| // 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/visitor.dart'; |
| |
| import '../analyzer.dart'; |
| |
| const _desc = r'Avoid relative imports for files in `lib/`.'; |
| |
| const _details = r'''*DO* avoid relative imports for files in `lib/`. |
| |
| When mixing relative and absolute imports it's possible to create confusion |
| where the same member gets imported in two different ways. An easy way to avoid |
| that is to ensure you have no relative imports that include `lib/` in their |
| paths. |
| |
| **GOOD:** |
| |
| ``` |
| import 'package:foo/bar.dart'; |
| |
| import 'baz.dart'; |
| |
| ... |
| ``` |
| |
| **BAD:** |
| |
| ``` |
| import 'package:foo/bar.dart'; |
| |
| import '../lib/baz.dart'; |
| |
| ... |
| ``` |
| |
| '''; |
| |
| class AvoidRelativeLibImports extends LintRule implements NodeLintRule { |
| AvoidRelativeLibImports() |
| : super( |
| name: 'avoid_relative_lib_imports', |
| description: _desc, |
| details: _details, |
| group: Group.errors); |
| |
| @override |
| void registerNodeProcessors( |
| NodeLintRegistry registry, LinterContext context) { |
| final visitor = _Visitor(this); |
| registry.addImportDirective(this, visitor); |
| } |
| } |
| |
| class _Visitor extends SimpleAstVisitor<void> { |
| final LintRule rule; |
| |
| _Visitor(this.rule); |
| |
| bool isRelativeLibImport(ImportDirective node) { |
| try { |
| final uri = Uri.parse(node.uriContent); |
| if (uri.scheme.isEmpty) { |
| return uri.path.contains('/lib/'); |
| } |
| // ignore: avoid_catches_without_on_clauses |
| } catch (e) { |
| // Ignore. |
| } |
| return false; |
| } |
| |
| @override |
| void visitImportDirective(ImportDirective node) { |
| if (isRelativeLibImport(node)) { |
| rule.reportLint(node.uri); |
| } |
| } |
| } |