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-rw-r--r--viewer/src/services/indexsearch.ts68
1 files changed, 0 insertions, 68 deletions
diff --git a/viewer/src/services/indexsearch.ts b/viewer/src/services/indexsearch.ts
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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*/
19
20import { Operation } from "@/@types/Operation";
21
22export default class IndexSearch {
23 // Results of the search (by tags)
24 public static search(searchTags: Tag.Search[]): Gallery.Item[] {
25 const byOperation = this.extractTagsByOperation(searchTags);
26 const intersection = this.extractIntersection(byOperation);
27 const substraction = this.extractSubstraction(byOperation);
28 return this.aggregateAll(byOperation, intersection, substraction);
29 }
30
31 private static extractTagsByOperation(searchTags: Tag.Search[]): Tag.SearchByOperation {
32 const byOperation: Tag.SearchByOperation = {};
33 Object.values(Operation).forEach(
34 operation => (byOperation[operation] = searchTags.filter(tag => tag.operation === operation))
35 );
36 return byOperation;
37 }
38
39 private static extractIntersection(byOperation: Tag.SearchByOperation): Set<Gallery.Item> {
40 const intersection = new Set<Gallery.Item>();
41 if (byOperation[Operation.INTERSECTION].length > 0) {
42 byOperation[Operation.INTERSECTION]
43 .map(tag => tag.items)
44 .reduce((a, b) => a.filter(c => b.includes(c)))
45 .flatMap(items => items)
46 .forEach(item => intersection.add(item));
47 }
48 return intersection;
49 }
50
51 private static extractSubstraction(byOperation: Tag.SearchByOperation): Set<Gallery.Item> {
52 const substraction = new Set<Gallery.Item>();
53 if (byOperation[Operation.SUBSTRACTION].length > 0) {
54 byOperation[Operation.SUBSTRACTION].flatMap(tag => tag.items).forEach(item => substraction.add(item));
55 }
56 return substraction;
57 }
58
59 private static aggregateAll(
60 byOperation: Tag.SearchByOperation,
61 intersection: Set<Gallery.Item>,
62 substraction: Set<Gallery.Item>
63 ): Gallery.Item[] {
64 byOperation[Operation.ADDITION].flatMap(tag => tag.items).forEach(item => intersection.add(item));
65 substraction.forEach(item => intersection.delete(item));
66 return [...intersection];
67 }
68}