public SyntaxNode TransformFunctionReference(SyntaxNode node, IFunctionAnalyzationResult funcResult,
IFunctionReferenceAnalyzationResult funcReferenceResult, INamespaceTransformationMetadata namespaceMetadata)
{
if (funcReferenceResult is IBodyFunctionReferenceAnalyzationResult bodyFunctionReference &&
(bodyFunctionReference.PassCancellationToken || funcResult.GetMethodOrAccessor().AddCancellationTokenGuards))
{
// Mark the invocation node in order to add the OperationCanceledException catch block only if there is at least one async invocation
// with a cancellation token passed as an argument or there will be a cancellation token guard added
return(node.WithAdditionalAnnotations(new SyntaxAnnotation(Annotations.AsyncCallWithTokenOrGuard)));
}
return(null);
}
private T TransformFunctionReference <T>(T node, IFunctionAnalyzationResult funcResult, FunctionReferenceTransformationResult transfromReference,
ITypeTransformationMetadata typeMetadata,
INamespaceTransformationMetadata namespaceMetadata)
where T : SyntaxNode
{
var nameNode = node.GetAnnotatedNodes(transfromReference.Annotation).OfType <SimpleNameSyntax>().First();
var funReferenceResult = transfromReference.AnalyzationResult;
var bodyFuncReferenceResult = funReferenceResult as IBodyFunctionReferenceAnalyzationResult;
var newNameNode = nameNode
.WithIdentifier(Identifier(funReferenceResult.AsyncCounterpartName))
.WithTriviaFrom(nameNode);
transfromReference.Transformed = newNameNode;
var cancellationTokenParamName = funcResult.GetMethodOrAccessor().CancellationTokenRequired ? "cancellationToken" : null; // TODO: remove
// If we have a cref change the name to the async counterpart and add/update arguments
if (bodyFuncReferenceResult == null)
{
if (funReferenceResult.IsCref)
{
var crefNode = (NameMemberCrefSyntax)nameNode.Parent;
var paramList = new List <CrefParameterSyntax>();
// If the cref has already the parameters set then use them
if (crefNode.Parameters != null)
{
paramList.AddRange(crefNode.Parameters.Parameters);
// If the external async counterpart has a cancellation token, add it
if (funReferenceResult.AsyncCounterpartFunction == null &&
funReferenceResult.ReferenceSymbol.Parameters.Length <
funReferenceResult.AsyncCounterpartSymbol.Parameters.Length)
{
paramList.Add(CrefParameter(IdentifierName(nameof(CancellationToken))));
}
}
else
{
// We have to add the parameters to avoid ambiguity
var asyncSymbol = funReferenceResult.AsyncCounterpartSymbol;
paramList.AddRange(asyncSymbol.Parameters
.Select(o => CrefParameter(o.Type
.CreateTypeSyntax(true, namespaceMetadata.AnalyzationResult.IsIncluded(o.Type.ContainingNamespace?.ToString())))));
}
// If the async counterpart is internal and a token is required add a token parameter
if (funReferenceResult.AsyncCounterpartFunction?.GetMethodOrAccessor()?.CancellationTokenRequired == true)
{
paramList.Add(CrefParameter(IdentifierName(nameof(CancellationToken))));
}
node = node.ReplaceNestedNodes(
crefNode.Parent as QualifiedCrefSyntax,
crefNode,
crefNode
.ReplaceNode(nameNode, newNameNode)
.WithParameters(CrefParameterList(SeparatedList(paramList))),
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithContainer(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(rootNode.Container))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
else if (funReferenceResult.IsNameOf)
{
node = node.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName).WithTriviaFrom(rootNode.Expression))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
return(node);
}
// If we have a method passed as an argument we need to check if we have to wrap it inside a function
if (bodyFuncReferenceResult.AsyncDelegateArgument != null)
{
if (bodyFuncReferenceResult.WrapInsideFunction)
{
// TODO: move to analyze step
var argumentNode = nameNode.Ancestors().OfType <ArgumentSyntax>().First();
