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typedarray.ts
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233 lines (213 loc) · 6.21 KB
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import {
HEADER_SIZE as AB_HEADER_SIZE,
MAX_BLENGTH as AB_MAX_BLENGTH,
allocateUnsafe,
LOAD,
STORE
} from "./arraybuffer";
import {
SORT as SORT_IMPL
} from "./sort";
/** Typed array base class. Not a global object. */
export abstract class TypedArray<T> {
[key: number]: T; // compatibility only
readonly buffer: ArrayBuffer;
readonly byteOffset: i32;
readonly byteLength: i32;
constructor(length: i32) {
const MAX_LENGTH = <u32>AB_MAX_BLENGTH / sizeof<T>();
if (<u32>length > MAX_LENGTH) throw new RangeError("Invalid typed array length");
var byteLength = length << alignof<T>();
var buffer = allocateUnsafe(byteLength);
memory.fill(changetype<usize>(buffer) + AB_HEADER_SIZE, 0, <usize>byteLength);
this.buffer = buffer;
this.byteOffset = 0;
this.byteLength = byteLength;
}
@inline
get length(): i32 {
return this.byteLength >>> alignof<T>();
}
@operator("[]")
protected __get(index: i32): T {
if (<u32>index >= <u32>(this.byteLength >>> alignof<T>())) throw new Error("Index out of bounds");
return LOAD<T>(this.buffer, index, this.byteOffset);
}
@inline @operator("{}")
protected __unchecked_get(index: i32): T {
return LOAD<T>(this.buffer, index, this.byteOffset);
}
@operator("[]=")
protected __set(index: i32, value: NATIVE<T>): void {
if (<u32>index >= <u32>(this.byteLength >>> alignof<T>())) throw new Error("Index out of bounds");
STORE<T,NATIVE<T>>(this.buffer, index, value, this.byteOffset);
}
@inline @operator("{}=")
protected __unchecked_set(index: i32, value: NATIVE<T>): void {
STORE<T,NATIVE<T>>(this.buffer, index, value, this.byteOffset);
}
// copyWithin(target: i32, start: i32, end: i32 = this.length): this
}
@inline
export function FILL<TArray extends TypedArray<T>, T extends number>(
array: TArray,
value: NATIVE<T>,
start: i32,
end: i32
): TArray {
var buffer = array.buffer;
var byteOffset = array.byteOffset;
var len = array.length;
start = start < 0 ? max(len + start, 0) : min(start, len);
end = end < 0 ? max(len + end, 0) : min(end, len);
if (sizeof<T>() == 1) {
if (start < end) {
memory.fill(
changetype<usize>(buffer) + start + byteOffset + AB_HEADER_SIZE,
<u8>value,
<usize>(end - start)
);
}
} else {
for (; start < end; ++start) {
STORE<T,NATIVE<T>>(buffer, start, value, byteOffset);
}
}
return array;
}
@inline
export function SORT<TArray extends TypedArray<T>, T>(
array: TArray,
comparator: (a: T, b: T) => i32
): TArray {
var byteOffset = array.byteOffset;
var length = array.length;
if (length <= 1) return array;
var buffer = array.buffer;
if (length == 2) {
let a = LOAD<T>(buffer, 1, byteOffset);
let b = LOAD<T>(buffer, 0, byteOffset);
if (comparator(a, b) < 0) {
STORE<T>(buffer, 1, b, byteOffset);
STORE<T>(buffer, 0, a, byteOffset);
}
return array;
}
SORT_IMPL<T>(buffer, byteOffset, length, comparator);
return array;
}
@inline
export function SUBARRAY<TArray extends TypedArray<T>, T>(
array: TArray,
begin: i32,
end: i32
): TArray {
var length = <i32>array.length;
if (begin < 0) begin = max(length + begin, 0);
else begin = min(begin, length);
if (end < 0) end = max(length + end, begin);
else end = max(min(end, length), begin);
var slice = memory.allocate(offsetof<TArray>());
store<usize>(slice, array.buffer, offsetof<TArray>("buffer"));
store<i32>(slice, <i32>array.byteOffset + (begin << alignof<T>()), offsetof<TArray>("byteOffset"));
store<i32>(slice, (end - begin) << alignof<T>(), offsetof<TArray>("byteLength"));
return changetype<TArray>(slice);
}
@inline
export function REDUCE<TArray extends TypedArray<T>, T, TRet>(
array: TArray,
callbackfn: (accumulator: TRet, value: T, index: i32, array: TArray) => TRet,
initialValue: TRet
): TRet {
var length = array.length;
var buffer = array.buffer;
var byteOffset = array.byteOffset;
for (let i = 0; i < length; i++) {
initialValue = callbackfn(
initialValue,
LOAD<T>(buffer, i, byteOffset),
i,
array,
);
}
return initialValue;
}
@inline
export function REDUCE_RIGHT<TArray extends TypedArray<T>, T, TRet>(
array: TArray,
callbackfn: (accumulator: TRet, value: T, index: i32, array: TArray) => TRet,
initialValue: TRet
): TRet {
var buffer = array.buffer;
var byteOffset = array.byteOffset;
for (let i = array.length - 1; i >= 0; i--) {
initialValue = callbackfn(
initialValue,
LOAD<T>(buffer, i, byteOffset),
i,
array,
);
}
return initialValue;
}
@inline
export function MAP<TArray extends TypedArray<T>, T>(
array: TArray,
callbackfn: (value: T, index: i32, self: TArray) => T,
): TArray {
var length = array.length;
var buffer = array.buffer;
var byteOffset = array.byteOffset;
var result = instantiate<TArray>(length);
var resultBuffer = result.buffer;
for (let i = 0; i < length; i++) {
STORE<T, NATIVE<T>>(resultBuffer, i, <NATIVE<T>>callbackfn(LOAD<T>(buffer, i, byteOffset), i, array));
}
return result;
}
@inline
export function FIND_INDEX<TArray extends TypedArray<T>, T>(
array: TArray,
callbackfn: (value: T, index: i32, array: TArray) => bool,
): i32 {
var length = array.length;
var buffer = array.buffer;
var byteOffset = array.byteOffset;
for (let i = 0; i < length; i++) {
if (callbackfn(LOAD<T>(buffer, i, byteOffset), i, array)) {
return i;
}
}
return -1;
}
@inline
export function SOME<TArray extends TypedArray<T>, T>(
array: TArray,
callbackfn: (value: T, index: i32, array: TArray) => bool,
): bool {
var length = array.length;
var buffer = array.buffer;
var byteOffset = array.byteOffset;
for (let i = 0; i < length; i++) {
if (callbackfn(LOAD<T>(buffer, i, byteOffset), i, array)) {
return true;
}
}
return false;
}
@inline
export function EVERY<TArray extends TypedArray<T>, T>(
array: TArray,
callbackfn: (value: T, index: i32, array: TArray) => bool,
): bool {
var length = array.length;
var buffer = array.buffer;
var byteOffset = array.byteOffset;
for (let i = 0; i < length; i++) {
if (callbackfn(LOAD<T>(buffer, i, byteOffset), i, array)) {
continue;
}
return false;
}
return true;
}