Connect analyzer's AnalysisError object to front_end's CompilationError.

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';
 import 'package:analyzer/src/context/source.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/java_io.dart' show JavaFile;
 import 'package:analyzer/src/generated/sdk.dart' show DartSdk;
 import 'package:analyzer/src/generated/source_io.dart' show FileBasedSource;
 import 'package:front_end/src/base/source.dart';
 import 'package:front_end/src/base/uri_kind.dart';
 import 'package:package_config/packages.dart';
 import 'package:path/path.dart' as pathos;
+import 'package:source_span/source_span.dart' as source_span;
 
 export 'package:front_end/src/base/source.dart' show Source;
 export 'package:front_end/src/base/uri_kind.dart' show UriKind;
 
 /**
  * A function that is used to visit [ContentCache] entries.
  */
 typedef void ContentCacheVisitor(String fullPath, int stamp, String contents);
 
 /**
@@ skipping 332 matching lines @@
 
 class LocalSourcePredicate_TRUE implements LocalSourcePredicate {
   @override
   bool isLocal(Source source) => true;
 }
 
 /**
  * An implementation of an non-existing [Source].
  */
 class NonExistingSource extends Source {
+  source_span.SourceFile _sourceFile;
+
   @override
   final String fullName;
 
   @override
   final Uri uri;
 
   @override
   final UriKind uriKind;
 
   NonExistingSource(this.fullName, this.uri, this.uriKind);
@@ skipping 12 matching lines @@
   @override
   bool get isInSystemLibrary => false;
 
   @override
   int get modificationStamp => -1;
 
   @override
   String get shortName => pathos.basename(fullName);
 
   @override
+  source_span.SourceFile get sourceFile =>
+      _sourceFile ??= new source_span.SourceFile('', url: uri);
+
+  @override
   bool operator ==(Object other) {
     if (other is NonExistingSource) {
       return other.uriKind == uriKind && other.fullName == fullName;
     }
     return false;
   }
 
   @override
   bool exists() => false;
 }
@@ skipping 327 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;
 }