aoqi@0: #// Usage: jjs -scripting javashell.js
aoqi@0: 
aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
aoqi@0:  * Redistribution and use in source and binary forms, with or without
aoqi@0:  * modification, are permitted provided that the following conditions
aoqi@0:  * are met:
attila@962:  *
aoqi@0:  *   - Redistributions of source code must retain the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
aoqi@0:  *   - Redistributions in binary form must reproduce the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer in the
aoqi@0:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
aoqi@0:  *   - Neither the name of Oracle nor the names of its
aoqi@0:  *     contributors may be used to endorse or promote products derived
aoqi@0:  *     from this software without specific prior written permission.
attila@962:  *
aoqi@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0:  */
aoqi@0: 
aoqi@0: // Simple Java "shell" with which you can try out
aoqi@0: // your few liner Java code leaving imports, main etc.
aoqi@0: // And you can leave even compilation as this script
aoqi@0: // takes care boilerplate+compile step for you.
aoqi@0: 
aoqi@0: // Java types used
aoqi@0: var Arrays = Java.type("java.util.Arrays");
aoqi@0: var BufferedReader = Java.type("java.io.BufferedReader");
aoqi@0: var FileWriter = Java.type("java.io.FileWriter");
aoqi@0: var LocalDateTime = Java.type("java.time.LocalDateTime");
aoqi@0: var InputStreamReader = Java.type("java.io.InputStreamReader");
aoqi@0: var PrintWriter = Java.type("java.io.PrintWriter");
aoqi@0: var ProcessBuilder = Java.type("java.lang.ProcessBuilder");
aoqi@0: var System = Java.type("java.lang.System");
aoqi@0: 
aoqi@0: // read multiple lines of input from stdin till user
aoqi@0: // enters an empty line
aoqi@0: function input(endMarker, prompt) {
aoqi@0:     if (!endMarker) {
aoqi@0:         endMarker = "";
aoqi@0:     }
aoqi@0: 
aoqi@0:     if (!prompt) {
aoqi@0:         prompt = " >> ";
aoqi@0:     }
aoqi@0: 
aoqi@0:     var str = "";
aoqi@0:     var reader = new BufferedReader(new InputStreamReader(System.in));
aoqi@0:     var line;
aoqi@0:     while (true) {
aoqi@0:         System.out.print(prompt);
aoqi@0:         line = reader.readLine();
aoqi@0:         if (line == null || line == endMarker) {
aoqi@0:             break;
aoqi@0:         }
aoqi@0:         str += line + "\n";
aoqi@0:     }
aoqi@0:     return str;
aoqi@0: }
aoqi@0: 
aoqi@0: // write the string to the given file
aoqi@0: function writeTo(file, str) {
aoqi@0:     var w = new PrintWriter(new FileWriter(file));
aoqi@0:     try {
aoqi@0:         w.print(str);
aoqi@0:     } finally {
aoqi@0:         w.close();
aoqi@0:     }
aoqi@0: }
aoqi@0: 
aoqi@0: // generate Java code with user's input
aoqi@0: // put inside generated main method
aoqi@0: function generate(className) {
aoqi@0:     var usercode = input();
aoqi@0:     if (usercode == "") {
aoqi@0:         return false;
aoqi@0:     }
aoqi@0: 
aoqi@0:     var fullcode = <<EOF
aoqi@0: // userful imports, add more here if you want
aoqi@0: // more imports.
aoqi@0: import static java.lang.System.*;
aoqi@0: import java.io.*;
aoqi@0: import java.net.*;
aoqi@0: import java.math.*;
aoqi@0: import java.nio.file.*;
aoqi@0: import java.time.*;
aoqi@0: import java.time.chrono.*;
aoqi@0: import java.time.format.*;
aoqi@0: import java.time.temporal.*;
aoqi@0: import java.time.zone.*;
aoqi@0: import java.util.*;
aoqi@0: import java.util.concurrent.*;
aoqi@0: import java.util.function.*;
aoqi@0: import java.util.stream.*;
aoqi@0: 
aoqi@0: public class ${className} {
aoqi@0:    public static void main(String[] args) throws Exception {
aoqi@0:        ${usercode}
aoqi@0:    }
aoqi@0: }
aoqi@0: EOF
aoqi@0: 
aoqi@0:     writeTo("${className}.java", fullcode);
aoqi@0:     return true;
aoqi@0: }
aoqi@0: 
aoqi@0: // execute code command
aoqi@0: function exec(args) {
aoqi@0:     // build child process and start it!
attila@1239:     new ProcessBuilder(Arrays.asList(args.split(' ')))
aoqi@0:          .inheritIO()
aoqi@0:          .start()
aoqi@0:          .waitFor();
aoqi@0: }
aoqi@0: 
aoqi@0: // generate unique name
aoqi@0: function uniqueName() {
aoqi@0:     var now = LocalDateTime.now().toString();
attila@962:     // replace unsafe chars with '_'
aoqi@0:     return "JavaShell" + now.replace(/-|:|\./g, '_');
aoqi@0: }
aoqi@0: 
aoqi@0: // read-compile-run loop
aoqi@0: while(true) {
aoqi@0:     var className = uniqueName();
aoqi@0:     if (generate(className)) {
aoqi@0:         exec("javac ${className}.java");
aoqi@0:         exec("java ${className}");
aoqi@0:     } else {
aoqi@0:         break;
aoqi@0:     }
aoqi@0: }