public void Visit(UnaryExpression expression)
{
throw new NotImplementedException();
}
/// <summary>
/// Visits a unary expression
/// </summary>
/// <param name="expression">The expression</param>
/// <exception cref="ArgumentNullException">Thrown when the input parameter is null</exception>
public void Visit(UnaryExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
expression.Expression.Accept(this);
if (result is int)
{
int param = (int)result;
switch (expression.Type)
{
case UnaryExpressionType.Not:
result = param != 0 ? 0 : 1;
break;
case UnaryExpressionType.BitNot:
result = ~param;
break;
case UnaryExpressionType.Positive:
result = +param;
break;
case UnaryExpressionType.Negative:
result = -param;
break;
case UnaryExpressionType.Dereference:
int value;
int pointerValue;
if (param == 1 || param == 0)
{
ValueExtractor ve = new ValueExtractor();
expression.Expression.Accept(ve);
string expr = ve.Expression;
if (context.TryResolveDereference(expr, out value, out pointerValue))
{
result = value;
}
}
else
{
IntPtr p = new IntPtr(param);
// only supports 32bit pointer here. To support 64bit, too much work to do
result = System.Runtime.InteropServices.Marshal.ReadInt32(p);
}
break;
default:
break;
}
}
else if (result is string)
{
result = GetUnaryOperatorString(expression.Type) + result.ToString();
}
}
