From fe3d4ce758822d65a0a5d617b7b77df2dbc972d8 Mon Sep 17 00:00:00 2001
From: Ben Longbons <b.r.longbons@gmail.com>
Date: Sun, 16 Mar 2014 14:55:57 -0700
Subject: Implement new magic frontend using sexpr

---
 src/sexpr/lexer.hpp | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/sexpr/lexer.hpp

(limited to 'src/sexpr/lexer.hpp')

diff --git a/src/sexpr/lexer.hpp b/src/sexpr/lexer.hpp
new file mode 100644
index 0000000..7bce620
--- /dev/null
+++ b/src/sexpr/lexer.hpp
@@ -0,0 +1,73 @@
+#ifndef TMWA_SEXPR_LEXER_HPP
+#define TMWA_SEXPR_LEXER_HPP
+//    lexer.hpp - tokenize a stream of S-expressions
+//
+//    Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# include "../sanity.hpp"
+
+# include "../strings/astring.hpp"
+# include "../strings/vstring.hpp"
+# include "../strings/xstring.hpp"
+# include "../strings/zstring.hpp"
+
+# include "../io/line.hpp"
+
+namespace sexpr
+{
+    enum Lexeme
+    {
+        TOK_EOF = 0,
+        TOK_ERROR,
+        TOK_OPEN,
+        TOK_CLOSE,
+        TOK_STRING,
+        TOK_TOKEN,
+    };
+
+    class Lexer
+    {
+        io::LineCharReader _in;
+        Lexeme _current;
+        AString _string;
+        io::LineSpan _span;
+        std::vector<io::LineChar> _depth;
+    private:
+        Lexeme _adv();
+    public:
+        explicit
+        Lexer(ZString filename)
+        : _in(filename), _current(TOK_EOF), _span(), _depth()
+        { adv(); }
+        // for unit tests
+        Lexer(ZString fake, io::FD fd)
+        : _in(fake, fd), _current(TOK_EOF), _span(), _depth()
+        { adv(); }
+        Lexeme peek() { return _current; }
+        void adv() { _current = _adv(); }
+        ZString val_string() { return _string; }
+        io::LineSpan span() { return _span; }
+    };
+
+    VString<4> escape(char c);
+    AString escape(XString s);
+
+    ZString token_name(Lexeme tok);
+} // namespace sexpr
+
+#endif // TMWA_SEXPR_LEXER_HPP
-- 
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