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/* ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019-2020 Guillaume FOUET
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { Operation } from "@/@types/Operation";
import Navigation from "@/services/navigation";
export default class IndexFactory {
public static generateTags(root: Gallery.Item | null): Tag.Index {
let tagsIndex: Tag.Index = {};
if (root) IndexFactory.pushTagsForItem(tagsIndex, root);
return tagsIndex;
}
// Pushes all tags for a root item (and its children) to the index
private static pushTagsForItem(tagsIndex: Tag.Index, item: Gallery.Item): void {
if (item.properties.type === "directory") {
item.properties.items.forEach(item => this.pushTagsForItem(tagsIndex, item));
return; // Directories are not indexed
}
for (const tag of item.tags) {
const parts = tag.split(":");
let lastPart: string | null = null;
for (const part of parts) {
tagsIndex[part] = IndexFactory.pushPartToIndex(tagsIndex[part], part, item, !Boolean(lastPart));
if (lastPart) {
const children = tagsIndex[lastPart].children;
children[part] = IndexFactory.pushPartToIndex(children[part], part, item, false);
}
lastPart = part;
}
if (lastPart) tagsIndex[lastPart].childPart = true;
}
}
private static pushPartToIndex(index: Tag.Node, part: string, item: Gallery.Item, rootPart: boolean): Tag.Node {
if (!index) index = { tag: part, tagfiltered: Navigation.normalize(part), rootPart, childPart: !rootPart, items: [], children: {} };
else if (rootPart) index.rootPart = true;
else index.childPart = true;
if (!index.items.includes(item)) index.items.push(item);
return index;
}
// ---
public static searchTags(tagsIndex: Tag.Index, filter: string, strict: boolean): Tag.Search[] {
let search: Tag.Search[] = [];
if (tagsIndex && filter) {
const operation = IndexFactory.extractOperation(filter);
if (operation !== Operation.INTERSECTION) filter = filter.slice(1);
if (filter.includes(":")) {
const filterParts = filter.split(":");
search = this.searchTagsFromFilterWithCategory(tagsIndex, operation, filterParts[0], filterParts[1], strict);
} else {
search = this.searchTagsFromFilter(tagsIndex, operation, filter, strict);
}
}
return search;
}
private static extractOperation(filter: string): Operation {
const first = filter.slice(0, 1);
switch (first) {
case Operation.ADDITION:
case Operation.SUBSTRACTION:
return first;
default:
return Operation.INTERSECTION;
}
}
private static searchTagsFromFilterWithCategory(
tagsIndex: Tag.Index,
operation: Operation,
category: string,
disambiguation: string,
strict: boolean
): Tag.Search[] {
category = Navigation.normalize(category);
disambiguation = Navigation.normalize(disambiguation);
return Object.values(tagsIndex)
.filter(node => IndexFactory.matches(node, category, strict))
.flatMap(node =>
Object.values(node.children)
.filter(child => IndexFactory.matches(child, disambiguation, strict))
.map(child => ({ ...child, parent: node, operation, display: `${operation}${node.tag}:${child.tag}` }))
);
}
private static searchTagsFromFilter(tagsIndex: Tag.Index, operation: Operation, filter: string, strict: boolean): Tag.Search[] {
filter = Navigation.normalize(filter);
return Object.values(tagsIndex)
.filter(node => IndexFactory.matches(node, filter, strict))
.map(node => ({ ...node, operation, display: `${operation}${node.tag}` }));
}
private static matches(node: Tag.Node, filter: string, strict: boolean): boolean {
if (strict) return node.tagfiltered === filter;
return node.tagfiltered.includes(filter)
}
// ---
public static generateCategories(tagsIndex: Tag.Index, categoryTags?: Gallery.RawTag[]): Tag.Category[] {
if (!categoryTags?.length) return [{ tag: "", index: tagsIndex }];
const tagsCategories: Tag.Category[] = [];
const tagsRemaining = new Map(Object.entries(tagsIndex));
categoryTags
.map(tag => ({ tag, index: tagsIndex[tag]?.children }))
.filter(category => category.index && Object.keys(category.index).length)
.forEach(category => {
tagsCategories.push(category);
[category.tag, ...Object.values(category.index).map(node => node.tag)]
.filter(tag => IndexFactory.isDiscriminantTagOnly(categoryTags, tagsIndex[tag]))
.forEach(tag => tagsRemaining.delete(tag));
});
tagsCategories.push({ tag: "", index: Object.fromEntries(tagsRemaining) });
return tagsCategories;
}
private static isDiscriminantTagOnly(tags: Gallery.RawTag[], node: Tag.Node): boolean {
return !tags.includes(node.tag) || !node.childPart;
}
}
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