public static void writeFile(String dir, String fileName, String content) {
try {
File f = new File(dir, fileName);
FileWriter w = new FileWriter(f);
BufferedWriter bw = new BufferedWriter(w);
bw.write(content);
bw.close();
w.close();
} catch (IOException ioe) {
System.err.println("can't write file");
ioe.printStackTrace(System.err);
}
}
public Class<?> findClass(String s) {
try {
byte[] bytes = loadClassData(s);
return defineClass(s, bytes, 0, bytes.length);
} catch (IOException ioe) {
try {
return super.loadClass(s);
} catch (ClassNotFoundException ignore) {
}
ioe.printStackTrace(System.out);
return null;
}
}
// Writes the program to a source file, compiles it, and runs it.
private void compileAndRun(String fileName, String code) {
// Exceptions here can pick and choose what font to use, as needed.
// Exceptions thrown by the program, that cause the Playground to be unstable, should be in
// blue.
println("Deleting old temp files...", progErr);
new File(fileName + ".java").delete();
new File(fileName + ".class").delete();
println("Creating source file...", progErr);
file = new File(fileName + ".java");
println("Writing code to source file...", progErr);
try {
new FileWriter(file).append(code).close();
} catch (IOException i) {
println("Had an IO Exception when trying to write the code. Stack trace:", error);
i.printStackTrace();
return; // Exit on error
}
println("Compiling code...", progErr);
// This should only ever be called if the JDK isn't installed. How you'd get here, I don't
// know.
if (compiler == null) {
println("Fatal Error: JDK not installed. Go to java.sun.com and install.", error);
return;
}
// Tries to compile. Success code is 0, so if something goes wrong, do stuff.
int result =
compiler.run(
null,
null,
null,
file
.getAbsolutePath()); // Possibly add a new outputstream to parse through the
// compiler errors
if (result != 0) {
displayLog();
println("Failed to compile.", error);
return; // Return on error
}
println("Code compiled with 0 errors.", progErr);
println("Attempting to run code...", progErr);
run(fileName);
}
private static int findFreePort() {
try {
final ServerSocket serverSocket = new ServerSocket(0);
try {
return serverSocket.getLocalPort();
} finally {
// workaround for linux : calling close() immediately after opening socket
// may result that socket is not closed
synchronized (serverSocket) {
try {
serverSocket.wait(1);
} catch (Throwable ignored) {
}
}
serverSocket.close();
}
} catch (IOException e) {
e.printStackTrace(System.err);
return JavacServer.DEFAULT_SERVER_PORT;
}
}
// Creates a new thread, runs the program in that thread, and reports any errors as needed.
private void run(String clazz) {
try {
// Makes sure the JVM resets if it's already running.
if (JVMrunning) kill();
// Some String constants for java path and OS-specific separators.
String separator = System.getProperty("file.separator");
String path = System.getProperty("java.home") + separator + "bin" + separator + "java";
// Tries to run compiled code.
ProcessBuilder builder = new ProcessBuilder(path, clazz);
// Should be good now! Everything past this is on you. Don't mess it up.
println(
"Build succeeded on " + java.util.Calendar.getInstance().getTime().toString(), progErr);
println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~", progErr);
JVM = builder.start();
// Note that as of right now, there is no support for input. Only output.
Reader errorReader = new InputStreamReader(JVM.getErrorStream());
Reader outReader = new InputStreamReader(JVM.getInputStream());
// Writer inReader = new OutputStreamWriter(JVM.getOutputStream());
redirectErr = redirectIOStream(errorReader, err);
redirectOut = redirectIOStream(outReader, out);
// redirectIn = redirectIOStream(null, inReader);
} catch (IOException e) {
// JVM = builder.start() can throw this.
println("IOException when running the JVM.", progErr);
e.printStackTrace();
displayLog();
return;
}
}
/**
* Wow! much faster than compiling outside of VM. Finicky though. Had rules called r and modulo.
* Wouldn't compile til I changed to 'a'.
*/
protected boolean compile(String fileName) {
String classpathOption = "-classpath";
String[] args =
new String[] {
"javac",
"-d",
tmpdir,
classpathOption,
tmpdir + pathSep + CLASSPATH,
tmpdir + "/" + fileName
};
String cmdLine =
"javac"
+ " -d "
+ tmpdir
+ " "
+ classpathOption
+ " "
+ tmpdir
+ pathSep
+ CLASSPATH
+ " "
+ fileName;
// System.out.println("compile: "+cmdLine);
File f = new File(tmpdir, fileName);
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
// DiagnosticCollector<JavaFileObject> diagnostics =
// new DiagnosticCollector<JavaFileObject>();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
Iterable<? extends JavaFileObject> compilationUnits =
fileManager.getJavaFileObjectsFromFiles(Arrays.asList(f));
Iterable<String> compileOptions =
Arrays.asList(new String[] {"-d", tmpdir, "-cp", tmpdir + pathSep + CLASSPATH});
JavaCompiler.CompilationTask task =
compiler.getTask(null, fileManager, null, compileOptions, null, compilationUnits);
boolean ok = task.call();
try {
fileManager.close();
} catch (IOException ioe) {
ioe.printStackTrace(System.err);
}
// List<String> errors = new ArrayList<String>();
// for (Diagnostic diagnostic : diagnostics.getDiagnostics()) {
// errors.add(
// String.valueOf(diagnostic.getLineNumber())+
// ": " + diagnostic.getMessage(null));
// }
// if ( errors.size()>0 ) {
// System.err.println("compile stderr from: "+cmdLine);
// System.err.println(errors);
// return false;
// }
return ok;
/*
File outputDir = new File(tmpdir);
try {
Process process =
Runtime.getRuntime().exec(args, null, outputDir);
StreamVacuum stdout = new StreamVacuum(process.getInputStream());
StreamVacuum stderr = new StreamVacuum(process.getErrorStream());
stdout.start();
stderr.start();
process.waitFor();
stdout.join();
stderr.join();
if ( stdout.toString().length()>0 ) {
System.err.println("compile stdout from: "+cmdLine);
System.err.println(stdout);
}
if ( stderr.toString().length()>0 ) {
System.err.println("compile stderr from: "+cmdLine);
System.err.println(stderr);
}
int ret = process.exitValue();
return ret==0;
}
catch (Exception e) {
System.err.println("can't exec compilation");
e.printStackTrace(System.err);
return false;
}
*/
}