ismn = false;
else
valid_ismn=is_valid_isxn_13 (id); -- validate ismn
end
 
-- text = internal_link_id({link = handler.link, label = handler.label, -- use this (or external version) when there is some place to link to
-- prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
text="[[" .. handler.link .. "|" .. handler.label .. "]]:" .. handler.separator .. id; -- because no place to link to yet
 
if false == valid_ismn then
text = text .. ' ' .. set_error( 'bad_ismn' ) -- add an error message if the issn is invalid
end
return text;
end
end


--[[--------------------------< I S S N >----------------------------------------------------------------------
-- Format an external link with error checking
 
function externallink( URL, label, source )
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
    local error_str = "";
digits with a space.  When that condition occurred, the resulting link looked like this:
    if not is_set( label ) then
 
        label = URL;
|issn=0819 4327 gives: [http://www.worldcat.org/issn/0819 4327 0819 4327]  -- can't have spaces in an external link
        if is_set( source ) then
            error_str = seterror( 'bare_url_missing_title', { wrap( 'parameter', source ) }, false, " " );
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
        else
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( cfg.messages["bare_url_no_origin"] );
error message.  The issn is always displayed with a hyphen, even if the issn was given as a single group of 8 digits.
        end          
 
    end
]]
    if not checkurl( URL ) then
 
        error_str = seterror( 'bad_url', {}, false, " " ) .. error_str;
local function issn(id)
    end
local issn_copy = id; -- save a copy of unadulterated issn; use this version for display if issn does not validate
    return table.concat({ "[", URL, " ", safeforurl( label ), "]", error_str });
local handler = cfg.id_handlers['ISSN'];
local text;
local valid_issn = true;
 
id=id:gsub( "[%s-–]", "" ); -- strip spaces, hyphens, and endashes from the issn
 
if 8 ~= id:len() or nil == id:match( "^%d*X?$" ) then -- validate the issn: 8 digits 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 = external_link_id({link = handler.link, label = handler.label,
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
if false == valid_issn then
text = text .. ' ' .. set_error( 'bad_issn' ) -- add an error message if the issn is invalid
end
return text
end
end


--[[--------------------------< A M A Z O N >------------------------------------------------------------------
-- Formats a link to Amazon
 
function amazon(id, domain)
Formats a link to Amazon.  Do simple error checking: asin must be mix of 10 numeric or uppercase alpha
    if not is_set(domain) then  
characters.  If a mix, first character must be uppercase alpha; if all numeric, asins must be 10-digit
        domain = "com"
isbn. If 10-digit isbn, add a maintenance category so a bot or awb script can replace |asin= with |isbn=.
    elseif ( "jp" == domain or "uk" == domain ) then
Error message if not 10 characters, if not isbn10, if mixed and first character is a digit.
        domain = "co." .. domain
 
    end
]]
    local handler = cfg.id_handlers['ASIN'];
 
    return externallinkid({link = handler.link,
local function amazon(id, domain)
        label=handler.label , prefix="//www.amazon."..domain.."/dp/",id=id,
local err_cat = ""
        encode=handler.encode, separator = handler.separator})
 
if not id:match("^[%d%u][%d%u][%d%u][%d%u][%d%u][%d%u][%d%u][%d%u][%d%u][%d%u]$") then
err_cat =  ' ' .. set_error ('bad_asin'); -- asin is not a mix of 10 uppercase alpha and numeric characters
else
if id:match("^%d%d%d%d%d%d%d%d%d[%dX]$") then -- if 10-digit numeric (or 9 digits with terminal X)
if check_isbn( id ) then -- see if asin value is isbn10
add_maint_cat ('ASIN');
elseif not is_set (err_cat) then
err_cat =  ' ' .. set_error ('bad_asin'); -- asin is not isbn10
end
elseif not id:match("^%u[%d%u]+$") then
err_cat =  ' ' .. set_error ('bad_asin'); -- asin doesn't begin with uppercase alpha
end
end
if not is_set(domain) then  
domain = "com";
elseif in_array (domain, {'jp', 'uk'}) then -- Japan, United Kingdom
domain = "co." .. domain;
elseif in_array (domain, {'au', 'br', 'mx'}) then -- Australia, Brazil, Mexico
domain = "com." .. domain;
end
local handler = cfg.id_handlers['ASIN'];
return external_link_id({link = handler.link,
label=handler.label , prefix="//www.amazon."..domain.."/dp/",id=id,
encode=handler.encode, separator = handler.separator}) .. err_cat;
end
end


--[[--------------------------< A R X I V >--------------------------------------------------------------------
-- Formats a DOI and checks for DOI errors.
 
function doi(id, inactive)
See: http://arxiv.org/help/arxiv_identifier
    local cat = ""
 
    local handler = cfg.id_handlers['DOI'];
format and error check arXiv identifier.  There are three valid forms of the identifier:
   
the first form, valid only between date codes 9108 and 0703 is:
    local text;
arXiv:<archive>.<class>/<date code><number><version>
    if is_set(inactive) then
where:
        text = "[[" .. handler.link .. "|" .. handler.label .. "]]:" .. id;
<archive> is a string of alpha characters - may be hyphenated; no other punctuation
        table.insert( z.error_categories, "Pages with DOIs inactive since " .. selectyear(inactive) );      
<class> is a string of alpha characters - may be hyphenated; no other punctuation
        inactive = " (" .. cfg.messages['inactive'] .. " " .. inactive .. ")"
<date code> is four digits in the form YYMM where YY is the last two digits of the four-digit year and MM is the month number January = 01
    else  
first digit of YY for this form can only 9 and 0
        text = externallinkid({link = handler.link, label = handler.label,
<number> is a three-digit number
            prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
<version> is a 1 or more digit number preceded with a lowercase v; no spaces (undocumented)
        inactive = ""
    end
the second form, valid from April 2007 through December 2014 is:
    if ( string.sub(id,1,3) ~= "10." ) then     
arXiv:<date code>.<number><version>
        cat = seterror( 'bad_doi' );
where:
    end
<date code> is four digits in the form YYMM where YY is the last two digits of the four-digit year and MM is the month number January = 01
    return text .. inactive .. cat
<number> is a four-digit number
<version> is a 1 or more digit number preceded with a lowercase v; no spaces
 
the third form, valid from January 2015 is:
arXiv:<date code>.<number><version>
where:
<date code> and <version> are as defined for 0704-1412
<number> is a five-digit number
]]
 
local function arxiv (id, class)
local handler = cfg.id_handlers['ARXIV'];
local year, month, version;
local err_cat = '';
local text;
if id:match("^%a[%a%.%-]+/[90]%d[01]%d%d%d%d$") or id:match("^%a[%a%.%-]+/[90]%d[01]%d%d%d%dv%d+$") then -- test for the 9108-0703 format w/ & w/o version
year, month = id:match("^%a[%a%.%-]+/([90]%d)([01]%d)%d%d%d[v%d]*$");
year = tonumber(year);
month = tonumber(month);
if ((not (90 < year or 8 > year)) or (1 > month or 12 < month)) or -- if invalid year or invalid month
((91 == year and 7 > month) or (7 == year and 3 < month)) then -- if years ok, are starting and ending months ok?
err_cat = ' ' .. set_error( 'bad_arxiv' ); -- set error message
end
elseif id:match("^%d%d[01]%d%.%d%d%d%d$") or id:match("^%d%d[01]%d%.%d%d%d%dv%d+$") then -- test for the 0704-1412 w/ & w/o version
year, month = id:match("^(%d%d)([01]%d)%.%d%d%d%d[v%d]*$");
year = tonumber(year);
month = tonumber(month);
if ((7 > year) or (14 < year) or (1 > month or 12 < month)) or -- is year invalid or is month invalid? (doesn't test for future years)
((7 == year) and (4 > month)) then --or -- when year is 07, is month invalid (before April)?
err_cat = ' ' .. set_error( 'bad_arxiv' ); -- set error message
end
elseif id:match("^%d%d[01]%d%.%d%d%d%d%d$") or id:match("^%d%d[01]%d%.%d%d%d%d%dv%d+$") then -- test for the 1501- format w/ & w/o version
year, month = id:match("^(%d%d)([01]%d)%.%d%d%d%d%d[v%d]*$");
year = tonumber(year);
month = tonumber(month);
if ((15 > year) or (1 > month or 12 < month)) then -- is year invalid or is month invalid? (doesn't test for future years)
err_cat = ' ' .. set_error( 'bad_arxiv' ); -- set error message
end
else
err_cat = ' ' .. set_error( 'bad_arxiv' ); -- arXiv id doesn't match any format
end
 
text = external_link_id({link = handler.link, label = handler.label,
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) .. err_cat;
 
if is_set (class) then
class = ' [[' .. '//arxiv.org/archive/' .. class .. ' ' .. class .. ']]'; -- external link within square brackets, not wikilink
else
class = ''; -- empty string for concatenation
end
return text .. class;
end
end


--[[
-- Formats an OpenLibrary link, and checks for associated errors.
lccn normalization (http://www.loc.gov/marc/lccn-namespace.html#normalization)
function openlibrary(id)
1. Remove all blanks.
    local code = id:sub(-1,-1)
2. If there is a forward slash (/) in the string, remove it, and remove all characters to the right of the forward slash.
    local handler = cfg.id_handlers['OL'];
3. If there is a hyphen in the string:
    if ( code == "A" ) then
a. Remove it.
        return externallinkid({link=handler.link, label=handler.label,
b. Inspect the substring following (to the right of) the (removed) hyphen. Then (and assuming that steps 1 and 2 have been carried out):
            prefix="http://openlibrary.org/authors/OL",id=id, separator=handler.separator,
1. All these characters should be digits, and there should be six or less. (not done in this function)
            encode = handler.encode})
2. If the length of the substring is less than 6, left-fill the substring with zeroes until the length is six.
    elseif ( code == "M" ) then
 
        return externallinkid({link=handler.link, label=handler.label,
Returns a normalized lccn for lccn() to validate.  There is no error checking (step 3.b.1) performed in this function.
            prefix="http://openlibrary.org/books/OL",id=id, separator=handler.separator,
]]
            encode = handler.encode})
 
    elseif ( code == "W" ) then
local function normalize_lccn (lccn)
        return externallinkid({link=handler.link, label=handler.label,
lccn = lccn:gsub ("%s", ""); -- 1. strip whitespace
            prefix= "http://openlibrary.org/works/OL",id=id, separator=handler.separator,
 
            encode = handler.encode})
if nil ~= string.find (lccn,'/') then
    else
lccn = lccn:match ("(.-)/"); -- 2. remove forward slash and all character to the right of it
        return externallinkid({link=handler.link, label=handler.label,
end
            prefix= "http://openlibrary.org/OL",id=id, separator=handler.separator,
 
            encode = handler.encode}) ..  
local prefix
            ' ' .. seterror( 'bad_ol' );
local suffix
    end
prefix, suffix = lccn:match ("(.+)%-(.+)"); -- 3.a remove hyphen by splitting the string into prefix and suffix
 
if nil ~= suffix then -- if there was a hyphen
suffix=string.rep("0", 6-string.len (suffix)) .. suffix; -- 3.b.2 left fill the suffix with 0s if suffix length less than 6
lccn=prefix..suffix; -- reassemble the lccn
end
return lccn;
end
 
--[[
Format LCCN link and do simple error checking. LCCN is a character string 8-12 characters long. The length of the LCCN dictates the character type of the first 1-3 characters; the
rightmost eight are always digits. http://info-uri.info/registry/OAIHandler?verb=GetRecord&metadataPrefix=reg&identifier=info:lccn/
 
length = 8 then all digits
length = 9 then lccn[1] is lower case alpha
length = 10 then lccn[1] and lccn[2] are both lower case alpha or both digits
length = 11 then lccn[1] is lower case alpha, lccn[2] and lccn[3] are both lower case alpha or both digits
length = 12 then lccn[1] and lccn[2] are both lower case alpha
 
]]
 
local function lccn(lccn)
local handler = cfg.id_handlers['LCCN'];
local err_cat =  ''; -- presume that LCCN is valid
local id = lccn; -- local copy of the lccn
 
id = normalize_lccn (id); -- get canonical form (no whitespace, hyphens, forward slashes)
local len = id:len(); -- get the length of the lccn
 
if 8 == len then
if id:match("[^%d]") then -- if LCCN has anything but digits (nil if only digits)
err_cat = ' ' .. set_error( 'bad_lccn' ); -- set an error message
end
elseif 9 == len then -- LCCN should be adddddddd
if nil == id:match("%l%d%d%d%d%d%d%d%d") then -- does it match our pattern?
err_cat = ' ' .. set_error( 'bad_lccn' ); -- set an error message
end
elseif 10 == len then -- LCCN should be aadddddddd or dddddddddd
if id:match("[^%d]") then -- if LCCN has anything but digits (nil if only digits) ...
if nil == id:match("^%l%l%d%d%d%d%d%d%d%d") then -- ... see if it matches our pattern
err_cat = ' ' .. set_error( 'bad_lccn' ); -- no match, set an error message
end
end
elseif 11 == len then -- LCCN should be aaadddddddd or adddddddddd
if not (id:match("^%l%l%l%d%d%d%d%d%d%d%d") or id:match("^%l%d%d%d%d%d%d%d%d%d%d")) then -- see if it matches one of our patterns
err_cat = ' ' .. set_error( 'bad_lccn' ); -- no match, set an error message
end
elseif 12 == len then -- LCCN should be aadddddddddd
if not id:match("^%l%l%d%d%d%d%d%d%d%d%d%d") then -- see if it matches our pattern
err_cat = ' ' .. set_error( 'bad_lccn' ); -- no match, set an error message
end
else
err_cat = ' ' .. set_error( 'bad_lccn' ); -- wrong length, set an error message
end
 
if not is_set (err_cat) and nil ~= lccn:find ('%s') then
err_cat = ' ' .. set_error( 'bad_lccn' ); -- lccn contains a space, set an error message
end
 
return external_link_id({link = handler.link, label = handler.label,
prefix=handler.prefix,id=lccn,separator=handler.separator, encode=handler.encode}) .. err_cat;
end
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
Determines whether an URL string is valid
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.
]]
 
local 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 = ' ' .. set_error( '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 = ' ' .. set_error( 'bad_pmid' ); -- set an error message
end
end
return external_link_id({link = handler.link, label = handler.label,
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) .. err_cat;
end
 
--[[--------------------------< I S _ E M B A R G O E D >------------------------------------------------------
 
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 the content of |embargo=; otherwise, returns and empty string because the embargo has expired or because
|embargo= was not set in this cite.


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 )
local function is_embargoed (embargo)
    -- Protocol-relative or URL scheme
if is_set (embargo) then
    return url_str:sub(1,2) == "//" or url_str:match( "^[^/]*:" ) ~= nil;
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 then -- if embargo date and today's date are good dates
if tonumber( embargo_date ) >= tonumber( todays_date ) then -- is embargo date is in the future?
return embargo; -- still embargoed
else
add_maint_cat ('embargo')
return ''; -- unset because embargo has expired
end
end
end
return ''; -- |embargo= not set return empty string
end
end


--[[--------------------------< P M C >------------------------------------------------------------------------
-- Removes irrelevant text and dashes from ISBN number
 
-- Similar to that used for Special:BookSources
Format a PMC, do simple error checking, and check for embargoed articles.
function cleanisbn( isbn_str )
 
    return isbn_str:gsub( "[^-0-9X]", "" );
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 date is today or 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.
 
PMC embargo date testing is done in function is_embargoed () which is called earlier because when the citation
has |pmc=<value> but does not have a |url= then |title= is linked with the PMC link.  Function is_embargoed ()
returns the embargo date if the PMC article is still embargoed, otherwise it returns an empty string.
 
PMCs are sequential numbers beginning at 1 and counting up.  This code checks the PMC 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 PMCs are issued.
 
