dom_elementimpl.cpp

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    // For XML documents, we are non-validating and do not check against a DTD, even for HTML elements.
    if (getDocument()->isHTMLDocument())
        return checkChild(id(), newChild->id());
    return true;
}

bool ElementImpl::childTypeAllowed( unsigned short type )
{
    switch (type) {
        case Node::ELEMENT_NODE:
        case Node::TEXT_NODE:
        case Node::COMMENT_NODE:
        case Node::PROCESSING_INSTRUCTION_NODE:
        case Node::CDATA_SECTION_NODE:
        case Node::ENTITY_REFERENCE_NODE:
            return true;
            break;
        default:
            return false;
    }
}

void ElementImpl::dispatchAttrRemovalEvent(AttributeImpl *attr)
{
    if (!getDocument()->hasListenerType(DocumentImpl::DOMATTRMODIFIED_LISTENER))
	return;
    //int exceptioncode = 0;
//     dispatchEvent(new MutationEventImpl(EventImpl::DOMATTRMODIFIED_EVENT,true,false,attr,attr->value(),
// 		  attr->value(), getDocument()->attrName(attr->id()),MutationEvent::REMOVAL),exceptioncode);
}

void ElementImpl::dispatchAttrAdditionEvent(AttributeImpl *attr)
{
    if (!getDocument()->hasListenerType(DocumentImpl::DOMATTRMODIFIED_LISTENER))
	return;
   // int exceptioncode = 0;
//     dispatchEvent(new MutationEventImpl(EventImpl::DOMATTRMODIFIED_EVENT,true,false,attr,attr->value(),
//                                         attr->value(),getDocument()->attrName(attr->id()),MutationEvent::ADDITION),exceptioncode);
}

DOMString ElementImpl::openTagStartToString() const
{
    DOMString result = DOMString("<") + tagName();

    NamedAttrMapImpl *attrMap = attributes(true);

    if (attrMap) {
	unsigned long numAttrs = attrMap->length();
	for (unsigned long i = 0; i < numAttrs; i++) {
	    result += " ";

	    AttributeImpl *attribute = attrMap->attributeItem(i);
	    AttrImpl *attr = attribute->attrImpl();

	    if (attr) {
		result += attr->toString();
	    } else {
		result += getDocument()->attrName(attribute->id());
		if (!attribute->value().isNull()) {
		    result += "=\"";
		    // FIXME: substitute entities for any instances of " or '
		    result += attribute->value();
		    result += "\"";
		}
	    }
	}
    }

    return result;
}

DOMString ElementImpl::toString() const
{
    DOMString result = openTagStartToString();

    if (hasChildNodes()) {
	result += ">";

	for (NodeImpl *child = firstChild(); child != NULL; child = child->nextSibling()) {
	    result += child->toString();
	}

	result += "</";
	result += tagName();
	result += ">";
    } else {
	result += " />";
    }

    return result;
}

void ElementImpl::updateId(const AtomicString& oldId, const AtomicString& newId)
{
    if (!inDocument())
	return;

    if (oldId == newId)
	return;

    DocumentImpl* doc = getDocument();
    if (!oldId.isEmpty())
	doc->removeElementById(oldId, this);
    if (!newId.isEmpty())
	doc->addElementById(newId, this);
}

#ifndef NDEBUG
void ElementImpl::dump(QTextStream *stream, QString ind) const
{
    updateStyleAttributeIfNeeded();
    if (namedAttrMap) {
        for (uint i = 0; i < namedAttrMap->length(); i++) {
            AttributeImpl *attr = namedAttrMap->attributeItem(i);
            *stream << " " << DOMString(getDocument()->attrName(attr->id())).string().ascii()
                    << "=\"" << DOMString(attr->value()).string().ascii() << "\"";
        }
    }

