Reverting 9094

utils/pub/utils.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.
 
 /**
  * Generic utility functions. Stuff that should possibly be in core.
  */
 #library('utils');
 
 /** Thrown by methods that parse text when the text isn't a valid. */
 class FormatException implements Exception {
   final String message;
 
   FormatException(this.message);
 
   String toString() => message;
 }
 
-/** A pair of values. */
-class Pair<E, F> {
-  E first;
-  F last;
-
-  Pair(this.first, this.last);
-
-  String toString() => '($first, $last)';
-}
-
 // TODO(rnystrom): Move into String?
 /** Pads [source] to [length] by adding spaces at the end. */
 String padRight(String source, int length) {
   final result = new StringBuffer();
   result.add(source);
 
   while (result.length < length) {
     result.add(' ');
   }
 
@@ skipping 34 matching lines @@
 /**
  * Asserts that [iter] contains only one element, and returns it.
  */
 only(Iterable iter) {
   var iterator = iter.iterator();
   assert(iterator.hasNext());
   var obj = iterator.next();
   assert(!iterator.hasNext());
   return obj;
 }
-
-/**
- * Replace each instance of [matcher] in [source] with the return value of [fn].
- */
-String replace(String source, Pattern matcher, String fn(Match)) {
-  var buffer = new StringBuffer();
-  var start = 0;
-  for (var match in matcher.allMatches(source)) {
-    buffer.add(source.substring(start, match.start()));
-    start = match.end();
-    buffer.add(fn(match));
-  }
-  buffer.add(source.substring(start));
-  return buffer.toString();
-}