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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Neither the name of Google Inc. nor the names of its
     11  * contributors may be used to endorse or promote products derived from
     12  * this software without specific prior written permission.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef NodeRenderingTraversal_h
     28 #define NodeRenderingTraversal_h
     29 
     30 #include "core/dom/Element.h"
     31 
     32 namespace WebCore {
     33 
     34 class InsertionPoint;
     35 
     36 namespace NodeRenderingTraversal {
     37 
     38 class ParentDetails {
     39 public:
     40     ParentDetails()
     41         : m_insertionPoint(0)
     42         , m_resetStyleInheritance(false)
     43         , m_outOfComposition(false)
     44     { }
     45 
     46     InsertionPoint* insertionPoint() const { return m_insertionPoint; }
     47     bool resetStyleInheritance() const { return m_resetStyleInheritance; }
     48     bool outOfComposition() const { return m_outOfComposition; }
     49 
     50     void didTraverseInsertionPoint(InsertionPoint*);
     51     void didTraverseShadowRoot(const ShadowRoot*);
     52     void childWasOutOfComposition() { m_outOfComposition = true; }
     53 
     54     bool operator==(const ParentDetails& other)
     55     {
     56         return m_insertionPoint == other.m_insertionPoint
     57             && m_resetStyleInheritance == other.m_resetStyleInheritance
     58             && m_outOfComposition == other.m_outOfComposition;
     59     }
     60 
     61 private:
     62     InsertionPoint* m_insertionPoint;
     63     bool m_resetStyleInheritance;
     64     bool m_outOfComposition;
     65 };
     66 
     67 ContainerNode* parent(const Node*);
     68 ContainerNode* parent(const Node*, ParentDetails*);
     69 Node* nextSibling(const Node*);
     70 Node* previousSibling(const Node*);
     71 
     72 Node* nextInScope(const Node*);
     73 Node* previousInScope(const Node*);
     74 Node* parentInScope(const Node*);
     75 Node* lastChildInScope(const Node*);
     76 
     77 inline ContainerNode* parent(const Node* node)
     78 {
     79     ParentDetails unusedDetails;
     80     return parent(node, &unusedDetails);
     81 }
     82 
     83 inline Element* parentElement(const Node* node)
     84 {
     85     ParentDetails unusedDetails;
     86     Node* found = parent(node, &unusedDetails);
     87     return found && found->isElementNode() ? toElement(found) : 0;
     88 }
     89 
     90 }
     91 
     92 } // namespace WebCore
     93 
     94 #endif
     95