Add Swift Package plugin

Documentation/Generation/README.md

@@ -0,0 +1,7 @@
+# Reference Documentation
+
+## Enums
+
+-   [Generation](enums/Generation.md)
+
+This file was generated by [SourceDocs](https://github.com/eneko/SourceDocs)

Documentation/Generation/enums/Generation.md

@@ -0,0 +1,10 @@
+**ENUM**
+
+# `Generation`
+
+A type containing the generation function for the plugin.
+
+## Methods
+### `main()`
+
+Generate the Swift code for the plugin.

Documentation/GenerationLibrary/README.md

@@ -0,0 +1,8 @@
+# Reference Documentation
+
+## Enums
+
+-   [Generation](enums/Generation.md)
+-   [Generation.GenerationError](enums/Generation.GenerationError.md)
+
+This file was generated by [SourceDocs](https://github.com/eneko/SourceDocs)

Documentation/GenerationLibrary/enums/Generation.GenerationError.md

@@ -0,0 +1,19 @@
+**ENUM**
+
+# `Generation.GenerationError`
+
+An error that occurs during code generation.
+
+## Cases
+### `missingTranslationInDefaultLanguage(key:)`
+
+A translation in the default language missing for a specific key.
+Missing translations in other languages will cause the default language to be used.
+
+### `unknownYMLPasingError`
+
+An unknown error occured while parsing the YML.
+
+### `missingDefaultLanguage`
+
+The default language information is missing.

Documentation/GenerationLibrary/enums/Generation.md

@@ -0,0 +1,81 @@
+**ENUM**
+
+# `Generation`
+
+Generate the Swift code for the plugin and macro.
+
+## Properties
+### `indentOne`
+
+Number of spaces for indentation 1.
+
+### `indentTwo`
+
+Number of spaces for indentation 2.
+
+### `indentThree`
+
+Number of spaces for indentation 3.
+
+## Methods
+### `getCode(yml:)`
+
+Get the Swift code for the plugin and macro.
+- Parameter yml: The YML code.
+- Returns: The code.
+
+### `generateEnumCases(dictionary:)`
+
+Generate the cases for the `Localized` enumeration.
+- Parameter dictionary: The parsed YML.
+- Returns: The syntax.
+
+### `generateStaticLocVariables(dictionary:)`
+
+Generate the static variables and functions for the `Loc` type.
+- Parameter dictionary: The parsed YML.
+- Returns: The syntax.
+
+### `generateTranslations(dictionary:defaultLanguage:)`
+
+Generate the variables for the translations.
+- Parameters:
+    - dictionary: The parsed YML.
+    - defaultLanguage: The default language.
+- Returns: The syntax.
+
+### `generateLanguageFunction(dictionary:defaultLanguage:)`
+
+Generate the function for getting the translated string for a specified language code.
+- Parameters:
+    - dictionary: The parsed YML.
+    - defaultLanguage: The default language.
+- Returns: The syntax.
+
+### `getLanguages(dictionary:)`
+
+Get the available languages.
+- Parameter dictionary: The parsed YML.
+- Returns: The syntax
+
+### `parse(key:)`
+
+Parse the key for a phrase.
+- Parameter key: The key definition including parameters.
+- Returns: The key.
+
+### `parse(translation:arguments:)`
+
+Parse the translation for a phrase.
+- Parameters:
+    - translation: The translation without correct escaping.
+    - arguments: The arguments.
+- Returns: The syntax.
+
+### `indent(_:by:)`
+
+Indent each line of a text by a certain amount of whitespaces.
+- Parameters:
+    - string: The text.
+    - count: The indentation.
+- Returns: The syntax.

Documentation/LocalizedMacros/structs/LocalizedMacro.md

@@ -8,19 +8,6 @@ Access a specific language using `Localized.key.language`, or use `Localized.key
 which automatically uses the system language on Linux, macOS and Windows.
 Use `Loc.key` for a quick access to the automatically localized value.
 
