C++ DOMStringImpl::deref方法代码示例

void CharacterDataImpl::setData( const DOMString &_data, int &exceptioncode )
{
    // NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly
    if (isReadOnly()) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }

    if(str == _data.impl) return; // ### fire DOMCharacterDataModified if modified?
    DOMStringImpl *oldStr = str;
    str = _data.impl;
    if(str) str->ref();
    if (m_render)
      (static_cast<RenderText*>(m_render))->setText(str);
    setChanged(true);

    dispatchModifiedEvent(oldStr);
    if(oldStr) oldStr->deref();
}

void CharacterDataImpl::deleteData( const unsigned long offset, const unsigned long count, int &exceptioncode )
{
    exceptioncode = 0;
    if ((long)count < 0)
	exceptioncode = DOMException::INDEX_SIZE_ERR;
    else
	checkCharDataOperation(offset, exceptioncode);
    if (exceptioncode)
        return;

    DOMStringImpl *oldStr = str;
    str = str->copy();
    str->ref();
    str->remove(offset,count);
    if (m_render)
      (static_cast<RenderText*>(m_render))->setText(str);
    setChanged(true);

    dispatchModifiedEvent(oldStr);
    oldStr->deref();
}

void CharacterDataImpl::appendData( const DOMString &arg, int &exceptioncode )
{
    exceptioncode = 0;

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

    DOMStringImpl *oldStr = str;
    str = str->copy();
    str->ref();
    str->append(arg.impl);
    if (m_render)
      (static_cast<RenderText*>(m_render))->setText(str);
    setChanged(true);

    dispatchModifiedEvent(oldStr);
    oldStr->deref();
}

TextImpl *TextImpl::splitText( const unsigned long offset, int &exceptioncode )
{
    exceptioncode = 0;

    // INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than
    // the number of 16-bit units in data.

    // ### we explicitly check for a negative long that has been cast to an unsigned long
    // ... this can happen if JS code passes in -1 - we need to catch this earlier! (in the
    // kjs bindings)
    if (offset > str->l || (long)offset < 0) {
        exceptioncode = DOMException::INDEX_SIZE_ERR;
        return 0;
    }

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

    DOMStringImpl *oldStr = str;
    TextImpl *newText = createNew(str->substring(offset,str->l-offset));
    str = str->copy();
    str->ref();
    str->remove(offset,str->l-offset);

    dispatchModifiedEvent(oldStr);
    oldStr->deref();

    if (parentNode())
        parentNode()->insertBefore(newText,nextSibling(), exceptioncode );
    if ( exceptioncode )
        return 0;

    if (m_render)
        (static_cast<RenderText*>(m_render))->setText(str);
    setChanged(true);
    return newText;
}

void RenderStyle::addContent(DOM::DOMStringImpl *s)
{
    if(!s)
        return; // The string is null. Nothing to do. Just bail.

    StyleGeneratedData *t_generated = generated.access();

    ContentData *lastContent = t_generated->content;
    while(lastContent && lastContent->_nextContent)
        lastContent = lastContent->_nextContent;

    if(lastContent)
    {
        if(lastContent->_contentType == CONTENT_TEXT)
        {
            // We can augment the existing string and share this ContentData node.
            DOMStringImpl *oldStr = lastContent->_content.text;
            DOMStringImpl *newStr = oldStr->copy();
            newStr->ref();
            oldStr->deref();
            newStr->append(s);
            lastContent->_content.text = newStr;
            return;
        }
    }

    ContentData *newContentData = new ContentData;

    if(lastContent)
        lastContent->_nextContent = newContentData;
    else
        t_generated->content = newContentData;

    newContentData->_content.text = s;
    newContentData->_content.text->ref();
    newContentData->_contentType = CONTENT_TEXT;
}

void CharacterDataImpl::dispatchModifiedEvent(DOMStringImpl *prevValue)
{
    if (parentNode())
        parentNode()->childrenChanged();
    if ((str->length() == 0) != (prevValue->length() == 0)) {
       // changes in emptiness triggers changes in :empty selector
       if (parentNode() && parentNode()->isElementNode())
           parentNode()->backwardsStructureChanged();
       // ### to fully support dynamic changes to :contains selector
       // backwardsStructureChanged should be called for all changes
    }
    if (!document()->hasListenerType(DocumentImpl::DOMCHARACTERDATAMODIFIED_LISTENER))
        return;

