lib/utf: remove codepointsToString

pkg/source_maps/lib/span.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.
 
 /// Dart classes representing the souce spans and source files.
 library source_maps.span;
 
-import 'dart:utf' show stringToCodepoints, codepointsToString;
+import 'dart:utf' show stringToCodepoints;
 import 'dart:math' show min;
 
 import 'src/utils.dart';
 
 /// A simple class that describe a segment of source text.
 abstract class Span implements Comparable {
   /// The start location of this span.
   final Location start;
 
   /// The end location of this span, exclusive.
@@ skipping 206 matching lines @@
     return offset - _lineStarts[line];
   }
 
   /// Get the offset for a given line and column
   int getOffset(int line, int column) {
     return _lineStarts[min(line, _lineStarts.length - 1)] + column;
   }
 
   /// Gets the text at the given offsets.
   String getText(int start, [int end]) {
-    return codepointsToString(_decodedChars.sublist(start, end));
+    return new String.fromCharCodes(_decodedChars.sublist(start, end));
   }
 
   /// Create a pretty string representation from a span.
   String getLocationMessage(String message, int start, int end,
       {bool useColors: false, String color}) {
     // TODO(jmesserly): it would be more useful to pass in an object that
     // controls how the errors are printed. This method is a bit too smart.
     var line = getLine(start);
     var column = getColumn(line, start);
 
@@ skipping 75 matching lines @@
     return line == _baseLine ? col + _baseColumn : col;
   }
 
   int getOffset(int line, int column) =>
       super.getOffset(line - _baseLine,
          line == _baseLine ? column - _baseColumn : column) + _baseOffset;
 
   String getText(int start, [int end]) =>
       super.getText(start - _baseOffset, end - _baseOffset);
 }