uBlock/src/js/scriptlets/cosmetic-survey.js

/*******************************************************************************

    uBlock Origin - a browser extension to block requests.
    Copyright (C) 2015-2016 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';

/******************************************************************************/

(function() {
    if ( typeof vAPI !== 'object' || !vAPI.domFilterer ) {
        return;
    }

    var xpr = document.evaluate(
        'count(//*[@' + vAPI.domFilterer.hiddenId + '])',
        document,
        null,
        XPathResult.NUMBER_TYPE,
        null
    );

    vAPI.messaging.send(
        'scriptlets',
        {
            what: 'cosmeticallyFilteredElementCount',
            pageURL: window.location.href,
            filteredElementCount: xpr && xpr.numberValue || 0
        }
    );
})();