Remove memento.

pkg/analyzer/lib/src/task/dart.dart

 // Copyright (c) 2015, 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.task.dart;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/error_verifier.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/general.dart';
-import 'package:analyzer/src/task/incremental_element_builder.dart';
 import 'package:analyzer/src/task/model.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/model.dart';
 
 /**
  * The [ResultCachingPolicy] for ASTs.
  */
 const ResultCachingPolicy AST_CACHING_POLICY =
     const SimpleResultCachingPolicy(256, 64);
@@ skipping 534 matching lines @@
       }
       for (int i = argumentCount; i < parameterCount; i++) {
         types[i] = dynamic;
       }
     }
     return types;
   }
 }
 
 /**
- * The memento for [BuildCompilationUnitElementTask].
- */
-class BuildCompilationUnitElementMemento {
-  final List<ClassElement> classElements;
-  final CompilationUnit unit;
-  final CompilationUnitElement unitElement;
-  BuildCompilationUnitElementMemento(
-      this.classElements, this.unit, this.unitElement);
-}
-
-/**
  * A task that builds a compilation unit element for a single compilation unit.
  */
 class BuildCompilationUnitElementTask extends SourceBasedAnalysisTask {
   /**
    * The name of the input whose value is the AST for the compilation unit.
    */
   static const String PARSED_UNIT_INPUT_NAME = 'PARSED_UNIT_INPUT_NAME';
 
   /**
    * The task descriptor describing this kind of task.
@@ skipping 18 matching lines @@
   TaskDescriptor get descriptor => DESCRIPTOR;
 
   @override
   void internalPerform() {
     //
     // Prepare inputs.
     //
     Source source = getRequiredSource();
     CompilationUnit unit = getRequiredInput(PARSED_UNIT_INPUT_NAME);
     //
-    // Use memento.
-    //
-    if (inputMemento is BuildCompilationUnitElementMemento) {
-      BuildCompilationUnitElementMemento memento = inputMemento;
-      unit = AstCloner.clone(unit);
-      new IncrementalCompilationUnitElementBuilder(memento.unit, unit).build();
-      CompilationUnitElement element = unit.element;
-      outputs[CLASS_ELEMENTS] = element.types;
-      outputs[COMPILATION_UNIT_ELEMENT] = element;
-      outputs[RESOLVED_UNIT1] = unit;
-      outputMemento =
-          new BuildCompilationUnitElementMemento(element.types, unit, element);
-      return;
-    }
-    //
     // Process inputs.
     //
     unit = AstCloner.clone(unit);
     CompilationUnitBuilder builder = new CompilationUnitBuilder();
     CompilationUnitElement element = builder.buildCompilationUnit(source, unit);
     //
     // Record outputs.
     //
     outputs[CLASS_ELEMENTS] = element.types;
     outputs[COMPILATION_UNIT_ELEMENT] = element;
     outputs[RESOLVED_UNIT1] = unit;
-    outputMemento =
-        new BuildCompilationUnitElementMemento(element.types, unit, element);
   }
 
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the given
    * [target].
    */
   static Map<String, TaskInput> buildInputs(LibrarySpecificUnit target) {
     return <String, TaskInput>{
       PARSED_UNIT_INPUT_NAME: PARSED_UNIT.of(target.unit)
@@ skipping 1532 matching lines @@
    * Create a [LibraryUnitErrorsTask] based on the given [target] in the given
    * [context].
    */
   static LibraryUnitErrorsTask createTask(
       AnalysisContext context, AnalysisTarget target) {
     return new LibraryUnitErrorsTask(context, target);
   }
 }
 
 /**
- * The memento for [ParseDartTask].
- */
-class ParseDartMemento {
-  final Token inputTokenStream;
-  final List<Source> explicitlyImportedLibraries;
-  final List<Source> exportedLibraries;
-  final List<Source> importedLibraries;
-  final List<Source> includedParts;
-  final List<AnalysisError> parseErrors;
-  final CompilationUnit parsedUnit;
-  final SourceKind sourceKind;
-  final List<Source> units;
-  ParseDartMemento(this.inputTokenStream, this.explicitlyImportedLibraries,
-      this.exportedLibraries, this.importedLibraries, this.includedParts,
-      this.parseErrors, this.parsedUnit, this.sourceKind, this.units);
-}
-
-/**
  * A task that parses the content of a Dart file, producing an AST structure.
  */
 class ParseDartTask extends SourceBasedAnalysisTask {
   /**
    * The name of the input whose value is the line information produced for the
    * file.
    */
   static const String LINE_INFO_INPUT_NAME = 'LINE_INFO_INPUT_NAME';
 
   /**
@@ skipping 25 matching lines @@
 
   @override
   TaskDescriptor get descriptor => DESCRIPTOR;
 
   @override
   void internalPerform() {
     Source source = getRequiredSource();
     LineInfo lineInfo = getRequiredInput(LINE_INFO_INPUT_NAME);
     Token tokenStream = getRequiredInput(TOKEN_STREAM_INPUT_NAME);
 