-## Properties
-### `indentOne`
-
-Number of spaces for indentation 1.
-
-### `indentTwo`
-
-Number of spaces for indentation 2.
-
-### `indentThree`
-
-Number of spaces for indentation 3.
-
 ## Methods
 ### `expansion(of:in:)`
 
@@ -29,57 +16,3 @@ Expand the `localized` macro.
     - node: Information about the macro call.
     - context: The expansion context.
 - Returns: The enumerations `Localized` and `Loc`.
-
-### `generateEnumCases(dictionary:)`
-
-Generate the cases for the `Localized` enumeration.
-- Parameter dictionary: The parsed YML.
-- Returns: The syntax.
-
-### `generateStaticLocVariables(dictionary:)`
-
-Generate the static variables and functions for the `Loc` type.
-- Parameter dictionary: The parsed YML.
-- Returns: The syntax.
-
-### `generateTranslations(dictionary:)`
-
-Generate the variables for the translations.
-- Parameter dictionary: The parsed YML.
-- Returns: The syntax.
-
-### `generateLanguageFunction(dictionary:defaultLanguage:)`
-
-Generate the function for getting the translated string for a specified language code.
-- Parameters:
-    - dictionary: The parsed YML.
-    - defaultLanguage: The syntax for the default language.
-- Returns: The syntax.
-
-### `getLanguages(dictionary:)`
-
-Get the available languages.
-- Parameter dictionary: The parsed YML.
-- Returns: The syntax
-
-### `parse(key:)`
-
-Parse the key for a phrase.
-- Parameter key: The key definition including parameters.
-- Returns: The key.
-
-### `parse(translation:arguments:)`
-
-Parse the translation for a phrase.
-- Parameters:
-    - translation: The translation without correct escaping.
-    - arguments: The arguments.
-- Returns: The syntax.
-
-### `indent(_:by:)`
-
-Indent each line of a text by a certain amount of whitespaces.
-- Parameters:
-    - string: The text.
-    - count: The indentation.
-- Returns: The syntax.

Documentation/README.md

@@ -7,3 +7,11 @@ Find documentation for the `localized` macro [here](LocalizedMacros/README.md).
 ## Localized
 
 Find documentation for the `System` enumeration [here](Localized/README.md).
+
+## Generation
+
+Find documentation for the generation executable used by the plugin [here](Generation/README.md).
+
+## GenerationLibrary
+
+Find documentation for the generation used by the plugin and macro [here](GenerationLibrary/README.md).

Makefile

@@ -1,6 +1,8 @@
 docs:
 	@sourcedocs generate --min-acl private -r --spm-module Localized --output-folder Documentation/Localized
 	@sourcedocs generate --min-acl private -r --spm-module LocalizedMacros --output-folder Documentation/LocalizedMacros
+	@sourcedocs generate --min-acl private -r --spm-module Generation --output-folder Documentation/Generation
+	@sourcedocs generate --min-acl private -r --spm-module GenerationLibrary --output-folder Documentation/GenerationLibrary
 
 swiftlint:
 	@swiftlint --autocorrect

Package.swift

@@ -17,6 +17,10 @@ let package = Package(
         .library(
             name: "Localized",
             targets: ["Localized"]
+        ),
+        .plugin(
+            name: "GenerateLocalized",
+            targets: ["GenerateLocalized"]
         )
     ],
     dependencies: [
@@ -25,13 +29,32 @@ let package = Package(
         .package(url: "https://github.com/stackotter/swift-macro-toolkit", from: "0.3.1")
     ],
     targets: [
+        .target(
+            name: "GenerationLibrary",
+            dependencies: [
+                .product(name: "Yams", package: "Yams")
+            ]
+        ),
+        .executableTarget(
+            name: "Generation",
+            dependencies: [
+                "GenerationLibrary"
+            ]
+        ),
         .macro(
             name: "LocalizedMacros",
             dependencies: [
                 .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
                 .product(name: "MacroToolkit", package: "swift-macro-toolkit"),
                 .product(name: "SwiftCompilerPlugin", package: "swift-syntax"),
-                .product(name: "Yams", package: "Yams")
+                "GenerationLibrary"
+            ]
+        ),
+        .plugin(
+            name: "GenerateLocalized",
+            capability: .buildTool(),
+            dependencies: [
+                "Generation"
             ]
         ),
         .target(
@@ -41,11 +64,24 @@ let package = Package(
             ]
         ),
         .executableTarget(
-            name: "LocalizedTests",
+            name: "MacroTests",
             dependencies: [
                 "Localized"
             ],
-            path: "Tests"
+            path: "Tests/MacroTests"
+        ),
+        .executableTarget(
+            name: "PluginTests",
+            dependencies: [
+                "Localized"
+            ],
+            path: "Tests/PluginTests",
+            resources: [
+                .process("Localized.yml")
+            ],
+            plugins: [
+                "GenerateLocalized"
+            ]
         )
     ]
 )

