C++ NodeImpl::cloneNode方法代码示例

void ParentNode::cloneChildren(const NodeImpl &other) {
  //    for (NodeImpl *mykid = other.getFirstChild();
    for (NodeImpl *mykid = ((NodeImpl&)other).getFirstChild();
         mykid != null;
         mykid = mykid->getNextSibling()) {
        this->appendChild(mykid->cloneNode(true));
    }
}

void NodeBaseImpl::cloneChildNodes(NodeImpl *clone, int &exceptioncode)
{
    NodeImpl *n;
//    for(n = firstChild(); n != lastChild() && !exceptioncode; n = n->nextSibling())
    for(n = firstChild(); n && !exceptioncode; n = n->nextSibling())
    {
	clone->appendChild(n->cloneNode(true,exceptioncode),exceptioncode);
    }
}

void KHTMLParser::handleResidualStyleCloseTagAcrossBlocks(HTMLStackElem* elem)
{
    // Find the element that crosses over to a higher level.   For now, if there is more than
    // one, we will just give up and not attempt any sort of correction.  It's highly unlikely that
    // there will be more than one, since <p> tags aren't allowed to be nested.
    int exceptionCode = 0;
    HTMLStackElem* curr = blockStack;
    HTMLStackElem* maxElem = 0;
    HTMLStackElem* prev = 0;
    HTMLStackElem* prevMaxElem = 0;
    while (curr && curr != elem) {
        if (curr->level > elem->level) {
            if (maxElem)
                return;
            maxElem = curr;
            prevMaxElem = prev;
        }

        prev = curr;
        curr = curr->next;
    }

    if (!curr || !maxElem || !isAffectedByResidualStyle(maxElem->id)) return;

    NodeImpl* residualElem = prev->node;
    NodeImpl* blockElem = prevMaxElem ? prevMaxElem->node : current;
    NodeImpl* parentElem = elem->node;

    // Check to see if the reparenting that is going to occur is allowed according to the DOM.
    // FIXME: We should either always allow it or perform an additional fixup instead of
    // just bailing here.
    // Example: <p><font><center>blah</font></center></p> isn't doing a fixup right now.
    if (!parentElem->childAllowed(blockElem))
        return;

    if (maxElem->node->parentNode() != elem->node) {
        // Walk the stack and remove any elements that aren't residual style tags.  These
        // are basically just being closed up.  Example:
        // <font><span>Moo<p>Goo</font></p>.
        // In the above example, the <span> doesn't need to be reopened.  It can just close.
        HTMLStackElem* currElem = maxElem->next;
        HTMLStackElem* prevElem = maxElem;
        while (currElem != elem) {
            HTMLStackElem* nextElem = currElem->next;
            if (!isResidualStyleTag(currElem->id)) {
                prevElem->next = nextElem;
                prevElem->node = currElem->node;
                delete currElem;
            }
            else
                prevElem = currElem;
            currElem = nextElem;
        }

        // We have to reopen residual tags in between maxElem and elem.  An example of this case is:
        // <font><i>Moo<p>Foo</font>.
        // In this case, we need to transform the part before the <p> into:
        // <font><i>Moo</i></font><i>
        // so that the <i> will remain open.  This involves the modification of elements
        // in the block stack.
        // This will also affect how we ultimately reparent the block, since we want it to end up
        // under the reopened residual tags (e.g., the <i> in the above example.)
        NodeImpl* prevNode = 0;
        NodeImpl* currNode = 0;
        currElem = maxElem;
        while (currElem->node != residualElem) {
            if (isResidualStyleTag(currElem->node->id())) {
                // Create a clone of this element.
                currNode = currElem->node->cloneNode(false);

                // Change the stack element's node to point to the clone.
                currElem->node = currNode;

                // Attach the previous node as a child of this new node.
                if (prevNode)
                    currNode->appendChild(prevNode, exceptionCode);
                else // The new parent for the block element is going to be the innermost clone.
                    parentElem = currNode;

                prevNode = currNode;
            }

            currElem = currElem->next;
        }

        // Now append the chain of new residual style elements if one exists.
        if (prevNode)
            elem->node->appendChild(prevNode, exceptionCode);
    }

    // We need to make a clone of |residualElem| and place it just inside |blockElem|.
    // All content of |blockElem| is reparented to be under this clone.  We then
    // reparent |blockElem| using real DOM calls so that attachment/detachment will
    // be performed to fix up the rendering tree.
    // So for this example: <b>...<p>Foo</b>Goo</p>
    // The end result will be: <b>...</b><p><b>Foo</b>Goo</p>
    //
    // Step 1: Remove |blockElem| from its parent, doing a batch detach of all the kids.
    blockElem->parentNode()->removeChild(blockElem, exceptionCode);

//.........这里部分代码省略.........