| // Copyright (c) 2019, 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'; |
| import '../util/dart_type_utilities.dart'; |
| |
| const _desc = |
| r'Prefer an 8-digit hexadecimal integer(0xFFFFFFFF) to instantiate Color.'; |
| |
| const _details = r''' |
| |
| Prefer an 8-digit hexadecimal integer(0xFFFFFFFF) to instantiate Color. Colors |
| have four 8-bit channels, which adds up to 32 bits, so Colors are described |
| using a 32 bit integer. |
| |
| **BAD:** |
| ``` |
| Color(1); |
| Color(0x000001); |
| ``` |
| |
| **GOOD:** |
| ``` |
| Color(0x00000001); |
| ``` |
| |
| '''; |
| |
| class UseFullHexValuesForFlutterColors extends LintRule |
| implements NodeLintRule { |
| UseFullHexValuesForFlutterColors() |
| : super( |
| name: 'use_full_hex_values_for_flutter_colors', |
| description: _desc, |
| details: _details, |
| group: Group.style); |
| |
| @override |
| void registerNodeProcessors( |
| NodeLintRegistry registry, LinterContext context) { |
| final visitor = _Visitor(this); |
| registry.addInstanceCreationExpression(this, visitor); |
| } |
| } |
| |
| class _Visitor extends SimpleAstVisitor { |
| final LintRule rule; |
| |
| _Visitor(this.rule); |
| |
| @override |
| void visitInstanceCreationExpression(InstanceCreationExpression node) { |
| if (DartTypeUtilities.isConstructorElement(node.staticElement, |
| uriStr: 'dart.ui', className: 'Color', constructorName: '')) { |
| final arguments = node.argumentList.arguments; |
| if (arguments.isNotEmpty) { |
| final argument = arguments.first; |
| if (argument is IntegerLiteral) { |
| final value = argument.literal.lexeme; |
| if (!value.startsWith('0x') || value.length != 10) { |
| rule.reportLint(argument); |
| } |
| } |
| } |
| } |
| } |
| } |