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ktosoktoso
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WIP on JExtractSwiftPlugin
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‎Package.swift

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@@ -127,6 +127,14 @@ let package = Package(
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targets: ["JExtractSwift"]
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),
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// ==== Plugin for wrapping Java classes in Swift
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.plugin(
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name: "JExtractSwiftPlugin",
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targets: [
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"JExtractSwiftPlugin"
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]
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),
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// ==== Examples
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.library(
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.unsafeFlags(["-I\(javaIncludePath)", "-I\(javaPlatformIncludePath)"])
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]
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),
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.plugin(
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name: "JavaCompilerPlugin",
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capability: .buildTool()
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]
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),
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.plugin(
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name: "JExtractSwiftPlugin",
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capability: .buildTool(),
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dependencies: [
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"JExtractSwiftTool"
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]
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),
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.testTarget(
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name: "JavaKitTests",
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dependencies: ["JavaKit", "JavaKitNetwork"],

‎Plugins/JExtractSwiftPlugin/Configuration.swift

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//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of Swift.org project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import Foundation
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/// Configuration for the JExtractSwift translation tool, provided on a per-target
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/// basis.
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struct Configuration: Codable {
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var javaPackage: String
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}
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func readConfiguration(sourceDir: String) throws -> Configuration {
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let configFile = URL(filePath: sourceDir).appending(path: "JExtractSwift.config")
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do {
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let configData = try Data(contentsOf: configFile)
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return try JSONDecoder().decode(Configuration.self, from: configData)
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} catch {
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throw ConfigurationError(message: "Failed to parse JExtractSwift configuration at '\(configFile)!'", error: error)
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}
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}
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struct ConfigurationError: Error {
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let message: String
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let error: any Error
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}

‎Plugins/JExtractSwiftPlugin/JExtractSwiftPlugin.swift

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//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of Swift.org project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import Foundation
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import PackagePlugin
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@main
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struct JExtractSwiftBuildToolPlugin: BuildToolPlugin {
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func createBuildCommands(context: PluginContext, target: Target) throws -> [Command] {
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guard let sourceModule = target.sourceModule else { return [] }
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// Note: Target doesn't have a directoryURL counterpart to directory,
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// so we cannot eliminate this deprecation warning.
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let sourceDir = target.directory.string
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let configuration = try readConfiguration(sourceDir: "\(sourceDir)")
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// We use the the usual maven-style structure of "src/[generated|main|test]/java/..."
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// that is common in JVM ecosystem
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let outputDirectory = context.pluginWorkDirectoryURL
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.appending(path: "src")
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.appending(path: "generated")
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.appending(path: "java")
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var arguments: [String] = [
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"--swift-module", sourceModule.name,
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"--package-name", configuration.javaPackage,
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"--output-directory", outputDirectory.path(percentEncoded: false),
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// TODO: "--build-cache-directory", ...
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// Since plugins cannot depend on libraries we cannot detect what the output files will be,
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// as it depends on the contents of the input files. Therefore we have to implement this as a prebuild plugin.
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// We'll have to make up some caching inside the tool so we don't re-parse files which have not changed etc.
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]
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arguments.append(sourceDir)
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return [
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.prebuildCommand(
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displayName: "Generate Java wrappers for Swift types",
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executable: try context.tool(named: "JExtractSwiftTool").url,
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arguments: arguments,
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// inputFiles: [ configFile ] + swiftFiles,
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// outputFiles: outputJavaFiles
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outputFilesDirectory: outputDirectory
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)
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]
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}
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}
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// Note: the JAVA_HOME environment variable must be set to point to where
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// Java is installed, e.g.,
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// Library/Java/JavaVirtualMachines/openjdk-21.jdk/Contents/Home.
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func findJavaHome() -> String {
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if let home = ProcessInfo.processInfo.environment["JAVA_HOME"] {
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return home
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}
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// This is a workaround for envs (some IDEs) which have trouble with
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// picking up env variables during the build process
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let path = "\(FileManager.default.homeDirectoryForCurrentUser.path()).java_home"
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if let home = try? String(contentsOfFile: path, encoding: .utf8) {
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if let lastChar = home.last, lastChar.isNewline {
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return String(home.dropLast())
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}
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return home
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}
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fatalError("Please set the JAVA_HOME environment variable to point to where Java is installed.")
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}

‎Samples/JExtractPluginSampleApp/.gitignore

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.DS_Store
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/.build
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/Packages
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xcuserdata/
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DerivedData/
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.swiftpm/configuration/registries.json
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.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
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.netrc

‎Samples/JExtractPluginSampleApp/Package.swift

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// swift-tools-version: 6.0
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// The swift-tools-version declares the minimum version of Swift required to build this package.
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import PackageDescription
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import class Foundation.FileManager
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import class Foundation.ProcessInfo
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// Note: the JAVA_HOME environment variable must be set to point to where
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// Java is installed, e.g.,
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// Library/Java/JavaVirtualMachines/openjdk-21.jdk/Contents/Home.
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func findJavaHome() -> String {
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if let home = ProcessInfo.processInfo.environment["JAVA_HOME"] {
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return home
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}
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// This is a workaround for envs (some IDEs) which have trouble with
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// picking up env variables during the build process
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let path = "\(FileManager.default.homeDirectoryForCurrentUser.path()).java_home"
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if let home = try? String(contentsOfFile: path, encoding: .utf8) {
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if let lastChar = home.last, lastChar.isNewline {
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return String(home.dropLast())
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}
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return home
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}
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fatalError("Please set the JAVA_HOME environment variable to point to where Java is installed.")
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}
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let javaHome = findJavaHome()
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let javaIncludePath = "\(javaHome)/include"
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#if os(Linux)
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let javaPlatformIncludePath = "\(javaIncludePath)/linux"
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#elseif os(macOS)
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let javaPlatformIncludePath = "\(javaIncludePath)/darwin"
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#else
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// TODO: Handle windows as well
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#error("Currently only macOS and Linux platforms are supported, this may change in the future.")
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#endif
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let package = Package(
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name: "JExtractPluginSampleApp",
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platforms: [
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.macOS(.v10_15),
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],
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dependencies: [
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.package(name: "swift-java", path: "../../"),
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],
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targets: [
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.executableTarget(
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name: "JExtractPluginSample",
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dependencies: [
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],
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swiftSettings: [
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.unsafeFlags(["-I\(javaIncludePath)", "-I\(javaPlatformIncludePath)"])
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],
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plugins: [
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.plugin(name: "JExtractSwiftPlugin", package: "swift-java"),
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]
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),
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]
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)

‎Samples/JExtractPluginSampleApp/Sources/JExtractPluginSample/JExtractSwift.config

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{
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"javaPackage": "com.example.swift"
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}

‎Samples/JExtractPluginSampleApp/Sources/JExtractPluginSample/main.swift

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//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of Swift.org project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import JavaKit
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let jvm = try JavaVirtualMachine.shared(classPath: ["QuadraticSieve-1.0.jar"])
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do {
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let sieveClass = try JavaClass<SieveOfEratosthenes>(environment: jvm.environment())
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for prime in sieveClass.findPrimes(100)! {
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print("Found prime: \(prime.intValue())")
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}
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} catch {
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print("Failure: \(error)")
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}

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