/// <summary>
/// Add <paramref name="typeparam"/> element to <paramref name="comment"/>
/// Replace if a summary element exists.
/// If the comment is attached to a method the param element is inserted at the correct position.
/// </summary>
/// <param name="comment">The <see cref="DocumentationCommentTriviaSyntax"/>.</param>
/// <param name="typeparam"> The <see cref="XmlElementSyntax"/>.</param>
/// <returns><paramref name="comment"/> with <paramref name="typeparam"/>.</returns>
public static DocumentationCommentTriviaSyntax WithTypeParam(this DocumentationCommentTriviaSyntax comment, XmlElementSyntax typeparam)
{
if (comment is null)
{
throw new ArgumentNullException(nameof(comment));
}
if (typeparam.TryGetNameAttribute(out var attribute) &&
attribute.Identifier is { } identifierName)
{
if (comment.TryGetTypeParam(identifierName.Identifier.ValueText, out var old))
{
return(comment.ReplaceNode(old, typeparam));
}
if (TryGetPositionFromTypeParam(out var before, out var after))
{
if (after is { })
{
return(comment.InsertBefore(after, typeparam));
}
return(comment.InsertAfter(before, typeparam));
}
foreach (var node in comment.Content)
{
if (node is XmlElementSyntax e &&
(e.HasLocalName("param") ||
e.HasLocalName("returns") ||
e.HasLocalName("exception")))
{
return(comment.InsertBefore(e, typeparam));
}
}
return(comment.InsertAfter(comment.Content.OfType <XmlElementSyntax>().Last(), typeparam));
}
/// <summary>
/// Add <paramref name="typeparam"/> element to <paramref name="comment"/>
/// Replace if a summary element exists.
/// If the comment is attached to a method the param element is inserted at the correct position.
/// </summary>
/// <param name="comment">The <see cref="DocumentationCommentTriviaSyntax"/>.</param>
/// <param name="typeparam"> The <see cref="XmlElementSyntax"/>.</param>
/// <returns><paramref name="comment"/> with <paramref name="typeparam"/>.</returns>
public static DocumentationCommentTriviaSyntax WithTypeParam(this DocumentationCommentTriviaSyntax comment, XmlElementSyntax typeparam)
{
if (comment is null)
{
throw new ArgumentNullException(nameof(comment));
}
if (typeparam.TryGetNameAttribute(out var attribute) &&
attribute.Identifier is IdentifierNameSyntax identifierName)
{
if (comment.TryGetTypeParam(identifierName.Identifier.ValueText, out var old))
{
return(comment.ReplaceNode(old, typeparam));
}
if (TryGetPositionFromTypeParam(out var before, out var after))
{
if (after != null)
{
return(comment.InsertBefore(after, typeparam));
}
return(comment.InsertAfter(before, typeparam));
}
foreach (var node in comment.Content)
{
if (node is XmlElementSyntax e &&
(e.HasLocalName("param") ||
e.HasLocalName("returns") ||
e.HasLocalName("exception")))
{
return(comment.InsertBefore(e, typeparam));
}
}
return(comment.InsertAfter(comment.Content.OfType <XmlElementSyntax>().Last(), typeparam));
}
throw new ArgumentException("Element does not have a name attribute.", nameof(typeparam));
bool TryGetPositionFromTypeParam(out XmlElementSyntax before, out XmlElementSyntax after)
{
before = null !;
after = null !;
if (comment.TryFirstAncestor(out MemberDeclarationSyntax? member) &&
TryGetTypeParameterList(member, out var typeParameterList) &&
typeParameterList.Parameters.TrySingle(x => x.Identifier.ValueText == identifierName.Identifier.ValueText, out var parameter) &&
typeParameterList.Parameters.IndexOf(parameter) is var ordinal &&
ordinal >= 0)
{
foreach (var node in comment.Content)
{
if (node is XmlElementSyntax e &&
e.HasLocalName("typeparam") &&
e.TryGetNameAttribute(out var nameAttribute) &&
typeParameterList.Parameters.TrySingle(x => x.Identifier.ValueText == nameAttribute.Identifier.Identifier.ValueText, out var other))
{
before = e;
if (ordinal < typeParameterList.Parameters.IndexOf(other))
{
after = e;
return(true);
}
}
}
}
return(before != null);