var fails = require('../internals/fails');
var global = require('../internals/global');

// babel-minify and Closure Compiler transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError
var $RegExp = global.RegExp;

var UNSUPPORTED_Y = fails(function () {
  var re = $RegExp('a', 'y');
  re.lastIndex = 2;
  return re.exec('abcd') != null;
});

// UC Browser bug
// https://github.com/zloirock/core-js/issues/1008
var MISSED_STICKY = UNSUPPORTED_Y || fails(function () {
  return !$RegExp('a', 'y').sticky;
});

var BROKEN_CARET = UNSUPPORTED_Y || fails(function () {
  // https://bugzilla.mozilla.org/show_bug.cgi?id=773687
  var re = $RegExp('^r', 'gy');
  re.lastIndex = 2;
  return re.exec('str') != null;
});

module.exports = {
  BROKEN_CARET: BROKEN_CARET,
  MISSED_STICKY: MISSED_STICKY,
  UNSUPPORTED_Y: UNSUPPORTED_Y
};