src/third_party/WebKit/Source/core/html/HTMLNameCollection.cpp

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   4  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011, 2012 Apple Inc. All rights reserved.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public License
  17  * along with this library; see the file COPYING.LIB.  If not, write to
  18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #include "config.h"
  24 #include "core/html/HTMLNameCollection.h"
  25
  26 #include "HTMLNames.h"
  27 #include "core/dom/Element.h"
  28 #include "core/dom/ElementTraversal.h"
  29 #include "core/dom/NodeRareData.h"
  30 #include "core/html/HTMLEmbedElement.h"
  31 #include "core/html/HTMLObjectElement.h"
  32
  33 namespace WebCore {
  34
  35 using namespace HTMLNames;
  36
  37 HTMLNameCollection::HTMLNameCollection(ContainerNode* document, CollectionType type, const AtomicString& name)
  38     : HTMLCollection(document, type, OverridesItemAfter)
  39     , m_name(name)
  40 {
  41 }
  42
  43 HTMLNameCollection::~HTMLNameCollection()
  44 {
  45     ASSERT(ownerNode());
  46     ASSERT(ownerNode()->isDocumentNode());
  47     ASSERT(type() == WindowNamedItems || type() == DocumentNamedItems);
  48
  49     ownerNode()->nodeLists()->removeCache(this, type(), m_name);
  50 }
  51
  52 Element* HTMLNameCollection::virtualItemAfter(Element* previous) const
  53 {
  54     ASSERT(previous != ownerNode());
  55
  56     Element* current;
  57     if (!previous)
  58         current = ElementTraversal::firstWithin(*ownerNode());
  59     else
  60         current = ElementTraversal::next(*previous, ownerNode());
  61
  62     for (; current; current = ElementTraversal::next(*current, ownerNode())) {
  63         switch (type()) {
  64         case WindowNamedItems:
  65             // find only images, forms, applets, embeds and objects by name,
  66             // but anything by id
  67             if (current->hasTagName(imgTag)
  68                 || current->hasTagName(formTag)
  69                 || current->hasTagName(appletTag)
  70                 || current->hasTagName(embedTag)
  71                 || current->hasTagName(objectTag)) {
  72                 if (current->getNameAttribute() == m_name)
  73                     return current;
  74             }
  75             if (current->getIdAttribute() == m_name)
  76                 return current;
  77             break;
  78         case DocumentNamedItems:
  79             // find images, forms, applets, embeds, objects and iframes by name,
  80             // applets and object by id, and images by id but only if they have
  81             // a name attribute (this very strange rule matches IE)
  82             if (current->hasTagName(formTag)
  83                 || current->hasTagName(iframeTag)
  84                 || (current->hasTagName(embedTag) && toHTMLEmbedElement(current)->isExposed())) {
  85                 if (current->getNameAttribute() == m_name)
  86                     return current;
  87             } else if (current->hasTagName(appletTag)
  88                 || (current->hasTagName(objectTag) && toHTMLObjectElement(current)->isExposed())) {
  89                 if (current->getNameAttribute() == m_name || current->getIdAttribute() == m_name)
  90                     return current;
  91             } else if (current->hasTagName(imgTag)) {
  92                 if (current->getNameAttribute() == m_name || (current->getIdAttribute() == m_name && current->hasName()))
  93                     return current;
  94             }
  95             break;
  96         default:
  97             ASSERT_NOT_REACHED();
  98         }
  99     }
 100
 101     return 0;
 102 }
 103
 104 }