audiobookshelf/client/assets/fastSort.js

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
    typeof define === 'function' && define.amd ? define(['exports'], factory) :
      (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global['fast-sort'] = {}));
}(this, (function (exports) {
  'use strict';

  // >>> INTERFACES <<<
  // >>> HELPERS <<<
  var castComparer = function (comparer) { return function (a, b, order) { return comparer(a, b, order) * order; }; };
  var throwInvalidConfigErrorIfTrue = function (condition, context) {
    if (condition)
      throw Error("Invalid sort config: " + context);
  };
  var unpackObjectSorter = function (sortByObj) {
    var _a = sortByObj || {}, asc = _a.asc, desc = _a.desc;
    var order = asc ? 1 : -1;
    var sortBy = (asc || desc);
    // Validate object config
    throwInvalidConfigErrorIfTrue(!sortBy, 'Expected `asc` or `desc` property');
    throwInvalidConfigErrorIfTrue(asc && desc, 'Ambiguous object with `asc` and `desc` config properties');
    var comparer = sortByObj.comparer && castComparer(sortByObj.comparer);
    return { order: order, sortBy: sortBy, comparer: comparer };
  };
  // >>> SORTERS <<<
  var multiPropertySorterProvider = function (defaultComparer) {
    return function multiPropertySorter(sortBy, sortByArr, depth, order, comparer, a, b) {
      var valA;
      var valB;
      if (typeof sortBy === 'string') {
        valA = a[sortBy];
        valB = b[sortBy];
      }
      else if (typeof sortBy === 'function') {
        valA = sortBy(a);
        valB = sortBy(b);
      }
      else {
        var objectSorterConfig = unpackObjectSorter(sortBy);
        return multiPropertySorter(objectSorterConfig.sortBy, sortByArr, depth, objectSorterConfig.order, objectSorterConfig.comparer || defaultComparer, a, b);
      }
      var equality = comparer(valA, valB, order);
      if ((equality === 0 || (valA == null && valB == null)) &&
        sortByArr.length > depth) {
        return multiPropertySorter(sortByArr[depth], sortByArr, depth + 1, order, comparer, a, b);
      }
      return equality;
    };
  };
  function getSortStrategy(sortBy, comparer, order) {
    // Flat array sorter
    if (sortBy === undefined || sortBy === true) {
      return function (a, b) { return comparer(a, b, order); };
    }
    // Sort list of objects by single object key
    if (typeof sortBy === 'string') {
      throwInvalidConfigErrorIfTrue(sortBy.includes('.'), 'String syntax not allowed for nested properties.');
      return function (a, b) { return comparer(a[sortBy], b[sortBy], order); };
    }
    // Sort list of objects by single function sorter
    if (typeof sortBy === 'function') {
      return function (a, b) { return comparer(sortBy(a), sortBy(b), order); };
    }
    // Sort by multiple properties
    if (Array.isArray(sortBy)) {
      var multiPropSorter_1 = multiPropertySorterProvider(comparer);
      return function (a, b) { return multiPropSorter_1(sortBy[0], sortBy, 1, order, comparer, a, b); };
    }
    // Unpack object config to get actual sorter strategy
    var objectSorterConfig = unpackObjectSorter(sortBy);
    return getSortStrategy(objectSorterConfig.sortBy, objectSorterConfig.comparer || comparer, objectSorterConfig.order);
  }
  var sortArray = function (order, ctx, sortBy, comparer) {
    var _a;
    if (!Array.isArray(ctx)) {
      return ctx;
    }
    // Unwrap sortBy if array with only 1 value to get faster sort strategy
    if (Array.isArray(sortBy) && sortBy.length < 2) {
      _a = sortBy, sortBy = _a[0];
    }
    return ctx.sort(getSortStrategy(sortBy, comparer, order));
  };
  // >>> Public <<<
  var createNewSortInstance = function (opts) {
    var comparer = castComparer(opts.comparer);
    return function (_ctx) {
      var ctx = Array.isArray(_ctx) && !opts.inPlaceSorting
        ? _ctx.slice()
        : _ctx;
      return {
        /**
         * Sort array in ascending order.
         * @example
         * sort([3, 1, 4]).asc();
         * sort(users).asc(u => u.firstName);
         * sort(users).asc([
         *   U => u.firstName
         *   u => u.lastName,
         * ]);
         */
        asc: function (sortBy) {
          return sortArray(1, ctx, sortBy, comparer);
        },
        /**
         * Sort array in descending order.
         * @example
         * sort([3, 1, 4]).desc();
         * sort(users).desc(u => u.firstName);
         * sort(users).desc([
         *   U => u.firstName
         *   u => u.lastName,
         * ]);
         */
        desc: function (sortBy) {
          return sortArray(-1, ctx, sortBy, comparer);
        },
        /**
         * Sort array in ascending or descending order. It allows sorting on multiple props
         * in different order for each of them.
         * @example
         * sort(users).by([
         *  { asc: u => u.score }
         *  { desc: u => u.age }
         * ]);
         */
        by: function (sortBy) {
          return sortArray(1, ctx, sortBy, comparer);
        },
      };
    };
  };
  var defaultComparer = function (a, b, order) {
    if (a == null)
      return order;
    if (b == null)
      return -order;
    if (a < b)
      return -1;
    if (a === b)
      return 0;
    return 1;
  };
  var sort = createNewSortInstance({
    comparer: defaultComparer,
  });
  var inPlaceSort = createNewSortInstance({
    comparer: defaultComparer,
    inPlaceSorting: true,
  });

  exports.createNewSortInstance = createNewSortInstance;
  exports.inPlaceSort = inPlaceSort;
  exports.sort = sort;

  Object.defineProperty(exports, '__esModule', { value: true });

})));