pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart - sdk.git - Git at Google

 // 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 services.completion.dart.cache;

 import 'dart:async';
 import 'dart:collection';

 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/suggestion_builder.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';

 /**
  * The `DartCompletionCache` contains cached information from a prior code
  * completion operation.
  */
 class DartCompletionCache extends CompletionCache {
   /**
    * A hash of the import directives
    * or `null` if nothing has been cached.
    */
   String _importKey;

   /**
    * Type suggestions based upon imports,
    * or `null` if nothing has been cached.
    */
   List<CompletionSuggestion> importedTypeSuggestions;

   /**
    * Suggestions for methods and functions that have void return type,
    * or `null` if nothing has been cached.
    */
   List<CompletionSuggestion> importedVoidReturnSuggestions;

   /**
    * Other suggestions based upon imports,
    * or `null` if nothing has been cached.
    */
   List<CompletionSuggestion> otherImportedSuggestions;

   /**
    * Suggestions for constructors
    * or `null` if nothing has been cached.
    */
   List<CompletionSuggestion> importedConstructorSuggestions;

   /**
    * A collection of all imported completions
    * or `null` if nothing has been cached.
    */
   HashSet<String> _importedCompletions;

   /**
    * A map of simple identifier to imported class element
    * or `null` if nothing has been cached.
    */
   Map<String, ClassElement> importedClassMap;

   /**
    * The [ClassElement] for Object.
    */
   ClassElement _objectClassElement;

   DartCompletionCache(AnalysisContext context, Source source)
       : super(context, source);

   /**
    * Return a hash of the import directives for the cached import info
    * or `null` if nothing has been cached.
    */
   String get importKey => _importKey;

   /**
    * Return the [ClassElement] for Object.
    */
   ClassElement get objectClassElement {
     if (_objectClassElement == null) {
       Source coreUri = context.sourceFactory.forUri('dart:core');
       LibraryElement coreLib = context.getLibraryElement(coreUri);
       _objectClassElement = coreLib.getType('Object');
     }
     return _objectClassElement;
   }

   /**
    * Given a resolved compilation unit, compute suggestions based upon the
    * imports and other dart files (e.g. "part" files) in the library containing
    * the given compilation unit. The returned future completes when the cache
    * is populated.
    *
    * If [shouldWaitForLowPrioritySuggestions] is `true` then the returned
    * future will complete when the cache is fully populated. If `false`,
    * the returned future will complete sooner, but the cache will not include
    * the lower priority suggestions added as a result of a global search.
    * In this case, those lower priority suggestions will be added later
    * when the index has been updated and the global search completes.
    */
   Future<bool> computeImportInfo(CompilationUnit unit,
       SearchEngine searchEngine, bool shouldWaitForLowPrioritySuggestions) {
     importedTypeSuggestions = <CompletionSuggestion>[];
     otherImportedSuggestions = <CompletionSuggestion>[];
     importedConstructorSuggestions = <CompletionSuggestion>[];
     importedVoidReturnSuggestions = <CompletionSuggestion>[];
     importedClassMap = new Map<String, ClassElement>();
     _importedCompletions = new HashSet<String>();

     // Assert that the compilation unit is resolved
     // and represents the expected source
     assert(unit.element.source == source);

     // Exclude elements from local library
     // because they are provided by LocalReferenceContributor
     Set<LibraryElement> excludedLibs = new Set<LibraryElement>();
     excludedLibs.add(unit.element.enclosingElement);

     // Determine the compilation unit defining the library containing
     // this compilation unit
     List<Source> libraries = context.getLibrariesContaining(source);
     assert(libraries != null);
     Source libSource = libraries.length > 0 ? libraries[0] : null;
     Future<CompilationUnit> futureLibUnit = _computeLibUnit(libSource, unit);

     // Include implicitly imported dart:core elements
     _addDartCoreSuggestions();

     // Include explicitly imported and part elements
     Future futureImportsCached = futureLibUnit.then((CompilationUnit libUnit) {
       _addImportedElemSuggestions(libSource, libUnit, excludedLibs);
       // Don't wait for search of lower relevance results to complete.
       // Set key indicating results are ready, and lower relevance results
       // will be added to the cache when the search completes.
       _importKey = _computeImportKey(unit);
       return true;
     });

