Port regexp tests from V8 to Dart.

tests/corelib/regexp/invalid-range-in-class_test.dart

+// Copyright (c) 2014, the Dart project authors. All rights reserved.
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  Redistributions in binary form must reproduce the above copyright
+//     notice, this list of conditions and the following disclaimer in the
+//     documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import 'v8_regexp_utils.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  description(
+  "This page tests invalid character ranges in character classes."
+  );
+
+  // These test a basic range / non range.
+  shouldBe(new RegExp(r"[a-c]+").firstMatch("-acbd"), ["acb"]);
+  shouldBe(new RegExp(r"[a\-c]+").firstMatch("-acbd"), ["-ac"]);
+
+  // A reverse-range is invalid.
+  assertThrows(() => new RegExp(r"[c-a]+").firstMatch("-acbd"));
+
+  // A character-class in a range is invalid, according to ECMA-262, but we allow it.
+  shouldBe(new RegExp(r"[\d-x]+").firstMatch("1-3xy"), ["1-3x"]);
+  shouldBe(new RegExp(r"[x-\d]+").firstMatch("1-3xy"), ["1-3x"]);
+  shouldBe(new RegExp(r"[\\d-\d]+").firstMatch("1-3xy"), ["1-3"]);
+
+  // Whilst we break with ECMA-262's definition of CharacterRange, we do comply with
+  // the grammar, and as such in the following regex a-z cannot be matched as a range.
+  shouldBe(new RegExp(r"[\d-a-z]+").firstMatch("az1-3y"), ["az1-3"]);
+
+  // An escaped hypen should not be confused for an invalid range.
+  shouldBe(new RegExp(r"[\d\-x]+").firstMatch("1-3xy"), ["1-3x"]);
+  shouldBe(new RegExp(r"[x\-\d]+").firstMatch("1-3xy"), ["1-3x"]);
+  shouldBe(new RegExp(r"[\d\-\d]+").firstMatch("1-3xy"), ["1-3"]);
+
+  // A hyphen after a character-class is not invalid.
+  shouldBe(new RegExp(r"[\d-]+").firstMatch("1-3xy"), ["1-3"]);
+}