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71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.WeakList = void 0;
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const DEFAULT_MINIMUM_LENGTH_TO_REALLOCATE = 8;
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const DEFAULT_MODULUS_TO_REALLOCATE_ON_PUSH = 1024;
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const MIN_DEAD_REFS_FOR_REALLOCATION_PERCENTAGE = 0.5;
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/**
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* A list-like collection that holds weak references to objects.
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* Automatically cleans up dead references when a threshold is met.
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*
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* FinalizationRegistry is not used here due to it's lack of determinism.
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* FinalizationRegsitry callbacks are not guaranteed to be called after an object is garbage collected.
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*/
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class WeakList {
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#list;
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#minimumLengthToReallocate;
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#modulusToReallocateOnPush;
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constructor() {
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this.#list = [];
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this.#minimumLengthToReallocate = DEFAULT_MINIMUM_LENGTH_TO_REALLOCATE;
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this.#modulusToReallocateOnPush = DEFAULT_MODULUS_TO_REALLOCATE_ON_PUSH;
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}
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*[Symbol.iterator]() {
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let deadRefCount = 0;
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for (const weakRef of this.#list) {
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const value = weakRef.deref();
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if (value === undefined) {
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++deadRefCount;
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}
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else {
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yield value;
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}
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}
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if (this.#list.length >= this.#minimumLengthToReallocate &&
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this.#shouldReallocate(deadRefCount)) {
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this.#reallocate(deadRefCount);
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}
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}
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push(value) {
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const weakRef = new WeakRef(value);
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this.#list.push(weakRef);
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if (this.#list.length >= this.#minimumLengthToReallocate &&
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this.#list.length % this.#modulusToReallocateOnPush === 0) {
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let deadRefCount = 0;
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for (const ref of this.#list) {
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if (ref.deref() === undefined) {
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++deadRefCount;
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}
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}
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if (this.#shouldReallocate(deadRefCount)) {
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this.#reallocate(deadRefCount);
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}
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}
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}
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#reallocate(deadRefCount) {
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const newList = new Array(this.#list.length - deadRefCount);
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let i = 0;
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for (const ref of this.#list) {
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if (ref.deref()) {
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newList[i++] = ref;
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}
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}
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this.#list = newList;
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}
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#shouldReallocate(deadRefCount) {
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return (deadRefCount >=
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this.#list.length * MIN_DEAD_REFS_FOR_REALLOCATION_PERCENTAGE);
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}
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}
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exports.WeakList = WeakList;
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//# sourceMappingURL=WeakList.js.map |