var delReturnType = (INamedTypeSymbol)bodyFuncReferenceResult.AsyncDelegateArgument.ReturnType;
var returnType = bodyFuncReferenceResult.AsyncCounterpartSymbol.ReturnType;
bool returnTypeMismatch;
if (bodyFuncReferenceResult.ReferenceFunction != null)
{
var refMethod = bodyFuncReferenceResult.ReferenceFunction as IMethodAnalyzationResult;
if (refMethod != null && refMethod.PreserveReturnType)
{
returnTypeMismatch = !delReturnType.Equals(returnType); // TODO Generics
}
else if (delReturnType.IsGenericType) // Generic Task
{
returnTypeMismatch = delReturnType.TypeArguments.First().IsAwaitRequired(returnType);
}
else
{
returnTypeMismatch = delReturnType.IsAwaitRequired(returnType);
}
}
else
{
returnTypeMismatch = !delReturnType.Equals(returnType); // TODO Generics
}
var newArgumentExpression = argumentNode.Expression
.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
)
.WrapInsideFunction(bodyFuncReferenceResult.AsyncDelegateArgument, returnTypeMismatch,
namespaceMetadata.TaskConflict,
invocation => invocation.AddCancellationTokenArgumentIf(cancellationTokenParamName, bodyFuncReferenceResult));
node = node
.ReplaceNode(argumentNode.Expression, newArgumentExpression);
}
else
{
node = node.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
return(node);
}
InvocationExpressionSyntax invokeNode = null;
var isAccessor = bodyFuncReferenceResult.ReferenceSymbol.IsAccessor();
if (!isAccessor && funReferenceResult.ReferenceNode.IsKind(SyntaxKind.InvocationExpression))
{
invokeNode = nameNode.Ancestors().OfType <InvocationExpressionSyntax>().First();
}
if (!bodyFuncReferenceResult.AwaitInvocation)
{
// An arrow method does not have a statement
var statement = nameNode.Ancestors().OfType <StatementSyntax>().FirstOrDefault();
var statementInParentFunction = nameNode.Ancestors().TakeWhile(o => !o.Equals(statement)).Any(o => o.IsFunction());
var newNode = (SyntaxNode)statement ?? node;
if (invokeNode != null)
{
newNode = newNode.ReplaceNestedNodes(
invokeNode,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode
.AddCancellationTokenArgumentIf(cancellationTokenParamName, bodyFuncReferenceResult),
funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression)))
);
}
else if (isAccessor)
{
newNode = ConvertAccessor(newNode, nameNode, newNameNode, cancellationTokenParamName, bodyFuncReferenceResult,
invNode => UpdateTypeAndRunReferenceTransformers(invNode, funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression))));
}
else
{
newNode = newNode.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName).WithTriviaFrom(rootNode.Expression))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
if (statement != null && !statement.IsKind(SyntaxKind.LocalFunctionStatement))
{
// Skip adding return statement for arrow functions
if (bodyFuncReferenceResult.UseAsReturnValue && !statementInParentFunction)
{
newNode = ((StatementSyntax)newNode).ToReturnStatement();
}
node = node
.ReplaceNode(statement, newNode);
}
else
{
node = (T)newNode;
}
}
else
{
// We need to annotate the invocation node because of the AddAwait method as it needs the parent node
var invokeAnnotation = Guid.NewGuid().ToString();
if (isAccessor)
{
node = ConvertAccessor(node, nameNode, newNameNode, cancellationTokenParamName, bodyFuncReferenceResult, invNode =>
UpdateTypeAndRunReferenceTransformers(invNode, funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression)))
.WithAdditionalAnnotations(new SyntaxAnnotation(invokeAnnotation))
);
}
else
{
node = node.ReplaceNestedNodes(
invokeNode,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode
.AddCancellationTokenArgumentIf(cancellationTokenParamName, bodyFuncReferenceResult),
funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression)))
.WithAdditionalAnnotations(new SyntaxAnnotation(invokeAnnotation))
);
}
invokeNode = node.GetAnnotatedNodes(invokeAnnotation).OfType <InvocationExpressionSyntax>().First();
// Check if the invocation has a ?.
