Small tweaks for AnalysisDriver and FileState.

pkg/analyzer/lib/src/dart/analysis/file_state.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 176 matching lines @@
 
   /**
    * The list of files this file imports.
    */
   List<FileState> get importedFiles => _importedFiles;
 
   /**
    * Return `true` if the file does not have a `library` directive, and has a
    * `part of` directive, so is probably a part.
    */
-  bool get isPart => _unlinked.libraryNameOffset == 0 &&  _unlinked.isPartOf;
+  bool get isPart => _unlinked.libraryNameOffset == 0 && _unlinked.isPartOf;
 
   /**
    * If the file [isPart], return a currently know library the file is a part
    * of. Return `null` if a library is not known, for example because we have
    * not processed a library file yet.
    */
   FileState get library {
     List<FileState> libraries = _fsState._partToLibraries[this];
     if (libraries == null || libraries.isEmpty) {
       return null;
@@ skipping 278 matching lines @@
   }
 
   @override
   String toString() => path;
 
   /**
    * Return the [FileState] for the given [relativeUri], or `null` if the URI
    * cannot be parsed, cannot correspond any file, etc.
    */
   FileState _fileForRelativeUri(String relativeUri) {
-    Uri absoluteUri;
-    try {
-      absoluteUri = resolveRelativeUri(uri, Uri.parse(relativeUri));
-    } on FormatException catch (e) {
-      return null;
-    }
+    Uri absoluteUri = resolveRelativeUri(uri, Uri.parse(relativeUri));
     return _fsState.getFileForUri(absoluteUri);
   }
 
   /**
    * Return `true` if the given byte lists are equal.
    */
   static bool _equalByteLists(List<int> a, List<int> b) {
     if (a == null) {
       return b == null;
     } else if (b == null) {
@@ skipping 199 matching lines @@
         .where((f) => f._transitiveFiles == null)
         .toSet();
   }
 
   Set<FileState> get filesWithoutTransitiveSignature {
     return state._uriToFile.values
         .where((f) => f._transitiveSignature == null)
         .toSet();
   }
 }