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40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
/*
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* Copyright 2020 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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import {Collection, Node} from '@react-types/shared';
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import {getChildNodes} from './getChildNodes';
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const cache = new WeakMap<Iterable<unknown>, number>();
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export function getItemCount<T>(collection: Collection<Node<T>>): number {
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let count = cache.get(collection);
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if (count != null) {
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return count;
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}
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// TS isn't smart enough to know we've ensured count is a number, so use a new variable
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let counter = 0;
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let countItems = (items: Iterable<Node<T>>) => {
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for (let item of items) {
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if (item.type === 'section') {
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countItems(getChildNodes(item, collection));
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} else {
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counter++;
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}
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}
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};
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countItems(collection);
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cache.set(collection, counter);
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return counter;
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}
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