private static StatementContainer GetStatementContainer(SyntaxNode node)
{
SyntaxNode parent = node.Parent;
if (parent != null)
{
StatementContainer container;
if (StatementContainer.TryCreate(parent, out container))
{
return(container);
}
}
return(null);
}
private StatementContainer GetStatementContainer(BinaryExpressionSyntax binaryExpression)
{
SyntaxNode node = binaryExpression.Parent.Parent;
if (node != null)
{
StatementContainer container;
if (StatementContainer.TryCreate(node, out container))
{
return(container);
}
}
return(null);
}
private static async Task<Document> RefactorAsync(
Document document,
ExpressionSyntax expression,
StatementSyntax statement,
CancellationToken cancellationToken)
{
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (EmbeddedStatement.IsEmbeddedStatement(statement))
{
return await document.ReplaceNodeAsync(statement, Block(statement, CreateNullCheck(expression)), cancellationToken).ConfigureAwait(false);
}
else
{
IStatementContainer container;
if (StatementContainer.TryCreate(statement, out container))
{
SyntaxList<StatementSyntax> statements = container.Statements;
int statementIndex = statements.IndexOf(statement);
ISymbol symbol = (statement.IsKind(SyntaxKind.LocalDeclarationStatement))
? semanticModel.GetDeclaredSymbol(((LocalDeclarationStatementSyntax)statement).Declaration.Variables.First(), cancellationToken)
: semanticModel.GetSymbol(expression, cancellationToken);
int lastStatementIndex = IncludeAllReferencesOfSymbol(symbol, expression.Kind(), statements, statementIndex + 1, semanticModel, cancellationToken);
if (lastStatementIndex != -1)
{
if (lastStatementIndex < statements.Count - 1)
lastStatementIndex = IncludeAllReferencesOfVariablesDeclared(statements, statementIndex + 1, lastStatementIndex, semanticModel, cancellationToken);
return await RefactorAsync(
document,
expression,
statements,
container,
statementIndex,
lastStatementIndex,
cancellationToken).ConfigureAwait(false);
}
}
}
return await document.InsertNodeAfterAsync(statement, CreateNullCheck(expression), cancellationToken).ConfigureAwait(false);
}
private static bool NullCheckExists(ExpressionSyntax expression, StatementSyntax statement)
{
if (!EmbeddedStatement.IsEmbeddedStatement(statement))
{
StatementContainer container;
if (StatementContainer.TryCreate(statement, out container))
{
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(statement);
if (index < statements.Count - 1)
{
StatementSyntax nextStatement = statements[index + 1];
if (nextStatement.IsKind(SyntaxKind.IfStatement))
{
var ifStatement = (IfStatementSyntax)nextStatement;
ExpressionSyntax condition = ifStatement.Condition;
if (condition?.IsKind(SyntaxKind.NotEqualsExpression) == true)
{
var notEqualsExpression = (BinaryExpressionSyntax)condition;
ExpressionSyntax left = notEqualsExpression.Left;
if (left?.IsEquivalentTo(expression, topLevel: false) == true)
{
ExpressionSyntax right = notEqualsExpression.Right;
if (right?.IsKind(SyntaxKind.NullLiteralExpression) == true)
{
return(true);
}
}
}
}
}
}
}
return(false);
}
public async Task <Solution> InlineAndRemoveMethodAsync(
ExpressionStatementSyntax expressionStatement,
SyntaxList <StatementSyntax> statements)
{
if (expressionStatement.SyntaxTree == MethodDeclaration.SyntaxTree)
{
DocumentEditor editor = await DocumentEditor.CreateAsync(Document, CancellationToken).ConfigureAwait(false);
StatementSyntax[] newStatements = RewriteStatements(statements);
int count = statements.Count;
newStatements[0] = newStatements[0].WithLeadingTrivia(expressionStatement.GetLeadingTrivia());
newStatements[count - 1] = newStatements[count - 1].WithTrailingTrivia(expressionStatement.GetTrailingTrivia());
StatementContainer container;
if (StatementContainer.TryCreate(expressionStatement, out container))
{
