private static void AnalyzeIfStatement(SyntaxNodeAnalysisContext context)
{
var ifStatement = (IfStatementSyntax)context.Node;
foreach (IfRefactoring refactoring in IfRefactoring.Analyze(ifStatement, AnalysisOptions, context.SemanticModel, context.CancellationToken))
{
Debug.Assert(refactoring.Kind == RefactoringKind.IfElseToAssignmentWithCoalesceExpression ||
refactoring.Kind == RefactoringKind.IfElseToReturnWithCoalesceExpression ||
refactoring.Kind == RefactoringKind.IfElseToYieldReturnWithCoalesceExpression ||
refactoring.Kind == RefactoringKind.IfReturnToReturnWithCoalesceExpression, refactoring.Kind.ToString());
context.ReportDiagnostic(DiagnosticDescriptors.UseCoalesceExpressionInsteadOfIf, ifStatement);
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
IfStatementSyntax ifStatement = root
.FindNode(context.Span, getInnermostNodeForTie: true)?
.FirstAncestorOrSelf <IfStatementSyntax>();
Debug.Assert(ifStatement != null, $"{nameof(ifStatement)} is null");
if (ifStatement == null)
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.MergeIfStatementWithNestedIfStatement:
{
CodeAction codeAction = CodeAction.Create(
"Merge if with nested if",
cancellationToken =>
{
return(MergeIfStatementWithNestedIfStatementRefactoring.RefactorAsync(
context.Document,
ifStatement,
cancellationToken));
},
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.ReplaceIfStatementWithAssignment:
{
CodeAction codeAction = CodeAction.Create(
"Replace if with assignment",
cancellationToken =>
{
return(ReplaceIfStatementWithAssignmentRefactoring.RefactorAsync(
context.Document,
ifStatement,
cancellationToken));
},
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseCoalesceExpressionInsteadOfIf:
{
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
IfRefactoring refactoring = IfRefactoring.Analyze(
ifStatement,
UseCoalesceExpressionInsteadOfIfDiagnosticAnalyzer.AnalysisOptions,
semanticModel,
context.CancellationToken).First();
CodeAction codeAction = CodeAction.Create(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out IfStatementSyntax ifStatement))
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.MergeIfStatementWithNestedIfStatement:
{
CodeAction codeAction = CodeAction.Create(
"Merge if with nested if",
cancellationToken =>
{
return(MergeIfStatementWithNestedIfStatementRefactoring.RefactorAsync(
context.Document,
ifStatement,
cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.ReplaceIfStatementWithAssignment:
{
CodeAction codeAction = CodeAction.Create(
"Replace if with assignment",
cancellationToken =>
{
return(ReplaceIfStatementWithAssignmentRefactoring.RefactorAsync(
context.Document,
ifStatement,
cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseCoalesceExpressionInsteadOfIf:
{
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
IfRefactoring refactoring = IfRefactoring.Analyze(
ifStatement,
UseCoalesceExpressionInsteadOfIfDiagnosticAnalyzer.AnalysisOptions,
semanticModel,
context.CancellationToken).First();
CodeAction codeAction = CodeAction.Create(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, cancellationToken),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.ReduceIfNesting:
{
CodeAction codeAction = CodeAction.Create(
"Reduce if nesting",
cancellationToken =>
{
return(ReduceIfNestingRefactoring.RefactorAsync(
context.Document,
ifStatement,
recursive: true,
cancellationToken: cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}