Various visibility (and other) cleanup.

Sources/SwiftFormatConfiguration/Configuration.swift

@@ -14,7 +14,7 @@ import Foundation
 
 /// A version number that can be specified in the configuration file, which allows us to change the
 /// format in the future if desired and still support older files.
-private let highestSupportedConfigurationVersion = 1
+fileprivate let highestSupportedConfigurationVersion = 1
 
 /// Holds the complete set of configured values and defaults.
 public struct Configuration: Codable, Equatable {

Sources/SwiftFormatCore/Rule.swift

@@ -22,7 +22,7 @@ public protocol Rule {
   init(context: Context)
 }
 
-private var nameCache = [ObjectIdentifier: String]()
+fileprivate var nameCache = [ObjectIdentifier: String]()
 
 extension Rule {
   /// By default, the `ruleName` is just the name of the implementing rule class.

Sources/SwiftFormatCore/RuleMask.swift

@@ -86,7 +86,7 @@ extension SourceRange {
 /// The rule status comment directives implementation intentionally supports exactly the same nodes
 /// as `TokenStreamCreator` to disable pretty printing. This ensures ignore comments for pretty
 /// printing and for rules are as consistent as possible.
-private class RuleStatusCollectionVisitor: SyntaxVisitor {
+fileprivate class RuleStatusCollectionVisitor: SyntaxVisitor {
   /// Describes the possible matches for ignore directives, in comments.
   enum RuleStatusDirectiveMatch {
     /// There is a directive that applies to all rules.

Sources/SwiftFormatCore/SyntaxProtocol+Convenience.swift

@@ -13,66 +13,6 @@
 import SwiftSyntax
 
 extension SyntaxProtocol {
-  /// Walks up from the current node to find the nearest node that is an
-  /// Expr, Stmt, or Decl.
-  public var containingExprStmtOrDecl: Syntax? {
-    var node: Syntax? = Syntax(self)
-    while let parent = node?.parent {
-      if parent.is(ExprSyntax.self) || parent.is(StmtSyntax.self) || parent.is(DeclSyntax.self) {
-        return parent
-      }
-      node = parent
-    }
-    return nil
-  }
-
-  /// Returns true if the node occupies a single line.
-  ///
-  /// - Parameters:
-  ///   - includingLeadingComment: If true, factor any possible leading comments into the
-  ///     determination of whether the node occupies a single line.
-  ///   - sourceLocationConverter: Used to convert source positions to line/column locations.
-  /// - Returns: True if the node occupies a single line.
-  public func isSingleLine(
-    includingLeadingComment: Bool,
-    sourceLocationConverter: SourceLocationConverter
-  ) -> Bool {
-    guard let firstToken = firstToken, let lastToken = lastToken else { return true }
-
-    let startPosition: AbsolutePosition
-    if includingLeadingComment {
-      // Iterate over the trivia, stopping at the first comment, and using that as the start
-      // position.
-      var currentPosition = firstToken.position
-      var sawNewline = false
-      loop: for piece in firstToken.leadingTrivia {
-        switch piece {
-        case .docLineComment,
-          .docBlockComment,
-          .lineComment where sawNewline,
-          .blockComment where sawNewline:
-          // Non-doc line or block comments before we've seen the first newline should actually be
-          // considered trailing comments of the previous line.
-          break loop
-        case .newlines, .carriageReturns, .carriageReturnLineFeeds:
-          sawNewline = true
-          fallthrough
-        default:
-          currentPosition += piece.sourceLength
-        }
-      }
-      startPosition = currentPosition
-    } else {
-      startPosition = firstToken.positionAfterSkippingLeadingTrivia
-    }
-
-    let startLocation = sourceLocationConverter.location(for: startPosition)
-    let endLocation = sourceLocationConverter.location(
-      for: lastToken.endPositionBeforeTrailingTrivia)
-
-    return startLocation.line == endLocation.line
-  }
-
   /// Returns the absolute position of the trivia piece at the given index in the receiver's leading
   /// trivia collection.
   ///

Sources/SwiftFormatCore/Trivia+Convenience.swift

@@ -13,43 +13,6 @@
 import SwiftSyntax
 
 extension Trivia {
-  /// Returns the number of non-newline whitespace characters in this trivia.
-  public var numberOfSpaces: Int {
-    var count = 0
-    for piece in self {
-      switch piece {
-      case .tabs(let n), .spaces(let n): count += n
-      default: continue
-      }
-    }
-    return count
-  }
-
-  /// Returns the number of newlines in this trivia.
-  public var numberOfNewlines: Int {
-    var count = 0
-    for piece in self {
-      if case .newlines(let n) = piece {
-        count += n
-      }
-    }
-    return count
-  }
-
-  /// Returns the number of leading newlines in this trivia.
-  public var numberOfLeadingNewlines: Int {
-    var count = 0
-    loop: for piece in self {
-      switch piece {
-      case .newlines(let n): count += n
-      case .carriageReturns(let n): count += n
-      case .carriageReturnLineFeeds(let n): count += n
-      default: break loop
-      }
-    }
-    return count
-  }
-
   public var numberOfComments: Int {
     var count = 0
     for piece in self {
@@ -71,14 +34,6 @@ extension Trivia {
     }
   }
 
