private static async Task <Document> RefactorAsync(
Document document,
StatementSyntax statement,
CancellationToken cancellationToken)
{
StatementListInfo statementsInfo = SyntaxInfo.StatementListInfo(statement);
var methodDeclaration = (MethodDeclarationSyntax)statementsInfo.Parent.Parent;
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
string name = methodDeclaration.Identifier.ValueText;
name = NameGenerator.Default.EnsureUniqueLocalName(name, semanticModel, statement.SpanStart, cancellationToken: cancellationToken);
SyntaxList <StatementSyntax> statements = statementsInfo.Statements;
int index = statements.IndexOf(statement);
List <StatementSyntax> localFunctionStatements = statements.Skip(index).ToList();
int lastIndex = localFunctionStatements.Count - 1;
localFunctionStatements[0] = localFunctionStatements[0].TrimLeadingTrivia();
LocalFunctionStatementSyntax localFunction = LocalFunctionStatement(
default(SyntaxTokenList),
methodDeclaration.ReturnType.WithoutTrivia(),
Identifier(name).WithRenameAnnotation(),
ParameterList(),
Block(localFunctionStatements));
ReturnStatementSyntax returnStatement = ReturnStatement(
Token(TriviaList(NewLine()), SyntaxKind.ReturnKeyword, TriviaList()),
InvocationExpression(IdentifierName(name)),
Token(SyntaxTriviaList.Empty, SyntaxKind.SemicolonToken, TriviaList(NewLine(), NewLine())));
SyntaxList <StatementSyntax> newStatements = statements.ReplaceRange(
index,
statements.Count - index,
new StatementSyntax[] { returnStatement.WithFormatterAnnotation(), localFunction.WithFormatterAnnotation() });
return(await document.ReplaceStatementsAsync(statementsInfo, newStatements, cancellationToken).ConfigureAwait(false));
}