]]
 
local function pmc(id, embargo)
local test_limit = 5000000; -- update this value as PMCs approach
local handler = cfg.id_handlers['PMC'];
local err_cat =  ''; -- presume that PMC is valid
local text;
 
if id:match("[^%d]") then -- if PMC has anything but digits
err_cat = ' ' .. set_error( 'bad_pmc' ); -- set an error message
else -- PMC 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 PMC is outside test limit boundaries
err_cat = ' ' .. set_error( 'bad_pmc' ); -- set an error message
end
end
if is_set (embargo) then -- is PMC is still embargoed?
text="[[" .. handler.link .. "|" .. handler.label .. "]]:" .. handler.separator .. id .. err_cat; -- still embargoed so no external link
else
text = external_link_id({link = handler.link, label = handler.label, -- no embargo date or embargo has expired, ok to link to article
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode}) .. err_cat;
end
return text;
end
end


-- Formats a DOI and checks for DOI errors.
-- Determines whether an ISBN string is valid
 
function checkisbn( isbn_str )
-- DOI names contain two parts: prefix and suffix separated by a forward slash.
    isbn_str = cleanisbn( isbn_str ):gsub( "-", "" );
--  Prefix: directory indicator '10.' followed by a registrant code
    local len = isbn_str:len();
--  Suffix: character string of any length chosen by the registrant
 
    if len ~= 10 and len ~= 13 then
-- This function checks a DOI name for: prefix/suffix.  If the doi name contains spaces or endashes,
        return false;
-- or, if it ends with a period or a comma, this function will emit a bad_doi error message.
    end
 
-- DOI names are case-insensitive and can incorporate any printable Unicode characters so the test for spaces, endash,
-- and terminal punctuation may not be technically correct but it appears, that in practice these characters are rarely if ever used in doi names.
 
local 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.link .. "|" .. 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 = external_link_id({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–]-/[^%s–]-[^%.,]$") then -- doi must begin with '10.', must contain a fwd slash, must not contain spaces or endashes, and must not end with period or comma
cat = ' ' .. set_error( 'bad_doi' );
end
return text .. inactive .. cat
end
 
-- Formats an OpenLibrary link, and checks for associated errors.
local function openlibrary(id)
local code = id:match("^%d+([AMW])$"); -- only digits followed by 'A', 'M', or 'W'
local handler = cfg.id_handlers['OL'];
 
if ( code == "A" ) then
return external_link_id({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 external_link_id({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 external_link_id({link=handler.link, label=handler.label,
prefix= "http://openlibrary.org/works/OL",id=id, separator=handler.separator,
encode = handler.encode})
else
return external_link_id({link=handler.link, label=handler.label,
prefix= "http://openlibrary.org/OL",id=id, separator=handler.separator,
encode = handler.encode}) ..
' ' .. set_error( 'bad_ol' );
end
end
 
 
--[[--------------------------< M E S S A G E _ I D >----------------------------------------------------------
 
Validate and format a usenet message id.  Simple error checking, looks for 'id-left@id-right' not enclosed in
'<' and/or '>' angle brackets.
 
]]
 
local function message_id (id)
local handler = cfg.id_handlers['USENETID'];
 
text = external_link_id({link = handler.link, label = handler.label,
prefix=handler.prefix,id=id,separator=handler.separator, encode=handler.encode})
   
   
if not id:match('^.+@.+$') or not id:match('^[^<].*[^>]$')then -- doesn't have '@' or has one or first or last character is '< or '>'
    local temp = 0;
text = text .. ' ' .. set_error( 'bad_message_id' ) -- add an error message if the message id is invalid
    if len == 10 then
end  
        if isbn_str:match( "^%d*X?$" ) == nil then return false; end
        isbn_str = { isbn_str:byte(1, len) };
return text
        for i, v in ipairs( isbn_str ) do
            if v == string.byte( "X" ) then
                temp = temp + 10*( 11 - i );
            else
                temp = temp + tonumber( string.char(v) )*(11-i);
            end
        end
        return temp % 11 == 0;
    else
        if isbn_str:match( "^%d*$" ) == 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


--[[--------------------------< S E T _ T I T L E T Y P E >----------------------------------------------------
-- Gets the display text for a wikilink like [[A|B]] or [[B]] gives B
 
function removewikilink( str )
This function sets default title types (equivalent to the citation including |type=<default value>) for those templates that have defaults.
    return (str:gsub( "%[%[([^%[%]]*)%]%]", function(l)
Also handles the special case where it is desirable to omit the title type from the rendered citation (|type=none).
        return l:gsub( "^[^|]*|(.*)$", "%1" ):gsub("^%s*(.-)%s*$", "%1");
 
    end));
]]
 
local 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
 
return cfg.title_types [cite_class] or ''; -- set template's default title type; else empty string for concatenation
end
end


--[[--------------------------< C L E A N _ I S B N >----------------------------------------------------------
-- Escape sequences for content that will be used for URL descriptions
 
function safeforurl( str )
Removes irrelevant text and dashes from ISBN number
    if str:match( "%[%[.-%]%]" ) ~= nil then
Similar to that used for Special:BookSources
        table.insert( z.message_tail, { seterror( 'wikilink_in_url', {}, true ) } );
 
    end
]]
   
 
    return str:gsub( '[%[%]\n]', {   
local function clean_isbn( isbn_str )
        ['['] = '&#91;',
return isbn_str:gsub( "[^-0-9X]", "" );
        [']'] = '&#93;',
        ['\n'] = ' ' } );
end
end


--[[--------------------------< E S C A P E _ L U A _ M A G I C _ C H A R S >----------------------------------
-- Converts a hyphen to a dash
 
function hyphentodash( str )
Returns a string where all of lua's magic characters have been escaped.  This is important because functions like
    if not is_set(str) or str:match( "[%[%]{}<>]" ) ~= nil then
string.gsub() treat their pattern and replace strings as patterns, not literal strings.
        return str;
]]
    end   
local function escape_lua_magic_chars (argument)
    return str:gsub( '-', '–' );
argument = argument:gsub("%%", "%%%%"); -- replace % with %%
argument = argument:gsub("([%^%$%(%)%.%[%]%*%+%-%?])", "%%%1"); -- replace all other lua magic pattern characters
return argument;
end
end


--[[--------------------------< S T R I P _ A P O S T R O P H E _ M A R K U P >--------------------------------
-- Protects a string that will be wrapped in wiki italic markup '' ... ''
 
function safeforitalics( str )
Strip wiki italic and bold markup from argument so that it doesn't contaminate COinS metadata.
    --[[ Note: We can not use <i> for italics, as the expected behavior for
This function strips common patterns of apostrophe markup.  We presume that editors who have taken the time to
    italics specified by ''...'' in the title is that they will be inverted
markup a title have, as a result, provided valid markup. When they don't, some single apostrophes are left behind.
    (i.e. unitalicized) in the resulting references.  In addition, <i> and ''
 
    tend to interact poorly under Mediawiki's HTML tidy. ]]
]]
   
 
    if not is_set(str) then
local function strip_apostrophe_markup (argument)
        return str;
if not is_set (argument) then return argument; end
    else
 
        if str:sub(1,1) == "'" then str = "<span />" .. str; end
while true do
        if str:sub(-1,-1) == "'" then str = str .. "<span />"; end
if argument:match ("%'%'%'%'%'") then -- bold italic (5)
       
argument=argument:gsub("%'%'%'%'%'", ""); -- remove all instances of it
        -- Remove newlines as they break italics.
elseif argument:match ("%'%'%'%'") then -- italic start and end without content (4)
        return str:gsub( '\n', ' ' );
argument=argument:gsub("%'%'%'%'", "");
    end
elseif argument:match ("%'%'%'") then -- bold (3)
argument=argument:gsub("%'%'%'", "");
elseif argument:match ("%'%'") then -- italic (2)
argument=argument:gsub("%'%'", "");
else
break;
end
end
return argument; -- done
end
end


--[[--------------------------< M A K E _ C O I N S _ T I T L E >----------------------------------------------
--[[
 
Joins a sequence of strings together while checking for duplicate separation
Makes a title for COinS from Title and / or ScriptTitle (or any other name-script pairs)
characters.
 
Apostrophe markup (bold, italics) is stripped from each value so that the COinS metadata isn't correupted with strings
of %27%27...
]]
]]
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


local function make_coins_title (title, script)
                if trim then
if is_set (title) then
                    if value ~= comp then  
title = strip_apostrophe_markup (title); -- strip any apostrophe markup
                        local dup2 = duplicate_char;
else
                        if dup2:match( "%A" ) then dup2 = "%" .. dup2; end
title=''; -- if not set, make sure title is an empty string
                       
end
                        value = value:gsub( "(%b<>)" .. dup2, "%1", 1 )
if is_set (script) then
                    else
script = script:gsub ('^%l%l%s*:%s*', ''); -- remove language prefix if present (script value may now be empty string)
                        value = value:sub( 2, -1 );
script = strip_apostrophe_markup (script); -- strip any apostrophe markup
                    end
else
                end
script=''; -- if not set, make sure script is an empty string
            end
end
            str = str .. value;
if is_set (title) and is_set (script) then
        end
script = ' ' .. script; -- add a space before we concatenate
    end
end
    return str;
return title .. script; -- return the concatenation
end
 
--[[--------------------------< G E T _ C O I N S _ P A G E S >------------------------------------------------
 
Extract page numbers from external wikilinks in any of the |page=, |pages=, or |at= parameters for use in COinS.
 
]]
 
local function get_coins_pages (pages)
local pattern;
if not is_set (pages) then return pages; end -- if no page numbers then we're done
while true do
pattern = pages:match("%[(%w*:?//[^ ]+%s+)[%w%d].*%]"); -- pattern is the opening bracket, the url and following space(s): "[url "
if nil == pattern then break; end -- no more urls
pattern = escape_lua_magic_chars (pattern); -- pattern is not a literal string; escape lua's magic pattern characters
pages = pages:gsub(pattern, ""); -- remove as many instances of pattern as possible
end
pages = pages:gsub("[%[%]]", ""); -- remove the brackets
pages = pages:gsub("–", "-" ); -- replace endashes with hyphens
pages = pages:gsub("&%w+;", "-" ); -- and replace html entities (&ndash; etc.) with hyphens; do we need to replace numerical entities like &#32; and the like?
return pages;
end
 
-- Gets the display text for a wikilink like [[A|B]] or [[B]] gives B
local function remove_wiki_link( str )
return (str:gsub( "%[%[([^%[%]]*)%]%]", function(l)
return l:gsub( "^[^|]*|(.*)$", "%1" ):gsub("^%s*(.-)%s*$", "%1");
end));
end
 
-- Converts a hyphen to a dash
local function hyphen_to_dash( str )
if not is_set(str) or str:match( "[%[%]{}<>]" ) ~= nil then
return str;
end
return str:gsub( '-', '–' );
end
 
--[[--------------------------< S A F E _ J O I N >------------------------------------------------------------
 
Joins a sequence of strings together while checking for duplicate separation characters.
 
]]
 
local function safe_join( 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 = ''; -- the output string
local comp = ''; -- what does 'comp' mean?
local end_chr = '';
local trim;
for _, value in ipairs( tbl ) do
if value == nil then value = ''; end
if str == '' then -- if output string is empty
str = value; -- assign value to it (first time through the loop)
elseif value ~= '' then
if value:sub(1,1) == '<' then -- Special case of values enclosed in spans and other markup.
comp = value:gsub( "%b<>", "" ); -- remove html markup (<span>string</span> -> string)
else
comp = value;
end
-- typically duplicate_char is sepc
if comp:sub(1,1) == duplicate_char then -- is first charactier same as duplicate_char? why test first character?
--  Because individual string segments often (always?) begin with terminal punct for th
--  preceding segment: 'First element' .. 'sepc next element' .. etc?
trim = false;
end_chr = str:sub(-1,-1); -- get the last character of the output string
-- str = str .. "<HERE(enchr=" .. end_chr.. ")" -- debug stuff?
if end_chr == duplicate_char then -- if same as separator
str = str:sub(1,-2); -- remove it
elseif end_chr == "'" then -- if it might be wikimarkup
if str:sub(-3,-1) == duplicate_char .. "''" then -- if last three chars of str are sepc''
str = str:sub(1, -4) .. "''"; -- remove them and add back ''
elseif str:sub(-5,-1) == duplicate_char .. "]]''" then -- if last five chars of str are sepc]]''
trim = true; -- why? why do this and next differently from previous?
elseif str:sub(-4,-1) == duplicate_char .. "]''" then -- if last four chars of str are sepc]''
trim = true; -- same question
end
elseif end_chr == "]" then -- if it might be wikimarkup
if str:sub(-3,-1) == duplicate_char .. "]]" then -- if last three chars of str are sepc]] wikilink
trim = true;
elseif str:sub(-2,-1) == duplicate_char .. "]" then -- if last two chars of str are sepc] external link
trim = true;
elseif str:sub(-4,-1) == duplicate_char .. "'']" then -- normal case when |url=something & |title=Title.
trim = true;
end
elseif end_chr == " " then -- if last char of output string is a space
if str:sub(-2,-1) == duplicate_char .. " " then -- if last two chars of str are <sepc><space>
str = str:sub(1,-3); -- remove them both
end
end
 
if trim then
if value ~= comp then -- value does not equal comp when value contains html markup
local dup2 = duplicate_char;
if dup2:match( "%A" ) then dup2 = "%" .. dup2; end -- if duplicate_char not a letter then escape it
value = value:gsub( "(%b<>)" .. dup2, "%1", 1 ) -- remove duplicate_char if it follows html markup
else
value = value:sub( 2, -1 ); -- remove duplicate_char when it is first character
end
end
end
str = str .. value; --add it to the output string
end
end
return str;
end   
end   


--[[--------------------------< I S _ G O O D _ V A N C _ N A M E >--------------------------------------------
--[[
 
Return the year portion of a date string, if possible.
For Vancouver Style, author/editor names are supposed to be rendered in Latin (read ASCII) characters.  When a name
Returns empty string if the argument can not be interpreted
uses characters that contain diacritical marks, those characters are to converted to the corresponding Latin character.
as a year.
When a name is written using a non-Latin alphabet or logogram, that name is to be transliterated into Latin characters.
These things are not currently possible in this module so are left to the editor to do.
 
This test allows |first= and |last= names to contain any of the letters defined in the four Unicode Latin character sets
[http://www.unicode.org/charts/PDF/U0000.pdf C0 Controls and Basic Latin] 0041–005A, 0061–007A
[http://www.unicode.org/charts/PDF/U0080.pdf C1 Controls and Latin-1 Supplement] 00C0–00D6, 00D8–00F6, 00F8–00FF
[http://www.unicode.org/charts/PDF/U0100.pdf Latin Extended-A] 0100–017F
[http://www.unicode.org/charts/PDF/U0180.pdf Latin Extended-B] 0180–01BF, 01C4–024F
 
|lastn= also allowed to contain hyphens, spaces, and apostrophes. (http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35029/)
|firstn= also allowed to contain hyphens, spaces, apostrophes, and periods
 
At the time of this writing, I had to write the 'if nil == mw.ustring.find ...' test ouside of the code editor and paste it here
because the code editor gets confused between character insertion point and cursor position.
 
]]
 
local function is_good_vanc_name (last, first)
if nil == mw.ustring.find (last, "^[A-Za-zÀ-ÖØ-öø-ƿDŽ-ɏ%-%s%']*$") or nil == mw.ustring.find (first, "^[A-Za-zÀ-ÖØ-öø-ƿDŽ-ɏ%-%s%'%.]*$") then
add_vanc_error ();
return false; -- not a string of latin characters; Vancouver required Romanization
end;
return true;
end
 
--[[--------------------------< R E D U C E _ T O _ I N I T I A L S >------------------------------------------
 
Attempts to convert names to initials in support of |name-list-format=vanc. 
 
Names in |firstn= may be separated by spaces or hyphens, or for initials, a period. See http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35062/.
 
Vancouver style requires family rank designations (Jr, II, III, etc) to be rendered as Jr, 2nd, 3rd, etc. This form is not
currently supported by this code so correctly formed names like Smith JL 2nd are converted to Smith J2. See http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35085/.
 
This function uses ustring functions because firstname initials may be any of the unicode Latin characters accepted by is_good_vanc_name ().
 