var conditionalAccessNode = invokeNode.Ancestors()
.TakeWhile(o => !(o is StatementSyntax))
.OfType <ConditionalAccessExpressionSyntax>()
.FirstOrDefault(o => o.WhenNotNull.Contains(invokeNode));
if (conditionalAccessNode != null) // ?. syntax
{
// We have to find out which strategy to use, if we have a non assignable expression, we are force to use if statements
// otherwise a ternary condition will be used
if (!conditionalAccessNode.Parent.IsKind(SyntaxKind.ExpressionStatement) || !invokeNode.Equals(conditionalAccessNode.WhenNotNull))
{
node = TransformConditionalAccessToConditionalExpressions(node, nameNode, funReferenceResult, typeMetadata,
conditionalAccessNode, invokeNode);
}
else
{
node = TransformConditionalAccessToIfStatements(node, nameNode, typeMetadata, conditionalAccessNode, invokeNode);
}
}
else
{
node = node.ReplaceNode(invokeNode, invokeNode.AddAwait(_configuration.ConfigureAwaitArgument));
}
}
return(node);
}
private T TransformFunctionReference <T>(T node, IFunctionAnalyzationResult funcResult, FunctionReferenceTransformationResult transfromReference,
ITypeTransformationMetadata typeMetadata,
INamespaceTransformationMetadata namespaceMetadata)
where T : SyntaxNode
{
var nameNode = node.GetAnnotatedNodes(transfromReference.Annotation).OfType <SimpleNameSyntax>().First();
var funReferenceResult = transfromReference.AnalyzationResult;
var bodyFuncReferenceResult = funReferenceResult as IBodyFunctionReferenceAnalyzationResult;
var newNameNode = nameNode
.WithIdentifier(Identifier(funReferenceResult.AsyncCounterpartName))
.WithTriviaFrom(nameNode);
transfromReference.Transformed = newNameNode;
var cancellationTokenParamName = funcResult.GetMethodOrAccessor().CancellationTokenRequired ? "cancellationToken" : null; // TODO: remove
// If we have a cref change the name to the async counterpart and add/update arguments
if (bodyFuncReferenceResult == null)
{
if (funReferenceResult.IsCref)
{
var crefNode = (NameMemberCrefSyntax)nameNode.Parent;
var paramList = new List <CrefParameterSyntax>();
// If the cref has already the parameters set then use them
if (crefNode.Parameters != null)
{
paramList.AddRange(crefNode.Parameters.Parameters);
// If the external async counterpart has a cancellation token, add it
if (funReferenceResult.AsyncCounterpartFunction == null &&
funReferenceResult.ReferenceSymbol.Parameters.Length <
funReferenceResult.AsyncCounterpartSymbol.Parameters.Length)
{
paramList.Add(CrefParameter(IdentifierName(nameof(CancellationToken))));
}
}
else
{
// We have to add the parameters to avoid ambiguity
var asyncSymbol = funReferenceResult.AsyncCounterpartSymbol;
paramList.AddRange(asyncSymbol.Parameters
.Select(o => CrefParameter(o.Type
.CreateTypeSyntax(true, namespaceMetadata.AnalyzationResult.IsIncluded(o.Type.ContainingNamespace?.ToString())))));
}
// If the async counterpart is internal and a token is required add a token parameter
if (funReferenceResult.AsyncCounterpartFunction?.GetMethodOrAccessor()?.CancellationTokenRequired == true)
{
paramList.Add(CrefParameter(IdentifierName(nameof(CancellationToken))));
}
node = node.ReplaceNestedNodes(
crefNode.Parent as QualifiedCrefSyntax,
crefNode,
crefNode
.ReplaceNode(nameNode, newNameNode)
.WithParameters(CrefParameterList(SeparatedList(paramList))),
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithContainer(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(rootNode.Container))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
else if (funReferenceResult.IsNameOf)
{
node = node.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName).WithTriviaFrom(rootNode.Expression))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
return(node);
}
// If we have a method passed as an argument we need to check if we have to wrap it inside a function
if (bodyFuncReferenceResult.AsyncDelegateArgument != null)
{
if (bodyFuncReferenceResult.WrapInsideFunction)
{
// TODO: move to analyze step
var argumentNode = nameNode.Ancestors().OfType <ArgumentSyntax>().First();
var delReturnType = (INamedTypeSymbol)bodyFuncReferenceResult.AsyncDelegateArgument.ReturnType;
var returnType = bodyFuncReferenceResult.AsyncCounterpartSymbol.ReturnType;
bool returnTypeMismatch;
if (bodyFuncReferenceResult.ReferenceFunction != null)
{
var refMethod = bodyFuncReferenceResult.ReferenceFunction as IMethodAnalyzationResult;
