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/*
** SWISH++
** token.h
**
** Copyright (C) 1998 Paul J. Lucas
**
** 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 2 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, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef token_H
#define token_H
// standard
#include <iostream.h>
// local
#include "config.h"
#include "fake_ansi.h"
//*****************************************************************************
//
// SYNOPSIS
//
class token
//
// DESCRIPTION
//
// This class is used to contain a parsed token from an input stream.
//
//*****************************************************************************
{
public:
enum type {
no_token,
word_token,
word_star_token,
and_token,
or_token,
not_token,
lparen_token,
rparen_token
};
token() : type_( no_token ) { }
explicit token( std::istream &in ) { in >> *this; }
operator type() const { return type_; }
int length() const { return len_; }
char const* str() const { return buf_; }
void put_back() { hold() = *this; on_hold_ = true; }
friend std::istream& operator>>( std::istream&, token& );
private:
type type_;
char buf_[ Word_Hard_Max_Size + 1 ];
int len_;
static bool on_hold_;
static token& hold();
};
#endif /* token_H */
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