Box* _listSlice(BoxedList* self, i64 start, i64 stop, i64 step) {
// printf("%ld %ld %ld\n", start, stop, step);
assert(step != 0);
if (step > 0) {
assert(0 <= start);
assert(stop <= self->size);
} else {
assert(start < self->size);
assert(-1 <= stop);
}
BoxedList* rtn = new BoxedList();
if ((step == 1) && ((stop - start) > 0)) {
listAppendArrayInternal(rtn, &self->elts->elts[start], stop - start);
} else {
int cur = start;
while ((step > 0 && cur < stop) || (step < 0 && cur > stop)) {
listAppendInternal(rtn, self->elts->elts[cur]);
cur += step;
}
}
return rtn;
}
Box* listMul(BoxedList* self, Box* rhs) {
if (rhs->cls != int_cls) {
raiseExcHelper(TypeError, "can't multiply sequence by non-int of type '%s'", getTypeName(rhs)->c_str());
}
LOCK_REGION(self->lock.asRead());
int n = static_cast<BoxedInt*>(rhs)->n;
int s = self->size;
BoxedList* rtn = new BoxedList();
rtn->ensure(n * s);
if (s == 1) {
for (int i = 0; i < n; i++) {
listAppendInternal(rtn, self->elts->elts[0]);
}
} else {
for (int i = 0; i < n; i++) {
listAppendArrayInternal(rtn, &self->elts->elts[0], s);
}
}
return rtn;
}
