///
public static Node?GetOperand(
this NeuPrefixExpression prefixExpression)
{
var done = false;
///
for (var i = prefixExpression.Children.Count(); i > 0 && !done; --i)
{
var child = prefixExpression.Children.ElementAt(i - 1);
///
switch (child)
{
case NeuPrefixOperator op:
done = true;
break;
///
case NeuExpression _:
case NeuIdentifier _: // maybe can remove this?
case NeuLiteral _: // maybe can remove this?
return(child);
///
default:
continue;
}
}
///
return(null);
}
public static NeuOperation Execute(
this NeuInterpreter interpreter,
NeuPrefixExpression prefixExpr)
{
var op = prefixExpr.GetOperator();
if (op == null)
{
throw new Exception();
}
///
var operand = prefixExpr.GetOperand() as NeuExpression;
if (operand == null)
{
throw new Exception();
}
///
return(interpreter.Execute(op, operand));
}
public static NeuPrefixOperator?GetOperator(
this NeuPrefixExpression prefixExpression)
{
return(prefixExpression.GetFirstOrDefault <NeuPrefixOperator>());
}
