mirror of https://github.com/gorhill/uBlock.git
117 lines
3.5 KiB
JavaScript
117 lines
3.5 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-present Raymond Hill
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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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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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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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Home: https://github.com/gorhill/uBlock
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*/
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/* jshint esversion:11 */
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'use strict';
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/******************************************************************************/
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// Important!
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// Isolate from global scope
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(function uBOL_cssDeclarative() {
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/******************************************************************************/
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const declarativeImports = self.declarativeImports || [];
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delete self.declarativeImports;
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const lookupSelectors = (hn, out) => {
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for ( const { argsList, hostnamesMap } of declarativeImports ) {
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let argsIndices = hostnamesMap.get(hn);
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if ( argsIndices === undefined ) { continue; }
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if ( typeof argsIndices === 'number' ) { argsIndices = [ argsIndices ]; }
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for ( const argsIndex of argsIndices ) {
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const details = argsList[argsIndex];
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if ( details.n && details.n.includes(hn) ) { continue; }
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out.push(...details.a.map(json => JSON.parse(json)));
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}
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}
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};
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let hn;
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try { hn = document.location.hostname; } catch(ex) { }
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const selectors = [];
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while ( hn ) {
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lookupSelectors(hn, selectors);
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if ( hn === '*' ) { break; }
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const pos = hn.indexOf('.');
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if ( pos !== -1 ) {
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hn = hn.slice(pos + 1);
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} else {
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hn = '*';
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}
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}
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declarativeImports.length = 0;
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/******************************************************************************/
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if ( selectors.length === 0 ) { return; }
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const cssRuleFromProcedural = details => {
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const { tasks, action } = details;
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let mq;
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if ( tasks !== undefined ) {
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if ( tasks.length > 1 ) { return; }
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if ( tasks[0][0] !== 'matches-media' ) { return; }
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mq = tasks[0][1];
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}
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let style;
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if ( Array.isArray(action) ) {
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if ( action[0] !== 'style' ) { return; }
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style = action[1];
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}
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if ( mq === undefined && style === undefined ) { return; }
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if ( mq === undefined ) {
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return `${details.selector}\n{${style}}`;
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}
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if ( style === undefined ) {
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return `@media ${mq} {\n${details.selector}\n{display:none!important;}\n}`;
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}
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return `@media ${mq} {\n${details.selector}\n{${style}}\n}`;
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};
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const sheetText = [];
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for ( const selector of selectors ) {
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const ruleText = cssRuleFromProcedural(selector);
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if ( ruleText === undefined ) { continue; }
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sheetText.push(ruleText);
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}
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if ( sheetText.length === 0 ) { return; }
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try {
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const sheet = new CSSStyleSheet();
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sheet.replace(`@layer{${sheetText.join('\n')}}`);
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document.adoptedStyleSheets = [
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...document.adoptedStyleSheets,
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sheet
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];
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} catch(ex) {
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}
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/******************************************************************************/
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})();
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/******************************************************************************/
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