| // 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.suggestion.builder; |
| |
| import 'dart:async'; |
| |
| import 'package:analysis_server/src/protocol_server.dart' as protocol; |
| import 'package:analysis_server/src/protocol_server.dart' hide Element, |
| ElementKind; |
| import 'package:analysis_server/src/services/completion/dart_completion_manager.dart'; |
| import 'package:analyzer/src/generated/ast.dart'; |
| import 'package:analyzer/src/generated/element.dart'; |
| import 'package:analyzer/src/generated/utilities_dart.dart'; |
| |
| const String DYNAMIC = 'dynamic'; |
| |
| /** |
| * Return a suggestion based upon the given element |
| * or `null` if a suggestion is not appropriate for the given element. |
| */ |
| CompletionSuggestion createSuggestion(Element element, |
| {CompletionSuggestionKind kind: CompletionSuggestionKind.INVOCATION, |
| int relevance: COMPLETION_RELEVANCE_DEFAULT}) { |
| |
| String nameForType(DartType type) { |
| if (type == null) { |
| return DYNAMIC; |
| } |
| String name = type.displayName; |
| if (name == null || name.length <= 0) { |
| return DYNAMIC; |
| } |
| //TODO (danrubel) include type arguments ?? |
| return name; |
| } |
| |
| String returnType = null; |
| if (element is ExecutableElement) { |
| if (element.isOperator) { |
| // Do not include operators in suggestions |
| return null; |
| } |
| if (element is PropertyAccessorElement && element.isSetter) { |
| // no return type |
| } else { |
| returnType = nameForType(element.returnType); |
| } |
| } else if (element is VariableElement) { |
| returnType = nameForType(element.type); |
| } else if (element is FunctionTypeAliasElement) { |
| returnType = nameForType(element.returnType); |
| } |
| |
| String completion = element.displayName; |
| bool isDeprecated = element.isDeprecated; |
| CompletionSuggestion suggestion = new CompletionSuggestion( |
| kind, |
| isDeprecated ? COMPLETION_RELEVANCE_LOW : relevance, |
| completion, |
| completion.length, |
| 0, |
| isDeprecated, |
| false); |
| suggestion.element = protocol.newElement_fromEngine(element); |
| if (element is ClassMemberElement) { |
| ClassElement enclosingElement = element.enclosingElement; |
| if (enclosingElement != null) { |
| suggestion.declaringType = enclosingElement.displayName; |
| } |
| } |
| suggestion.returnType = returnType; |
| if (element is ExecutableElement && element is! PropertyAccessorElement) { |
| suggestion.parameterNames = element.parameters.map( |
| (ParameterElement parameter) => parameter.name).toList(); |
| suggestion.parameterTypes = element.parameters.map( |
| (ParameterElement parameter) => parameter.type.displayName).toList(); |
| suggestion.requiredParameterCount = element.parameters.where( |
| (ParameterElement parameter) => |
| parameter.parameterKind == ParameterKind.REQUIRED).length; |
| suggestion.hasNamedParameters = element.parameters.any( |
| (ParameterElement parameter) => parameter.parameterKind == ParameterKind.NAMED); |
| } |
| return suggestion; |
| } |
| |
| /** |
| * Call the given function with each non-null non-empty inherited type name |
| * that is defined in the given class. |
| */ |
| visitInheritedTypeNames(ClassDeclaration node, void inherited(String name)) { |
| |
| void visit(TypeName type) { |
| if (type != null) { |
| Identifier id = type.name; |
| if (id != null) { |
| String name = id.name; |
| if (name != null && name.length > 0) { |
| inherited(name); |
| } |
| } |
| } |
| } |
| |
| ExtendsClause extendsClause = node.extendsClause; |
| if (extendsClause != null) { |
| visit(extendsClause.superclass); |
| } |
| ImplementsClause implementsClause = node.implementsClause; |
| if (implementsClause != null) { |
| NodeList<TypeName> interfaces = implementsClause.interfaces; |
| if (interfaces != null) { |
| interfaces.forEach((TypeName type) { |
| visit(type); |
| }); |
| } |
| } |
| WithClause withClause = node.withClause; |
