98 lines
3.3 KiB
TypeScript
98 lines
3.3 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2017-2022 The MathJax Consortium
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*
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* Licensed 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.
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* You may obtain a copy of the License at
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*
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Implement FunctionList object
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*
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* @author dpvc@mathjax.org (Davide Cervone)
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*/
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import {PrioritizedList, PrioritizedListItem} from './PrioritizedList.js';
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/*****************************************************************/
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/**
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* The FunctionListItem interface (extends PrioritizedListItem<Function>)
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*/
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export interface FunctionListItem extends PrioritizedListItem<Function> {}
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/*****************************************************************/
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/**
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* Implements the FunctionList class (extends PrioritizedList<Function>)
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*/
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export class FunctionList extends PrioritizedList<Function> {
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/**
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* Executes the functions in the list (in prioritized order),
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* passing the given data to the functions. If any return
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* false, the list is terminated.
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*
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* @param {any[]} data The array of arguments to pass to the functions
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* @return {boolean} False if any function stopped the list by
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* returning false, true otherwise
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*/
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public execute(...data: any[]): boolean {
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for (const item of this) {
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let result = item.item(...data);
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if (result === false) {
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return false;
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}
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}
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return true;
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}
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/**
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* Executes the functions in the list (in prioritized order) asynchronously,
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* passing the given data to the functions, and doing the next function
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* only when the previous one completes. If the function returns a
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* Promise, then use that to control the flow. Otherwise, if the
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* function returns false, the list is terminated.
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* This function returns a Promise. If any function in the list fails,
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* the promise fails. If any function returns false, the promise
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* succeeds, but passes false as its argument. Otherwise it succeeds
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* and passes true.
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*
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* @param {any[]} data The array of arguments to pass to the functions
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* @return {Promise} The promise that is satisfied when the function
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* list completes (with argument true or false
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* depending on whether some function returned
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* false or not).
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*/
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public asyncExecute(...data: any[]): Promise<void> {
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let i = -1;
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let items = this.items;
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return new Promise((ok: Function, fail: Function) => {
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(function execute() {
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while (++i < items.length) {
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let result = items[i].item(...data);
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if (result instanceof Promise) {
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result.then(execute).catch(err => fail(err));
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return;
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}
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if (result === false) {
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ok(false);
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return;
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}
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}
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ok(true);
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})();
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});
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}
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}
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