1 files changed, 156 insertions, 0 deletions
diff --git a/Source/WebCore/contentextensions/ContentExtension.cpp b/Source/WebCore/contentextensions/ContentExtension.cpp
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+++ b/Source/WebCore/contentextensions/ContentExtension.cpp
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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.
+ */
+
+#include "config.h"
+#include "ContentExtension.h"
+
+#include "CompiledContentExtension.h"
+#include "ContentExtensionsBackend.h"
+#include "StyleSheetContents.h"
+#include <wtf/text/StringBuilder.h>
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+namespace WebCore {
+namespace ContentExtensions {
+
+RefPtr<ContentExtension> ContentExtension::create(const String& identifier, Ref<CompiledContentExtension>&& compiledExtension)
+{
+    return adoptRef(*new ContentExtension(identifier, WTFMove(compiledExtension)));
+}
+
+ContentExtension::ContentExtension(const String& identifier, Ref<CompiledContentExtension>&& compiledExtension)
+    : m_identifier(identifier)
+    , m_compiledExtension(WTFMove(compiledExtension))
+{
+    DFABytecodeInterpreter withoutDomains(m_compiledExtension->filtersWithoutDomainsBytecode(), m_compiledExtension->filtersWithoutDomainsBytecodeLength());
+    DFABytecodeInterpreter withDomains(m_compiledExtension->filtersWithDomainsBytecode(), m_compiledExtension->filtersWithDomainsBytecodeLength());
+    for (uint64_t action : withoutDomains.actionsMatchingEverything()) {
+        ASSERT(static_cast<uint32_t>(action) == action);
+        m_universalActionsWithoutDomains.append(static_cast<uint32_t>(action));
+    }
+    for (uint64_t action : withDomains.actionsMatchingEverything()) {
+        ASSERT((action & ~IfDomainFlag) == static_cast<uint32_t>(action));
+        m_universalActionsWithDomains.append(action);
+    }
+    
+    compileGlobalDisplayNoneStyleSheet();
+    m_universalActionsWithoutDomains.shrinkToFit();
+    m_universalActionsWithDomains.shrinkToFit();
+}
+
+uint32_t ContentExtension::findFirstIgnorePreviousRules() const
+{
+    auto* actions = m_compiledExtension->actions();
+    uint32_t actionsLength = m_compiledExtension->actionsLength();
+    uint32_t currentActionIndex = 0;
+    while (currentActionIndex < actionsLength) {
+        if (Action::deserializeType(actions, actionsLength, currentActionIndex) == ActionType::IgnorePreviousRules)
+            return currentActionIndex;
+        currentActionIndex += Action::serializedLength(actions, actionsLength, currentActionIndex);
+    }
+    return std::numeric_limits<uint32_t>::max();
+}
+    
+StyleSheetContents* ContentExtension::globalDisplayNoneStyleSheet()
+{
+    return m_globalDisplayNoneStyleSheet.get();
+}
+
+void ContentExtension::compileGlobalDisplayNoneStyleSheet()
+{
+    uint32_t firstIgnorePreviousRules = findFirstIgnorePreviousRules();
+    
+    auto* actions = m_compiledExtension->actions();
+    uint32_t actionsLength = m_compiledExtension->actionsLength();
+
+    auto inGlobalDisplayNoneStyleSheet = [&](const uint32_t location)
+    {
+        return location < firstIgnorePreviousRules && Action::deserializeType(actions, actionsLength, location) == ActionType::CSSDisplayNoneSelector;
+    };
+    
+    StringBuilder css;
+    for (uint32_t universalActionLocation : m_universalActionsWithoutDomains) {
+        if (inGlobalDisplayNoneStyleSheet(universalActionLocation)) {
+            if (!css.isEmpty())
+                css.append(',');
+            Action action = Action::deserialize(actions, actionsLength, universalActionLocation);
+            ASSERT(action.type() == ActionType::CSSDisplayNoneSelector);
+            css.append(action.stringArgument());
+        }
+    }
+    if (css.isEmpty())
+        return;
+    css.append("{");
+    css.append(ContentExtensionsBackend::displayNoneCSSRule());
+    css.append("}");
+
+    m_globalDisplayNoneStyleSheet = StyleSheetContents::create();
+    m_globalDisplayNoneStyleSheet->setIsUserStyleSheet(true);
+    if (!m_globalDisplayNoneStyleSheet->parseString(css.toString()))
+        m_globalDisplayNoneStyleSheet = nullptr;
+
+    // These actions don't need to be applied individually any more. They will all be applied to every page as a precompiled style sheet.
+    m_universalActionsWithoutDomains.removeAllMatching(inGlobalDisplayNoneStyleSheet);
+}
+
+void ContentExtension::populateDomainCacheIfNeeded(const String& domain)
+{
+    if (m_cachedDomain != domain) {
+        DFABytecodeInterpreter interpreter(m_compiledExtension->domainFiltersBytecode(), m_compiledExtension->domainFiltersBytecodeLength());
+        const uint16_t allLoadTypesAndResourceTypes = LoadTypeMask | ResourceTypeMask;
+        auto domainActions = interpreter.interpret(domain.utf8(), allLoadTypesAndResourceTypes);
+        
+        m_cachedDomainActions.clear();
+        for (uint64_t action : domainActions)
+            m_cachedDomainActions.add(action);
+        
+        m_cachedUniversalDomainActions.clear();
+        for (uint64_t action : m_universalActionsWithDomains) {
+            ASSERT_WITH_MESSAGE((action & ~IfDomainFlag) == static_cast<uint32_t>(action), "Universal actions with domains should not have flags.");
+            if (!!(action & IfDomainFlag) == m_cachedDomainActions.contains(action))
+                m_cachedUniversalDomainActions.append(static_cast<uint32_t>(action));
+        }
+        m_cachedUniversalDomainActions.shrinkToFit();
+        m_cachedDomain = domain;
+    }
+}
+
+const DFABytecodeInterpreter::Actions& ContentExtension::cachedDomainActions(const String& domain)
+{
+    populateDomainCacheIfNeeded(domain);
+    return m_cachedDomainActions;
+}
+
+const Vector<uint32_t>& ContentExtension::universalActionsWithDomains(const String& domain)
+{
+    populateDomainCacheIfNeeded(domain);
+    return m_cachedUniversalDomainActions;
+}
+    
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)