| if (withClause != null) { |
| NodeList<TypeName> mixinTypes = withClause.mixinTypes; |
| if (mixinTypes != null) { |
| mixinTypes.forEach((TypeName type) { |
| visit(type); |
| }); |
| } |
| } |
| } |
| |
| /** |
| * Starting with the given class node, traverse the inheritence hierarchy |
| * calling the given functions with each non-null non-empty inherited class |
| * declaration. For each locally defined class declaration, call [local]. |
| * For each class identifier in the hierarchy that is not defined locally, |
| * call the [imported] function. |
| */ |
| void visitInheritedTypes(ClassDeclaration node, void |
| local(ClassDeclaration classNode), void imported(String typeName)) { |
| CompilationUnit unit = node.getAncestor((p) => p is CompilationUnit); |
| List<ClassDeclaration> todo = new List<ClassDeclaration>(); |
| todo.add(node); |
| Set<String> visited = new Set<String>(); |
| while (todo.length > 0) { |
| node = todo.removeLast(); |
| visitInheritedTypeNames(node, (String name) { |
| if (visited.add(name)) { |
| var classNode = unit.declarations.firstWhere((member) { |
| if (member is ClassDeclaration) { |
| SimpleIdentifier id = member.name; |
| if (id != null && id.name == name) { |
| return true; |
| } |
| } |
| return false; |
| }, orElse: () => null); |
| if (classNode is ClassDeclaration) { |
| local(classNode); |
| todo.add(classNode); |
| } else { |
| imported(name); |
| } |
| } |
| }); |
| } |
| } |
| |
| /** |
| * This class visits elements in a class and provides suggestions based upon |
| * the visible members in that class. Clients should call |
| * [ClassElementSuggestionBuilder.suggestionsFor]. |
| */ |
| class ClassElementSuggestionBuilder extends GeneralizingElementVisitor with |
| ElementSuggestionBuilder { |
| final bool staticOnly; |
| final DartCompletionRequest request; |
| |
| ClassElementSuggestionBuilder(this.request, bool staticOnly) |
| : this.staticOnly = staticOnly; |
| |
| @override |
| CompletionSuggestionKind get kind => CompletionSuggestionKind.INVOCATION; |
| |
| @override |
| visitClassElement(ClassElement element) { |
| element.visitChildren(this); |
| element.allSupertypes.forEach((InterfaceType type) { |
| type.element.visitChildren(this); |
| }); |
| } |
| |
| @override |
| visitElement(Element element) { |
| // ignored |
| } |
| |
| @override |
| visitFieldElement(FieldElement element) { |
| if (staticOnly && !element.isStatic) { |
| return; |
| } |
| addSuggestion(element); |
| } |
| |
| @override |
| visitMethodElement(MethodElement element) { |
| if (staticOnly && !element.isStatic) { |
| return; |
| } |
| if (element.isOperator) { |
| return; |
| } |
| addSuggestion(element); |
| } |
| |
| @override |
| visitPropertyAccessorElement(PropertyAccessorElement element) { |
| if (staticOnly && !element.isStatic) { |
| return; |
| } |
| addSuggestion(element); |
| } |
| |
| /** |
| * Add suggestions for the visible members in the given class |
| */ |
| static void suggestionsFor(DartCompletionRequest request, Element element, |
| {bool staticOnly: false}) { |
| if (element == DynamicElementImpl.instance) { |
| element = request.cache.objectClassElement; |
| } |
| if (element is ClassElement) { |
| return element.accept( |
| new ClassElementSuggestionBuilder(request, staticOnly)); |
| } |
| } |
| } |
| |
| /** |
| * Common mixin for sharing behavior |
| */ |
| abstract class ElementSuggestionBuilder { |
| |
| /** |
| * Internal collection of completions to prevent duplicate completions. |
| */ |
| final Set<String> _completions = new Set<String>(); |
| |
| /** |
| * Return the kind of suggestions that should be built. |
| */ |
| CompletionSuggestionKind get kind; |
| |
| /** |
| * Return the request on which the builder is operating. |
| */ |
| DartCompletionRequest get request; |
| |
| /** |
| * Add a suggestion based upon the given element. |
| */ |
| void addSuggestion(Element element) { |
| if (element.isPrivate) { |