if (refMethod != null && refMethod.PreserveReturnType)
{
returnTypeMismatch = !delReturnType.Equals(returnType); // TODO Generics
}
else if (delReturnType.IsGenericType) // Generic Task
{
returnTypeMismatch = delReturnType.TypeArguments.First().IsAwaitRequired(returnType);
}
else
{
returnTypeMismatch = delReturnType.IsAwaitRequired(returnType);
}
}
else
{
returnTypeMismatch = !delReturnType.Equals(returnType); // TODO Generics
}
var newArgumentExpression = argumentNode.Expression
.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
)
.WrapInsideFunction(bodyFuncReferenceResult.AsyncDelegateArgument, returnTypeMismatch,
namespaceMetadata.TaskConflict,
invocation => invocation.AddCancellationTokenArgumentIf(cancellationTokenParamName, bodyFuncReferenceResult));
node = node
.ReplaceNode(argumentNode.Expression, newArgumentExpression);
}
else
{
node = node.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
return(node);
}
InvocationExpressionSyntax invokeNode = null;
var isAccessor = bodyFuncReferenceResult.ReferenceSymbol.IsAccessor();
if (!isAccessor && funReferenceResult.ReferenceNode.IsKind(SyntaxKind.InvocationExpression))
{
invokeNode = nameNode.Ancestors().OfType <InvocationExpressionSyntax>().First();
}
if (!bodyFuncReferenceResult.AwaitInvocation)
{
// An arrow method does not have a statement
var statement = nameNode.Ancestors().OfType <StatementSyntax>().FirstOrDefault();
var newNode = (SyntaxNode)statement ?? node;
if (invokeNode != null)
{
newNode = newNode.ReplaceNestedNodes(
invokeNode,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode
.AddCancellationTokenArgumentIf(cancellationTokenParamName, bodyFuncReferenceResult),
funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression)))
);
}
else if (isAccessor)
{
newNode = ConvertAccessor(newNode, nameNode, newNameNode, cancellationTokenParamName, bodyFuncReferenceResult,
invNode => UpdateTypeAndRunReferenceTransformers(invNode, funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression))));
}
else
{
newNode = newNode.ReplaceNestedNodes(
nameNode.Parent as MemberAccessExpressionSyntax,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode, funcResult, funReferenceResult, namespaceMetadata,
(type, fullName) => rootNode.WithExpression(type.CreateTypeSyntax(false, fullName).WithTriviaFrom(rootNode.Expression))),
childNode => RunReferenceTransformers(childNode, funcResult, funReferenceResult, namespaceMetadata)
);
}
if (statement != null && !statement.IsKind(SyntaxKind.LocalFunctionStatement))
{
if (bodyFuncReferenceResult.UseAsReturnValue)
{
newNode = ((StatementSyntax)newNode).ToReturnStatement();
}
node = node
.ReplaceNode(statement, newNode);
}
else
{
node = (T)newNode;
}
}
else
{
// We need to annotate the invocation node because of the AddAwait method as it needs the parent node
var invokeAnnotation = Guid.NewGuid().ToString();
if (isAccessor)
{
node = ConvertAccessor(node, nameNode, newNameNode, cancellationTokenParamName, bodyFuncReferenceResult, invNode =>
UpdateTypeAndRunReferenceTransformers(invNode, funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression)))
.WithAdditionalAnnotations(new SyntaxAnnotation(invokeAnnotation))
);
}
else
{
node = node.ReplaceNestedNodes(
invokeNode,
nameNode,
newNameNode,
rootNode => UpdateTypeAndRunReferenceTransformers(rootNode
.AddCancellationTokenArgumentIf(cancellationTokenParamName, bodyFuncReferenceResult),
funcResult, funReferenceResult, namespaceMetadata,
(memberNode, type, fullName) => memberNode.WithExpression(type.CreateTypeSyntax(true, fullName).WithTriviaFrom(memberNode.Expression)))
.WithAdditionalAnnotations(new SyntaxAnnotation(invokeAnnotation))
);
}
invokeNode = node.GetAnnotatedNodes(invokeAnnotation).OfType <InvocationExpressionSyntax>().First();
var conditionalAccessNode = invokeNode.Ancestors()
.TakeWhile(o => !(o is StatementSyntax))
.OfType <ConditionalAccessExpressionSyntax>()
.FirstOrDefault();
if (conditionalAccessNode != null) // ?. syntax
{
var statement = (StatementSyntax)invokeNode.Ancestors().FirstOrDefault(o => o is StatementSyntax);
var block = statement?.Parent as BlockSyntax;
if (statement == null || block == null)
{
// TODO: convert arrow method/property/function to a normal one
// TODO: convert to block if there is no block
node = node.ReplaceNode(conditionalAccessNode,
