public IEnumerable <TagHelperDescriptor> GetDescriptors([NotNull] Block root)
{
_directiveDescriptors = new List <TagHelperDirectiveDescriptor>();
// This will recurse through the syntax tree.
VisitBlock(root);
var resolutionContext = GetTagHelperDescriptorResolutionContext(_directiveDescriptors, _errorSink);
var descriptors = _descriptorResolver.Resolve(resolutionContext);
return(descriptors);
}
public IEnumerable <TagHelperDescriptor> GetDescriptors(Block root)
{
if (root == null)
{
throw new ArgumentNullException(nameof(root));
}
_directiveDescriptors = new List <TagHelperDirectiveDescriptor>();
// This will recurse through the syntax tree.
VisitBlock(root);
var resolutionContext = GetTagHelperDescriptorResolutionContext(_directiveDescriptors, _errorSink);
var descriptors = _descriptorResolver.Resolve(resolutionContext);
return(descriptors);
}
public override void VisitSpan(Span span)
{
// We're only interested in spans with an AddOrRemoveTagHelperCodeGenerator.
if (span.CodeGenerator is AddOrRemoveTagHelperCodeGenerator)
{
var codeGenerator = (AddOrRemoveTagHelperCodeGenerator)span.CodeGenerator;
if (_descriptorResolver == null)
{
var directive = codeGenerator.RemoveTagHelperDescriptors ?
SyntaxConstants.CSharp.RemoveTagHelperKeyword :
SyntaxConstants.CSharp.AddTagHelperKeyword;
throw new InvalidOperationException(
RazorResources.FormatTagHelpers_CannotUseDirectiveWithNoTagHelperDescriptorResolver(
directive, typeof(ITagHelperDescriptorResolver).FullName, typeof(RazorParser).FullName));
}
// Look up all the descriptors associated with the "LookupText".
var descriptors = _descriptorResolver.Resolve(codeGenerator.LookupText);
if (codeGenerator.RemoveTagHelperDescriptors)
{
var evaluatedDescriptors =
new HashSet <TagHelperDescriptor>(descriptors, TagHelperDescriptorComparer.Default);
// We remove all found descriptors from the descriptor list to ignore the associated TagHelpers on the
// Razor page.
_descriptors.RemoveAll(descriptor => evaluatedDescriptors.Contains(descriptor));
}
else
{
// Add all the found descriptors to our list.
_descriptors.AddRange(descriptors);
}
}
}