Module:LuaExample

Documentation for this module may be created at Module:LuaExample/doc

local p = {}
local nw = require( 'mw.neowiki' )

function p.foundedYear( frame )
	local year = nw.getValue( 'Founded', { page = frame.args[1] } )
	return tostring( year or '' )
end

-- Only invoked from the SPARQL queries demo page, which is imported only into wikis with a
-- configured SPARQL store; elsewhere mw.neowiki.sparqlQuery is nil and calling this would error.
function p.largestMuseums( frame )
	local base = mw.site.server
	local result = nw.sparqlQuery(
		'SELECT ?label ?visitors WHERE { ' ..
		'?m <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <' .. base .. '/schema/Museum> . ' ..
		'?m <http://www.w3.org/2000/01/rdf-schema#label> ?label . ' ..
		'?m <' .. base .. '/prop/Annual_visitors> ?visitors ' ..
		'} ORDER BY DESC(?visitors) LIMIT 3'
	)

	local list = {}
	for _, binding in ipairs( result.results.bindings ) do
		list[#list + 1] = '* ' .. binding.label.value .. ' (' .. binding.visitors.value .. ' visitors)'
	end
	return table.concat( list, '\n' )
end

function p.oldestMuseums( frame )
	local rows = nw.query(
		'MATCH (m:Museum) RETURN m.name AS name, m.Founded AS year ORDER BY year LIMIT 3'
	)

	local list = {}
	for _, row in ipairs( rows ) do
		list[#list + 1] = '* ' .. row.name .. ' (' .. row.year .. ')'
	end
	return table.concat( list, '\n' )
end

return p