SyntaxNode newNode = container.NodeWithStatements(container.Statements.ReplaceRange(expressionStatement, newStatements));
editor.ReplaceNode(container.Node, newNode);
}
else
{
editor.ReplaceNode(expressionStatement, Block(newStatements));
}
editor.RemoveNode(MethodDeclaration);
return(editor.GetChangedDocument().Solution());
}
else
{
Document newDocument = await InlineMethodAsync(expressionStatement, statements).ConfigureAwait(false);
DocumentId documentId = Document.Solution().GetDocumentId(MethodDeclaration.SyntaxTree);
newDocument = await newDocument.Solution().GetDocument(documentId).RemoveMemberAsync(MethodDeclaration, CancellationToken).ConfigureAwait(false);
return(newDocument.Solution());
}
}
public static void ComputeRefactoring(RefactoringContext context, ReturnStatementSyntax returnStatement)
{
ExpressionSyntax expression = returnStatement.Expression;
if (expression != null)
{
IStatementContainer container;
if (StatementContainer.TryCreate(returnStatement, out container))
{
SyntaxList <StatementSyntax> statements = container.Statements;
if (statements.Count > 1)
{
int index = statements.IndexOf(returnStatement);
if (index == statements.Count - 1)
{
StatementSyntax prevStatement = statements[index - 1];
if (prevStatement.IsKind(SyntaxKind.IfStatement))
{
var ifStatement = (IfStatementSyntax)prevStatement;
IfStatement ifElse = IfStatement.Create(ifStatement);
if (ifElse.EndsWithIf &&
ifElse
.Nodes
.Where(f => f.IsIf)
.All(f => IsLastStatementReturnStatement(f)))
{
context.RegisterRefactoring(
"Wrap in else",
cancellationToken => RefactorAsync(context.Document, ifStatement, returnStatement, container, cancellationToken));
}
}
}
}
}
}
}
public static void AnalyzeIfStatement(SyntaxNodeAnalysisContext context)
{
if (context.Node.ContainsDiagnostics)
{
return;
}
var ifStatement = (IfStatementSyntax)context.Node;
if (!ifStatement.IsSimpleIf())
{
StatementContainer container;
if (StatementContainer.TryCreate(ifStatement, out container))
{
int index = container.Statements.IndexOf(ifStatement);
ReturnStatementSyntax returnStatement = FindReturnStatementBelow(container.Statements, index);
if (returnStatement?.ContainsDiagnostics == false)
{
ExpressionSyntax expression = returnStatement.Expression;
if (expression != null &&
!ifStatement.SpanOrTrailingTriviaContainsDirectives() &&
!returnStatement.SpanOrLeadingTriviaContainsDirectives())
{
SemanticModel semanticModel = context.SemanticModel;
CancellationToken cancellationToken = context.CancellationToken;
ISymbol symbol = semanticModel.GetSymbol(expression, cancellationToken);
if (IsLocalDeclaredInScopeOrNonRefOrOutParameterOfEnclosingSymbol(symbol, container.Node, semanticModel, cancellationToken) &&
ifStatement
.GetChain()
.All(ifOrElse => IsSymbolAssignedInLastStatement(ifOrElse, symbol, semanticModel, cancellationToken)))
{
context.ReportDiagnostic(DiagnosticDescriptors.UseReturnInsteadOfAssignment, ifStatement);
}
}
}
}
}
}
private static void RegisterRefactoring(
RefactoringContext context,
StatementSyntax statement,
InitializerExpressionSyntax initializer,
ExpressionSyntax expression)
{
StatementContainer container;
if (StatementContainer.TryCreate(statement, out container))
{
context.RegisterRefactoring(
Title,
cancellationToken => RefactorAsync(
context.Document,
container,
statement,
initializer,
expression.WithoutTrivia(),
cancellationToken));
}
}
public Task <Document> InlineMethodAsync(
ExpressionStatementSyntax expressionStatement,
SyntaxList <StatementSyntax> statements)
{
int count = statements.Count;
StatementSyntax[] newStatements = RewriteStatements(statements);
newStatements[0] = newStatements[0].WithLeadingTrivia(expressionStatement.GetLeadingTrivia());
newStatements[count - 1] = newStatements[count - 1].WithTrailingTrivia(expressionStatement.GetTrailingTrivia());
