62 lines
1.5 KiB
JavaScript
62 lines
1.5 KiB
JavaScript
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export class InternMap extends Map {
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constructor(entries, key = keyof) {
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super();
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Object.defineProperties(this, {_intern: {value: new Map()}, _key: {value: key}});
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if (entries != null) for (const [key, value] of entries) this.set(key, value);
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}
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get(key) {
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return super.get(intern_get(this, key));
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}
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has(key) {
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return super.has(intern_get(this, key));
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}
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set(key, value) {
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return super.set(intern_set(this, key), value);
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}
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delete(key) {
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return super.delete(intern_delete(this, key));
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}
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}
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export class InternSet extends Set {
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constructor(values, key = keyof) {
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super();
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Object.defineProperties(this, {_intern: {value: new Map()}, _key: {value: key}});
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if (values != null) for (const value of values) this.add(value);
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}
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has(value) {
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return super.has(intern_get(this, value));
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}
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add(value) {
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return super.add(intern_set(this, value));
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}
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delete(value) {
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return super.delete(intern_delete(this, value));
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}
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}
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function intern_get({_intern, _key}, value) {
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const key = _key(value);
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return _intern.has(key) ? _intern.get(key) : value;
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}
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function intern_set({_intern, _key}, value) {
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const key = _key(value);
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if (_intern.has(key)) return _intern.get(key);
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_intern.set(key, value);
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return value;
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}
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function intern_delete({_intern, _key}, value) {
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const key = _key(value);
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if (_intern.has(key)) {
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value = _intern.get(key);
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_intern.delete(key);
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}
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return value;
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}
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function keyof(value) {
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return value !== null && typeof value === "object" ? value.valueOf() : value;
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}
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