pkg/linter/lib/src/rules/combinators_ordering.dart

// Copyright (c) 2022, 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 'package:analyzer/error/error.dart';
import 'package:collection/collection.dart';

import '../analyzer.dart';

const _desc = r'Sort combinator names alphabetically.';

class CombinatorsOrdering extends LintRule {
  CombinatorsOrdering()
    : super(name: LintNames.combinators_ordering, description: _desc);

  @override
  DiagnosticCode get diagnosticCode => LinterLintCode.combinators_ordering;

  @override
  void registerNodeProcessors(
    NodeLintRegistry registry,
    LinterContext context,
  ) {
    var visitor = _Visitor(this);
    registry.addHideCombinator(this, visitor);
    registry.addShowCombinator(this, visitor);
  }
}

class _Visitor extends SimpleAstVisitor<void> {
  final LintRule rule;

  _Visitor(this.rule);

  @override
  void visitHideCombinator(HideCombinator node) {
    if (!node.hiddenNames.map((e) => e.name).isSorted()) {
      rule.reportAtNode(node);
    }
  }

  @override
  void visitShowCombinator(ShowCombinator node) {
    if (!node.shownNames.map((e) => e.name).isSorted()) {
      rule.reportAtNode(node);
    }
  }
}