webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 161 insertions, 0 deletions

diff --git a/Source/WebCore/style/RenderTreePosition.cpp b/Source/WebCore/style/RenderTreePosition.cpp
new file mode 100644
index 000000000..2b90d6847
--- /dev/null
+++ b/Source/WebCore/style/RenderTreePosition.cpp
@@ -0,0 +1,161 @@
+/*
+ * 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 "RenderTreePosition.h"
+
+#include "ComposedTreeIterator.h"
+#include "FlowThreadController.h"
+#include "PseudoElement.h"
+#include "RenderObject.h"
+#include "ShadowRoot.h"
+
+namespace WebCore {
+
+void RenderTreePosition::computeNextSibling(const Node& node)
+{
+    ASSERT(!node.renderer());
+    if (m_hasValidNextSibling) {
+#if !ASSERT_DISABLED
+        const unsigned oNSquaredAvoidanceLimit = 20;
+        bool skipAssert = m_parent.isRenderView() || ++m_assertionLimitCounter > oNSquaredAvoidanceLimit;
+        ASSERT(skipAssert || nextSiblingRenderer(node) == m_nextSibling);
+#endif
+        return;
+    }
+    m_nextSibling = nextSiblingRenderer(node);
+    m_hasValidNextSibling = true;
+}
+
+void RenderTreePosition::invalidateNextSibling(const RenderObject& siblingRenderer)
+{
+    if (!m_hasValidNextSibling)
+        return;
+    if (m_nextSibling == &siblingRenderer)
+        m_hasValidNextSibling = false;
+}
+
+RenderObject* RenderTreePosition::previousSiblingRenderer(const Text& textNode) const
+{
+    if (textNode.renderer())
+        return textNode.renderer()->previousSibling();
+
+    auto* parentElement = m_parent.element();
+
+    auto composedChildren = composedTreeChildren(*parentElement);
+    for (auto it = composedChildren.at(textNode), end = composedChildren.end(); it != end; --it) {
+        RenderObject* renderer = it->renderer();
+        if (renderer && !isRendererReparented(*renderer))
+            return renderer;
+    }
+    if (auto* before = parentElement->beforePseudoElement())
+        return before->renderer();
+    return nullptr;
+}
+
+RenderObject* RenderTreePosition::nextSiblingRenderer(const Node& node) const
+{
+    auto* parentElement = m_parent.element();
+    if (!parentElement)
+        return nullptr;
+    if (node.isAfterPseudoElement())
+        return nullptr;
+
+    auto composedDescendants = composedTreeDescendants(*parentElement);
+    auto it = node.isBeforePseudoElement() ? composedDescendants.begin() : composedDescendants.at(node);
+    auto end = composedDescendants.end();
+
+    while (it != end) {
+        auto& node = *it;
+        bool hasDisplayContents = is<Element>(node) && downcast<Element>(node).hasDisplayContents();
+        if (hasDisplayContents) {
+            it.traverseNext();
+            continue;
+        }
+        RenderObject* renderer = node.renderer();
+        if (renderer && !isRendererReparented(*renderer))
+            return renderer;
+        
+        it.traverseNextSkippingChildren();
+    }
+    if (PseudoElement* after = parentElement->afterPseudoElement())
+        return after->renderer();
+    return nullptr;
+}
+
+#if ENABLE(CSS_REGIONS)
+RenderTreePosition RenderTreePosition::insertionPositionForFlowThread(Element* insertionParent, Element& element, const RenderStyle& style)
+{
+    ASSERT(element.shouldMoveToFlowThread(style));
+    auto& parentFlowThread = element.document().renderView()->flowThreadController().ensureRenderFlowThreadWithName(style.flowThread());
+
+    if (!insertionParent)
+        return { parentFlowThread, nullptr };
+
+    auto composedDescendants = composedTreeDescendants(*insertionParent);
+    auto it = element.isBeforePseudoElement() ? composedDescendants.begin() : composedDescendants.at(element);
+    auto end = composedDescendants.end();
+    while (it != end) {
+        auto& currentNode = *it;
+        bool hasDisplayContents = is<Element>(currentNode) && downcast<Element>(currentNode).hasDisplayContents();
+        if (hasDisplayContents) {
+            it.traverseNext();
+            continue;
+        }
+
+        auto* renderer = currentNode.renderer();
+        if (!renderer) {
+            it.traverseNextSkippingChildren();
+            continue;
+        }
+
+        if (!is<RenderElement>(*renderer)) {
+            it.traverseNext();
+            continue;
+        }
+
+        // We are the last child in this flow.
+        if (!isRendererReparented(*renderer))
+            return { parentFlowThread, nullptr };
+
+        if (renderer->style().hasFlowInto() && style.flowThread() == renderer->style().flowThread())
+            return { parentFlowThread, downcast<RenderElement>(renderer) };
+        // Nested flows, skip.
+        it.traverseNextSkippingChildren();
+    }
+    return { parentFlowThread, nullptr };
+}
+#endif
+    
+bool RenderTreePosition::isRendererReparented(const RenderObject& renderer)
+{
+    if (!renderer.node()->isElementNode())
+        return false;
+    if (renderer.style().hasFlowInto())
+        return true;
+    return false;
+}
+
+}