     // Add non-imported elements as low relevance
     // after the imported element suggestions have been added
     Future<bool> futureAllCached = futureImportsCached.then((_) {
       return searchEngine
           .searchTopLevelDeclarations('')
           .then((List<SearchMatch> matches) {
         _addNonImportedElementSuggestions(matches, excludedLibs);
         return true;
       });
     });

     return shouldWaitForLowPrioritySuggestions
         ? futureAllCached
         : futureImportsCached;
   }

   /**
    * Return `true` if the import information is cached for the given
    * compilation unit.
    */
   bool isImportInfoCached(CompilationUnit unit) =>
       _importKey != null && _importKey == _computeImportKey(unit);

   /**
    * Add constructor suggestions for the given class.
    */
   void _addConstructorSuggestions(
       ClassElement classElem, int relevance, Source importForSource) {
     String className = classElem.name;
     for (ConstructorElement constructor in classElem.constructors) {
       if (!constructor.isPrivate) {
         CompletionSuggestion suggestion = createSuggestion(constructor,
             relevance: relevance, importForSource: importForSource);
         if (suggestion != null) {
           String name = suggestion.completion;
           name = name.length > 0 ? '$className.$name' : className;
           suggestion.completion = name;
           suggestion.selectionOffset = suggestion.completion.length;
           importedConstructorSuggestions.add(suggestion);
         }
       }
     }
   }

   /**
    * Add suggestions for implicitly imported elements in dart:core.
    */
   void _addDartCoreSuggestions() {
     Source coreUri = context.sourceFactory.forUri('dart:core');
     LibraryElement coreLib = context.getLibraryElement(coreUri);
     if (coreLib == null) {
       // If the core library has not been analyzed yet, then we cannot add any
       // suggestions from it.
       return;
     }
     Namespace coreNamespace =
         new NamespaceBuilder().createPublicNamespaceForLibrary(coreLib);
     coreNamespace.definedNames.forEach((String name, Element elem) {
       if (elem is ClassElement) {
         importedClassMap[name] = elem;
       }
       _addSuggestion(elem, DART_RELEVANCE_DEFAULT);
     });
   }

   /**
    * Add suggestions for explicitly imported and part elements in the given
    * library. Add libraries that should not have their elements suggested
    * even as low priority to [excludedLibs].
    */
   void _addImportedElemSuggestions(Source libSource, CompilationUnit libUnit,
       Set<LibraryElement> excludedLibs) {
     if (libUnit != null) {
       libUnit.directives.forEach((Directive directive) {
         if (directive is ImportDirective) {
           ImportElement importElem = directive.element;
           if (importElem != null && importElem.importedLibrary != null) {
             if (directive.prefix == null) {
               Namespace importNamespace = new NamespaceBuilder()
                   .createImportNamespaceForDirective(importElem);
               // Include top level elements
               importNamespace.definedNames.forEach((String name, Element elem) {
                 if (elem is ClassElement) {
                   importedClassMap[name] = elem;
                 }
                 _addSuggestion(elem, DART_RELEVANCE_DEFAULT);
               });
             } else {
               // Exclude elements from prefixed imports
               // because they are provided by PrefixedElementContributor
               // Suggested by LibraryPrefixContributor
               // _addLibraryPrefixSuggestion(importElem);
               // excludedLibs.add(importElem.importedLibrary);
             }
           }
         } else if (directive is PartDirective) {
           CompilationUnitElement partElem = directive.element;
           if (partElem != null && partElem.source != source) {
             partElem.accept(new _NonLocalElementCacheVisitor(this));
           }
         }
       });
       if (libSource != source) {
         libUnit.element.accept(new _NonLocalElementCacheVisitor(this));
       }
     }
   }

