public void Execute(GeneratorExecutionContext context)
{
// Add the attribute declaration
context.AddSource("constructFromAttr", ConstructFromGenerator.constructFromAttrSource);
// Get the syntax receiver
if (context.SyntaxReceiver is not ConstructFromSyntaxReceiver syntaxReceiver)
{
context.ReportInternalError("Unexpected error: could not retrieve the syntax.");
return;
}
// Add the conversions
var messages = new List <string>(syntaxReceiver.Messages);
foreach (var candidate in syntaxReceiver.Candidates)
{
messages.Add(
$"Candidate type found: {candidate.TypeDeclaration.Identifier.ValueText} from {candidate.FromType}"
);
// Get the semantic model of the type declaration
var semanticModel =
context.Compilation.GetSemanticModel(candidate.TypeDeclaration.SyntaxTree);
var typeDeclarationSymbol = semanticModel.GetDeclaredSymbol(
candidate.TypeDeclaration,
context.CancellationToken
);
if (typeDeclarationSymbol is null)
{
context.ReportInternalError(
"Unexpected error: could not get type information for fromType.",
location: candidate.FromType.GetLocation()
);
continue;
}
// TODO: reject generic types - not yet implemented
if (typeDeclarationSymbol.IsGenericType)
{
context.ReportInternalError(
"Generic types are currently not supported.",
location: candidate.FromType.GetLocation()
);
continue;
}
// Get the target type's symbol
var fromTypeSymbolInfo = semanticModel.GetSymbolInfo(
candidate.FromType,
context.CancellationToken
);
if (fromTypeSymbolInfo.Symbol is not INamedTypeSymbol fromTypeSymbol)
{
context.ReportInternalError(
"Unexpected error: could not get type information for fromType.",
location: candidate.FromType.GetLocation()
);
continue;
}
// Reject unbound generic types
if (fromTypeSymbol.IsUnboundGenericType)
{
context.ReportError(
Constants.UnboundGenericErrorId,
"Unbound generic types are not supported.",
location: candidate.FromType.GetLocation()
);
continue;
}
// Type kind name
var typeKindName = typeDeclarationSymbol switch
{
{ IsRecord : true } => "record",