Plugins/GenerateLocalized/Plugin.swift

@@ -0,0 +1,39 @@
+//
+//  Plugin.swift
+//  Localized
+//
+//  Created by david-swift on 02.03.24.
+//
+
+import Foundation
+import PackagePlugin
+
+/// The build tool plugin for generating Swift code from the `Localized.yml` file.
+@main
+struct Plugin: BuildToolPlugin {
+
+    /// Create the commands for generating the code.
+    /// - Parameters:
+    ///     - context: The plugin context.
+    ///     - target: The target.
+    /// - Returns: The commands.
+    func createBuildCommands(context: PluginContext, target: Target) throws -> [Command] {
+        guard let target = target.sourceModule,
+        let inputFile = target.sourceFiles.first(
+            where: { ["Localized.yml", "Localized.yaml"].contains($0.path.lastComponent) }
+        ) else {
+            return []
+        }
+        let outputFile = context.pluginWorkDirectory.appending(subpath: "Localized.swift")
+        return [
+            .buildCommand(
+                displayName: "Generating Localized.swift",
+                executable: try context.tool(named: "Generation").path,
+                arguments: [inputFile.path.string, outputFile.string],
+                inputFiles: [inputFile.path],
+                outputFiles: [outputFile]
+            )
+        ]
+    }
+
+}

README.md

@@ -13,7 +13,7 @@
   </a>
 </p>
 
-_Localized_ provides a macro for localizing cross-platform Swift code.
+_Localized_ provides a Swift package plugin for localizing cross-platform Swift code.
 
 Use YML syntax for defining available phrases:
 
@@ -60,7 +60,44 @@ print(Localized.house.fr)
 
 ### Definition
 
-Define the available phrases using YML.
+Define the available phrases in a file called `Localized.yml`.
+
+```yml
+default: en
+
+export:
+    en: Export Document
+    de: Exportiere das Dokument
+
+send(message, name):
+    en: Send (message) to (name).
+    de: Sende (message) to (name).
+```
+
+As you can see, you can add parameters using brackets after the key.
+
+The line `default: en` sets English as the fallback language.
+
+Then, add the `Localized` dependency, the plugin and the `Localized.yml` resource
+to the target in the `Package.swift` file.
+
+```swift
+.executableTarget(
+    name: "PluginTests",
+    dependencies: ["Localized"],
+    resources: [.process("Localized.yml")],
+    plugins: ["GenerateLocalized"]
+)
+```
+
+<details>
+
+<summary> Use the Swift macro alternatively </summary>
+
+If you don't want to have a separate `Localized.yml` resource, you can use the
+YML syntax directly in your Swift code using a Swift macro.
+Leave out the `resources` and `plugins` lines in the target definition, and 
+instead of creating a `Localized.yml` file, use the following macro in a Swift file.
 
 ```swift
 #localized(default: "en", yml: """
@@ -74,7 +111,9 @@ send(message, name):
 """)
 ```
 
-As you can see, you can add parameters using brackets after the key.
+You cannot have a `defaultLanguage` set in the YML, instead, use the macro parameter.
+
+</details>
 
