| // Copyright (c) 2018, 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. |
| |
| import 'package:analyzer/dart/ast/ast.dart'; |
| import 'package:analyzer/dart/ast/token.dart'; |
| import 'package:analyzer/dart/ast/visitor.dart'; |
| |
| import '../analyzer.dart'; |
| |
| const _desc = r'Use `=` to separate a named parameter from its default value.'; |
| |
| const _details = r''' |
| |
| From the [style guide](https://dart.dev/guides/language/effective-dart/usage): |
| |
| **DO** Use `=` to separate a named parameter from its default value. |
| |
| **BAD:** |
| ``` |
| m({a: 1}) |
| ``` |
| |
| **GOOD:** |
| ``` |
| m({a = 1}) |
| ``` |
| |
| '''; |
| |
| class PreferEqualForDefaultValues extends LintRule implements NodeLintRule { |
| PreferEqualForDefaultValues() |
| : super( |
| name: 'prefer_equal_for_default_values', |
| description: _desc, |
| details: _details, |
| group: Group.style); |
| |
| @override |
| void registerNodeProcessors( |
| NodeLintRegistry registry, LinterContext context) { |
| final visitor = _Visitor(this); |
| registry.addDefaultFormalParameter(this, visitor); |
| } |
| } |
| |
| class _Visitor extends SimpleAstVisitor<void> { |
| final LintRule rule; |
| |
| _Visitor(this.rule); |
| |
| @override |
| void visitDefaultFormalParameter(DefaultFormalParameter node) { |
| if (node.isNamed && node.separator?.type == TokenType.COLON) { |
| rule.reportLintForToken(node.separator); |
| } |
| } |
| } |