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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 ImmutableNFA_h
#define ImmutableNFA_h
#include <wtf/Vector.h>
#if ENABLE(CONTENT_EXTENSIONS)
namespace WebCore {
namespace ContentExtensions {
template <typename CharacterType>
struct ImmutableRange {
uint32_t targetStart;
uint32_t targetEnd;
CharacterType first;
CharacterType last;
};
struct ImmutableNFANode {
uint32_t rangesStart { 0 };
uint32_t rangesEnd { 0 };
uint32_t epsilonTransitionTargetsStart { 0 };
uint32_t epsilonTransitionTargetsEnd { 0 };
uint32_t actionStart { 0 };
uint32_t actionEnd { 0 };
};
template <typename CharacterType, typename ActionType>
struct ImmutableNFA {
Vector<ImmutableNFANode, 0, ContentExtensionsOverflowHandler> nodes;
Vector<ImmutableRange<CharacterType>, 0, ContentExtensionsOverflowHandler> transitions;
Vector<uint32_t, 0, ContentExtensionsOverflowHandler> targets;
Vector<uint32_t, 0, ContentExtensionsOverflowHandler> epsilonTransitionsTargets;
Vector<ActionType, 0, ContentExtensionsOverflowHandler> actions;
struct ConstTargetIterator {
const ImmutableNFA& immutableNFA;
uint32_t position;
const uint32_t& operator*() const { return immutableNFA.targets[position]; }
const uint32_t* operator->() const { return &immutableNFA.targets[position]; }
bool operator==(const ConstTargetIterator& other) const
{
ASSERT(&immutableNFA == &other.immutableNFA);
return position == other.position;
}
bool operator!=(const ConstTargetIterator& other) const { return !(*this == other); }
ConstTargetIterator& operator++()
{
++position;
return *this;
}
};
struct IterableConstTargets {
const ImmutableNFA& immutableNFA;
uint32_t targetStart;
uint32_t targetEnd;
ConstTargetIterator begin() const { return { immutableNFA, targetStart }; }
ConstTargetIterator end() const { return { immutableNFA, targetEnd }; }
};
struct ConstRangeIterator {
const ImmutableNFA& immutableNFA;
uint32_t position;
bool operator==(const ConstRangeIterator& other) const
{
ASSERT(&immutableNFA == &other.immutableNFA);
return position == other.position;
}
bool operator!=(const ConstRangeIterator& other) const { return !(*this == other); }
ConstRangeIterator& operator++()
{
++position;
return *this;
}
CharacterType first() const
{
return range().first;
}
CharacterType last() const
{
return range().last;
}
IterableConstTargets data() const
{
const ImmutableRange<CharacterType>& range = this->range();
return { immutableNFA, range.targetStart, range.targetEnd };
};
private:
const ImmutableRange<CharacterType>& range() const
{
return immutableNFA.transitions[position];
}
};
struct IterableConstRange {
const ImmutableNFA& immutableNFA;
uint32_t rangesStart;
uint32_t rangesEnd;
ConstRangeIterator begin() const { return { immutableNFA, rangesStart }; }
ConstRangeIterator end() const { return { immutableNFA, rangesEnd }; }
#if CONTENT_EXTENSIONS_STATE_MACHINE_DEBUGGING
void debugPrint() const
{
for (const auto& range : *this)
WTFLogAlways(" %d-%d", range.first, range.last);
}
#endif
};
IterableConstRange transitionsForNode(uint32_t nodeId) const
{
const ImmutableNFANode& node = nodes[nodeId];
return { *this, node.rangesStart, node.rangesEnd };
};
uint32_t root() const
{
RELEASE_ASSERT(!nodes.isEmpty());
return 0;
}
void finalize()
{
nodes.shrinkToFit();
transitions.shrinkToFit();
targets.shrinkToFit();
epsilonTransitionsTargets.shrinkToFit();
actions.shrinkToFit();
}
size_t memoryUsed() const
{
return nodes.capacity() * sizeof(ImmutableNFANode)
+ transitions.capacity() * sizeof(ImmutableRange<CharacterType>)
+ targets.capacity() * sizeof(uint32_t)
+ epsilonTransitionsTargets.capacity() * sizeof(uint32_t)
+ actions.capacity() * sizeof(ActionType);
}
};
}
} // namespace WebCore
#endif // ENABLE(CONTENT_EXTENSIONS)
#endif // ImmutableNFA_h
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