// Returns true if [a] and [b] are equivalent. Immutable values (null, bools,
// numbers, ranges, and strings) are equal if they have the same data. All
// other values are equal if they are identical objects.
public static bool Equals(Obj a, Obj b)
{
if (a == b)
{
return(true);
}
if (a.Type != b.Type)
{
return(false);
}
if (a.Type == ObjType.Num)
{
return(a.Num == b.Num);
}
// If we get here, it's only possible for two heap-allocated immutable objects
// to be equal.
if (a.Type != ObjType.Obj)
{
return(true);
}
// Must be the same type.
if (a.GetType() != b.GetType())
{
return(false);
}
ObjString aString = a as ObjString;
if (aString != null)
{
ObjString bString = (ObjString)b;
return(aString.Str.Equals(bString.Str));
}
ObjRange aRange = a as ObjRange;
if (aRange != null)
{
ObjRange bRange = (ObjRange)b;
return(ObjRange.Equals(aRange, bRange));
}
// All other types are only equal if they are same, which they aren't if
// we get here.
return(false);
}
static bool range_from_numbers(WrenVM vm, Obj start, Obj end, bool inclusive, out Obj range)
{
if (end.Type == ObjType.Num)
{
double from = start.Num;
double to = end.Num;
range = new ObjRange(from, to, inclusive);
return true;
}
vm.Fiber.Error = Obj.MakeString("Right hand side of range must be a number.");
range = null;
return false;
}
public static bool Equals(ObjRange a, ObjRange b)
{
return(a != null && b != null && a.From == b.From && a.To == b.To && a.IsInclusive == b.IsInclusive);
}
public static bool Equals(ObjRange a, ObjRange b)
{
return a != null && b != null && a.From == b.From && a.To == b.To && a.IsInclusive == b.IsInclusive;
}