Add string.trimLeft/trimRight.

tests/corelib/string_trimlr_test.dart

+// 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.
+
+import "package:expect/expect.dart";
+
+const WHITESPACE = const [

[Søren Gjesse, 2014/03/10 16:50:03]

A comment for each of these code points would be helpful.

[Lasse Reichstein Nielsen, 2014/03/11 10:36:29]

Done.

+  0x09,
+  0x0A,
+  0x0B,
+  0x0C,
+  0x0D,
+  0x20,
+  0x85,
+  0xA0,
+  0x1680,
+  0x180E,
+  0x2000,
+  0x2001,
+  0x2002,
+  0x2003,
+  0x2004,
+  0x2005,
+  0x2006,
+  0x2007,
+  0x2008,
+  0x2009,
+  0x200A,
+  0x202F,
+  0x205F,
+  0x3000,
+  0x2028,
+  0x2029,
+  0xFEFF,
+];
+
+main() {
+  for (var ws in WHITESPACE) {
+    Expect.equals("", new String.fromCharCode(ws).trim());
+  }
+
+  // Test the whitespace in different positions.
+  test(ws) {
+    // trimLeft
+    Expect.equals("", ws.trimLeft());
+    Expect.equals("", (ws + ws).trimLeft());
+    Expect.equals("a" + ws, ("a" + ws).trimLeft());
+    Expect.equals("a", (ws + "a").trimLeft());
+    Expect.equals("a" + ws + ws, (ws + ws + "a" + ws + ws).trimLeft());
+    Expect.equals("a" + ws + "a", (ws + ws + "a" + ws + "a").trimLeft());
+    // trimRight
+    Expect.equals("", ws.trimRight());
+    Expect.equals("", (ws + ws).trimRight());
+    Expect.equals("a", ("a" + ws).trimRight());
+    Expect.equals(ws + "a", (ws + "a").trimRight());
+    Expect.equals(ws + ws + "a", (ws + ws + "a" + ws + ws).trimRight());
+    Expect.equals("a" + ws + "a", ("a" + ws + "a" + ws + ws).trimRight());
+  }
+
+  for (var ws in WHITESPACE) {
+    var c = new String.fromCharCode(ws);
+    test(c);
+  }
+  test(new String.fromCharCodes(WHITESPACE));
+}