Mercurial > jdk8-mips64-public > nashorn / file revision

 #// Usage: jjs -scripting javashell.js

 /*

  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

  * 

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  * 

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in the

  *     documentation and/or other materials provided with the distribution.

  * 

  *   - Neither the name of Oracle nor the names of its

  *     contributors may be used to endorse or promote products derived

  *     from this software without specific prior written permission.

  * 

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 // Simple Java "shell" with which you can try out

 // your few liner Java code leaving imports, main etc.

 // And you can leave even compilation as this script

 // takes care boilerplate+compile step for you.

 // Java types used

 var Arrays = Java.type("java.util.Arrays");

 var BufferedReader = Java.type("java.io.BufferedReader");

 var FileWriter = Java.type("java.io.FileWriter");

 var LocalDateTime = Java.type("java.time.LocalDateTime");

 var InputStreamReader = Java.type("java.io.InputStreamReader");

 var PrintWriter = Java.type("java.io.PrintWriter");

 var ProcessBuilder = Java.type("java.lang.ProcessBuilder");

 var System = Java.type("java.lang.System");

 // read multiple lines of input from stdin till user

 // enters an empty line

 function input(endMarker, prompt) {

     if (!endMarker) {

         endMarker = "";

     }

     if (!prompt) {

         prompt = " >> ";

     }

     var str = "";

     var reader = new BufferedReader(new InputStreamReader(System.in));

     var line;

     while (true) {

         System.out.print(prompt);

         line = reader.readLine();

         if (line == null || line == endMarker) {

             break;

         }

         str += line + "\n";

     }

     return str;

 }

 // write the string to the given file

 function writeTo(file, str) {

     var w = new PrintWriter(new FileWriter(file));

     try {

         w.print(str);

     } finally {

         w.close();

     }

 }

 // generate Java code with user's input

 // put inside generated main method

 function generate(className) {

     var usercode = input();

     if (usercode == "") {

         return false;

     }

     var fullcode = <<EOF

 // userful imports, add more here if you want

 // more imports.

 import static java.lang.System.*;

 import java.io.*;

 import java.net.*;

 import java.math.*;

 import java.nio.file.*;

 import java.time.*;

 import java.time.chrono.*;

 import java.time.format.*;

 import java.time.temporal.*;

 import java.time.zone.*;

 import java.util.*;

 import java.util.concurrent.*;

 import java.util.function.*;

 import java.util.stream.*;

 public class ${className} {

    public static void main(String[] args) throws Exception {

        ${usercode}

    }

 }

 EOF

     writeTo("${className}.java", fullcode);

     return true;

 }

 // execute code command

 function exec(args) {

     // build child process and start it!

     new ProcessBuilder(Arrays.asList(args.split(' ')))

          .inheritIO()

          .start()

          .waitFor();

 }

 // generate unique name

 function uniqueName() {

     var now = LocalDateTime.now().toString();

     // replace unsafe chars with '_' 

     return "JavaShell" + now.replace(/-|:|\./g, '_');

 }

 // read-compile-run loop

 while(true) {

     var className = uniqueName();

     if (generate(className)) {

         exec("javac ${className}.java");

         exec("java ${className}");

     } else {

         break;

     }

 }