| LibraryElement elementLibrary = element.library; |
| LibraryElement unitLibrary = request.unit.element.library; |
| if (elementLibrary != unitLibrary) { |
| return; |
| } |
| } |
| if (element.isSynthetic) { |
| if (element is PropertyAccessorElement || element is FieldElement) { |
| return; |
| } |
| } |
| String completion = element.displayName; |
| if (completion == null || |
| completion.length <= 0 || |
| !_completions.add(completion)) { |
| return; |
| } |
| CompletionSuggestion suggestion = createSuggestion(element, kind: kind); |
| if (suggestion != null) { |
| request.suggestions.add(suggestion); |
| } |
| } |
| } |
| |
| /** |
| * This class visits elements in a library and provides suggestions based upon |
| * the visible members in that library. Clients should call |
| * [LibraryElementSuggestionBuilder.suggestionsFor]. |
| */ |
| class LibraryElementSuggestionBuilder extends GeneralizingElementVisitor with |
| ElementSuggestionBuilder { |
| final DartCompletionRequest request; |
| final CompletionSuggestionKind kind; |
| |
| LibraryElementSuggestionBuilder(this.request, this.kind); |
| |
| @override |
| visitClassElement(ClassElement element) { |
| addSuggestion(element); |
| } |
| |
| @override |
| visitCompilationUnitElement(CompilationUnitElement element) { |
| element.visitChildren(this); |
| } |
| |
| @override |
| visitElement(Element element) { |
| // ignored |
| } |
| |
| @override |
| visitFunctionElement(FunctionElement element) { |
| addSuggestion(element); |
| } |
| |
| @override |
| visitFunctionTypeAliasElement(FunctionTypeAliasElement element) { |
| addSuggestion(element); |
| } |
| |
| @override |
| visitTopLevelVariableElement(TopLevelVariableElement element) { |
| addSuggestion(element); |
| } |
| |
| /** |
| * Add suggestions for the visible members in the given library |
| */ |
| static void suggestionsFor(DartCompletionRequest request, |
| CompletionSuggestionKind kind, LibraryElement library) { |
| if (library != null) { |
| library.visitChildren(new LibraryElementSuggestionBuilder(request, kind)); |
| } |
| } |
| } |
| |
| /** |
| * This class visits elements in a class and provides suggestions based upon |
| * the visible named constructors in that class. |
| */ |
| class NamedConstructorSuggestionBuilder extends GeneralizingElementVisitor with |
| ElementSuggestionBuilder implements SuggestionBuilder { |
| final DartCompletionRequest request; |
| |
| NamedConstructorSuggestionBuilder(this.request); |
| |
| @override |
| CompletionSuggestionKind get kind => CompletionSuggestionKind.INVOCATION; |
| |
| @override |
| bool computeFast(AstNode node) { |
| return false; |
| } |
| |
| @override |
| Future<bool> computeFull(AstNode node) { |
| if (node is SimpleIdentifier) { |
| node = node.parent; |
| } |
| if (node is ConstructorName) { |
| TypeName typeName = node.type; |
| if (typeName != null) { |
| DartType type = typeName.type; |
| if (type != null) { |
| if (type.element is ClassElement) { |
| type.element.accept(this); |
| } |
| return new Future.value(true); |
| } |
| } |
| } |
| return new Future.value(false); |
| } |
| |
| @override |
| visitClassElement(ClassElement element) { |
| element.visitChildren(this); |
| } |
| |
| @override |
| visitConstructorElement(ConstructorElement element) { |
| addSuggestion(element); |
| } |
| |
| @override |
| visitElement(Element element) { |
| // ignored |
| } |
| } |
| |
| /** |
| * Common interface implemented by suggestion builders. |
| */ |
| abstract class SuggestionBuilder { |
| /** |
| * Compute suggestions and return `true` if building is complete, |
| * or `false` if [computeFull] should be called. |
| */ |
| bool computeFast(AstNode node); |
| |
| /** |
| * Return a future that computes the suggestions given a fully resolved AST. |
| * The future returns `true` if suggestions were added, else `false`. |
| */ |
| Future<bool> computeFull(AstNode node); |
| } |