private static async Task <StatementsInfo> RefactorAsync(
Document document,
StatementsInfo statementsInfo,
StatementSyntax statement,
StatementSyntax newStatement,
int index,
int count,
bool removeReturnStatement,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
ReturnStatementSyntax returnStatement = FindReturnStatementBelow(statementsInfo.Statements, index);
ExpressionSyntax expression = returnStatement.Expression;
ExpressionSyntax newExpression = null;
ISymbol symbol = semanticModel.GetSymbol(expression, cancellationToken);
if (symbol.IsLocal() &&
index > 0)
{
LocalDeclarationStatementSyntax localDeclarationStatement = FindLocalDeclarationStatementAbove(statementsInfo.Statements, index);
if (localDeclarationStatement?.ContainsDiagnostics == false &&
!localDeclarationStatement.SpanOrTrailingTriviaContainsDirectives() &&
!statement.GetLeadingTrivia().Any(f => f.IsDirective))
{
SeparatedSyntaxList <VariableDeclaratorSyntax> declarators = localDeclarationStatement.Declaration.Variables;
VariableDeclaratorSyntax declarator = FindVariableDeclarator(semanticModel, symbol, declarators, cancellationToken);
if (declarator != null)
{
ExpressionSyntax value = declarator.Initializer?.Value;
if (removeReturnStatement || value != null)
{
IEnumerable <ReferencedSymbol> referencedSymbols = await SymbolFinder.FindReferencesAsync(symbol, document.Solution(), cancellationToken).ConfigureAwait(false);
if (referencedSymbols.First().Locations.Count() == count + 1)
{
newExpression = value;
if (declarators.Count == 1)
{
statementsInfo = statementsInfo.RemoveNode(localDeclarationStatement, RemoveHelper.GetRemoveOptions(localDeclarationStatement));
index--;
}
else
{
statementsInfo = statementsInfo.ReplaceNode(localDeclarationStatement, localDeclarationStatement.RemoveNode(declarator, RemoveHelper.GetRemoveOptions(declarator)));
}
returnStatement = FindReturnStatementBelow(statementsInfo.Statements, index);
}
}
}
}
}
if (removeReturnStatement)
{
statementsInfo = statementsInfo.RemoveNode(returnStatement, RemoveHelper.GetRemoveOptions(returnStatement));
}
else if (newExpression != null)
{
statementsInfo = statementsInfo.ReplaceNode(returnStatement, returnStatement.WithExpression(newExpression.WithTriviaFrom(expression)));
}
return(statementsInfo.ReplaceNode(statementsInfo.Statements[index], newStatement));
}
