public void ConvertEmittedElementsToRealTokenNodes(bool aRecurse)
{
int i = ChildCount;
//
while (i > 0)
{
SymNode child = this[--i];
//
if (child is SymTokenBalancerNodeEmittedElement)
{
SymTokenBalancerNodeEmittedElement emittedElement = (SymTokenBalancerNodeEmittedElement)child;
if (emittedElement.Emit)
{
SymNodeToken replacement = new SymNodeToken(emittedElement.Token);
InsertChild(replacement, child);
}
child.Remove();
}
else if (child is SymTokenBalancerMarkerLevelNode && aRecurse)
{
SymTokenBalancerMarkerLevelNode childLevel = (SymTokenBalancerMarkerLevelNode)child;
childLevel.ConvertEmittedElementsToRealTokenNodes(aRecurse);
}
}
}
public static void RemoveWhiteSpace(SymNode aNode, bool aRecurse)
{
int count = aNode.ChildCount;
for (int i = count - 1; i >= 0; i--)
{
SymNode basicNode = aNode[i];
// If the node is whitespace, then remove it
if (basicNode is SymNodeToken)
{
SymNodeToken tokenNode = (SymNodeToken)basicNode;
bool isWhiteSpace = (tokenNode.Token.Class == SymToken.TClass.EClassWhiteSpace);
//
if (isWhiteSpace)
{
System.Diagnostics.Debug.Assert(basicNode.HasChildren == false);
basicNode.Remove();
}
}
// Remove whitespace from this node's children
if (basicNode.HasChildren && aRecurse)
{
RemoveWhiteSpace(basicNode, aRecurse);
}
}
}
public virtual SymArgument MakeArgument(SymNode aLevelToMakeArgumentsFrom)
{
SymArgument argument = new SymArgument();
// Convert (recursively) any emitted elements to real tokens
if (aLevelToMakeArgumentsFrom is SymTokenBalancerMarkerLevelNode)
{
SymTokenBalancerMarkerLevelNode levelNode = (SymTokenBalancerMarkerLevelNode)aLevelToMakeArgumentsFrom;
levelNode.ConvertEmittedElementsToRealTokenNodes(true /*recurse*/);
}
// Now actually obtain the argument tokens
int count = aLevelToMakeArgumentsFrom.ChildCount;
int i = 0;
//
while (i < count)
{
SymNode n = aLevelToMakeArgumentsFrom[0];
// We always remove any other nodes, irrespective of their type.
// This is to ensure that the document tree does not get cluttered
// with redundant argument token info.
n.Remove();
// Now we decide what to do...
if (n is SymTokenBalancerMarkerArgumentNode)
{
// We've reached the argument itself. This is the
// signal to stop processing. We remove the argument node
// since its not relevant to the production of the tree.
break;
}
else if (n is SymTokenBalancerMarkerLevelNode)
{
// Create a new sub-argument node and copy over the
// children.
SymTokenBalancerMarkerLevelNode levelNode = (SymTokenBalancerMarkerLevelNode)n;
SymArgumentSubLevel subLevel = levelNode.AsArgumentSubLevel(true);
argument.CurrentNode.Add(subLevel);
}
else if (n is SymTokenBalancerNodeEmittedElement)
{
System.Diagnostics.Debug.Assert(false); // shouldn't get here anymore!
}
else if (n is SymNodeToken)
{
// Node is implicitly removed since it transfers
// from one tree to another.
argument.CurrentNode.Add(n);
}
count = aLevelToMakeArgumentsFrom.ChildCount;
}
//
SymTokenUtils.RemoveWhiteSpace(argument, true);
return(argument);
}
protected void SimplifyLevel(SymTokenBalancerMarkerLevelNode aLevel)
{
System.Diagnostics.Debug.Assert(aLevel.IsRoot == false && aLevel.HasParent);
SymNode parent = aLevel.Parent;
int levelNumber = parent.Depth;
//
int childCount = parent.ChildCount;
while (--childCount >= 0)
{
SymNode possibleLevelNode = parent[childCount];
// We're looking to remove redundant bracketing from either side of the level
// node. First check if we have a level node...
if (possibleLevelNode is SymTokenBalancerMarkerLevelNode)
{
// Then check whether it has a previous and a next node. These should
// be the SymTokenBalancerNodeEmittedElement nodes
if (possibleLevelNode.HasPrevious && possibleLevelNode.HasNext)
{
if (possibleLevelNode.Previous is SymTokenBalancerNodeEmittedElement && possibleLevelNode.Next is SymTokenBalancerNodeEmittedElement)
{
if (LevelCanBeMergedWithParent(possibleLevelNode as SymTokenBalancerMarkerLevelNode))
{
SymTokenBalancerNodeEmittedElement previous = (SymTokenBalancerNodeEmittedElement)possibleLevelNode.Previous;
SymTokenBalancerNodeEmittedElement next = (SymTokenBalancerNodeEmittedElement)possibleLevelNode.Next;
// Insert value node prior to previous node (which is the opening bracket token).
parent.InsertChildrenFrom(possibleLevelNode, previous.Previous);
// Remove the opening bracket token
previous.Remove();
// Remove the level marker token
possibleLevelNode.Remove();
// Remove the closing bracket token.
next.Remove();
}
}
}
}
}
}