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node_modules/webpack/lib/util/processAsyncTree.js
68 строк
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Daniil
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31 окт 2023, 01:10
31 окт 2023, 01:10
a171ae1
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/* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra */ "use strict"; /** * @template T * @template {Error} E * @param {Iterable<T>} items initial items * @param {number} concurrency number of items running in parallel * @param {function(T, function(T): void, function(E=): void): void} processor worker which pushes more items * @param {function(E=): void} callback all items processed * @returns {void} */ const processAsyncTree = (items, concurrency, processor, callback) => { const queue = Array.from(items); if (queue.length === 0) return callback(); let processing = 0; let finished = false; let processScheduled = true; /** * @param {T} item item */ const push = item => { queue.push(item); if (!processScheduled && processing < concurrency) { processScheduled = true; process.nextTick(processQueue); } }; /** * @param {E | null | undefined} err error */ const processorCallback = err => { processing--; if (err && !finished) { finished = true; callback(err); return; } if (!processScheduled) { processScheduled = true; process.nextTick(processQueue); } }; const processQueue = () => { if (finished) return; while (processing < concurrency && queue.length > 0) { processing++; const item = /** @type {T} */ (queue.pop()); processor(item, push, processorCallback); } processScheduled = false; if (queue.length === 0 && processing === 0 && !finished) { finished = true; callback(); } }; processQueue(); }; module.exports = processAsyncTree;