1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/javashell.js Wed Apr 27 01:36:41 2016 +0800
1.3 @@ -0,0 +1,146 @@
1.4 +#// Usage: jjs -scripting javashell.js
1.5 +
1.6 +/*
1.7 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.8 + *
1.9 + * Redistribution and use in source and binary forms, with or without
1.10 + * modification, are permitted provided that the following conditions
1.11 + * are met:
1.12 + *
1.13 + * - Redistributions of source code must retain the above copyright
1.14 + * notice, this list of conditions and the following disclaimer.
1.15 + *
1.16 + * - Redistributions in binary form must reproduce the above copyright
1.17 + * notice, this list of conditions and the following disclaimer in the
1.18 + * documentation and/or other materials provided with the distribution.
1.19 + *
1.20 + * - Neither the name of Oracle nor the names of its
1.21 + * contributors may be used to endorse or promote products derived
1.22 + * from this software without specific prior written permission.
1.23 + *
1.24 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.25 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1.26 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.27 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.28 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.29 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.30 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.31 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.32 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.33 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.34 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.35 + */
1.36 +
1.37 +// Simple Java "shell" with which you can try out
1.38 +// your few liner Java code leaving imports, main etc.
1.39 +// And you can leave even compilation as this script
1.40 +// takes care boilerplate+compile step for you.
1.41 +
1.42 +// Java types used
1.43 +var Arrays = Java.type("java.util.Arrays");
1.44 +var BufferedReader = Java.type("java.io.BufferedReader");
1.45 +var FileWriter = Java.type("java.io.FileWriter");
1.46 +var LocalDateTime = Java.type("java.time.LocalDateTime");
1.47 +var InputStreamReader = Java.type("java.io.InputStreamReader");
1.48 +var PrintWriter = Java.type("java.io.PrintWriter");
1.49 +var ProcessBuilder = Java.type("java.lang.ProcessBuilder");
1.50 +var System = Java.type("java.lang.System");
1.51 +
1.52 +// read multiple lines of input from stdin till user
1.53 +// enters an empty line
1.54 +function input(endMarker, prompt) {
1.55 + if (!endMarker) {
1.56 + endMarker = "";
1.57 + }
1.58 +
1.59 + if (!prompt) {
1.60 + prompt = " >> ";
1.61 + }
1.62 +
1.63 + var str = "";
1.64 + var reader = new BufferedReader(new InputStreamReader(System.in));
1.65 + var line;
1.66 + while (true) {
1.67 + System.out.print(prompt);
1.68 + line = reader.readLine();
1.69 + if (line == null || line == endMarker) {
1.70 + break;
1.71 + }
1.72 + str += line + "\n";
1.73 + }
1.74 + return str;
1.75 +}
1.76 +
1.77 +// write the string to the given file
1.78 +function writeTo(file, str) {
1.79 + var w = new PrintWriter(new FileWriter(file));
1.80 + try {
1.81 + w.print(str);
1.82 + } finally {
1.83 + w.close();
1.84 + }
1.85 +}
1.86 +
1.87 +// generate Java code with user's input
1.88 +// put inside generated main method
1.89 +function generate(className) {
1.90 + var usercode = input();
1.91 + if (usercode == "") {
1.92 + return false;
1.93 + }
1.94 +
1.95 + var fullcode = <<EOF
1.96 +// userful imports, add more here if you want
1.97 +// more imports.
1.98 +import static java.lang.System.*;
1.99 +import java.io.*;
1.100 +import java.net.*;
1.101 +import java.math.*;
1.102 +import java.nio.file.*;
1.103 +import java.time.*;
1.104 +import java.time.chrono.*;
1.105 +import java.time.format.*;
1.106 +import java.time.temporal.*;
1.107 +import java.time.zone.*;
1.108 +import java.util.*;
1.109 +import java.util.concurrent.*;
1.110 +import java.util.function.*;
1.111 +import java.util.stream.*;
1.112 +
1.113 +public class ${className} {
1.114 + public static void main(String[] args) throws Exception {
1.115 + ${usercode}
1.116 + }
1.117 +}
1.118 +EOF
1.119 +
1.120 + writeTo("${className}.java", fullcode);
1.121 + return true;
1.122 +}
1.123 +
1.124 +// execute code command
1.125 +function exec(args) {
1.126 + // build child process and start it!
1.127 + new ProcessBuilder(Arrays.asList(args.split(' ')))
1.128 + .inheritIO()
1.129 + .start()
1.130 + .waitFor();
1.131 +}
1.132 +
1.133 +// generate unique name
1.134 +function uniqueName() {
1.135 + var now = LocalDateTime.now().toString();
1.136 + // replace unsafe chars with '_'
1.137 + return "JavaShell" + now.replace(/-|:|\./g, '_');
1.138 +}
1.139 +
1.140 +// read-compile-run loop
1.141 +while(true) {
1.142 + var className = uniqueName();
1.143 + if (generate(className)) {
1.144 + exec("javac ${className}.java");
1.145 + exec("java ${className}");
1.146 + } else {
1.147 + break;
1.148 + }
1.149 +}
