1 files changed, 120 insertions, 0 deletions
diff --git a/Source/WebCore/style/StyleTreeResolver.h b/Source/WebCore/style/StyleTreeResolver.h
new file mode 100644
index 000000000..df5f861f3
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+++ b/Source/WebCore/style/StyleTreeResolver.h
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+/*
+ * Copyright (C) 2013-2016 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. ``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
+ * 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
+
+#include "RenderStyleConstants.h"
+#include "RenderTreePosition.h"
+#include "SelectorChecker.h"
+#include "SelectorFilter.h"
+#include "StyleChange.h"
+#include "StyleSharingResolver.h"
+#include "StyleUpdate.h"
+#include "StyleValidity.h"
+#include <wtf/Function.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class Document;
+class Element;
+class Node;
+class RenderStyle;
+class ShadowRoot;
+class StyleResolver;
+
+namespace Style {
+
+class TreeResolver {
+public:
+    TreeResolver(Document&);
+    ~TreeResolver();
+
+    std::unique_ptr<Update> resolve(Change);
+
+    static ElementUpdate createAnimatedElementUpdate(std::unique_ptr<RenderStyle>, Element&, Change parentChange);
+
+private:
+    std::unique_ptr<RenderStyle> styleForElement(Element&, const RenderStyle& inheritedStyle);
+
+    void resolveComposedTree();
+    ElementUpdate resolveElement(Element&);
+
+    struct Scope : RefCounted<Scope> {
+        StyleResolver& styleResolver;
+        SelectorFilter selectorFilter;
+        SharingResolver sharingResolver;
+        ShadowRoot* shadowRoot { nullptr };
+        Scope* enclosingScope { nullptr };
+
+        Scope(Document&);
+        Scope(ShadowRoot&, Scope& enclosingScope);
+    };
+
+    struct Parent {
+        Element* element;
+        const RenderStyle& style;
+        Change change;
+        bool didPushScope { false };
+        bool elementNeedingStyleRecalcAffectsNextSiblingElementStyle { false };
+
+        Parent(Document&, Change);
+        Parent(Element&, const RenderStyle&, Change);
+    };
+
+    Scope& scope() { return m_scopeStack.last(); }
+    Parent& parent() { return m_parentStack.last(); }
+
+    void pushScope(ShadowRoot&);
+    void pushEnclosingScope();
+    void popScope();
+
+    void pushParent(Element&, const RenderStyle&, Change);
+    void popParent();
+    void popParentsToDepth(unsigned depth);
+
+    const RenderStyle* parentBoxStyle() const;
+
+    Document& m_document;
+    std::unique_ptr<RenderStyle> m_documentElementStyle;
+
+    Vector<Ref<Scope>, 4> m_scopeStack;
+    Vector<Parent, 32> m_parentStack;
+
+    std::unique_ptr<Update> m_update;
+};
+
+void queuePostResolutionCallback(Function<void ()>&&);
+bool postResolutionCallbacksAreSuspended();
+
+class PostResolutionCallbackDisabler {
+public:
+    explicit PostResolutionCallbackDisabler(Document&);
+    ~PostResolutionCallbackDisabler();
+};
+
+}
+
+}