| // 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.search.element_visitors; |
| |
| import 'package:analyzer/src/generated/element.dart'; |
| |
| |
| /** |
| * Uses [processor] to visit all of the children of [element]. |
| * If [processor] returns `true`, then children of a child are visited too. |
| */ |
| void visitChildren(Element element, ElementProcessor processor) { |
| element.visitChildren(new _ElementVisitorAdapter(processor)); |
| } |
| |
| |
| /** |
| * Uses [processor] to visit all of the top-level elements of [library]. |
| */ |
| void visitLibraryTopLevelElements(LibraryElement library, |
| ElementProcessor processor) { |
| library.visitChildren(new _TopLevelElementsVisitor(processor)); |
| } |
| |
| |
| /** |
| * An [Element] processor function type. |
| * If `true` is returned, children of [element] will be visited. |
| */ |
| typedef bool ElementProcessor(Element element); |
| |
| |
| /** |
| * A [GeneralizingElementVisitor] adapter for [ElementProcessor]. |
| */ |
| class _ElementVisitorAdapter extends GeneralizingElementVisitor { |
| final ElementProcessor processor; |
| |
| _ElementVisitorAdapter(this.processor); |
| |
| @override |
| void visitElement(Element element) { |
| bool visitChildren = processor(element); |
| if (visitChildren == true) { |
| element.visitChildren(this); |
| } |
| } |
| } |
| |
| |
| /** |
| * A [GeneralizingElementVisitor] for visiting top-level elements. |
| */ |
| class _TopLevelElementsVisitor extends GeneralizingElementVisitor { |
| final ElementProcessor processor; |
| |
| _TopLevelElementsVisitor(this.processor); |
| |
| @override |
| void visitElement(Element element) { |
| if (element is CompilationUnitElement) { |
| element.visitChildren(this); |
| } else { |
| processor(element); |
| } |
| } |
| } |