    NodeBaseImpl::dump(stream,ind);
}
#endif

#ifndef NDEBUG
void ElementImpl::formatForDebugger(char *buffer, unsigned length) const
{
    DOMString result;
    DOMString s;
    
    s = nodeName();
    if (s.length() > 0) {
        result += s;
    }
          
    s = getAttribute(ATTR_ID);
    if (s.length() > 0) {
        if (result.length() > 0)
            result += "; ";
        result += "id=";
        result += s;
    }
          
    s = getAttribute(ATTR_CLASS);
    if (s.length() > 0) {
        if (result.length() > 0)
            result += "; ";
        result += "class=";
        result += s;
    }
          
    strncpy(buffer, result.string().latin1(), length - 1);
}
#endif

// -------------------------------------------------------------------------

XMLElementImpl::XMLElementImpl(DocumentPtr *doc, DOMStringImpl *_tagName)
    : ElementImpl(doc)
{
    m_id = doc->document()->tagId(0 /* no namespace */, _tagName,  false /* allocate */);
}

XMLElementImpl::XMLElementImpl(DocumentPtr *doc, DOMStringImpl *_qualifiedName, DOMStringImpl *_namespaceURI)
    : ElementImpl(doc)
{
    int colonpos = -1;
    for (uint i = 0; i < _qualifiedName->l; ++i)
        if (_qualifiedName->s[i] == ':') {
            colonpos = i;
            break;
        }

    if (colonpos >= 0) {
        // we have a prefix
        DOMStringImpl* localName = _qualifiedName->copy();
        localName->ref();
        localName->remove(0,colonpos+1);
        m_id = doc->document()->tagId(_namespaceURI, localName, false /* allocate */);
        localName->deref();
        m_prefix = _qualifiedName->copy();
        m_prefix->ref();
        m_prefix->truncate(colonpos);
    }
    else {
        // no prefix
        m_id = doc->document()->tagId(_namespaceURI, _qualifiedName, false /* allocate */);
        m_prefix = 0;
    }
}

XMLElementImpl::~XMLElementImpl()
{
}

DOMString XMLElementImpl::localName() const
{
    return getDocument()->tagName(m_id);
}


NodeImpl *XMLElementImpl::cloneNode ( bool deep )
{
    // ### we loose namespace here FIXME
    // should pass id around
    XMLElementImpl *clone = new XMLElementImpl(docPtr(), getDocument()->tagName(m_id).implementation());
    clone->m_id = m_id;

    // clone attributes
    if (namedAttrMap)
        *clone->attributes() = *namedAttrMap;

    if (deep)
        cloneChildNodes(clone);

    return clone;
}

// -------------------------------------------------------------------------

NamedAttrMapImpl::NamedAttrMapImpl(ElementImpl *e)
    : element(e)
{
    attrs = 0;
    len = 0;
}

NamedAttrMapImpl::~NamedAttrMapImpl()
{
    NamedAttrMapImpl::clearAttributes(); // virtual method, so qualify just to be explicit
}

bool NamedAttrMapImpl::isHTMLAttributeMap() const
{
    return false;
}

AttrImpl *NamedAttrMapImpl::getNamedItem ( NodeImpl::Id id ) const
{
    AttributeImpl* a = getAttributeItem(id);
    if (!a) return 0;

    if (!a->attrImpl())
        a->allocateImpl(element);

    return a->attrImpl();
}

Node NamedAttrMapImpl::setNamedItem ( NodeImpl* arg, int &exceptioncode )
{
    if (!element) {
        exceptioncode = DOMException::NOT_FOUND_ERR;
        return 0;
    }

    // NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.
    if (isReadOnly()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return 0;
    }

    // WRONG_DOCUMENT_ERR: Raised if arg was created from a different document than the one that created this map.
    if (arg->getDocument() != element->getDocument()) {
        exceptioncode = DOMException::WRONG_DOCUMENT_ERR;
        return 0;
    }

    // Not mentioned in spec: throw a HIERARCHY_REQUEST_ERROR if the user passes in a non-attribute node
    if (!arg->isAttributeNode()) {
        exceptioncode = DOMException::HIERARCHY_REQUEST_ERR;
        return 0;
    }
    AttrImpl *attr = static_cast<AttrImpl*>(arg);

