/**
* Utility method for traversing a text node that we know
* a-priori to be on a left or right boundary of the range.
* This method does not properly handle text nodes that contain
* both the start and end points of the range.
*
*/
DOM_Node RangeImpl::traverseTextNode( DOM_Node n, bool isLeft, int how )
{
DOMString txtValue = n.getNodeValue();
DOMString newNodeValue;
DOMString oldNodeValue;
if ( isLeft )
{
int offset = getStartOffset();
newNodeValue = txtValue.substringData( offset , fStartContainer.getNodeValue().length()-offset);
oldNodeValue = txtValue.substringData( 0, offset );
}
else
{
int offset = getEndOffset();
newNodeValue = txtValue.substringData( 0, offset );
oldNodeValue = txtValue.substringData( offset , fEndContainer.getNodeValue().length()-offset );
}
if ( how != CLONE_CONTENTS )
n.setNodeValue( oldNodeValue );
if ( how==DELETE_CONTENTS )
return null;
DOM_Node newNode = n.cloneNode( false );
newNode.setNodeValue( newNodeValue );
return newNode;
}
/**
* Visits the nodes selected by this range when we know
* a-priori that the start and end containers are the same.
*
*/
DOM_DocumentFragment RangeImpl::traverseSameContainer( int how )
{
DOM_DocumentFragment frag = null;
if ( how!=DELETE_CONTENTS)
frag = fDocument.createDocumentFragment();
// If selection is empty, just return the fragment
if ( fStartOffset==fEndOffset )
return frag;
DOM_Node current = fStartContainer;
DOM_Node cloneCurrent = null;
// Text node needs special case handling
if ( fStartContainer.getNodeType()== DOM_Node::TEXT_NODE )
{
cloneCurrent = fStartContainer.cloneNode(false);
cloneCurrent.setNodeValue(
cloneCurrent.getNodeValue().substringData(fStartOffset, fEndOffset - fStartOffset));
// set the original text node to its new value
if ( how != CLONE_CONTENTS )
((DOM_Text &)fStartContainer).deleteData(fStartOffset, fEndOffset-fStartOffset);
if ( how != DELETE_CONTENTS)
frag.appendChild(cloneCurrent);
}
else {
// Copy nodes between the start/end offsets.
DOM_Node n = getSelectedNode( fStartContainer, fStartOffset );
int cnt = fEndOffset - fStartOffset;
while( cnt > 0 )
{
DOM_Node sibling = n.getNextSibling();
DOM_Node xferNode = traverseFullySelected( n, how );
if ( frag!=null )
frag.appendChild( xferNode );
--cnt;
n = sibling;
}
}
// Nothing is partially selected, so collapse to start point
if ( how != CLONE_CONTENTS )
collapse(true);
return frag;
}