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48 lines
1023 B
48 lines
1023 B
2 years ago
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// @flow strict-local
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export class DefaultMap<K, V> extends Map<K, V> {
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_getDefault: K => V;
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constructor(getDefault: K => V, entries?: Iterable<[K, V]>) {
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super(entries);
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this._getDefault = getDefault;
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}
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get(key: K): V {
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let ret;
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if (this.has(key)) {
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ret = super.get(key);
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} else {
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ret = this._getDefault(key);
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this.set(key, ret);
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}
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// $FlowFixMe
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return ret;
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}
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}
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// Duplicated from DefaultMap implementation for Flow
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// Roughly mirrors https://github.com/facebook/flow/blob/2eb5a78d92c167117ba9caae070afd2b9f598599/lib/core.js#L617
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export class DefaultWeakMap<K: interface {}, V> extends WeakMap<K, V> {
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_getDefault: K => V;
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constructor(getDefault: K => V, entries?: Iterable<[K, V]>) {
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super(entries);
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this._getDefault = getDefault;
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}
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get(key: K): V {
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let ret;
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if (this.has(key)) {
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ret = super.get(key);
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} else {
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ret = this._getDefault(key);
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this.set(key, ret);
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}
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// $FlowFixMe
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return ret;
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}
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}
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