Replace Unknown with Missing

Author: CodaFi

Sources/SwiftSyntax/Documentation.docc/SwiftSyntax.md.gyb

@@ -133,7 +133,6 @@ allows Swift tools to parse, inspect, generate, and transform Swift source code.
 - <doc:SwiftSyntax/${node.name}>
 %   end
 % end
-- <doc:SwiftSyntax/UnknownSyntax>
 
 ### Traits
 

Sources/SwiftSyntax/Documentation.docc/gyb_generated/SwiftSyntax.md

@@ -417,7 +417,6 @@ allows Swift tools to parse, inspect, generate, and transform Swift source code.
 - <doc:SwiftSyntax/MissingStmtSyntax>
 - <doc:SwiftSyntax/MissingTypeSyntax>
 - <doc:SwiftSyntax/MissingPatternSyntax>
-- <doc:SwiftSyntax/UnknownSyntax>
 
 ### Traits
 

Sources/SwiftSyntax/Misc.swift.gyb

@@ -22,7 +22,6 @@
 extension Syntax {
   public static var structure: SyntaxNodeStructure {
     return .choices([
-      .node(UnknownSyntax.self),
       .node(TokenSyntax.self),
 % for node in NON_BASE_SYNTAX_NODES:
 %   if node.is_base():
@@ -39,7 +38,6 @@ extension SyntaxKind {
   public var syntaxNodeType: SyntaxProtocol.Type {
     switch self {
     case .token: return TokenSyntax.self
-    case .unknown: return UnknownSyntax.self
 % for node in NON_BASE_SYNTAX_NODES:
     case .${node.swift_syntax_kind}: return ${node.name}.self
 % end
@@ -48,8 +46,6 @@ extension SyntaxKind {
 
   public var nameForDiagnostics: String? {
     switch self {
-    case .unknown:
-      return nil
     case .token:
       return "token"
 % for node in NON_BASE_SYNTAX_NODES:

Sources/SwiftSyntax/Raw/RawSyntaxValidation.swift.gyb

@@ -91,8 +91,6 @@ func validateLayout(layout: RawSyntaxBuffer, as kind: SyntaxKind) {
   }
 
   switch kind {
-  case .unknown:
-    break
   case .token:
     assertionFailure("validateLayout for .token kind is not supported")
 % for node in NON_BASE_SYNTAX_NODES:

Sources/SwiftSyntax/Raw/gyb_generated/RawSyntaxValidation.swift

@@ -85,8 +85,6 @@ func validateLayout(layout: RawSyntaxBuffer, as kind: SyntaxKind) {
   }
 
   switch kind {
-  case .unknown:
-    break
   case .token:
     assertionFailure("validateLayout for .token kind is not supported")
   case .missing:

Sources/SwiftSyntax/SyntaxAnyVisitor.swift.gyb

@@ -58,14 +58,6 @@ open class SyntaxAnyVisitor: SyntaxVisitor {
     visitAnyPost(node._syntaxNode)
   }
 
-  override open func visit(_ node: UnknownSyntax) -> SyntaxVisitorContinueKind {
-    return visitAny(node._syntaxNode)
-  }
-
-  override open func visitPost(_ node: UnknownSyntax) {
-    visitAnyPost(node._syntaxNode)
-  }
-  
 % for node in SYNTAX_NODES:
 %   if is_visitable(node):
   override open func visit(_ node: ${node.name}) -> SyntaxVisitorContinueKind {

Sources/SwiftSyntax/SyntaxEnum.swift.gyb

@@ -22,7 +22,6 @@
 /// Enum to exhaustively switch over all different syntax nodes.
 @frozen // FIXME: Not actually stable, works around a miscompile
 public enum SyntaxEnum {
-  case unknown(UnknownSyntax)
   case token(TokenSyntax)
 % for node in NON_BASE_SYNTAX_NODES:
 %   if node.is_base():
@@ -39,8 +38,6 @@ public extension Syntax {
     switch raw.kind {
     case .token:
       return .token(TokenSyntax(self)!)
-    case .unknown:
-      return .unknown(UnknownSyntax(self)!)
 % for node in NON_BASE_SYNTAX_NODES:
     case .${node.swift_syntax_kind}:
 %   if node.is_base():

Sources/SwiftSyntax/SyntaxFactory.swift.gyb

@@ -39,11 +39,6 @@ public enum SyntaxFactory {
       presence: presence)
   }
 
-  @available(*, deprecated, message: "Use initializer on UnknownSyntax")
-  public static func makeUnknownSyntax(tokens: [TokenSyntax]) -> UnknownSyntax {
-    UnknownSyntax(tokens: tokens)
-  }
-
 /// MARK: Syntax Node Creation APIs
 
 % for node in SYNTAX_NODES:

Sources/SwiftSyntax/SyntaxKind.swift.gyb

@@ -22,7 +22,6 @@
 @frozen // FIXME: Not actually stable, works around a miscompile
 public enum SyntaxKind {
   case token
-  case unknown
 % for node in NON_BASE_SYNTAX_NODES:
   case ${node.swift_syntax_kind}
 % end
@@ -34,7 +33,6 @@ public enum SyntaxKind {
     case .${node.swift_syntax_kind}: return true
 %   end
 % end
-    case .unknown: return true
     default: return false
     }
   }

Sources/SwiftSyntax/SyntaxOtherNodes.swift

@@ -10,49 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-// MARK: UnknownSyntax
-
-/// A wrapper around a raw Syntax layout.
-public struct UnknownSyntax: SyntaxProtocol, SyntaxHashable {
-  public let _syntaxNode: Syntax
-
-  public init?<S: SyntaxProtocol>(_ node: S) {
-    guard node.raw.kind == .unknown else { return nil }
-    self._syntaxNode = node._syntaxNode
-  }
-
-  /// Creates an `UnknownSyntax` node from the given `SyntaxData`. This assumes
-  /// that the `SyntaxData` is of the correct kind. If it is not, the behaviour
-  /// is undefined.
-  internal init(_ data: SyntaxData) {
-    assert(data.raw.kind == .unknown)
-    self._syntaxNode = Syntax(data)
-  }
-
-  public init(tokens: [TokenSyntax]) {
-    let data: SyntaxData = withExtendedLifetime(SyntaxArena()) { arena in
-      let raw = RawSyntax.makeLayout(kind: .unknown,
-        from: tokens.map { $0.raw }, arena: arena)
-      return SyntaxData.forRoot(raw)
-    }
-    self.init(data)
-  }
-
-  public static var structure: SyntaxNodeStructure {
-    return .layout([])
-  }
-
-  public func childNameForDiagnostics(_ index: SyntaxChildrenIndex) -> String? {
-    return nil
-  }
-}
-
-extension UnknownSyntax: CustomReflectable {
-  public var customMirror: Mirror {
-    return Mirror(self, children: [:])
-  }
-}
-
 // MARK: TokenSyntax
 
 /// A Syntax node representing a single token.