[5.10] Add fixes that were present in 509.0.0 but not release/5.10

Documentation/Configuration.md

@@ -82,6 +82,9 @@ top-level keys and values:
 *  `spacesAroundRangeFormationOperators` _(boolean)_: Determines whether whitespace should be forced
    before and after the range formation operators `...` and `..<`.
 
+*  `multiElementCollectionTrailingCommas` _(boolean)_: Determines whether multi-element collection literals should have trailing commas.
+    Defaults to `true`.
+
 > TODO: Add support for enabling/disabling specific syntax transformations in
 > the pipeline.
 

Package.swift

@@ -154,7 +154,7 @@ if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
     ),
     .package(
       url: "https://github.com/apple/swift-syntax.git",
-      branch: "main"
+      branch: "release/5.10"
     ),
   ]
 } else {

Sources/SwiftFormat/API/Configuration+Default.swift

@@ -37,5 +37,6 @@ extension Configuration {
     self.indentSwitchCaseLabels = false
     self.spacesAroundRangeFormationOperators = false
     self.noAssignmentInExpressions = NoAssignmentInExpressionsConfiguration()
+    self.multiElementCollectionTrailingCommas = true
   }
 }

Sources/SwiftFormat/API/Configuration.swift

@@ -42,6 +42,7 @@ public struct Configuration: Codable, Equatable {
     case rules
     case spacesAroundRangeFormationOperators
     case noAssignmentInExpressions
+    case multiElementCollectionTrailingCommas
   }
 
   /// A dictionary containing the default enabled/disabled states of rules, keyed by the rules'
@@ -162,6 +163,29 @@ public struct Configuration: Codable, Equatable {
   /// Contains exceptions for the `NoAssignmentInExpressions` rule.
   public var noAssignmentInExpressions: NoAssignmentInExpressionsConfiguration
 
+  /// Determines if multi-element collection literals should have trailing commas.
+  ///
+  /// When `true` (default), the correct form is:
+  /// ```swift
+  /// let MyCollection = [1, 2,]
+  /// ...
+  /// let MyCollection = [
+  ///   "a": 1,
+  ///   "b": 2,
+  /// ]
+  /// ```
+  ///
+  /// When `false`, the correct form is:
+  /// ```swift
+  /// let MyCollection = [1, 2]
+  /// ...
+  /// let MyCollection = [
+  ///   "a": 1,
+  ///   "b": 2
+  /// ]
+  /// ```
+  public var multiElementCollectionTrailingCommas: Bool
+
   /// Constructs a Configuration by loading it from a configuration file.
   public init(contentsOf url: URL) throws {
     let data = try Data(contentsOf: url)
@@ -239,6 +263,10 @@ public struct Configuration: Codable, Equatable {
       try container.decodeIfPresent(
         NoAssignmentInExpressionsConfiguration.self, forKey: .noAssignmentInExpressions)
       ?? defaults.noAssignmentInExpressions
+    self.multiElementCollectionTrailingCommas =
+      try container.decodeIfPresent(
+        Bool.self, forKey: .multiElementCollectionTrailingCommas)
+    ?? defaults.multiElementCollectionTrailingCommas
 
     // If the `rules` key is not present at all, default it to the built-in set
     // so that the behavior is the same as if the configuration had been
@@ -271,6 +299,7 @@ public struct Configuration: Codable, Equatable {
     try container.encode(fileScopedDeclarationPrivacy, forKey: .fileScopedDeclarationPrivacy)
     try container.encode(indentSwitchCaseLabels, forKey: .indentSwitchCaseLabels)
     try container.encode(noAssignmentInExpressions, forKey: .noAssignmentInExpressions)
+    try container.encode(multiElementCollectionTrailingCommas, forKey: .multiElementCollectionTrailingCommas)
     try container.encode(rules, forKey: .rules)
   }
 

Sources/SwiftFormat/Core/ModifierListSyntax+Convenience.swift

@@ -17,7 +17,8 @@ extension DeclModifierListSyntax {
   var accessLevelModifier: DeclModifierSyntax? {
     for modifier in self {
       switch modifier.name.tokenKind {
-      case .keyword(.public), .keyword(.private), .keyword(.fileprivate), .keyword(.internal):
+      case .keyword(.public), .keyword(.private), .keyword(.fileprivate), .keyword(.internal),
+          .keyword(.package):
         return modifier
       default:
         continue