]]
]]
 
function selectyear( str )
local function reduce_to_initials(first)
    -- Is the input a simple number?
if mw.ustring.match(first, "^%u%u$") then return first end; -- when first contains just two upper-case letters, nothing to do
    local num = tonumber( str );
local initials = {}
    if num ~= nil and num > 0 and num < 2100 and num == math.floor(num) then
local i = 0; -- counter for number of initials
        return str;
for word in mw.ustring.gmatch(first, "[^%s%.%-]+") do -- names separated by spaces, hyphens, or periods
    else
table.insert(initials, mw.ustring.sub(word,1,1)) -- Vancouver format does not include full stops.
        -- Use formatDate to interpret more complicated formats
i = i + 1; -- bump the counter
        local lang = mw.getContentLanguage();
if 2 <= i then break; end -- only two initials allowed in Vancouver system; if 2, quit
        local good, result;
end
        good, result = pcall( lang.formatDate, lang, 'Y', str )
return table.concat(initials) -- Vancouver format does not include spaces.
        if good then  
            return result;
        else
            -- Can't make sense of this input, return blank.
            return "";
        end
    end
end
end


--[[--------------------------< L I S T  _ P E O P L E >-------------------------------------------------------
-- Attempts to convert names to initials.
 
function reducetoinitials(first)
Formats a list of people (e.g. authors / editors)
    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
local function list_people(control, people, etal)
    return table.concat(initials) -- Vancouver format does not include spaces.
local sep;
local namesep;
local format = control.format
local maximum = control.maximum
local lastauthoramp = control.lastauthoramp;
local text = {}
 
if 'vanc' == format then -- Vancouver-like author/editor name styling?
sep = ','; -- name-list separator between authors is a comma
namesep = ' '; -- last/first separator is a space
else
sep = ';' -- name-list separator between authors is a semicolon
namesep = ', ' -- last/first separator is <comma><space>
end
if sep:sub(-1,-1) ~= " " then sep = sep .. " " end
if is_set (maximum) and maximum < 1 then return "", 0; end -- returned 0 is for EditorCount; not used for authors
for i,person in ipairs(people) do
if is_set(person.last) then
local mask = person.mask
local one
local sep_one = sep;
if is_set (maximum) and i > maximum then
etal = true;
break;
elseif (mask ~= nil) then
local n = tonumber(mask)
if (n ~= nil) then
one = string.rep("&mdash;",n)
else
one = mask;
sep_one = " ";
end
else
one = person.last
local first = person.first
if is_set(first) then
if ( "vanc" == format ) then -- if vancouver format
one = one:gsub ('%.', ''); -- remove periods from surnames (http://www.ncbi.nlm.nih.gov/books/NBK7271/box/A35029/)
if not person.corporate and is_good_vanc_name (one, first) then -- and name is all Latin characters; corporate authors not tested
first = reduce_to_initials(first) -- attempt to convert first name(s) to initials
end
end
one = one .. namesep .. first
end
if is_set(person.link) and person.link ~= control.page_name then
one = "[[" .. person.link .. "|" .. one .. "]]" -- link author/editor if this page is not the author's/editor's page
end
 
if is_set(person.link) and ((nil ~= person.link:find("//")) or (nil ~= person.link:find("[%[%]]"))) then
one = one .. " " .. set_error( 'bad_authorlink' ) end -- url or wikilink in author link;
end
table.insert( text, one )
table.insert( text, sep_one )
end
end
 
local count = #text / 2; -- (number of names + number of separators) divided by 2
if count > 0 then
if count > 1 and is_set(lastauthoramp) and not etal then
text[#text-2] = " & "; -- replace last separator with ampersand text
end
text[#text] = nil; -- erase the last separator
end
local result = table.concat(text) -- construct list
if etal and is_set (result) then -- etal may be set by |display-authors=etal but we might not have a last-first list
result = result .. ' ' .. cfg.messages['et al']; -- we've go a last-first list and etal so add et al.
end
return result, count
end
end


--[[--------------------------< A N C H O R _ I D >------------------------------------------------------------
-- Formats a list of people (e.g. authors / editors)
 
function listpeople(control, people)
Generates a CITEREF anchor ID if we have at least one name or a date. Otherwise returns an empty string.
    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("&mdash;",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 = "[[" .. person.link .. "|" .. one .. "]]" end
            end
            table.insert( text, one )
            table.insert( text, sep_one )
        end
    end


local function anchor_id( options )
    local count = #text / 2;
local id = table.concat( options ); -- concatenate names and year for CITEREF id
    if count > 0 then
if is_set (id) then -- if concatenation is not an empty string
        if count > 1 and is_set(lastauthoramp) and not etal then
return "CITEREF" .. id; -- add the CITEREF portion
            text[#text-2] = " & ";
else
        end
return ''; -- return an empty string; no reason to include CITEREF id in this citation
        text[#text] = nil;
end
    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 <span> tag to format in Small Caps
    if ( "scap" == format ) then result =
        '<span class="smallcaps" style="font-variant:small-caps">' .. result .. '</span>';
    end  
    return result, count
end
end


--[[--------------------------< N A M E _ H A S _ E T A L >----------------------------------------------------
-- Generates a CITEREF anchor ID.
 
function anchorid( options )
Evaluates the content of author and editor name parameters for variations on the theme eof et al.  If found,
    return "CITEREF" .. table.concat( options );
the et al. is removed, a flag is set to true and the function returns the modified name and the flag.
 
This function never sets the flag to false but returns it's previous state because it may have been set by
previous passes through this function or by the parameters |display-authors=etal or |displayeditors=etal
 
]]
 
local function name_has_etal (name, etal, nocat)
 
if is_set (name) then -- name can be nil in which case just return
local pattern = "[;,]? *[\"']*%f[Ee][Ee][Tt] *[Aa][Ll][%.\"']*$" -- variations on the 'et al' theme
if name:match (pattern) then -- variants on et al.
name = name:gsub (pattern, ''); -- if found, remove
etal = true; -- set flag (may have been set previously here or by |display-authors=etal)
if not nocat then -- no categorization for |vauthors=
add_maint_cat ('etal'); -- and add a category if not already added
end
end
end
return name, etal; --
end
end


--[[--------------------------< E X T R A C T _ N A M E S >----------------------------------------------------
-- Gets name list from the input arguments
Gets name list from the input arguments
function extractnames(args, list_name)
 
    local names = {};
Searches through args in sequential order to find |lastn= and |firstn= parameters (or their aliases), and their matching link and mask parameters.
    local i = 1;
Stops searching when both |lastn= and |firstn= are not found in args after two sequential attempts: found |last1=, |last2=, and |last3= but doesn't
    local last;
find |last4= and |last5= then the search is done.
   
 
    while true do
This function emits an error message when there is a |firstn= without a matching |lastn=.  When there are 'holes' in the list of last names, |last1= and |last3=
        last = selectone( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', i );
are present but |last2= is missing, an error message is emitted. |lastn= is not required to have a matching |firstn=.
        if not is_set(last) then
 
            -- just in case someone passed in an empty parameter
When an author or editor parameter contains some form of 'et al.', the 'et al.' is stripped from the parameter and a flag (etal) returned
            break;
that will cause list_people() to add the static 'et al.' text from Module:Citation/CS1/Configuration.  This keeps 'et al.' out of the
        end
template's metadata.  When this occurs, the page is added to a maintenance category.
        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 ),
local function extract_names(args, list_name)
            mask = selectone( args, cfg.aliases[list_name .. '-Mask'], 'redundant_parameters', i )
local names = {}; -- table of names
        };
local last; -- individual name components
        i = i + 1;
local first;
    end
local link;
    return names;
local mask;
local i = 1; -- loop counter/indexer
local n = 1; -- output table indexer
local count = 0; -- used to count the number of times we haven't found a |last= (or alias for authors, |editor-last or alias for editors)
local etal=false; -- return value set to true when we find some form of et al. in an author parameter
 
local err_msg_list_name = list_name:match ("(%w+)List") .. 's list'; -- modify AuthorList or EditorList for use in error messages if necessary
 
while true do
last = select_one( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', i ); -- search through args for name components beginning at 1
first = select_one( args, cfg.aliases[list_name .. '-First'], 'redundant_parameters', i );
link = select_one( args, cfg.aliases[list_name .. '-Link'], 'redundant_parameters', i );
mask = select_one( args, cfg.aliases[list_name .. '-Mask'], 'redundant_parameters', i );
 
last, etal = name_has_etal (last, etal, false); -- find and remove variations on et al.
first, etal = name_has_etal (first, etal, false); -- find and remove variations on et al.
 
if first and not last then -- if there is a firstn without a matching lastn
table.insert( z.message_tail, { set_error( 'first_missing_last', {err_msg_list_name, i}, true ) } ); -- add this error message
elseif not first and not last then -- if both firstn and lastn aren't found, are we done?
count = count + 1; -- number of times we haven't found last and first
if 2 <= count then -- two missing names and we give up
break; -- normal exit or there is a two-name hole in the list; can't tell which
end
else -- we have last with or without a first
names[n] = {last = last, first = first, link = link, mask = mask, corporate=false}; -- add this name to our names list (corporate for |vauthors= only)
n = n + 1; -- point to next location in the names table
if 1 == count then -- if the previous name was missing
table.insert( z.message_tail, { set_error( 'missing_name', {err_msg_list_name, i-1}, true ) } ); -- add this error message
end
count = 0; -- reset the counter, we're looking for two consecutive missing names
end
i = i + 1; -- point to next args location
end
return names, etal; -- all done, return our list of names
end
end


-- Populates ID table from arguments using configuration settings
-- Populates ID table from arguments using configuration settings
local function extract_ids( args )
function extractids( args )
local id_list = {};
    local id_list = {};
for k, v in pairs( cfg.id_handlers ) do
    for k, v in pairs( cfg.id_handlers ) do  
v = select_one( args, v.parameters, 'redundant_parameters' );
        v = selectone( args, v.parameters, 'redundant_parameters' );
if is_set(v) then id_list[k] = v; end
        if is_set(v) then id_list[k] = v; end
end
    end
return id_list;
    return id_list;
end
end


--[[--------------------------< B U I L D _ I D _ L I S T >--------------------------------------------------------
-- Takes a table of IDs and turns it into a table of formatted ID outputs.
 
function buildidlist( id_list, options )
Takes a table of IDs and turns it into a table of formatted ID outputs.
    local new_list, handler = {};
 
   
]]
    function fallback(k) return { __index = function(t,i) return cfg.id_handlers[k][i] end } end;
 
   
local function build_id_list( id_list, options )
    for k, v in pairs( id_list ) do
local new_list, handler = {};
        -- fallback to read-only cfg
 
        handler = setmetatable( { ['id'] = v }, fallback(k) );
function fallback(k) return { __index = function(t,i) return cfg.id_handlers[k][i] end } end;
       
        if handler.mode == 'external' then
for k, v in pairs( id_list ) do
            table.insert( new_list, {handler.label, externallinkid( handler ) } );
-- fallback to read-only cfg
        elseif handler.mode == 'internal' then
handler = setmetatable( { ['id'] = v }, fallback(k) );
            table.insert( new_list, {handler.label, internallinkid( handler ) } );
        elseif handler.mode ~= 'manual' then
if handler.mode == 'external' then
            error( cfg.messages['unknown_ID_mode'] );
table.insert( new_list, {handler.label, external_link_id( handler ) } );
        elseif k == 'DOI' then
elseif handler.mode == 'internal' then
            table.insert( new_list, {handler.label, doi( v, options.DoiBroken ) } );
table.insert( new_list, {handler.label, internal_link_id( handler ) } );
        elseif k == 'ASIN' then
elseif handler.mode ~= 'manual' then
            table.insert( new_list, {handler.label, amazon( v, options.ASINTLD ) } );  
error( cfg.messages['unknown_ID_mode'] );
        elseif k == 'OL' then
elseif k == 'DOI' then
            table.insert( new_list, {handler.label, openlibrary( v ) } );
table.insert( new_list, {handler.label, doi( v, options.DoiBroken ) } );
        elseif k == 'ISBN' then
elseif k == 'ARXIV' then
            local ISBN = internallinkid( handler );
table.insert( new_list, {handler.label, arxiv( v, options.Class ) } );
            if not checkisbn( v ) and not is_set(options.IgnoreISBN) then
elseif k == 'ASIN' then
                ISBN = ISBN .. seterror( 'bad_isbn', {}, false, " ", "" );
table.insert( new_list, {handler.label, amazon( v, options.ASINTLD ) } );  
            end
elseif k == 'LCCN' then
            table.insert( new_list, {handler.label, ISBN } );              
table.insert( new_list, {handler.label, lccn( v ) } );
        else
elseif k == 'OL' then
            error( cfg.messages['unknown_manual_ID'] );
table.insert( new_list, {handler.label, openlibrary( v ) } );
        end
elseif k == 'PMC' then
    end
table.insert( new_list, {handler.label, pmc( v, options.Embargo ) } );
   
elseif k == 'PMID' then
    function comp( a, b )
table.insert( new_list, {handler.label, pmid( v ) } );
        return a[1] < b[1];
elseif k == 'ISMN' then
    end
table.insert( new_list, {handler.label, ismn( v ) } );
   
elseif k == 'ISSN' then
    table.sort( new_list, comp );
table.insert( new_list, {handler.label, issn( v ) } );
    for k, v in ipairs( new_list ) do
elseif k == 'ISBN' then
        new_list[k] = v[2];
local ISBN = internal_link_id( handler );
    end
if not check_isbn( v ) and not is_set(options.IgnoreISBN) then
   
ISBN = ISBN .. set_error( 'bad_isbn', {}, false, " ", "" );
    return new_list;
end
table.insert( new_list, {handler.label, ISBN } );
elseif k == 'USENETID' then
table.insert( new_list, {handler.label, message_id( v ) } );
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
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
-- COinS metadata (see <http://ocoins.info/>) allows automated tools to parse
-- the citation information.
-- the citation information.
local function COinS(data, class)
function COinS(data)
if 'table' ~= type(data) or nil == next(data) then
    if 'table' ~= type(data) or nil == next(data) then
return '';
        return '';
end
    end
   
local ctx_ver = "Z39.88-2004";
    local ctx_ver = "Z39.88-2004";
   
-- treat table strictly as an array with only set values.
    -- treat table strictly as an array with only set values.
local OCinSoutput = setmetatable( {}, {
    local OCinSoutput = setmetatable( {}, {
__newindex = function(self, key, value)
        __newindex = function(self, key, value)
if is_set(value) then
            if is_set(value) then
rawset( self, #self+1, table.concat{ key, '=', mw.uri.encode( remove_wiki_link( value ) ) } );
                rawset( self, #self+1, table.concat{ key, '=', mw.uri.encode( removewikilink( value ) ) } );
end
            end
end
        end
});
    });
   
if is_set(data.Chapter) then
    if is_set(data.Chapter) then
OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
        OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
OCinSoutput["rft.genre"] = "bookitem";
        OCinSoutput["rft.genre"] = "bookitem";
OCinSoutput["rft.atitle"] = data.Chapter;
        OCinSoutput["rft.btitle"] = data.Chapter;
OCinSoutput["rft.btitle"] = data.Title;
        OCinSoutput["rft.atitle"] = data.Title;
elseif is_set(data.Periodical) then
    elseif is_set(data.Periodical) then
OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:journal";
        OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:journal";
if 'arxiv' == class then
        OCinSoutput["rft.genre"] = "article";
OCinSoutput["rft.genre"] = "preprint"; -- cite arxiv
        OCinSoutput["rft.jtitle"] = data.Periodical;
else
        OCinSoutput["rft.atitle"] = data.Title;
OCinSoutput["rft.genre"] = "article";
    else
end
        OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
OCinSoutput["rft.jtitle"] = data.Periodical;
        OCinSoutput["rft.genre"] = "book"
OCinSoutput["rft.atitle"] = data.Title;
        OCinSoutput["rft.btitle"] = data.Title;
else
    end
OCinSoutput.rft_val_fmt = "info:ofi/fmt:kev:mtx:book";
   
