Add minimal yaml support to the engine

pkg/analyzer/lib/src/generated/source.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.src.generated.source;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 182 matching lines @@
    */
   int _previousLine = 0;
 
   /**
    * Initialize a newly created set of line information to represent the data
    * encoded in the given list of [_lineStarts].
    */
   factory LineInfo(List<int> _lineStarts) => new LineInfoWithCount(_lineStarts);
 
   /**
+   * Initialize a newly created set of line information corresponding to the
+   * given file [content].
+   */
+  factory LineInfo.fromContent(String content) =>
+      new LineInfoWithCount(StringUtilities.computeLineStarts(content));
+
+  /**
    * Initialize a newly created set of line information to represent the data
    * encoded in the given list of [_lineStarts].
    */
   LineInfo._(this._lineStarts) {
     if (_lineStarts == null) {
       throw new IllegalArgumentException("lineStarts must be non-null");
     } else if (_lineStarts.length < 1) {
       throw new IllegalArgumentException("lineStarts must be non-empty");
     }
   }
@@ skipping 904 matching lines @@
   Source resolveAbsolute(Uri uri, [Uri actualUri]);
 
   /**
    * Return an absolute URI that represents the given [source], or `null` if a
    * valid URI cannot be computed.
    *
    * The computation should be based solely on [source.fullName].
    */
   Uri restoreAbsolute(Source source) => null;
 }