Improve [relativize] for Windows.

dart/tests/compiler/dart2js/uri_extras_test.dart

+// Copyright (c) 2012, 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('dart:uri');
+
+#import('../../../lib/compiler/implementation/util/uri_extras.dart');
+
+
+void testRelativize() {
+  void c(String expected, String base, String path, bool isWindows) {
+    if (isWindows === null) {
+      c(expected, base, path, true);
+      c(expected, base, path, false);
+      return;
+    }
+    String r;
+
+    r = relativize(new Uri.fromString('file:$base'),
+                   new Uri.fromString('file:$path'),
+                   isWindows);
+    Expect.stringEquals(expected, r);
+
+    r = relativize(new Uri.fromString('FILE:$base'),
+                   new Uri.fromString('FILE:$path'),
+                   isWindows);
+    Expect.stringEquals(expected, r);
+
+    r = relativize(new Uri.fromString('file:$base'),
+                   new Uri.fromString('FILE:$path'),
+                   isWindows);
+    Expect.stringEquals(expected, r);
+
+    r = relativize(new Uri.fromString('FILE:$base'),
+                   new Uri.fromString('file:$path'),
+                   isWindows);
+    Expect.stringEquals(expected, r);
+  }
+  c('bar', '/', '/bar', null);
+  c('/bar', '/foo', '/bar', null);
+  c('/bar', '/foo/', '/bar', null);
+
+  c('bar', '///c:/', '///c:/bar', true);
+  c('/c:/bar', '///c:/foo', '///c:/bar', true);
+  c('/c:/bar', '///c:/foo/', '///c:/bar', true);
+
+  c('BAR', '///c:/', '///c:/BAR', true);
+  c('/c:/BAR', '///c:/foo', '///c:/BAR', true);
+  c('/c:/BAR', '///c:/foo/', '///c:/BAR', true);
+
+  c('../lib/compiler/implementation/dart2js.dart',
+    '///C:/Users/person/dart_checkout_for_stuff/dart/ReleaseIA32/dart.exe',
+    '///c:/Users/person/dart_checkout_for_stuff/dart/lib/compiler/'
+    'implementation/dart2js.dart',
+    true);
+
+  c('/Users/person/file.dart', '/users/person/', '/Users/person/file.dart',
+    false);
+
+  c('file.dart', '/Users/person/', '/Users/person/file.dart', null);
+
+  c('../person/file.dart', '/Users/other/', '/Users/person/file.dart', false);
+
+  c('/Users/person/file.dart', '/Users/other/', '/Users/person/file.dart',
+    true);
+}
+
+void main() {
+  testRelativize();
+}