OCinSoutput["rft.genre"] = "book"
    OCinSoutput["rft.place"] = data.PublicationPlace;
OCinSoutput["rft.btitle"] = data.Title;
    OCinSoutput["rft.date"] = data.Date;
end
    OCinSoutput["rft.series"] = data.Series;
    OCinSoutput["rft.volume"] = data.Volume;
OCinSoutput["rft.place"] = data.PublicationPlace;
    OCinSoutput["rft.issue"] = data.Issue;
OCinSoutput["rft.date"] = data.Date;
    OCinSoutput["rft.pages"] = data.Pages;
OCinSoutput["rft.series"] = data.Series;
    OCinSoutput["rft.edition"] = data.Edition;
OCinSoutput["rft.volume"] = data.Volume;
    OCinSoutput["rft.pub"] = data.PublisherName;
OCinSoutput["rft.issue"] = data.Issue;
   
OCinSoutput["rft.pages"] = data.Pages;
    for k, v in pairs( data.ID_list ) do
OCinSoutput["rft.edition"] = data.Edition;
        local id, value = cfg.id_handlers[k].COinS;
OCinSoutput["rft.pub"] = data.PublisherName;
        if k == 'ISBN' then value = cleanisbn( v ); else value = v; end
        if string.sub( id or "", 1, 4 ) == 'info' then
for k, v in pairs( data.ID_list ) do
            OCinSoutput["rft_id"] = table.concat{ id, "/", v };
local id, value = cfg.id_handlers[k].COinS;
        else
if k == 'ISBN' then value = clean_isbn( v ); else value = v; end
            OCinSoutput[ id ] = value;
if string.sub( id or "", 1, 4 ) == 'info' then
        end
OCinSoutput["rft_id"] = table.concat{ id, "/", v };
    end
else
   
OCinSoutput[ id ] = value;
    local last, first;
end
    for k, v in ipairs( data.Authors ) do
end
        last, first = v.last, v.first;
        if k == 1 then
local last, first;
            if is_set(last) then
for k, v in ipairs( data.Authors ) do
                OCinSoutput["rft.aulast"] = last;
last, first = v.last, v.first;
            end
if k == 1 then
            if is_set(first) then  
if is_set(last) then
                OCinSoutput["rft.aufirst"] = first;
OCinSoutput["rft.aulast"] = last;
            end
end
        end
if is_set(first) then  
        if is_set(last) and is_set(first) then
OCinSoutput["rft.aufirst"] = first;
            OCinSoutput["rft.au"] = table.concat{ last, ", ", first };
end
        elseif is_set(last) then
end
            OCinSoutput["rft.au"] = last;
if is_set(last) and is_set(first) then
        end
OCinSoutput["rft.au"] = table.concat{ last, ", ", first };
    end
elseif is_set(last) then
   
OCinSoutput["rft.au"] = last;
    OCinSoutput.rft_id = data.URL;
end
    OCinSoutput.rfr_id = table.concat{ "info:sid/", mw.site.server:match( "[^/]*$" ), ":", data.RawPage };
end
    OCinSoutput = setmetatable( OCinSoutput, nil );
   
OCinSoutput.rft_id = data.URL;
    -- sort with version string always first, and combine.
OCinSoutput.rfr_id = table.concat{ "info:sid/", mw.site.server:match( "[^/]*$" ), ":", data.RawPage };
    table.sort( OCinSoutput );
OCinSoutput = setmetatable( OCinSoutput, nil );
    table.insert( OCinSoutput, 1, "ctx_ver=" .. ctx_ver );  -- such as "Z39.88-2004"
    return table.concat(OCinSoutput, "&");
-- 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
 
 
--[[--------------------------< G E T _ I S O 6 3 9 _ C O D E >------------------------------------------------
 
Validates language names provided in |language= parameter if not an ISO639-1 code.  Handles the special case that is Norwegian where
ISO639-1 code 'no' is mapped to language name 'Norwegian Bokmål' by Extention:CLDR.
 
Returns the language name and associated ISO639-1 code.  Because case of the source may be incorrect or different from the case that Wikimedia
uses, the name comparisons are done in lower case and when a match is found, the Wikimedia version (assumed to be correct) is returned along
with the code.  When there is no match, we return the original language name string.
 
mw.language.fetchLanguageNames() will return a list of languages that aren't part of ISO639-1. Names that aren't ISO639-1 but that are included
in the list will be found if that name is provided in the |language= parameter.  For example, if |language=Samaritan Aramaic, that name will be
found with the associated code 'sam', not an ISO639-1 code.  When names are found and the associated code is not two characters, this function
returns only the Wikimedia language name.
 
Adapted from code taken from Module:Check ISO 639-1.
 
]]
 
local function get_iso639_code (lang)
if 'norwegian' == lang:lower() then -- special case related to Wikimedia remap of code 'no' at Extension:CLDR
return 'Norwegian', 'no'; -- Make sure rendered version is properly capitalized
end
local languages = mw.language.fetchLanguageNames('en', 'all') -- get a list of language names known to Wikimedia
-- ('all' is required for North Ndebele, South Ndebele, and Ojibwa)
local langlc = mw.ustring.lower(lang); -- lower case version for comparisons
for code, name in pairs(languages) do -- scan the list to see if we can find our language
if langlc == mw.ustring.lower(name) then
if 2 ~= code:len() then -- ISO639-1 codes only
return name; -- so return the name but not the code
end
return name, code; -- found it, return name to ensure proper capitalization and the ISO639-1 code
end
end
return lang; -- not valid language; return language in original case and nil for ISO639-1 code
end
 
--[[--------------------------< L A N G U A G E _ P A R A M E T E R >------------------------------------------
 
Get language name from ISO639-1 code value provided.  If a code is valid use the returned name; if not, then use the value that was provided with the language parameter.
 
There is an exception.  There are three ISO639-1 codes for Norewegian language variants.  There are two official variants: Norwegian Bokmål (code 'nb') and
Norwegian Nynorsk (code 'nn').  The third, code 'no',  is defined by ISO639-1 as 'Norwegian' though in Norway this is pretty much meaningless.  However, it appears
that on enwiki, editors are for the most part unaware of the nb and nn variants (compare page counts for these variants at Category:Articles with non-English-language external links.
 
Because Norwegian Bokmål is the most common language variant, Media wiki has been modified to return Norwegian Bokmål for ISO639-1 code 'no'. Here we undo that and
return 'Norwegian' when editors use |language=no.  We presume that editors don't know about the variants or can't descriminate between them.
 
See Help talk:Citation Style_1#An ISO 639-1 language name test
 
When |language= contains a valid ISO639-1 code, the page is assigned to the category for that code: Category:Norwegian-language sources (no) if
the page is a mainspace page and the ISO639-1 code is not 'en'.  Similarly, if the  parameter is |language=Norwegian, it will be categorized in the same way.
 
This function supports multiple languages in the form |language=nb, French, th where the language names or codes are separated from each other by commas.
 
]]
 
local function language_parameter (lang)
local code; -- the ISO639-1 two character code
local name; -- the language name
local language_list = {}; -- table of language names to be rendered
local names_table = {}; -- table made from the value assigned to |language=
 
names_table = mw.text.split (lang, '%s*,%s*'); -- names should be a comma separated list
 
for _, lang in ipairs (names_table) do -- reuse lang
 
if 2 == lang:len() then -- ISO639-1 language code are 2 characters (fetchLanguageName also supports 3 character codes)
name = mw.language.fetchLanguageName( lang:lower(), "en" ); -- get ISO 639-1 language name if Language is a proper code
end
if is_set (name) then -- if Language specified a valid ISO639-1 code
code = lang:lower(); -- save it
else
name, code = get_iso639_code (lang); -- attempt to get code from name (assign name here so that we are sure of proper capitalization)
end
if is_set (code) then
if 'no' == code then name = 'Norwegian' end; -- override wikimedia when code is 'no'
if 'en' ~= code then -- English not the language
add_prop_cat ('foreign_lang_source', {name, code})
end
else
add_maint_cat ('unknown_lang'); -- add maint category if not already added
end
table.insert (language_list, name);
name = ''; -- so we can reuse it
end
code = #language_list -- reuse code as number of languages in the list
if 2 >= code then
name = table.concat (language_list, ' and ') -- insert '<space>and<space>' between two language names
elseif 2 < code then
language_list[code] = 'and ' .. language_list[code]; -- prepend last name with 'and<space>'
name = table.concat (language_list, ', ') -- and concatenate with '<comma><space>' separators
end
if 'English' == name then
return ''; -- if one language and that language is English return an enpty string (no annotation)
end
return (" " .. wrap_msg ('language', name)); -- otherwise wrap with '(in ...)'
end
 
--[[--------------------------< S E T _ C S 1 _ S T Y L E >----------------------------------------------------
 
Set style settings for CS1 citation templates. Returns separator and postscript settings
 
]]
 
local function set_cs1_style (ps)
if not is_set (ps) then -- unless explicitely set to something
ps = '.'; -- terminate the rendered citation with a period
end
return '.', ps; -- separator is a full stop
end
end


