Modern Swift concurrency

CHANGELOG.md

@@ -1,5 +1,24 @@
 # Change Log
 
+## [1.1.0] - 2026-06-26
+
+### Changed
+
+- Adopted Swift's Approachable Concurrency upcoming features
+  (`NonisolatedNonsendingByDefault` and `InferIsolatedConformances`). The public
+  `async` entry points (`CIFP(url:)`, `CIFP(bytes:)`, and `linked()`) now run on
+  the caller's executor by default, and the streaming line readers are annotated
+  `@concurrent` so file and byte iteration keep running off the caller's
+  executor. No public signatures changed.
+
+### Internal
+
+- Removed the remaining `nonisolated(unsafe)` escape hatches: the two
+  header-parsing regexes are now compiled once per parse on the builder instead
+  of stored as shared unsafe statics.
+- Dropped a vestigial `@preconcurrency` from `import RegexBuilder`; the module is
+  fully `Sendable`-audited under Swift 6.
+
 ## [1.0.0] - 2026-01-17
 
 Initial release.

Package.swift

@@ -3,6 +3,11 @@
 
 import PackageDescription
 
+let approachableConcurrency: [SwiftSetting] = [
+  .enableUpcomingFeature("NonisolatedNonsendingByDefault"),
+  .enableUpcomingFeature("InferIsolatedConformances")
+]
+
 let package = Package(
   name: "SwiftCIFP",
   defaultLocalization: "en",
@@ -22,11 +27,13 @@ let package = Package(
   targets: [
     .target(
       name: "SwiftCIFP",
-      resources: [.process("Resources")]
+      resources: [.process("Resources")],
+      swiftSettings: approachableConcurrency
     ),
     .testTarget(
       name: "SwiftCIFPTests",
-      dependencies: ["SwiftCIFP"]
+      dependencies: ["SwiftCIFP"],
+      swiftSettings: approachableConcurrency
     )
   ],
   swiftLanguageModes: [.v5, .v6]
@@ -41,7 +48,8 @@ let package = Package(
         .product(name: "ArgumentParser", package: "swift-argument-parser"),
         .product(name: "ZIPFoundation", package: "ZIPFoundation"),
         .product(name: "Progress", package: "Progress.swift")
-      ]
+      ],
+      swiftSettings: approachableConcurrency
     )
   )
 #endif

Sources/SwiftCIFP/CIFP.swift

@@ -3,7 +3,7 @@ import Foundation
 #if canImport(CoreLocation)
   import CoreLocation
 #endif
-@preconcurrency import RegexBuilder
+import RegexBuilder
 
 /// Container for CIFP (Coded Instrument Flight Procedures) data.
 ///
@@ -361,32 +361,34 @@ func expandRunwayTransitionId(_ transitionId: String) -> [String] {
 
 /// Builder for aggregating parsed records into CIFP.
 private struct CIFPBuilder {
-  // MARK: - Static Regex Patterns
+  // MARK: - Date Parsing
+
+  /// Parses the creation date from HDR01.
+  private static let creationDateFormatter: DateFormatter = {
+    let formatter = DateFormatter()
+    formatter.dateFormat = "dd-MMM-yyyy"
+    formatter.locale = Locale(identifier: "en_US_POSIX")
+    return formatter
+  }()
+
+  // MARK: - Header-Parsing Patterns
 
   /// Matches "VOLUME" followed by whitespace and a 4-digit cycle number.
-  nonisolated(unsafe) private static let volumeCycleRegex = Regex {
+  private let volumeCycleRegex = Regex {
     "VOLUME"
     OneOrMore(.whitespace)
     Capture { Repeat(.digit, count: 4) }
   }
 
   /// Matches a date in DD-MMM-YYYY format (e.g., "15-JAN-2024").
-  nonisolated(unsafe) private static let creationDateRegex = Regex {
+  private let creationDateRegex = Regex {
     Repeat(.digit, count: 2)
     "-"
     Repeat("A"..."Z", count: 3)
     "-"
     Repeat(.digit, count: 4)
   }
 
-  /// Parses the creation date from HDR01.
-  private static let creationDateFormatter: DateFormatter = {
-    let formatter = DateFormatter()
-    formatter.dateFormat = "dd-MMM-yyyy"
-    formatter.locale = Locale(identifier: "en_US_POSIX")
-    return formatter
-  }()
-
   var headerRecords: [HeaderRecord] = []
   var gridMORAs: [GridMORA] = []
   var vhfNavaids: [String: VHFNavaid] = [:]
@@ -569,7 +571,7 @@ private struct CIFPBuilder {
     }
     // Fall back to looking for "VOLUME XXXX" pattern
     for text in headerText {
-      guard let match = text.firstMatch(of: Self.volumeCycleRegex) else { continue }
+      guard let match = text.firstMatch(of: volumeCycleRegex) else { continue }
       let cycleStr = String(match.1)
       guard let c = Cycle(yymm: cycleStr) else { continue }
       return c
@@ -1080,7 +1082,7 @@ private struct CIFPBuilder {
 
   private func parseCreationDate(from hdr01: String) -> DateComponents? {
     // Look for DD-MMM-YYYY pattern
-    guard let match = hdr01.firstMatch(of: Self.creationDateRegex) else {
+    guard let match = hdr01.firstMatch(of: creationDateRegex) else {
       return nil
     }
     let dateStr = String(match.0)

Sources/SwiftCIFP/Parser/CIFPLineReader.swift

@@ -171,6 +171,7 @@ where Source.Element == UInt8, Source: Sendable {
       lineBuffer.reserveCapacity(lineBufferCapacity)
     }
 
+    @concurrent
     mutating func next() async throws -> [UInt8]? {
       lineBuffer.removeAll(keepingCapacity: true)