    AttributeImpl* a = attr->attrImpl();
    AttributeImpl* old = getAttributeItem(a->id());
    if (old == a) return arg; // we know about it already

    // INUSE_ATTRIBUTE_ERR: Raised if arg is an Attr that is already an attribute of another Element object.
    // The DOM user must explicitly clone Attr nodes to re-use them in other elements.
    if (attr->ownerElement()) {
        exceptioncode = DOMException::INUSE_ATTRIBUTE_ERR;
        return 0;
    }

    if (a->id() == ATTR_ID) {
	element->updateId(old ? old->value() : nullAtom, a->value());
    }

    // ### slightly inefficient - resizes attribute array twice.
    Node r;
    if (old) {
        if (!old->attrImpl())
            old->allocateImpl(element);
        r = old->_impl;
        removeAttribute(a->id());
    }

    addAttribute(a);
    return r;
}

// The DOM2 spec doesn't say that removeAttribute[NS] throws NOT_FOUND_ERR
// if the attribute is not found, but at this level we have to throw NOT_FOUND_ERR
// because of removeNamedItem, removeNamedItemNS, and removeAttributeNode.
Node NamedAttrMapImpl::removeNamedItem ( NodeImpl::Id id, int &exceptioncode )
{
    // ### should this really be raised when the attribute to remove isn't there at all?
    // NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly
    if (isReadOnly()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return Node();
    }

    AttributeImpl* a = getAttributeItem(id);
    if (!a) {
        exceptioncode = DOMException::NOT_FOUND_ERR;
        return Node();
    }

    if (!a->attrImpl())  a->allocateImpl(element);
    Node r(a->attrImpl());

    if (id == ATTR_ID) {
	element->updateId(a->value(), nullAtom);
    }

    removeAttribute(id);
    return r;
}

AttrImpl *NamedAttrMapImpl::item ( unsigned long index ) const
{
    if (index >= len)
        return 0;

    if (!attrs[index]->attrImpl())
        attrs[index]->allocateImpl(element);

    return attrs[index]->attrImpl();
}

AttributeImpl* NamedAttrMapImpl::getAttributeItem(NodeImpl::Id id) const
{
    bool matchAnyNamespace = (namespacePart(id) == anyNamespace);
    for (unsigned long i = 0; i < len; ++i) {
        if (attrs[i]->id() == id)
            return attrs[i];
        else if (matchAnyNamespace) {
            if (localNamePart(attrs[i]->id()) == localNamePart(id))
                return attrs[i];
        }
    }
    return 0;
}

NodeImpl::Id NamedAttrMapImpl::mapId(const DOMString& namespaceURI,
                                     const DOMString& localName, bool readonly)
{
    assert(element);
    if (!element) return 0;
    return element->getDocument()->attrId(namespaceURI.implementation(),
                                            localName.implementation(), readonly);
}

void NamedAttrMapImpl::clearAttributes()
{
    if (attrs) {
        uint i;
        for (i = 0; i < len; i++) {
            if (attrs[i]->_impl)
                attrs[i]->_impl->m_element = 0;
            attrs[i]->deref();
        }
#ifndef __OOM__    
        delete [] attrs;
#else
        MemoryManager::Free( attrs );
#endif  
        attrs = 0;
    }
    len = 0;
}

void NamedAttrMapImpl::detachFromElement()
{
    // we allow a NamedAttrMapImpl w/o an element in case someone still has a reference
    // to if after the element gets deleted - but the map is now invalid
    element = 0;
    clearAttributes();
}

NamedAttrMapImpl& NamedAttrMapImpl::operator=(const NamedAttrMapImpl& other)
{
    // clone all attributes in the other map, but attach to our element
    if (!element) return *this;

    // If assigning the map changes the id attribute, we need to call
    // updateId.

