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/* $Id$
*
* Abstract base class for all nodes of the abstract syntax tree.
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#ifndef __AST_NODE_HPP_INCLUDED
#define __AST_NODE_HPP_INCLUDED
#include <ostream>
#include "frontend/visitor/Visitor.hpp"
#include "frontend/ast/Location.hpp"
#include "util/MiscUtil.hpp"
#include "util/GarbageCollect.hpp"
namespace ast {
//! This is the abstract base class for all AST Nodes.
/** All AST nodes need to derive from this class
*/
class AstNode : public util::GarbageCollect {
public:
//! c'tor
/** @param loc source code location of the AST node. */
AstNode(Location loc) : location(loc), number(-1) {}
//! Accept a Visitor.
/** All leaf AST nodes need to implement this method.
*
* @param visitor the Visitor that can visit this node.
*/
virtual void accept(Visitor& visitor) = 0;
/** Put a textual representation of the AstNode on the stream.
* @param stream stream to put the textual representation to.
*/
virtual void put(std::ostream &stream) const = 0;
/** source location of the AST node. */
Location location;
/** unique node number for Dot graphs */
int number;
protected:
/** d'tor, not used in this interface. */
virtual ~AstNode() {}
};
/** operator to write node to a stream.
*
* @param stream stream to write the node to.
* @param node node that should get written to stream.
* @return modified stream.
*/
std::ostream&
operator<<(std::ostream &stream, const AstNode &node);
/** operator to write node to a stream.
*
* @param stream stream to write the node to.
* @param node node that should get written to stream. If NULL, (null) gets
* written.
* @return modified stream.
*/
std::ostream&
operator<<(std::ostream &stream, const AstNode *node);
}; /* namespace ast */
#endif /* __AST_NODE_HPP_INCLUDED */
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