Merge pull request #550 from allevato/backdeploy

Fix formatting of `@backDeploy` attribute.

Author: allevato

Sources/SwiftFormatPrettyPrint/TokenStreamCreator.swift

@@ -1783,13 +1783,29 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
     return .visitChildren
   }
 
+  override func visit(_ node: AvailabilityVersionRestrictionListSyntax)
+    -> SyntaxVisitorContinueKind
+  {
+    insertTokens(.break(.same, size: 1), betweenElementsOf: node)
+    return .visitChildren
+  }
+
   override func visit(_ node: AvailabilityVersionRestrictionSyntax) -> SyntaxVisitorContinueKind {
     before(node.firstToken(viewMode: .sourceAccurate), tokens: .open)
     after(node.platform, tokens: .break(.continue, size: 1))
     after(node.lastToken(viewMode: .sourceAccurate), tokens: .close)
     return .visitChildren
   }
 
+  override func visit(_ node: BackDeployedAttributeSpecListSyntax) -> SyntaxVisitorContinueKind {
+    before(
+      node.platforms.firstToken(viewMode: .sourceAccurate),
+      tokens: .break(.open, size: 1), .open(argumentListConsistency()))
+    after(
+      node.platforms.lastToken(viewMode: .sourceAccurate), tokens: .break(.close, size: 0), .close)
+    return .visitChildren
+  }
+
   override func visit(_ node: ConditionElementSyntax) -> SyntaxVisitorContinueKind {
     before(node.firstToken(viewMode: .sourceAccurate), tokens: .open)
     if let comma = node.trailingComma {

Tests/SwiftFormatPrettyPrintTests/BackDeployAttributeTests.swift

@@ -0,0 +1,53 @@
+final class BackDeployAttributeTests: PrettyPrintTestCase {
+  func testSpacingAndWrapping() {
+    let input =
+      """
+      @backDeployed(before:iOS 17)
+      public func hello() {}
+
+      @backDeployed(before:iOS  17,macOS   14)
+      public func hello() {}
+
+      @backDeployed(before:iOS  17,macOS   14,tvOS     17)
+      public func hello() {}
+      """
+
+    let expected80 =
+      """
+      @backDeployed(before: iOS 17)
+      public func hello() {}
+
+      @backDeployed(before: iOS 17, macOS 14)
+      public func hello() {}
+
+      @backDeployed(before: iOS 17, macOS 14, tvOS 17)
+      public func hello() {}
+
+      """
+
+    assertPrettyPrintEqual(input: input, expected: expected80, linelength: 80)
+
+    let expected28 =
+      """
+      @backDeployed(
+        before: iOS 17
+      )
+      public func hello() {}
+
+      @backDeployed(
+        before: iOS 17, macOS 14
+      )
+      public func hello() {}
+
+      @backDeployed(
+        before:
+          iOS 17, macOS 14,
+          tvOS 17
+      )
+      public func hello() {}
+
+      """
+
+    assertPrettyPrintEqual(input: input, expected: expected28, linelength: 28)
+  }
+}