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/*
* Copyright (C) 2023-2024 Yomitan Authors
* Copyright (C) 2020-2022 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import {fetchText} from '../core/fetch-utilities.js';
export class HtmlTemplateCollection {
constructor() {
/** @type {Map<string, HTMLTemplateElement>} */
this._templates = new Map();
}
/**
* @param {string[]} urls
*/
async loadFromFiles(urls) {
const htmlRawArray = await Promise.all(urls.map((url) => fetchText(url)));
const domParser = new DOMParser();
for (const htmlRaw of htmlRawArray) {
const templatesDocument = domParser.parseFromString(htmlRaw, 'text/html');
this.load(templatesDocument);
}
}
/**
* @param {Document} source
*/
load(source) {
const pattern = /^([\w\W]+)-template$/;
for (const template of source.querySelectorAll('template')) {
const match = pattern.exec(template.id);
if (match === null) { continue; }
this._prepareTemplate(template);
this._templates.set(match[1], template);
}
}
/**
* @template {Element} T
* @param {string} name
* @returns {T}
* @throws {Error}
*/
instantiate(name) {
const template = this._templates.get(name);
if (typeof template === 'undefined') { throw new Error(`Failed to find template: ${name}`); }
const {firstElementChild} = template.content;
if (firstElementChild === null) { throw new Error(`Failed to find template content element: ${name}`); }
return /** @type {T} */ (document.importNode(firstElementChild, true));
}
/**
* @param {string} name
* @returns {DocumentFragment}
* @throws {Error}
*/
instantiateFragment(name) {
const template = this._templates.get(name);
if (typeof template === 'undefined') { throw new Error(`Failed to find template: ${name}`); }
const {content} = template;
return document.importNode(content, true);
}
/**
* @returns {IterableIterator<HTMLTemplateElement>}
*/
getAllTemplates() {
return this._templates.values();
}
// Private
/**
* @param {HTMLTemplateElement} template
*/
_prepareTemplate(template) {
if (template.dataset.removeWhitespaceText === 'true') {
this._removeWhitespaceText(template);
}
}
/**
* @param {HTMLTemplateElement} template
*/
_removeWhitespaceText(template) {
const {content} = template;
const {TEXT_NODE} = Node;
const iterator = document.createNodeIterator(content, NodeFilter.SHOW_TEXT);
const removeNodes = [];
while (true) {
const node = iterator.nextNode();
if (node === null) { break; }
if (node.nodeType === TEXT_NODE && /** @type {string} */ (node.nodeValue).trim().length === 0) {
removeNodes.push(node);
}
}
for (const node of removeNodes) {
const {parentNode} = node;
if (parentNode !== null) {
parentNode.removeChild(node);
}
}
}
}
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