Gracefully handle IO exceptions while resolving URIs (issue 23023)

pkg/analyzer/lib/src/generated/engine.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import "dart:math" as math;
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/cancelable_future.dart';
 import 'package:analyzer/src/generated/incremental_resolution_validator.dart';
+import 'package:analyzer/src/plugin/engine_plugin.dart';
 import 'package:analyzer/src/services/lint.dart';
 import 'package:analyzer/src/task/task_dart.dart';
 
 import '../../instrumentation/instrumentation.dart';
 import 'ast.dart';
 import 'constant.dart';
 import 'element.dart';
 import 'error.dart';
 import 'error_verifier.dart';
 import 'html.dart' as ht;
 import 'incremental_resolver.dart'
     show IncrementalResolver, PoorMansIncrementalResolver;
 import 'incremental_scanner.dart';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'parser.dart' show Parser, IncrementalParser;
 import 'resolver.dart';
 import 'scanner.dart';
 import 'sdk.dart' show DartSdk;
 import 'source.dart';
 import 'utilities_collection.dart';
 import 'utilities_general.dart';
-import 'package:analyzer/src/plugin/engine_plugin.dart';
 
 /**
  * Used by [AnalysisOptions] to allow function bodies to be analyzed in some
  * sources but not others.
  */
 typedef bool AnalyzeFunctionBodiesPredicate(Source source);
 
 /**
  * Type of callback functions used by PendingFuture.  Functions of this type
  * should perform a computation based on the data in [sourceEntry] and return
@@ skipping 9346 matching lines @@
       UriBasedDirective directive, AnalysisErrorListener errorListener) {
     StringLiteral uriLiteral = directive.uri;
     String uriContent = uriLiteral.stringValue;
     if (uriContent != null) {
       uriContent = uriContent.trim();
       directive.uriContent = uriContent;
     }
     UriValidationCode code = directive.validate();
     if (code == null) {
       String encodedUriContent = Uri.encodeFull(uriContent);
-      Source source =
-          context.sourceFactory.resolveUri(librarySource, encodedUriContent);
-      directive.source = source;
-      return source;
+      try {
+        Source source =
+            context.sourceFactory.resolveUri(librarySource, encodedUriContent);
+        directive.source = source;
+        return source;
+      } on JavaIOException {
+        code = UriValidationCode.INVALID_URI;
+      }
     }
     if (code == UriValidationCode.URI_WITH_DART_EXT_SCHEME) {
       return null;
     }
     if (code == UriValidationCode.URI_WITH_INTERPOLATION) {
       errorListener.onError(new AnalysisError.con2(librarySource,
           uriLiteral.offset, uriLiteral.length,
           CompileTimeErrorCode.URI_WITH_INTERPOLATION));
       return null;
     }
@@ skipping 2220 matching lines @@
   visitElement(Element element) {
     if (element.id == _id) {
       result = element;
       throw new _ElementByIdFinderException();
     }
     super.visitElement(element);
   }
 }
 
 class _ElementByIdFinderException {}