private static Task <Document> RefactorAsync(
Document document,
SyntaxNode declaration,
ITypeSymbol typeSymbol,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
BlockSyntax body = GetBody();
SyntaxList <StatementSyntax> statements = body.Statements;
int position = statements[0].SpanStart;
string name = NameGenerator.Default.EnsureUniqueLocalName("items", semanticModel, position);
IdentifierNameSyntax identifierName = IdentifierName(name);
TypeSyntax listType = semanticModel
.GetTypeByMetadataName("System.Collections.Generic.List`1")
.Construct(typeSymbol)
.ToMinimalTypeSyntax(semanticModel, position);
LocalDeclarationStatementSyntax localDeclarationStatement = LocalDeclarationStatement(
VarType(),
name,
EqualsValueClause(ObjectCreationExpression(listType, ArgumentList())));
localDeclarationStatement = localDeclarationStatement.WithFormatterAnnotation();
SyntaxList <StatementSyntax> newStatements = InsertLocalDeclarationStatement(statements, localDeclarationStatement);
ReturnStatementSyntax returnStatement = ReturnStatement(identifierName).WithFormatterAnnotation();
newStatements = InsertReturnStatement(newStatements, returnStatement);
BlockSyntax newBlock = body.WithStatements(newStatements);
var rewriter = new YieldRewriter(identifierName, typeSymbol, semanticModel);
newBlock = (BlockSyntax)rewriter.Visit(newBlock);
return(document.ReplaceNodeAsync(body, newBlock, cancellationToken));
BlockSyntax GetBody()
{
switch (declaration)
{
case MethodDeclarationSyntax methodDeclaration:
return(methodDeclaration.Body);
case LocalFunctionStatementSyntax localFunction:
return(localFunction.Body);
case AccessorDeclarationSyntax accessorDeclaration:
return(accessorDeclaration.Body);
}
throw new InvalidOperationException();
}
}
private static async Task <Document> RefactorAsync(
Document document,
YieldStatementSyntax yieldStatement,
BlockSyntax block,
SyntaxList <StatementSyntax> statements,
CancellationToken cancellationToken)
{
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
int position = statements[0].SpanStart;
string name = NameGenerator.Default.EnsureUniqueLocalName("items", semanticModel, position);
IdentifierNameSyntax identifierName = IdentifierName(name);
ITypeSymbol typeSymbol = semanticModel.GetTypeSymbol(yieldStatement.Expression, cancellationToken);
TypeSyntax listType = semanticModel
.GetTypeByMetadataName(MetadataNames.System_Collections_Generic_List_T)
.Construct(typeSymbol)
.ToMinimalTypeSyntax(semanticModel, position);
LocalDeclarationStatementSyntax localDeclarationStatement = LocalDeclarationStatement(
VarType(),
name,
EqualsValueClause(ObjectCreationExpression(listType, ArgumentList())));
localDeclarationStatement = localDeclarationStatement.WithFormatterAnnotation();
SyntaxList <StatementSyntax> newStatements = InsertLocalDeclarationStatement(statements, localDeclarationStatement);
ReturnStatementSyntax returnStatement = ReturnStatement(identifierName).WithFormatterAnnotation();
newStatements = InsertReturnStatement(newStatements, returnStatement);
BlockSyntax newBlock = block.WithStatements(newStatements);
var rewriter = new YieldRewriter(identifierName, typeSymbol, semanticModel);
newBlock = (BlockSyntax)rewriter.Visit(newBlock);
return(await document.ReplaceNodeAsync(block, newBlock, cancellationToken).ConfigureAwait(false));
}
