//
//
public Expression Eval(List <Token> ops)
{
foreach (var op in ops)
{
CurrentDialect.GetAction(op)(op);
}
//Console.ReadKey();
//Console.WriteLine();
if (ExprStack.Count == 0)
{
return(null);
}
//else
#if DEBUG_EXPRESSION_PARSING
Debug.WriteLine("EvalStack Dump");
Debug.WriteLine("----------------");
foreach (var op in ExprStack)
{
Debug.Write(op.ToString());
Debug.Write("\t\t\t");
Debug.Write(op.NodeKind);
Debug.Write(" : ");
Debug.WriteLine(op.NodeKind);
}
Debug.WriteLine("");
#endif
Expression expr = ExprStack.Pop();
return(expr);
}
//
void ParseLine()
{
while (CurrentToken != null)
{
Token tok = CurrentToken;
TokenAction action = CurrentDialect.GetAction(tok);
action(tok);
}
}
void PushOperator(Token op)
{
/*if (op.IsNil)
* System.Diagnostics.Debugger.Break();*/
if (op.Kind == TokenKind.LeftRound)
{
ShuntStack.Push(op);
return;
}
if (CurrentState.ParseFlags.HasFlag(ParseFlag.ParsingClause))
{
if (op.IsProperty || op.IsOperator)
{
bool popParen = false;
while (ShuntStack.Count != 0)
{
Token op2 = ShuntStack.Peek();
if (op2.Kind == TokenKind.LeftRound)
{
break;
}
//else
ShuntStack.Pop();
ShuntQueue.Add(op2);
}
if (popParen && op.Kind != TokenKind.Property)
{
ShuntStack.Pop();
CurrentState.ParseFlags &= ~ParseFlag.ParsingClause;
}
}
}
while (ShuntStack.Count != 0)
{
int p = CurrentDialect.GetPrec(op);
int a = CurrentDialect.GetAssoc(op);
Token op2 = ShuntStack.Peek();
int p2 = CurrentDialect.GetPrec(op2);
int a2 = CurrentDialect.GetAssoc(op2);
if ((a == 0 && p >= p2) || (p > p2))
{
ShuntStack.Pop();
ShuntQueue.Add(op2);
}
else
{
break;
}
}
ShuntStack.Push(op);
}