Rewrite analyzers 'add/remove newline/blank line'

src/Common/CSharp/SyntaxTriviaAnalysis.cs

@@ -29,14 +29,6 @@ public static bool IsExteriorTriviaEmptyOrWhitespace(SyntaxToken token)
  && token.TrailingTrivia.IsEmptyOrWhitespace();
  }
 
- public static bool IsEmptyOrSingleWhitespaceTrivia(SyntaxTriviaList triviaList)
- {
- int count = triviaList.Count;
-
- return count == 0
- || (count == 1 && triviaList[0].IsWhitespaceTrivia());
- }
-
  public static SyntaxTrivia DetermineEndOfLine(SyntaxNodeOrToken nodeOrToken, SyntaxTrivia? defaultValue = null)
  {
  if (nodeOrToken.IsNode)
@@ -114,94 +106,6 @@ private static SyntaxTrivia FindEndOfLine(SyntaxToken token)
  return default;
  }
 
- public static bool IsTokenPrecededWithNewLineAndNotFollowedWithNewLine(
- ExpressionSyntax left,
- SyntaxToken token,
- ExpressionSyntax right)
- {
- return IsOptionalWhitespaceThenEndOfLineTrivia(left.GetTrailingTrivia())
- && token.LeadingTrivia.IsEmptyOrWhitespace()
- && token.TrailingTrivia.SingleOrDefault(shouldThrow: false).IsKind(SyntaxKind.None, SyntaxKind.WhitespaceTrivia)
- && !right.GetLeadingTrivia().Any();
- }
-
- public static bool IsTokenFollowedWithNewLineAndNotPrecededWithNewLine(
- ExpressionSyntax left,
- SyntaxToken token,
- ExpressionSyntax right)
- {
- return left.GetTrailingTrivia().SingleOrDefault(shouldThrow: false).IsKind(SyntaxKind.None, SyntaxKind.WhitespaceTrivia)
- && !token.LeadingTrivia.Any()
- && IsOptionalWhitespaceThenEndOfLineTrivia(token.TrailingTrivia)
- && right.GetLeadingTrivia().IsEmptyOrWhitespace();
- }
-
- public static bool IsOptionalWhitespaceThenEndOfLineTrivia(SyntaxTriviaList triviaList)
- {
- SyntaxTriviaList.Enumerator en = triviaList.GetEnumerator();
-
- if (!en.MoveNext())
- return false;
-
- SyntaxKind kind = en.Current.Kind();
-
- if (kind == SyntaxKind.WhitespaceTrivia)
- {
- if (!en.MoveNext())
- return false;
-
- kind = en.Current.Kind();
- }
-
- return kind == SyntaxKind.EndOfLineTrivia
- && !en.MoveNext();
- }
-
- public static bool IsOptionalWhitespaceThenOptionalSingleLineCommentThenEndOfLineTrivia(SyntaxTriviaList triviaList)
- {
- SyntaxTriviaList.Enumerator en = triviaList.GetEnumerator();
-
- if (!en.MoveNext())
- return false;
-
- SyntaxKind kind = en.Current.Kind();
-
- if (kind == SyntaxKind.WhitespaceTrivia)
- {
- if (!en.MoveNext())
- return false;
-
- kind = en.Current.Kind();
- }
-
- if (kind == SyntaxKind.SingleLineCommentTrivia)
- {
- if (!en.MoveNext())
- return false;
-
- kind = en.Current.Kind();
- }
-
- return kind == SyntaxKind.EndOfLineTrivia
- && !en.MoveNext();
- }
-
- public static bool StartsWithOptionalWhitespaceThenEndOfLineTrivia(SyntaxTriviaList trivia)
- {
- SyntaxTriviaList.Enumerator en = trivia.GetEnumerator();
-
- if (!en.MoveNext())
- return false;
-
- if (en.Current.IsWhitespaceTrivia()
- && !en.MoveNext())
- {
- return false;
- }
-
- return en.Current.IsEndOfLineTrivia();
- }
-
  public static IndentationAnalysis AnalyzeIndentation(SyntaxNode node, AnalyzerConfigOptions configOptions, CancellationToken cancellationToken = default)
  {
  return IndentationAnalysis.Create(node, configOptions, cancellationToken);
@@ -318,11 +222,6 @@ public static SyntaxTriviaList GetIncreasedIndentationTriviaList(SyntaxNode node
  return AnalyzeIndentation(node, configOptions, cancellationToken).GetIncreasedIndentationTriviaList();
  }
 
- public static IEnumerable<IndentationInfo> FindIndentations(SyntaxNode node)
- {
- return FindIndentations(node, node.FullSpan);
- }
-
  public static IEnumerable<IndentationInfo> FindIndentations(SyntaxNode node, TextSpan span)
  {
  foreach (SyntaxTrivia trivia in node.DescendantTrivia(span))