if (StatementContainer.TryCreate(expressionStatement, out StatementContainer container))
{
SyntaxNode newNode = container.NodeWithStatements(container.Statements.ReplaceRange(expressionStatement, newStatements));
return(Document.ReplaceNodeAsync(container.Node, newNode, CancellationToken));
}
else
{
return(Document.ReplaceNodeAsync(expressionStatement, Block(newStatements), CancellationToken));
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveUnreachableCode))
{
return;
}
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out StatementSyntax statement))
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case CompilerDiagnosticIdentifiers.UnreachableCodeDetected:
{
Debug.Assert(context.Span.Start == statement.SpanStart, statement.ToString());
if (context.Span.Start != statement.SpanStart)
{
break;
}
CodeAction codeAction = CreateCodeActionForIfElse(context.Document, diagnostic, statement.Parent);
if (codeAction != null)
{
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
if (StatementContainer.TryCreate(statement, out StatementContainer container))
{
codeAction = CodeAction.Create(
Title,
cancellationToken =>
{
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(statement);
if (index == statements.Count - 1)
{
return(context.Document.RemoveStatementAsync(statement, cancellationToken));
}
else
{
SyntaxRemoveOptions removeOptions = RemoveHelper.DefaultRemoveOptions;
if (statement.GetLeadingTrivia().IsEmptyOrWhitespace())
{
removeOptions &= ~SyntaxRemoveOptions.KeepLeadingTrivia;
}
if (statements.Last().GetTrailingTrivia().IsEmptyOrWhitespace())
{
removeOptions &= ~SyntaxRemoveOptions.KeepTrailingTrivia;
}
return(context.Document.RemoveNodesAsync(statements.Skip(index), removeOptions, cancellationToken));
}
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
}
break;
}
}
}
}
public static async Task <Document> RefactorAsync(
Document document,
VariableDeclaratorSyntax declarator,
CancellationToken cancellationToken)
{
var declaration = (VariableDeclarationSyntax)declarator.Parent;
var localDeclaration = (LocalDeclarationStatementSyntax)declaration.Parent;
StatementContainer container;
if (StatementContainer.TryCreate(localDeclaration, out container))
{
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(localDeclaration);
StatementSyntax nextStatement = statements[index + 1];
var expressionStatement = (ExpressionStatementSyntax)nextStatement;
var assignment = (AssignmentExpressionSyntax)expressionStatement.Expression;
ExpressionSyntax right = assignment.Right;
EqualsValueClauseSyntax initializer = declarator.Initializer;
ExpressionSyntax value = initializer?.Value;
VariableDeclaratorSyntax newDeclarator = (value != null)
? declarator.ReplaceNode(value, right)
: declarator.WithInitializer(EqualsValueClause(right));
LocalDeclarationStatementSyntax newLocalDeclaration = localDeclaration.ReplaceNode(declarator, newDeclarator);
SyntaxTriviaList trailingTrivia = nextStatement.GetTrailingTrivia();
IEnumerable <SyntaxTrivia> trivia = container
.Node
.DescendantTrivia(TextSpan.FromBounds(localDeclaration.Span.End, right.SpanStart));
if (!trivia.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
newLocalDeclaration = newLocalDeclaration.WithTrailingTrivia(trivia.Concat(trailingTrivia));
}
else
{
newLocalDeclaration = newLocalDeclaration.WithTrailingTrivia(trailingTrivia);
}
SyntaxList <StatementSyntax> newStatements = statements
.Replace(localDeclaration, newLocalDeclaration)
.RemoveAt(index + 1);
return(await document.ReplaceNodeAsync(container.Node, container.NodeWithStatements(newStatements), cancellationToken).ConfigureAwait(false));
}
Debug.Assert(false, "");
return(document);
}
public static void ComputeRefactoring(RefactoringContext context, ExpressionSyntax expression)
{
SyntaxNode parent = expression.Parent;