-  public var hasSpaces: Bool {
-    for piece in self {
-      if case .tabs = piece { return true }
-      if case .spaces = piece { return true }
-    }
-    return false
-  }
-
   /// Returns this set of trivia, without any whitespace characters.
   public func withoutSpaces() -> Trivia {
     return Trivia(
@@ -89,50 +44,6 @@ extension Trivia {
       })
   }
 
-  /// Returns this set of trivia without any trailing whitespace characters.
-  public func withoutTrailingSpaces() -> Trivia {
-    var pieces = [TriviaPiece]()
-    guard var prev = first else { return self }
-    for piece in dropFirst() {
-      switch (prev, piece) {
-      case (.spaces(_), .newlines(_)),
-        (.tabs(_), .newlines(_)):
-        prev = piece
-      default:
-        pieces.append(prev)
-        prev = piece
-      }
-    }
-    pieces.append(prev)
-    return Trivia(pieces: pieces).condensed()
-  }
-
-  /// Returns this set of trivia, without any leading newline characters.
-  public func withoutLeadingNewlines() -> Trivia {
-    let triviaCondensed = self.condensed()
-    guard let firstPieceOfTrivia = triviaCondensed.first else { return self }
-    if case .newlines(_) = firstPieceOfTrivia {
-      var pieces = [TriviaPiece]()
-      for piece in triviaCondensed.dropFirst() {
-        pieces.append(piece)
-      }
-      return Trivia(pieces: pieces)
-    } else {
-      return self
-    }
-  }
-
-  /// Returns this set of trivia, without any trailing newline characters.
-  public func withoutTrailingNewlines() -> Trivia {
-    let triviaCondensed = self.condensed()
-    guard let lastPieceOfTrivia = triviaCondensed.suffix(1).first else { return self }
-    if case .newlines(_) = lastPieceOfTrivia {
-      return Trivia(pieces: triviaCondensed.dropLast())
-    } else {
-      return self
-    }
-  }
-
   /// Returns this set of trivia, without any newlines.
   public func withoutNewlines() -> Trivia {
     return Trivia(

Sources/SwiftFormatPrettyPrint/Comment.swift

@@ -40,7 +40,7 @@ struct Comment {
 
   let kind: Kind
   var text: [String]
-  public var length: Int
+  var length: Int
 
   init(kind: Kind, text: String) {
     self.kind = kind

Sources/SwiftFormatPrettyPrint/PrettyPrint.swift

@@ -779,12 +779,12 @@ public class PrettyPrinter {
 
 extension Diagnostic.Message {
 
-  static let moveEndOfLineComment = Diagnostic.Message(
+  public static let moveEndOfLineComment = Diagnostic.Message(
     .warning, "move end-of-line comment that exceeds the line length")
 
-  static let addTrailingComma = Diagnostic.Message(
+  public static let addTrailingComma = Diagnostic.Message(
     .warning, "add trailing comma to the last element in multiline collection literal")
 
-  static let removeTrailingComma = Diagnostic.Message(
+  public static let removeTrailingComma = Diagnostic.Message(
     .warning, "remove trailing comma from the last element in single line collection literal")
 }

Sources/SwiftFormatPrettyPrint/Token.swift

@@ -10,10 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-import SwiftFormatConfiguration
-import SwiftFormatCore
-import SwiftSyntax
-
 enum GroupBreakStyle {
   /// A consistent break indicates that the break will always be finalized as a newline
   /// if wrapping occurs.

Sources/SwiftFormatPrettyPrint/TokenStreamCreator.swift

@@ -17,7 +17,7 @@ import SwiftSyntax
 
 /// Visits the nodes of a syntax tree and constructs a linear stream of formatting tokens that
 /// tell the pretty printer how the source text should be laid out.
-private final class TokenStreamCreator: SyntaxVisitor {
+fileprivate final class TokenStreamCreator: SyntaxVisitor {
   private var tokens = [Token]()
   private var beforeMap = [TokenSyntax: [Token]]()
   private var afterMap = [TokenSyntax: [[Token]]]()
@@ -2435,7 +2435,7 @@ private final class TokenStreamCreator: SyntaxVisitor {
   {
     let nextToken = token.nextToken
     guard let trivia = nextToken?.leadingTrivia,
-      let firstPiece = trivia[safe: 0]
+      let firstPiece = trivia.first
     else {
       return (false, [])
     }
@@ -3186,12 +3186,6 @@ class CommentMovingRewriter: SyntaxRewriter {
   }
 }
 
