Module:Yesno: Difference between revisions

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+-- Function allowing for consistent treatment of boolean-like wikitext input.
+-- It works similarly to the template {{yesno}}.
+return function (val, default)
+	-- If your wiki uses non-ascii characters for any of "yes", "no", etc., you
+	-- should replace "val:lower()" with "mw.ustring.lower(val)" in the
+	-- following line.
+	val = type(val) == 'string' and val:lower() or val
+	if val == nil then
+		return nil
+	elseif val == true
+		or val == 'yes'
+		or val == 'y'
+		or val == 'true'
+		or val == 't'
+		or tonumber(val) == 1
+	then
+		return true
+	elseif val == false
+		or val == 'no'
+		or val == 'n'
+		or val == 'false'
+		or val == 'f'
+		or tonumber(val) == 0
+	then
+		return false
+	else
+		return default
+	end
+end

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