conditionalAccessNode.AddAwait(_configuration.ConfigureAwaitArgument));
}
else
{
var fnName = nameNode.Identifier.ValueText;
// TODO: handle name collisions
var variableName = $"{char.ToLowerInvariant(fnName[0])}{fnName.Substring(1)}Task";
var leadingTrivia = statement.GetLeadingTrivia();
var newConditionalAccessNode = ConditionalAccessExpression(
conditionalAccessNode.Expression,
invokeNode)
.WithTriviaFrom(conditionalAccessNode);
var localVar = LocalDeclarationStatement(
VariableDeclaration(
IdentifierName(Identifier(leadingTrivia, "var", TriviaList(Space))),
SingletonSeparatedList(
VariableDeclarator(
Identifier(TriviaList(), variableName, TriviaList(Space)))
.WithInitializer(
EqualsValueClause(newConditionalAccessNode.WithoutTrivia())
.WithEqualsToken(Token(TriviaList(), SyntaxKind.EqualsToken, TriviaList(Space)))
)
)))
.WithSemicolonToken(Token(TriviaList(), SyntaxKind.SemicolonToken, TriviaList(typeMetadata.EndOfLineTrivia)));
var index = block.Statements.IndexOf(statement);
var lastReturnNode = block.DescendantNodes()
.Where(o => o.SpanStart >= statement.SpanStart)
.OfType <ReturnStatementSyntax>()
.LastOrDefault();
var variableAnnotation = Guid.NewGuid().ToString();
var newBlock = block.ReplaceNode(conditionalAccessNode,
conditionalAccessNode.WhenNotNull.ReplaceNode(invokeNode,
IdentifierName(variableName)
.WithAdditionalAnnotations(new SyntaxAnnotation(variableAnnotation))
.WithLeadingTrivia(conditionalAccessNode.GetLeadingTrivia())
.WithTrailingTrivia(conditionalAccessNode.GetTrailingTrivia())
));
var variable = newBlock.GetAnnotatedNodes(variableAnnotation).OfType <IdentifierNameSyntax>().First();
newBlock = newBlock.ReplaceNode(variable, variable.AddAwait(_configuration.ConfigureAwaitArgument));
var ifBlock = Block()
.WithOpenBraceToken(
Token(TriviaList(leadingTrivia), SyntaxKind.OpenBraceToken, TriviaList(typeMetadata.EndOfLineTrivia)))
.WithCloseBraceToken(
Token(TriviaList(leadingTrivia), SyntaxKind.CloseBraceToken, TriviaList(typeMetadata.EndOfLineTrivia)))
.WithStatements(new SyntaxList <StatementSyntax>()
.AddRange(newBlock.AppendIndent(typeMetadata.IndentTrivia.ToFullString()).Statements.Skip(index)));
var ifStatement = IfStatement(
BinaryExpression(
SyntaxKind.NotEqualsExpression,
IdentifierName(Identifier(TriviaList(), variableName, TriviaList(Space))),
LiteralExpression(SyntaxKind.NullLiteralExpression))
.WithOperatorToken(
Token(TriviaList(), SyntaxKind.ExclamationEqualsToken, TriviaList(Space))),
ifBlock
)
.WithIfKeyword(
Token(TriviaList(leadingTrivia), SyntaxKind.IfKeyword, TriviaList(Space)))
.WithCloseParenToken(
Token(TriviaList(), SyntaxKind.CloseParenToken, TriviaList(typeMetadata.EndOfLineTrivia)));
var statements = new SyntaxList <StatementSyntax>()
.AddRange(newBlock.Statements.Take(index))
.Add(localVar)
.Add(ifStatement);
if (lastReturnNode?.Expression != null)
{
// Check if the variable is defined otherwise return default return type value
if (lastReturnNode.Expression is IdentifierNameSyntax idNode &&
statements.OfType <VariableDeclaratorSyntax>().All(o => o.Identifier.ToString() != idNode.Identifier.ValueText))
{
lastReturnNode = lastReturnNode.WithExpression(DefaultExpression(funcResult.GetNode().GetReturnType().WithoutTrivia()));
}
statements = statements.Add(lastReturnNode);
}
node = node.ReplaceNode(block, newBlock.WithStatements(statements));
}
}
else
{
node = node.ReplaceNode(invokeNode, invokeNode.AddAwait(_configuration.ConfigureAwaitArgument));
}
}
return(node);
}
public SyntaxNode TransformFunctionReference(SyntaxNode node, IFunctionAnalyzationResult funcResult,
IFunctionReferenceAnalyzationResult funcReferenceResult,
INamespaceTransformationMetadata namespaceMetadata)
{
if (!funcReferenceResult.AsyncCounterpartSymbol.Equals(_whenAllMethod))
{
return(node);
}
if (!(node is InvocationExpressionSyntax invokeNode) ||
!(funcReferenceResult is IBodyFunctionReferenceAnalyzationResult bodyReference))
{
return(node); // Cref
}
// Here are some examples of expected nodes
// Task.WhenAll(Results, ReadAsync)
// Task.WhenAll(1, 100, ReadAsync)
// Task.WhenAll(Enumerable.Empty<string>(), ReadAsync)
// Task.WhenAll(GetStringList(), i =>
// {
// return SimpleFile.ReadAsync();
// })
// For Parallel.ForEach, we need to combine the two arguments into one, using the Select Linq extension e.g.
