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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2015-present Raymond Hill
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/}.
Home: https://github.com/gorhill/uBlock
*/
'use strict';
/******************************************************************************/
// https://github.com/uBlockOrigin/uBlock-issues/issues/756
// Keep in mind CPU usage with large DOM and/or filterset.
(( ) => {
if ( typeof vAPI !== 'object' ) { return; }
const t0 = Date.now();
if ( vAPI.domSurveyElements instanceof Object === false ) {
vAPI.domSurveyElements = {
busy: false,
hiddenElementCount: Number.NaN,
surveyTime: t0,
};
}
const surveyResults = vAPI.domSurveyElements;
if ( surveyResults.busy ) { return; }
surveyResults.busy = true;
if ( surveyResults.surveyTime < vAPI.domMutationTime ) {
surveyResults.hiddenElementCount = Number.NaN;
}
surveyResults.surveyTime = t0;
if ( isNaN(surveyResults.hiddenElementCount) ) {
surveyResults.hiddenElementCount = (( ) => {
if ( vAPI.domFilterer instanceof Object === false ) { return 0; }
const details = vAPI.domFilterer.getAllSelectors(0b11);
if (
Array.isArray(details.declarative) === false ||
details.declarative.length === 0
) {
return 0;
}
return document.querySelectorAll(
details.declarative.join(',\n')
).length;
})();
}
surveyResults.busy = false;
// IMPORTANT: This is returned to the injector, so this MUST be
// the last statement.
return surveyResults.hiddenElementCount;
})();
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