The 'analysis.implemented' notification implementation.

pkg/analysis_server/lib/src/domains/analysis/implemented_dart.dart

+// Copyright (c) 2015, 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 domains.analysis.implemented_dart;
+
+import 'package:analysis_server/src/protocol_server.dart' as protocol;
+import 'package:analysis_server/src/services/search/hierarchy.dart';
+import 'package:analysis_server/src/services/search/search_engine.dart';
+import 'package:analyzer/src/generated/element.dart';
+
+class ImplementedComputer {
+  final SearchEngine searchEngine;
+  final CompilationUnitElement unitElement;
+
+  List<protocol.ImplementedClass> classes = <protocol.ImplementedClass>[];
+  List<protocol.ImplementedMember> members = <protocol.ImplementedMember>[];
+
+  Set<ClassElement> subtypes;
+
+  ImplementedComputer(this.searchEngine, this.unitElement);
+
+  compute() async {
+    for (ClassElement type in unitElement.types) {
+      subtypes = await getSubClasses(searchEngine, type);
+      if (subtypes.isNotEmpty) {
+        _addImplementedClass(type);
+      }
+      type.accessors.forEach(_addMemberIfImplemented);
+      type.fields.forEach(_addMemberIfImplemented);
+      type.methods.forEach(_addMemberIfImplemented);
+    }
+  }
+
+  void _addImplementedClass(ClassElement type) {
+    String name = type.name;
+    if (name != null) {
+      int offset = type.nameOffset;
+      int length = name.length;
+      classes.add(new protocol.ImplementedClass(offset, length));
+    }
+  }
+
+  void _addImplementedMember(Element member) {
+    String name = member.displayName;
+    if (name != null) {
+      int offset = member.nameOffset;
+      int length = name.length;
+      members.add(new protocol.ImplementedMember(offset, length));
+    }
+  }
+
+  void _addMemberIfImplemented(Element element) {
+    if (!element.isSynthetic) {
+      String name = element.displayName;
+      if (name != null && _hasOverride(name)) {
+        _addImplementedMember(element);
+      }
+    }
+  }
+
+  bool _hasOverride(String name) {
+    for (ClassElement subtype in subtypes) {
+      if (subtype.getMethod(name) != null) {
+        return true;
+      }
+      if (subtype.getField(name) != null) {
+        return true;
+      }
+    }
+    return false;
+  }
+}