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+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023  Clyne Sullivan <clyne@bitgloo.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALEEFORTH_TYPES_HPP
+#define ALEEFORTH_TYPES_HPP
+
+#include <cstdint>
+#include <string_view>
+
+struct State;
+
+using Addr = uint16_t;
+using Cell = int16_t;
+using Func = int (*)(State&);
+
+enum class Pass
+{
+    None,
+    Comment,
+    Colon,
+    Constant
+};
+
+enum class ParseStatus
+{
+    Finished,
+    Continue,
+    Error
+};
+
+std::string_view to_string(ParseStatus ps);
+
+#endif // ALEEFORTH_TYPES_HPP
+