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() {
+  var foobar = 1;
+  assertEquals(foob\u0061r, 1);
+  assertEquals(foob\u{0061}r, 1);
+  assertEquals(foob\u{61}r, 1);
+  assertEquals(foob\u{0000000061}r, 1);
+})();
+
+(function TestVariableNames2() {
+  var foobar = 1;
+  assertEquals(\u0066oobar, 1);
+  assertEquals(\u{0066}oobar, 1);
+  assertEquals(\u{66}oobar, 1);
+  assertEquals(\u{0000000066}oobar, 1);
+})();
+
+// Unicode escapes in strings.
+
+(function TestStrings() {
+  var s1 = "foob\u0061r";
+  assertEquals(s1, "foobar");
+  var s2 = "foob\u{0061}r";
+  assertEquals(s2, "foobar");
+  var s3 = "foob\u{61}r";
+  assertEquals(s3, "foobar");
+  var s4 = "foob\u{0000000061}r";
+  assertEquals(s4, "foobar");
+})();
+
+
+(function TestSurrogates() {
+  // U+10E6D corresponds to the surrogate pair [U+D803, U+DE6D].
+  var s1 = "foo\u{10e6d}";
+  var s2 = "foo\u{d803}\u{de6d}";
+  assertEquals(s1, s2);
+})();
+
+// Unicode escapes in regexp body. Note that no escapes are allowed in regexp
+// flags.
+
+// FIXME: the test is not yet correct wrt the u regexp flag. The \u{xxxx} style
+// is only allowed when the flag is passed.
+
+(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"));
+  var r3 = /(\u{66}|\u{000062})oo/;
+  assertTrue(r3.test("foo"));
+  assertTrue(r3.test("boo"));
+  assertFalse(r3.test("moo"));
+})();
+
+(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"));
+  var r3 = /[\u{62}-\u{00000066}]oo/;
+  assertTrue(r3.test("foo"));
+  assertTrue(r3.test("boo"));
+  assertFalse(r3.test("moo"));
+}());