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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, 2010, 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/HTMLFormControlsCollection.h"
     25 
     26 #include "HTMLNames.h"
     27 #include "core/html/HTMLFieldSetElement.h"
     28 #include "core/html/HTMLFormElement.h"
     29 #include "core/html/HTMLImageElement.h"
     30 
     31 namespace WebCore {
     32 
     33 using namespace HTMLNames;
     34 
     35 // Since the collections are to be "live", we have to do the
     36 // calculation every time if anything has changed.
     37 
     38 HTMLFormControlsCollection::HTMLFormControlsCollection(Node* ownerNode)
     39     : HTMLCollection(ownerNode, FormControls, OverridesItemAfter)
     40 {
     41     ASSERT(ownerNode->hasTagName(formTag) || ownerNode->hasTagName(fieldsetTag));
     42     ScriptWrappable::init(this);
     43 }
     44 
     45 PassRefPtr<HTMLFormControlsCollection> HTMLFormControlsCollection::create(Node* ownerNode, CollectionType)
     46 {
     47     return adoptRef(new HTMLFormControlsCollection(ownerNode));
     48 }
     49 
     50 HTMLFormControlsCollection::~HTMLFormControlsCollection()
     51 {
     52 }
     53 
     54 const Vector<FormAssociatedElement*>& HTMLFormControlsCollection::formControlElements() const
     55 {
     56     ASSERT(ownerNode());
     57     ASSERT(ownerNode()->hasTagName(formTag) || ownerNode()->hasTagName(fieldsetTag));
     58     if (ownerNode()->hasTagName(formTag))
     59         return toHTMLFormElement(ownerNode())->associatedElements();
     60     return static_cast<HTMLFieldSetElement*>(ownerNode())->associatedElements();
     61 }
     62 
     63 const Vector<HTMLImageElement*>& HTMLFormControlsCollection::formImageElements() const
     64 {
     65     ASSERT(ownerNode());
     66     return toHTMLFormElement(ownerNode())->imageElements();
     67 }
     68 
     69 Element* HTMLFormControlsCollection::virtualItemAfter(unsigned& offset, Element* previousItem) const
     70 {
     71     const Vector<FormAssociatedElement*>& elementsArray = formControlElements();
     72     if (previousItem)
     73         offset++;
     74     while (offset < elementsArray.size()) {
     75         FormAssociatedElement* element = elementsArray[offset];
     76         if (element->isEnumeratable())
     77             return toHTMLElement(element);
     78         offset++;
     79     }
     80     return 0;
     81 }
     82 
     83 static HTMLElement* firstNamedItem(const Vector<FormAssociatedElement*>& elementsArray,
     84     const Vector<HTMLImageElement*>* imageElementsArray, const QualifiedName& attrName, const String& name)
     85 {
     86     ASSERT(attrName == idAttr || attrName == nameAttr);
     87 
     88     for (unsigned i = 0; i < elementsArray.size(); ++i) {
     89         HTMLElement* element = toHTMLElement(elementsArray[i]);
     90         if (elementsArray[i]->isEnumeratable() && element->fastGetAttribute(attrName) == name)
     91             return element;
     92     }
     93 
     94     if (!imageElementsArray)
     95         return 0;
     96 
     97     for (unsigned i = 0; i < imageElementsArray->size(); ++i) {
     98         HTMLImageElement* element = (*imageElementsArray)[i];
     99         if (element->fastGetAttribute(attrName) == name)
    100             return element;
    101     }
    102 
    103     return 0;
    104 }
    105 
    106 Node* HTMLFormControlsCollection::namedItem(const AtomicString& name) const
    107 {
    108     // http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/nameditem.asp
    109     // This method first searches for an object with a matching id
    110     // attribute. If a match is not found, the method then searches for an
    111     // object with a matching name attribute, but only on those elements
    112     // that are allowed a name attribute.
    113     const Vector<HTMLImageElement*>* imagesElements = ownerNode()->hasTagName(fieldsetTag) ? 0 : &formImageElements();
    114     if (HTMLElement* item = firstNamedItem(formControlElements(), imagesElements, idAttr, name))
    115         return item;
    116 
    117     return firstNamedItem(formControlElements(), imagesElements, nameAttr, name);
    118 }
    119 
    120 void HTMLFormControlsCollection::updateNameCache() const
    121 {
    122     if (hasNameCache())
    123         return;
    124 
    125     HashSet<StringImpl*> foundInputElements;
    126 
    127     const Vector<FormAssociatedElement*>& elementsArray = formControlElements();
    128 
    129     for (unsigned i = 0; i < elementsArray.size(); ++i) {
    130         FormAssociatedElement* associatedElement = elementsArray[i];
    131         if (associatedElement->isEnumeratable()) {
    132             HTMLElement* element = toHTMLElement(associatedElement);
    133             const AtomicString& idAttrVal = element->getIdAttribute();
    134             const AtomicString& nameAttrVal = element->getNameAttribute();
    135             if (!idAttrVal.isEmpty()) {
    136                 appendIdCache(idAttrVal, element);
    137                 foundInputElements.add(idAttrVal.impl());
    138             }
    139             if (!nameAttrVal.isEmpty() && idAttrVal != nameAttrVal) {
    140                 appendNameCache(nameAttrVal, element);
    141                 foundInputElements.add(nameAttrVal.impl());
    142             }
    143         }
    144     }
    145 
    146     if (ownerNode()->hasTagName(formTag)) {
    147         const Vector<HTMLImageElement*>& imageElementsArray = formImageElements();
    148         for (unsigned i = 0; i < imageElementsArray.size(); ++i) {
    149             HTMLImageElement* element = imageElementsArray[i];
    150             const AtomicString& idAttrVal = element->getIdAttribute();
    151             const AtomicString& nameAttrVal = element->getNameAttribute();
    152             if (!idAttrVal.isEmpty() && !foundInputElements.contains(idAttrVal.impl()))
    153                 appendIdCache(idAttrVal, element);
    154             if (!nameAttrVal.isEmpty() && idAttrVal != nameAttrVal && !foundInputElements.contains(nameAttrVal.impl()))
    155                 appendNameCache(nameAttrVal, element);
    156         }
    157     }
    158 
    159     setHasNameCache();
    160 }
    161 
    162 void HTMLFormControlsCollection::namedGetter(const AtomicString& name, bool& returnValue0Enabled, RefPtr<RadioNodeList>& returnValue0, bool& returnValue1Enabled, RefPtr<Node>& returnValue1)
    163 {
    164     Vector<RefPtr<Node> > namedItems;
    165     this->namedItems(name, namedItems);
    166 
    167     if (!namedItems.size())
    168         return;
    169 
    170     if (namedItems.size() == 1) {
    171         returnValue1Enabled = true;
    172         returnValue1 = namedItems.at(0);
    173         return;
    174     }
    175 
    176     returnValue0Enabled = true;
    177     returnValue0 = this->ownerNode()->radioNodeList(name);
    178 }
    179 
    180 }
    181