   /**
    * Add suggestions for all top level elements in the context
    * excluding those elemnents for which suggestions have already been added.
    */
   void _addNonImportedElementSuggestions(
       List<SearchMatch> matches, Set<LibraryElement> excludedLibs) {
     // Exclude internal Dart SDK libraries
     for (var lib in context.sourceFactory.dartSdk.sdkLibraries) {
       if (lib.isInternal) {
         Source libUri = context.sourceFactory.forUri(lib.shortName);
         if (libUri != null) {
           LibraryElement libElem = context.getLibraryElement(libUri);
           if (libElem != null) {
             excludedLibs.add(libElem);
           }
         }
       }
     }

     AnalysisContext sdkContext = context.sourceFactory.dartSdk.context;
     matches.forEach((SearchMatch match) {
       if (match.kind == MatchKind.DECLARATION) {
         Element element = match.element;
         if ((element.context == context || element.context == sdkContext) &&
             element.isPublic &&
             !excludedLibs.contains(element.library) &&
             !_importedCompletions.contains(element.displayName)) {
           _addSuggestion(element, DART_RELEVANCE_LOW, importForSource: source);
         }
       }
     });
   }

   /**
    * Add a suggestion for the given element.
    */
   void _addSuggestion(Element element, int relevance,
       {Source importForSource}) {
     if (element is ExecutableElement) {
       // Do not suggest operators or local functions
       if (element.isOperator) {
         return;
       }
       if (element is FunctionElement) {
         if (element.enclosingElement is! CompilationUnitElement) {
           return;
         }
       }
     }

     CompletionSuggestion suggestion = createSuggestion(element,
         relevance: relevance, importForSource: importForSource);

     if (suggestion != null) {
       if (element is ExecutableElement) {
         DartType returnType = element.returnType;
         if (returnType != null && returnType.isVoid) {
           importedVoidReturnSuggestions.add(suggestion);
         } else {
           otherImportedSuggestions.add(suggestion);
         }
       } else if (element is FunctionTypeAliasElement) {
         importedTypeSuggestions.add(suggestion);
       } else if (element is ClassElement) {
         importedTypeSuggestions.add(suggestion);
         _addConstructorSuggestions(element, relevance, importForSource);
       } else {
         otherImportedSuggestions.add(suggestion);
       }
       _importedCompletions.add(suggestion.completion);
     }
   }

   /**
    * Compute the hash of the imports for the given compilation unit.
    */
   String _computeImportKey(CompilationUnit unit) {
     StringBuffer sb = new StringBuffer();
     unit.directives.forEach((Directive directive) {
       sb.write(directive.toSource());
     });
     return sb.toString();
   }

   /**
    * Compute the library unit for the given library source,
    * where the [unit] is the resolved compilation unit associated with [source].
    */
   Future<CompilationUnit> _computeLibUnit(
       Source libSource, CompilationUnit unit) {
     // If the sources are the same then we already have the library unit
     if (libSource == source) {
       return new Future.value(unit);
     }
     // If [source] is a part, then compute the library unit
     if (libSource != null) {
       return context.computeResolvedCompilationUnitAsync(libSource, libSource);
     }
     return new Future.value(null);
   }
 }

 /**
  * A visitor for building suggestions based upon the elements defined by
  * a source file contained in the same library but not the same as
  * the source in which the completions are being requested.
  */
 class _NonLocalElementCacheVisitor extends GeneralizingElementVisitor {
   final DartCompletionCache cache;

   _NonLocalElementCacheVisitor(this.cache);

   @override
   void visitClassElement(ClassElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }

   @override
   void visitCompilationUnitElement(CompilationUnitElement element) {
     element.visitChildren(this);
   }

   @override
   void visitElement(Element element) {
     // ignored
   }

   @override
   void visitFunctionElement(FunctionElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }

   @override
   void visitFunctionTypeAliasElement(FunctionTypeAliasElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }

   @override
   void visitTopLevelVariableElement(TopLevelVariableElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }
 }
	// 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 services.completion.dart.cache;

	import 'dart:async';
	import 'dart:collection';

	import 'package:analysis_server/src/protocol_server.dart'
	hide Element, ElementKind;
	import 'package:analysis_server/src/services/completion/completion_manager.dart';
	import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
	import 'package:analysis_server/src/services/completion/suggestion_builder.dart';
	import 'package:analysis_server/src/services/search/search_engine.dart';
	import 'package:analyzer/src/generated/ast.dart';
	import 'package:analyzer/src/generated/element.dart';
	import 'package:analyzer/src/generated/engine.dart';
	import 'package:analyzer/src/generated/resolver.dart';
	import 'package:analyzer/src/generated/source.dart';

