/* 
 * 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 
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 */ 
 
#ifndef SLOT_MANAGER_INTERNAL_H 
#define SLOT_MANAGER_INTERNAL_H 
 
#include "nfagraph/ng.h" 
#include "nfagraph/ng_is_equal.h" 
#include "util/charreach.h" 
#include "ue2common.h" 
 
#include <memory> 
#include <unordered_map>
#include <unordered_set>
#include <vector> 
 
namespace ue2 { 
 
struct InitialResetEntry { 
    InitialResetEntry(std::shared_ptr<const NGHolder> sent_in, 
                      std::shared_ptr<const NGHolder> body_in, 
                      const std::unordered_map<NFAVertex, u32> &body_regions_in,
                      u32 sent_region_in, u32 first_bad_region_in) 
        : sent(sent_in), body(body_in), body_regions(body_regions_in), 
          sent_region(sent_region_in), first_bad_region(first_bad_region_in) {} 
 
    std::shared_ptr<const NGHolder> sent; 
    std::shared_ptr<const NGHolder> body; 
    std::unordered_map<NFAVertex, u32> body_regions;
    u32 sent_region; 
    u32 first_bad_region; /* ~0U if it must cover the whole g */ 
}; 
 
struct InitialResetInfo { 
    explicit InitialResetInfo(u32 slot_in) : slot(slot_in) {} 
 
    std::vector<InitialResetEntry> entries; 
    u32 slot; 
}; 
 
struct SlotCacheEntry { 
    // We store our own copy of the prefix so we control its lifetime. A 
    // pointer is used so that this entry can be placed in STL containers, as 
    // NGHolder is not copy-constructible. 
    SlotCacheEntry(const NGHolder &prefix_in, const CharReach &escapes_in, 
                   u32 parent_in, bool is_reset_in, u32 slot_in); 
 
    std::unique_ptr<const NGHolder> prefix; 
    CharReach escapes; 
    u32 parent_slot; 
    bool is_reset; 
    u32 slot; 
}; 
 
struct SlotEntryHasher { 
    size_t operator()(const SlotCacheEntry &e) const; 
}; 
 
struct SlotEntryEqual { 
    bool operator()(const SlotCacheEntry &a, const SlotCacheEntry &b) const; 
}; 
 
struct SlotCache { 
    typedef std::unordered_set<SlotCacheEntry, SlotEntryHasher,
                               SlotEntryEqual> CacheStore; 
 
    void insert(const NGHolder &prefix, const CharReach &escapes, 
                u32 parent_slot, bool is_reset, u32 slot); 
 
    const SlotCacheEntry *find(const NGHolder &prefix, const CharReach &escapes, 
                               u32 parent_slot, bool is_reset); 
 
    CacheStore store; 
 
    std::unordered_set<std::shared_ptr<const NGHolder>, NGHolderHasher,
                  NGHolderEqual> initial_prefixes;
    std::vector<InitialResetInfo> initial_resets; 
}; 
 
} // namespace ue2 
 
#endif