/// <summary>
/// Create a rule node, add to current tree, and make it current root
/// </summary>
/// <param name="s"></param>
public override void traceIn(string s) // throws TokenStreamException
{
if (inputState.guessing > 0)
{
return;
}
ParseTreeRule subRoot = new ParseTreeRule(s);
if (currentParseTreeRoot.Count > 0)
{
ParseTreeRule oldRoot = (ParseTreeRule)currentParseTreeRoot.Peek();
oldRoot.addChild(subRoot);
}
currentParseTreeRoot.Push(subRoot);
numberOfDerivationSteps++;
}
/// <summary>
/// Adds LT(1) to the current parse subtree.
/// </summary>
/// <remarks>
/// <para>
/// Note that the match() routines add the node before checking for
/// correct match. This means that, upon mismatched token, there
/// will a token node in the tree corresponding to where that token
/// was expected. For no viable alternative errors, no node will
/// be in the tree as nothing was matched() (the lookahead failed
/// to predict an alternative).
/// </para>
/// </remarks>
protected void addCurrentTokenToParseTree() // throws TokenStreamException
{
if (inputState.guessing > 0)
{
return;
}
ParseTreeRule root = (ParseTreeRule)currentParseTreeRoot.Peek();
ParseTreeToken tokenNode = null;
if (LA(1) == Token.EOF_TYPE)
{
tokenNode = new ParseTreeToken(new antlr.CommonToken("EOF"));
}
else
{
tokenNode = new ParseTreeToken(LT(1));
}
root.addChild(tokenNode);
}