public override Expr Nud()
{
Expr right = ParseExpression(Tokenizer, 0);
if (CouldBeLvalue(right))
{
UnaryExpr u = new UnaryExpr(this, preOpcode, right);
return u;
}
/// Console.WriteLine("-------------");
/// right.Accept( new RPNPrintVisitor() );
/// Console.WriteLine();
/// Console.WriteLine("-------------");
throw new ParseException("bad lvalue", this);
}
public override Expr Nud()
{
bool negativeIntLiteral = Tokenizer.Current.Type == SimpleTokenType.IntLiteral;
bool negativeFloatLiteral = Tokenizer.Current.Type == SimpleTokenType.FloatLiteral;
Expr right = ParseExpression(Tokenizer, 1);
Expr u;
if (negativeIntLiteral)
{
u = new IntExpr(right.Token, -(right as IntExpr).IntValue);
}
else if (negativeFloatLiteral)
{
u = new FloatExpr(right.Token, -(right as FloatExpr).FloatValue);
}
else
{
u = new UnaryExpr(this, 0xe6, right); // NEG
}
if (right is VariableExpr || right is MemoryAccessExpr)
{
/// u.IsAssignment = true;
}
return u;
}
public override Expr Led(Expr left)
{
if (CouldBeLvalue(left))
{
UnaryExpr u = new UnaryExpr(this, postOpcode, left);
return u;
}
/// Console.WriteLine("-------------");
/// left.Accept( new RPNPrintVisitor() );
/// Console.WriteLine();
/// Console.WriteLine("-------------");
throw new ParseException("bad lvalue", this);
}
public void Visit(UnaryExpr e)
{
if (e.Token.Text == "@")
{
result = new FloInt(EvaluateAt(e.Operand));
return;
}
result = Expr.EvaluateConstant(e.Operand, insideDat);
if (result.IsInt)
{
switch (e.Token.Text.ToUpper())
{
case "^^": result = new FloInt((int)Math.Sqrt((uint)result.IntValue)); break;
case "||": result = new FloInt(Math.Abs(result.IntValue)); break;
case "|<": result = new FloInt(1 << result.IntValue); break;
case ">|": result = new FloInt(Encode(result.IntValue)); break;
case "!": result = new FloInt(~result.IntValue); break;
case "NOT": result = new FloInt(result.IntValue != 0 ? 0 : -1); break;
case "-": result = new FloInt(-result.IntValue); break;
default: throw new ParseException("Bad operator in constant expression: " + e.Token.Text, e.Token);
}
}
else
{
switch (e.Token.Text.ToUpper())
{
case "^^": result = new FloInt((float)Math.Sqrt(result.FloatValue)); break;
case "||": result = new FloInt(Math.Abs(result.FloatValue)); break;
case "NOT": result = new FloInt(result.FloatValue != 0.0f ? 0.0f : 1.0f); break;
case "-": result = new FloInt(-result.FloatValue); break;
default: throw new ParseException("Bad operator in constant expression: " + e.Token.Text, e.Token);
}
}
}