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/*
* Copyright (C) 2020 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 <http://www.gnu.org/licenses/>.
*/
class HtmlTemplateCollection {
constructor(source) {
this._templates = new Map();
const sourceNode = (
typeof source === 'string' ?
new DOMParser().parseFromString(source, 'text/html') :
source
);
const pattern = /^([\w\W]+)-template$/;
for (const template of sourceNode.querySelectorAll('template')) {
const match = pattern.exec(template.id);
if (match === null) { continue; }
this._prepareTemplate(template);
this._templates.set(match[1], template);
}
}
instantiate(name) {
const template = this._templates.get(name);
return document.importNode(template.content.firstChild, true);
}
instantiateFragment(name) {
const template = this._templates.get(name);
return document.importNode(template.content, true);
}
// Private
_prepareTemplate(template) {
if (template.dataset.removeWhitespaceText === 'true') {
this._removeWhitespaceText(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 && 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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