private static IndexerDeclarationSyntax UseExpressionBodyIfDesired(
Workspace workspace, IndexerDeclarationSyntax declaration, ParseOptions options)
{
if (declaration.ExpressionBody == null)
{
var preferExpressionBody = workspace.Options.GetOption(CSharpCodeStyleOptions.PreferExpressionBodiedIndexers).Value;
if (preferExpressionBody)
{
var expressionBody = TryGetExpressionBody(declaration.AccessorList, options);
if (expressionBody != null)
{
declaration = declaration.WithAccessorList(null)
.WithExpressionBody(expressionBody)
.WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken));
}
}
}
return declaration;
}
/// <summary>
/// Normalizes the <paramref name="declaration" />.
/// </summary>
public override SyntaxNode VisitIndexerDeclaration(IndexerDeclarationSyntax declaration)
{
// Nothing to do here for properties without expression bodies
if (declaration.ExpressionBody == null)
return declaration;
// Nothing to do here for indexers not defined in fault effects or for indexers that are no overrides of some port
var propertySymbol = declaration.GetPropertySymbol(SemanticModel);
if (!propertySymbol.ContainingType.IsFaultEffect(SemanticModel) || !propertySymbol.IsOverride)
return declaration;
var originalDeclaration = declaration;
var statements = AsStatementBody(propertySymbol.GetMethod, declaration.ExpressionBody.Expression);
var getter = SyntaxFactory.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration, statements);
var accessorList = SyntaxFactory.AccessorList(SyntaxFactory.SingletonList(getter));
declaration = declaration.WithAccessorList(accessorList);
declaration = declaration.WithExpressionBody(null).WithSemicolonToken(default(SyntaxToken));
return declaration.EnsureLineCount(originalDeclaration);
}
private async Task<Document> HandleIndexerDeclaration(IndexerDeclarationSyntax declaration, Document document, CancellationToken cancellationToken)
{
var returnStatement = SyntaxFactory.ReturnStatement(
returnKeyword: SyntaxFactory.Token(SyntaxKind.ReturnKeyword),
expression: declaration.ExpressionBody.Expression,
semicolonToken: declaration.SemicolonToken);
var accessorDeclaration = SyntaxFactory.AccessorDeclaration(
kind: SyntaxKind.GetAccessorDeclaration,
body: SyntaxFactory.Block(returnStatement));
var newDeclaration = declaration
.WithAccessorList(
SyntaxFactory.AccessorList(
SyntaxFactory.SingletonList(accessorDeclaration)))
.WithExpressionBody(null)
.WithSemicolonToken(default(SyntaxToken))
.WithAdditionalAnnotations(Formatter.Annotation);
var oldRoot = await document.GetSyntaxRootAsync(cancellationToken);
var newRoot = oldRoot.ReplaceNode(declaration, newDeclaration);
return document.WithSyntaxRoot(newRoot);
}