--[[--------------------------< S E T _ C S 2 _ S T Y L E >----------------------------------------------------
Set style settings for CS2 citation templates. Returns separator, postscript, ref settings
]]
local function set_cs2_style (ps, ref)
if not is_set (ps) then -- if |postscript= has not been set, set cs2 default
ps = ''; -- make sure it isn't nil
end
if not is_set (ref) then -- if |ref= is not set
ref = "harv"; -- set default |ref=harv
end
return ',', ps, ref; -- separator is a comma
end
--[[--------------------------< G E T _ S E T T I N G S _ F R O M _ C I T E _ C L A S S >----------------------
When |mode= is not set or when its value is invalid, use config.CitationClass and parameter values to establish
rendered style.
]]
local function get_settings_from_cite_class (ps, ref, cite_class)
local sep;
if (cite_class == "citation") then -- for citation templates (CS2)
sep, ps, ref = set_cs2_style (ps, ref);
else -- not a citation template so CS1
sep, ps = set_cs1_style (ps);
end
return sep, ps, ref -- return them all
end
--[[--------------------------< S E T _ S T Y L E >------------------------------------------------------------
Establish basic style settings to be used when rendering the citation.  Uses |mode= if set and valid or uses
config.CitationClass from the template's #invoke: to establish style.
]]
local function set_style (mode, ps, ref, cite_class)
local sep;
if 'cs2' == mode then -- if this template is to be rendered in CS2 (citation) style
sep, ps, ref = set_cs2_style (ps, ref);
elseif 'cs1' == mode then -- if this template is to be rendered in CS1 (cite xxx) style
sep, ps = set_cs1_style (ps);
else -- anything but cs1 or cs2
if is_set (mode) then
table.insert( z.message_tail, { set_error( 'invalid_param_val', {'mode', mode}, true ) } ); -- add error message
end
sep, ps, ref = get_settings_from_cite_class (ps, ref, cite_class); -- get settings based on the template's CitationClass
end
if 'none' == ps:lower() then -- if assigned value is 'none' then
ps = ''; -- set to empty string
end
return sep, ps, ref
end
--[=[-------------------------< I S _ P D F >------------------------------------------------------------------
Determines if a url has the file extension is one of the pdf file extensions used by [[MediaWiki:Common.css]] when
applying the pdf icon to external links.
returns true if file extension is one of the recognized extension, else false
]=]
local function is_pdf (url)
return url:match ('%.pdf[%?#]?') or url:match ('%.PDF[%?#]?');
end
--[[--------------------------< S T Y L E _ F O R M A T >------------------------------------------------------
Applies css style to |format=, |chapter-format=, etc.  Also emits an error message if the format parameter does
not have a matching url parameter.  If the format parameter is not set and the url contains a file extension that
is recognized as a pdf document by MediaWiki's commons.css, this code will set the format parameter to (PDF) with
the appropriate styling.
]]
local function style_format (format, url, fmt_param, url_param)
if is_set (format) then
format = wrap_style ('format', format); -- add leading space, parenthases, resize
if not is_set (url) then
format = format .. set_error( 'format_missing_url', {fmt_param, url_param} ); -- add an error message
end
elseif is_pdf (url) then -- format is not set so if url is a pdf file then
format = wrap_style ('format', 'PDF'); -- set format to pdf
else
format = ''; -- empty string for concatenation
end
return format;
end
--[[--------------------------< G E T _ D I S P L A Y _ A U T H O R S _ E D I T O R S >------------------------
Returns a number that may or may not limit the length of the author or editor name lists.
When the value assigned to |display-authors= is a number greater than or equal to zero, return the number and
the previous state of the 'etal' flag (false by default but may have been set to true if the name list contains
some variant of the text 'et al.').
When the value assigned to |display-authors= is the keyword 'etal', return a number that is one greater than the
number of authors in the list and set the 'etal' flag true.  This will cause the list_people() to display all of
the names in the name list followed by 'et al.'
In all other cases, returns nil and the previous state of the 'etal' flag.
]]
local function get_display_authors_editors (max, count, list_name, etal)
if is_set (max) then
if 'etal' == max:lower():gsub("[ '%.]", '') then -- the :gsub() portion makes 'etal' from a variety of 'et al.' spellings and stylings
max = count + 1; -- number of authors + 1 so display all author name plus et al.
etal = true; -- overrides value set by extract_names()
elseif max:match ('^%d+$') then -- if is a string of numbers
max = tonumber (max); -- make it a number
if max >= count and 'authors' == list_name then -- AUTHORS ONLY -- if |display-xxxxors= value greater than or equal to number of authors/editors
add_maint_cat ('disp_auth_ed', list_name);
end
else -- not a valid keyword or number
table.insert( z.message_tail, { set_error( 'invalid_param_val', {'display-' .. list_name, max}, true ) } ); -- add error message
max = nil; -- unset
end
elseif 'authors' == list_name then -- AUTHORS ONLY need to clear implicit et al category
max = count + 1; -- number of authors + 1
end
return max, etal;
end
--[[--------------------------< E X T R A _ T E X T _ I N _ P A G E _ C H E C K >------------------------------
Adds page to Category:CS1 maint: extra text if |page= or |pages= has what appears to be some form of p. or pp.
abbreviation in the first characters of the parameter content.
check Page and Pages for extraneous p, p., pp, and pp. at start of parameter value:
good pattern: '^P[^%.P%l]' matches when |page(s)= begins PX or P# but not Px where x and X are letters and # is a dgiit
bad pattern: '^[Pp][Pp]' matches matches when |page(s)= begins pp or pP or Pp or PP
]]
local function extra_text_in_page_check (page, nopp)
-- local good_pattern = '^P[^%.P%l]';
local good_pattern = '^P[^%.Pp]'; -- ok to begin with uppercase P: P7 (pg 7 of section P) but not p123 (page 123) TODO: add Gg for PG or Pg?
-- local bad_pattern = '^[Pp][Pp]';
local bad_pattern = '^[Pp]?[Pp]%.?[ %d]';
if is_set (nopp) then -- don't bother checking if |nopp= is set
return;
end
if not page:match (good_pattern) and (page:match (bad_pattern) or  page:match ('^[Pp]ages?')) then
add_maint_cat ('extra_text');
end
-- if Page:match ('^[Pp]?[Pp]%.?[ %d]') or  Page:match ('^[Pp]ages?[ %d]') or
-- Pages:match ('^[Pp]?[Pp]%.?[ %d]') or  Pages:match ('^[Pp]ages?[ %d]') then
-- add_maint_cat ('extra_text');
-- end
end
--[[--------------------------< P A R S E _ V A U T H O R S _ V E D I T O R S >--------------------------------
This function extracts author / editor names from |vauthors= or |veditors= and finds matching |xxxxor-maskn= and
|xxxxor-linkn= in args.  It then returns a table of assembled names just as extract_names() does.
Author / editor names in |vauthors= or |veditors= must be in Vancouver system style. Corporate or institutional names
may sometimes be required and because such names will often fail the is_good_vanc_name() and other format compliance
tests, are wrapped in doubled paranethese ((corporate name)) to suppress the format tests.
]]
local function parse_vauthors_veditors (args, vparam, list_name)
local names = {}; -- table of names assembled from |vauthors=, |author-maskn=, |author-linkn=
local v_name_table = {};
local etal = false; -- return value set to true when we find some form of et al. vauthors parameter
local last, first, link, mask;
local corporate = false;
vparam, etal = name_has_etal (vparam, etal, true); -- find and remove variations on et al. do not categorize (do it here because et al. might have a period)
if vparam:find ('%[%[') or vparam:find ('%]%]') then -- no wikilinking vauthors names
add_vanc_error ();
end
v_name_table = mw.text.split(vparam, "%s*,%s*") -- names are separated by commas
for i, v_name in ipairs(v_name_table) do
if v_name:match ('^%(%(.+%)%)$') then -- corporate authors are wrapped in doubled parenthese to supress vanc formatting and error detection
first = ''; -- set to empty string for concatenation and because it may have been set for previous author/editor
last = v_name:match ('^%(%((.+)%)%)$')
corporate = true;
elseif string.find(v_name, "%s") then
    lastfirstTable = {}
    lastfirstTable = mw.text.split(v_name, "%s")
    first = table.remove(lastfirstTable); -- removes and returns value of last element in table which should be author intials
    last  = table.concat(lastfirstTable, " ") -- returns a string that is the concatenation of all other names that are not initials
else
first = ''; -- set to empty string for concatenation and because it may have been set for previous author/editor
last = v_name; -- last name or single corporate name?  Doesn't support multiword corporate names? do we need this?
end
if is_set (first) and not mw.ustring.match (first, "^%u?%u$") then -- first shall contain one or two upper-case letters, nothing else
add_vanc_error ();
end
-- this from extract_names ()
link = select_one( args, cfg.aliases[list_name .. '-Link'], 'redundant_parameters', i );
mask = select_one( args, cfg.aliases[list_name .. '-Mask'], 'redundant_parameters', i );
names[i] = {last = last, first = first, link = link, mask = mask, corporate=corporate}; -- add this assembled name to our names list
end
return names, etal; -- all done, return our list of names
end
--[[--------------------------< S E L E C T _ A U T H O R _ E D I T O R _ S O U R C E >------------------------
Select one of |authors=, |authorn= / |lastn / firstn=, or |vauthors= as the source of the author name list or
select one of |editors=, |editorn= / editor-lastn= / |editor-firstn= or |veditors= as the source of the editor name list.
Only one of these appropriate three will be used.  The hierarchy is: |authorn= (and aliases) highest and |authors= lowest and
similarly, |editorn= (and aliases) highest and |editors= lowest
When looking for |authorn= / |editorn= parameters, test |xxxxor1= and |xxxxor2= (and all of their aliases); stops after the second
test which mimicks the test used in extract_names() when looking for a hole in the author name list.  There may be a better
way to do this, I just haven't discovered what that way is.
Emits an error message when more than one xxxxor name source is provided.
In this function, vxxxxors = vauthors or veditors; xxxxors = authors or editors as appropriate.
]]
local function select_author_editor_source (vxxxxors, xxxxors, args, list_name)
local lastfirst = false;
if select_one( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', 1 ) or -- do this twice incase we have a first 1 without a last1
select_one( args, cfg.aliases[list_name .. '-Last'], 'redundant_parameters', 2 ) then
lastfirst=true;
end
if (is_set (vxxxxors) and true == lastfirst) or -- these are the three error conditions
(is_set (vxxxxors) and is_set (xxxxors)) or
(true == lastfirst and is_set (xxxxors)) then
local err_name;
if 'AuthorList' == list_name then -- figure out which name should be used in error message
err_name = 'author';
else
err_name = 'editor';
end
table.insert( z.message_tail, { set_error( 'redundant_parameters',
{err_name .. '-name-list parameters'}, true ) } ); -- add error message
end
if true == lastfirst then return 1 end; -- return a number indicating which author name source to use
if is_set (vxxxxors) then return 2 end;
if is_set (xxxxors) then return 3 end;
return 0; -- no authors so return 0
end
--[[--------------------------< C I T A T I O N 0 >------------------------------------------------------------
This is the main function doing the majority of the citation formatting.
]]
local function citation0( config, args)
--[[
Load Input Parameters
The argument_wrapper facilitates the mapping of multiple aliases to single internal variable.
]]
local A = argument_wrapper( args );
local i
local PPrefix = A['PPrefix']
local PPPrefix = A['PPPrefix']
local NoPP = A['NoPP']
if in_array(NoPP:lower(), {'yes', 'true', 'y'}) then
PPPrefix = ''; -- unset these, prefix if used is in |page= or |pages=
PPrefix = '';
else
NoPP = nil; -- unset, used as a flag later
end
-- Pick out the relevant fields from the arguments.  Different citation templates
-- define different field names for the same underlying things.
local author_etal;
local a = {}; -- authors list from |lastn= / |firstn= pairs or |vauthors=
local Authors;
local NameListFormat = A['NameListFormat']; -- replaces |author-format= and |editor-format=
do -- to limit scope of selected
local selected = select_author_editor_source (A['Vauthors'], A['Authors'], args, 'AuthorList');
if 1 == selected then
a, author_etal = extract_names (args, 'AuthorList'); -- fetch author list from |authorn= / |lastn= / |firstn=, |author-linkn=, and |author-maskn=
elseif 2 == selected then
NameListFormat = 'vanc'; -- override whatever |name-list-format= might be
a, author_etal = parse_vauthors_veditors (args, args.vauthors, 'AuthorList'); -- fetch author list from |vauthors=, |author-linkn=, and |author-maskn=
elseif 3 == selected then
Authors = A['Authors']; -- use content of |authors=
end
end
local Coauthors = A['Coauthors'];
local Others = A['Others'];
local editor_etal;
local e = {}; -- editors list from |editor-lastn= / |editor-firstn= pairs or |veditors=
local Editors;
do -- to limit scope of selected
local selected = select_author_editor_source (A['Veditors'], A['Editors'], args, 'EditorList');
if 1 == selected then
e, editor_etal = extract_names (args, 'EditorList'); -- fetch editor list from |editorn= / |editor-lastn= / |editor-firstn=, |editor-linkn=, and |editor-maskn=
elseif 2 == selected then
NameListFormat = 'vanc'; -- override whatever |name-list-format= might be
e, editor_etal = parse_vauthors_veditors (args, args.veditors, 'EditorList'); -- fetch editor list from |veditors=, |editor-linkn=, and |editor-maskn=
elseif 3 == selected then
Editors = A['Editors']; -- use content of |editors=
end
end
if is_set (NameListFormat) and ('vanc' ~= NameListFormat) then -- only accepted value for this parameter is 'vanc'
table.insert( z.message_tail, { set_error( 'invalid_param_val', {'name-list-format', NameListFormat}, true ) } ); -- not vanc so add error message
NameListFormat = ''; -- set to empty string
end
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 ScriptTitle = A['ScriptTitle'];
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']; -- deprecated but used internally by cite episode
local TransChapter = A['TransChapter'];
local TitleType = A['TitleType'];
local Degree = A['Degree'];
local Docket = A['Docket'];
local ArchiveFormat = A['ArchiveFormat'];
local ArchiveURL = A['ArchiveURL'];
local URL = A['URL']
local URLorigin = A:ORIGIN('URL'); -- get name of parameter that holds URL
local ChapterURL = A['ChapterURL'];
local ChapterURLorigin = A:ORIGIN('ChapterURL'); -- get name of parameter that holds ChapterURL
local ConferenceFormat = A['ConferenceFormat'];
local ConferenceURL = A['ConferenceURL'];
local ConferenceURLorigin = A:ORIGIN('ConferenceURL'); -- get name of parameter that holds ConferenceURL
local Periodical = A['Periodical'];
local Series = A['Series'];
local Volume = A['Volume'];
local Issue = A['Issue'];
local Position = '';
local Page = A['Page'];
local Pages = hyphen_to_dash( A['Pages'] );
local At = A['At'];
local Edition = A['Edition'];
local PublicationPlace = A['PublicationPlace']
local Place = A['Place'];
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 ChapterFormat = A['ChapterFormat'];
local DoiBroken = A['DoiBroken'];
local ID = A['ID'];
local ASINTLD = A['ASINTLD'];
local IgnoreISBN = A['IgnoreISBN'];
local Embargo = A['Embargo'];
local Class = A['Class']; -- arxiv class identifier
local ID_list = extract_ids( args );
local Quote = A['Quote'];
local LayFormat = A['LayFormat'];
local LayURL = A['LayURL'];
local LaySource = A['LaySource'];
local Transcript = A['Transcript'];
local TranscriptFormat = A['TranscriptFormat'];
local TranscriptURL = A['TranscriptURL']
local TranscriptURLorigin = A:ORIGIN('TranscriptURL'); -- get name of parameter that holds TranscriptURL
local LastAuthorAmp = A['LastAuthorAmp'];
local no_tracking_cats = A['NoTracking'];
--these are used by cite interview
local Callsign = A['Callsign'];
local City = A['City'];
local Program = A['Program'];
--local variables that are not cs1 parameters
local use_lowercase; -- controls capitalization of certain static text
local this_page = mw.title.getCurrentTitle(); -- also used for COinS and for language
local anchor_year; -- used in the CITEREF identifier
local COinS_date; -- used in the COinS metadata
-- set default parameter values defined by |mode= parameter.  If |mode= is empty or omitted, use CitationClass to set these values
local sepc; -- separator between citation elements for CS1 a period, for CS2, a comma
local PostScript;
local Ref;
sepc, PostScript, Ref = set_style (A['Mode']:lower(), A['PostScript'], A['Ref'], config.CitationClass);
use_lowercase = ( sepc == ',' ); -- used to control capitalization for certain static text
--check this page to see if it is in one of the namespaces that cs1 is not supposed to add to the error categories
if not is_set (no_tracking_cats) then -- ignore if we are already not going to categorize this page
if in_array (this_page.nsText, cfg.uncategorized_namespaces) then
no_tracking_cats = "true"; -- set no_tracking_cats
end
for _,v in ipairs (cfg.uncategorized_subpages) do -- cycle through page name patterns
if this_page.text:match (v) then -- test page name against each pattern
no_tracking_cats = "true"; -- set no_tracking_cats
break; -- bail out if one is found
end
end
end
-- check for extra |page=, |pages= or |at= parameters.
if is_set(Page) then
if is_set(Pages) or is_set(At) then
Page = Page .. " " .. set_error('extra_pages'); -- add error message
Pages = ''; -- unset the others
At = '';
end
extra_text_in_page_check (Page, NoPP); -- add this page to maint cat if |page= value begins with what looks like p. or pp.
elseif is_set(Pages) then
if is_set(At) then
Pages = Pages .. " " .. set_error('extra_pages'); -- add error messages
At = ''; -- unset
end
extra_text_in_page_check (Pages, NoPP); -- add this page to maint cat if |page= value begins with what looks like p. or pp.
end
-- both |publication-place= and |place= (|location=) allowed if different
if not is_set(PublicationPlace) and is_set(Place) then
PublicationPlace = Place; -- promote |place= (|location=) to |publication-place
end
if PublicationPlace == Place then Place = ''; end -- don't need both if they are the same
--[[
--[[
Parameter remapping for cite encyclopedia:
This is the main function foing the majority of the citation
When the citation has these parameters:
formatting.
|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
|url maps to |chapterurl when |title is remapped
 
All other combinations of |encyclopedia, |title, and |article are not modified
TODO: script-title to script-chapter if and when we support script-chapter
]]
]]
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 Encyclopedia = A['Encyclopedia'];
    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' );


if ( config.CitationClass == "encyclopaedia" ) or ( config.CitationClass == "citation" and is_set (Encyclopedia)) then -- test code for citation
    local Coauthors = A['Coauthors'];
if is_set(Periodical) then -- Periodical is set when |encyclopedia is set
    local Others = A['Others'];
if is_set(Title) then
    local Editors = A['Editors'];
if not is_set(Chapter) then
    local e = extractnames( args, 'EditorList' );
Chapter = Title; -- |encyclopedia and |title are set so map |title to |article and |encyclopedia to |title
TransChapter = TransTitle;
ChapterURL = URL;
if not is_set (ChapterURL) and is_set (TitleLink) then
Chapter= '[[' .. TitleLink .. '|' .. Chapter .. ']]';
end
Title = Periodical;
ChapterFormat = Format;
Periodical = ''; -- redundant so unset
TransTitle = ''; -- redundant so unset
URL = ''; -- redundant so unset
Format = ''; -- redundant so unset
TitleLink = ''; -- 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


-- Special case for cite techreport.
    local Year = A['Year'];
if (config.CitationClass == "techreport") then -- special case for cite techreport
    local PublicationDate = A['PublicationDate'];
if is_set(Issue) then -- cite techreport uses 'number', which other citations aliase to 'issue'
    local OrigYear = A['OrigYear'];
if not is_set(ID) then -- can we use ID for the "number"?
    local Date = A['Date'];
ID = Issue; -- yes, use it
    local LayDate = A['LayDate'];
Issue = ""; -- unset Issue so that "number" isn't duplicated in the rendered citation or COinS metadata
    ------------------------------------------------- Get title data
else -- can't use ID so emit error message
    local Title = A['Title'];
ID = ID .. " " .. set_error('redundant_parameters', '<code>&#124;id=</code> and <code>&#124;number=</code>');
    local BookTitle = A['BookTitle'];
end
    local Conference = A['Conference'];
end
    local TransTitle = A['TransTitle'];
end
    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 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


-- special case for cite interview
    local Series = A['Series'];
if (config.CitationClass == "interview") then
    local Volume = A['Volume'];
if is_set(Program) then
    local Issue = A['Issue'];
ID = ' ' .. Program;
    local Position = '';
end
    local Page, Pages, At, page_type;
if is_set(Callsign) then
   
if is_set(ID) then
    Page = A['Page'];
ID = ID .. sepc .. ' ' .. Callsign;
    Pages = hyphentodash( A['Pages'] );
else
    At = A['At'];
ID = ' ' .. Callsign;
   
end
    if is_set(Page) then
end
        if is_set(Pages) or is_set(At) then
if is_set(City) then
            Page = Page .. " " .. seterror('extra_pages');
if is_set(ID) then
            Pages = '';
ID = ID .. sepc .. ' ' .. City;
            At = '';
else
        end
ID = ' ' .. City;
    elseif is_set(Pages) then
end
        if is_set(At) then
end
            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 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'];


if is_set(Others) then
    local ID_list = extractids( args );
if is_set(TitleType) then
   
Others = ' ' .. TitleType .. ' with ' .. Others;
    local Quote = A['Quote'];
TitleType = '';
    local PostScript = A['PostScript'];
else
    local LayURL = A['LayURL'];
Others = ' ' .. 'Interview with ' .. Others;
    local LaySource = A['LaySource'];
end
    local Transcript = A['Transcript'];
else
    local TranscriptURL = A['TranscriptURL']
Others = '(Interview)';
    local TranscriptURLorigin = A:ORIGIN('TranscriptURL');
end
    local sepc = A['Separator'];
end
    local LastAuthorAmp = A['LastAuthorAmp'];
    local no_tracking_cats = A['NoTracking'];


-- special case for cite mailing list
    local use_lowercase = ( sepc ~= '.' );
if (config.CitationClass == "mailinglist") then
    local this_page = mw.title.getCurrentTitle();  --Also used for COinS
Periodical = A ['MailingList'];
   
end
    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


-- Account for the oddity that is {{cite conference}}, before generation of COinS data.
    if ( config.CitationClass == "journal" ) then
if 'conference' == config.CitationClass then
        if not is_set(URL) and is_set(ID_list['PMC']) then
if is_set(BookTitle) then
            local Embargo = A['Embargo'];
Chapter = Title;
            if is_set(Embargo) then
-- ChapterLink = TitleLink; -- |chapterlink= is deprecated
                local lang = mw.getContentLanguage();
ChapterURL = URL;
                local good1, result1, good2, result2;
ChapterURLorigin = URLorigin;
                good1, result1 = pcall( lang.formatDate, lang, 'U', Embargo );
URLorigin = '';
                good2, result2 = pcall( lang.formatDate, lang, 'U' );
ChapterFormat = Format;
               
TransChapter = TransTitle;
                if good1 and good2 and tonumber( result1 ) < tonumber( result2 ) then
Title = BookTitle;
                    URL = "http://www.ncbi.nlm.nih.gov/pmc/articles/PMC" .. ID_list['PMC'];
Format = '';
                    URLorigin = cfg.id_handlers['PMC'].parameters[1];
-- TitleLink = '';
                end
TransTitle = '';
            else
URL = '';
                URL = "http://www.ncbi.nlm.nih.gov/pmc/articles/PMC" .. ID_list['PMC'];
end
                URLorigin = cfg.id_handlers['PMC'].parameters[1];
elseif 'speech' ~= config.CitationClass then
            end
Conference = ''; -- not cite conference or cite speech so make sure this is empty string
        end
end
    end


