public static IEnumerable <T> GetAncestorsOrThis <T>(this SyntaxNode node, bool allowStructuredTrivia = false)
where T : SyntaxNode
{
SyntaxNode current = node;
while (current != null)
{
if (current is T)
{
yield return((T)current);
}
if (allowStructuredTrivia &&
current.IsStructuredTrivia &&
current.Parent == null)
{
StructuredTriviaSyntax structuredTrivia = (StructuredTriviaSyntax)current;
SyntaxTrivia parentTrivia = structuredTrivia.ParentTrivia;
current = parentTrivia.Token.Parent;
}
else
{
current = current.Parent;
}
}
}
/// <summary>Adds a new line at the end of a nodes leading trivia.</summary>
/// <param name="node">The node whose leading trivia the new line should be added.</param>
/// <param name="triviaSyntax">The structured tricia syntax to add.</param>
/// <returns>The provided <paramref name="node"/> with a leading trivia including
/// the original leading trivia and the provided <paramref name="triviaSyntax"/>.</returns>
private static SyntaxNode AddLineToLeadingTrivia(SyntaxNode node, StructuredTriviaSyntax triviaSyntax)
{
SyntaxTriviaList currentLeadingTrivia = node.GetLeadingTrivia();
SyntaxTrivia newContentTrivia = SyntaxFactory.Trivia(triviaSyntax);
SyntaxTrivia endOfLineTrivia = SyntaxFactory.EndOfLine(Environment.NewLine);
SyntaxTriviaList newLeadingTrivia = currentLeadingTrivia.Add(newContentTrivia).Add(endOfLineTrivia);
return(node.WithLeadingTrivia(newLeadingTrivia));
}
internal SyntaxTrivia(SyntaxTree syntaxTree, SyntaxKind kind, string text, TextSpan span, StructuredTriviaSyntax structure, IEnumerable <Diagnostic> diagnostics)
{
_syntaxTree = syntaxTree;
Kind = kind;
Text = text;
Span = span;
Structure = structure;
Diagnostics = diagnostics.ToImmutableArray();
}
/// <summary>
/// Transforms a <see cref="SyntaxTrivia"/> to ensure no formatting operations will be applied to the trivia or
/// any of its descendants when a <see cref="CodeAction"/> is applied.
/// </summary>
/// <param name="trivia">The syntax trivia.</param>
/// <returns>
/// A syntax trivia which is equivalent to the input <paramref name="trivia"/>, but which will not be subject to
/// automatic code formatting operations when applied as part of a <see cref="CodeAction"/>.
/// </returns>
public static SyntaxTrivia WithoutFormatting(this SyntaxTrivia trivia)
{
// Strategy
// 1. Replace the structure, if any, with a structure that will not be reformatted
// 2. Remove formatting from the resulting trivia
SyntaxTrivia result = trivia;
if (trivia.HasStructure)
{
// GetStructure() returns SyntaxNode instead of StructuredTriviaSyntax. For C# code, this should always
// be an actual instance of StructuredTriviaSyntax, but we handle the case where it is not by leaving
// the structure node unaltered rather than throwing some sort of exception.
StructuredTriviaSyntax structure = trivia.GetStructure() as StructuredTriviaSyntax;
if (structure != null)
{
result = SyntaxFactory.Trivia(structure.WithoutFormatting());
}
}
return(WithoutFormattingImpl(trivia));
}
public TameStructuredTriviaSyntax(StructuredTriviaSyntax node)
{
Node = node;
AddChildren();
}
internal SyntaxTrivia GetParentTrivia(StructuredTriviaSyntax structuredTrivia)
{
return(GetParent <SyntaxTrivia>(structuredTrivia));
}