 ### Usage
 

Sources/Generation/Generation.swift

@@ -0,0 +1,26 @@
+//
+//  Generation.swift
+//  Localized
+//
+//  Created by david-swift on 02.03.2024.
+//
+
+import Foundation
+import GenerationLibrary
+
+/// A type containing the generation function for the plugin.
+@main
+public enum Generation {
+
+    /// Generate the Swift code for the plugin.
+    public static func main() throws {
+        let yml = try String(contentsOfFile: CommandLine.arguments[1])
+        let content = try GenerationLibrary.Generation.getCode(yml: yml)
+        let outputPathIndex = 2
+        FileManager.default.createFile(
+            atPath: CommandLine.arguments[outputPathIndex],
+            contents: .init(("import Localized" + "\n\n" + content[0] + "\n\n" + content[1]).utf8)
+        )
+    }
+
+}

Sources/GenerationLibrary/Generation.swift

@@ -0,0 +1,247 @@
+//
+//  Generation.swift
+//  Localized
+//
+//  Created by david-swift on 02.03.2024.
+//
+
+import Yams
+
+/// Generate the Swift code for the plugin and macro.
+public enum Generation {
+
+    /// Number of spaces for indentation 1.
+    static let indentOne = 4
+    /// Number of spaces for indentation 2.
+    static let indentTwo = 8
+    /// Number of spaces for indentation 3.
+    static let indentThree = 12
+
+    /// An error that occurs during code generation.
+    public enum GenerationError: Error {
+
+        /// A translation in the default language missing for a specific key.
+        /// Missing translations in other languages will cause the default language to be used.
+        case missingTranslationInDefaultLanguage(key: String)
+        /// An unknown error occured while parsing the YML.
+        case unknownYMLPasingError
+        /// The default language information is missing.
+        case missingDefaultLanguage
+
+    }
+
+    /// Get the Swift code for the plugin and macro.
+    /// - Parameter yml: The YML code.
+    /// - Returns: The code.
+    public static func getCode(yml: String) throws -> [String] {
+        guard var dict = try Yams.load(yaml: yml) as? [String: Any] else {
+            throw GenerationError.unknownYMLPasingError
+        }
+        guard let defaultLanguage = dict["default"] as? String else {
+            throw GenerationError.missingDefaultLanguage
+        }
+        dict["default"] = nil
+        guard let dictionary = dict as? [String: [String: String]] else {
+            throw GenerationError.unknownYMLPasingError
+        }
+        return [
+            """
+            enum Localized {
+
+                static var yml: String {
+                    \"""
+            \(indent(yml, by: indentTwo))
+                    \"""
+                }
+
+            \(generateEnumCases(dictionary: dictionary))
+
+                var string: String { string(for: System.getLanguage()) }
+
+            \(try generateTranslations(dictionary: dictionary, defaultLanguage: defaultLanguage))
+
+            \(generateLanguageFunction(dictionary: dictionary, defaultLanguage: defaultLanguage))
+
+            }
+            """,
+            """
+            enum Loc {
+
+            \(generateStaticLocVariables(dictionary: dictionary))
+
+            }
+            """
+        ]
+    }
+
+    /// Generate the cases for the `Localized` enumeration.
+    /// - Parameter dictionary: The parsed YML.
+    /// - Returns: The syntax.
+    static func generateEnumCases(dictionary: [String: [String: String]]) -> String {
+        var result = ""
+        for entry in dictionary {
+            let key = parse(key: entry.key)
+            if key.1.isEmpty {
+                result.append("""
+                    case \(entry.key)
+
+                """)
+            } else {
+                var line = "case \(key.0)("
+                for argument in key.1 {
+                    line += "\(argument): String, "
+                }
+                line.removeLast(", ".count)
+                line += ")"
+                result.append("""
+                    \(line)
+
+                """)
+            }
+        }
+        return result
+    }
+
+    /// Generate the static variables and functions for the `Loc` type.
+    /// - Parameter dictionary: The parsed YML.
+    /// - Returns: The syntax.
+    static func generateStaticLocVariables(dictionary: [String: [String: String]]) -> String {
+        var result = ""
+        for entry in dictionary {
+            let key = parse(key: entry.key)
+            if key.1.isEmpty {
+                result.append("""
+                    static var \(entry.key): String { Localized.\(entry.key).string }
+
+                """)
+            } else {
+                var line = "static func \(key.0)("
+                for argument in key.1 {
+                    line += "\(argument): String, "
+                }
+                line.removeLast(", ".count)
