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diff --git a/src/sexpr/parser.hpp b/src/sexpr/parser.hpp
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+#ifndef TMWA_SEXPR_PARSER_HPP
+#define TMWA_SEXPR_PARSER_HPP
+//    parser.hpp - build a tree 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/zstring.hpp"
+
+# include "../io/line.hpp"
+
+# include "lexer.hpp"
+
+namespace sexpr
+{
+    enum Type
+    {
+        LIST,
+        INT,
+        STRING,
+        TOKEN,
+    };
+
+    struct SExpr
+    {
+        Type _type;
+        int64_t _int;
+        RString _str;
+        std::vector<SExpr> _list;
+
+        io::LineSpan _span;
+
+        SExpr() : _type(), _int(), _str(), _list(), _span() {}
+    };
+
+    inline
+    bool operator == (const SExpr& l, const SExpr& r)
+    {
+        if (l._type != r._type)
+            return false;
+        switch (l._type)
+        {
+        case LIST:
+            return l._list == r._list;
+        case INT:
+            return l._int == r._int;
+        case STRING:
+        case TOKEN:
+            return l._str == r._str;
+        }
+        abort();
+    }
+    inline
+    bool operator != (const SExpr& l, const SExpr& r)
+    {
+        return !(l == r);
+    }
+
+    bool token_is_int(ZString s, int64_t& out, bool& ok);
+    /// return false on error or eof, check lex.peek() == TOK_EOF to see
+    bool parse(Lexer& lex, SExpr& out);
+} // namespace sexpr
+
+#endif // TMWA_SEXPR_PARSER_HPP