| // Copyright (c) 2020, 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/visitor.dart'; |
| |
| import '../analyzer.dart'; |
| |
| const _desc = r'Unnecessary raw string.'; |
| |
| const _details = r''' |
| |
| Use raw string only when needed. |
| |
| **BAD:** |
| ``` |
| var s1 = r'a'; |
| ``` |
| |
| **GOOD:** |
| ``` |
| var s1 = 'a'; |
| var s2 = r'$a'; |
| var s3 = r'\a'; |
| ``` |
| |
| '''; |
| |
| class UnnecessaryRawStrings extends LintRule implements NodeLintRule { |
| UnnecessaryRawStrings() |
| : super( |
| name: 'unnecessary_raw_strings', |
| description: _desc, |
| details: _details, |
| group: Group.style); |
| |
| @override |
| void registerNodeProcessors(NodeLintRegistry registry, |
| [LinterContext context]) { |
| final visitor = _Visitor(this); |
| registry.addSimpleStringLiteral(this, visitor); |
| } |
| } |
| |
| class _Visitor extends SimpleAstVisitor<void> { |
| final LintRule rule; |
| |
| _Visitor(this.rule); |
| |
| @override |
| void visitSimpleStringLiteral(SimpleStringLiteral node) { |
| if (node.isRaw && ![r'\', r'$'].any(node.literal.lexeme.contains)) { |
| rule.reportLint(node); |
| } |
| } |
| } |