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