1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.tools.jjs; 27 28 import java.io.BufferedReader; 29 import java.io.File; 30 import java.io.InputStream; 31 import java.io.InputStreamReader; 32 import java.io.IOException; 33 import java.io.OutputStream; 34 import java.io.PrintWriter; 35 import jdk.internal.jline.console.completer.Completer; 36 import jdk.internal.jline.console.UserInterruptException; 37 import jdk.nashorn.api.scripting.NashornException; 38 import jdk.nashorn.internal.objects.Global; 39 import jdk.nashorn.internal.runtime.Context; 40 import jdk.nashorn.internal.runtime.JSType; 41 import jdk.nashorn.internal.runtime.Property; 42 import jdk.nashorn.internal.runtime.ScriptEnvironment; 43 import jdk.nashorn.internal.runtime.ScriptRuntime; 44 import jdk.nashorn.tools.Shell; 45 46 /** 47 * Interactive command line Shell for Nashorn. 48 */ 49 public final class Main extends Shell { 50 private Main() {} 51 52 static final boolean DEBUG = Boolean.getBoolean("nashorn.jjs.debug"); 53 54 // file where history is persisted. 55 private static final File HIST_FILE = new File(new File(System.getProperty("user.home")), ".jjs.history"); 56 57 /** 58 * Main entry point with the default input, output and error streams. 59 * 60 * @param args The command line arguments 61 */ 62 public static void main(final String[] args) { 63 try { 64 final int exitCode = main(System.in, System.out, System.err, args); 65 if (exitCode != SUCCESS) { 66 System.exit(exitCode); 67 } 68 } catch (final IOException e) { 69 System.err.println(e); //bootstrapping, Context.err may not exist 70 System.exit(IO_ERROR); 71 } 72 } 73 74 /** 75 * Starting point for executing a {@code Shell}. Starts a shell with the 76 * given arguments and streams and lets it run until exit. 77 * 78 * @param in input stream for Shell 79 * @param out output stream for Shell 80 * @param err error stream for Shell 81 * @param args arguments to Shell 82 * 83 * @return exit code 84 * 85 * @throws IOException if there's a problem setting up the streams 86 */ 87 public static int main(final InputStream in, final OutputStream out, final OutputStream err, final String[] args) throws IOException { 88 return new Main().run(in, out, err, args); 89 } 90 91 92 /** 93 * read-eval-print loop for Nashorn shell. 94 * 95 * @param context the nashorn context 96 * @param global global scope object to use 97 * @return return code 98 */ 99 protected int readEvalPrint(final Context context, final Global global) { 100 final ScriptEnvironment env = context.getEnv(); 101 final String prompt = bundle.getString("shell.prompt"); 102 final PrintWriter err = context.getErr(); 103 final Global oldGlobal = Context.getGlobal(); 104 final boolean globalChanged = (oldGlobal != global); 105 final PropertiesHelper propsHelper = new PropertiesHelper(env._classpath); 106 final Completer completer = new NashornCompleter(context, global, this, propsHelper); 107 108 try (final Console in = new Console(System.in, System.out, HIST_FILE, completer)) { 109 if (globalChanged) { 110 Context.setGlobal(global); 111 } 112 113 global.addShellBuiltins(); 114 115 if (System.getSecurityManager() == null) { 116 // expose history object for reflecting on command line history 117 global.addOwnProperty("history", Property.NOT_ENUMERABLE, new HistoryObject(in.getHistory())); 118 119 // 'edit' command 120 global.addOwnProperty("edit", Property.NOT_ENUMERABLE, new EditObject(err::println, 121 str -> { 122 // could be called from different thread (GUI), we need to handle Context set/reset 123 final Global _oldGlobal = Context.getGlobal(); 124 final boolean _globalChanged = (oldGlobal != global); 125 if (_globalChanged) { 126 Context.setGlobal(global); 127 } 128 try { 129 evalImpl(context, global, str, err, env._dump_on_error); 130 } finally { 131 if (_globalChanged) { 132 Context.setGlobal(_oldGlobal); 133 } 134 } 135 }, in)); 136 } 137 138 while (true) { 139 String source = ""; 140 try { 141 source = in.readLine(prompt); 142 } catch (final IOException ioe) { 143 err.println(ioe.toString()); 144 if (env._dump_on_error) { 145 ioe.printStackTrace(err); 146 } 147 return IO_ERROR; 148 } catch (final UserInterruptException ex) { 149 break; 150 } 151 152 if (source.isEmpty()) { 153 continue; 154 } 155 156 evalImpl(context, global, source, err, env._dump_on_error); 157 } 158 } catch (final Exception e) { 159 err.println(e); 160 if (env._dump_on_error) { 161 e.printStackTrace(err); 162 } 163 } finally { 164 if (globalChanged) { 165 Context.setGlobal(oldGlobal); 166 } 167 try { 168 propsHelper.close(); 169 } catch (final Exception exp) { 170 if (DEBUG) { 171 exp.printStackTrace(); 172 } 173 } 174 } 175 176 return SUCCESS; 177 } 178 179 private void evalImpl(final Context context, final Global global, final String source, 180 final PrintWriter err, final boolean doe) { 181 try { 182 final Object res = context.eval(global, source, global, "<shell>"); 183 if (res != ScriptRuntime.UNDEFINED) { 184 err.println(JSType.toString(res)); 185 } 186 } catch (final Exception e) { 187 err.println(e); 188 if (doe) { 189 e.printStackTrace(err); 190 } 191 } 192 } 193 }