Split core file tracking functionality from AnalysisDriver.

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

 // Copyright (c) 2017, 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 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart' show CompilationUnitElement;
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/dart/analysis/byte_store.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
+import 'package:analyzer/src/dart/analysis/file_tracker.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisEngine, AnalysisOptions;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/task/dart.dart' show COMPILATION_UNIT_ELEMENT;
 import 'package:analyzer/task/dart.dart' show LibrarySpecificUnit;
 
@@ skipping 14 matching lines @@
    * Create a [LibraryContext] which is prepared to analyze [library].
    */
   factory LibraryContext.forSingleLibrary(
       FileState library,
       PerformanceLog logger,
       PackageBundle sdkBundle,
       ByteStore byteStore,
       AnalysisOptions options,
       DeclaredVariables declaredVariables,
       SourceFactory sourceFactory,
-      FileSystemState fsState) {
+      FileTracker fileTracker) {
     return logger.run('Create library context', () {
       Map<String, FileState> libraries = <String, FileState>{};
       SummaryDataStore store = new SummaryDataStore(const <String>[]);
 
       if (sdkBundle != null) {
         store.addBundle(null, sdkBundle);
       }
 
       void appendLibraryFiles(FileState library) {
         if (!libraries.containsKey(library.uriStr)) {
@@ skipping 55 matching lines @@
       linkedLibraries.forEach((uri, linkedBuilder) {
         FileState library = libraries[uri];
         String key = '${library.transitiveSignature}.linked';
         List<int> bytes = linkedBuilder.toBuffer();
         LinkedLibrary linked = new LinkedLibrary.fromBuffer(bytes);
         store.addLinkedLibrary(uri, linked);
         byteStore.put(key, bytes);
       });
 
       var analysisContext = _createAnalysisContext(
-          options, declaredVariables, sourceFactory, fsState, store);
+          options, declaredVariables, sourceFactory, fileTracker, store);
 
       return new LibraryContext._(analysisContext);
     });
   }
 
   LibraryContext._(this._analysisContext);
 
   /**
    * Computes a [CompilationUnitElement] for the given library/unit pair.
    */
@@ skipping 21 matching lines @@
     CompilationUnit resolvedUnit =
         _analysisContext.resolveCompilationUnit2(unitSource, librarySource);
     List<AnalysisError> errors = _analysisContext.computeErrors(unitSource);
     return new ResolutionResult(resolvedUnit, errors);
   }
 
   static AnalysisContext _createAnalysisContext(
       AnalysisOptions _analysisOptions,
       DeclaredVariables declaredVariables,
       SourceFactory _sourceFactory,
-      FileSystemState _fsState,
+      FileTracker fileTracker,
       SummaryDataStore store) {
     AnalysisContextImpl analysisContext =
         AnalysisEngine.instance.createAnalysisContext();
     analysisContext.useSdkCachePartition = false;
     analysisContext.analysisOptions = _analysisOptions;
     analysisContext.declaredVariables.addAll(declaredVariables);
     analysisContext.sourceFactory = _sourceFactory.clone();
-    analysisContext.contentCache = new _ContentCacheWrapper(_fsState);
+    analysisContext.contentCache = new _ContentCacheWrapper(fileTracker);
     analysisContext.resultProvider =
         new InputPackagesResultProvider(analysisContext, store);
     return analysisContext;
   }
 }
 
 /**
  * Container object holding the result of a call to
  * [LibraryContext.resolveUnit].
  */
 class ResolutionResult {
   final CompilationUnit resolvedUnit;
   final List<AnalysisError> errors;
 
   ResolutionResult(this.resolvedUnit, this.errors);
 }
 
 /**
  * [ContentCache] wrapper around [FileContentOverlay].
  */
 class _ContentCacheWrapper implements ContentCache {
-  final FileSystemState fsState;
+  final FileTracker fileTracker;
 
-  _ContentCacheWrapper(this.fsState);
+  _ContentCacheWrapper(this.fileTracker);
 
   @override
   void accept(ContentCacheVisitor visitor) {
     throw new UnimplementedError();
   }
 
   @override
   String getContents(Source source) {
     return _getFileForSource(source).content;
   }
@@ skipping 14 matching lines @@
     return _getFileForSource(source).exists ? 0 : -1;
   }
 
   @override
   String setContents(Source source, String contents) {
     throw new UnimplementedError();
   }
 
   FileState _getFileForSource(Source source) {
     String path = source.fullName;
-    return fsState.getFileForPath(path);
+    return fileTracker.fsState.getFileForPath(path);
   }
 }