+                line += ") -> String {\n" + indent("Localized.\(key.0)(", by: indentOne)
+                for argument in key.1 {
+                    line += "\(argument): \(argument), "
+                }
+                line.removeLast(", ".count)
+                line += ").string"
+                line += "\n}"
+                result.append("""
+                    \(line)
+
+                """)
+            }
+        }
+        return result
+    }
+
+    /// Generate the variables for the translations.
+    /// - Parameters:
+    ///     - dictionary: The parsed YML.
+    ///     - defaultLanguage: The default language.
+    /// - Returns: The syntax.
+    static func generateTranslations(dictionary: [String: [String: String]], defaultLanguage: String) throws -> String {
+        var result = ""
+        for language in getLanguages(dictionary: dictionary) {
+            var variable = indent("var \(language): String {", by: indentOne)
+            variable += indent("\nswitch self {", by: indentTwo)
+            for entry in dictionary {
+                let key = parse(key: entry.key)
+                guard let valueForLanguage = entry.value[language] ?? entry.value[defaultLanguage] else {
+                    throw GenerationError.missingTranslationInDefaultLanguage(key: key.0)
+                }
+                if key.1.isEmpty {
+                    variable += indent("\ncase .\(entry.key):", by: indentTwo)
+                    variable += indent("\n\"\(valueForLanguage)\"", by: indentThree)
+                } else {
+                    let translation = parse(translation: valueForLanguage, arguments: key.1)
+                    variable += indent("\ncase let .\(entry.key):", by: indentTwo)
+                    variable += indent("\n\"\(translation)\"", by: indentThree)
+                }
+            }
+            variable += indent("\n    }\n}", by: indentOne)
+            result += """
+            \(variable)
+
+            """
+        }
+        return result
+    }
+
+    /// Generate the function for getting the translated string for a specified language code.
+    /// - Parameters:
+    ///     - dictionary: The parsed YML.
+    ///     - defaultLanguage: The default language.
+    /// - Returns: The syntax.
+    static func generateLanguageFunction(
+        dictionary: [String: [String: String]],
+        defaultLanguage: String
+    ) -> String {
+        var result = "func string(for language: String) -> String {\n"
+        for language in getLanguages(dictionary: dictionary) where language != defaultLanguage {
+            result += indent("if language.hasPrefix(\"\(language)\") {", by: indentTwo)
+            result += indent("\nreturn \(language)", by: indentThree)
+            result += indent("\n} else", by: indentTwo)
+        }
+        result += """
+        {
+            return \(defaultLanguage)
+        }
+        }
+        """
+        return result
+    }
+
+    /// Get the available languages.
+    /// - Parameter dictionary: The parsed YML.
+    /// - Returns: The syntax
+    static func getLanguages(dictionary: [String: [String: String]]) -> [String] {
+        var languages: Set<String> = []
+        for key in dictionary {
+            languages = languages.union(key.value.map { $0.key })
+        }
+        return .init(languages)
+    }
+
+    /// Parse the key for a phrase.
+    /// - Parameter key: The key definition including parameters.
+    /// - Returns: The key.
+    static func parse(key: String) -> (String, [String]) {
+        let parts = key.split(separator: "(")
+        if parts.count == 1 {
+            return (key, [])
+        }
+        let arguments = parts[1].dropLast().split(separator: ", ").map { String($0) }
+        return (.init(parts[0]), arguments)
+    }
+
+    /// Parse the translation for a phrase.
+    /// - Parameters:
+    ///     - translation: The translation without correct escaping.
+    ///     - arguments: The arguments.
+    /// - Returns: The syntax.
+    static func parse(translation: String, arguments: [String]) -> String {
+        var translation = translation
+        for argument in arguments {
+            translation.replace("(\(argument))", with: "\\(\(argument))")
+        }
+        return translation
+    }
+
+    /// Indent each line of a text by a certain amount of whitespaces.
+    /// - Parameters:
+    ///     - string: The text.
+    ///     - count: The indentation.
+    /// - Returns: The syntax.
+    static func indent(_ string: String, by count: Int) -> String {
+        .init(
+            string
+                .components(separatedBy: "\n")
+                .map { "\n" + Array(repeating: " ", count: count).joined() + $0 }
+                .joined()
+                .trimmingPrefix("\n")
+        )
+    }
+
+}

