67 lines
2.6 KiB
JavaScript
67 lines
2.6 KiB
JavaScript
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import "core-js/modules/es.error.cause.js";
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import { isNumeric } from "../../helpers/number.mjs";
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import { isFunction } from "../../helpers/function.mjs";
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export const ASC = 'asc';
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export const DESC = 'desc';
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const ORDER_MAP = new Map([[ASC, [-1, 1]], [DESC, [1, -1]]]);
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const DEFAULT_ERROR_PRIORITY_EXISTS = priority => `The priority '${priority}' is already declared in a map.`;
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const DEFAULT_ERROR_PRIORITY_NAN = priority => `The priority '${priority}' is not a number.`;
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/**
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* @typedef {object} PriorityMap
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* @property {Function} addItem Adds items to the priority map.
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* @property {Function} getItems Gets items from the passed map in a ASC or DESC order of priorities.
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*/
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/**
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* Creates a new priority map.
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*
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* @param {object} config The config for priority map.
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* @param {Function} config.errorPriorityExists The function to generate a custom error message if priority is already taken.
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* @param {Function} config.errorPriorityNaN The function to generate a custom error message if priority is not a number.
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* @returns {PriorityMap}
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*/
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export function createPriorityMap() {
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let {
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errorPriorityExists,
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errorPriorityNaN
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} = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
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const priorityMap = new Map();
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errorPriorityExists = isFunction(errorPriorityExists) ? errorPriorityExists : DEFAULT_ERROR_PRIORITY_EXISTS;
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errorPriorityNaN = isFunction(errorPriorityNaN) ? errorPriorityNaN : DEFAULT_ERROR_PRIORITY_NAN;
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/**
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* Adds items to priority map. Throws an error if `priority` is not a number or if is already added.
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*
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* @param {number} priority The priority for adding item.
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* @param {*} item The adding item.
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*/
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function addItem(priority, item) {
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if (!isNumeric(priority)) {
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throw new Error(errorPriorityNaN(priority));
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}
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if (priorityMap.has(priority)) {
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throw new Error(errorPriorityExists(priority));
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}
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priorityMap.set(priority, item);
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}
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/**
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* Gets items from the passed map in a ASC or DESC order of priorities.
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*
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* @param {string} [order] The order for getting items. ASC is an default.
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* @returns {*}
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*/
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function getItems() {
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let order = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : ASC;
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const [left, right] = ORDER_MAP.get(order) || ORDER_MAP.get(ASC);
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return [...priorityMap]
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// we want to be sure we sort over a priority key
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// if we are sure we can remove custom compare function
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// then we should replace next line with a default `.sort()`
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.sort((a, b) => a[0] < b[0] ? left : right).map(item => item[1]);
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}
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return {
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addItem,
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getItems
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};
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}
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