if (parent != null)
{
SyntaxKind kind = parent.Kind();
if (kind == SyntaxKind.LogicalAndExpression ||
kind == SyntaxKind.LogicalOrExpression)
{
BinaryExpressionSyntax binaryExpression = GetCondition((BinaryExpressionSyntax)parent);
if (binaryExpression != null)
{
parent = binaryExpression.Parent;
switch (parent?.Kind())
{
case SyntaxKind.IfStatement:
{
if (kind == SyntaxKind.LogicalAndExpression)
{
var refactoring = new ExtractConditionFromIfToNestedIfRefactoring();
context.RegisterRefactoring(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, binaryExpression, expression, cancellationToken));
}
else if (kind == SyntaxKind.LogicalOrExpression)
{
StatementContainer container;
if (StatementContainer.TryCreate((StatementSyntax)parent, out container))
{
var refactoring = new ExtractConditionFromIfToIfRefactoring();
context.RegisterRefactoring(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, container, binaryExpression, expression, cancellationToken));
}
}
break;
}
case SyntaxKind.WhileStatement:
{
if (kind == SyntaxKind.LogicalAndExpression)
{
StatementContainer container;
if (StatementContainer.TryCreate((StatementSyntax)parent, out container))
{
var refactoring = new ExtractConditionFromWhileToNestedIfRefactoring();
context.RegisterRefactoring(
refactoring.Title,
cancellationToken => refactoring.RefactorAsync(context.Document, (WhileStatementSyntax)parent, binaryExpression, expression, cancellationToken));
}
}
break;
}
}
}
}
}
}
public static async Task <Document> RefactorAsync(
Document document,
StatementSyntax statement,
CancellationToken cancellationToken)
{
StatementContainer container;
if (StatementContainer.TryCreate(statement, out container))
{
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(statement);
StatementSyntax nextStatemnt = statements[index + 1];
switch (statement.Kind())
{
case SyntaxKind.IfStatement:
{
var ifStatement = (IfStatementSyntax)statement;
var expressionStatement = (ExpressionStatementSyntax)GetSingleStatementOrDefault(ifStatement.Statement);
var assignment = (AssignmentExpressionSyntax)expressionStatement.Expression;
ExpressionSyntax left = assignment.Left;
ExpressionSyntax right = assignment.Right;
BinaryExpressionSyntax coalesceExpression = CoalesceExpression(
left.WithoutLeadingTrivia().WithTrailingTrivia(Space),
right.WithLeadingTrivia(Space));
AssignmentExpressionSyntax newAssignment = assignment.WithRight(coalesceExpression.WithTriviaFrom(right));
ExpressionStatementSyntax newNode = expressionStatement.WithExpression(newAssignment);
IEnumerable <SyntaxTrivia> trivia = ifStatement.DescendantTrivia(TextSpan.FromBounds(ifStatement.SpanStart, expressionStatement.SpanStart));
if (trivia.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
newNode = newNode.WithLeadingTrivia(ifStatement.GetLeadingTrivia());
}
else
{
newNode = newNode
.WithLeadingTrivia(ifStatement.GetLeadingTrivia().Concat(trivia))
.WithFormatterAnnotation();
}
return(await document.ReplaceNodeAsync(ifStatement, newNode, cancellationToken).ConfigureAwait(false));
}
case SyntaxKind.ExpressionStatement:
{
var expressionStatement = (ExpressionStatementSyntax)statement;
var assignment = (AssignmentExpressionSyntax)expressionStatement.Expression;
return(await RefactorAsync(document, expressionStatement, (IfStatementSyntax)nextStatemnt, index, container, assignment.Right, cancellationToken).ConfigureAwait(false));
}
case SyntaxKind.LocalDeclarationStatement:
{
var localDeclaration = (LocalDeclarationStatementSyntax)statement;
ExpressionSyntax value = localDeclaration
.Declaration
.Variables
.First()
.Initializer
.Value;
return(await RefactorAsync(document, localDeclaration, (IfStatementSyntax)nextStatemnt, index, container, value, cancellationToken).ConfigureAwait(false));
}
}
}
