private static void AnalyzeSyntaxTree(SyntaxTreeAnalysisContext context)
{
SyntaxTree tree = context.Tree;
if (!tree.TryGetText(out SourceText sourceText))
{
return;
}
int maxLength = context.GetConfigOptions().GetMaxLineLength();
if (maxLength <= 0)
{
return;
}
SyntaxNode root = tree.GetRoot(context.CancellationToken);
int i = 0;
SyntaxTrivia trivia = root.FindTrivia(0);
if (trivia.SpanStart == 0 &&
trivia.IsKind(SyntaxKind.SingleLineCommentTrivia, SyntaxKind.MultiLineCommentTrivia))
{
SyntaxTriviaList leadingTrivia = trivia.Token.LeadingTrivia;
int count = leadingTrivia.Count;
if (count > 1)
{
int j = 0;
while (j < leadingTrivia.Count - 1 &&
leadingTrivia[j].IsKind(SyntaxKind.SingleLineCommentTrivia, SyntaxKind.MultiLineCommentTrivia) &&
leadingTrivia[j + 1].IsKind(SyntaxKind.EndOfLineTrivia))
{
i++;
j += 2;
}
}
}
TextLineCollection lines = sourceText.Lines;
for (; i < lines.Count; i++)
{
TextLine line = lines[i];
if (line.Span.Length <= maxLength)
{
continue;
}
int end = line.End;
SyntaxToken token = root.FindToken(end);
if (token.IsKind(SyntaxKind.StringLiteralToken))
{
TextSpan span = token.Span;
if (span.End == end)
{
if (span.Length >= maxLength)
{
continue;
}
}
else if (span.Contains(end) &&
end - span.Start >= maxLength)
{
continue;
}
}
SyntaxTriviaList list = default;
if (token.LeadingTrivia.Span.Contains(end))
{
list = token.LeadingTrivia;
}
else if (token.TrailingTrivia.Span.Contains(end))
{
list = token.TrailingTrivia;
}
if (list.Any())
{
int index = -1;
for (int j = 0; j < list.Count; j++)
{
if (list[j].Span.Contains(end))
{
trivia = list[j];
index = j;
}
}
if (index >= 0)
{
SyntaxKind kind = trivia.Kind();
if (kind == SyntaxKind.MultiLineCommentTrivia ||
kind == SyntaxKind.SingleLineDocumentationCommentTrivia ||
kind == SyntaxKind.MultiLineDocumentationCommentTrivia)
{
continue;
}
if (kind == SyntaxKind.EndOfLineTrivia &&
index > 0 &&
list[index - 1].IsKind(SyntaxKind.SingleLineCommentTrivia))
{
continue;
}
}
}
DiagnosticHelpers.ReportDiagnostic(
context,
DiagnosticRules.LineIsTooLong,
Location.Create(tree, line.Span),
line.Span.Length);
}
}