Sources/Localized/Localized.swift

@@ -5,12 +5,7 @@
 //  Created by david-swift on 27.02.2024.
 //
 
-/// A macro that produces both a value and a string containing the
-/// source code that generated the value. For example,
-///
-///     #stringify(x + y)
-///
-/// produces a tuple `(x + y, "x + y")`.
+/// A macro that takes the YML syntax and converts it into enumerations.
 @freestanding(declaration, names: named(Localized), named(Loc))
 public macro localized(default defaultLanguage: String, yml: String) = #externalMacro(
     module: "LocalizedMacros",

Sources/LocalizedMacros/LocalizedMacro.swift

@@ -5,12 +5,10 @@
 //  Created by david-swift on 27.02.2024.
 //
 
-// swiftlint:disable force_unwrapping force_cast
-
+import GenerationLibrary
 import MacroToolkit
 import SwiftSyntax
 import SwiftSyntaxMacros
-import Yams
 
 /// Implementation of the `localized` macro, which takes YML 
 /// as a string and converts it into two enumerations.
@@ -19,13 +17,6 @@ import Yams
 /// Use `Loc.key` for a quick access to the automatically localized value.
 public struct LocalizedMacro: DeclarationMacro {
 
-    /// Number of spaces for indentation 1.
-    static let indentOne = 4
-    /// Number of spaces for indentation 2.
-    static let indentTwo = 8
-    /// Number of spaces for indentation 3.
-    static let indentThree = 12
-
     /// The errors the expansion can throw.
     public enum LocalizedError: Error {
 
@@ -45,199 +36,16 @@ public struct LocalizedMacro: DeclarationMacro {
         of node: some SwiftSyntax.FreestandingMacroExpansionSyntax,
         in context: some SwiftSyntaxMacros.MacroExpansionContext
     ) throws -> [SwiftSyntax.DeclSyntax] {
-        guard let `default` = node.argumentList.first?.expression.as(StringLiteralExprSyntax.self) else {
+        guard let `default` = node.argumentList.first?.expression.as(StringLiteralExprSyntax.self),
+        let defaultLanguage = StringLiteral(`default`).value?.description else {
             throw LocalizedError.invalidDefaultLanguage
         }
-        guard let syntax = node.argumentList.last?.expression.as(StringLiteralExprSyntax.self) else {
+        guard let syntax = node.argumentList.last?.expression.as(StringLiteralExprSyntax.self),
+        var yml = StringLiteral(syntax).value else {
             throw LocalizedError.invalidStringLiteral
         }
-        let dictionary = try Yams.load(yaml: StringLiteral(syntax).value!) as! [String: [String: String]]
-        return [
-            """
-            enum Localized {
-
-                static var yml: String {
-                    \"""
-            \(raw: indent(StringLiteral(syntax).value!.description, by: indentTwo))
-                    \"""
+        yml.append("\n\ndefault: \"\(defaultLanguage)\"")
+        return try Generation.getCode(yml: yml).map { "\(raw: $0)" }
     }
 