Debug.Assert(false, statement.Kind().ToString());
return(document);
}
private static ReduceIfNestingAnalysis AnalyzeCore(
IfStatementSyntax ifStatement,
SemanticModel semanticModel,
SyntaxKind jumpKind,
ReduceIfNestingOptions options,
INamedTypeSymbol taskSymbol = null,
CancellationToken cancellationToken = default(CancellationToken))
{
if (!StatementContainer.TryCreate(ifStatement, out StatementContainer container))
{
return(Fail(ifStatement));
}
CSharpSyntaxNode node = container.Node;
SyntaxNode parent = node.Parent;
SyntaxKind parentKind = parent.Kind();
SyntaxList <StatementSyntax> statements = container.Statements;
if (container.IsSwitchSection ||
parentKind == SyntaxKind.SwitchSection)
{
SyntaxNode switchSection = (container.IsSwitchSection) ? node : parent;
if (!options.AllowSwitchSection())
{
return(Fail(switchSection));
}
if (ifStatement != statements.LastButOneOrDefault())
{
return(Fail(switchSection));
}
if (!IsFixableJumpStatement(statements.Last(), ref jumpKind))
{
return(Fail(switchSection));
}
if (!options.AllowNestedFix() &&
IsNestedFix(switchSection.Parent, semanticModel, options, taskSymbol, cancellationToken))
{
return(Fail(switchSection));
}
return(Success(jumpKind, switchSection));
}
if (parentKind.Is(
SyntaxKind.ForStatement,
SyntaxKind.ForEachStatement,
SyntaxKind.DoStatement,
SyntaxKind.WhileStatement))
{
if (!options.AllowLoop())
{
return(Fail(parent));
}
StatementSyntax lastStatement = statements.Last();
if (ifStatement == lastStatement)
{
jumpKind = SyntaxKind.ContinueStatement;
}
else
{
if (ifStatement != statements.LastButOneOrDefault())
{
return(Fail(parent));
}
if (!IsFixableJumpStatement(lastStatement, ref jumpKind))
{
return(Fail(parent));
}
}
if (!options.AllowNestedFix() &&
IsNestedFix(parent.Parent, semanticModel, options, taskSymbol, cancellationToken))
{
return(Fail(parent));
}
return(Success(jumpKind, parent));
}
if (!IsFixable(ifStatement, statements, ref jumpKind))
{
return(Fail(node));
}
switch (parentKind)
{
case SyntaxKind.ConstructorDeclaration:
case SyntaxKind.DestructorDeclaration:
case SyntaxKind.SetAccessorDeclaration:
case SyntaxKind.AddAccessorDeclaration:
case SyntaxKind.RemoveAccessorDeclaration:
{
if (jumpKind == SyntaxKind.None)
{
jumpKind = SyntaxKind.ReturnStatement;
}
else if (jumpKind != SyntaxKind.ReturnStatement)
{
return(Fail(parent));
}
return(Success(jumpKind, parent));
}
case SyntaxKind.OperatorDeclaration:
case SyntaxKind.ConversionOperatorDeclaration:
case SyntaxKind.GetAccessorDeclaration:
{
if (jumpKind == SyntaxKind.None)
{
return(Fail(parent));
}
return(Success(jumpKind, parent));
}
case SyntaxKind.MethodDeclaration:
{
var methodDeclaration = (MethodDeclarationSyntax)parent;
if (jumpKind != SyntaxKind.None)
{
return(Success(jumpKind, parent));
}
if (methodDeclaration.ReturnsVoid())
{
return(Success(SyntaxKind.ReturnStatement, parent));
}
if (methodDeclaration.Modifiers.Contains(SyntaxKind.AsyncKeyword) &&
taskSymbol != null &&
semanticModel
.GetDeclaredSymbol(methodDeclaration, cancellationToken)?
.ReturnType
.Equals(taskSymbol) == true)
{
return(Success(SyntaxKind.ReturnStatement, parent));
}
if (semanticModel
.GetDeclaredSymbol(methodDeclaration, cancellationToken)?
.ReturnType
.IsIEnumerableOrConstructedFromIEnumerableOfT() == true &&
methodDeclaration.ContainsYield())
{
return(Success(SyntaxKind.YieldBreakStatement, parent));
}
break;
}
case SyntaxKind.LocalFunctionStatement:
{
var localFunction = (LocalFunctionStatementSyntax)parent;
if (jumpKind != SyntaxKind.None)
{
return(Success(jumpKind, parent));
}
if (localFunction.ReturnsVoid())
{
return(Success(SyntaxKind.ReturnStatement, parent));
}
if (localFunction.Modifiers.Contains(SyntaxKind.AsyncKeyword) &&
taskSymbol != null &&
((IMethodSymbol)semanticModel.GetDeclaredSymbol(localFunction, cancellationToken))?