	/**
	* The `DartCompletionCache` contains cached information from a prior code
	* completion operation.
	*/
	class DartCompletionCache extends CompletionCache {
	/**
	* A hash of the import directives
	* or `null` if nothing has been cached.
	*/
	String _importKey;

	/**
	* Type suggestions based upon imports,
	* or `null` if nothing has been cached.
	*/
	List<CompletionSuggestion> importedTypeSuggestions;

	/**
	* Suggestions for methods and functions that have void return type,
	* or `null` if nothing has been cached.
	*/
	List<CompletionSuggestion> importedVoidReturnSuggestions;

	/**
	* Other suggestions based upon imports,
	* or `null` if nothing has been cached.
	*/
	List<CompletionSuggestion> otherImportedSuggestions;

	/**
	* Suggestions for constructors
	* or `null` if nothing has been cached.
	*/
	List<CompletionSuggestion> importedConstructorSuggestions;

	/**
	* A collection of all imported completions
	* or `null` if nothing has been cached.
	*/
	HashSet<String> _importedCompletions;

	/**
	* A map of simple identifier to imported class element
	* or `null` if nothing has been cached.
	*/
	Map<String, ClassElement> importedClassMap;

	/**
	* The [ClassElement] for Object.
	*/
	ClassElement _objectClassElement;

	DartCompletionCache(AnalysisContext context, Source source)
	: super(context, source);

	/**
	* Return a hash of the import directives for the cached import info
	* or `null` if nothing has been cached.
	*/
	String get importKey => _importKey;

	/**
	* Return the [ClassElement] for Object.
	*/
	ClassElement get objectClassElement {
	if (_objectClassElement == null) {
	Source coreUri = context.sourceFactory.forUri('dart:core');
	LibraryElement coreLib = context.getLibraryElement(coreUri);
	_objectClassElement = coreLib.getType('Object');
	}
	return _objectClassElement;
	}

	/**
	* Given a resolved compilation unit, compute suggestions based upon the
	* imports and other dart files (e.g. "part" files) in the library containing
	* the given compilation unit. The returned future completes when the cache
	* is populated.
	*
	* If [shouldWaitForLowPrioritySuggestions] is `true` then the returned
	* future will complete when the cache is fully populated. If `false`,
	* the returned future will complete sooner, but the cache will not include
	* the lower priority suggestions added as a result of a global search.
	* In this case, those lower priority suggestions will be added later
	* when the index has been updated and the global search completes.
	*/
	Future<bool> computeImportInfo(CompilationUnit unit,
	SearchEngine searchEngine, bool shouldWaitForLowPrioritySuggestions) {
	importedTypeSuggestions = <CompletionSuggestion>[];
	otherImportedSuggestions = <CompletionSuggestion>[];
	importedConstructorSuggestions = <CompletionSuggestion>[];
	importedVoidReturnSuggestions = <CompletionSuggestion>[];
	importedClassMap = new Map<String, ClassElement>();
	_importedCompletions = new HashSet<String>();

	// Assert that the compilation unit is resolved
	// and represents the expected source
	assert(unit.element.source == source);

	// Exclude elements from local library
	// because they are provided by LocalReferenceContributor
	Set<LibraryElement> excludedLibs = new Set<LibraryElement>();
	excludedLibs.add(unit.element.enclosingElement);

	// Determine the compilation unit defining the library containing
	// this compilation unit
	List<Source> libraries = context.getLibrariesContaining(source);
	assert(libraries != null);
	Source libSource = libraries.length > 0 ? libraries[0] : null;
	Future<CompilationUnit> futureLibUnit = _computeLibUnit(libSource, unit);

	// Include implicitly imported dart:core elements
	_addDartCoreSuggestions();