-    if (inputMemento is ParseDartMemento) {
-      ParseDartMemento memento = inputMemento;
-      if (identical(memento.inputTokenStream, tokenStream)) {
-        outputMemento = memento;
-        outputs[EXPLICITLY_IMPORTED_LIBRARIES] =
-            memento.explicitlyImportedLibraries;
-        outputs[EXPORTED_LIBRARIES] = memento.exportedLibraries;
-        outputs[IMPORTED_LIBRARIES] = memento.importedLibraries;
-        outputs[INCLUDED_PARTS] = memento.includedParts;
-        outputs[PARSE_ERRORS] = memento.parseErrors;
-        outputs[PARSED_UNIT] = memento.parsedUnit;
-        outputs[SOURCE_KIND] = memento.sourceKind;
-        outputs[UNITS] = memento.units;
-        return;
-      }
-    }
-
     RecordingErrorListener errorListener = new RecordingErrorListener();
     Parser parser = new Parser(source, errorListener);
     AnalysisOptions options = context.analysisOptions;
     parser.parseFunctionBodies = options.analyzeFunctionBodiesPredicate(source);
     CompilationUnit unit = parser.parseCompilationUnit(tokenStream);
     unit.lineInfo = lineInfo;
 
     bool hasNonPartOfDirective = false;
     bool hasPartOfDirective = false;
     HashSet<Source> explicitlyImportedSourceSet = new HashSet<Source>();
@@ skipping 49 matching lines @@
     List<AnalysisError> parseErrors = errorListener.errors;
     List<Source> unitSources = <Source>[source]..addAll(includedSourceSet);
     outputs[EXPLICITLY_IMPORTED_LIBRARIES] = explicitlyImportedSources;
     outputs[EXPORTED_LIBRARIES] = exportedSources;
     outputs[IMPORTED_LIBRARIES] = importedSources;
     outputs[INCLUDED_PARTS] = includedSources;
     outputs[PARSE_ERRORS] = parseErrors;
     outputs[PARSED_UNIT] = unit;
     outputs[SOURCE_KIND] = sourceKind;
     outputs[UNITS] = unitSources;
-    outputMemento = new ParseDartMemento(tokenStream, explicitlyImportedSources,
-        exportedSources, importedSources, includedSources, parseErrors, unit,
-        sourceKind, unitSources);
   }
 
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the given
    * [source].
    */
   static Map<String, TaskInput> buildInputs(Source source) {
     return <String, TaskInput>{
       LINE_INFO_INPUT_NAME: LINE_INFO.of(source),
@@ skipping 356 matching lines @@
    * Create a [ResolveVariableReferencesTask] based on the given [target] in
    * the given [context].
    */
   static ResolveVariableReferencesTask createTask(
       AnalysisContext context, AnalysisTarget target) {
     return new ResolveVariableReferencesTask(context, target);
   }
 }
 
 /**
- * The memento for [ScanDartTask].
- */
-class ScanDartMemento {
-  final String content;
-  final Token tokenStream;
-  final LineInfo lineInfo;
-  final List<AnalysisError> errors;
-  ScanDartMemento(this.content, this.tokenStream, this.lineInfo, this.errors);
-}
-
-/**
  * A task that scans the content of a file, producing a set of Dart tokens.
  */
 class ScanDartTask extends SourceBasedAnalysisTask {
   /**
    * The name of the input whose value is the content of the file.
    */
   static const String CONTENT_INPUT_NAME = 'CONTENT_INPUT_NAME';
 
   /**
    * The task descriptor describing this kind of task.
@@ skipping 13 matching lines @@
       : super(context, target);
 
   @override
   TaskDescriptor get descriptor => DESCRIPTOR;
 
   @override
   void internalPerform() {
     Source source = getRequiredSource();
     String content = getRequiredInput(CONTENT_INPUT_NAME);
 
-    if (inputMemento is ScanDartMemento) {
-      ScanDartMemento memento = inputMemento;
-      if (memento.content == content) {
-        outputMemento = memento;
-        outputs[TOKEN_STREAM] = memento.tokenStream;
-        outputs[LINE_INFO] = memento.lineInfo;
-        outputs[SCAN_ERRORS] = memento.errors;
-        return;
-      }
-    }
-
     RecordingErrorListener errorListener = new RecordingErrorListener();
     Scanner scanner =
         new Scanner(source, new CharSequenceReader(content), errorListener);
     scanner.preserveComments = context.analysisOptions.preserveComments;
     scanner.enableNullAwareOperators =
         context.analysisOptions.enableNullAwareOperators;
 
     Token tokenStream = scanner.tokenize();
     LineInfo lineInfo = new LineInfo(scanner.lineStarts);
     List<AnalysisError> errors = errorListener.errors;
     outputs[TOKEN_STREAM] = tokenStream;
     outputs[LINE_INFO] = lineInfo;
     outputs[SCAN_ERRORS] = errors;
-    outputMemento = new ScanDartMemento(content, tokenStream, lineInfo, errors);
   }
 
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the given
    * [source].
    */
   static Map<String, TaskInput> buildInputs(Source source) {
     return <String, TaskInput>{CONTENT_INPUT_NAME: CONTENT.of(source)};
   }
@@ skipping 169 matching lines @@
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.first;
     _newSources.remove(currentTarget);
     return true;
   }
 }