@Override
public Object call(ExecutionContext context, Object self, Object... args) {
// 15.4.4.8
JSObject o = Types.toObject(context, self);
long len = Types.toUint32(context, o.get(context, "length"));
long middle = (long) Math.floor(len / 2);
long lower = 0;
while (lower != middle) {
long upper = len - lower - 1;
Object lowerValue = o.get(context, "" + lower);
Object upperValue = o.get(context, "" + upper);
boolean lowerExists = o.hasProperty(context, "" + lower);
boolean upperExists = o.hasProperty(context, "" + upper);
if (lowerExists && upperExists) {
o.put(context, "" + lower, upperValue, true);
o.put(context, "" + upper, lowerValue, true);
} else if (upperExists) {
o.put(context, "" + lower, upperValue, true);
o.delete(context, "" + upper, true);
} else if (lowerExists) {
o.put(context, "" + upper, lowerValue, true);
o.delete(context, "" + lower, true);
} else {
// no action required
}
++lower;
}
return o;
}
@Override
public Object call(ExecutionContext context, Object self, Object... args) {
// 15.4.4.10
JSObject o = Types.toObject(context, self);
JSObject a = BuiltinArray.newArray(context);
long len = Types.toUint32(context, o.get(context, "length"));
long relativeStart = Types.toInteger(context, args[0]);
long k = Math.min(relativeStart, len);
if (relativeStart < 0) {
k = Math.max(len + relativeStart, 0);
}
long relativeEnd = len;
if (args[1] != Types.UNDEFINED) {
relativeEnd = Types.toInteger(context, args[1]);
}
long finalPos = Math.min(relativeEnd, len);
if (relativeEnd < 0) {
finalPos = Math.max(len + relativeEnd, 0);
}
long n = 0;
while (k < finalPos) {
boolean kPresent = o.hasProperty(context, "" + k);
if (kPresent) {
final Object kValue = o.get(context, "" + k);
a.defineOwnProperty(
context,
"" + n,
PropertyDescriptor.newDataPropertyDescriptor(kValue, true, true, true),
false);
}
++k;
++n;
}
return a;
}