private void Merge(XmlModelCommand newCommand)
{
// Some commands have to be merged (for example if the name or value of the same
// node is changed twice) because the SourceModifier is not designed to update
// stuff it just inserted into the buffer during the same transaction.
List<XmlModelCommand> toRemove = null;
foreach (var cmd in txCommands)
{
if (newCommand != cmd
&& newCommand.Merge(cmd))
{
if (toRemove == null)
{
toRemove = new List<XmlModelCommand>();
}
toRemove.Add(cmd);
}
}
RemoveRange(txCommands, toRemove);
// And remove this from undo list also, since we have edited the same command objects!
RemoveRange(undoCommands, toRemove);
}
internal void AddCommand(XmlModelCommand cmd)
{
var change = cmd.Change;
var node = change.Node;
if (change.Action == XObjectChange.Remove)
{
// If we are removing a node, then all changes to any descendent of this node
// can be discarded since the whole thing will be ripped out of the buffer anyway.
var rs = RemoveAllDescendentChanges(change);
if (rs == RemoveStatus.FoundSelfAdd)
{
/*
* 9/21/2007 - not sure what to do about the stuff below. Seems specific to the editor
* so commenting it out.
*
// then this remove is a no-op, unless the Add operation is one of those
// special ones where the buffer already contained the value - in this case
// the Remove operation is real, and the add operation is a no-op, otherwise
// they both cancel each other out.
string bufferValue = XmlEditorNoPushToBuffer(change.Node);
if (bufferValue == null) {
return;
}
*/
}
}
if (IsAncestorAdded(node, change.Parent))
{
// If the ancestor was added by this transaction, then we can ignore the child
// command because the XLink insert will insert the entire thing into the buffer
// including all changes already made by the child transaction.
return;
}
switch (change.Action)
{
case XObjectChange.Add:
AddNode(node); // record the add operation.
break;
case XObjectChange.Name:
Merge(cmd);
// Name changes must be done first, because an Add operation might
// cause a short end tag <A/> to be converted to <A></A>, and then
// a rename after that of the same node would result in two edit
// operations on the same end tag which is not supported by SourceModifier.
undoCommands.Insert(0, cmd);
txCommands.Insert(0, cmd);
return;
case XObjectChange.Value:
Merge(cmd);
break;
case XObjectChange.Remove:
break;
}
txCommands.Add(cmd);
}