	// Include explicitly imported and part elements
	Future futureImportsCached = futureLibUnit.then((CompilationUnit libUnit) {
	_addImportedElemSuggestions(libSource, libUnit, excludedLibs);
	// Don't wait for search of lower relevance results to complete.
	// Set key indicating results are ready, and lower relevance results
	// will be added to the cache when the search completes.
	_importKey = _computeImportKey(unit);
	return true;
	});

	// Add non-imported elements as low relevance
	// after the imported element suggestions have been added
	Future<bool> futureAllCached = futureImportsCached.then((_) {
	return searchEngine
	.searchTopLevelDeclarations('')
	.then((List<SearchMatch> matches) {
	_addNonImportedElementSuggestions(matches, excludedLibs);
	return true;
	});
	});

	return shouldWaitForLowPrioritySuggestions
	? futureAllCached
	: futureImportsCached;
	}

	/**
	* Return `true` if the import information is cached for the given
	* compilation unit.
	*/
	bool isImportInfoCached(CompilationUnit unit) =>
	_importKey != null && _importKey == _computeImportKey(unit);

	/**
	* Add constructor suggestions for the given class.
	*/
	void _addConstructorSuggestions(
	ClassElement classElem, int relevance, Source importForSource) {
	String className = classElem.name;
	for (ConstructorElement constructor in classElem.constructors) {
	if (!constructor.isPrivate) {
	CompletionSuggestion suggestion = createSuggestion(constructor,
	relevance: relevance, importForSource: importForSource);
	if (suggestion != null) {
	String name = suggestion.completion;
	name = name.length > 0 ? '$className.$name' : className;
	suggestion.completion = name;
	suggestion.selectionOffset = suggestion.completion.length;
	importedConstructorSuggestions.add(suggestion);
	}
	}
	}
	}

	/**
	* Add suggestions for implicitly imported elements in dart:core.
	*/
	void _addDartCoreSuggestions() {
	Source coreUri = context.sourceFactory.forUri('dart:core');
	LibraryElement coreLib = context.getLibraryElement(coreUri);
	if (coreLib == null) {
	// If the core library has not been analyzed yet, then we cannot add any
	// suggestions from it.
	return;
	}
	Namespace coreNamespace =
	new NamespaceBuilder().createPublicNamespaceForLibrary(coreLib);
	coreNamespace.definedNames.forEach((String name, Element elem) {
	if (elem is ClassElement) {
	importedClassMap[name] = elem;
	}
	_addSuggestion(elem, DART_RELEVANCE_DEFAULT);
	});
	}

	/**
	* Add suggestions for explicitly imported and part elements in the given
	* library. Add libraries that should not have their elements suggested
	* even as low priority to [excludedLibs].
	*/
	void _addImportedElemSuggestions(Source libSource, CompilationUnit libUnit,
	Set<LibraryElement> excludedLibs) {
	if (libUnit != null) {
	libUnit.directives.forEach((Directive directive) {
	if (directive is ImportDirective) {
	ImportElement importElem = directive.element;
	if (importElem != null && importElem.importedLibrary != null) {
	if (directive.prefix == null) {
	Namespace importNamespace = new NamespaceBuilder()
	.createImportNamespaceForDirective(importElem);
	// Include top level elements
	importNamespace.definedNames.forEach((String name, Element elem) {
	if (elem is ClassElement) {
	importedClassMap[name] = elem;
	}
	_addSuggestion(elem, DART_RELEVANCE_DEFAULT);
	});
	} else {
	// Exclude elements from prefixed imports
	// because they are provided by PrefixedElementContributor
	// Suggested by LibraryPrefixContributor
	// _addLibraryPrefixSuggestion(importElem);
	// excludedLibs.add(importElem.importedLibrary);
	}
	}
	} else if (directive is PartDirective) {
	CompilationUnitElement partElem = directive.element;
	if (partElem != null && partElem.source != source) {
	partElem.accept(new _NonLocalElementCacheVisitor(this));
	}
	}
	});
	if (libSource != source) {
	libUnit.element.accept(new _NonLocalElementCacheVisitor(this));
	}
	}
	}

