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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/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(Node* 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()->removeCacheWithAtomicName(this, type(), m_name);
     50 }
     51 
     52 Element* HTMLNameCollection::virtualItemAfter(unsigned& offsetInArray, Element* previous) const
     53 {
     54     ASSERT_UNUSED(offsetInArray, !offsetInArray);
     55     ASSERT(previous != ownerNode());
     56 
     57     Element* current;
     58     if (!previous)
     59         current = ElementTraversal::firstWithin(*ownerNode());
     60     else
     61         current = ElementTraversal::next(*previous, ownerNode());
     62 
     63     for (; current; current = ElementTraversal::next(*current, ownerNode())) {
     64         switch (type()) {
     65         case WindowNamedItems:
     66             // find only images, forms, applets, embeds and objects by name,
     67             // but anything by id
     68             if (current->hasTagName(imgTag)
     69                 || current->hasTagName(formTag)
     70                 || current->hasTagName(appletTag)
     71                 || current->hasTagName(embedTag)
     72                 || current->hasTagName(objectTag)) {
     73                 if (current->getNameAttribute() == m_name)
     74                     return current;
     75             }
     76             if (current->getIdAttribute() == m_name)
     77                 return current;
     78             break;
     79         case DocumentNamedItems:
     80             // find images, forms, applets, embeds, objects and iframes by name,
     81             // applets and object by id, and images by id but only if they have
     82             // a name attribute (this very strange rule matches IE)
     83             if (current->hasTagName(formTag)
     84                 || current->hasTagName(iframeTag)
     85                 || (current->hasTagName(embedTag) && toHTMLEmbedElement(current)->isExposed())) {
     86                 if (current->getNameAttribute() == m_name)
     87                     return current;
     88             } else if (current->hasTagName(appletTag)
     89                 || (current->hasTagName(objectTag) && toHTMLObjectElement(current)->isExposed())) {
     90                 if (current->getNameAttribute() == m_name || current->getIdAttribute() == m_name)
     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