Implement ES6 unicode escapes.

test/mjsunit/es6/unicode-escapes.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.
+
+// ES6 extends the \uxxxx escape and also allows \u{xxxx}.
+
+// Unicode escapes in variable names.
+
+function TestVariableNames1() {

[arv (Not doing code reviews), 2014/11/07 16:23:20]

Or

(function TestVariableNames1() {
   ...
})();

less likely to have typos in the name cause tests to not run.

[marja, 2014/11/13 11:53:20]

Done.

+  var foobar = 1;
+  assertEquals(foob\u0061r, 1);
+  assertEquals(foob\u{0061}r, 1);
+}
+TestVariableNames1();
+
+function TestVariableNames2() {
+  var foobar = 1;
+  assertEquals(\u0066oobar, 1);
+  assertEquals(\u{0066}oobar, 1);
+}
+TestVariableNames2();
+
+// Unicode escapes in strings.
+
+function TestStrings() {
+  var s1 = "foob\u0061r";
+  assertEquals(s1, "foobar");
+  var s2 = "foob\u{0061}r";

[arv (Not doing code reviews), 2014/11/07 16:23:20]

var s2 = "foob\u{61}r";

[marja, 2014/11/13 11:53:20]

Done.

+  assertEquals(s2, "foobar");
+}
+TestStrings();
+
+// Unicode escapes in regexp body. Note that no escapes are allowed in regexp
+// flags.

[mathias, 2014/11/07 16:37:57]

`u{…}` escapes are only allowed in regular expressions when the `u` flag is set
– they should throw otherwise.

[marja, 2014/11/13 11:53:20]

Regexp escapes will be added in a separate CL.

+
+function TestRegexp1() {
+  var r1 = /(\u0066|\u0062)oo/;
+  assertTrue(r1.test("foo"));
+  assertTrue(r1.test("boo"));
+  assertFalse(r1.test("moo"));
+  var r2 = /(\u{0066}|\u{0062})oo/;
+  assertTrue(r2.test("foo"));
+  assertTrue(r2.test("boo"));
+  assertFalse(r2.test("moo"));
+}
+TestRegexp1();
+
+function TestRegexp2() {
+  var r1 = /[\u0062-\u0066]oo/;
+  assertTrue(r1.test("foo"));
+  assertTrue(r1.test("boo"));
+  assertFalse(r1.test("moo"));
+  var r2 = /[\u{0062}-\u{0066}]oo/;
+  assertTrue(r2.test("foo"));
+  assertTrue(r2.test("boo"));
+  assertFalse(r2.test("moo"));
+}
+TestRegexp2();