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Add TypedArray#filter #818

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merged 7 commits into from
Sep 6, 2019
Merged

Add TypedArray#filter #818

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143b81c
init (wip)
MaxGraey Sep 5, 2019
0808337
update (wip)
MaxGraey Sep 5, 2019
6d9c520
fix
MaxGraey Sep 5, 2019
54c4873
add tests
MaxGraey Sep 5, 2019
9b30801
rebuild rest tests
MaxGraey Sep 5, 2019
c635dae
fixes to addressed review
MaxGraey Sep 6, 2019
3e6a0bf
refactor
MaxGraey Sep 6, 2019
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24 changes: 11 additions & 13 deletions std/assembly/typedarray.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1415,28 +1415,26 @@ function FILTER<TArray extends ArrayBufferView, T>(
fn: (value: T, index: i32, self: TArray) => bool,
): TArray {
var len = array.length;
var out = instantiate<TArray>(len);
var dataStart = array.dataStart;
var outDataStart = out.dataStart;
var j = 0;
var byteLength = len << alignof<T>();
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var out = changetype<TArray>(__alloc(offsetof<TArray>(), idof<TArray>()));
var buffer = __alloc(byteLength, idof<ArrayBuffer>());
var dataStart = array.dataStart;
var j: usize = 0;
for (let i = 0; i < len; i++) {
let value = load<T>(dataStart + (<usize>i << alignof<T>()));
if (fn(value, i, array)) {
store<T>(
outDataStart + (<usize>j << alignof<T>()),
buffer + (j++ << alignof<T>()),
value
);
++j;
}
}
// shrink output buffer
var finalLenght = <usize>j << alignof<T>();
var newStartData = __realloc(outDataStart, finalLenght);
if (newStartData !== outDataStart) {
out.data = changetype<ArrayBuffer>(newStartData); // retain
out.dataStart = newStartData;
}
out.dataLength = finalLenght;
var length = j << alignof<T>();
var data = __realloc(buffer, length);
out.data = changetype<ArrayBuffer>(data); // retain
out.dataStart = data;
out.dataLength = length;
return out;
}

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