public static NeuOperation Execute(
this NeuInterpreter interpreter,
NeuExpression expr)
{
switch (expr)
{
case NeuLiteralExpression litExpr:
return(interpreter.Execute(litExpr));
///
case NeuIdentifierExpression idExpr:
return(interpreter.Execute(idExpr));
///
case NeuCallExpression callExpr:
return(interpreter.Execute(callExpr));
///
case NeuUnaryExpression unaryExpr when !unaryExpr.IsFixExpression():
return(interpreter.Execute(unaryExpr));
///
case NeuPrefixExpression prefixExpr:
return(interpreter.Execute(prefixExpr));
///
case NeuInfixExpression infixExpr:
return(interpreter.Execute(infixExpr));
///
case NeuPostfixExpression postfixExpr:
return(interpreter.Execute(postfixExpr));
///
default:
throw new Exception();
}
}
public static NeuIdentifier?GetIdentifier(
this NeuExpression expr)
{
switch (expr)
{
case NeuIdentifierExpression idExpr:
return(idExpr.GetIdentifier());
///
default:
return(null);
}
}
public static NeuOperation PrefixIncrement(
this NeuInterpreter interpreter,
NeuExpression operand)
{
var id = operand.GetIdentifier();
if (id == null)
{
throw new Exception();
}
///
var name = id.Source;
///
var operandResult = interpreter.Execute(operand);
///
switch (true)
{
case var _
when
operandResult is NeuInteger intResult:
return(interpreter.PrefixIncrement(name, intResult));
///
default:
throw new Exception();
}
}
public static NeuOperation Execute(
this NeuInterpreter interpreter,
NeuPrefixOperator op,
NeuExpression operand)
{
switch (op.OperatorType)
{
case NeuUnaryOperatorType.Increment:
return(interpreter.PrefixIncrement(operand));
///
case NeuUnaryOperatorType.Decrement:
return(interpreter.PrefixDecrement(operand));
///
default:
throw new Exception();
}
}
