local u = {}
local z = {
	error_categories = {};														-- for categorizing citations that contain errors
	error_ids = {};
	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 >--------------------------------------
local cfg;																		-- table of tables imported from slected Module:Citation/CS1/Configuration
--[[--------------------------< I S _ S E T >------------------------------------------------------------------
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
local function is_set( var )
	return not (var == nil or var == '');
--[[--------------------------< I N _ A R R A Y >--------------------------------------------------------------
Whether needle is in haystack
local function in_array( needle, haystack )
	if needle == nil then
		return false;
	for n,v in ipairs( haystack ) do
		if v == needle then
			return n;
	return false;
--[[--------------------------< 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;
--[[--------------------------< 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 );
--[[--------------------------< 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 );
	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;
	message = table.concat({ prefix, message, suffix });
	if raw == true then
		return message, error_state.hidden;
	return error_comment( message, error_state.hidden );
--[[-------------------------< I S _ A L I A S _ U S E D >-----------------------------------------------------
This function is used by select_one() to determine if one of a list of alias parameters is in the argument list
provided by the template.
	args – pointer to the arguments table from calling template
	alias – one of the list of possible aliases in the aliases lists from Module:Citation/CS1/Configuration
	index – for enumerated parameters, identifies which one
	enumerated – true/false flag used choose how enumerated aliases are examined
	value – value associated with an alias that has previously been selected; nil if not yet selected
	selected – the alias that has previously been selected; nil if not yet selected
	error_list – list of aliases that are duplicates of the alias already selected
	value – value associated with alias we selected or that was previously selected or nil if an alias not yet selected
	selected – the alias we selected or the alias that was previously selected or nil if an alias not yet selected
local function is_alias_used (args, alias, index, enumerated, value, selected, error_list)
	if enumerated then															-- is this a test for an enumerated parameters?
		alias = alias:gsub ('#', index);										-- replace '#' with the value in index
		alias = alias:gsub ('#', '');											-- remove '#' if it exists
	if is_set(args[alias]) then													-- alias is in the template's argument list
		if value ~= nil and selected ~= alias then								-- if we have already selected one of the aliases
			local skip;
			for _, v in ipairs(error_list) do									-- spin through the error list to see if we've added this alias
				if v == alias then
					skip = true;
					break;														-- has been added so stop looking 
			if not skip then													-- has not been added so
				table.insert( error_list, alias );								-- add error alias to the error list
			value = args[alias];												-- not yet selected an alias, so select this one
			selected = alias;
	return value, selected;														-- return newly selected alias, or previously selected alias
--[[--------------------------< 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
--[[--------------------------< 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;
		if str:sub(1,1) == "'" then str = "<span></span>" .. str; end
		if str:sub(-1,-1) == "'" then str = str .. "<span></span>"; end
		-- Remove newlines as they break italics.
		return str:gsub( '\n', ' ' );
--[[--------------------------< 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 );
	return substitute( cfg.presentation[key], {str} );
--[[--------------------------< S E L E C T _ O N E >----------------------------------------------------------
Chooses one matching parameter from a list of parameters to consider.  The list of parameters to consider is just
names.  For parameters that may be enumerated, the position of the numerator in the parameter name is identified
by the '#' so |author-last1= and |author1-last= are represented as 'author-last#' and 'author#-last'.
Because enumerated parameter |<param>1= is an alias of |<param>= we must test for both possibilities.
Generates an error if more than one match is present.
local function select_one( args, aliases_list, error_condition, index )
	local value = nil;															-- the value assigned to the selected parameter
	local selected = '';														-- the name of the parameter we have chosen
	local error_list = {};
	if index ~= nil then index = tostring(index); end
	for _, alias in ipairs( aliases_list ) do									-- for each alias in the aliases list
		if alias:match ('#') then												-- if this alias can be enumerated
			if '1' == index then												-- when index is 1 test for enumerated and non-enumerated aliases
				value, selected = is_alias_used (args, alias, index, false, value, selected, error_list);	-- first test for non-enumerated alias
			value, selected = is_alias_used (args, alias, index, true, value, selected, error_list);		-- test for enumerated alias
			value, selected = is_alias_used (args, alias, index, false, value, selected, error_list);		--test for non-enumerated alias
	if #error_list > 0 and 'none' ~= error_condition then						-- for cases where this code is used outside of extract_names()
		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);
		if #error_list > 1 then
			error_str = error_str .. cfg.messages['parameter-final-separator'];
			error_str = error_str .. cfg.messages['parameter-pair-separator'];
		error_str = error_str .. wrap_style ('parameter', selected);
		table.insert( z.message_tail, { set_error( error_condition, {error_str}, true ) } );
	return value, selected;
--[=[-------------------------< R E M O V E _ W I K I _ L I N K >----------------------------------------------
Gets the display text from 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");
--[[--------------------------< S E T _ S E L E C T E D _ M O D U L E S >--------------------------------------
Sets local cfg table to same (live or sandbox) as that used by the other modules.
local function set_selected_modules (cfg_table_ptr)
	cfg = cfg_table_ptr;
return {																		-- return exported functions and tables
	is_set = is_set,
	in_array = in_array,
	substitute = substitute,
	error_comment = error_comment,
	set_error = set_error,
	select_one = select_one,
	add_maint_cat = add_maint_cat,
	wrap_style = wrap_style;
	safe_for_italics = safe_for_italics;
	remove_wiki_link = remove_wiki_link;
	set_selected_modules = set_selected_modules;
	z = z,

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