75 lines
2.4 KiB
JavaScript
75 lines
2.4 KiB
JavaScript
/*
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* Copyright (C) 2020-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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class HtmlTemplateCollection {
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constructor(source) {
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this._templates = new Map();
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const sourceNode = (
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typeof source === 'string' ?
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new DOMParser().parseFromString(source, 'text/html') :
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source
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);
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const pattern = /^([\w\W]+)-template$/;
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for (const template of sourceNode.querySelectorAll('template')) {
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const match = pattern.exec(template.id);
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if (match === null) { continue; }
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this._prepareTemplate(template);
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this._templates.set(match[1], template);
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}
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}
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instantiate(name) {
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const template = this._templates.get(name);
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return document.importNode(template.content.firstChild, true);
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}
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instantiateFragment(name) {
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const template = this._templates.get(name);
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return document.importNode(template.content, true);
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}
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// Private
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_prepareTemplate(template) {
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if (template.dataset.removeWhitespaceText === 'true') {
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this._removeWhitespaceText(template);
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}
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}
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_removeWhitespaceText(template) {
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const {content} = template;
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const {TEXT_NODE} = Node;
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const iterator = document.createNodeIterator(content, NodeFilter.SHOW_TEXT);
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const removeNodes = [];
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while (true) {
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const node = iterator.nextNode();
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if (node === null) { break; }
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if (node.nodeType === TEXT_NODE && node.nodeValue.trim().length === 0) {
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removeNodes.push(node);
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}
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}
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for (const node of removeNodes) {
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const {parentNode} = node;
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if (parentNode !== null) {
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parentNode.removeChild(node);
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}
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}
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}
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}
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