public void PreprocessorDirectives()
{
SyntaxTree tree = SyntaxFactory.ParseSyntaxTree(@"#if true
class A { }
#else
class B { }
#endif");
SyntaxToken eof = tree.GetRoot().FindToken(tree.GetText().Length, false);
Assert.AreEqual(true, eof.HasLeadingTrivia);
Assert.AreEqual(false, eof.HasTrailingTrivia);
Assert.AreEqual(true, eof.ContainsDirectives);
SyntaxTriviaList trivia = eof.LeadingTrivia;
Assert.AreEqual(3, trivia.Count);
Assert.AreEqual("#else", trivia.ElementAt(0).ToString());
Assert.AreEqual(SyntaxKind.DisabledTextTrivia, trivia.ElementAt(1).CSharpKind());
Assert.AreEqual("#endif", trivia.ElementAt(2).ToString());
DirectiveTriviaSyntax directive = tree.GetRoot().GetLastDirective();
Assert.AreEqual("endif", directive.DirectiveNameToken.Value);
directive = directive.GetPreviousDirective();
Assert.AreEqual("else", directive.DirectiveNameToken.Value);
// List<DirectiveSyntax> relatedDirectives = directive.GetRelatedDirectives();
// Assert.AreEqual(3, relatedDirectives.Count);
}
private static List <SyntaxTrivia> RemoveBlankLineTrivia(SyntaxTriviaList trivia, ref bool changed)
{
List <SyntaxTrivia> newTrivia = new List <SyntaxTrivia>();
for (int i = 0; i < trivia.Count;)
{
SyntaxTrivia trivia1 = trivia.ElementAt(i);
newTrivia.Add(trivia1);
if (i < trivia.Count - 2)
{
SyntaxTrivia trivia2 = trivia.ElementAt(i + 1);
SyntaxTrivia trivia3 = trivia.ElementAt(i + 2);
if (trivia1.IsKind(SyntaxKind.EndOfLineTrivia) &&
trivia2.IsKind(SyntaxKind.WhitespaceTrivia) &&
trivia3.IsKind(SyntaxKind.EndOfLineTrivia))
{
// Skip the whitespace with a newline.
newTrivia.Add(trivia3);
changed = true;
i += 3;
continue;
}
}
i++;
}
return(newTrivia);
}
private static List <SyntaxTrivia> RemoveBlankLines(SyntaxTriviaList trivia, ref bool changed)
{
List <SyntaxTrivia> newTrivia = new List <SyntaxTrivia>();
for (int i = 0; i < trivia.Count;)
{
SyntaxTrivia trivia1 = trivia.ElementAt(i);
newTrivia.Add(trivia1);
if (i < trivia.Count - 1)
{
SyntaxTrivia trivia2 = trivia.ElementAt(i + 1);
if (trivia1.IsKind(SyntaxKind.EndOfLineTrivia) &&
trivia2.IsKind(SyntaxKind.EndOfLineTrivia))
{
changed = true;
i += 2;
continue;
}
}
i++;
}
return(newTrivia);
}
private static XmlNameAttributeSyntax ParseNameAttribute(
string attributeText,
string elementName
)
{
// NOTE: Rather than introducing a new code path that will have to be kept in
// sync with other mode changes distributed throughout Lexer, SyntaxParser, and
// DocumentationCommentParser, we'll just wrap the text in some lexable syntax
// and then extract the piece we want.
string commentText = string.Format(@"/// <{0} {1}/>", elementName, attributeText);
SyntaxTriviaList leadingTrivia = SyntaxFactory.ParseLeadingTrivia(
commentText,
CSharpParseOptions.Default.WithDocumentationMode(DocumentationMode.Diagnose)
);
Debug.Assert(leadingTrivia.Count == 1);
SyntaxTrivia trivia = leadingTrivia.ElementAt(0);
DocumentationCommentTriviaSyntax structure =
(DocumentationCommentTriviaSyntax)trivia.GetStructure();
Debug.Assert(structure.Content.Count == 2);
XmlEmptyElementSyntax elementSyntax = (XmlEmptyElementSyntax)structure.Content[1];
Debug.Assert(elementSyntax.Attributes.Count == 1);
return((XmlNameAttributeSyntax)elementSyntax.Attributes[0]);
}
private static SyntaxTriviaList RemoveTriviaAtIndex(SyntaxTriviaList newTrivia, int index)
{
// Remove trivia
newTrivia = newTrivia.RemoveAt(index);
// Remove end of line after trivia
if (index < newTrivia.Count && newTrivia.ElementAt(index).Kind() == SyntaxKind.EndOfLineTrivia)
{
newTrivia = newTrivia.RemoveAt(index);
}
return(newTrivia);
}
internal static SyntaxTriviaList Normalize(SyntaxTriviaList trivia, string indentWhitespace, string eolWhitespace, bool useElasticTrivia = false)
{
var normalizer = new SyntaxNormalizer(trivia.FullSpan, GetDeclarationDepth(trivia.Token), indentWhitespace, eolWhitespace, useElasticTrivia);
var result = normalizer.RewriteTrivia(
trivia,
GetDeclarationDepth((SyntaxToken)trivia.ElementAt(0).Token),
isTrailing: false,
indentAfterLineBreak: false,
mustHaveSeparator: false,
lineBreaksAfter: 0);
normalizer.Free();
return(result);
}
/// <summary>
/// Determines if the node should be json serialized based on the precedence of
/// a //json single line comment
/// </summary>
public static bool ShouldBeConvertedToJson(this SyntaxNode node, SyntaxTriviaList leadingTrivia)
{
if (leadingTrivia == default)
{
return(false);
}
var singleLineCommentIndex = leadingTrivia.IndexOf(SyntaxKind.SingleLineCommentTrivia);
if (singleLineCommentIndex == -1)
{
return(false);
}
// all trivia after the single line should be whitespace or end of line
if (!leadingTrivia
.SkipWhile((l, i) => i < singleLineCommentIndex)
.Any(l => l.IsKind(SyntaxKind.EndOfLineTrivia) || l.IsKind(SyntaxKind.WhitespaceTrivia)))
{
return(false);
}
return(SingleLineJsonComment.IsMatch(leadingTrivia.ElementAt(singleLineCommentIndex).ToFullString()));
}
private static SyntaxTriviaList RemoveTriviaAtIndex(SyntaxTriviaList newTrivia, int index)
{
// Remove trivia
newTrivia = newTrivia.RemoveAt(index);
// Remove end of line after trivia
if (index < newTrivia.Count && newTrivia.ElementAt(index).Kind() == SyntaxKind.EndOfLineTrivia)
{
newTrivia = newTrivia.RemoveAt(index);
}
return newTrivia;
}