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i < len; i++) {\n indices[i] = i;\n }\n\n indices.sort(this._getSorter(array));\n for (const index of indices) {\n yield array[index];\n }\n }\n\n thenBy<TKey>(\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number = defaultSorter\n ): OrderedAsyncIterableBaseX<TSource> {\n /* tslint:disable-next-line: no-use-before-declare */\n return new OrderedAsyncIterableX<TKey, TSource>(\n this._source,\n keySelector,\n comparer,\n false,\n this\n );\n }\n\n thenByDescending<TKey>(\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number = defaultSorter\n ): OrderedAsyncIterableBaseX<TSource> {\n /* tslint:disable-next-line: no-use-before-declare */\n return new OrderedAsyncIterableX<TKey, TSource>(\n this._source,\n keySelector,\n comparer,\n true,\n this\n );\n }\n\n abstract _getSorter(\n elements: TSource[],\n next?: (x: number, y: number) => number\n ): (x: number, y: number) => number;\n}\n\nexport class OrderedAsyncIterableX<TKey, TSource> extends OrderedAsyncIterableBaseX<TSource> {\n private _keySelector: (item: TSource) => TKey;\n private _comparer: (fst: TKey, snd: TKey) => number;\n private _descending: boolean;\n private _parent?: OrderedAsyncIterableBaseX<TSource>;\n\n constructor(\n source: AsyncIterable<TSource>,\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number,\n descending: boolean,\n parent?: OrderedAsyncIterableBaseX<TSource>\n ) {\n super(source);\n this._keySelector = keySelector;\n this._comparer = comparer;\n this._descending = descending;\n this._parent = parent;\n }\n\n _getSorter(\n elements: TSource[],\n next?: (x: number, y: number) => number\n ): (x: number, y: number) => number {\n const keys = elements.map(this._keySelector);\n const comparer = this._comparer;\n const parent = this._parent;\n const descending = this._descending;\n const sorter = (x: number, y: number): number => {\n const result = comparer(keys[x], keys[y]);\n if (result === 0) {\n return next ? next(x, y) : x - y;\n }\n\n return descending ? -result : result;\n };\n\n return parent ? parent._getSorter(elements, sorter) : sorter;\n }\n}\n\nexport function orderBy<TKey, TSource>(\n source: AsyncIterable<TSource>,\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number = defaultSorter\n): OrderedAsyncIterableX<TKey, TSource> {\n return new OrderedAsyncIterableX<TKey, TSource>(source, keySelector, comparer, false);\n}\n\nexport function orderByDescending<TKey, TSource>(\n source: AsyncIterable<TSource>,\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number = defaultSorter\n): OrderedAsyncIterableX<TKey, TSource> {\n return new OrderedAsyncIterableX<TKey, TSource>(source, keySelector, comparer, true);\n}\n\nexport function thenBy<TKey, TSource>(\n source: OrderedAsyncIterableBaseX<TSource>,\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number = defaultSorter\n): OrderedAsyncIterableX<TKey, TSource> {\n return new OrderedAsyncIterableX<TKey, TSource>(\n source._source,\n keySelector,\n comparer,\n false,\n source\n );\n}\n\nexport function thenByDescending<TKey, TSource>(\n source: OrderedAsyncIterableBaseX<TSource>,\n keySelector: (item: TSource) => TKey,\n comparer: (fst: TKey, snd: TKey) => number = defaultSorter\n): OrderedAsyncIterableX<TKey, TSource> {\n return new OrderedAsyncIterableX<TKey, TSource>(\n source._source,\n keySelector,\n comparer,\n true,\n source\n );\n}\n"]} |