    DOMStringImpl *newValue = str->copy();
    newValue->ref();
    int exceptioncode = 0;
    MutationEventImpl* const evt = new MutationEventImpl(EventImpl::DOMCHARACTERDATAMODIFIED_EVENT,true,false,0,prevValue,newValue,DOMString(),0);
    evt->ref();
    dispatchEvent(evt,exceptioncode);
    evt->deref();
    newValue->deref();
    dispatchSubtreeModifiedEvent();
}

void RenderText::setText(DOMStringImpl *text, bool force)
{
    if( !force && str == text ) return;

    DOMStringImpl *oldstr = str;
    if(text && style())
        str = text->collapseWhiteSpace(style()->preserveLF(), style()->preserveWS());
    else
        str = text;
    if(str) str->ref();
    if(oldstr) oldstr->deref();

    if ( str && style() ) {
        oldstr = str;
        switch(style()->textTransform()) {
        case CAPITALIZE:
        {
            RenderObject *o;
            bool runOnString = false;

            // find previous non-empty text renderer if one exists
            for (o = previousRenderer(); o; o = o->previousRenderer()) {
                if (!o->isInlineFlow()) {
                    if (!o->isText())
                        break;

                    DOMStringImpl *prevStr = static_cast<RenderText*>(o)->string();
                    // !prevStr can happen with css like "content:open-quote;"
                    if (!prevStr)
                        break;

                    if (prevStr->length() == 0)
                        continue;
                    QChar c = (*prevStr)[prevStr->length() - 1];
                    if (!c.isSpace())
                        runOnString = true;

                    break;
                }
            }

            str = str->capitalize(runOnString);
        }
        break;

		
		
        case UPPERCASE: str = str->upper();       break;
        case LOWERCASE: str = str->lower();       break;
        case NONE:
        default:;
    }
        str->ref();
        oldstr->deref();
    }

    // ### what should happen if we change the text of a
    // RenderBR object ?
    KHTMLAssert(!isBR() || (str->l == 1 && (*str->s) == '\n'));
    KHTMLAssert(!str->l || str->s);

    setNeedsLayoutAndMinMaxRecalc();
#ifdef BIDI_DEBUG
    QConstString cstr(str->s, str->l);
    kdDebug( 6040 ) << "RenderText::setText( " << cstr.string().length() << " ) '" << cstr.string() << "'" << endl;
#endif
}

unsigned short IDTableBase::grabId(DOMStringImpl* origName, CaseNormalizeMode cnm)
{
    unsigned short newId;

    // Check for existing one, ignoring case if needed
    IDTableBase::MappingKey::caseNormalizationMode = cnm;
    QHash<MappingKey, unsigned short>::const_iterator i = m_mappingLookup.constFind(origName);
    if (i != m_mappingLookup.constEnd()) {
        newId = *i;
        refId(newId);
        return newId;
    }

    // Nope. Allocate new ID. If there is normalization going on, we may now have to 
    // update our case so the canonical mapping is of the expected case. We
    // may also have to deep-copy 
    DOMStringImpl* name;
    switch (cnm) {
    case IDS_CaseSensitive:
        if (origName->m_shallowCopy) {
            // Create a new copy of the data since we may be extending its
            // lifetime indefinitely
            name = new DOMStringImpl(origName->s, origName->l);
            name->m_hash = origName->m_hash;
        } else {
            name = origName;
        }
        break;
    case IDS_NormalizeUpper:
        name = origName->upper();
        break;
    case IDS_NormalizeLower:
        name = origName->lower();
        break;
    }
    
    name->ref();

    if (!m_idFreeList.isEmpty()) {
        // Grab from freelist..
        newId = m_idFreeList.last();
        m_idFreeList.removeLast();
        m_mappings[newId].name = name;
    } else {
        // Make a new one --- if we can (we keep one spot for "last resort" mapping)
        if (m_mappings.size() < 0xFFFE) {
            m_mappings.append(Mapping(name));
            newId = m_mappings.size() - 1;
        } else {
            // We ran out of resources. Did we add a fallback mapping yet?
            // We use the same one for everything; and don't even keep track
            // of what it may go to, as we will have no way of freeing
            // the aliases. In particular, this means we no longer need the name..
            name->deref();
            
            if (m_mappings.size() == 0xFFFE) {
                // Need a new mapping..
                name = new DOMStringImpl("_khtml_fallback");
                m_mappings.append(Mapping(name));
                m_mappings[0xFFFF].refCount = 1; // pin it.
                name->ref();
            } else {
                name = m_mappings[0xFFFF].name; // No need to ref the name
                                                // here as the entry is eternal anyway
            }
            newId = 0xFFFF;
        }
    }

    m_mappingLookup[name] = newId;

    refId(newId);
    return newId;
}