Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | 147x 147x 147x 147x 147x 147x 147x 147x 147x 147x 147x 147x 147x 147x 147x 153x 153x 153x 153x 153x 153x 230x 230x 1x 1x 1x 230x 229x 229x 229x 229x 229x 229x 229x 229x 230x 153x 153x 1x 1x 153x 153x 1x 1x 153x 153x 2x 2x 1x 1x 1x 1x 1x 1x 2x 153x 153x 65x 65x 65x 129x 129x 64x 129x 63x 63x 65x 65x 65x 65x 65x 65x 65x 153x 147x 1x 1x 1x 147x 147x 147x 147x 147x 147x | 'use strict';
const {
ObjectFreeze,
SafeFinalizationRegistry,
SafeSet,
SafeWeakMap,
SafeWeakRef,
SymbolIterator,
} = primordials;
// This class is modified from the example code in the WeakRefs specification:
// https://github.com/tc39/proposal-weakrefs
// Licensed under ECMA's MIT-style license, see:
// https://github.com/tc39/ecma262/blob/HEAD/LICENSE.md
class IterableWeakMap {
#weakMap = new SafeWeakMap();
#refSet = new SafeSet();
#finalizationGroup = new SafeFinalizationRegistry(cleanup);
set(key, value) {
const entry = this.#weakMap.get(key);
if (entry) {
// If there's already an entry for the object represented by "key",
// the value can be updated without creating a new WeakRef:
this.#weakMap.set(key, { value, ref: entry.ref });
} else {
const ref = new SafeWeakRef(key);
this.#weakMap.set(key, { value, ref });
this.#refSet.add(ref);
this.#finalizationGroup.register(key, {
set: this.#refSet,
ref
}, ref);
}
}
get(key) {
return this.#weakMap.get(key)?.value;
}
has(key) {
return this.#weakMap.has(key);
}
delete(key) {
const entry = this.#weakMap.get(key);
if (!entry) {
return false;
}
this.#weakMap.delete(key);
this.#refSet.delete(entry.ref);
this.#finalizationGroup.unregister(entry.ref);
return true;
}
[SymbolIterator]() {
const iterator = this.#refSet[SymbolIterator]();
const next = () => {
const result = iterator.next();
if (result.done) return result;
const key = result.value.deref();
if (key == null) return next();
const { value } = this.#weakMap.get(key);
return { done: false, value };
};
return {
[SymbolIterator]() { return this; },
next,
};
}
}
function cleanup({ set, ref }) {
set.delete(ref);
}
ObjectFreeze(IterableWeakMap.prototype);
module.exports = {
IterableWeakMap,
};
|