Merge ContentDistributor into ElementShadow

Source/core/dom/shadow/ScopeContentDistribution.cpp

Index: Source/core/dom/shadow/ScopeContentDistribution.cpp
diff --git a/Source/core/dom/shadow/ScopeContentDistribution.cpp b/Source/core/dom/shadow/ScopeContentDistribution.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..523898ac829d32b54d3f18e1beed16928e7fdf39
--- /dev/null
+++ b/Source/core/dom/shadow/ScopeContentDistribution.cpp
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2013 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#include "config.h"
+#include "core/dom/shadow/ScopeContentDistribution.h"
+
+#include "core/dom/NodeTraversal.h"
+#include "core/dom/shadow/InsertionPoint.h"
+#include "core/dom/shadow/ShadowRoot.h"
+#include "core/html/shadow/HTMLContentElement.h"
+#include "core/html/shadow/HTMLShadowElement.h"
+
+namespace WebCore {
+
+ScopeContentDistribution::ScopeContentDistribution()
+    : m_insertionPointAssignedTo(0)
+    , m_numberOfShadowElementChildren(0)
+    , m_numberOfContentElementChildren(0)
+    , m_numberOfElementShadowChildren(0)
+    , m_insertionPointListIsValid(false)
+{
+}
+
+void ScopeContentDistribution::setInsertionPointAssignedTo(PassRefPtr<InsertionPoint> insertionPoint)
+{
+    m_insertionPointAssignedTo = insertionPoint;
+}
+
+void ScopeContentDistribution::invalidateInsertionPointList()
+{
+    m_insertionPointListIsValid = false;
+    m_insertionPointList.clear();
+}
+
+const Vector<RefPtr<InsertionPoint> >& ScopeContentDistribution::ensureInsertionPointList(ShadowRoot* shadowRoot)
+{
+    if (m_insertionPointListIsValid)
+        return m_insertionPointList;
+
+    m_insertionPointListIsValid = true;
+    ASSERT(m_insertionPointList.isEmpty());
+
+    if (!shadowRoot->containsInsertionPoints())
+        return m_insertionPointList;
+
+    for (Element* element = ElementTraversal::firstWithin(shadowRoot); element; element = ElementTraversal::next(element, shadowRoot)) {
+        if (element->isInsertionPoint())
+            m_insertionPointList.append(toInsertionPoint(element));
+    }
+
+    return m_insertionPointList;
+}
+
+void ScopeContentDistribution::registerInsertionPoint(InsertionPoint* point)
+{
+    if (isHTMLShadowElement(point))
+        ++m_numberOfShadowElementChildren;
+    else if (isHTMLContentElement(point))
+        ++m_numberOfContentElementChildren;
+    else
+        ASSERT_NOT_REACHED();
+
+    invalidateInsertionPointList();
+}
+
+void ScopeContentDistribution::unregisterInsertionPoint(InsertionPoint* point)
+{
+    if (isHTMLShadowElement(point))
+        --m_numberOfShadowElementChildren;
+    else if (isHTMLContentElement(point))
+        --m_numberOfContentElementChildren;
+    else
+        ASSERT_NOT_REACHED();
+
+    ASSERT(m_numberOfContentElementChildren >= 0);
+    ASSERT(m_numberOfShadowElementChildren >= 0);
+
+    invalidateInsertionPointList();
+}
+
+} // namespace WebCore