-- cite map oddities
    -- At this point fields may be nil if they weren't specified in the template use.  We can use that fact.
local Cartography = "";
   
local Scale = "";
    -- Account for the oddity that is {{cite conference}}, before generation of COinS data.
local Sheet = A['Sheet'] or '';
    if is_set(BookTitle) then
local Sheets = A['Sheets'] or '';
        Chapter = Title;
if config.CitationClass == "map" then
        ChapterLink = TitleLink;
Chapter = A['Map'];
        TransChapter = TransTitle;
ChapterURL = A['MapURL'];
        Title = BookTitle;
TransChapter = A['TransMap'];
        TitleLink = '';
ChapterURLorigin = A:ORIGIN('MapURL');
        TransTitle = '';
ChapterFormat = A['MapFormat'];
    end
    -- Account for the oddity that is {{cite episode}}, before generation of COinS data.
Cartography = A['Cartography'];
    if config.CitationClass == "episode" then
if is_set( Cartography ) then
        local AirDate = A['AirDate'];
Cartography = sepc .. " " .. wrap_msg ('cartography', Cartography, use_lowercase);
        local SeriesLink = A['SeriesLink'];
end
        local Season = A['Season'];
Scale = A['Scale'];
        local SeriesNumber = A['SeriesNumber'];
if is_set( Scale ) then
        local Network = A['Network'];
Scale = sepc .. " " .. Scale;
        local Station = A['Station'];
end
        local s, n = {}, {};
end
        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(Date, Year, PublicationDate),
        ['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,
    };


-- Account for the oddities that are {{cite episode}} and {{cite serial}}, before generation of COinS data.
    if is_set(Periodical) and not is_set(Chapter) and is_set(Title) then
if 'episode' == config.CitationClass or 'serial' == config.CitationClass then
        Chapter = Title;
local AirDate = A['AirDate'];
        ChapterLink = TitleLink;
local Began = A['Began']; -- these two are deprecated because the module understands date ranges
        TransChapter = TransTitle;
local Ended = A['Ended'];
        Title = '';
local SeriesLink = A['SeriesLink'];
        TitleLink = '';
local Network = A['Network'];
        TransTitle = '';
local Station = A['Station'];
    end
local s, n = {}, {};


-- do common parameters first
    -- Now perform various field substitutions.
if is_set(Network) then table.insert(n, Network); end
    -- We also add leading spaces and surrounding markup and punctuation to the
if is_set(Station) then table.insert(n, Station); end
    -- various parts of the citation, but only when they are non-nil.
ID = table.concat(n, sepc .. ' ');
    if not is_set(Authors) then
        local Maximum = tonumber( A['DisplayAuthors'] );
if not is_set (Date) then -- promote airdate or Began/Ended to date
       
if is_set (AirDate) then
        -- Preserve old-style implicit et al.
Date = AirDate;
        if not is_set(Maximum) and #a == 9 then  
elseif is_set (Began) then -- deprecated
            Maximum = 8;
if Began:match('%s') or Ended:match('%s') then -- so we don't create errors: if either has spaces then
            table.insert( z.message_tail, { seterror('implict_etal_author', {}, true ) } );
Date = Began .. ' – ' .. Ended; -- use spaced ndash as separator
        elseif not is_set(Maximum) then
else
            Maximum = #a + 1;
Date = Began .. '–' .. Ended; -- elsewise no spaces
        end
end
           
end
        local control = {
end
            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 'episode' == config.CitationClass then -- handle the oddities that are strictly {{cite episode}}
    local EditorCount
local Season = A['Season'];
    if not is_set(Editors) then
local SeriesNumber = A['SeriesNumber'];
        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


if is_set (Season) and is_set (SeriesNumber) then -- these are mutually exclusive so if both are set
        local control = {
table.insert( z.message_tail, { set_error( 'redundant_parameters', {wrap_style ('parameter', 'season') .. ' and ' .. wrap_style ('parameter', 'seriesno')}, true ) } ); -- add error message
            sep = A["EditorSeparator"] .. " ",
SeriesNumber = ''; -- unset; prefer |season= over |seriesno=
            namesep = (first_set(A["EditorNameSeparator"], A["NameSeparator"]) or "") .. " ",
end
            format = A['EditorFormat'],
-- assemble a table of parts concatenated later into Series
            maximum = Maximum,
if is_set(Season) then table.insert(s, wrap_msg ('season', Season, use_lowercase)); end
            lastauthoramp = LastAuthorAmp
if is_set(SeriesNumber) then table.insert(s, wrap_msg ('series', SeriesNumber, use_lowercase)); end
        };
if is_set(Issue) then table.insert(s, wrap_msg ('episode', Issue, use_lowercase)); end
Issue = ''; -- unset because this is not a unique parameter
Chapter = Title; -- promote title parameters to chapter
ChapterLink = TitleLink; -- alias episodelink
TransChapter = TransTitle;
ChapterURL = URL;
ChapterURLorigin = A:ORIGIN('URL');
Title = Series; -- promote series to title
TitleLink = SeriesLink;
Series = table.concat(s, sepc .. ' '); -- this is concatenation of season, seriesno, episode number


if is_set (ChapterLink) and not is_set (ChapterURL) then -- link but not URL
        Editors, EditorCount = listpeople(control, e);
Chapter = '[[' .. ChapterLink .. '|' .. Chapter .. ']]'; -- ok to wikilink
    else
elseif is_set (ChapterLink) and is_set (ChapterURL) then -- if both are set, URL links episode;
        EditorCount = 1;
Series = '[[' .. ChapterLink .. '|' .. Series .. ']]'; -- series links with ChapterLink (episodelink -> TitleLink -> ChapterLink) ugly
    end
end
URL = ''; -- unset
TransTitle = ''; -- unset
else -- now oddities that are cite serial
Issue = ''; -- unset because this parameter no longer supported by the citation/core version of cite serial
Chapter = A['Episode']; -- TODO: make |episode= available to cite episode someday?
if is_set (Series) and is_set (SeriesLink) then
Series = '[[' .. SeriesLink .. '|' .. Series .. ']]';
end
Series = wrap_style ('italic-title', Series); -- series is italicized
end
end
-- end of {{cite episode}} stuff


-- Account for the oddities that are {{cite arxiv}}, before generation of COinS data.
    local Cartography = "";
if 'arxiv' == config.CitationClass then
    local Scale = "";
if not is_set (ID_list['ARXIV']) then -- |arxiv= or |eprint= required for cite arxiv
    if config.CitationClass == "map" then
table.insert( z.message_tail, { set_error( 'arxiv_missing', {}, true ) } ); -- add error message
        if not is_set( Authors ) and is_set( PublisherName ) then
elseif is_set (Series) then -- series is an alias of version
            Authors = PublisherName;
ID_list['ARXIV'] = ID_list['ARXIV'] .. Series; -- concatenate version onto the end of the arxiv identifier
            PublisherName = "";
Series = ''; -- unset
        end
deprecated_parameter ('version'); -- deprecated parameter but only for cite arxiv
        Cartography = A['Cartography'];
end
        if is_set( Cartography ) then
            Cartography = sepc .. " " .. wrap( 'cartography', Cartography, use_lowercase );
if first_set (AccessDate, At, Chapter, Format, Page, Pages, Periodical, PublisherName, URL, -- a crude list of parameters that are not supported by cite arxiv
        end       
ID_list['ASIN'], ID_list['BIBCODE'], ID_list['DOI'], ID_list['ISBN'], ID_list['ISSN'],
        Scale = A['Scale'];
ID_list['JFM'], ID_list['JSTOR'], ID_list['LCCN'], ID_list['MR'], ID_list['OCLC'], ID_list['OL'],
        if is_set( Scale ) then
ID_list['OSTI'], ID_list['PMC'], ID_list['PMID'], ID_list['RFC'], ID_list['SSRN'], ID_list['USENETID'], ID_list['ZBL']) then
            Scale = sepc .. " " .. Scale;
table.insert( z.message_tail, { set_error( 'arxiv_params_not_supported', {}, true ) } ); -- add error message
        end       
    end
   
    if not is_set(Date) then
        Date = Year;
        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
        end
    end
   
    if inArray(PublicationDate, {Date, Year}) then PublicationDate = ''; end
    if not is_set(Date) and is_set(PublicationDate) then
        Date = PublicationDate;
        PublicationDate = '';
    end


AccessDate= ''; -- set these to empty string; not supported in cite arXiv
    -- Captures the value for Date prior to adding parens or other textual transformations
PublisherName = ''; -- (if the article has been published, use cite journal, or other)
    local DateIn = Date;
Chapter = '';
   
URL = '';
    if  not is_set(URL) and
Format = '';
        not is_set(ChapterURL) and
Page = ''; Pages = ''; At = '';
        not is_set(ArchiveURL) and
end
        not is_set(ConferenceURL) and
Periodical = 'arXiv'; -- set to arXiv for COinS; after that, must be set to empty string
        not is_set(TranscriptURL) then
end
       
        -- Test if cite web is called without giving a URL
        if ( config.CitationClass == "web" ) 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 = "[[" .. ChapterLink .. "|" .. Chapter .. "]]";
    end
    if is_set(Periodical) and is_set(Title) then
        Chapter = wrap( 'italic-title', Chapter );
        TransChapter = wrap( 'trans-italic-title', TransChapter );
    else
        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 = "[[" .. TitleLink .. "|" .. Title .. "]]"
    end
   
    if is_set(Periodical) then
        Title = wrap( 'quoted-title', Title );
        TransTitle = wrap( 'trans-quoted-title', TransTitle );
    elseif inArray(config.CitationClass, {"web","news","pressrelease","conference"}) and
            not is_set(Chapter) then
        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"}) 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"}) 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   
   
    Others = is_set(Others) and (sepc .. " " .. Others) or "";
    TitleType = is_set(TitleType) and (" (" .. TitleType .. ")") or "";
    TitleNote = is_set(TitleNote) and (sepc .. " " .. TitleNote) or "";
    Language = is_set(Language) and (" " .. wrap( 'language', Language )) 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
   
    ------------------------------------ totally unrelated data
    -- Mimic {{subscription required}} template;
    if is_set(Via) then
        Via = " " .. wrap( 'via', Via );
        SubscriptionRequired = sepc .. " " .. cfg.messages['subscription']; --citation always requires subscription if 'via' parameter is used
    elseif is_set(SubscriptionRequired) then
        SubscriptionRequired = sepc .. " " .. cfg.messages['subscription_no_via']; --here when 'via' parameter not used but 'subscription' is
    end


-- handle type parameter for those CS1 citations that have default values
    if is_set(AccessDate) then
        local retrv_text = " " .. cfg.messages['retrieved']
        if (sepc ~= ".") then retrv_text = retrv_text:lower() end
        AccessDate = '<span class="reference-accessdate">' .. sepc
            .. substitute( retrv_text, {AccessDate} ) .. '</span>'
    end
   
    if is_set(ID) then ID = sepc .." ".. ID; end
   
    ID_list = buildidlist( ID_list, {DoiBroken = DoiBroken, ASINTLD = ASINTLD, IgnoreISBN = IgnoreISBN} );


if in_array(config.CitationClass, {"AV-media-notes", "DVD-notes", "mailinglist", "map", "podcast", "pressrelease", "report", "techreport", "thesis"}) then
    if is_set(URL) then
TitleType = set_titletype (config.CitationClass, TitleType);
        URL = " " .. externallink( URL, nil, URLorigin );
if is_set(Degree) and "Thesis" == TitleType then -- special case for cite thesis
    end
TitleType = Degree .. " thesis";
end
end


if is_set(TitleType) then -- if type parameter is specified
    if is_set(Quote) then
TitleType = " (" .. TitleType .. ")"; -- display it in parentheses
        if Quote:sub(1,1) == '"' and Quote:sub(-1,-1) == '"' then
end
            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 = " &ndash; ''" .. 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"}) 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


-- legacy: promote concatenation of |month=, and |year= to Date if Date not set; or, promote PublicationDate to Date if neither Date nor Year are set.
    -- Piece all bits together at last.  Here, all should be non-nil.
if not is_set (Date) then
    -- We build things this way because it is more efficient in LUA
Date = Year; -- promote Year to Date
    -- not to keep reassigning to the same string variable over and over.
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;
end
elseif is_set(PublicationDate) then -- use PublicationDate when |date= and |year= are not set
Date = PublicationDate; -- promote 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
    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 <span/> element
Go test all of the date-holding parameters for valid MOS:DATE format and make sure that dates are real dates. This must be done before we do COinS because here is where
    if not is_set(Year) then
we get the date used in the metadata.
        if is_set(DateIn) then
            Year = selectyear( DateIn );
        elseif is_set(PublicationDate) then
            Year = selectyear( PublicationDate );
        end
    end
   
    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 ] = Year;
            id = anchorid(names)
        end
        options.id = id;
    end
   
    if string.len(text:gsub("<span[^>/]*>.-</span>", ""):gsub("%b<>","")) <= 2 then
        z.error_categories = {};
        text = seterror('empty_citation');
        z.message_tail = {};
    end
   
    if is_set(options.id) then
        text = '<span id="' .. mw.uri.anchorEncode(options.id) ..'" class="' .. mw.text.nowiki(options.class) .. '">' .. text .. "</span>";
    else
        text = '<span class="' .. mw.text.nowiki(options.class) .. '">' .. text .. "</span>";
    end       


Date validation supporting code is in Module:Citation/CS1/Date_validation
    local empty_span = '<span style="display:none;">&nbsp;</span>';
]]
   
do -- create defined block to contain local variables error_message and mismatch
    -- Note: Using display: none on then COinS span breaks some clients.
local error_message = '';
    local OCinS = '<span title="' .. OCinSoutput .. '" class="Z3988">' .. empty_span .. '</span>';
-- AirDate has been promoted to Date so not necessary to check it
    text = text .. OCinS;
anchor_year, COinS_date, error_message = dates({['accessdate']=AccessDate, ['archivedate']=ArchiveDate, ['date']=Date, ['doi_brokendate']=DoiBroken,
   
['embargo']=Embargo, ['laydate']=LayDate, ['publicationdate']=PublicationDate, ['year']=Year});
    if #z.message_tail ~= 0 then
 
        text = text .. " ";
if is_set (Year) and is_set (Date) then -- both |date= and |year= not normally needed;
        for i,v in ipairs( z.message_tail ) do
local mismatch = year_date_check (Year, Date)
            if is_set(v[1]) then
if 0 == mismatch then -- |year= does not match a year-value in |date=
                if i == #z.message_tail then
if is_set (error_message) then -- if there is already an error message
                    text = text .. errorcomment( v[1], v[2] );
error_message = error_message .. ', '; -- tack on this additional message
                else
end
                    text = text .. errorcomment( v[1] .. "; ", v[2] );
error_message = error_message .. '&#124;year= / &#124;date= mismatch';
                end
elseif 1 == mismatch then -- |year= matches year-value in |date=
            end
add_maint_cat ('date_year');
        end
end
    end
end
   
 
    no_tracking_cats = no_tracking_cats:lower();
if is_set(error_message) then
    if inArray(no_tracking_cats, {"", "no", "false", "n"}) then
table.insert( z.message_tail, { set_error( 'bad_date', {error_message}, true ) } ); -- add this error message
        for _, v in ipairs( z.error_categories ) do
end
            text = text .. '[[Category:' .. v ..']]';
end -- end of do
        end
 
    end
-- Account for the oddity that is {{cite journal}} with |pmc= set and |url= not set.  Do this after date check but before COInS.
   
