--[[ |1=, |2=, |3=, |4=, |5=, |6=, |7=, |8=, |9=: Optional unnamed parameters for 0 to 9 items to be listed. 	Whitespace is trimmed off both ends and the strings are urlencoded as if they were query strings. |article-link=: Optional Wikipedia article name to link to. |article-name=: Optional alternative text to be displayed for |article-link= link in front of catalog link. 	If not specified, |article-link= is used for display as well. If both parameters are not specified, the prefix is omitted completely. |article-suffix=: Optional symbol to be displayed after article name or link (f.e. ":"; omitted, if not defined). |link-prefix=: Optional prefix portion of url to external catalog item(s). |link-suffix=: Optional suffix portion of url to external catalog item(s). |item-prefix=: Optional text displayed in front of each external link (omitted, if not defined) |item-suffix=: Optional text displayed immediately after each external link (omitted, if not defined) |list-separator=: Optional alternative separator displayed between list items (default: ", ", if not specified). Whitespace must be encoded. |list-leadout=: Optional alternative leadout text displayed between the last two list items (f.e. "and", "or", "as well as", etc., default is the |list-separator= or ", ".) |leadout-suffix=: Optional alternative suffix text of the leadout (see |list-leadout=) displayed between the last two list items. 	This gets added in front of the last list item instead of the default whitespace which is added without this parameter. 	This may be necessary if |list-separator= is used not only to define the list separator but also parts of the item prefix 	(except for the first one). (At present, this is used only to cope with format oddities of the  template.)  new parameters that support access icons: |allowed_icons= – comma-separated list of keywords: free, limited, registration, subscription, none, all (default; 'all' implied when this parameter empty or omitted) 	the icons specified in the following parameters are checked agains the list in |allowed-icons=; not in the list? not displayed |url-access-all= – applies specified icon to all items in the list; accepted keywords: free, limited, registration, subscription; |url-accessn= – applies specified icon to item n of the list (the nth positional parameter); accepted keywords: free, limited, registration, subscription;  ]]  require('strict'); local getArgs = require ('Module:Arguments').getArgs; local lock_icons = {															--icon classes are defined in Module:Citation/CS1/styles.css 	['free'] = {'id-lock-free', 'অবাধে প্রবেশযোগ্য'}, 	['registration'] = {'id-lock-registration', 'বিনামূল্যে নিবন্ধন প্রয়োজন'}, 	['limited'] = {'id-lock-limited', 'সীমিত ট্রায়াল সাপেক্ষে বিনামূল্যে প্রবেশ করা যায়, সাধারণত সাবস্ক্রিপশন প্রয়োজন'}, 	['subscription'] = {'id-lock-subscription', 'টাকার বিনিময়ে সাবস্ক্রিপশন আবশ্যক'}, 	}  --[[--------------------------< 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.  ]]  local function is_set( var ) 	return not (var == nil or var == ); end  --[=[-------------------------< M A K E _ L A B E L >----------------------------------------------------------  Makes a wikilinked or plain text label from arguments; when both link and display text is provided, makes a wikilink in the form D; if only link is provided, makes a wikilinked label in the form L; if only display is provided, makes a plain-text label; if neither are provided makes a label from suffix, returns an empty string else.  ]=]  local function make_label (link, display, suffix) local label = ; 	if is_set (link) then 		if is_set (display) then 			label = table.concat ({'', display, ''});			-- make D wikilinked label 		else 			label = table.concat ({'', link, ''});							-- make L wikilinked label 		end 	elseif is_set (display) then 		label = display;														-- plain-text label 	end  	if is_set (label) then														 		return table.concat ({label, suffix, ' '});						-- assemble the complete label 	else 		return suffix;															-- no space after suffix if no label 	end end  --[[--------------------------< I C O N _ I N D E X _ G E T >--------------------------------------------------  returns index into lock_icons[] if value assigned to |url-access= or |url-access-all= is a valid icon selector (free, limited, registration, subscription)  icon selection may be limited to a subset of the icons with: 	|allow_icons=<comma-separated list of allowed icons> <comma-separated list of allowed icons> may be any of the keywords: free, limited, registration, subscription, none, all  