/// <summary>
/// Visit a value expression
/// </summary>
/// <param name="expression">The expression</param>
/// <exception cref="ArgumentNullException">Thrown when the input parameter is null</exception>
public void Visit(ValueExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
switch (expression.Type)
{
case ValueExpressionType.Integer:
result = int.Parse(expression.Text, CultureInfo.InvariantCulture);
break;
case ValueExpressionType.Variable:
int value;
int dereferencedValue;
int pointerValue;
if (context.TryResolveSymbol(expression.Text, out value))
{
result = context.Variables[expression.Text];
}
else if (context.TryResolveDereference(expression.Text, out dereferencedValue, out pointerValue))
{
// give a dummy pointer address for the pointer.
result = pointerValue;
}
else
{
int intValue;
if (Int32.TryParse(expression.Text, out intValue))
{
result = intValue;
}
else
{
result = expression.Text;
}
}
break;
case ValueExpressionType.Null:
result = expression.Text;
break;
default:
break;
}
}