Module:City

Module documentation[ create · purge ]

This documentation is transcluded from Module:City/doc.

local p = {}

function p._getLabel(item, lang, link)
	local entity, langList, sitelink, label
	entity = mw.wikibase.getEntity(item); 
	langList = mw.language.getFallbacksFor(lang)
	table.insert(langList, 1, lang)
	
	-- choose label
	for i, language in ipairs(langList) do 
		label = entity:getLabel(language)
		if label then break end
	end
	if not label then
		label = item
	end

	-- allow different link formats
	if link=='-' then 
		return label
	elseif link=='wikidata' then
		return mw.ustring.format('[[d:%s|%s]]', item, label)
	elseif link=='commons' then
		sitelink = entity:getSitelink('commonswiki')
		if sitelink==label then
			return mw.ustring.format('[[%s]]', sitelink)
		elseif sitelink then
			return mw.ustring.format('[[%s|%s]]', sitelink, label)
		end
	end
	
	-- apply default "Wikipadia" link format
	for i, language in ipairs(langList) do 
		sitelink = entity:getSitelink(language .. 'wiki')
		if sitelink then 
			lang = language
			break 
		end
	end
	if not sitelink then
		return mw.ustring.format('[[d:%s|%s]]', item, label) -- no wiki sitelink, so link to wikidata
	else
		return mw.ustring.format('[[:%s:%s|%s]]', lang, sitelink, label)
	end
end

function p._city(place, lang, link)

    -- === STEP 1: if "place" is empty than do nothing ==============
	if (not place) or (place == "") then
		return ""
	end
	
	--=== STEP 2: Check if "place" already has a link and if so than skip the rest of the template  ==============
	if string.match(place, "[%{%{|%[%[].+[%}%}|%]%]]") then
		return place
	end
	
   -- === STEP 3: Check if "place"  holds a q-code or matches any of the hardwired names  ==============
	if string.match(place, "^Q%d+$") then
		return p._getLabel(place, lang, link)
	else
		-- if multiple calls to {{City}} from a single file, than mw.loadData should load [[Module:City/data]] only once
		local LookupTable = mw.loadData("Module:City/data")
		local item = LookupTable[mw.ustring.lower(place)]
		if item then
			return p._getLabel(item, lang, link)
		end
	end

	-- === STEP 4: Check if {{{1}}} matches existing template, gallery or category and if so provide the link  ===
	if #place>=3 and #place<40 then
		local page = mw.title.new( place, '' )
		if page and page.exists then
			return "[[" .. place .. "]]"
		end
		page = mw.title.new( place, 'category' )
		if page and page.exists then
			return string.format("[[:Category:%s|%s]]", place,place) 
		end 
	end

	-- return as is
	return place
end

function p.city(frame)
	local args = frame.args
	if not (args.lang and mw.language.isSupportedLanguage(args.lang)) then 
		args.lang = frame:callParserFunction( "int", "lang" ) -- get user's chosen language 
	end
	if (not args.link) or (mw.text.trim(args.link) == "") then
		args.link = "wikipedia"
	end
	args.place = mw.text.trim(args.place or '')
	return p._city(args.place, args.lang, args.link)
end

return p