author | duke |
Wed, 05 Jul 2017 21:31:37 +0200 | |
changeset 36782 | 6072af7a98be |
parent 28881 | 0008daeef352 |
permissions | -rw-r--r-- |
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#// Usage: jjs -scripting javashell.js |
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/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* - Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* - Neither the name of Oracle nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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// Simple Java "shell" with which you can try out |
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// your few liner Java code leaving imports, main etc. |
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// And you can leave even compilation as this script |
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// takes care boilerplate+compile step for you. |
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// Java types used |
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var Arrays = Java.type("java.util.Arrays"); |
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var BufferedReader = Java.type("java.io.BufferedReader"); |
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var FileWriter = Java.type("java.io.FileWriter"); |
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var LocalDateTime = Java.type("java.time.LocalDateTime"); |
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var InputStreamReader = Java.type("java.io.InputStreamReader"); |
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var PrintWriter = Java.type("java.io.PrintWriter"); |
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var ProcessBuilder = Java.type("java.lang.ProcessBuilder"); |
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var System = Java.type("java.lang.System"); |
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// read multiple lines of input from stdin till user |
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// enters an empty line |
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function input(endMarker, prompt) { |
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if (!endMarker) { |
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endMarker = ""; |
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} |
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if (!prompt) { |
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prompt = " >> "; |
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} |
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var str = ""; |
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var reader = new BufferedReader(new InputStreamReader(System.in)); |
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var line; |
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while (true) { |
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System.out.print(prompt); |
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line = reader.readLine(); |
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if (line == null || line == endMarker) { |
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break; |
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} |
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str += line + "\n"; |
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} |
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return str; |
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} |
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// write the string to the given file |
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function writeTo(file, str) { |
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var w = new PrintWriter(new FileWriter(file)); |
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try { |
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w.print(str); |
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} finally { |
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w.close(); |
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} |
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} |
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// generate Java code with user's input |
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// put inside generated main method |
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function generate(className) { |
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var usercode = input(); |
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if (usercode == "") { |
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return false; |
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} |
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var fullcode = <<EOF |
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// userful imports, add more here if you want |
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// more imports. |
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import static java.lang.System.*; |
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import java.io.*; |
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import java.net.*; |
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import java.math.*; |
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import java.nio.file.*; |
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import java.time.*; |
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import java.time.chrono.*; |
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import java.time.format.*; |
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import java.time.temporal.*; |
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import java.time.zone.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.function.*; |
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import java.util.stream.*; |
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public class ${className} { |
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public static void main(String[] args) throws Exception { |
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${usercode} |
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} |
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} |
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EOF |
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writeTo("${className}.java", fullcode); |
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return true; |
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} |
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// execute code command |
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function exec(args) { |
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// build child process and start it! |
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new ProcessBuilder(Arrays.asList(args.split(' '))) |
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.inheritIO() |
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.start() |
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.waitFor(); |
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} |
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// generate unique name |
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function uniqueName() { |
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var now = LocalDateTime.now().toString(); |
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// replace unsafe chars with '_' |
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return "JavaShell" + now.replace(/-|:|\./g, '_'); |
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} |
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// read-compile-run loop |
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while(true) { |
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var className = uniqueName(); |
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if (generate(className)) { |
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exec("javac ${className}.java"); |
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exec("java ${className}"); |
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} else { |
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break; |
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} |
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} |