Difference between pages "Module:If empty" and "Module:If empty/sandbox"

(Difference between pages)

@@ Line 1: / Line 1: @@
-{{<includeonly>safesubst:</includeonly>#invoke:If empty|main}}<noinclude>{{Documentation}}</noinclude>
+local p = {}
+function p.main(frame)
+	local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false})
+	local lastk = 0
+	for k,v in ipairs(args) do
+		if v ~= '' then
+			return v
+		end
+		lastk = k
+	end
+	-- For backwards compatibility reasons, the first 8 parameters can be unset instead of being blank,
+	-- even though there's really no legitimate use case for this. At some point, this will be removed.
+	for i = lastk + 1, 9 do
+		if args[i] and args[i] ~= '' then
+			-- If any uses of this template depend on the behavior above, add them to a tracking category.
+			-- This is a rather fragile, convoluted, hacky way to do it, but it ensures that this module's output won't be modified
+			-- by it.
+			frame:extensionTag('ref', '[[Category:Instances of Template:If_empty missing arguments]]', {group = 'TrackingCategory'})
+			frame:extensionTag('references', '', {group = 'TrackingCategory'})
+			return args[i]
+		end
+	end
+end
+return p

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