Add normalizePath to Uri class.

sdk/lib/core/uri.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.
 
 part of dart.core;
 
 /**
  * A parsed URI, such as a URL.
  *
  * **See also:**
@@ skipping 963 matching lines @@
    * The returned map is unmodifiable and will throw [UnsupportedError] on any
    * calls that would mutate it.
    */
   Map<String, String> get queryParameters {
     if (_queryParameters == null) {
       _queryParameters = new UnmodifiableMapView(splitQueryString(query));
     }
     return _queryParameters;
   }
 
+  /**
+   * Returns an URI where the path has been normalized.
+   *
+   * A normalized path does not contain `.` segments or non-leading `..`
+   * segments.
+   * Only a relative path may contain leading `..` segments,
+   * a path that starts with `/` will also drop any leading `..` segments.
+   *
+   * This uses the same normalization strategy as [resolveUri], as specified by
+   * RFC 3986.
+   *
+   * Does not change any part of the URI except the path.
+   */
+  Uri normalizePath() {
+    String path = _removeDotSegments(_path);
+    if (identical(path, _path)) return this;
+    return this.replace(path: path);
+  }
+
   static int _makePort(int port, String scheme) {
     // Perform scheme specific normalization.
     if (port != null && port == _defaultPort(scheme)) return null;
     return port;
   }
 
   /**
-   * Check and normalize a most name.
+   * Check and normalize a host name.
    *
    * If the host name starts and ends with '[' and ']', it is considered an
    * IPv6 address. If [strictIPv6] is false, the address is also considered
    * an IPv6 address if it contains any ':' character.
    *
    * If it is not an IPv6 address, it is case- and escape-normalized.
    * This escapes all characters not valid in a reg-name,
    * and converts all non-escape upper-case letters to lower-case.
    */
   static String _makeHost(String host, int start, int end, bool strictIPv6) {
@@ skipping 1406 matching lines @@
       0xafff,   // 0x30 - 0x3f  1111111111110101
                 //              @ABCDEFGHIJKLMNO
       0xffff,   // 0x40 - 0x4f  1111111111111111
                 //              PQRSTUVWXYZ    _
       0x87ff,   // 0x50 - 0x5f  1111111111100001
                 //               abcdefghijklmno
       0xfffe,   // 0x60 - 0x6f  0111111111111111
                 //              pqrstuvwxyz   ~
       0x47ff];  // 0x70 - 0x7f  1111111111100010
 }