public override Completion Evaluate(Interpreter interpreter)
{
var lhs = unaryExpression.Evaluate(interpreter);
if (lhs.IsAbrupt())
{
return(lhs);
}
var lhsValue = lhs.GetValue();
if (lhsValue.IsAbrupt())
{
return(lhsValue);
}
var oldValueComp = lhsValue.value !.ToNumber();
if (oldValueComp.IsAbrupt())
{
return(oldValueComp);
}
var oldValue = oldValueComp.value as NumberValue;
if (!(lhs.value is ReferenceValue reference))
{
throw new InvalidOperationException("PrefixUpdateExpression.Evaluate: unaryExpression did not return a reference");
}
NumberValue newValue;
if (updateOperation == UpdateOperator.Decrement)
{
newValue = new NumberValue(oldValue !.number - 1);
}
else
{
newValue = new NumberValue(oldValue !.number + 1);
}
var putComp = reference.PutValue(newValue);
if (putComp.IsAbrupt())
{
return(putComp);
}
return(Completion.NormalCompletion(newValue));
}
public override Completion Evaluate(Interpreter interpreter)
{
Completion comp, comp2;
switch (unaryOperator)
{
case UnaryOperator.Delete:
var deleteComp = EvaluateDelete(interpreter);
if (deleteComp.IsAbrupt())
{
return(deleteComp);
}
return(Completion.NormalCompletion(deleteComp.Other ? BooleanValue.True : BooleanValue.False));
case UnaryOperator.Void:
unaryExpression.Evaluate(interpreter).GetValue();
return(Completion.NormalCompletion(UndefinedValue.Instance));
case UnaryOperator.Typeof:
return(EvaluateTypeof(interpreter));
case UnaryOperator.Plus:
comp = unaryExpression.Evaluate(interpreter).GetValue();
if (comp.IsAbrupt())
{
return(comp);
}
return(comp.value !.ToNumber());
case UnaryOperator.Negate:
comp = unaryExpression.Evaluate(interpreter).GetValue();
if (comp.IsAbrupt())
{
return(comp);
}
comp2 = comp.value !.ToNumber();
if (comp2.IsAbrupt())
{
return(comp2);
}
return(Completion.NormalCompletion(new NumberValue(-(comp2.value as NumberValue) !.number)));
case UnaryOperator.BitwiseNot:
comp = unaryExpression.Evaluate(interpreter).GetValue();
if (comp.IsAbrupt())
{
return(comp);
}
comp2 = comp.value !.ToNumber();
if (comp2.IsAbrupt())
{
return(comp2);
}
return(Completion.NormalCompletion(new NumberValue(~(int)(comp2.value as NumberValue) !.number)));
case UnaryOperator.LogicalNot:
comp = unaryExpression.Evaluate(interpreter).GetValue();
if (comp.IsAbrupt())
{
return(comp);
}
return(Completion.NormalCompletion(comp.value !.ToBoolean().boolean ? BooleanValue.False : BooleanValue.True));
default:
throw new InvalidOperationException($"OperatorUnaryExpression.Evaluate: Unknown UnaryOperator enum value {(int)unaryOperator}");
}
}
