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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Host.Mef;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.AssignOutParameters;
[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.AssignOutParametersAtStart), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class AssignOutParametersAtStartCodeFixProvider() : AbstractAssignOutParametersCodeFixProvider
{
protected override void TryRegisterFix(CodeFixContext context, Document document, SyntaxNode container, SyntaxNode location)
{
// Don't offer if we're already the starting statement of the container. This case will
// be handled by the AssignOutParametersAboveReturnCodeFixProvider class.
if (location is ExpressionSyntax)
{
return;
}
if (location is LocalFunctionStatementSyntax { ExpressionBody: { } })
{
// This is an expression-bodied local function, which is also handled by the other code fix.
return;
}
if (location is StatementSyntax statement &&
statement.Parent is BlockSyntax block &&
block.Statements[0] == statement &&
block.Parent == container)
{
return;
}
context.RegisterCodeFix(
CodeAction.Create(
CSharpCodeFixesResources.Assign_out_parameters_at_start,
GetDocumentUpdater(context),
nameof(CSharpCodeFixesResources.Assign_out_parameters_at_start)),
context.Diagnostics);
}
protected override void AssignOutParameters(
SyntaxEditor editor, SyntaxNode container,
MultiDictionary<SyntaxNode, (SyntaxNode exprOrStatement, ImmutableArray<IParameterSymbol> unassignedParameters)>.ValueSet values,
CancellationToken cancellationToken)
{
var generator = editor.Generator;
var unassignedParameters =
values.SelectMany(t => t.unassignedParameters)
.Distinct()
.OrderBy(p => p.DeclaringSyntaxReferences[0].GetSyntax(cancellationToken).SpanStart)
.ToImmutableArray();
var statements = GenerateAssignmentStatements(generator, unassignedParameters);
var originalStatements = generator.GetStatements(container).ToImmutableArray();
var finalStatements = statements.AddRange(originalStatements);
var updatedContainer = generator.WithStatements(container, finalStatements);
editor.ReplaceNode(container, updatedContainer);
}
}
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