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Add a TODO on Array#copyWithin

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This commit is contained in:
dcode
2019-06-05 04:22:40 +02:00
parent 93c9a4afd9
commit b7ca4baf42
17 changed files with 93 additions and 86 deletions
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31
std/assembly/array.ts
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@ -35,6 +35,8 @@ export class Array<T> extends ArrayBufferView {
// length is modified in a way that a null value would exist. Otherwise, the compiler wouldn't be
// able to guarantee type-safety anymore. For lack of a better word, such an array is "holey".
// Also note that capacity, not length, indicates the actual retained contents.
private length_: i32;
static isArray<U>(value: U): bool {
@ -244,19 +246,24 @@ export class Array<T> extends ArrayBufferView {
var last = end < 0 ? max(len + end, 0) : min(end, len);
var count = min(last - from, len - to);
if (from < to && to < (from + count)) {
from += count - 1;
to += count - 1;
while (count) {
store<T>(dataStart + (<usize>to << alignof<T>()), load<T>(dataStart + (<usize>from << alignof<T>())));
--from, --to, --count;
}
if (isManaged<T>()) {
// TODO: retain/release + consider intersection, only releasing what's removed
ERROR("not implemented");
} else {
memory.copy(
dataStart + (<usize>to << alignof<T>()),
dataStart + (<usize>from << alignof<T>()),
<usize>count << alignof<T>()
);
if (from < to && to < (from + count)) {
from += count - 1;
to += count - 1;
while (count) {
store<T>(dataStart + (<usize>to << alignof<T>()), load<T>(dataStart + (<usize>from << alignof<T>())));
--from, --to, --count;
}
} else {
memory.copy(
dataStart + (<usize>to << alignof<T>()),
dataStart + (<usize>from << alignof<T>()),
<usize>count << alignof<T>()
);
}
}
return this;
}