public override void VisitComponent(ComponentIntermediateNode node)
{
for (var i = 0; i < node.Children.Count; i++)
{
// Note that we don't handle ChildContent cases here. Those have their own pass for diagnostics.
if (node.Children[i] is ComponentAttributeIntermediateNode attribute && attribute.AttributeName != null)
{
if (_attributes.TryGetValue(attribute.AttributeName, out var other))
{
// As a special case we want to point it out explicitly where a directive or other construct
// has emitted an attribute that causes a conflict. We're already looking at the lowered version
// of this construct, so it's easy to detect. We just need the original name to report the issue.
//
// Example: `bind-Value` will set `Value` and `ValueChanged`.
var originalAttributeName =
attribute.Annotations[ComponentMetadata.Common.OriginalAttributeName] as string ??
other.node.Annotations[ComponentMetadata.Common.OriginalAttributeName] as string;
if (originalAttributeName != null)
{
other.node.Diagnostics.Add(ComponentDiagnosticFactory.Create_DuplicateComponentParameterDirective(
other.name,
originalAttributeName,
other.node.Source ?? node.Source));
}
else
{
// This is a conflict in the code the user wrote.
other.node.Diagnostics.Add(ComponentDiagnosticFactory.Create_DuplicateComponentParameter(
other.name,
other.node.Source ?? node.Source));
}
}
// Replace the attribute we were previously tracking. Then if you have three, the two on the left will have
// diagnostics.
_attributes[attribute.AttributeName] = (attribute.AttributeName, attribute);
}
}
_attributes.Clear();
base.VisitComponent(node);
}