private ComponentChildContentIntermediateNode RewriteChildContent(BoundAttributeDescriptor attribute, SourceSpan?source, IntermediateNodeCollection children)
{
var childContent = new ComponentChildContentIntermediateNode()
{
BoundAttribute = attribute,
Source = source,
TypeName = attribute?.TypeName ?? ComponentsApi.RenderFragment.FullTypeName,
};
// There are two cases here:
// 1. Implicit child content - the children will be non-taghelper nodes, just accept them
// 2. Explicit child content - the children will be various tag helper nodes, that need special processing.
for (var i = 0; i < children.Count; i++)
{
var child = children[i];
if (child is TagHelperBodyIntermediateNode body)
{
// The body is all of the content we want to render, the rest of the children will
// be the attributes.
for (var j = 0; j < body.Children.Count; j++)
{
childContent.Children.Add(body.Children[j]);
}
}
else if (child is TagHelperPropertyIntermediateNode property)
{
if (property.BoundAttribute.IsChildContentParameterNameProperty())
{
// Check for each child content with a parameter name, that the parameter name is specified
// with literal text. For instance, the following is not allowed and should generate a diagnostic.
//
// <MyComponent><ChildContent Context="@Foo()">...</ChildContent></MyComponent>
if (TryGetAttributeStringContent(property, out var parameterName))
{
childContent.ParameterName = parameterName;
continue;
}
// The parameter name is invalid.
childContent.Diagnostics.Add(ComponentDiagnosticFactory.Create_ChildContentHasInvalidParameter(property.Source, property.AttributeName, attribute.Name));
continue;
}
// This is an unrecognized attribute, this is possible if you try to do something like put 'ref' on a child content.
childContent.Diagnostics.Add(ComponentDiagnosticFactory.Create_ChildContentHasInvalidAttribute(property.Source, property.AttributeName, attribute.Name));
}
else if (child is TagHelperHtmlAttributeIntermediateNode a)
{
// This is an HTML attribute on a child content.
childContent.Diagnostics.Add(ComponentDiagnosticFactory.Create_ChildContentHasInvalidAttribute(a.Source, a.AttributeName, attribute.Name));
}
else
{
// This is some other kind of node (likely an implicit child content)
childContent.Children.Add(child);
}
}
return(childContent);
}
