Module:City

local p = {}

function p.qCode(place) -- recover a q-code based on place name, also if one can link to a page on commons return such link local item, link = nil, nil

   -- === STEP 1: if "place" is empty than return nothing ==============

if (not place) or (place == "") then return item, link end

 -- === STEP 2: Check if "place"  holds a q-code or matches any of the hardwired names  ==============

if string.match(place, "^Q%d+$") then return place, link -- place string contains a q-code else -- if multiple calls to Template:City from a single file, than mw.loadData should load Module:City/data only once local LookupTable = mw.loadData("Module:City/data") item = LookupTable[mw.ustring.lower(place)] if item then return item, link end end

-- === STEP 3: 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 item = mw.wikibase.getEntityIdForTitle( place ) link = "" .. place .. "" if item then return item, link end end

page = mw.title.new( place, 'category' ) if page and page.exists then item = mw.wikibase.getEntityIdForTitle( 'Category:' .. place ) link = "" .. place .. "" if item then local entity = mw.wikibase.getEntityObject(item) if entity then local s = entity:getBestStatements( 'P31' ) if s[1] and s[1].mainsnak.datavalue.value.id=="Q4167836" then -- if "instance of "(P31) = "Wikimedia category" (Q4167836) s = entity:getBestStatements( 'P301' ) -- category's main topic if s[1] then -- if property "category's main topic" (P301) is set item = s[1].mainsnak.datavalue.value.id else item = nil end end end end end end return item, link end

function p._city(place, lang, link) if (not place) or (place == "") then return "" --if "place" is empty than do nothing end

if string.match(place, "[%{%{|%[%[].+[%}%}|%]%]]") then return place -- if "place" already has a link and if so than skip the rest of the template end

   -- Check if we can recover a q-code 

local item, linkStr = p.qCode(place) if item then local wikidata = require("Module:Wikidata label") return wikidata._getLabel(item, lang, link) elseif linkStr then return linkStr -- no q-code but we matched one of the galleries or categories 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