// Task.WhenAll(Results.Select(i => ReadAsync(i))
// For Parallel.For, we need to move the first two parameters into Enumerable.Range and then apply the same logic as for
// Parallel.ForEach
var actionParam = bodyReference.ReferenceSymbol.Parameters.Last();
var actionType = actionParam.Type as INamedTypeSymbol;
var actionMethod = actionType?.DelegateInvokeMethod;
if (actionMethod == null)
{
throw new InvalidOperationException(
$"Unable to transform Parallel.{bodyReference.ReferenceSymbol.Name} to Task.WaitAll. " +
$"The second Parallel.{bodyReference.ReferenceSymbol.Name} argument is not a delegate, but is {actionParam.Type}");
}
namespaceMetadata.AddUsing("System.Linq");
var newExpression = invokeNode.ArgumentList.Arguments.Last().Expression;
if (!(newExpression is AnonymousFunctionExpressionSyntax))
{
var delArgument = bodyReference.DelegateArguments.Last();
var cancellationTokenParamName = funcResult.GetMethodOrAccessor().CancellationTokenRequired
? "cancellationToken"
: null; // TODO: find a way to not have this duplicated and fix naming colision
newExpression = newExpression.WrapInsideFunction(actionMethod, false, namespaceMetadata.TaskConflict,
invoke => invoke.AddCancellationTokenArgumentIf(cancellationTokenParamName, delArgument.BodyFunctionReference));
}
ExpressionSyntax enumerableExpression;
if (bodyReference.ReferenceSymbol.Equals(_forMethod))
{
// Construct an Enumerable.Range(1, 10 - 1), where 1 and 10 are the first two arguments of Parallel.For method
var startArg = invokeNode.ArgumentList.Arguments.First();
enumerableExpression = InvocationExpression(
MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("Enumerable").WithLeadingTrivia(startArg.GetLeadingTrivia()),
Token(SyntaxKind.DotToken),
IdentifierName("Range")),
ArgumentList(
SeparatedList <ArgumentSyntax>(
new SyntaxNodeOrToken[]
{
startArg.WithoutTrivia(),
Token(TriviaList(), SyntaxKind.CommaToken, TriviaList(Space)),
Argument(
BinaryExpression(SyntaxKind.SubtractExpression,
invokeNode.ArgumentList.Arguments.Skip(1).First().Expression.WithoutTrivia().WithTrailingTrivia(Space),
Token(TriviaList(), SyntaxKind.MinusToken, TriviaList(Space)),
startArg.WithoutTrivia().Expression))
}
)
)
);
}
else
{
enumerableExpression = invokeNode.ArgumentList.Arguments.First().Expression; // For ForEach take the first parmeter e.g. Enumerable.Range(1, 10)
}
var memberAccess = MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
enumerableExpression,
Token(SyntaxKind.DotToken),
IdentifierName("Select"));
var argument = InvocationExpression(memberAccess)
.WithArgumentList(
ArgumentList(SingletonSeparatedList(Argument(newExpression.WithoutTrivia())))
.WithCloseParenToken(Token(TriviaList(), SyntaxKind.CloseParenToken, newExpression.GetTrailingTrivia()))
);
return(invokeNode.WithArgumentList(
invokeNode.ArgumentList.WithArguments(SingletonSeparatedList(Argument(argument)))));
}
