/// <summary>
/// Get the syntax node's first ancestor of the specified kind.
/// </summary>
/// <param name="syntaxNode">
/// The target syntax node.
/// </param>
/// <param name="syntaxKind">
/// The kind of node to find.
/// </param>
/// <returns>
/// The ancestor node, or <c>null</c> if no ancestor of the specified kind was found.
/// </returns>
public static SyntaxNode GetFirstParentOfKind(this SyntaxNode syntaxNode, SyntaxKind syntaxKind)
{
if (syntaxNode == null)
{
throw new ArgumentNullException(nameof(syntaxNode));
}
if (syntaxNode.Kind == syntaxKind)
{
return(syntaxNode);
}
return(syntaxNode.AncestorNodes().FirstOrDefault(node => node.Kind == syntaxKind));
}
/// <summary>
/// Get the syntax node's first ancestor of any of the specified kinds.
/// </summary>
/// <param name="syntaxNode">
/// The target syntax node.
/// </param>
/// <param name="syntaxKinds">
/// The kinds of node to find.
/// </param>
/// <returns>
/// The ancestor node, or <c>null</c> if no ancestor of any of the specified kinds was found.
/// </returns>
public static SyntaxNode GetFirstParentOfKinds(this SyntaxNode syntaxNode, params SyntaxKind[] syntaxKinds)
{
if (syntaxNode == null)
{
throw new ArgumentNullException(nameof(syntaxNode));
}
HashSet <SyntaxKind> kinds = new HashSet <SyntaxKind>(syntaxKinds);
if (kinds.Contains(syntaxNode.Kind))
{
return(syntaxNode);
}
return(syntaxNode.AncestorNodes().FirstOrDefault(node => kinds.Contains(node.Kind)));
}
/// <summary>
/// Get the syntax node's first ancestor of the specified type.
/// </summary>
/// <param name="syntaxNode">
/// The target syntax node.
/// </param>
/// <returns>
/// The ancestor node, or <c>null</c> if no ancestor of the specified type was found.
/// </returns>
public static TSyntax GetFirstParentOfType <TSyntax>(this SyntaxNode syntaxNode)
{
return(syntaxNode.AncestorNodes().OfType <TSyntax>().FirstOrDefault());
}
