[regexp] implement case-insensitive unicode regexps.

test/mjsunit/harmony/unicode-regexp-ignore-case.js

Index: test/mjsunit/harmony/unicode-regexp-ignore-case.js
diff --git a/test/mjsunit/harmony/unicode-regexp-ignore-case.js b/test/mjsunit/harmony/unicode-regexp-ignore-case.js
new file mode 100644
index 0000000000000000000000000000000000000000..7e930745bf4cc6a5fa292d116bcd541bc90af03d
--- /dev/null
+++ b/test/mjsunit/harmony/unicode-regexp-ignore-case.js
@@ -0,0 +1,54 @@
+// Copyright 2016 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-unicode-regexps
+
+// Non-unicode use toUpperCase mappings.
+assertFalse(/[\u00e5]/i.test("\u212b"));
+assertFalse(/[\u212b]/i.test("\u00e5\u1234"));
+assertFalse(/[\u212b]/i.test("\u00e5"));
+
+assertTrue("\u212b".toLowerCase() == "\u00e5");
+assertTrue("\u00c5".toLowerCase() == "\u00e5");
+assertTrue("\u00e5".toUpperCase() == "\u00c5");
+
+// Unicode uses case folding mappings.
+assertTrue(/\u00e5/ui.test("\u212b"));
+assertTrue(/\u00e5/ui.test("\u00c5"));
+assertTrue(/\u00e5/ui.test("\u00e5"));
+assertTrue(/\u00e5/ui.test("\u212b"));
+assertTrue(/\u00c5/ui.test("\u00e5"));
+assertTrue(/\u00c5/ui.test("\u212b"));
+assertTrue(/\u00c5/ui.test("\u00c5"));
+assertTrue(/\u212b/ui.test("\u00c5"));
+assertTrue(/\u212b/ui.test("\u00e5"));
+assertTrue(/\u212b/ui.test("\u212b"));
+
+// Non-BMP.
+assertFalse(/\u{10400}/i.test("\u{10428}"));
+assertTrue(/\u{10400}/ui.test("\u{10428}"));
+assertTrue(/\ud801\udc00/ui.test("\u{10428}"));
+assertTrue(/[\u{10428}]/ui.test("\u{10400}"));
+assertTrue(/[\ud801\udc28]/ui.test("\u{10400}"));
+assertEquals(["\uff21\u{10400}"],
+             /[\uff40-\u{10428}]+/ui.exec("\uff21\u{10400}abc"));
+assertEquals(["abc"], /[^\uff40-\u{10428}]+/ui.exec("\uff21\u{10400}abc\uff23"));
+assertEquals(["\uff53\u24bb"],
+             /[\u24d5-\uff33]+/ui.exec("\uff54\uff53\u24bb\u24ba"));
+
+// Full mappings are ignored.
+assertFalse(/\u00df/ui.test("SS"));
+assertFalse(/\u1f8d/ui.test("\u1f05\u03b9"));
+
+// Simple mappings work.
+assertTrue(/\u1f8d/ui.test("\u1f85"));
+
+// Common mappings work.
+assertTrue(/\u1f6b/ui.test("\u1f63"));
+
+// Back references.
+assertEquals(["\u00e5\u212b\u00c5", "\u00e5"],
+             /(.)\1\1/ui.exec("\u00e5\u212b\u00c5"));
+assertEquals(["\u{118aa}\u{118ca}", "\u{118aa}"],
+             /(.)\1/ui.exec("\u{118aa}\u{118ca}"));