| // 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 linter.src.rules.always_declare_return_types; |
| |
| import 'package:analyzer/dart/ast/ast.dart' |
| show AstVisitor, FunctionDeclaration, FunctionTypeAlias, MethodDeclaration; |
| import 'package:analyzer/dart/ast/token.dart'; |
| import 'package:analyzer/dart/ast/visitor.dart'; |
| import 'package:linter/src/analyzer.dart'; |
| |
| const desc = 'Declare method return types.'; |
| |
| const details = ''' |
| **DO** declare method return types. |
| |
| When declaring a method or function *always* specify a return type. |
| |
| **BAD:** |
| ``` |
| main() { } |
| |
| _bar() => new _Foo(); |
| |
| class _Foo { |
| _foo() => 42; |
| } |
| ``` |
| |
| **GOOD:** |
| ``` |
| void main() { } |
| |
| _Foo _bar() => new _Foo(); |
| |
| class _Foo { |
| int _foo() => 42; |
| } |
| |
| typedef bool predicate(Object o); |
| ``` |
| '''; |
| |
| class AlwaysDeclareReturnTypes extends LintRule { |
| AlwaysDeclareReturnTypes() |
| : super( |
| name: 'always_declare_return_types', |
| description: desc, |
| details: details, |
| group: Group.style); |
| |
| @override |
| AstVisitor getVisitor() => new Visitor(this); |
| } |
| |
| class Visitor extends SimpleAstVisitor { |
| final LintRule rule; |
| Visitor(this.rule); |
| |
| @override |
| visitFunctionDeclaration(FunctionDeclaration node) { |
| if (!node.isSetter && node.returnType == null) { |
| rule.reportLint(node.name); |
| } |
| } |
| |
| @override |
| visitFunctionTypeAlias(FunctionTypeAlias node) { |
| if (node.returnType == null) { |
| rule.reportLint(node.name); |
| } |
| } |
| |
| @override |
| visitMethodDeclaration(MethodDeclaration node) { |
| if (!node.isSetter && |
| node.returnType == null && |
| node.name.token.type != TokenType.INDEX_EQ) { |
| rule.reportLint(node.name); |
| } |
| } |
| } |