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-/*
- * Copyright (C) 2021 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/>.
- */
-
-/**
- * This class is used to apply CSS styles to elements using a consistent method
- * that is the same across different browsers.
- */
-class CssStyleApplier {
- /**
- * Creates a new instance of the class.
- * @param styleDataUrl The local URL to the JSON file continaing the style rules.
- * The style rules should be of the format:
- * [
- * {
- * selectors: [(selector:string)...],
- * styles: [
- * [(property:string), (value:string)]...
- * ]
- * }...
- * ]
- */
- constructor(styleDataUrl) {
- this._styleDataUrl = styleDataUrl;
- this._styleData = [];
- this._cachedRules = new Map();
- }
-
- /**
- * Loads the data file for use.
- */
- async prepare() {
- this._styleData = await this._fetchJsonAsset(this._styleDataUrl);
- }
-
- /**
- * Applies CSS styles directly to the "style" attribute using the "class" attribute.
- * This only works for elements with a single class.
- * @param elements An iterable collection of HTMLElement objects.
- */
- applyClassStyles(elements) {
- const elementStyles = [];
- for (const element of elements) {
- const {className} = element;
- if (className.length === 0) { continue; }
- let cssTextNew = '';
- for (const {selectorText, styles} of this._getRulesForClass(className)) {
- if (!element.matches(selectorText)) { continue; }
- cssTextNew += this._getCssText(styles);
- }
- cssTextNew += element.style.cssText;
- elementStyles.push({element, style: cssTextNew});
- }
- for (const {element, style} of elementStyles) {
- element.removeAttribute('class');
- if (style.length > 0) {
- element.setAttribute('style', style);
- } else {
- element.removeAttribute('style');
- }
- }
- }
-
- // Private
-
- async _fetchJsonAsset(url) {
- const response = await fetch(url, {
- method: 'GET',
- mode: 'no-cors',
- cache: 'default',
- credentials: 'omit',
- redirect: 'follow',
- referrerPolicy: 'no-referrer'
- });
- if (!response.ok) {
- throw new Error(`Failed to fetch ${url}: ${response.status}`);
- }
- return await response.json();
- }
-
- _getRulesForClass(className) {
- let rules = this._cachedRules.get(className);
- if (typeof rules !== 'undefined') { return rules; }
-
- rules = [];
- this._cachedRules.set(className, rules);
-
- const classNamePattern = new RegExp(`.${className}(?![0-9a-zA-Z-])`, '');
- for (const {selectors, styles} of this._styleData) {
- const selectorText = selectors.join(',');
- if (!classNamePattern.test(selectorText)) { continue; }
- rules.push({selectorText, styles});
- }
-
- return rules;
- }
-
- _getCssText(styles) {
- let cssText = '';
- for (const [property, value] of styles) {
- cssText += `${property}:${value};`;
- }
- return cssText;
- }
-}