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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.
*/
#ifndef RDFA_H
#define RDFA_H
#include "nfa_kind.h"
#include "ue2common.h"
#include "util/flat_containers.h"
#include <array>
#include <vector>
namespace ue2 {
typedef u16 dstate_id_t;
typedef u16 symbol_t;
static constexpr symbol_t TOP = 256;
static constexpr symbol_t ALPHABET_SIZE = 257;
static constexpr symbol_t N_SPECIAL_SYMBOL = 1;
static constexpr dstate_id_t DEAD_STATE = 0;
/** Structure representing a dfa state during construction. */
struct dstate {
/** Next state; indexed by remapped sym */
std::vector<dstate_id_t> next;
/** Set by ng_mcclellan, refined by mcclellancompile */
dstate_id_t daddy = 0;
/** Set by mcclellancompile, implementation state id, excludes edge
* decorations */
dstate_id_t impl_id = 0;
/** Reports to fire (at any location). */
flat_set<ReportID> reports;
/** Reports to fire (at EOD). */
flat_set<ReportID> reports_eod;
explicit dstate(size_t alphabet_size) : next(alphabet_size, 0) {}
};
struct raw_dfa {
nfa_kind kind;
std::vector<dstate> states;
dstate_id_t start_anchored = DEAD_STATE;
dstate_id_t start_floating = DEAD_STATE;
u16 alpha_size = 0; /* including special symbols */
/* mapping from input symbol --> equiv class id */
std::array<u16, ALPHABET_SIZE> alpha_remap;
explicit raw_dfa(nfa_kind k) : kind(k) {}
virtual ~raw_dfa();
u16 getImplAlphaSize() const { return alpha_size - N_SPECIAL_SYMBOL; }
virtual void stripExtraEodReports(void);
bool hasEodReports(void) const;
};
}
#endif
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