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/*
* Copyright (c) 2015-2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* \brief: NFA Graph Builder: used by Glushkov construction to construct an
* NGHolder from a parsed expression.
*/
#ifndef NG_BUILDER_H
#define NG_BUILDER_H
#include "ue2common.h"
#include "parser/position.h"
#include "util/noncopyable.h"
#include <memory>
namespace ue2 {
class CharReach;
class ReportManager;
struct BuiltExpression;
struct CompileContext;
class ParsedExpression;
/** \brief Abstract builder interface. Use \ref makeNFABuilder to construct
* one. Used by GlushkovBuildState. */
class NFABuilder : noncopyable {
public:
virtual ~NFABuilder();
virtual Position makePositions(size_t nPositions) = 0;
virtual Position getStart() const = 0;
virtual Position getStartDotStar() const = 0;
virtual Position getAccept() const = 0;
virtual Position getAcceptEOD() const = 0;
virtual bool isSpecialState(Position p) const = 0;
virtual void setNodeReportID(Position position, int offsetAdjust) = 0;
virtual void addCharReach(Position position, const CharReach &cr) = 0;
/* or-in vertex assertions */
virtual void setAssertFlag(Position position, u32 flag) = 0;
virtual u32 getAssertFlag(Position position) = 0;
virtual void addVertex(Position p) = 0;
virtual void addEdge(Position start, Position end) = 0;
virtual bool hasEdge(Position start, Position end) const = 0;
virtual u32 numVertices() const = 0;
virtual void cloneRegion(Position first, Position last,
unsigned posOffset) = 0;
/**
* \brief Returns the built NGHolder graph and ExpressionInfo.
* Note that this builder cannot be used after this call.
*/
virtual BuiltExpression getGraph() = 0;
};
/** Construct a usable NFABuilder. */
std::unique_ptr<NFABuilder> makeNFABuilder(ReportManager &rm,
const CompileContext &cc,
const ParsedExpression &expr);
} // namespace ue2
#endif
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