Sources/SwiftFormat/Core/Pipelines+Generated.swift

@@ -159,6 +159,7 @@ class LintPipeline: SyntaxVisitor {
   }
 
   override func visit(_ node: FunctionParameterSyntax) -> SyntaxVisitorContinueKind {
+    visitIfEnabled(AlwaysUseLiteralForEmptyCollectionInit.visit, for: node)
     visitIfEnabled(NoLeadingUnderscores.visit, for: node)
     return .visitChildren
   }
@@ -243,6 +244,7 @@ class LintPipeline: SyntaxVisitor {
   }
 
   override func visit(_ node: PatternBindingSyntax) -> SyntaxVisitorContinueKind {
+    visitIfEnabled(AlwaysUseLiteralForEmptyCollectionInit.visit, for: node)
     visitIfEnabled(OmitExplicitReturns.visit, for: node)
     visitIfEnabled(UseSingleLinePropertyGetter.visit, for: node)
     return .visitChildren
@@ -356,6 +358,7 @@ extension FormatPipeline {
 
   func rewrite(_ node: Syntax) -> Syntax {
     var node = node
+    node = AlwaysUseLiteralForEmptyCollectionInit(context: context).rewrite(node)
     node = DoNotUseSemicolons(context: context).rewrite(node)
     node = FileScopedDeclarationPrivacy(context: context).rewrite(node)
     node = FullyIndirectEnum(context: context).rewrite(node)

Sources/SwiftFormat/Core/RuleNameCache+Generated.swift

@@ -16,6 +16,7 @@
 @_spi(Testing)
 public let ruleNameCache: [ObjectIdentifier: String] = [
   ObjectIdentifier(AllPublicDeclarationsHaveDocumentation.self): "AllPublicDeclarationsHaveDocumentation",
+  ObjectIdentifier(AlwaysUseLiteralForEmptyCollectionInit.self): "AlwaysUseLiteralForEmptyCollectionInit",
   ObjectIdentifier(AlwaysUseLowerCamelCase.self): "AlwaysUseLowerCamelCase",
   ObjectIdentifier(AmbiguousTrailingClosureOverload.self): "AmbiguousTrailingClosureOverload",
   ObjectIdentifier(BeginDocumentationCommentWithOneLineSummary.self): "BeginDocumentationCommentWithOneLineSummary",

Sources/SwiftFormat/Core/RuleRegistry+Generated.swift

@@ -15,6 +15,7 @@
 @_spi(Internal) public enum RuleRegistry {
   public static let rules: [String: Bool] = [
     "AllPublicDeclarationsHaveDocumentation": false,
+    "AlwaysUseLiteralForEmptyCollectionInit": false,
     "AlwaysUseLowerCamelCase": true,
     "AmbiguousTrailingClosureOverload": true,
     "BeginDocumentationCommentWithOneLineSummary": false,

Sources/SwiftFormat/PrettyPrint/PrettyPrint.swift

@@ -557,7 +557,7 @@ public class PrettyPrinter {
       // We never want to add a trailing comma in an initializer so we disable trailing commas on
       // single element collections.
       let shouldHaveTrailingComma =
-        startLineNumber != openCloseBreakCompensatingLineNumber && !isSingleElement
+        startLineNumber != openCloseBreakCompensatingLineNumber && !isSingleElement && configuration.multiElementCollectionTrailingCommas
       if shouldHaveTrailingComma && !hasTrailingComma {
         diagnose(.addTrailingComma, category: .trailingComma)
       } else if !shouldHaveTrailingComma && hasTrailingComma {

