Add boolean parse

sdk/lib/core/bool.dart

@@ -124,8 +124,8 @@ class bool {
   /// ```dart
   /// print(int.tryParse('true'));  // true
   /// print(int.tryParse('TRUE'));  // true
-  /// print(int.tryParse('false')); // false
-  /// print(int.tryParse('FALSE')); // false
+  /// print(int.tryParse('false', caseSensitive: true)); // false
+  /// print(int.tryParse('FALSE', caseSensitive: true)); // false
   /// print(int.tryParse('NO')); // FormatException
   /// print(int.tryParse('YES')); // FormatException
   /// print(int.tryParse('0')); // FormatException

tests/corelib/bool_parse_test.dart

@@ -0,0 +1,19 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// SharedOptions=-Da=true -Db=false -Dc=NOTBOOL -Dd=True
+
+import "package:expect/expect.dart";
+
+main() {
+  Expect.isTrue(const bool.parse('true'));
+  Expect.isFalse(const bool.parse('false'));
+  Expect.isTrue(const bool.parse('TRUE', caseSensitive: true));
+  Expect.isFalse(const bool.parse('FALSE', caseSensitive: true));
+  Expect.throws(()=> bool.parse('True'));
+  Expect.throws(()=> bool.parse('False'));
+  Expect.throws(()=> bool.parse('y'));
+  Expect.throws(()=> bool.parse('n'));
+  Expect.throws(()=> bool.parse('0'));
+  Expect.throws(()=> bool.parse('1'));
+}

tests/corelib/bool_try_parse_test.dart

@@ -0,0 +1,22 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// SharedOptions=-Da=true -Db=false -Dc=NOTBOOL -Dd=True
+
+import "package:expect/expect.dart";
+
+main() {
+  Expect.isTrue(const bool.tryParse('true'));
+  Expect.isFalse(const bool.tryParse('false'));
+  Expect.isTrue(const bool.tryParse('TRUE', caseSensitive: true));
+  Expect.isFalse(const bool.tryParse('FALSE', caseSensitive: true));
+
+  Expect.isNull(const bool.tryParse('TRUE'));
+  Expect.isNull(const bool.tryParse('FALSE'));
+  Expect.isNull(const bool.tryParse('y'));
+  Expect.isNull(const bool.tryParse('n'));
+  Expect.isNull(const bool.tryParse(' true ', caseSensitive: true));
+  Expect.isNull(const bool.tryParse(' false ', caseSensitive: true));
+  Expect.isNull(const bool.tryParse('0', caseSensitive: true));
+  Expect.isNull(const bool.tryParse('1', caseSensitive: true));
+}