-            \(raw: generateEnumCases(dictionary: dictionary))
-
-                var string: String { string(for: System.getLanguage()) }
-
-            \(raw: generateTranslations(dictionary: dictionary))
-
-            \(raw: generateLanguageFunction(dictionary: dictionary, defaultLanguage: `default`))
-
-            }
-            """,
-            """
-            enum Loc {
-
-            \(raw: generateStaticLocVariables(dictionary: dictionary))
-
-            }
-            """
-        ]
-    }
-
-    /// Generate the cases for the `Localized` enumeration.
-    /// - Parameter dictionary: The parsed YML.
-    /// - Returns: The syntax.
-    static func generateEnumCases(dictionary: [String: [String: String]]) -> String {
-        var result = ""
-        for entry in dictionary {
-            let key = parse(key: entry.key)
-            if key.1.isEmpty {
-                result.append("""
-                    case \(entry.key)
-                """)
-            } else {
-                var line = "case \(key.0)("
-                for argument in key.1 {
-                    line += "\(argument): String, "
-                }
-                line.removeLast(", ".count)
-                line += ")"
-                result.append("""
-                    \(line)
-                """)
-            }
-        }
-        return result
-    }
-
-    /// Generate the static variables and functions for the `Loc` type.
-    /// - Parameter dictionary: The parsed YML.
-    /// - Returns: The syntax.
-    static func generateStaticLocVariables(dictionary: [String: [String: String]]) -> String {
-        var result = ""
-        for entry in dictionary {
-            let key = parse(key: entry.key)
-            if key.1.isEmpty {
-                result.append("""
-                    static var \(entry.key): String { Localized.\(entry.key).string }
-                """)
-            } else {
-                var line = "static func \(key.0)("
-                for argument in key.1 {
-                    line += "\(argument): String, "
-                }
-                line.removeLast(", ".count)
-                line += ") -> String {\n" + indent("Localized.\(key.0)(", by: indentOne)
-                for argument in key.1 {
-                    line += "\(argument): \(argument), "
-                }
-                line.removeLast(", ".count)
-                line += ").string"
-                line += "\n}"
-                result.append("""
-                    \(line)
-                """)
-            }
-        }
-        return result
-    }
-
-    /// Generate the variables for the translations.
-    /// - Parameter dictionary: The parsed YML.
-    /// - Returns: The syntax.
-    static func generateTranslations(dictionary: [String: [String: String]]) -> String {
-        var result = ""
-        for language in getLanguages(dictionary: dictionary) {
-            var variable = indent("var \(language): String {", by: indentOne)
-            variable += indent("\nswitch self {", by: indentTwo)
-            for entry in dictionary {
-                let key = parse(key: entry.key)
-                if key.1.isEmpty {
-                    variable += indent("\ncase .\(entry.key):", by: indentTwo)
-                    variable += indent("\n\"\(entry.value[language]!)\"", by: indentThree)
-                } else {
-                    let translation = parse(translation: entry.value[language]!, arguments: key.1)
-                    variable += indent("\ncase let .\(entry.key):", by: indentTwo)
-                    variable += indent("\n\"\(translation)\"", by: indentThree)
-                }
-            }
-            variable += indent("\n    }\n}", by: indentOne)
-            result += """
-            \(variable)
-            """
-        }
-        return result
-    }
-
-    /// Generate the function for getting the translated string for a specified language code.
-    /// - Parameters:
-    ///     - dictionary: The parsed YML.
-    ///     - defaultLanguage: The syntax for the default language.
-    /// - Returns: The syntax.
-    static func generateLanguageFunction(
-        dictionary: [String: [String: String]],
-        defaultLanguage: StringLiteralExprSyntax
-    ) -> String {
-        let defaultLanguage = StringLiteral(defaultLanguage).value!.description
-        var result = "func string(for language: String) -> String {\n"
-        for language in getLanguages(dictionary: dictionary) where language != defaultLanguage {
-            result += indent("if language.hasPrefix(\"\(language)\") {", by: indentTwo)
-            result += indent("\nreturn \(language)", by: indentThree)
-            result += indent("\n} else", by: indentTwo)
-        }
-        result += """
-        {
-            return \(defaultLanguage)
-        }
-        }
-        """
-        return result
-    }
-
-    /// Get the available languages.
-    /// - Parameter dictionary: The parsed YML.
-    /// - Returns: The syntax
-    static func getLanguages(dictionary: [String: [String: String]]) -> [String] {
-        dictionary.first?.value.map { $0.key } ?? []
-    }
-
-    /// Parse the key for a phrase.
-    /// - Parameter key: The key definition including parameters.
-    /// - Returns: The key.
-    static func parse(key: String) -> (String, [String]) {
-        let parts = key.split(separator: "(")
-        if parts.count == 1 {
-            return (key, [])
-        }
-        let arguments = parts[1].dropLast().split(separator: ", ").map { String($0) }
-        return (.init(parts[0]), arguments)
-    }
-
-    /// Parse the translation for a phrase.
-    /// - Parameters:
-    ///     - translation: The translation without correct escaping.
-    ///     - arguments: The arguments.
-    /// - Returns: The syntax.
-    static func parse(translation: String, arguments: [String]) -> String {
-        var translation = translation
-        for argument in arguments {
-            translation.replace("(\(argument))", with: "\\(\(argument))")
-        }
-        return translation
-    }
-
-    /// Indent each line of a text by a certain amount of whitespaces.
-    /// - Parameters:
-    ///     - string: The text.
-    ///     - count: The indentation.
-    /// - Returns: The syntax.
-    static func indent(_ string: String, by count: Int) -> String {
-        .init(
-            string
-                .components(separatedBy: "\n")
-                .map { "\n" + Array(repeating: " ", count: count).joined() + $0 }
-                .joined()
-                .trimmingPrefix("\n")
-        )
-    }
 }
-
-// swiftlint:enable force_unwrapping force_cast

