Module:Is instance

local p = {};

local function checklayer(depth) -- check subclasses of items at current depth checklist[depth+1] = {} -- setup next layer of table local j = 0 for j = 1,#checklist[depth] do -- loop over items at current depth local property if depth == 1 then property = "P31" -- use P31 for depth 1 else property = "P279" -- use P279 for depths 2+ end local subclasses = mw.wikibase.getBestStatements(checklist[depth][j],property) -- get P31 or P279 statements for i,statement in ipairs(subclasses) do -- loop through items at next depth if statement.mainsnak.snaktype == 'value' then local newitem = statement.mainsnak.datavalue.value.id				if newitem == value then isInstance = true else checklist[depth+1][#checklist[depth+1]+1] = newitem -- add item to next depth of checklist table end end end end return isInstance end

function p.main(frame) local args = frame.args local pargs = frame:getParent.args value = args.value or pargs.value local qid = args.qid or pargs.qid or "" if qid == "" then qid = mw.wikibase.getEntityIdForCurrentPage end if not qid then return 0 end checklist = local md = args.maxdepth or pargs.maxdepth if md then maxdepth = tonumber(md) else maxdepth = 5 end depth = 0 -- current depth isInstance = false -- assume false until match found while not isInstance and depth<maxdepth do		depth = depth+1 checklayer(depth) end if not isInstance then depth = 0 -- indicates not isInstance end return depth -- return depth that item was found end

return p