Source: ../../policy/code_generator.hh
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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// vim:set sts=4 ts=8:
// Copyright (c) 2001-2005 International Computer Science Institute
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software")
// to deal in the Software without restriction, subject to the conditions
// listed in the XORP LICENSE file. These conditions include: you must
// preserve this copyright notice, and you cannot mention the copyright
// holders in advertising related to the Software without their permission.
// The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
// notice is a summary of the XORP LICENSE file; the license in that file is
// legally binding.
// $XORP: xorp/policy/code_generator.hh,v 1.4 2005/10/02 22:21:50 abittau Exp $
#ifndef __POLICY_CODE_GENERATOR_HH__
#define __POLICY_CODE_GENERATOR_HH__
#include "policy/common/varrw.hh"
#include "policy/common/policy_exception.hh"
#include "var_map.hh"
#include "visitor.hh"
#include "code.hh"
#include "policy_statement.hh"
#include "node.hh"
#include <sstream>
#include <string>
/**
* @short Generic code generator. It is suitable for import filters.
*
* This class visits a structure of Nodes and generates appropriate code.
*/
class CodeGenerator : public Visitor {
public:
/**
* @short Exception thrown if code generation fails.
*
* This may occur for example, if an import policy has a dest part. The
* semantic check should however get rid of all errors.
*/
class CodeGeneratorErr : public PolicyException {
public:
CodeGeneratorErr(const string& err) : PolicyException(err) {}
};
CodeGenerator(const VarMap& varmap); // used by source match code generator.
/**
* Generate code for a specific protocol and filter [target]/
*
* This construct is mainly used by derived classes to set the code target.a
*
* @param proto target protocol.
* @param filter target filter type.
* @param varmap varmap.
*/
CodeGenerator(const string& proto, const filter::Filter& filter,
const VarMap& varmap);
/**
* Initialize code generation for an import of a specific protocol.
*
* @param proto target protocol.
* @param varmap varmap.
*/
CodeGenerator(const string& proto, const VarMap& varmap);
virtual ~CodeGenerator();
const Element* visit(NodeUn& node);
const Element* visit(NodeBin& node);
const Element* visit(NodeAssign& node);
const Element* visit(NodeElem& node);
const Element* visit(NodeVar& node);
const Element* visit(NodeSet& node);
const Element* visit(NodeAccept& node);
const Element* visit(NodeReject& node);
const Element* visit(PolicyStatement& policy);
const Element* visit(Term& policy);
const Element* visit(NodeProto& policy);
/**
* @return code generated.
*/
const Code& code();
protected:
// may not overload virtual functions =(
// yes it is a triple dispatch... but we will get there eventually =D
virtual const Element* visit_policy(PolicyStatement& policy);
virtual const Element* visit_term(Term& term);
virtual const Element* visit_proto(NodeProto& node);
virtual const string& protocol();
Code _code;
ostringstream _os;
const VarMap& _varmap;
private:
string _protocol;
};
#endif // __POLICY_CODE_GENERATOR_HH__
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