1 files changed, 120 insertions, 0 deletions
diff --git a/Source/WebCore/style/StyleUpdate.cpp b/Source/WebCore/style/StyleUpdate.cpp
new file mode 100644
index 000000000..9b2cecb87
--- /dev/null
+++ b/Source/WebCore/style/StyleUpdate.cpp
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 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. 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 "StyleUpdate.h"
+
+#include "ComposedTreeAncestorIterator.h"
+#include "Document.h"
+#include "Element.h"
+#include "NodeRenderStyle.h"
+#include "RenderElement.h"
+#include "Text.h"
+
+namespace WebCore {
+namespace Style {
+
+Update::Update(Document& document)
+    : m_document(document)
+{
+}
+
+const ElementUpdate* Update::elementUpdate(const Element& element) const
+{
+    auto it = m_elements.find(&element);
+    if (it == m_elements.end())
+        return nullptr;
+    return &it->value;
+}
+
+ElementUpdate* Update::elementUpdate(const Element& element)
+{
+    auto it = m_elements.find(&element);
+    if (it == m_elements.end())
+        return nullptr;
+    return &it->value;
+}
+
+bool Update::textUpdate(const Text& text) const
+{
+    return m_texts.contains(&text);
+}
+
+const RenderStyle* Update::elementStyle(const Element& element) const
+{
+    if (auto* update = elementUpdate(element))
+        return update->style.get();
+    auto* renderer = element.renderer();
+    if (!renderer)
+        return nullptr;
+    return &renderer->style();
+}
+
+RenderStyle* Update::elementStyle(const Element& element)
+{
+    if (auto* update = elementUpdate(element))
+        return update->style.get();
+    auto* renderer = element.renderer();
+    if (!renderer)
+        return nullptr;
+    return &renderer->mutableStyle();
+}
+
+void Update::addElement(Element& element, Element* parent, ElementUpdate&& elementUpdate)
+{
+    ASSERT(!m_elements.contains(&element));
+    ASSERT(composedTreeAncestors(element).first() == parent);
+
+    addPossibleRoot(parent);
+    m_elements.add(&element, WTFMove(elementUpdate));
+}
+
+void Update::addText(Text& text, Element* parent)
+{
+    ASSERT(!m_texts.contains(&text));
+    ASSERT(composedTreeAncestors(text).first() == parent);
+
+    addPossibleRoot(parent);
+    m_texts.add(&text);
+}
+
+void Update::addText(Text& text)
+{
+    addText(text, composedTreeAncestors(text).first());
+}
+
+void Update::addPossibleRoot(Element* element)
+{
+    if (!element) {
+        m_roots.add(&m_document);
+        return;
+    }
+    if (m_elements.contains(element))
+        return;
+    m_roots.add(element);
+}
+
+}
+}