Tests/MacroTests/Tests.swift

@@ -0,0 +1,43 @@
+//
+//  Tests.swift
+//  Localized
+//
+//  Created by david-swift on 27.02.2024.
+//
+
+import Foundation
+import Localized
+
+#localized(default: "en", yml: """
+hello(name):
+    en: Hello, (name)!
+    de: Hallo, (name)!
+    fr: Salut, (name)!
+
+house:
+    en: House
+    de: Haus
+    fr: Maison
+
+helloPair(name1, name2):
+    en: Hello, (name1) and (name2)!
+    de: Hallo, (name1) und (name2)!
+    fr: Salut, (name1) et (name2)!
+""")
+
+/// Test cases for the `localized` macro.
+@main
+enum Tests {
+
+    /// Test the `localized` macro.
+    static func main() {
+        print("EN: \(Localized.hello(name: "Peter").en)")
+        print("DE: \(Localized.hello(name: "Ruedi").de)")
+        print("SYSTEM: \(Loc.hello(name: "Sams"))")
+        print("FR: \(Localized.house.fr)")
+        print("DE_CH: \(Localized.house.string(for: "de_CH"))")
+        print("SYSTEM: \(Localized.house.string)")
+        print("EN: \(Localized.helloPair(name1: "Max", name2: "Ruedi").en)")
+    }
+
+}

Tests/PluginTests/Localized.yml

@@ -0,0 +1,16 @@
+default: en
+
+hello(name):
+    en: Hello, (name)!
+    de: Hallo, (name)!
+    fr: Salut, (name)!
+
+house:
+    en: House
+    de: Haus
+    fr: Maison
+
+helloPair(name1, name2):
+    en: Hello, (name1) and (name2)!
+    de: Hallo, (name1) und (name2)!
+    fr: Salut, (name1) et (name2)!

Tests/PluginTests/Tests.swift

@@ -0,0 +1,25 @@
+//
+//  Tests.swift
+//  Localized
+//
+//  Created by david-swift on 27.02.2024.
+//
+
+import Foundation
+
+/// Test cases for the `GenerateLocalized` plugin.
+@main
+enum Tests {
+
+    /// Test the `GenerateLocalized` plugin.
+    static func main() {
+        print("EN: \(Localized.hello(name: "Peter").en)")
+        print("DE: \(Localized.hello(name: "Ruedi").de)")
+        print("SYSTEM: \(Loc.hello(name: "Sams"))")
+        print("FR: \(Localized.house.fr)")
+        print("DE_CH: \(Localized.house.string(for: "de_CH"))")
+        print("SYSTEM: \(Localized.house.string)")
+        print("EN: \(Localized.helloPair(name1: "Max", name2: "Ruedi").en)")
+    }
+
+}