private void AnalyzeAssignmentExpression(SyntaxNodeAnalysisContext context)
{
if (GeneratedCodeAnalyzer?.IsGeneratedCode(context) == true)
{
return;
}
var assignment = (AssignmentExpressionSyntax)context.Node;
ExpressionSyntax left = assignment.Left;
ExpressionSyntax right = assignment.Right;
if (left?.IsMissing == false &&
right?.IsNumericLiteralExpression(1) == true)
{
ITypeSymbol typeSymbol = context.SemanticModel.GetTypeInfo(left, context.CancellationToken).Type;
if (typeSymbol?.SupportsPrefixOrPostfixUnaryOperator() == true &&
!assignment.SpanContainsDirectives())
{
context.ReportDiagnostic(
DiagnosticDescriptors.UsePostfixUnaryOperatorInsteadOfAssignment,
assignment.GetLocation(),
UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.GetOperatorText(assignment));
}
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out AssignmentExpressionSyntax assignment))
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.UseCompoundAssignment:
{
var binaryExpression = (BinaryExpressionSyntax)assignment.Right;
string operatorText = UseCompoundAssignmentRefactoring.GetCompoundOperatorText(binaryExpression);
CodeAction codeAction = CodeAction.Create(
$"Use {operatorText} operator",
cancellationToken => UseCompoundAssignmentRefactoring.RefactorAsync(context.Document, assignment, cancellationToken),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UsePostfixUnaryOperatorInsteadOfAssignment:
{
string operatorText = UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.GetOperatorText(assignment);
CodeAction codeAction = CodeAction.Create(
$"Use {operatorText} operator",
c => UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.RefactorAsync(context.Document, assignment, c),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.RemoveRedundantDelegateCreation:
{
CodeAction codeAction = CodeAction.Create(
"Remove redundant delegate creation",
cancellationToken =>
{
return(RemoveRedundantDelegateCreationRefactoring.RefactorAsync(
context.Document,
(ObjectCreationExpressionSyntax)assignment.Right,
cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}
private void AnalyzeSimpleAssignment(SyntaxNodeAnalysisContext context)
{
if (GeneratedCodeAnalyzer?.IsGeneratedCode(context) == true)
{
return;
}
var assignment = (AssignmentExpressionSyntax)context.Node;
ExpressionSyntax left = assignment.Left;
ExpressionSyntax right = assignment.Right;
if (left?.IsMissing == false &&
right?.IsMissing == false)
{
if (!assignment.IsParentKind(SyntaxKind.ObjectInitializerExpression) &&
SupportsCompoundAssignment(right))
{
var binaryExpression = (BinaryExpressionSyntax)right;
ExpressionSyntax binaryLeft = binaryExpression.Left;
ExpressionSyntax binaryRight = binaryExpression.Right;
if (binaryLeft?.IsMissing == false &&
binaryRight?.IsMissing == false &&
left.IsEquivalentTo(binaryLeft, topLevel: false) &&
ContainsOnlyWhitespaceOrEndOfLineTrivia(assignment))
{
context.ReportDiagnostic(
DiagnosticDescriptors.SimplifyAssignmentExpression,
assignment.GetLocation());
context.FadeOutNode(DiagnosticDescriptors.SimplifyAssignmentExpressionFadeOut, binaryLeft);
}
}
if (right.IsKind(SyntaxKind.AddExpression, SyntaxKind.SubtractExpression))
{
var binaryExpression = (BinaryExpressionSyntax)right;
ExpressionSyntax binaryLeft = binaryExpression.Left;
ExpressionSyntax binaryRight = binaryExpression.Right;
if (binaryLeft?.IsMissing == false &&
binaryRight?.IsNumericLiteralExpression(1) == true)
{
ITypeSymbol typeSymbol = context.SemanticModel.GetTypeInfo(left, context.CancellationToken).Type;
if (typeSymbol?.SupportsPrefixOrPostfixUnaryOperator() == true &&
left.IsEquivalentTo(binaryLeft, topLevel: false) &&
!assignment.SpanContainsDirectives())
{
context.ReportDiagnostic(
DiagnosticDescriptors.UsePostfixUnaryOperatorInsteadOfAssignment,
assignment.GetLocation(),
UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.GetOperatorText(assignment));
}
}
}
}
}
private void AnalyzeAssignmentExpression(SyntaxNodeAnalysisContext context)
{
var assignment = (AssignmentExpressionSyntax)context.Node;
UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.Analyze(context, assignment);
RemoveRedundantDelegateCreationRefactoring.Analyze(context, assignment);
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
AssignmentExpressionSyntax assignment = root
.FindNode(context.Span, getInnermostNodeForTie: true)?
.FirstAncestorOrSelf <AssignmentExpressionSyntax>();
if (assignment == null)
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.SimplifyAssignmentExpression:
{
CodeAction codeAction = CodeAction.Create(
"Simplify assignment expression",
cancellationToken =>
{
return(SimplifyAssignmentExpressionRefactoring.RefactorAsync(
context.Document,
assignment,
cancellationToken));
},
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UsePostfixUnaryOperatorInsteadOfAssignment:
{
SyntaxKind kind = UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.GetPostfixUnaryOperatorKind(assignment);
string operatorText = UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.GetOperatorText(kind);
CodeAction codeAction = CodeAction.Create(
$"Use {operatorText} operator",
cancellationToken =>
{
return(UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.RefactorAsync(
context.Document,
assignment,
kind,
cancellationToken));
},
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}
private void AnalyzeSimpleAssignment(SyntaxNodeAnalysisContext context)
{
var assignment = (AssignmentExpressionSyntax)context.Node;
if (UseCompoundAssignmentRefactoring.CanRefactor(assignment))
{
var binaryExpression = (BinaryExpressionSyntax)assignment.Right;
context.ReportDiagnostic(DiagnosticDescriptors.UseCompoundAssignment, assignment, UseCompoundAssignmentRefactoring.GetCompoundOperatorText(binaryExpression));
context.ReportNode(DiagnosticDescriptors.UseCompoundAssignmentFadeOut, binaryExpression.Left);
}
UsePostfixUnaryOperatorInsteadOfAssignmentRefactoring.Analyze(context, assignment);
}
