1 files changed, 67 insertions, 0 deletions
diff --git a/parser.hpp b/parser.hpp
new file mode 100644
index 0000000..65f2686
--- /dev/null
+++ b/parser.hpp
@@ -0,0 +1,67 @@
+/**
+ * lisp-compiler: Compiles LISP using LLVM.
+ * Copyright (C) 2022  Clyne Sullivan
+ *
+ * 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, 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 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/>.
+ *
+ * @file parser.hpp
+ * @brief Source code parser to produce AST.
+ */
+
+#ifndef PARSER_HPP
+#define PARSER_HPP
+
+#include "ast.hpp"
+#include "state.hpp"
+
+#include <deque>
+#include <optional>
+#include <string>
+#include <variant>
+
+class Parser {
+public:
+    enum Error {
+        None,
+        ExpectedProcedure,
+        ExpectedIdentifier,
+        ExpectedProcedureCallClose,
+        ExpectedArgumentList,
+        UnknownIdentifier,
+        InvalidOperator,
+        InvalidOperand,
+    };
+
+    void addString(const std::string& str);
+
+    void consumeWhitespace();
+    std::optional<std::string> consumeIdentifier();
+    std::optional<std::variant<int, double>> consumeLiteralNumber();
+
+    AST::Node *parse(CompilerState&);
+
+private:
+    std::deque<char> text;
+    Error lastError = None;
+
+    AST::Node *parseExpression();
+    AST::Node *parseProcedureCall();
+    AST::Node *parseConditional();
+    AST::Node *parseDefinition();
+    AST::Node *parseAssignment();
+    AST::Node *parseLambdaExpression();
+};
+
+#endif // PARSER_HPP
+