bowser_refactoring_example.js

import Utils from './utils.js';

const browsersNames = [
  /* Googlebot */
  {
    test: [/googlebot/i],
    name: 'Googlebot',
  },
];

const browsersVersions = {
    'Googlebot': function(ua) {
      return Utils.getFirstMatch(/googlebot\/(\d+(\.\d+))/i, ua) || Utils.getFirstMatch(commonVersionIdentifier, ua);
    }
}

class Parser {
  parseName() {
    this.name = '';
    for (let i = 0; i < browsersNames.length; i++) {
      let browser = browsersNames[i]
      if (typeof browser.test === 'function' && browser.test(this)) {
        return this.name = browser.name
      }

      if (browser.test instanceof Array) {
        for (let j = 0; j < browser.test.length; j++) {
          let regex = browser.test[j]
          if (regex.test(this.getUA())) {
            return this.name = browser.name
          }
        }
      }
    }
    return '';
  }

  parseVersion() {
    if (!this.name || this.name == '') this.name = parseName()
    if (!browsersVersions[this.name]) return 'Unknown'
    return browsersVersions[this.name](this.getUA())
  }
}