public static Task <Document> RefactorAsync(
Document document,
ReturnStatementSyntax returnStatement,
SyntaxKind replacementKind,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
SyntaxToken returnKeyword = returnStatement.ReturnKeyword;
ExpressionSyntax expression = returnStatement.Expression;
switch (replacementKind)
{
case SyntaxKind.YieldReturnStatement:
{
YieldStatementSyntax yieldReturnStatement = YieldStatement(
SyntaxKind.YieldReturnStatement,
Token(returnKeyword.LeadingTrivia, SyntaxKind.YieldKeyword, TriviaList(Space)),
returnKeyword.WithoutLeadingTrivia(),
expression,
returnStatement.SemicolonToken);
return(document.ReplaceNodeAsync(returnStatement, yieldReturnStatement, cancellationToken));
}
case SyntaxKind.ForEachStatement:
{
string name = NameGenerator.Default.EnsureUniqueLocalName(
DefaultNames.ForEachVariable,
semanticModel,
returnStatement.SpanStart,
cancellationToken: cancellationToken);
YieldStatementSyntax yieldReturnStatement = YieldStatement(
SyntaxKind.YieldReturnStatement,
Token(default(SyntaxTriviaList), SyntaxKind.YieldKeyword, TriviaList(Space)),
returnKeyword.WithoutLeadingTrivia(),
IdentifierName(name),
returnStatement.SemicolonToken.WithoutTrailingTrivia());
StatementSyntax newNode = ForEachStatement(
VarType(),
name,
expression,
Block(yieldReturnStatement));
if (returnStatement.IsEmbedded())
{
newNode = Block(newNode);
}
newNode = newNode.WithTriviaFrom(returnStatement);
return(document.ReplaceNodeAsync(returnStatement, newNode, cancellationToken));
}
default:
{
Debug.Fail("");
return(Task.FromResult(document));
}
}
}