private SyntaxToken EvalUnary(ConstantSyntaxToken value, UnaryOperationType type)
{
switch (type)
{
case UnaryOperationType.Factorial: return SyntaxToken.Constant(MathEx.Factorial(value.Value));
default: throw new NotSupportedException();
}
}
private SyntaxToken EvalBinary(ConstantSyntaxToken left, ConstantSyntaxToken right, BinaryOperationType type)
{
double lval = left.Value;
double rval = right.Value;
switch (type)
{
case BinaryOperationType.Add: return SyntaxToken.Constant(lval + rval);
case BinaryOperationType.Subtract: return SyntaxToken.Constant(lval - rval);
case BinaryOperationType.Multiply: return SyntaxToken.Constant(lval * rval);
case BinaryOperationType.Divide: return SyntaxToken.Constant(lval / rval);
case BinaryOperationType.Modulus: return SyntaxToken.Constant(lval % rval);
case BinaryOperationType.Power: return SyntaxToken.Constant(Math.Pow(lval, rval));
default: throw new NotSupportedException();
}
}
protected override SyntaxToken VisitConstant(ConstantSyntaxToken token)
{
return(SyntaxToken.Constant(0));
}
protected override SyntaxToken VisitConstant(ConstantSyntaxToken token)
{
return(new NullSyntaxToken());
}
protected override SyntaxToken VisitConstant(ConstantSyntaxToken token)
{
return token;
}
protected abstract SyntaxToken VisitConstant(ConstantSyntaxToken token);
