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diff --git a/src/lexer.hh b/src/lexer.hh
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+// This file is part of Cait <https://github.com/Fuwn/cait>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3.
+//
+// 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
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#ifndef LEXER_HH
+#define LEXER_HH
+
+#include <cstdint>
+#include <fstream>
+#include <sstream>
+#include <string>
+
+#include "token.hh"
+
+namespace cait {
+
+class lexer {
+private:
+  token_tree _tree;
+  std::vector<std::string> _lines;
+
+public:
+  explicit lexer(std::ifstream &);
+  auto tree() -> token_tree &;
+  auto lines() -> const std::vector<std::string> &;
+};
+
+} // namespace cait
+
+#endif // LEXER_HH