Extract SupportedLanguageExtension into separate file

Author: mattt

Sources/PackageModel/CMakeLists.txt

@@ -17,6 +17,7 @@ add_library(PackageModel
   Resource.swift
   Sources.swift
   Target.swift
+  SupportedLanguageExtension.swift
   SwiftLanguageVersion.swift
   ToolsVersion.swift)
 target_link_libraries(PackageModel PUBLIC

Sources/PackageModel/Sources.swift

@@ -50,66 +50,3 @@ public struct Sources: Codable {
         })
     }
 }
-
-/// An enum representing supported source file extensions.
-public enum SupportedLanguageExtension: String {
-    /// Swift
-    case swift
-    /// C
-    case c
-    /// Objective C
-    case m
-    /// Objective-C++
-    case mm
-    /// C++
-    case cc
-    case cpp
-    case cxx
-    /// Assembly
-    case s
-    case S
-
-    /// Returns a set of valid swift extensions.
-    public static var swiftExtensions: Set<String> = {
-        SupportedLanguageExtension.stringSet(swift)
-    }()
-
-    /// Returns a set of valid c extensions.
-    public static var cExtensions: Set<String> = {
-        SupportedLanguageExtension.stringSet(c, m)
-    }()
-
-    /// Returns a set of valid cpp extensions.
-    public static var cppExtensions: Set<String> = {
-        SupportedLanguageExtension.stringSet(mm, cc, cpp, cxx)
-    }()
-
-    /// Returns a set of valid assembly file extensions.
-    public static var assemblyExtensions: Set<String> = {
-        SupportedLanguageExtension.stringSet(.s, .S)
-    }()
-
-    /// Returns a set of valid extensions in clang targets.
-    public static func clangTargetExtensions(toolsVersion: ToolsVersion) -> Set<String> {
-        var validExts = cExtensions.union(cppExtensions)
-        if toolsVersion >= .v5 {
-            validExts.formUnion(assemblyExtensions)
-        }
-        return validExts
-    }
-
-    /// Returns a set of all file extensions we support.
-    public static func validExtensions(toolsVersion: ToolsVersion) -> Set<String> {
-        return swiftExtensions.union(clangTargetExtensions(toolsVersion: toolsVersion))
-    }
-
-    /// Converts array of LanguageExtension into a string set representation.
-    ///
-    /// - Parameters:
-    ///     - extensions: Array of LanguageExtension to be converted to string set.
-    ///
-    /// - Returns: Set of strings.
-    private static func stringSet(_ extensions: SupportedLanguageExtension...) -> Set<String> {
-        return Set(extensions.map({ $0.rawValue }))
-    }
-}

Sources/PackageModel/SupportedLanguageExtension.swift

@@ -0,0 +1,72 @@
+/*
+ This source file is part of the Swift.org open source project
+
+ Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
+ Licensed under Apache License v2.0 with Runtime Library Exception
+
+ See http://swift.org/LICENSE.txt for license information
+ See http://swift.org/CONTRIBUTORS.txt for Swift project authors
+*/
+
+/// An enum representing supported source file extensions.
+public enum SupportedLanguageExtension: String {
+    /// Swift
+    case swift
+    /// C
+    case c
+    /// Objective C
+    case m
+    /// Objective-C++
+    case mm
+    /// C++
+    case cc
+    case cpp
+    case cxx
+    /// Assembly
+    case s
+    case S
+
+    /// Returns a set of valid swift extensions.
+    public static var swiftExtensions: Set<String> = {
+        SupportedLanguageExtension.stringSet(swift)
+    }()
+
+    /// Returns a set of valid c extensions.
+    public static var cExtensions: Set<String> = {
+        SupportedLanguageExtension.stringSet(c, m)
+    }()
+
+    /// Returns a set of valid cpp extensions.
+    public static var cppExtensions: Set<String> = {
+        SupportedLanguageExtension.stringSet(mm, cc, cpp, cxx)
+    }()
+
+    /// Returns a set of valid assembly file extensions.
+    public static var assemblyExtensions: Set<String> = {
+        SupportedLanguageExtension.stringSet(.s, .S)
+    }()
+
+    /// Returns a set of valid extensions in clang targets.
+    public static func clangTargetExtensions(toolsVersion: ToolsVersion) -> Set<String> {
+        var validExts = cExtensions.union(cppExtensions)
+        if toolsVersion >= .v5 {
+            validExts.formUnion(assemblyExtensions)
+        }
+        return validExts
+    }
+
+    /// Returns a set of all file extensions we support.
+    public static func validExtensions(toolsVersion: ToolsVersion) -> Set<String> {
+        return swiftExtensions.union(clangTargetExtensions(toolsVersion: toolsVersion))
+    }
+
+    /// Converts array of LanguageExtension into a string set representation.
+    ///
+    /// - Parameters:
+    ///     - extensions: Array of LanguageExtension to be converted to string set.
+    ///
+    /// - Returns: Set of strings.
+    private static func stringSet(_ extensions: SupportedLanguageExtension...) -> Set<String> {
+        return Set(extensions.map({ $0.rawValue }))
+    }
+}