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-rw-r--r--viewer/src/services/itemComparators.ts74
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1/* ldgallery - A static generator which turns a collection of tagged
2-- pictures into a searchable web gallery.
3--
4-- Copyright (C) 2019-2020 Guillaume FOUET
5--
6-- This program is free software: you can redistribute it and/or modify
7-- it under the terms of the GNU Affero General Public License as
8-- published by the Free Software Foundation, either version 3 of the
9-- License, or (at your option) any later version.
10--
11-- This program is distributed in the hope that it will be useful,
12-- but WITHOUT ANY WARRANTY; without even the implied warranty of
13-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14-- GNU Affero General Public License for more details.
15--
16-- You should have received a copy of the GNU Affero General Public License
17-- along with this program. If not, see <https://www.gnu.org/licenses/>.
18*/
19import { Item, ItemSortStr } from "@/@types/gallery";
20import i18n from "@/plugins/i18n";
21import { TranslateResult } from "vue-i18n";
22
23export type ItemComparator = (left: Item, right: Item) => number;
24export type ItemSort = { text: TranslateResult; fn: ItemComparator };
25
26export default class ItemComparators {
27 static readonly ITEM_SORTS: Record<ItemSortStr, ItemSort> = {
28 title_asc: {
29 text: i18n.t("command.sort.byTitleAsc"),
30 fn: ItemComparators.chain(ItemComparators.sortByTitleAsc, ItemComparators.sortByPathAsc),
31 },
32 date_asc: {
33 text: i18n.t("command.sort.byDateAsc"),
34 fn: ItemComparators.chain(ItemComparators.sortByDateAsc, ItemComparators.sortByPathAsc),
35 },
36 date_desc: {
37 text: i18n.t("command.sort.byDateDesc"),
38 fn: ItemComparators.reverse(ItemComparators.chain(ItemComparators.sortByDateAsc, ItemComparators.sortByPathAsc)),
39 },
40 };
41
42 static readonly DEFAULT = ItemComparators.ITEM_SORTS.date_asc;
43
44 static sortByPathAsc(left: Item, right: Item): number {
45 return left.path.localeCompare(right.path, undefined, {
46 sensitivity: "base",
47 ignorePunctuation: true,
48 numeric: true,
49 });
50 }
51
52 static sortByTitleAsc(left: Item, right: Item): number {
53 return left.title.localeCompare(right.title, undefined, {
54 sensitivity: "base",
55 ignorePunctuation: true,
56 numeric: true,
57 });
58 }
59
60 static sortByDateAsc(left: Item, right: Item): number {
61 return left.datetime.localeCompare(right.datetime); // TODO: handle timezones
62 }
63
64 static reverse(fn: ItemComparator): ItemComparator {
65 return (l, r) => -fn(l, r);
66 }
67
68 static chain(primary: ItemComparator, tieBreaker: ItemComparator): ItemComparator {
69 return (l, r) => {
70 const primaryComparison = primary(l, r);
71 return primaryComparison !== 0 ? primaryComparison : tieBreaker(l, r);
72 };
73 }
74}