.ReturnType
.Equals(taskSymbol) == true)
{
return(Success(SyntaxKind.ReturnStatement, parent));
}
if (((IMethodSymbol)semanticModel.GetDeclaredSymbol(localFunction, cancellationToken))?
.ReturnType
.IsIEnumerableOrConstructedFromIEnumerableOfT() == true &&
localFunction.ContainsYield())
{
return(Success(SyntaxKind.YieldBreakStatement, parent));
}
break;
}
case SyntaxKind.AnonymousMethodExpression:
case SyntaxKind.SimpleLambdaExpression:
case SyntaxKind.ParenthesizedLambdaExpression:
{
var anonymousFunction = (AnonymousFunctionExpressionSyntax)parent;
if (jumpKind != SyntaxKind.None)
{
return(Success(jumpKind, parent));
}
var methodSymbol = semanticModel.GetSymbol(anonymousFunction, cancellationToken) as IMethodSymbol;
if (methodSymbol == null)
{
return(Fail(parent));
}
if (methodSymbol.ReturnsVoid)
{
return(Success(SyntaxKind.ReturnStatement, parent));
}
if (anonymousFunction.AsyncKeyword.IsKind(SyntaxKind.AsyncKeyword) &&
methodSymbol.ReturnType.Equals(taskSymbol))
{
return(Success(SyntaxKind.ReturnStatement, parent));
}
break;
}
case SyntaxKind.IfStatement:
{
ifStatement = (IfStatementSyntax)parent;
if (ifStatement.Parent is ElseClauseSyntax elseClause)
{
if (ifStatement.Else != null)
{
return(Fail(parent));
}
if (!options.AllowIfInsideIfElse())
{
return(Fail(parent));
}
return(AnalyzeCore(ifStatement.GetTopmostIf(), semanticModel, jumpKind, options, taskSymbol, cancellationToken));
}
else
{
if (!IsFixable(ifStatement))
{
return(Fail(parent));
}
if (!options.AllowNestedFix())
{
return(Fail(parent));
}
return(AnalyzeCore(ifStatement, semanticModel, jumpKind, options, taskSymbol, cancellationToken));
}
}
case SyntaxKind.ElseClause:
{
if (!options.AllowIfInsideIfElse())
{
return(Fail(parent));
}
var elseClause = (ElseClauseSyntax)parent;
return(AnalyzeCore(elseClause.GetTopmostIf(), semanticModel, jumpKind, options, taskSymbol, cancellationToken));
}
}
return(Fail(parent));
}
public static void Analyze(SyntaxNodeAnalysisContext context, IfStatementSyntax ifStatement)
{
if (!StatementContainer.TryCreate(ifStatement, out StatementContainer container))
{
return;
}
ReturnStatementSyntax returnStatement = GetReturnStatement(ifStatement.Statement);
LiteralExpressionSyntax booleanLiteral = GetBooleanLiteral(returnStatement);
if (booleanLiteral == null)
{
return;
}
ReturnStatementSyntax returnStatement2 = null;
LiteralExpressionSyntax booleanLiteral2 = null;
TextSpan span = ifStatement.Span;
ElseClauseSyntax elseClause = ifStatement.Else;
if (elseClause != null)
{
returnStatement2 = GetReturnStatement(elseClause.Statement);
booleanLiteral2 = GetBooleanLiteral(returnStatement2);
if (booleanLiteral2 == null)
{
return;
}
}
else
{
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(ifStatement);
if (index == statements.Count - 1)
{
return;
}
if (index > 0 &&
((statements[index - 1] is IfStatementSyntax ifStatement2) &&
ifStatement2.Else == null &&
GetBooleanLiteral(ifStatement2.Statement) != null))
{
return;
}
StatementSyntax nextStatement = statements[index + 1];
if (nextStatement.Kind() != SyntaxKind.ReturnStatement)
{
return;
}
returnStatement2 = (ReturnStatementSyntax)nextStatement;
booleanLiteral2 = GetBooleanLiteral(returnStatement2);
if (booleanLiteral2 == null)
{
return;
}
span = TextSpan.FromBounds(ifStatement.SpanStart, returnStatement2.Span.End);
}
if (booleanLiteral.Kind() == booleanLiteral2.Kind())
{
return;
}
if (!container.Node
.DescendantTrivia(span)
.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
return;
}
context.ReportDiagnostic(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatement, ifStatement.IfKeyword);
context.ReportToken(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatementFadeOut, ifStatement.IfKeyword);
context.ReportToken(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatementFadeOut, ifStatement.OpenParenToken);
