public override void VisitResourceAccessSyntax(ResourceAccessSyntax syntax)
{
base.VisitResourceAccessSyntax(syntax);
// we need to resolve which resource delaration the LHS is pointing to - and then
// validate that we can resolve the name.
this.bindings.TryGetValue(syntax.BaseExpression, out var symbol);
if (symbol is ErrorSymbol)
{
this.bindings.Add(syntax, symbol);
return;
}
else if (symbol is null || symbol is not ResourceSymbol)
{
// symbol could be null in the case of an incomplete expression during parsing like `a:`
var error = new ErrorSymbol(DiagnosticBuilder.ForPosition(syntax.ResourceName).ResourceRequiredForResourceAccess(symbol?.Kind.ToString() ?? LanguageConstants.ErrorName));
this.bindings.Add(syntax, error);
return;
}
// This is the symbol of LHS and it's a valid resource.
var resourceSymbol = (ResourceSymbol)symbol;
var resourceBody = resourceSymbol.DeclaringResource.TryGetBody();
if (resourceBody == null)
{
// If we have no body then there will be nothing to reference.
var error = new ErrorSymbol(DiagnosticBuilder.ForPosition(syntax.ResourceName).NestedResourceNotFound(resourceSymbol.Name, syntax.ResourceName.IdentifierName, nestedResourceNames: new [] { "(none)", }));
this.bindings.Add(syntax, error);
return;
}
if (!this.allLocalScopes.TryGetValue(resourceBody, out var localScope))
{
// code defect in the declaration visitor
throw new InvalidOperationException($"Local scope is missing for {syntax.GetType().Name} at {syntax.Span}");
}
var referencedResource = LookupResourceSymbolByName(localScope, syntax.ResourceName);
if (referencedResource is null)
{
var nestedResourceNames = localScope.Declarations.OfType <ResourceSymbol>().Select(r => r.Name);
var error = new ErrorSymbol(DiagnosticBuilder.ForPosition(syntax.ResourceName).NestedResourceNotFound(resourceSymbol.Name, syntax.ResourceName.IdentifierName, nestedResourceNames));
this.bindings.Add(syntax, error);
return;
}
// This is valid.
this.bindings.Add(syntax, referencedResource);
}
public virtual void VisitErrorSymbol(ErrorSymbol symbol)
{
VisitDescendants(symbol);
}
public override void VisitErrorSymbol(ErrorSymbol symbol)
{
base.VisitErrorSymbol(symbol);
this.CollectDiagnostics(symbol);
}