public override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
var document = context.Document;
if (document.Project.Solution.Workspace.Kind == WorkspaceKind.MiscellaneousFiles)
{
return;
}
var span = context.Span;
if (!span.IsEmpty)
{
return;
}
var cancellationToken = context.CancellationToken;
if (cancellationToken.IsCancellationRequested)
{
return;
}
var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (model.IsFromGeneratedCode(cancellationToken))
{
return;
}
var root = await model.SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
var syntaxNode = root.FindNode(span);
var returnStatement = syntaxNode as ReturnStatementSyntax;
if (returnStatement != null)
{
if (!(returnStatement.Expression is ConditionalExpressionSyntax) && !(returnStatement.Expression is BinaryExpressionSyntax))
{
return;
}
if (returnStatement.Expression is BinaryExpressionSyntax && !returnStatement.Expression.IsKind(SyntaxKind.CoalesceExpression))
{
return;
}
context.RegisterRefactoring(
CodeActionFactory.Create(
span,
DiagnosticSeverity.Info,
GettextCatalog.GetString("Replace with 'if' statement"),
t2 =>
{
StatementSyntax statement = null;
ReturnStatementSyntax returnAfter = null;
if (returnStatement.Expression is ConditionalExpressionSyntax)
{
var condition = (ConditionalExpressionSyntax)returnStatement.Expression;
statement = SyntaxFactory.IfStatement(condition.Condition, SyntaxFactory.ReturnStatement(condition.WhenTrue));
returnAfter = SyntaxFactory.ReturnStatement(condition.WhenFalse);
}
else
{
var bOp = returnStatement.Expression as BinaryExpressionSyntax;
if (bOp != null && bOp.IsKind(SyntaxKind.CoalesceExpression))
{
statement = SyntaxFactory.IfStatement(SyntaxFactory.BinaryExpression(SyntaxKind.NotEqualsExpression, bOp.Left, SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)), SyntaxFactory.ReturnStatement(bOp.Left));
returnAfter = SyntaxFactory.ReturnStatement(bOp.Right);
}
}
var newRoot = root.ReplaceNode((SyntaxNode)returnStatement, new SyntaxNode[] {
statement.WithAdditionalAnnotations(Formatter.Annotation).WithLeadingTrivia(returnStatement.GetLeadingTrivia()),
returnAfter.WithAdditionalAnnotations(Formatter.Annotation)
});
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
)
);
}
var assignExpr = syntaxNode as AssignmentExpressionSyntax;
if (assignExpr != null)
{
if (assignExpr.Right.IsKind(SyntaxKind.ConditionalExpression))
{
context.RegisterRefactoring(
CodeActionFactory.Create(
span,
DiagnosticSeverity.Info,
GettextCatalog.GetString("Replace with 'if' statement"),
t2 =>
{
var ifStatement = CreateForConditionalExpression(assignExpr, (ConditionalExpressionSyntax)assignExpr.Right);
return(Task.FromResult(document.WithSyntaxRoot(root.ReplaceNode((SyntaxNode)assignExpr.Parent, ifStatement.WithAdditionalAnnotations(Formatter.Annotation)))));
}
)
);
}
if (assignExpr.Right.IsKind(SyntaxKind.CoalesceExpression))
{
context.RegisterRefactoring(
CodeActionFactory.Create(
span,
DiagnosticSeverity.Info,
GettextCatalog.GetString("Replace with 'if' statement"),
t2 =>
{
var ifStatement = CreateForNullCoalescingExpression(assignExpr, (BinaryExpressionSyntax)assignExpr.Right);
return(Task.FromResult(document.WithSyntaxRoot(root.ReplaceNode((SyntaxNode)assignExpr.Parent, ifStatement.WithAdditionalAnnotations(Formatter.Annotation)))));
}
)
);
}
}
}