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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 class RenderObject;
     36 
     37 namespace NodeRenderingTraversal {
     38 
     39 class ParentDetails {
     40 public:
     41     ParentDetails()
     42         : m_insertionPoint(0)
     43     { }
     44 
     45     const InsertionPoint* insertionPoint() const { return m_insertionPoint; }
     46 
     47     void didTraverseInsertionPoint(const InsertionPoint*);
     48 
     49     bool operator==(const ParentDetails& other)
     50     {
     51         return m_insertionPoint == other.m_insertionPoint;
     52     }
     53 
     54 private:
     55     const InsertionPoint* m_insertionPoint;
     56 };
     57 
     58 ContainerNode* parent(const Node*);
     59 ContainerNode* parent(const Node*, ParentDetails*);
     60 bool contains(const ContainerNode*, const Node*);
     61 Node* nextSibling(const Node*);
     62 Node* previousSibling(const Node*);
     63 Node* previous(const Node*, const Node* stayWithin);
     64 Node* next(const Node*, const Node* stayWithin);
     65 RenderObject* nextSiblingRenderer(const Node*);
     66 RenderObject* previousSiblingRenderer(const Node*);
     67 RenderObject* nextInTopLayer(const Element*);
     68 
     69 inline ContainerNode* parent(const Node* node)
     70 {
     71     ParentDetails unusedDetails;
     72     return parent(node, &unusedDetails);
     73 }
     74 
     75 inline Element* parentElement(const Node* node)
     76 {
     77     ParentDetails unusedDetails;
     78     Node* found = parent(node, &unusedDetails);
     79     return found && found->isElementNode() ? toElement(found) : 0;
     80 }
     81 
     82 }
     83 
     84 } // namespace WebCore
     85 
     86 #endif
     87