src/harmony-regexp.js

// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

var $RegExp = global.RegExp;

// -------------------------------------------------------------------

// ES6 draft 12-06-13, section 21.2.5.3
// + https://bugs.ecmascript.org/show_bug.cgi?id=3423
function RegExpGetFlags() {
  if (!IS_SPEC_OBJECT(this)) {
    throw MakeTypeError('flags_getter_non_object',
                        [%ToString(this)]);
  }
  var result = '';
  if (this.global) result += 'g';
  if (this.ignoreCase) result += 'i';
  if (this.multiline) result += 'm';
  if (this.unicode) result += 'u';
  if (this.sticky) result += 'y';
  return result;
}

function ExtendRegExpPrototype() {
  %CheckIsBootstrapping();

  %DefineAccessorPropertyUnchecked($RegExp.prototype, 'flags', RegExpGetFlags,
                                   null, DONT_ENUM);
  %SetNativeFlag(RegExpGetFlags);
}

ExtendRegExpPrototype();