Drop foundation requirement

Package.swift

@@ -18,6 +18,7 @@ import PackageDescription
 
 let package = Package(
     name: "SemanticVersion",
+    platforms: [.macOS("13.0")],
     products: [
         .library(
             name: "SemanticVersion",

Sources/SemanticVersion/SemanticVersion+Codable.swift

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#if canImport(Foundation)
+
 import Foundation
 
 public enum SemanticVersionStrategy {
@@ -100,3 +102,5 @@ extension SemanticVersion: Codable {
         }
     }
 }
+
+#endif

Sources/SemanticVersion/SemanticVersion+LosslessStringConvertible.swift

@@ -0,0 +1,64 @@
+// Copyright Dave Verwer, Sven A. Schmidt, and other contributors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+extension SemanticVersion: LosslessStringConvertible {
+
+    /// Initialize a version from a string. Returns `nil` if the string is not a semantic version.
+    /// - Parameter string: Version string.
+    public init?(_ string: String) {
+        guard let match = string.wholeMatch(of: semVerRegex) else { return nil }
+        guard
+            let major = Int(match.major),
+            let minor = Int(match.minor),
+            let patch = Int(match.patch)
+        else { return nil }
+        self = .init(major, minor, patch,
+                     match.prerelease.map(String.init) ?? "",
+                     match.buildmetadata.map(String.init) ?? "")
+    }
+
+    public var description: String {
+        let pre = preRelease.isEmpty ? "" : "-" + preRelease
+        let bld = build.isEmpty ? "" : "+" + build
+        return "\(major).\(minor).\(patch)\(pre)\(bld)"
+    }
+}
+
+
+// Source: https://regex101.com/r/Ly7O1x/3/
+// Linked from https://semver.org
+let semVerRegex = #/
+    ^
+    v?                              # SPI extension: allow leading 'v'
+    (?<major>0|[1-9]\d*)
+    \.
+    (?<minor>0|[1-9]\d*)
+    \.
+    (?<patch>0|[1-9]\d*)
+    (?:-
+      (?<prerelease>
+        (?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)
+        (?:\.
+          (?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)
+        )
+      *)
+    )?
+    (?:\+
+      (?<buildmetadata>[0-9a-zA-Z-]+
+        (?:\.[0-9a-zA-Z-]+)
+      *)
+    )?
+    $
+    /#

Sources/SemanticVersion/SemanticVersion.swift

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import Foundation
-
 
 /// `SemanticVersion` is a struct representing a software or project version according to ["Semantic Versioning"](https://semver.org).
 ///
@@ -50,28 +48,6 @@ public struct SemanticVersion: Equatable, Hashable {
     }
 }
 
-extension SemanticVersion: LosslessStringConvertible {
-
-    /// Initialize a version from a string. Returns `nil` if the string is not a semantic version.
-    /// - Parameter string: Version string.
-    public init?(_ string: String) {
-        let groups = semVerRegex.matchGroups(string)
-        guard
-            groups.count == semVerRegex.numberOfCaptureGroups,
-            let major = Int(groups[0]),
-            let minor = Int(groups[1]),
-            let patch = Int(groups[2])
-        else { return nil }
-        self = .init(major, minor, patch, groups[3], groups[4])
-    }
-
-    public var description: String {
-        let pre = preRelease.isEmpty ? "" : "-" + preRelease
-        let bld = build.isEmpty ? "" : "+" + build
-        return "\(major).\(minor).\(patch)\(pre)\(bld)"
-    }
-}
-
 
 extension SemanticVersion: Comparable {
     public static func < (lhs: SemanticVersion, rhs: SemanticVersion) -> Bool {
@@ -140,7 +116,7 @@ extension SemanticVersion.PreReleaseIdentifier: Comparable {
 }
 
 
-extension Array: Comparable where Element == SemanticVersion.PreReleaseIdentifier {
+extension Array: @retroactive Comparable where Element == SemanticVersion.PreReleaseIdentifier {
     public static func < (lhs: Self, rhs: Self) -> Bool {
         // Per section 11.4 of the semver spec, compare left to right until a
         // difference is found.
@@ -158,60 +134,3 @@ extension Array: Comparable where Element == SemanticVersion.PreReleaseIdentifie
 #if swift(>=5.5)
 extension SemanticVersion: Sendable {}
 #endif
-
-
-// Source: https://regex101.com/r/Ly7O1x/3/
-// Linked from https://semver.org
-#if swift(>=5)
-
-let semVerRegex = NSRegularExpression(#"""
-^
-v?                              # SPI extension: allow leading 'v'
-(?<major>0|[1-9]\d*)
-\.
-(?<minor>0|[1-9]\d*)
-\.
-(?<patch>0|[1-9]\d*)
-(?:-
-  (?<prerelease>
-    (?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)
-    (?:\.
-      (?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)
-    )
-  *)
-)?
-(?:\+
-  (?<buildmetadata>[0-9a-zA-Z-]+
-    (?:\.[0-9a-zA-Z-]+)
-  *)
-)?
-$
-"""#, options: [.allowCommentsAndWhitespace])
-
-#else
-
-let semVerRegex = NSRegularExpression("""
-^
-v?                              # SPI extension: allow leading 'v'
-(?<major>0|[1-9]\\d*)
-\\.
-(?<minor>0|[1-9]\\d*)
-\\.
-(?<patch>0|[1-9]\\d*)
-(?:-
-  (?<prerelease>
-    (?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)
-    (?:\\.
-      (?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)
-    )
-  *)
-)?
-(?:\\+
-  (?<buildmetadata>[0-9a-zA-Z-]+
-    (?:\\.[0-9a-zA-Z-]+)
-  *)
-)?
-$
-""", options: [.allowCommentsAndWhitespace])
-
-#endif

Tests/SemanticVersionTests/SemanticVersionCodingTests.swift → Tests/SemanticVersionTests/SemanticVersionCodableTests.swift

@@ -1,15 +1,24 @@
+// Copyright Dave Verwer, Sven A. Schmidt, and other contributors.
 //
-//  SemanticVersionCodingTests.swift
-//  
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
 //
-//  Created by Chris Eplett on 11/3/23.
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if canImport(Foundation)
 
 import XCTest
 
 import SemanticVersion
 
-final class SemanticVersionCodingTests: XCTestCase {
+final class SemanticVersionCodableTests: XCTestCase {
     func test_defaultCodable_is_default() throws {
         XCTAssertEqual(.defaultCodable, JSONEncoder().semanticVersionEncodingStrategy)
         XCTAssertEqual(.defaultCodable, JSONDecoder().semanticVersionDecodingStrategy)
@@ -191,3 +200,5 @@ final class SemanticVersionCodingTests: XCTestCase {
         }
     }
 }
+
+#endif