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#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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