Linter Demo

Errors: 0

Warnings: 1

File: /home/fstrocco/Dart/dart/benchmark/linter/lib/src/rules/unnecessary_brace_in_string_interp.dart

// 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.unnecessary_brace_in_string_interp; import 'package:analyzer/src/generated/ast.dart'; import 'package:analyzer/src/generated/scanner.dart'; import 'package:linter/src/linter.dart'; const desc = 'Avoid using braces in interpolation when not needed.'; const details = r''' **AVOID** using braces in interpolation when not needed. If you're just interpolating a simple identifier, and it's not immediately followed by more alphanumeric text, the `{}` can and should be omitted. **GOOD:** ```dart print("Hi, $name!"); ``` **BAD:** ```dart print("Hi, ${name}!"); ``` '''; final RegExp identifierPart = new RegExp(r'^[a-zA-Z0-9_]'); bool isIdentifierPart(Token token) => token is StringToken && token.lexeme.startsWith(identifierPart); class UnnecessaryBraceInStringInterp extends LintRule { UnnecessaryBraceInStringInterp() : super( name: 'unnecessary_brace_in_string_interp', description: desc, details: details, group: Group.style); @override AstVisitor getVisitor() => new Visitor(this); } class Visitor extends SimpleAstVisitor { LintRule rule; Visitor(this.rule); @override visitStringInterpolation(StringInterpolation node) { var expressions = node.elements.where((e) => e is InterpolationExpression); for (InterpolationExpression expression in expressions) { if (expression.expression is SimpleIdentifier) { Token bracket = expression.rightBracket; if (bracket != null && !isIdentifierPart(bracket.next)) { rule.reportLint(expression); } } } } }