Sources/SwiftFormat/PrettyPrint/TokenStreamCreator.swift

@@ -1799,8 +1799,23 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
 
   override func visit(_ node: AvailabilityLabeledArgumentSyntax) -> SyntaxVisitorContinueKind {
     before(node.label, tokens: .open)
-    after(node.colon, tokens: .break(.continue, newlines: .elective(ignoresDiscretionary: true)))
-    after(node.value.lastToken(viewMode: .sourceAccurate), tokens: .close)
+
+    let tokensAfterColon: [Token]
+    let endTokens: [Token]
+
+    if case .string(let string) = node.value,
+      string.openingQuote.tokenKind == .multilineStringQuote
+    {
+      tokensAfterColon =
+        [.break(.open(kind: .block), newlines: .elective(ignoresDiscretionary: true))]
+      endTokens = [.break(.close(mustBreak: false), size: 0), .close]
+    } else {
+      tokensAfterColon = [.break(.continue, newlines: .elective(ignoresDiscretionary: true))]
+      endTokens = [.close]
+    }
+
+    after(node.colon, tokens: tokensAfterColon)
+    after(node.value.lastToken(viewMode: .sourceAccurate), tokens: endTokens)
     return .visitChildren
   }
 
@@ -2293,6 +2308,7 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
 
   override func visit(_ node: GenericParameterSyntax) -> SyntaxVisitorContinueKind {
     before(node.firstToken(viewMode: .sourceAccurate), tokens: .open)
+    after(node.eachKeyword, tokens: .break)
     after(node.colon, tokens: .break)
     if let trailingComma = node.trailingComma {
       after(trailingComma, tokens: .close, .break(.same))
@@ -2312,6 +2328,28 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
     return .visitChildren
   }
 
+  override func visit(_ node: PackElementExprSyntax) -> SyntaxVisitorContinueKind {
+    // `each` cannot be separated from the following token, or it is parsed as an identifier itself.
+    after(node.eachKeyword, tokens: .space)
+    return .visitChildren
+  }
+
+  override func visit(_ node: PackElementTypeSyntax) -> SyntaxVisitorContinueKind {
+    // `each` cannot be separated from the following token, or it is parsed as an identifier itself.
+    after(node.eachKeyword, tokens: .space)
+    return .visitChildren
+  }
+
+  override func visit(_ node: PackExpansionExprSyntax) -> SyntaxVisitorContinueKind {
+    after(node.repeatKeyword, tokens: .break)
+    return .visitChildren
+  }
+
+  override func visit(_ node: PackExpansionTypeSyntax) -> SyntaxVisitorContinueKind {
+    after(node.repeatKeyword, tokens: .break)
+    return .visitChildren
+  }
+
   override func visit(_ node: ExpressionPatternSyntax) -> SyntaxVisitorContinueKind {
     return .visitChildren
   }
@@ -2353,6 +2391,16 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
     return .visitChildren
   }
 
+  override func visit(_ node: SimpleStringLiteralExprSyntax) -> SyntaxVisitorContinueKind {
+    if node.openingQuote.tokenKind == .multilineStringQuote {
+      after(node.openingQuote, tokens: .break(.same, size: 0, newlines: .hard(count: 1)))
+      if !node.segments.isEmpty {
+        before(node.closingQuote, tokens: .break(.same, newlines: .hard(count: 1)))
+      }
+    }
+    return .visitChildren
+  }
+
   override func visit(_ node: StringSegmentSyntax) -> SyntaxVisitorContinueKind {
     // Looks up the correct break kind based on prior context.
     func breakKind() -> BreakKind {
@@ -2481,6 +2529,27 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
     return .visitChildren
   }
 
+  override func visit(_ node: ConsumeExprSyntax) -> SyntaxVisitorContinueKind {
+    // The `consume` keyword cannot be separated from the following token or it will be parsed as
+    // an identifier.
+    after(node.consumeKeyword, tokens: .space)
+    return .visitChildren
+  }
+
+  override func visit(_ node: CopyExprSyntax) -> SyntaxVisitorContinueKind {
+    // The `copy` keyword cannot be separated from the following token or it will be parsed as an
+    // identifier.
+    after(node.copyKeyword, tokens: .space)
+    return .visitChildren
+  }
+
+  override func visit(_ node: DiscardStmtSyntax) -> SyntaxVisitorContinueKind {
+    // The `discard` keyword cannot be separated from the following token or it will be parsed as
+    // an identifier.
+    after(node.discardKeyword, tokens: .space)
+    return .visitChildren
+  }
+
   override func visit(_ node: InheritanceClauseSyntax) -> SyntaxVisitorContinueKind {
     // Normally, the open-break is placed before the open token. In this case, it's intentionally
     // ordered differently so that the inheritance list can start on the current line and only