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/* eslint-env es6, node */

/* globals gc */

'use strict';

if (typeof gc !== 'function') {

throw new Error('Please re-run with `node --expose-gc utils/memusage.js`');

}

const { RuleSets } = require('../chromium/background-scripts/rules');

const { readFileSync } = require('fs');

const json = JSON.parse(readFileSync(`${__dirname}/../rules/default.rulesets`, 'utf-8'));

function memUsage() {

gc(); // don't measure garbage

return process.memoryUsage().heapUsed;

}

function memToString(before, after) {

return (Math.round((after - before) / (1 << 20) * 10) / 10).toLocaleString() + ' MB';

}

const start = memUsage();

let middle, end;

{

const ruleSets = new RuleSets(Object.create(null));

ruleSets.addFromJson(json);

middle = memUsage();

}

{

const oldRegExp = RegExp;

global.RegExp = function (...args) {

let r = new oldRegExp(...args);

r.test(''); // force engine to compile RegExp

return r;

};

const ruleSets = new RuleSets(Object.create(null));

ruleSets.addFromJson(json);

end = memUsage();

}

// rulesets loaded but regexps are not compiled

console.log('Initial usage:', memToString(start, middle));

// with all regexps compiled

console.log('Maximum usage:', memToString(middle, end));