keyword 'all' is default condition; 'all' is implied when |allowed=icons= is empty or omitted  keyword 'none' for use with identifiers where icons are inappropriate (isbn, issn, oclc)  Templates using this module should set: 	|allow_icons=free for most identifiers; 	|allow_icons=none for isbn, issn, oclc, etc  |url-access= is alias of |url-access1=  ]]  local function icon_index_get (args, k) 	local icon; 	local param_name = (1 == k and is_set (args['url-access']) and 'url-access') or table.concat ({'url-access', k});	-- make an enumerated parameter name  	if is_set (args['url-access-all']) and lock_icons[args['url-access-all']] then	-- if set and valid 		icon = args['url-access-all'];											-- tentatively   	elseif is_set (args[param_name]) and lock_icons[args[param_name]] then		-- if set and valid 		icon = args[param_name];												-- tentatively  	else 		return nil;																-- neither |url-access-all= nor |url-accessn= set so return nil 	end  	if args['allow_icons'] and args['allow_icons']:find ('none') then			-- if 'none' keyword is present 		return nil;																-- icons display not allowed 	end  	if not is_set (args['allow_icons']) or args['allow_icons']:find ('all') or args['allow_icons']:find (icon) then	--if all allowed or specified icon is allowed 		return icon;															-- return selected icon as index into icon table 	end end  --[[--------------------------< M A I N >----------------------------------------------------------------------  Template entrypoint to this module; arguments come primarily from the parent frame though in templates that use this module, |allowed-icons= is typically set, if needed, in the .  ]]  local function main (frame) 	local args = getArgs (frame); 	local out_text = ;  	if is_set(args[1]) then 		local result = {}; 		local label; 		 		local article_suffix = args['article-suffix'] or args['article-postfix'] or ; 		local link_prefix = args['link-prefix'] or ; 		local link_suffix = args['link-suffix'] or args['link-postfix'] or ; 		local item_prefix = args['item-prefix'] or ; 		local item_suffix = args['item-suffix'] or args['item-postfix'] or ; 		local list_separator = args['list-separator'] or ', '; 		local leadout_suffix = args['leadout-suffix'] or args['leadout-postfix'] or ' '; 		local list_leadout;  		local icon_index; 		 		if is_set (args['list-leadout']) then 			list_leadout = table.concat ({ 				mw.ustring.gsub (args['list-leadout'], '^(%a)', ' %1'),			-- insert leading space if first character is a letter 				leadout_suffix, 			}); 		else 			list_leadout = ; 		end 		 		label = make_label (args['article-link'], args['article-name'], article_suffix);  		for k, item in ipairs (args) do											-- for each of the positional parameters 			item = mw.text.trim (item);											-- remove extraneous whitespace 			if is_set (link_prefix) then										-- if there is link prefix... 				item = table.concat ({											-- create an external link item 					'[',														-- open ext link markup 					link_prefix,												-- url prefix 					mw.uri.encode (item),										-- item is part of url 					link_suffix,												-- url suffix 					' ',														-- required space between url and label 					item_prefix,												-- label prefix 					item,														-- item as label 					item_suffix,												-- item suffix 					']'															-- close ext link markup 				});  				icon_index = icon_index_get (args, k);							-- set if icon specified and allowed for this item; nil else 				if icon_index then 					item = table.concat ({										-- add access icon markup to this item 						'',													-- close the opening span tag 						item, 						'',												-- and close the span 					}); 				end	 			else 				item = table.concat ({											-- create an unlinked item 					item_prefix,												-- label prefix 					item,														-- item as label 					item_suffix,												-- item suffix 				}); 			end 	 			table.insert (result, item);										-- add the item to the result list 		end 	 		out_text = frame:callParserFunction('#tag', {'templatestyles', , src=table.concat({ 			'মডিউল:উদ্ধৃতি', 			mw.ustring.match(frame:getTitle(), '/খেলাঘর$') or '', 			'/শৈলী.css', 		})}); 		if is_set (args['list-leadout']) then 			out_text = table.concat ({out_text, label, mw.text.listToText (result, list_separator, list_leadout)}); 		else 			out_text = table.concat ({out_text, label, table.concat (result, list_separator)}); 		end  	end	--is_set (args[1])  	return out_text end  return {main = main};