[Syntax] Fix TriviaPiece.isNewline

CodeGeneration/Sources/SyntaxSupport/Trivia.swift

@@ -12,27 +12,38 @@
 
 import SwiftSyntax
 
+public struct TriviaTraits: OptionSet {
+  public var rawValue: UInt8
+
+  public init(rawValue: UInt8) {
+    self.rawValue = rawValue
+  }
+
+  // Indicates this is a whitespace.
+  public static var whitespace: Self { .init(rawValue: 1 << 0) }
+
+  // Indicates a newline in Swift source code.
+  public static var newline: Self { .init(rawValue: 1 << 1) }
+
+  // Horizontal space.
+  public static var spaceOrTab: Self { .init(rawValue: 1 << 2) }
+
+  // Comment in Swift source code.
+  public static var comment: Self { .init(rawValue: 1 << 3) }
+}
+
 public class Trivia {
   /// The name of the trivia.
   public let name: TokenSyntax
 
   /// The doc comment describing the trivia.
   public let comment: SwiftSyntax.Trivia
 
-  /// The list of characters that make up the trivia.
-  ///
-  /// Useful for multi-character trivias like `\r\n`.
-  public let characters: [Character]
-
-  /// The list of characters as they would appear in Swift code.
-  ///
-  /// This might differ from `characters` due to Swift's character escape requirements.
-  public let swiftCharacters: [Character]
+  /// The characters that make up the trivia.
+  public let characters: String?
 
-  /// Indicates if the trivia represents a comment.
-  ///
-  /// If `true`, the trivia is some form of a comment in the Swift code.
-  public let isComment: Bool
+  /// The traits.
+  public let traits: TriviaTraits
 
   /// The name of the trivia in lowercase.
   public var lowerName: TokenSyntax { .identifier(lowercaseFirstWord(name: name.text)) }
@@ -52,168 +63,109 @@ public class Trivia {
     }
   }
 
-  /// The length of the `characters` array.
-  public var charactersLen: Int { characters.count }
-
   /// Indicates if the trivia is a collection of characters.
   ///
   /// If `true`, the trivia is made up of multiple characters.
-  public var isCollection: Bool { charactersLen > 0 }
-
-  /// Indicates if the trivia contains only whitespace characters.
-  public var isBlank: Bool {
-    characters.contains { $0.isWhitespace }
-  }
-
-  /// Indicates if the trivia contains newline characters.
-  public var isNewLine: Bool {
-    characters.contains { $0.isNewline }
-  }
+  public var isCollection: Bool { characters != nil }
 
   /// Initializes a new `Trivia` instance.
   ///
   /// - Parameters:
   ///   - name: A name of the trivia.
   ///   - comment: A doc comment describing the trivia.
   ///   - characters: A list of characters that make up the trivia.
-  ///   - swiftCharacters: A list of characters as they would appear in Swift code.
   ///   - isComment: Indicates if the trivia represents a comment.
   init(
     name: TokenSyntax,
     comment: SwiftSyntax.Trivia,
-    characters: [Character] = [],
-    swiftCharacters: [Character] = [],
-    isComment: Bool = false
+    characters: String? = nil,
+    traits: TriviaTraits = []
   ) {
     self.name = name
     self.comment = comment
-    self.isComment = isComment
     self.characters = characters
-
-    // Swift sometimes doesn't support escaped characters like \f or \v;
-    // we should allow specifying alternatives explicitly.
-    if !swiftCharacters.isEmpty {
-      self.swiftCharacters = swiftCharacters
-    } else {
-      self.swiftCharacters = characters
-    }
+    self.traits = traits
   }
 }
 
 public let TRIVIAS: [Trivia] = [
   Trivia(
     name: "Backslash",
     comment: #"A backslash that is at the end of a line in a multi-line string literal to escape the newline."#,
-    characters: [
-      Character("\\")
-    ],
-    swiftCharacters: [
-      Character("\\")
-    ]
+    characters: "\\"
   ),
 
   Trivia(
     name: "BlockComment",
     comment: #"A developer block comment, starting with '/*' and ending with '*/'."#,
-    isComment: true
+    traits: [.comment]
   ),
 
   Trivia(
     name: "CarriageReturn",
     comment: #"A newline '\r' character."#,
-    characters: [
-      Character("\r")
-    ],
-    swiftCharacters: [
-      Character("\r")
-    ]
+    characters: "\r",
+    traits: [.whitespace, .newline]
   ),
 
   Trivia(
     name: "CarriageReturnLineFeed",
     comment: #"A newline consists of contiguous '\r' and '\n' characters."#,
-    characters: [
-      Character("\r"),
-      Character("\n"),
-    ],
-    swiftCharacters: [
-      Character("\r"),
-      Character("\n"),
-    ]
+    characters: "\r\n",
+    traits: [.whitespace, .newline]
   ),
 
   Trivia(
     name: "DocBlockComment",
     comment: #"A documentation block comment, starting with '/**' and ending with '*/'."#,
-    isComment: true
+    traits: [.comment]
   ),
 
   Trivia(
     name: "DocLineComment",
     comment: #"A documentation line comment, starting with '///' and excluding the trailing newline."#,
-    isComment: true
+    traits: [.comment]
   ),
 
   // Swift don't support form feed '\f' so we use the raw unicode
   Trivia(
     name: "Formfeed",
     comment: #"A form-feed 'f' character."#,
-    characters: [
-      Character("\u{c}")
-    ],
-    swiftCharacters: [
-      Character("\u{240C}")
-    ]
+    characters: "\u{000C}",
+    traits: [.whitespace]
   ),
 
   Trivia(
     name: "LineComment",
     comment: #"A developer line comment, starting with '//' and excluding the trailing newline."#,
-    isComment: true
+    traits: [.comment]
   ),
 
   Trivia(
     name: "Newline",
     comment: #"A newline '\n' character."#,
-    characters: [
-      Character("\n")
-    ],
-    swiftCharacters: [
-      Character("\n")
-    ]
+    characters: "\n",
+    traits: [.whitespace, .newline]
   ),
 
   Trivia(
     name: "Pound",
     comment: #"A '#' that is at the end of a line in a multi-line string literal to escape the newline."#,
-    characters: [
-      Character("#")
-    ],
-    swiftCharacters: [
-      Character("#")
-    ]
+    characters: "#"
   ),
 
   Trivia(
     name: "Space",
     comment: #"A space ' ' character."#,
-    characters: [
-      Character(" ")
-    ],
-    swiftCharacters: [
-      Character(" ")
-    ]
+    characters: " ",
+    traits: [.whitespace, .spaceOrTab]
   ),
 
   Trivia(
     name: "Tab",
     comment: #"A tab '\t' character."#,
-    characters: [
-      Character("\t")
-    ],
-    swiftCharacters: [
-      Character("\t")
-    ]
+    characters: "\t",
+    traits: [.whitespace, .spaceOrTab]
   ),
 
   Trivia(
@@ -225,11 +177,7 @@ public let TRIVIAS: [Trivia] = [
   Trivia(
     name: "VerticalTab",
     comment: #"A vertical tab '\v' character."#,
-    characters: [
-      Character("\u{b}")
-    ],
-    swiftCharacters: [
-      Character("\u{2B7F}")
-    ]
+    characters: "\u{000B}",
+    traits: [.whitespace]
   ),
 ]