Check for duplicate library names

lib/src/utils.dart

 // Copyright (c) 2015, 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.
 
 /// Holds a couple utility functions used at various places in the system.
 library dev_compiler.src.utils;
 
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
@@ skipping 31 matching lines @@
 /// Choose a canonical name from the library element. This is safe to use as a
 /// namespace in JS and Dart code generation.  This never uses the library's
 /// name (the identifier in the `library` declaration) as it doesn't have any
 /// meaningful rules enforced.
 String canonicalLibraryName(LibraryElement library) {
   var uri = library.source.uri;
   var name = path.basenameWithoutExtension(uri.pathSegments.last);
   return _toIdentifier(name);
 }
 
+String canonicalLibraryUri(LibraryElement library) {
+  return '${library.source.uri}';
+}
+
 /// Escape [name] to make it into a valid identifier.
 String _toIdentifier(String name) {
   if (name.length == 0) return r'$';
 
   // Escape any invalid characters
   StringBuffer buffer = null;
   for (int i = 0; i < name.length; i++) {
     var ch = name[i];
     var needsEscape = ch == r'$' || _invalidCharInIdentifier.hasMatch(ch);
     if (needsEscape && buffer == null) {
@@ skipping 399 matching lines @@
   int lineEnd = endLoc.offset;
   int unitEnd = unit.endToken.end;
   int lineNum = lineInfo.getLocation(lineEnd).lineNumber;
   while (lineEnd < unitEnd &&
       lineInfo.getLocation(++lineEnd).lineNumber == lineNum);
 
   var text = content.substring(start, end);
   var lineText = content.substring(lineStart, lineEnd);
   return new SourceSpanWithContext(startLoc, endLoc, text, lineText);
 }