private static async Task <Document> CreateMappingLambda(Document document, InvocationExpressionSyntax invocation, CancellationToken cancellationToken)
{
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var syntaxGenerator = SyntaxGenerator.GetGenerator(document);
var methodInvocationSymbol = semanticModel.GetSymbolInfo(invocation.Expression, cancellationToken);
var mappingOverload = methodInvocationSymbol.CandidateSymbols.OfType <IMethodSymbol>().FirstOrDefault(IsMappingMethod);
if (mappingOverload == null)
{
return(document);
}
var parameterType = ((INamedTypeSymbol)mappingOverload.Parameters[0].Type);
var sourceElementType = parameterType.TypeArguments[0];
var targetElementType = GetExpressionType(semanticModel, invocation);
if (targetElementType == null)
{
return(document);
}
var mappingEngine = new MappingEngine(semanticModel, syntaxGenerator);
var sourceListElementType = new AnnotatedType(sourceElementType);
var mappingLambda = await mappingEngine.CreateMappingLambdaAsync("x", sourceListElementType, targetElementType, new MappingPath(), new MappingContext(invocation, semanticModel)).ConfigureAwait(false);
return(await document.ReplaceNodes(invocation, invocation.WithArgumentList(SyntaxFactory.ArgumentList().AddArguments(SyntaxFactory.Argument((ExpressionSyntax)mappingLambda))), cancellationToken).ConfigureAwait(false));
}