context.ReportToken(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatementFadeOut, ifStatement.CloseParenToken);
context.ReportNode(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatementFadeOut, ifStatement.Statement);
if (elseClause != null)
{
context.ReportNode(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatementFadeOut, elseClause);
}
else
{
context.ReportNode(DiagnosticDescriptors.ReplaceIfStatementWithReturnStatementFadeOut, returnStatement2);
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsAnyCodeFixEnabled(
CodeFixIdentifiers.RemoveUnreachableCode,
CodeFixIdentifiers.RemoveEmptySwitchStatement,
CodeFixIdentifiers.IntroduceLocalVariable,
CodeFixIdentifiers.RemoveJumpStatement))
{
return;
}
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out StatementSyntax statement))
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case CompilerDiagnosticIdentifiers.UnreachableCodeDetected:
{
if (context.Span.Start == statement.SpanStart)
{
StatementContainer container;
if (StatementContainer.TryCreate(statement, out container))
{
CodeAction codeAction = CodeAction.Create(
"Remove unreachable code",
cancellationToken =>
{
SyntaxList <StatementSyntax> statements = container.Statements;
int index = statements.IndexOf(statement);
if (index == statements.Count - 1)
{
return(context.Document.RemoveStatementAsync(statement, context.CancellationToken));
}
else
{
SyntaxRemoveOptions removeOptions = RemoveHelper.DefaultRemoveOptions;
if (statement.GetLeadingTrivia().IsEmptyOrWhitespace())
{
removeOptions &= ~SyntaxRemoveOptions.KeepLeadingTrivia;
}
if (statements.Last().GetTrailingTrivia().IsEmptyOrWhitespace())
{
removeOptions &= ~SyntaxRemoveOptions.KeepTrailingTrivia;
}
return(context.Document.RemoveNodesAsync(statements.Skip(index), removeOptions, context.CancellationToken));
}
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
}
}
break;
}
case CompilerDiagnosticIdentifiers.EmptySwitchBlock:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveEmptySwitchStatement))
{
break;
}
if (!statement.IsKind(SyntaxKind.SwitchStatement))
{
break;
}
var switchStatement = (SwitchStatementSyntax)statement;
CodeAction codeAction = CodeAction.Create(
"Remove switch statement",
cancellationToken => context.Document.RemoveStatementAsync(switchStatement, cancellationToken),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case CompilerDiagnosticIdentifiers.OnlyAssignmentCallIncrementDecrementAndNewObjectExpressionsCanBeUsedAsStatement:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.IntroduceLocalVariable))
{
break;
}
if (!statement.IsKind(SyntaxKind.ExpressionStatement))
{
break;
}
var expressionStatement = (ExpressionStatementSyntax)statement;
ExpressionSyntax expression = expressionStatement.Expression;
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
if (semanticModel.GetSymbol(expression, context.CancellationToken)?.IsErrorType() == false)
{
ITypeSymbol typeSymbol = semanticModel.GetTypeSymbol(expression, context.CancellationToken);
if (typeSymbol?.IsErrorType() == false)
{
bool addAwait = typeSymbol.IsConstructedFromTaskOfT(semanticModel) &&
semanticModel.GetEnclosingSymbol(expressionStatement.SpanStart, context.CancellationToken).IsAsyncMethod();
CodeAction codeAction = CodeAction.Create(
IntroduceLocalVariableRefactoring.GetTitle(expression),
cancellationToken => IntroduceLocalVariableRefactoring.RefactorAsync(context.Document, expressionStatement, typeSymbol, addAwait, semanticModel, cancellationToken),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
}
}
break;
}
case CompilerDiagnosticIdentifiers.NoEnclosingLoopOutOfWhichToBreakOrContinue:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveJumpStatement))
{
break;
}
CodeAction codeAction = CodeAction.Create(
$"Remove {statement.GetTitle()}",
cancellationToken => context.Document.RemoveStatementAsync(statement, cancellationToken),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}