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Fix implementation of Array#splice (#347)

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This commit is contained in:
Max Graey
2018-11-29 16:41:42 +02:00
committed by Daniel Wirtz
parent 1149abf824
commit 3c5c2cef80
7 changed files with 2371 additions and 1209 deletions
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27
std/assembly/array.ts
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@ -369,19 +369,28 @@ export class Array<T> {
return sliced;
}
splice(start: i32, deleteCount: i32 = i32.MAX_VALUE): void {
if (deleteCount < 1) return;
var length = this.length_;
if (start < 0) start = max(length + start, 0);
if (start >= length) return;
deleteCount = min(deleteCount, length - start);
var buffer = this.buffer_;
splice(start: i32, deleteCount: i32 = i32.MAX_VALUE): Array<T> {
var length = this.length_;
start = start < 0 ? max<i32>(length + start, 0) : min<i32>(start, length);
deleteCount = max<i32>(min<i32>(deleteCount, length - start), 0);
var buffer = this.buffer_;
var spliced = new Array<T>(deleteCount);
var source = changetype<usize>(buffer) + HEADER_SIZE + (<usize>start << alignof<T>());
memory.copy(
changetype<usize>(buffer) + HEADER_SIZE + (<usize>start << alignof<T>()),
changetype<usize>(buffer) + HEADER_SIZE + (<usize>(start + deleteCount) << alignof<T>()),
changetype<usize>(spliced.buffer_) + HEADER_SIZE,
source,
<usize>deleteCount << alignof<T>()
);
var offset = start + deleteCount;
if (length != offset) {
memory.copy(
source,
changetype<usize>(buffer) + HEADER_SIZE + (<usize>offset << alignof<T>()),
<usize>(length - offset) << alignof<T>()
);
}
this.length_ = length - deleteCount;
return spliced;
}
reverse(): Array<T> {