Helpers: Add Normalizer to normalize street names in addresses

Elwig/Helpers/Validator.cs

@@ -711,5 +711,25 @@ namespace Elwig.Helpers {
 
             return new(true, null);
         }
+
+        public static ValidationResult CheckAddress(TextBox input, bool required, string? locality = null) {
+            var text = input.Text;
+            var (name, nr) = Utils.SplitAddress(text);
+            if (!string.IsNullOrWhiteSpace(nr)) {
+                var street = Normalizer.NormalizeStreetName(name.Replace(",", ""), locality);
+                var idx = input.CaretIndex;
+                input.Text = $"{street} {nr}".Trim();
+                if (idx >= (text.Length - nr.Length)) {
+                    input.CaretIndex = street.Length + (idx - (text.Length - nr.Length)) + 1;
+                } else if (idx > 0) {
+                    input.CaretIndex = idx;
+                }
+            }
+
+            if (text.Length == 0)
+                return required ? new(false, "Adresse ist nicht optional") : new(true, null);
+
+            return new(true, null);
+        }
     }
 }