	/**
	* Add suggestions for all top level elements in the context
	* excluding those elemnents for which suggestions have already been added.
	*/
	void _addNonImportedElementSuggestions(
	List<SearchMatch> matches, Set<LibraryElement> excludedLibs) {
	// Exclude internal Dart SDK libraries
	for (var lib in context.sourceFactory.dartSdk.sdkLibraries) {
	if (lib.isInternal) {
	Source libUri = context.sourceFactory.forUri(lib.shortName);
	if (libUri != null) {
	LibraryElement libElem = context.getLibraryElement(libUri);
	if (libElem != null) {
	excludedLibs.add(libElem);
	}
	}
	}
	}

	AnalysisContext sdkContext = context.sourceFactory.dartSdk.context;
	matches.forEach((SearchMatch match) {
	if (match.kind == MatchKind.DECLARATION) {
	Element element = match.element;
	if ((element.context == context \|\| element.context == sdkContext) &&
	element.isPublic &&
	!excludedLibs.contains(element.library) &&
	!_importedCompletions.contains(element.displayName)) {
	_addSuggestion(element, DART_RELEVANCE_LOW, importForSource: source);
	}
	}
	});
	}

	/**
	* Add a suggestion for the given element.
	*/
	void _addSuggestion(Element element, int relevance,
	{Source importForSource}) {
	if (element is ExecutableElement) {
	// Do not suggest operators or local functions
	if (element.isOperator) {
	return;
	}
	if (element is FunctionElement) {
	if (element.enclosingElement is! CompilationUnitElement) {
	return;
	}
	}
	}

	CompletionSuggestion suggestion = createSuggestion(element,
	relevance: relevance, importForSource: importForSource);

	if (suggestion != null) {
	if (element is ExecutableElement) {
	DartType returnType = element.returnType;
	if (returnType != null && returnType.isVoid) {
	importedVoidReturnSuggestions.add(suggestion);
	} else {
	otherImportedSuggestions.add(suggestion);
	}
	} else if (element is FunctionTypeAliasElement) {
	importedTypeSuggestions.add(suggestion);
	} else if (element is ClassElement) {
	importedTypeSuggestions.add(suggestion);
	_addConstructorSuggestions(element, relevance, importForSource);
	} else {
	otherImportedSuggestions.add(suggestion);
	}
	_importedCompletions.add(suggestion.completion);
	}
	}

	/**
	* Compute the hash of the imports for the given compilation unit.
	*/
	String _computeImportKey(CompilationUnit unit) {
	StringBuffer sb = new StringBuffer();
	unit.directives.forEach((Directive directive) {
	sb.write(directive.toSource());
	});
	return sb.toString();
	}

	/**
	* Compute the library unit for the given library source,
	* where the [unit] is the resolved compilation unit associated with [source].
	*/
	Future<CompilationUnit> _computeLibUnit(
	Source libSource, CompilationUnit unit) {
	// If the sources are the same then we already have the library unit
	if (libSource == source) {
	return new Future.value(unit);
	}
	// If [source] is a part, then compute the library unit
	if (libSource != null) {
	return context.computeResolvedCompilationUnitAsync(libSource, libSource);
	}
	return new Future.value(null);
	}
	}

	/**
	* A visitor for building suggestions based upon the elements defined by
	* a source file contained in the same library but not the same as
	* the source in which the completions are being requested.
	*/
	class _NonLocalElementCacheVisitor extends GeneralizingElementVisitor {
	final DartCompletionCache cache;

	_NonLocalElementCacheVisitor(this.cache);

	@override
	void visitClassElement(ClassElement element) {
	cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
	}

	@override
	void visitCompilationUnitElement(CompilationUnitElement element) {
	element.visitChildren(this);
	}

	@override
	void visitElement(Element element) {
	// ignored
	}

	@override
	void visitFunctionElement(FunctionElement element) {
	cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
	}

	@override
	void visitFunctionTypeAliasElement(FunctionTypeAliasElement element) {
	cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
	}

	@override
	void visitTopLevelVariableElement(TopLevelVariableElement element) {
	cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
	}
	}