-- Here we unset Embargo if PMC not embargoed (|embargo= not set in the citation) or if the embargo time has expired. Otherwise, holds embargo date
    return text
Embargo = is_embargoed (Embargo); --
 
if config.CitationClass == "journal" and not is_set(URL) and is_set(ID_list['PMC']) then
if not is_set (Embargo) then -- if not embargoed or embargo has expired
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
 
-- At this point fields may be nil if they weren't specified in the template use.  We can use that fact.
-- Test if citation has no title
if not is_set(Title) and
not is_set(TransTitle) and
not is_set(ScriptTitle) then
table.insert( z.message_tail, { set_error( 'citation_missing_title', {}, true ) } );
end
if 'none' == Title and is_set(Periodical) and not (( config.CitationClass == "encyclopaedia" ) or ( config.CitationClass == "citation" and is_set (Encyclopedia))) then -- special case
Title = ''; -- set title to empty string
add_maint_cat ('untitled');
end
 
-- COinS metadata (see <http://ocoins.info/>) for automated parsing of citation information.
-- handle the oddity that is cite encyclopedia and {{citation |encyclopedia=something}}. Here we presume that
-- when Periodical, Title, and Chapter are all set, then Periodical is the book (encyclopedia) title, Title
-- is the article title, and Chapter is a section within the article.  So, we remap
local coins_chapter = Chapter; -- default assuming that remapping not required
local coins_title = Title; -- et tu
if 'encyclopaedia' == config.CitationClass or ('citation' == config.CitationClass and is_set (Encyclopedia)) then
if is_set (Chapter) and is_set (Title) and is_set (Periodical) then -- if all are used then
coins_chapter = Title; -- remap
coins_title = Periodical;
end
end
-- this is the function call to COinS()
local OCinSoutput = COinS({
['Periodical'] = Periodical,
['Chapter'] = strip_apostrophe_markup (coins_chapter), -- Chapter stripped of bold / italic wikimarkup
['Title'] = make_coins_title (coins_title, ScriptTitle), -- Title and ScriptTitle stripped of bold / italic wikimarkup
['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'] = get_coins_pages (first_set(Sheet, Sheets, Page, Pages, At)), -- pages stripped of external links
['Edition'] = Edition,
['PublisherName'] = PublisherName,
['URL'] = first_set( URL, ChapterURL ),
['Authors'] = a,
['ID_list'] = ID_list,
['RawPage'] = this_page.prefixedText,
}, config.CitationClass);
 
-- Account for the oddities that are {{cite arxiv}}, AFTER generation of COinS data.
if 'arxiv' == config.CitationClass then -- we have set rft.jtitle in COinS to arXiv, now unset so it isn't displayed
Periodical = ''; -- periodical not allowed in cite arxiv; if article has been published, use cite journal
end
 
-- special case for cite newsgroup.  Do this after COinS because we are modifying Publishername to include some static text
if 'newsgroup' == config.CitationClass then
if is_set (PublisherName) then
PublisherName = '[[Usenet newsgroup|Newsgroup]]:&nbsp;' ..  external_link( 'news:' .. PublisherName, PublisherName );
end
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.
do -- do-block to limit scope of last_first_list
local last_first_list;
local maximum = A['DisplayAuthors'];
 
maximum , author_etal = get_display_authors_editors (maximum, #a, 'authors', author_etal);
 
local control = {
format = NameListFormat, -- empty string or 'vanc'
maximum = maximum,
lastauthoramp = LastAuthorAmp,
page_name = this_page.text -- get current page name so that we don't wikilink to it via authorlinkn
};
if is_set(Coauthors) then -- if the coauthor field is also used, prevent ampersand and et al. formatting.
control.lastauthoramp = nil;
control.maximum = #a + 1;
end
last_first_list = list_people(control, a, author_etal);
 
if is_set (Authors) then
Authors, author_etal = name_has_etal (Authors, author_etal, false); -- find and remove variations on et al.
if author_etal then
Authors = Authors .. ' ' .. cfg.messages['et al']; -- add et al. to authors parameter
end
else
Authors = last_first_list; -- either an author name list or an empty string
end
 
end -- end of do
 
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, { set_error('coauthors_missing_author', {}, true) } ); -- emit error message
end
 
local EditorCount; -- used only for choosing {ed.) or (eds.) annotation at end of editor name-list
do
local last_first_list;
local maximum = A['DisplayEditors'];
 
maximum , editor_etal = get_display_authors_editors (maximum, #e, 'editors', editor_etal);
-- Preserve old-style implicit et al.
if not is_set(maximum) and #e == 4 then
maximum = 3;
table.insert( z.message_tail, { set_error('implict_etal_editor', {}, true) } );
end
 
local control = {
format = NameListFormat, -- empty string or 'vanc'
maximum = maximum,
lastauthoramp = LastAuthorAmp,
page_name = this_page.text -- get current page name so that we don't wikilink to it via editorlinkn
};
 
last_first_list, EditorCount = list_people(control, e, editor_etal);
 
if is_set (Editors) then
if editor_etal then
Editors = Editors .. ' ' .. cfg.messages['et al']; -- add et al. to editors parameter beause |display-editors=etal
EditorCount = 2; -- with et al., |editors= is multiple names; spoof to display (eds.) annotation
else
EditorCount = 2; -- we don't know but assume |editors= is multiple names; spoof to display (eds.) annotation
end
else
Editors = last_first_list; -- either an author name list or an empty string
end
 
if 1 == EditorCount and (true == editor_etal or 1 < #e) then -- only one editor displayed but includes etal then
EditorCount = 2; -- spoof to display (eds.) annotation
end
end
 
 
-- apply |[xx-]format= styling; at the end, these parameters hold correctly styled format annotation,
-- an error message if the associated url is not set, or an empty string for concatenation
ArchiveFormat = style_format (ArchiveFormat, ArchiveURL, 'archive-format', 'archive-url');
ChapterFormat = style_format (ChapterFormat, ChapterURL, 'chapter-format', 'chapter-url');
ConferenceFormat = style_format (ConferenceFormat, ConferenceURL, 'conference-format', 'conference-url');
Format = style_format (Format, URL, 'format', 'url');
LayFormat = style_format (LayFormat, LayURL, 'lay-format', 'lay-url');
TranscriptFormat = style_format (TranscriptFormat, TranscriptURL, 'transcript-format', 'transcripturl');
 
if  not is_set(URL) then --and
-- not is_set(ArchiveURL) then --and -- prevents format_missing_url error from registering
-- not is_set(ConferenceURL) and -- TODO: keep this here? conference as part of cite web or cite podcast?
-- not is_set(TranscriptURL) then -- TODO: remove? |transcript-url= and |transcript= has separate test
-- Test if cite web or cite podcast |url= is missing or empty
if in_array(config.CitationClass, {"web","podcast", "mailinglist"}) then
table.insert( z.message_tail, { set_error( 'cite_web_url', {}, true ) } );
end
-- Test if accessdate is given without giving a URL
if is_set(AccessDate) and not is_set(ChapterURL)then -- ChapterURL may be set when the others are not set; TODO: move this to a separate test?
table.insert( z.message_tail, { set_error( 'accessdate_missing_url', {}, true ) } );
AccessDate = '';
end
end
 
local OriginalURL, OriginalFormat; -- TODO: swap chapter and title here so that archive applies to most specific if both are set?
DeadURL = DeadURL:lower(); -- used later when assembling archived text
if is_set( ArchiveURL ) then
if is_set (URL) then
OriginalURL = URL; -- save copy of original source URL
OriginalFormat = Format; -- and original |format=
if 'no' ~= DeadURL then -- if URL set then archive-url applies to it
URL = ArchiveURL -- swap-in the archive's url
URLorigin = A:ORIGIN('ArchiveURL') -- name of archive url parameter for error messages
Format = ArchiveFormat or ''; -- swap in archive's format
end
elseif is_set (ChapterURL) then -- URL not set so if chapter-url is set apply archive url to it
OriginalURL = ChapterURL; -- save copy of source chapter's url for archive text
OriginalFormat = ChapterFormat; -- and original |format=
if 'no' ~= DeadURL then
ChapterURL = ArchiveURL -- swap-in the archive's url
URLorigin = A:ORIGIN('ArchiveURL') -- name of archive url parameter for error messages
ChapterFormat = ArchiveFormat or ''; -- swap in archive's format
end
end
end
 
if in_array(config.CitationClass, {"web","news","journal","pressrelease","podcast", "newsgroup", 'arxiv'}) or
('citation' == config.CitationClass and is_set (Periodical) and not is_set (Encyclopedia)) then
if is_set (Chapter) or is_set (TransChapter) or is_set (ChapterURL)then -- chapter parameters not supported for these citation types
table.insert( z.message_tail, { set_error( 'chapter_ignored', {}, true ) } ); -- add error message
Chapter = ''; -- set to empty string to be safe with concatenation
TransChapter = '';
ChapterURL = '';
end
else -- otherwise, format chapter / article title
Chapter = format_chapter_title (Chapter, TransChapter, ChapterURL, ChapterURLorigin);
if is_set (Chapter) then
if 'map' == config.CitationClass and is_set (TitleType) then
Chapter = Chapter .. ' ' .. TitleType;
end
Chapter = Chapter .. ChapterFormat .. sepc .. ' ';
end
end
 
-- Format main title.
if is_set(TitleLink) and is_set(Title) then
Title = "[[" .. TitleLink .. "|" .. Title .. "]]"
end
 
if in_array(config.CitationClass, {"web","news","journal","pressrelease","podcast", "newsgroup", "mailinglist", 'arxiv'}) or
('citation' == config.CitationClass and is_set (Periodical) and not is_set (Encyclopedia)) or
('map' == config.CitationClass and is_set (Periodical)) then -- special case for cite map when the map is in a periodical treat as an article
Title = kern_quotes (Title); -- if necessary, separate title's leading and trailing quote marks from Module provided quote marks
Title = wrap_style ('quoted-title', Title);
Title = script_concatenate (Title, ScriptTitle); -- <bdi> tags, lang atribute, categorization, etc; must be done after title is wrapped
TransTitle= wrap_style ('trans-quoted-title', TransTitle );
elseif 'report' == config.CitationClass then -- no styling for cite report
Title = script_concatenate (Title, ScriptTitle); -- <bdi> tags, lang atribute, categorization, etc; must be done after title is wrapped
TransTitle= wrap_style ('trans-quoted-title', TransTitle ); -- for cite report, use this form for trans-title
else
Title = wrap_style ('italic-title', Title);
Title = script_concatenate (Title, ScriptTitle); -- <bdi> tags, lang atribute, categorization, etc; must be done after title is wrapped
TransTitle = wrap_style ('trans-italic-title', TransTitle);
end
 
TransError = "";
if is_set(TransTitle) then
if is_set(Title) then
TransTitle = " " .. TransTitle;
else
TransError = " " .. set_error( 'trans_missing_title' );
end
end
Title = Title .. TransTitle;
if is_set(Title) then
if not is_set(TitleLink) and is_set(URL) then
Title = external_link( URL, Title ) .. TransError .. Format;
URL = "";
Format = "";
else
Title = Title .. TransError;
end
end
 
if is_set(Place) then
Place = " " .. wrap_msg ('written', Place, use_lowercase) .. sepc .. " ";
end
 
if is_set (Conference) then
if is_set (ConferenceURL) then
Conference = external_link( ConferenceURL, Conference );
end
Conference = sepc .. " " .. Conference .. ConferenceFormat;
elseif is_set(ConferenceURL) then
Conference = sepc .. " " .. external_link( 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 in_array(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 in_array(config.CitationClass, {"encyclopaedia","web","book","news","podcast"}) then
Page = ": " .. Page;
else
Page = sepc .." " .. PPrefix .. Page;
end
end
 
if 'map' == config.CitationClass then -- cite map oddity done after COinS call (and with other in-source locators)
if is_set (Sheet) or is_set (Sheets) then
local err_msg1 = 'sheet=, &#124;sheets'; -- default error message in case any of page pages or at are set
local err_msg2;
if is_set (Page) or is_set (Pages) or is_set (At) then -- are any set?
err_msg2 = 'page=, &#124;pages=, &#124;at'; -- a generic error message
Page = ''; Pages = ''; At = '';
elseif is_set (Sheet) and is_set (Sheets) then -- if both are set make error message
err_msg1 = 'sheet';
err_msg2 = 'sheets';
end
if is_set (err_msg2) then
table.insert( z.message_tail, { set_error( 'redundant_parameters', {wrap_style ('parameter', err_msg1) .. ' and ' .. wrap_style ('parameter', err_msg2)}, true ) } ); -- add error message
end
if not is_set (Sheet) then -- do sheet static text and formatting; Sheet has priority over Sheets if both provided
if is_set (Sheets) then
if is_set (Periodical) then
Sheet = ": Sheets " .. Sheets; -- because Sheet has priority, no need to support both later on
else
Sheet = sepc .. " Sheets " .. Sheets;
end
end
else
if is_set (Periodical) then
Sheet = ": Sheet " .. Sheet;
else
Sheet = sepc .. " Sheet " .. Sheet;
end
end
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 Sections = A['Sections'];
local Inset = A['Inset'];
if is_set( Inset ) then
Inset = sepc .. " " .. wrap_msg ('inset', Inset, use_lowercase);
end
 
if is_set( Sections ) then
Section = sepc .. " " .. wrap_msg ('sections', Sections, use_lowercase);
elseif is_set( Section ) then
Section = sepc .. " " .. wrap_msg ('section', Section, use_lowercase);
end
At = At .. Inset .. Section;
end
 
if is_set (Language) then
Language = language_parameter (Language); -- format, categories, name from ISO639-1, etc
else
Language=""; -- language not specified so make sure this is an empty string;
end
 
Others = is_set(Others) and (sepc .. " " .. Others) or "";
 
TitleNote = is_set(TitleNote) and (sepc .. " " .. TitleNote) or "";
if is_set (Edition) then
if Edition:match ('[Ee]d%.?$') or Edition:match ('[Ee]dition$') then
add_maint_cat ('extra_text', 'edition');
end
Edition = " " .. wrap_msg ('edition', Edition);
else
Edition = '';
end
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>" .. hyphen_to_dash(Volume) .. "</b>";
end
end
 
------------------------------------ totally unrelated data
if is_set(Via) then
Via = " " .. wrap_msg ('via', Via);
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 in_array(SubscriptionRequired:lower(), {'yes', 'true', 'y'}) then
SubscriptionRequired = sepc .. " " .. cfg.messages['subscription']; -- subscription required message
elseif in_array(RegistrationRequired:lower(), {'yes', 'true', 'y'}) then
SubscriptionRequired = sepc .. " " .. cfg.messages['registration']; -- registration required message
else
SubscriptionRequired = ''; -- either or both might be set to something other than yes true y
end
 
if is_set(AccessDate) then
local retrv_text = " " .. cfg.messages['retrieved']
 
AccessDate = nowrap_date (AccessDate); -- wrap in nowrap span if date in appropriate format
if (sepc ~= ".") then retrv_text = retrv_text:lower() end -- if 'citation', lower case
AccessDate = substitute (retrv_text, AccessDate); -- add retrieved text
-- neither of these work; don't know why; it seems that substitute() isn't being called
AccessDate = substitute (cfg.presentation['accessdate'], {sepc, AccessDate}); -- allow editors to hide accessdates
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
  if "report" == config.CitationClass and is_set(Docket) then -- for cite report when |docket= is set
ID = sepc .. ' ' .. Docket; -- overwrite ID even if |id= is set
end
 
