56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
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var Map = require('../modules/es.map');
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var WeakMap = require('../modules/es.weak-map');
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var shared = require('../internals/shared');
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var metadata = shared('metadata');
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var store = metadata.store || (metadata.store = new WeakMap());
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var getOrCreateMetadataMap = function (target, targetKey, create) {
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var targetMetadata = store.get(target);
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if (!targetMetadata) {
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if (!create) return;
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store.set(target, targetMetadata = new Map());
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}
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var keyMetadata = targetMetadata.get(targetKey);
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if (!keyMetadata) {
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if (!create) return;
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targetMetadata.set(targetKey, keyMetadata = new Map());
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} return keyMetadata;
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};
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var ordinaryHasOwnMetadata = function (MetadataKey, O, P) {
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var metadataMap = getOrCreateMetadataMap(O, P, false);
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return metadataMap === undefined ? false : metadataMap.has(MetadataKey);
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};
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var ordinaryGetOwnMetadata = function (MetadataKey, O, P) {
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var metadataMap = getOrCreateMetadataMap(O, P, false);
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return metadataMap === undefined ? undefined : metadataMap.get(MetadataKey);
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};
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var ordinaryDefineOwnMetadata = function (MetadataKey, MetadataValue, O, P) {
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getOrCreateMetadataMap(O, P, true).set(MetadataKey, MetadataValue);
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};
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var ordinaryOwnMetadataKeys = function (target, targetKey) {
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var metadataMap = getOrCreateMetadataMap(target, targetKey, false);
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var keys = [];
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if (metadataMap) metadataMap.forEach(function (_, key) { keys.push(key); });
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return keys;
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};
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var toMetadataKey = function (it) {
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return it === undefined || typeof it == 'symbol' ? it : String(it);
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};
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module.exports = {
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store: store,
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getMap: getOrCreateMetadataMap,
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has: ordinaryHasOwnMetadata,
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get: ordinaryGetOwnMetadata,
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set: ordinaryDefineOwnMetadata,
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keys: ordinaryOwnMetadataKeys,
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toKey: toMetadataKey
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};
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