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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 library services.search.element_visitors; | 5 library services.search.element_visitors; |
| 6 | 6 |
| 7 import 'package:analyzer/src/generated/element.dart'; | 7 import 'package:analyzer/src/generated/element.dart'; |
| 8 | 8 |
| 9 | |
| 10 /** | 9 /** |
| 11 * Uses [processor] to visit all of the children of [element]. | 10 * Uses [processor] to visit all of the children of [element]. |
| 12 * If [processor] returns `true`, then children of a child are visited too. | 11 * If [processor] returns `true`, then children of a child are visited too. |
| 13 */ | 12 */ |
| 14 void visitChildren(Element element, ElementProcessor processor) { | 13 void visitChildren(Element element, ElementProcessor processor) { |
| 15 element.visitChildren(new _ElementVisitorAdapter(processor)); | 14 element.visitChildren(new _ElementVisitorAdapter(processor)); |
| 16 } | 15 } |
| 17 | 16 |
| 18 | |
| 19 /** | 17 /** |
| 20 * Uses [processor] to visit all of the top-level elements of [library]. | 18 * Uses [processor] to visit all of the top-level elements of [library]. |
| 21 */ | 19 */ |
| 22 void visitLibraryTopLevelElements(LibraryElement library, | 20 void visitLibraryTopLevelElements( |
| 23 ElementProcessor processor) { | 21 LibraryElement library, ElementProcessor processor) { |
| 24 library.visitChildren(new _TopLevelElementsVisitor(processor)); | 22 library.visitChildren(new _TopLevelElementsVisitor(processor)); |
| 25 } | 23 } |
| 26 | 24 |
| 27 | |
| 28 /** | 25 /** |
| 29 * An [Element] processor function type. | 26 * An [Element] processor function type. |
| 30 * If `true` is returned, children of [element] will be visited. | 27 * If `true` is returned, children of [element] will be visited. |
| 31 */ | 28 */ |
| 32 typedef bool ElementProcessor(Element element); | 29 typedef bool ElementProcessor(Element element); |
| 33 | 30 |
| 34 | |
| 35 /** | 31 /** |
| 36 * A [GeneralizingElementVisitor] adapter for [ElementProcessor]. | 32 * A [GeneralizingElementVisitor] adapter for [ElementProcessor]. |
| 37 */ | 33 */ |
| 38 class _ElementVisitorAdapter extends GeneralizingElementVisitor { | 34 class _ElementVisitorAdapter extends GeneralizingElementVisitor { |
| 39 final ElementProcessor processor; | 35 final ElementProcessor processor; |
| 40 | 36 |
| 41 _ElementVisitorAdapter(this.processor); | 37 _ElementVisitorAdapter(this.processor); |
| 42 | 38 |
| 43 @override | 39 @override |
| 44 void visitElement(Element element) { | 40 void visitElement(Element element) { |
| 45 bool visitChildren = processor(element); | 41 bool visitChildren = processor(element); |
| 46 if (visitChildren == true) { | 42 if (visitChildren == true) { |
| 47 element.visitChildren(this); | 43 element.visitChildren(this); |
| 48 } | 44 } |
| 49 } | 45 } |
| 50 } | 46 } |
| 51 | 47 |
| 52 | |
| 53 /** | 48 /** |
| 54 * A [GeneralizingElementVisitor] for visiting top-level elements. | 49 * A [GeneralizingElementVisitor] for visiting top-level elements. |
| 55 */ | 50 */ |
| 56 class _TopLevelElementsVisitor extends GeneralizingElementVisitor { | 51 class _TopLevelElementsVisitor extends GeneralizingElementVisitor { |
| 57 final ElementProcessor processor; | 52 final ElementProcessor processor; |
| 58 | 53 |
| 59 _TopLevelElementsVisitor(this.processor); | 54 _TopLevelElementsVisitor(this.processor); |
| 60 | 55 |
| 61 @override | 56 @override |
| 62 void visitElement(Element element) { | 57 void visitElement(Element element) { |
| 63 if (element is CompilationUnitElement) { | 58 if (element is CompilationUnitElement) { |
| 64 element.visitChildren(this); | 59 element.visitChildren(this); |
| 65 } else { | 60 } else { |
| 66 processor(element); | 61 processor(element); |
| 67 } | 62 } |
| 68 } | 63 } |
| 69 } | 64 } |
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