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Side by Side Diff: pkg/analysis_server/lib/src/services/completion/inherited_contributor.dart

Issue 1467023002: step toward new completion API (Closed) Base URL: git@github.com:dart-lang/sdk.git@master
Patch Set: address comments and merge Created 5 years ago
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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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.
4
5 library services.completion.computer.dart.invocation;
6
7 import 'package:analysis_server/plugin/edit/utilities/change_builder_dart.dart';
8 import 'package:analysis_server/src/protocol_server.dart'
9 show CompletionSuggestion, CompletionSuggestionKind, SourceChange;
10 import 'package:analysis_server/src/protocol_server.dart' as protocol
11 hide CompletionSuggestion, CompletionSuggestionKind;
12 import 'package:analysis_server/src/provisional/completion/completion_dart.dart' ;
13 import 'package:analysis_server/src/services/completion/dart_completion_manager. dart'
14 show DART_RELEVANCE_HIGH;
15 import 'package:analyzer/src/generated/ast.dart';
16 import 'package:analyzer/src/generated/element.dart';
17 import 'package:analyzer/src/generated/engine.dart';
18 import 'package:analyzer/src/generated/resolver.dart';
19 import 'package:analyzer/src/generated/source.dart';
20
21 /**
22 * A completion contributor used to suggest replacing partial identifiers inside
23 * a class declaration with templates for inherited members.
24 */
25 class InheritedContributor extends DartCompletionContributor {
26 @override
27 List<CompletionSuggestion> internalComputeSuggestions(
28 DartCompletionRequest request) {
29 if (!request.isResolved) {
30 return null;
31 }
32 AstNode node = new NodeLocator(request.offset).searchWithin(request.unit);
33 if (node == null || !_isMemberLevelIdentifier(node)) {
34 return null;
35 }
36 ClassDeclaration classDeclaration =
37 node.getAncestor((AstNode node) => node is ClassDeclaration);
38 if (classDeclaration != null) {
39 ClassElement element = classDeclaration.element;
40 if (element == null) {
41 return null;
42 }
43 return _suggestInheritedMembers(request, node, element);
44 }
45 return null;
46 }
47
48 /**
49 * Return a template for an override of the given [element] in the given
50 * [source]. If selected, the template will replace the given [identifier].
51 */
52 String _buildRepacementText(
53 Source source, SimpleIdentifier identifier, Element element) {
54 AnalysisContext context = element.context;
55 DartChangeBuilder builder = new DartChangeBuilder(context);
56 builder.addFileEdit(source, context.getModificationStamp(source),
57 (DartFileEditBuilder builder) {
58 builder.addReplacement(identifier.offset, identifier.length,
59 (DartEditBuilder builder) {
60 builder.writeOverrideOfInheritedMember(element);
61 });
62 });
63 return builder.sourceChange.edits[0].edits[0].replacement.trim();
64 }
65
66 /**
67 * Build a suggestion to replace the partial [identifier] in the given
68 * [source] with an override of the given [element].
69 */
70 CompletionSuggestion _buildSuggestion(
71 Source source, SimpleIdentifier identifier, Element element) {
72 String completion = _buildRepacementText(source, identifier, element);
73 CompletionSuggestion suggestion = new CompletionSuggestion(
74 CompletionSuggestionKind.IDENTIFIER,
75 DART_RELEVANCE_HIGH,
76 completion,
77 identifier.offset,
78 0,
79 element.isDeprecated,
80 false);
81 suggestion.element = protocol.convertElement(element);
82 return suggestion;
83 }
84
85 /**
86 * Return a list containing the names of all of the inherited by not
87 * implemented members of the class represented by the given [element] that
88 * start with the given [prefix]. The [map] is used to find all of the members
89 * that are inherited.
90 */
91 List<String> _computeMemberNames(
92 MemberMap map, ClassElement element, String prefix) {
93 List<String> memberNames = <String>[];
94 int count = map.size;
95 for (int i = 0; i < count; i++) {
96 String memberName = map.getKey(i);
97 if (memberName.startsWith(prefix) && !_hasMember(element, memberName)) {
98 memberNames.add(memberName);
99 }
100 }
101 return memberNames;
102 }
103
104 /**
105 * Return `true` if the given [classElement] directly declares a member with
106 * the given [memberName].
107 */
108 bool _hasMember(ClassElement classElement, String memberName) {
109 return classElement.getField(memberName) != null ||
110 classElement.getGetter(memberName) != null ||
111 classElement.getMethod(memberName) != null ||
112 classElement.getSetter(memberName) != null;
113 }
114
115 /**
116 * Return `true` if the given [node] looks like a partial identifier inside a
117 * class declaration.
118 */
119 bool _isMemberLevelIdentifier(AstNode node) {
120 if (node is SimpleIdentifier) {
121 AstNode parent1 = node.parent;
122 if (parent1 is TypeName) {
123 AstNode parent2 = parent1.parent;
124 if (parent2 is VariableDeclarationList) {
125 AstNode parent3 = parent2.parent;
126 if (parent3 is FieldDeclaration) {
127 NodeList<VariableDeclaration> variables = parent2.variables;
128 return variables.length == 1 && variables[0].name.name.isEmpty;
129 }
130 }
131 }
132 }
133 return false;
134 }
135
136 /**
137 * Add any suggestions that are appropriate to the given [request], using the
138 * given [element] to find inherited members whose name has the given
139 * [identifier] as a prefix.
140 */
141 List<CompletionSuggestion> _suggestInheritedMembers(
142 DartCompletionRequest request,
143 SimpleIdentifier identifier,
144 ClassElement element) {
145 String name = identifier.name;
146 InheritanceManager manager = new InheritanceManager(element.library);
147 MemberMap map = manager.getMapOfMembersInheritedFromInterfaces(element);
148 List<String> memberNames = _computeMemberNames(map, element, name);
149 memberNames.sort();
150 List<CompletionSuggestion> suggestions = <CompletionSuggestion>[];
151 for (String memberName in memberNames) {
152 CompletionSuggestion suggestion =
153 _buildSuggestion(request.source, identifier, map.get(memberName));
154 if (suggestion != null) {
155 suggestions.add(suggestion);
156 }
157 }
158 return suggestions;
159 }
160 }
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