    AttributeImpl *oldId = getAttributeItem(ATTR_ID);
    AttributeImpl *newId = other.getAttributeItem(ATTR_ID);

    if (oldId || newId) {
	element->updateId(oldId ? oldId->value() : nullAtom, newId ? newId->value() : nullAtom);
    }

    clearAttributes();
    len = other.len;
#ifndef __OOM__
    attrs = new AttributeImpl* [len];
#else
    attrs = (AttributeImpl**)MemoryManager::Alloc( len * sizeof( AttributeImpl* ) );
#endif 

    // first initialize attrs vector, then call attributeChanged on it
    // this allows attributeChanged to use getAttribute
    for (uint i = 0; i < len; i++) {
        attrs[i] = other.attrs[i]->clone();
        attrs[i]->ref();
    }

    // FIXME: This is wasteful.  The class list could be preserved on a copy, and we
    // wouldn't have to waste time reparsing the attribute.
    // The derived class, HTMLNamedAttrMapImpl, which manages a parsed class list for the CLASS attribute,
    // will update its member variable when parse attribute is called.
    for(uint i = 0; i < len; i++)
        element->attributeChanged(attrs[i], true);

    return *this;
}

void NamedAttrMapImpl::addAttribute(AttributeImpl *attr)
{
    // Add the attribute to the list
#ifndef __OOM__    
    AttributeImpl **newAttrs = new AttributeImpl* [len+1];
#else
    AttributeImpl **newAttrs = (AttributeImpl **)MemoryManager::Alloc( ( len+1 ) * sizeof(AttributeImpl*) );
#endif 
    if (attrs) {
      for (uint i = 0; i < len; i++)
        newAttrs[i] = attrs[i];
#ifndef __OOM__
        delete [] attrs;
#else 
        MemoryManager::Free( attrs );       
#endif
    }
    attrs = newAttrs;
    attrs[len++] = attr;
    attr->ref();

    AttrImpl * const attrImpl = attr->_impl;
    if (attrImpl)
        attrImpl->m_element = element;

    // Notify the element that the attribute has been added, and dispatch appropriate mutation events
    // Note that element may be null here if we are called from insertAttr() during parsing
    if (element) {
        element->attributeChanged(attr);
        element->dispatchAttrAdditionEvent(attr);
        element->dispatchSubtreeModifiedEvent(false);
    }
}

void NamedAttrMapImpl::removeAttribute(NodeImpl::Id id)
{
    unsigned long index = len+1;
    for (unsigned long i = 0; i < len; ++i)
        if (attrs[i]->id() == id) {
            index = i;
            break;
        }

    if (index >= len) return;

    // Remove the attribute from the list
    AttributeImpl* attr = attrs[index];
    if (attrs[index]->_impl)
        attrs[index]->_impl->m_element = 0;
    if (len == 1) {
#ifndef __OOM__
        delete [] attrs;
#else 
        MemoryManager::Free( attrs );       
#endif
        attrs = 0;
        len = 0;
    }
    else {
#ifndef __OOM__    
        AttributeImpl **newAttrs = new AttributeImpl* [len-1];
#else
        AttributeImpl **newAttrs = (AttributeImpl **)MemoryManager::Alloc( ( len-1 ) * sizeof(AttributeImpl*) );
#endif 
        uint i;
        for (i = 0; i < uint(index); i++)
            newAttrs[i] = attrs[i];
        len--;
        for (; i < len; i++)
            newAttrs[i] = attrs[i+1];
#ifndef __OOM__
        delete [] attrs;
#else 
        MemoryManager::Free( attrs );       
#endif
        attrs = newAttrs;
    }

    // Notify the element that the attribute has been removed
    // dispatch appropriate mutation events
    if (element && !attr->_value.isNull()) {
        AtomicString value = attr->_value;
        attr->_value = nullAtom;
        element->attributeChanged(attr);
        attr->_value = value;
    }
    if (element) {
        element->dispatchAttrRemovalEvent(attr);
        element->dispatchSubtreeModifiedEvent(false);
    }
    attr->deref();
}