webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 182 insertions, 0 deletions

diff --git a/Source/WebCore/contentextensions/ImmutableNFA.h b/Source/WebCore/contentextensions/ImmutableNFA.h
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+++ b/Source/WebCore/contentextensions/ImmutableNFA.h
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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.
+ */
+
+#pragma once
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include <wtf/Vector.h>
+
+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 ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)