Helpers: Add Normalizer to normalize street names in addresses

Elwig/Helpers/AppDbContext.cs

@@ -170,16 +170,25 @@ namespace Elwig.Helpers {
             SavedChanges += OnSavedChanges;
         }
 
+        private static void CreateFunctions(SqliteConnection cnx) {
+            cnx.CreateFunction<string, string?, bool?>("REGEXP", (pattern, value) => {
+                return value == null ? null : Regex.IsMatch(value, pattern);
+            }, true);
+            cnx.CreateFunction<string?, string?, string?>("NORMALIZE_ADDRESS", (address, locality) => {
+                return string.IsNullOrWhiteSpace(address) ? null : Normalizer.NormalizeAddress(address, locality);
+            }, true);
+        }
+
         public static SqliteConnection Connect(string? connectionString = null) {
             var cnx = new SqliteConnection(connectionString ?? ConnectionString);
-            cnx.CreateFunction<string, string?, bool?>("REGEXP", (pattern, value) => value == null ? null : Regex.Match(value, pattern).Success, true);
+            CreateFunctions(cnx);
             cnx.Open();
             return cnx;
         }
 
         public static async Task<SqliteConnection> ConnectAsync(string? connectionString = null) {
             var cnx = new SqliteConnection(connectionString ?? ConnectionString);
-            cnx.CreateFunction<string, string?, bool?>("REGEXP", (pattern, value) => value == null ? null : Regex.Match(value, pattern).Success, true);
+            CreateFunctions(cnx);
             await cnx.OpenAsync();
             return cnx;
         }