internal bool MergeAddSubtreeAtEnd(XmlDiffNode subtreeRoot)
{
Debug.Assert(subtreeRoot.NodeType != XmlDiffNodeType.Attribute);
DiffgramAddSubtrees addSubtrees = _lastChildOp as DiffgramAddSubtrees;
return(addSubtrees != null &&
addSubtrees.SetNewLastNode(subtreeRoot));
}
// produces <change> element in diffgram
private void OnChange( DiffgramParentOperation parent )
{
EditScriptChange chOp = _editScript as EditScriptChange;
Debug.Assert( chOp._targetIndex == _curTargetIndex );
Debug.Assert( chOp._sourceIndex == _curSourceIndex );
XmlDiffNode sourceRoot = _sourceNodes[ chOp._sourceIndex ];
XmlDiffNode targetRoot = _targetNodes[ chOp._targetIndex ];
Debug.Assert( !( sourceRoot is XmlDiffShrankNode) );
Debug.Assert( !( targetRoot is XmlDiffShrankNode) );
// adjust current position
_curSourceIndex--;
_curTargetIndex--;
// move to next edit script operation
_editScript = _editScript._nextEditScript;
DiffgramOperation diffgramNode = null;
if ( _bBuildingAddTree )
{
// <add> changed node to the new location
if ( targetRoot.NodeType == XmlDiffNodeType.Element )
diffgramNode = new DiffgramAddNode( targetRoot, 0 );
else
diffgramNode = new DiffgramAddSubtrees( targetRoot, 0, !_xmlDiff.IgnoreChildOrder );
// <remove> old node from old location -> add to postponed operations
bool bSubtree = sourceRoot.NodeType != XmlDiffNodeType.Element;
PostponedRemoveNode( sourceRoot, bSubtree, 0,
//AddToPosponedOperations( new DiffgramRemoveNode( sourceRoot, bSubtree, 0 ),
chOp._sourceIndex, chOp._sourceIndex );
// recursively process children
if ( sourceRoot.Left < chOp._sourceIndex ||
targetRoot.Left < chOp._targetIndex )
{
Debug.Assert( targetRoot.NodeType == XmlDiffNodeType.Element );
GenerateDiffgramAdd( (DiffgramParentOperation)diffgramNode, sourceRoot.Left, targetRoot.Left );
}
// add attributes, if element
if ( targetRoot.NodeType == XmlDiffNodeType.Element )
GenerateAddDiffgramForAttributes( (DiffgramParentOperation)diffgramNode, (XmlDiffElement)targetRoot );
}
else
{
ulong opid = 0;
// change of namespace or prefix -> get the appropriate operation id
if ( !_xmlDiff.IgnoreNamespaces &&
sourceRoot.NodeType == XmlDiffNodeType.Element )
{
XmlDiffElement sourceEl = (XmlDiffElement)sourceRoot;
XmlDiffElement targetEl = (XmlDiffElement)targetRoot;
if ( sourceEl.LocalName == targetEl.LocalName )
{
opid = GetNamespaceChangeOpid( sourceEl.NamespaceURI, sourceEl.Prefix,
targetEl.NamespaceURI, targetEl.Prefix );
}
}
if ( sourceRoot.NodeType == XmlDiffNodeType.Element )
{
if ( XmlDiff.IsChangeOperationOnAttributesOnly( chOp._changeOp ) )
diffgramNode = new DiffgramPosition( sourceRoot );
else
{
Debug.Assert( (int)chOp._changeOp == (int)XmlDiffOperation.ChangeElementName ||
( (int)chOp._changeOp >= (int)XmlDiffOperation.ChangeElementNameAndAttr1 &&
(int)chOp._changeOp <= (int)XmlDiffOperation.ChangeElementNameAndAttr2 ) );
diffgramNode = new DiffgramChangeNode( sourceRoot, targetRoot, XmlDiffOperation.ChangeElementName, opid );
}
// recursively process children
if ( sourceRoot.Left < chOp._sourceIndex ||
targetRoot.Left < chOp._targetIndex )
{
GenerateDiffgramMatch( (DiffgramParentOperation) diffgramNode, sourceRoot.Left, targetRoot.Left );
}
GenerateChangeDiffgramForAttributes( (DiffgramParentOperation)diffgramNode, (XmlDiffElement)sourceRoot, (XmlDiffElement)targetRoot );
}
else
{
// '<change>'
diffgramNode = new DiffgramChangeNode( sourceRoot, targetRoot, chOp._changeOp, opid );
Debug.Assert( !sourceRoot.HasChildNodes );
}
}
parent.InsertAtBeginning( diffgramNode );
}