-extension Collection {
-  subscript(safe index: Index) -> Element? {
-    return index < endIndex ? self[index] : nil
-  }
-}
-
 extension TriviaPiece {
   /// True if the trivia piece is garbage text.
   fileprivate var isGarbageText: Bool {
@@ -3205,7 +3199,7 @@ extension TriviaPiece {
 /// Returns whether the given trivia includes a directive to ignore formatting for the next node.
 ///
 /// - Parameter trivia: Leading trivia for a node that the formatter supports ignoring.
-private func isFormatterIgnorePresent(inTrivia trivia: Trivia) -> Bool {
+fileprivate func isFormatterIgnorePresent(inTrivia trivia: Trivia) -> Bool {
   func isFormatterIgnore(in commentText: String, prefix: String, suffix: String) -> Bool {
     let trimmed =
       commentText.dropFirst(prefix.count)
@@ -3237,7 +3231,7 @@ private func isFormatterIgnorePresent(inTrivia trivia: Trivia) -> Bool {
 /// be safely ignored.
 ///
 /// - Parameter node: A node that can be safely ignored.
-private func shouldFormatterIgnore(node: Syntax) -> Bool {
+fileprivate func shouldFormatterIgnore(node: Syntax) -> Bool {
   // Regardless of the level of nesting, if the ignore directive is present on the first token
   // contained within the node then the entire node is eligible for ignoring.
   if let firstTrivia = node.firstToken?.leadingTrivia {

Sources/SwiftFormatRules/AddModifierRewriter.swift

@@ -10,12 +10,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import SwiftFormatCore
 import SwiftSyntax
 
-private final class AddModifierRewriter: SyntaxRewriter {
-  let modifierKeyword: DeclModifierSyntax
+fileprivate final class AddModifierRewriter: SyntaxRewriter {
+  private let modifierKeyword: DeclModifierSyntax
 
   init(modifierKeyword: DeclModifierSyntax) {
     self.modifierKeyword = modifierKeyword
@@ -162,7 +161,7 @@ private final class AddModifierRewriter: SyntaxRewriter {
   /// this method does nothing and returns the given node as-is.
   /// - Parameter node: A node that was updated to include a new modifier.
   /// - Parameter modifiersProvider: A closure that returns all modifiers for the given node.
-  func nodeByRelocatingTrivia<NodeType: DeclSyntaxProtocol>(
+  private func nodeByRelocatingTrivia<NodeType: DeclSyntaxProtocol>(
     in node: NodeType,
     for modifiersProvider: (NodeType) -> ModifierListSyntax?
   ) -> NodeType {

Sources/SwiftFormatRules/AllPublicDeclarationsHaveDocumentation.swift

@@ -10,7 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import SwiftFormatCore
 import SwiftSyntax
 
@@ -65,7 +64,7 @@ public final class AllPublicDeclarationsHaveDocumentation: SyntaxLintRule {
     return .skipChildren
   }
 
-  func diagnoseMissingDocComment(
+  private func diagnoseMissingDocComment(
     _ decl: DeclSyntax,
     name: String,
     modifiers: ModifierListSyntax?
@@ -83,7 +82,7 @@ public final class AllPublicDeclarationsHaveDocumentation: SyntaxLintRule {
 }
 
 extension Diagnostic.Message {
-  static func declRequiresComment(_ name: String) -> Diagnostic.Message {
+  public static func declRequiresComment(_ name: String) -> Diagnostic.Message {
     return .init(.warning, "add a documentation comment for '\(name)'")
   }
 }

Sources/SwiftFormatRules/AlwaysUseLowerCamelCase.swift

@@ -10,7 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import SwiftFormatCore
 import SwiftSyntax
 
@@ -41,7 +40,7 @@ public final class AlwaysUseLowerCamelCase: SyntaxLintRule {
     return .skipChildren
   }
 
-  func diagnoseLowerCamelCaseViolations(_ identifier: TokenSyntax) {
+  private func diagnoseLowerCamelCaseViolations(_ identifier: TokenSyntax) {
     guard case .identifier(let text) = identifier.tokenKind else { return }
     if text.isEmpty { return }
     if text.dropFirst().contains("_") || ("A"..."Z").contains(text.first!) {
@@ -53,7 +52,7 @@ public final class AlwaysUseLowerCamelCase: SyntaxLintRule {
 }
 
 extension Diagnostic.Message {
-  static func variableNameMustBeLowerCamelCase(_ name: String) -> Diagnostic.Message {
+  public static func variableNameMustBeLowerCamelCase(_ name: String) -> Diagnostic.Message {
     return .init(.warning, "rename variable '\(name)' using lower-camel-case")
   }
 }