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Avoid using Element.classList in DOM surveyor
Related issue: - https://github.com/uBlockOrigin/uBlock-issues/discussions/2076
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@ -1024,7 +1024,6 @@ vAPI.DOMFilterer = class {
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// Extract all classes/ids: these will be passed to the cosmetic
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// filtering engine, and in return we will obtain only the relevant
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// CSS selectors.
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const reWhitespace = /\s/;
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// https://github.com/gorhill/uBlock/issues/672
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// http://www.w3.org/TR/2014/REC-html5-20141028/infrastructure.html#space-separated-tokens
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@ -1039,19 +1038,21 @@ vAPI.DOMFilterer = class {
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queriedIds.add(s);
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};
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// https://github.com/uBlockOrigin/uBlock-issues/discussions/2076
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// Performance: avoid using Element.classList
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const classesFromNode = (node, out) => {
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const s = node.className;
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if ( typeof s !== 'string' || s.length === 0 ) { return; }
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if ( reWhitespace.test(s) === false ) {
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if ( queriedClasses.has(s) ) { return; }
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out.push(s);
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queriedClasses.add(s);
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return;
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}
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for ( const s of node.classList.values() ) {
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if ( queriedClasses.has(s) ) { continue; }
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out.push(s);
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queriedClasses.add(s);
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const s = node.getAttribute('class');
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if ( typeof s !== 'string' ) { return; }
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const len = s.length;
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for ( let beg = 0, end = 0, token = ''; beg < len; beg += 1 ) {
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end = s.indexOf(' ', beg);
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if ( end === beg ) { continue; }
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if ( end === -1 ) { end = len; }
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token = s.slice(beg, end);
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beg = end;
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if ( queriedClasses.has(token) ) { continue; }
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out.push(token);
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queriedClasses.add(token);
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}
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};
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