ID_list = build_id_list( ID_list, {DoiBroken = DoiBroken, ASINTLD = ASINTLD, IgnoreISBN = IgnoreISBN, Embargo=Embargo, Class = Class} );
 
if is_set(URL) then
URL = " " .. external_link( 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_style ('quoted-text', Quote ); -- wrap in <q>...</q> tags
PostScript = ""; -- CS1 does not supply terminal punctuation when |quote= is set
end
local Archived
if is_set(ArchiveURL) then
if not is_set(ArchiveDate) then
ArchiveDate = set_error('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'],
{ external_link( ArchiveURL, arch_text ) .. ArchiveFormat, ArchiveDate } );
if not is_set(OriginalURL) then
Archived = Archived .. " " .. set_error('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,
{ external_link( OriginalURL, cfg.messages['original'] ) .. OriginalFormat, ArchiveDate } ); -- format already styled
else
local arch_text = cfg.messages['archived-missing'];
if sepc ~= "." then arch_text = arch_text:lower() end
Archived = sepc .. " " .. substitute( arch_text,
{ set_error('archive_missing_url'), ArchiveDate } );
end
elseif is_set (ArchiveFormat) then
Archived = ArchiveFormat; -- if set and ArchiveURL not set ArchiveFormat has error message
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; ''" .. safe_for_italics(LaySource) .. "''";
else
LaySource = "";
end
if sepc == '.' then
Lay = sepc .. " " .. external_link( LayURL, cfg.messages['lay summary'] ) .. LayFormat .. LaySource .. LayDate
else
Lay = sepc .. " " .. external_link( LayURL, cfg.messages['lay summary']:lower() ) .. LayFormat .. LaySource .. LayDate
end
elseif is_set (LayFormat) then -- Test if |lay-format= is given without giving a |lay-url=
Lay = sepc .. LayFormat; -- if set and LayURL not set, then LayFormat has error message
end
 
if is_set(Transcript) then
if is_set(TranscriptURL) then
Transcript = external_link( TranscriptURL, Transcript );
end
Transcript = sepc .. ' ' .. Transcript .. TranscriptFormat;
elseif is_set(TranscriptURL) then
Transcript = external_link( TranscriptURL, nil, TranscriptURLorigin );
end
 
local Publisher;
if is_set(Periodical) and
not in_array(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_msg ('published', PublicationDate);
else
Publisher = PublicationDate;
end
end
if is_set(Publisher) then
Publisher = " (" .. Publisher .. ")";
end
else
if is_set(PublicationDate) then
PublicationDate = " (" .. wrap_msg ('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_style ('italic-title', Periodical)
else
Periodical = wrap_style ('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 in_array(config.CitationClass, {"journal","citation"}) and is_set(Periodical) then
if is_set(Others) then Others = Others .. sepc .. " " end
tcommon = safe_join( {Others, Title, TitleNote, Conference, Periodical, Format, TitleType, Series,
Language, Edition, Publisher, Agency, Volume, Issue}, sepc );
elseif 'map' == config.CitationClass then -- special cases for cite map
if is_set (Chapter) then -- map in a book; TitleType is part of Chapter
tcommon = safe_join( {Title, Format, Edition, Scale, Series, Language, Cartography, Others, Publisher, Volume}, sepc );
elseif is_set (Periodical) then -- map in a periodical
tcommon = safe_join( {Title, TitleType, Format, Periodical, Scale, Series, Language, Cartography, Others, Publisher, Volume, Issue}, sepc );
else -- a sheet or stand-alone map
tcommon = safe_join( {Title, TitleType, Format, Edition, Scale, Series, Language, Cartography, Others, Publisher}, sepc );
end
elseif 'episode' == config.CitationClass then -- special case for cite episode
tcommon = safe_join( {Title, TitleNote, TitleType, Series, Transcript, Language, Edition, Publisher}, sepc );
else -- all other CS1 templates
tcommon = safe_join( {Title, TitleNote, Conference, Periodical, Format, TitleType, Series, Language,
Volume, Issue, Others, Edition, Publisher, Agency}, sepc );
end
if #ID_list > 0 then
ID_list = safe_join( { sepc .. " ",  table.concat( ID_list, sepc .. " " ), ID }, sepc );
else
ID_list = ID;
end
local idcommon = safe_join( { ID_list, URL, Archived, AccessDate, Via, SubscriptionRequired, Lay, Quote }, sepc );
local text;
local pgtext = Position .. Sheet .. Page .. Pages .. At;
if is_set(Authors) then
if is_set(Coauthors) then
local sep = '; ';
if 'vanc' == NameListFormat then
sep = ', ';
end
Authors = Authors .. sep .. 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) or (string.sub(Editors,-3,-1) == sepc .. ']]') then -- if last editor name ends with sepc char
Editors = Editors .. " "; -- don't add another
else
Editors = Editors .. sepc .. " " -- otherwise terninate the editor list
end
end
text = safe_join( {Authors, Date, Chapter, Place, Editors, tcommon }, sepc );
text = safe_join( {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 = safe_join( {Editors, Date, Chapter, Place, tcommon}, sepc );
text = safe_join( {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 = safe_join( {Chapter, Place, tcommon}, sepc );
text = safe_join( {text, pgtext, Date, idcommon}, sepc );
else
text = safe_join( {Chapter, Place, tcommon, Date}, sepc );
text = safe_join( {text, pgtext, idcommon}, sepc );
end
end
if is_set(PostScript) and PostScript ~= sepc then
text = safe_join( {text, sepc}, sepc );  --Deals with italics, spaces, etc.
text = text:sub(1,-sepc:len()-1);
end
text = safe_join( {text, PostScript}, sepc );
 
-- Now enclose the whole thing in a <span/> 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 and for YMD dates that require disambiguation
id = anchor_id(names)
end
options.id = id;
end
if string.len(text:gsub("<span[^>/]*>.-</span>", ""):gsub("%b<>","")) <= 2 then
z.error_categories = {};
text = set_error('empty_citation');
z.message_tail = {};
end
if is_set(options.id) then
text = '<span id="' .. mw.uri.anchorEncode(options.id) ..'" class="' .. mw.text.nowiki(options.class) .. '">' .. text .. "</span>";
else
text = '<span class="' .. mw.text.nowiki(options.class) .. '">' .. text .. "</span>";
end
 
local empty_span = '<span style="display:none;">&nbsp;</span>';
-- Note: Using display: none on then COinS span breaks some clients.
local OCinS = '<span title="' .. OCinSoutput .. '" class="Z3988">' .. empty_span .. '</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 .. error_comment( v[1], v[2] );
else
text = text .. error_comment( v[1] .. "; ", v[2] );
end
end
end
end
 
if #z.maintenance_cats ~= 0 then
text = text .. '<span class="citation-comment" style="display:none; color:#33aa33">';
for _, v in ipairs( z.maintenance_cats ) do -- append maintenance categories
text = text .. ' ' .. v .. ' ([[:Category:' .. v ..'|link]])';
end
text = text .. '</span>'; -- maintenance mesages (realy just the names of the categories for now)
end
no_tracking_cats = no_tracking_cats:lower();
if in_array(no_tracking_cats, {"", "no", "false", "n"}) then
for _, v in ipairs( z.error_categories ) do
text = text .. '[[Category:' .. v ..']]';
end
for _, v in ipairs( z.maintenance_cats ) do -- append maintenance categories
text = text .. '[[Category:' .. v ..']]';
end
for _, v in ipairs( z.properties_cats ) do -- append maintenance categories
text = text .. '[[Category:' .. v ..']]';
end
end
return text
end
end


-- This is used by templates such as {{cite book}} to create the actual citation text.
-- This is used by templates such as {{cite book}} to create the actual citation text.
function z.citation(frame)
function z.citation(frame)
local pframe = frame:getParent()
    local pframe = frame:getParent()
local validation;
   
    local args = {};
if nil ~= string.find (frame:getTitle(), 'sandbox', 1, true) then -- did the {{#invoke:}} use sandbox version?
    local suggestions = {};
cfg = mw.loadData ('Module:Citation/CS1/Configuration/sandbox'); -- load sandbox versions of Configuration and Whitelist and ...
    local error_text, error_state;
whitelist = mw.loadData ('Module:Citation/CS1/Whitelist/sandbox');
validation = require ('Module:Citation/CS1/Date_validation/sandbox'); -- ... sandbox version of date validation code
 
else -- otherwise
cfg = mw.loadData ('Module:Citation/CS1/Configuration'); -- load live versions of Configuration and Whitelist and ...
whitelist = mw.loadData ('Module:Citation/CS1/Whitelist');
validation = require ('Module:Citation/CS1/Date_validation'); -- ... live version of date validation code
end
 
dates = validation.dates; -- imported functions
year_date_check = validation.year_date_check;
 
local args = {};
local suggestions = {};
local error_text, error_state;


local config = {};
    local config = {};
for k, v in pairs( frame.args ) do
    for k, v in pairs( frame.args ) do
config[k] = v;
        config[k] = v;
args[k] = v;  
        args[k] = v;      
end
    end  


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


return z
return z

مراجعة 10:18، 9 يوليو 2016

cs1 قالب:Pipe cs2 modules
  live sandbox description
sysop وحدة:Citation/CS1 Module:Citation/CS1/sandbox [edit] Rendering and support functions
وحدة:Citation/CS1/Configuration Module:Citation/CS1/Configuration/sandbox [edit] Translation tables; error and identifier handlers
وحدة:Citation/CS1/Whitelist Module:Citation/CS1/Whitelist/sandbox [edit] List of active, deprecated, and obsolete cs1قالب:Pipe2 parameters
وحدة:Citation/CS1/Date validation Module:Citation/CS1/Date validation/sandbox [edit] Date format validation functions
Module:Citation/CS1/Identifiers Module:Citation/CS1/Identifiers/sandbox [edit] Functions that support the named identifiers (isbn, doi, pmid, etc)
Module:Citation/CS1/Utilities Module:Citation/CS1/Utilities/sandbox [edit] Common functions and tables
Module:Citation/CS1/COinS Module:Citation/CS1/COinS/sandbox [edit] Functions that render a cs1قالب:Pipe2 template's metadata
auto confirmed وحدة:Citation/CS1/Suggestions Module:Citation/CS1/Suggestions/sandbox [edit] List that maps common erroneous parameter names to valid parameter names

<section end=module_components_table />


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

-- 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;
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

-- Checks that parameter name is valid using the whitelist
function validate( name )
    name = tostring( name );
    
    -- Normal arguments
    if whitelist.basic_arguments[ name ] then
        return true;
    end
    
    -- Arguments with numbers in them
    name = name:gsub( "%d+", "#" );
    if whitelist.numbered_arguments[ name ] then
        return true;
    end
    
    -- Not found, argument not supported.
    return false
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 %s]',
        options.link, options.label, options.separator or "&nbsp;",
        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[[%s%s%s|%s]]',
        options.link, options.label, options.separator or "&nbsp;",
        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

-- 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
        text = "[[" .. handler.link .. "|" .. handler.label .. "]]:" .. id;
        table.insert( z.error_categories, "Pages with DOIs inactive since " .. selectyear(inactive) );        
        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 ( string.sub(id,1,3) ~= "10." ) then      
        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

--[[
Determines whether an 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

-- Determines whether an ISBN string is valid
function checkisbn( isbn_str )
    isbn_str = cleanisbn( isbn_str ):gsub( "-", "" );
    local len = isbn_str:len();
 
    if len ~= 10 and len ~= 13 then
        return false;
    end
 
    local temp = 0;
    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

-- 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
    
    return str:gsub( '[%[%]\n]', {    
        ['['] = '&#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. ]]
    
    if not is_set(str) then
        return str;
    else
        if str:sub(1,1) == "'" then str = "<span />" .. str; end
        if str:sub(-1,-1) == "'" then str = str .. "<span />"; 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  

--[[
Return the year portion of a date string, if possible.  
Returns empty string if the argument can not be interpreted
as a year.
]]
function selectyear( str )
    -- Is the input a simple number?
    local num = tonumber( str ); 
    if num ~= nil and num > 0 and num < 2100 and num == math.floor(num) then
        return str;
    else
        -- Use formatDate to interpret more complicated formats
        local lang = mw.getContentLanguage();
        local good, result;
        good, result = pcall( lang.formatDate, lang, 'Y', str )
        if good then 
            return result;
        else
            -- Can't make sense of this input, return blank.
            return "";
        end
    end
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("&mdash;",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 = "[[" .. person.link .. "|" .. 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 <span> tag to format in Small Caps
    if ( "scap" == format ) then result = 
        '<span class="smallcaps" style="font-variant:small-caps">' .. result .. '</span>';
    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 == '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 )
        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 foing 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 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

    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 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 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
    
    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

    if ( config.CitationClass == "journal" ) then
        if not is_set(URL) and is_set(ID_list['PMC']) then
            local Embargo = A['Embargo'];
            if is_set(Embargo) then
                local lang = mw.getContentLanguage();
                local good1, result1, good2, result2;
                good1, result1 = pcall( lang.formatDate, lang, 'U', Embargo );
                good2, result2 = pcall( lang.formatDate, lang, 'U' );
                
                if good1 and good2 and tonumber( result1 ) < tonumber( result2 ) then 
                    URL = "http://www.ncbi.nlm.nih.gov/pmc/articles/PMC" .. ID_list['PMC'];
                    URLorigin = cfg.id_handlers['PMC'].parameters[1];
                end
            else
                URL = "http://www.ncbi.nlm.nih.gov/pmc/articles/PMC" .. ID_list['PMC'];
                URLorigin = cfg.id_handlers['PMC'].parameters[1];
            end
        end
    end

    -- 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 {{cite conference}}, 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 {{cite episode}}, 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(Date, Year, PublicationDate),
        ['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

    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(Date) then
        Date = Year;
        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
        end
    end
    
    if inArray(PublicationDate, {Date, Year}) then PublicationDate = ''; end
    if not is_set(Date) and is_set(PublicationDate) then
        Date = PublicationDate;
        PublicationDate = '';
    end

    -- Captures the value for Date prior to adding parens or other textual transformations
    local DateIn = Date;
    
    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 is called without giving a URL
        if ( config.CitationClass == "web" ) 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 = "[[" .. ChapterLink .. "|" .. Chapter .. "]]";
    end
    if is_set(Periodical) and is_set(Title) then
        Chapter = wrap( 'italic-title', Chapter );
        TransChapter = wrap( 'trans-italic-title', TransChapter );
    else
        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 = "[[" .. TitleLink .. "|" .. Title .. "]]"
    end
    
    if is_set(Periodical) then
        Title = wrap( 'quoted-title', Title );
        TransTitle = wrap( 'trans-quoted-title', TransTitle );
    elseif inArray(config.CitationClass, {"web","news","pressrelease","conference"}) and
            not is_set(Chapter) then
        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"}) 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"}) 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    
    
    Others = is_set(Others) and (sepc .. " " .. Others) or "";
    TitleType = is_set(TitleType) and (" (" .. TitleType .. ")") or "";
    TitleNote = is_set(TitleNote) and (sepc .. " " .. TitleNote) or "";
    Language = is_set(Language) and (" " .. wrap( 'language', Language )) 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
    
    ------------------------------------ totally unrelated data
    -- Mimic {{subscription required}} template; 
    if is_set(Via) then
        Via = " " .. wrap( 'via', Via );
        SubscriptionRequired = sepc .. " " .. cfg.messages['subscription']; --citation always requires subscription if 'via' parameter is used
    elseif is_set(SubscriptionRequired) then
        SubscriptionRequired = sepc .. " " .. cfg.messages['subscription_no_via']; --here when 'via' parameter not used but 'subscription' is
    end

    if is_set(AccessDate) then
        local retrv_text = " " .. cfg.messages['retrieved']
        if (sepc ~= ".") then retrv_text = retrv_text:lower() end
        AccessDate = '<span class="reference-accessdate">' .. sepc
            .. substitute( retrv_text, {AccessDate} ) .. '</span>'
    end
    
    if is_set(ID) then ID = sepc .." ".. ID; end
    
    ID_list = buildidlist( ID_list, {DoiBroken = DoiBroken, ASINTLD = ASINTLD, IgnoreISBN = IgnoreISBN} );

    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 = " &ndash; ''" .. 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"}) 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

    -- 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 <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 = {};
    
    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 ] = Year;
            id = anchorid(names)
        end
        options.id = id;
    end
    
    if string.len(text:gsub("<span[^>/]*>.-</span>", ""):gsub("%b<>","")) <= 2 then
        z.error_categories = {};
        text = seterror('empty_citation');
        z.message_tail = {};
    end
    
    if is_set(options.id) then 
        text = '<span id="' .. mw.uri.anchorEncode(options.id) ..'" class="' .. mw.text.nowiki(options.class) .. '">' .. text .. "</span>";
    else
        text = '<span class="' .. mw.text.nowiki(options.class) .. '">' .. text .. "</span>";
    end        

    local empty_span = '<span style="display:none;">&nbsp;</span>';
    
    -- Note: Using display: none on then COinS span breaks some clients.
    local OCinS = '<span title="' .. OCinSoutput .. '" class="Z3988">' .. empty_span .. '</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 .. '[[Category:' .. v ..']]';
        end
    end
    
    return text
end

-- This is used by templates such as {{cite book}} 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