test/mjsunit/es6/regexp-flags.js

// Copyright 2015 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.

// Flags: --harmony-regexps --harmony-unicode-regexps

var r1 = /abc/gi;
assertEquals("abc", r1.source);
assertTrue(r1.global);
assertTrue(r1.ignoreCase);
assertFalse(r1.multiline);
assertFalse(r1.sticky);
assertFalse(r1.unicode);

// Internal slot of prototype is not read.
var r2 = { __proto__: r1 };
assertThrows(function() { r2.source; }, TypeError);
assertThrows(function() { r2.global; }, TypeError);
assertThrows(function() { r2.ignoreCase; }, TypeError);
assertThrows(function() { r2.multiline; }, TypeError);
assertThrows(function() { r2.sticky; }, TypeError);
assertThrows(function() { r2.unicode; }, TypeError);

var r3 = /I/;
var string = "iIiIi";
var expected = "iXiIi";
assertFalse(r3.global);
assertFalse(r3.ignoreCase);
assertEquals("", r3.flags);
assertEquals(expected, string.replace(r3, "X"));

var get_count = 0;
Object.defineProperty(r3, "global", {
  get: function() { get_count++; return true; }
});
Object.defineProperty(r3, "ignoreCase", {
  get: function() { get_count++; return true; }
});

assertTrue(r3.global);
assertEquals(1, get_count);
assertTrue(r3.ignoreCase);
assertEquals(2, get_count);
// Overridden flag getters affects the flags getter.
assertEquals("gi", r3.flags);
assertEquals(4, get_count);
// Overridden flag getters do not affect the internal flags.
assertEquals(expected, string.replace(r3, "X"));
assertEquals(4, get_count);


function testName(name) {
  // TODO(littledan): For web compatibility, we don't throw an exception,
  // but ES2015 expects an exception to be thrown from this getter.
  assertEquals(undefined, RegExp.prototype[name]);
  assertEquals(
      "get " + name,
      Object.getOwnPropertyDescriptor(RegExp.prototype, name).get.name);
}

testName("global");
testName("ignoreCase");
testName("multiline");
testName("source");
testName("sticky");
testName("unicode");