ASTNode HandleUnary(SherlockToken token, ASTNode currentNode)
{
GC.KeepAlive(token);
currentNode.Operation = ASTOperation.Not;
currentNode.First = new ASTNode(currentNode);
return(currentNode.First);
}
ASTNode HandleParentheses(SherlockToken token, ASTNode currentNode)
{
if (token.TokenType == SherlockTokenType.ParenthesesBegin)
{
currentNode.First = new ASTNode(currentNode);
return(currentNode.First);
}
return(currentNode.Parent);
}
public ASTNode Parse(string toParse)
{
ASTNode currentNode = new ASTNode(null);
SherlockToken currentToken = null;
try
{
lexer.PresetProgram(new StringReader(toParse));
while ((currentToken = lexer.ReadNext()) != null)
{
state.CurrentColumn = currentToken.Column;
if (!state.StateMachine.CanFire(currentToken.TokenType))
{
throw new InvalidOperationException();
}
state.StateMachine.Fire(currentToken.TokenType);
switch (currentToken.TokenType)
{
case SherlockTokenType.UnaryOperator:
break;
case SherlockTokenType.BinaryOperator:
break;
case SherlockTokenType.Label:
break;
}
}
}
catch (ParsingErrorException)
{
throw new ParsingErrorException(string.Format("Unexpected character '{0}' at column {1}.", currentToken.Value ?? "", currentToken.Column));
}
return(toReturn);
}
ASTNode HandleBinary(SherlockToken token, ASTNode currentNode)
{
GC.KeepAlive(token);
ASTNode tempNode = GetFreeNode(currentNode);
if (token.Value == "&&")
{
tempNode.Operation = ASTOperation.And;
}
else if (token.Value == "||")
{
tempNode.Operation = ASTOperation.Or;
}
if (tempNode.Parent == null)
{
toReturn = tempNode;
}
return(tempNode.Second);
}
ASTNode HandleValues(SherlockToken token, ASTNode currentNode)
{
currentNode.Value = token.Value;
return(currentNode);
}
ASTNode HandleBraces(SherlockToken token, ASTNode currentNode)
{
GC.KeepAlive(token);
return(currentNode);
}