147 lines
4.3 KiB
JavaScript
147 lines
4.3 KiB
JavaScript
#// 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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}
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