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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) 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/NodeRareData.h"
     29 #include "core/dom/NodeTraversal.h"
     30 #include "core/html/HTMLObjectElement.h"
     31 
     32 namespace WebCore {
     33 
     34 using namespace HTMLNames;
     35 
     36 HTMLNameCollection::HTMLNameCollection(Node* document, CollectionType type, const AtomicString& name)
     37     : HTMLCollection(document, type, OverridesItemAfter)
     38     , m_name(name)
     39 {
     40 }
     41 
     42 HTMLNameCollection::~HTMLNameCollection()
     43 {
     44     ASSERT(ownerNode());
     45     ASSERT(ownerNode()->isDocumentNode());
     46     ASSERT(type() == WindowNamedItems || type() == DocumentNamedItems);
     47 
     48     ownerNode()->nodeLists()->removeCacheWithAtomicName(this, type(), m_name);
     49 }
     50 
     51 Element* HTMLNameCollection::virtualItemAfter(unsigned& offsetInArray, Element* previous) const
     52 {
     53     ASSERT_UNUSED(offsetInArray, !offsetInArray);
     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) || current->hasTagName(embedTag) || current->hasTagName(iframeTag)) {
     83                 if (current->getNameAttribute() == m_name)
     84                     return current;
     85             } else if (current->hasTagName(appletTag)) {
     86                 if (current->getNameAttribute() == m_name || current->getIdAttribute() == m_name)
     87                     return current;
     88             } else if (current->hasTagName(objectTag)) {
     89                 if ((current->getNameAttribute() == m_name || current->getIdAttribute() == m_name)
     90                     && static_cast<HTMLObjectElement*>(current)->isDocNamedItem())
     91                     return current;
     92             } else if (current->hasTagName(imgTag)) {
     93                 if (current->getNameAttribute() == m_name || (current->getIdAttribute() == m_name && current->hasName()))
     94                     return current;
     95             }
     96             break;
     97         default:
     98             ASSERT_NOT_REACHED();
     99         }
    100     }
    101 
    102     return 0;
    103 }
    104 
    105 }
    106