37 lines
1.0 KiB
JavaScript
37 lines
1.0 KiB
JavaScript
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import {TickingPromise} from '@avocado/core';
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import {Collection} from './collection';
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import {Traversal} from './traversal';
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export class Traversals extends Collection('traversal') {
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parallel(context) {
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const results = this.traversals.map((traversal) => {
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return traversal.traverse(context);
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});
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// Early out if no promises.
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if (!results.reduce((has, result) => {
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return has || result instanceof Promise;
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}, false)) {
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return results;
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}
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// Otherwise, wrap in a promise.
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const tpromise = new TickingPromise((resolve, reject) => {
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return Promise.all(results);
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});
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// Proxy all ticks.
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const tickableResults = results.filter((result) => {
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if (!(result instanceof TickingPromise)) return false;
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if ('function' !== typeof result.ticker) return false;
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return true;
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});
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if (tickableResults.length > 0) {
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tpromise.ticker = (elapsed) => {
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tickableResults.forEach((result) => result.ticker(elapsed));
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};
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}
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return tpromise;
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}
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}
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