fix #1468 #6 #1329: Реализация оператора Перейти / Goto

src/ScriptEngine/Compiler/CodeGeneratorPrivateTypes.cs

@@ -42,5 +42,35 @@ public static NestedLoopInfo New()
             public List<int> breakStatements;
             public int tryNesting;
         }
+
+        private enum BlockType
+        {
+            While,
+            ForEach,
+            For,
+            If,
+            ElseIf,
+            Else,
+            Try,
+            Except
+        }
+
+        private class LabelInfo
+        {
+            public int codeIndex = DUMMY_ADDRESS;
+            public List<(BlockType type, int id)> blockStack;
+            public int tryNesting;
+        }
+
+        private struct PendingGoto
+        {
+            public int commandIndex;
+            public int exitTryIndex;
+            public string labelName;
+            public List<(BlockType type, int id)> blockStack;
+            public List<(int commandIndex, BlockType loopType, int blockId)> loopCleanupSlots;
+            public CodeRange location;
+            public int tryNesting;
+        }
     }
 }

src/ScriptEngine/Compiler/CompilerErrors.cs

@@ -29,6 +29,18 @@ public static CodeError MissedImport(string symbol, string libName) =>
             Create($"Свойство {symbol} принадлежит пакету {libName}, который не импортирован в данном модуле",
                 $"Property {symbol} belongs to package {libName} which is not imported in this module");
 
+        public static CodeError DuplicateLabelDefinition(string name) =>
+            Create($"Дублирование определения метки ~{name}",
+                   $"Duplicate label definition ~{name}");
+
+        public static CodeError UndefinedLabel(string name) =>
+            Create($"Метка не определена ~{name}",
+                   $"Undefined label ~{name}");
+
+        public static CodeError InvalidGotoTarget(string name) =>
+            Create($"На метку с указанным именем имеется недопустимый переход (~{name})",
+                   $"Invalid goto target (~{name})");
+
         private static CodeError Create(string ru, string en, [CallerMemberName] string errorId = default)
         {
             return new CodeError