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Add analyzer 'Add/remove trailing comma' (#931)
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139 changes: 139 additions & 0 deletions
139
src/Analyzers.CodeFixes/CSharp/CodeFixes/AddOrRemoveTrailingCommaCodeFixProvider.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright (c) Josef Pihrt and Contributors. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. | ||
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| using System.Collections.Immutable; | ||
| using System.Composition; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.CodeAnalysis; | ||
| using Microsoft.CodeAnalysis.CodeActions; | ||
| using Microsoft.CodeAnalysis.CodeFixes; | ||
| using Microsoft.CodeAnalysis.CSharp; | ||
| using Microsoft.CodeAnalysis.CSharp.Syntax; | ||
| using Microsoft.CodeAnalysis.Text; | ||
| using Roslynator.CodeFixes; | ||
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| namespace Roslynator.CSharp.CodeFixes; | ||
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| [ExportCodeFixProvider(LanguageNames.CSharp, Name = nameof(AddOrRemoveTrailingCommaCodeFixProvider))] | ||
| [Shared] | ||
| public sealed class AddOrRemoveTrailingCommaCodeFixProvider : BaseCodeFixProvider | ||
| { | ||
| public override ImmutableArray<string> FixableDiagnosticIds | ||
| { | ||
| get { return ImmutableArray.Create(DiagnosticIdentifiers.AddOrRemoveTrailingComma); } | ||
| } | ||
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| public override async Task RegisterCodeFixesAsync(CodeFixContext context) | ||
| { | ||
| SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false); | ||
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| if (!TryFindFirstAncestorOrSelf( | ||
| root, | ||
| context.Span, | ||
| out SyntaxNode node, | ||
| predicate: f => f.IsKind( | ||
| SyntaxKind.ArrayInitializerExpression, | ||
| SyntaxKind.ObjectInitializerExpression, | ||
| SyntaxKind.CollectionInitializerExpression, | ||
| SyntaxKind.EnumDeclaration, | ||
| SyntaxKind.AnonymousObjectCreationExpression))) | ||
| { | ||
| return; | ||
| } | ||
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| Diagnostic diagnostic = context.Diagnostics[0]; | ||
| Document document = context.Document; | ||
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| if (node is InitializerExpressionSyntax initializer) | ||
| { | ||
| SeparatedSyntaxList<ExpressionSyntax> expressions = initializer.Expressions; | ||
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| int count = expressions.Count; | ||
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| if (count == expressions.SeparatorCount) | ||
| { | ||
| CodeAction codeAction = CodeAction.Create( | ||
| "Remove comma", | ||
| ct => RemoveTrailingComma(document, expressions.GetSeparator(count - 1), ct), | ||
| GetEquivalenceKey(diagnostic)); | ||
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| context.RegisterCodeFix(codeAction, diagnostic); | ||
| } | ||
| else | ||
| { | ||
| CodeAction codeAction = CodeAction.Create( | ||
| "Add comma", | ||
| ct => AddTrailingComma(document, expressions.Last(), ct), | ||
| GetEquivalenceKey(diagnostic)); | ||
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| context.RegisterCodeFix(codeAction, diagnostic); | ||
| } | ||
| } | ||
| else if (node is AnonymousObjectCreationExpressionSyntax objectCreation) | ||
| { | ||
| SeparatedSyntaxList<AnonymousObjectMemberDeclaratorSyntax> initializers = objectCreation.Initializers; | ||
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| int count = initializers.Count; | ||
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| if (count == initializers.SeparatorCount) | ||
| { | ||
| CodeAction codeAction = CodeAction.Create( | ||
| "Remove comma", | ||
| ct => RemoveTrailingComma(document, initializers.GetSeparator(count - 1), ct), | ||
| GetEquivalenceKey(diagnostic)); | ||
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| context.RegisterCodeFix(codeAction, diagnostic); | ||
| } | ||
| else | ||
| { | ||
| CodeAction codeAction = CodeAction.Create( | ||
| "Add comma", | ||
| ct => AddTrailingComma(document, initializers.Last(), ct), | ||
| GetEquivalenceKey(diagnostic)); | ||
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| context.RegisterCodeFix(codeAction, diagnostic); | ||
| } | ||
| } | ||
| else if (node is EnumDeclarationSyntax enumDeclaration) | ||
| { | ||
| SeparatedSyntaxList<EnumMemberDeclarationSyntax> members = enumDeclaration.Members; | ||
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| int count = members.Count; | ||
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| if (count == members.SeparatorCount) | ||
| { | ||
| CodeAction codeAction = CodeAction.Create( | ||
| "Remove comma", | ||
| ct => RemoveTrailingComma(document, members.GetSeparator(count - 1), ct), | ||
| GetEquivalenceKey(diagnostic)); | ||
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| context.RegisterCodeFix(codeAction, diagnostic); | ||
| } | ||
| else | ||
| { | ||
| CodeAction codeAction = CodeAction.Create( | ||
| "Add comma", | ||
| ct => AddTrailingComma(document, members.Last(), ct), | ||
| GetEquivalenceKey(diagnostic)); | ||
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| context.RegisterCodeFix(codeAction, diagnostic); | ||
| } | ||
| } | ||
| } | ||
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| private static Task<Document> RemoveTrailingComma( | ||
| Document document, | ||
| SyntaxToken comma, | ||
| CancellationToken cancellationToken) | ||
| { | ||
| return document.WithTextChangeAsync(new TextChange(comma.Span, ""), cancellationToken); | ||
| } | ||
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| private static Task<Document> AddTrailingComma( | ||
| Document document, | ||
| SyntaxNode lastNode, | ||
| CancellationToken cancellationToken) | ||
| { | ||
| return document.WithTextChangeAsync(new TextChange(new TextSpan(lastNode.Span.End, 0), ","), cancellationToken); | ||
| } | ||
| } |
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