Main.java revision 1395:6263188b48de
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 26package jdk.nashorn.tools.jjs; 27 28import java.awt.GraphicsEnvironment; 29import java.io.BufferedReader; 30import java.io.File; 31import java.io.InputStream; 32import java.io.InputStreamReader; 33import java.io.IOException; 34import java.io.OutputStream; 35import java.io.PrintWriter; 36import java.util.function.Consumer; 37import jdk.internal.jline.console.completer.Completer; 38import jdk.internal.jline.console.UserInterruptException; 39import jdk.nashorn.api.scripting.NashornException; 40import jdk.nashorn.internal.objects.Global; 41import jdk.nashorn.internal.runtime.Context; 42import jdk.nashorn.internal.runtime.JSType; 43import jdk.nashorn.internal.runtime.Property; 44import jdk.nashorn.internal.runtime.ScriptEnvironment; 45import jdk.nashorn.internal.runtime.ScriptRuntime; 46import jdk.nashorn.tools.Shell; 47 48/** 49 * Interactive command line Shell for Nashorn. 50 */ 51public final class Main extends Shell { 52 private Main() {} 53 54 static final boolean DEBUG = Boolean.getBoolean("nashorn.jjs.debug"); 55 static final boolean HEADLESS = GraphicsEnvironment.isHeadless(); 56 57 // file where history is persisted. 58 private static final File HIST_FILE = new File(new File(System.getProperty("user.home")), ".jjs.history"); 59 60 /** 61 * Main entry point with the default input, output and error streams. 62 * 63 * @param args The command line arguments 64 */ 65 public static void main(final String[] args) { 66 try { 67 final int exitCode = main(System.in, System.out, System.err, args); 68 if (exitCode != SUCCESS) { 69 System.exit(exitCode); 70 } 71 } catch (final IOException e) { 72 System.err.println(e); //bootstrapping, Context.err may not exist 73 System.exit(IO_ERROR); 74 } 75 } 76 77 /** 78 * Starting point for executing a {@code Shell}. Starts a shell with the 79 * given arguments and streams and lets it run until exit. 80 * 81 * @param in input stream for Shell 82 * @param out output stream for Shell 83 * @param err error stream for Shell 84 * @param args arguments to Shell 85 * 86 * @return exit code 87 * 88 * @throws IOException if there's a problem setting up the streams 89 */ 90 public static int main(final InputStream in, final OutputStream out, final OutputStream err, final String[] args) throws IOException { 91 return new Main().run(in, out, err, args); 92 } 93 94 95 /** 96 * read-eval-print loop for Nashorn shell. 97 * 98 * @param context the nashorn context 99 * @param global global scope object to use 100 * @return return code 101 */ 102 protected int readEvalPrint(final Context context, final Global global) { 103 final ScriptEnvironment env = context.getEnv(); 104 final String prompt = bundle.getString("shell.prompt"); 105 final String prompt2 = bundle.getString("shell.prompt2"); 106 final PrintWriter err = context.getErr(); 107 final Global oldGlobal = Context.getGlobal(); 108 final boolean globalChanged = (oldGlobal != global); 109 final PropertiesHelper propsHelper = new PropertiesHelper(env._classpath); 110 final NashornCompleter completer = new NashornCompleter(context, global, this, propsHelper); 111 112 try (final Console in = new Console(System.in, System.out, HIST_FILE, completer)) { 113 if (globalChanged) { 114 Context.setGlobal(global); 115 } 116 117 global.addShellBuiltins(); 118 119 if (System.getSecurityManager() == null) { 120 final Consumer<String> evaluator = str -> { 121 // could be called from different thread (GUI), we need to handle Context set/reset 122 final Global _oldGlobal = Context.getGlobal(); 123 final boolean _globalChanged = (oldGlobal != global); 124 if (_globalChanged) { 125 Context.setGlobal(global); 126 } 127 try { 128 evalImpl(context, global, str, err, env._dump_on_error); 129 } finally { 130 if (_globalChanged) { 131 Context.setGlobal(_oldGlobal); 132 } 133 } 134 }; 135 136 // expose history object for reflecting on command line history 137 global.addOwnProperty("history", Property.NOT_ENUMERABLE, new HistoryObject(in.getHistory(), err, evaluator)); 138 139 // 'edit' command 140 global.addOwnProperty("edit", Property.NOT_ENUMERABLE, new EditObject(in, err::println, evaluator)); 141 } 142 143 while (true) { 144 String source = ""; 145 try { 146 source = in.readLine(prompt); 147 } catch (final IOException ioe) { 148 err.println(ioe.toString()); 149 if (env._dump_on_error) { 150 ioe.printStackTrace(err); 151 } 152 return IO_ERROR; 153 } catch (final UserInterruptException ex) { 154 break; 155 } 156 157 if (source.isEmpty()) { 158 continue; 159 } 160 161 try { 162 final Object res = context.eval(global, source, global, "<shell>"); 163 if (res != ScriptRuntime.UNDEFINED) { 164 err.println(JSType.toString(res)); 165 } 166 } catch (final Exception exp) { 167 // Is this a ECMAScript SyntaxError at last column (of the single line)? 168 // If so, it is because parser expected more input but got EOF. Try to 169 // to more lines from the user (multiline edit support). 170 171 if (completer.isSyntaxErrorAt(exp, 1, source.length())) { 172 final String fullSrc = completer.readMoreLines(source, exp, in, prompt2, err); 173 174 // check if we succeeded in getting complete code. 175 if (fullSrc != null && !fullSrc.isEmpty()) { 176 evalImpl(context, global, fullSrc, err, env._dump_on_error); 177 } // else ignore, error reported already by 'completer.readMoreLines' 178 } else { 179 180 // can't read more lines to have parseable/complete code. 181 err.println(exp); 182 if (env._dump_on_error) { 183 exp.printStackTrace(err); 184 } 185 } 186 } 187 } 188 } catch (final Exception e) { 189 err.println(e); 190 if (env._dump_on_error) { 191 e.printStackTrace(err); 192 } 193 } finally { 194 if (globalChanged) { 195 Context.setGlobal(oldGlobal); 196 } 197 try { 198 propsHelper.close(); 199 } catch (final Exception exp) { 200 if (DEBUG) { 201 exp.printStackTrace(); 202 } 203 } 204 } 205 206 return SUCCESS; 207 } 208 209 static String getMessage(final String id) { 210 return bundle.getString(id); 211 } 212 213 private void evalImpl(final Context context, final Global global, final String source, 214 final PrintWriter err, final boolean doe) { 215 try { 216 final Object res = context.eval(global, source, global, "<shell>"); 217 if (res != ScriptRuntime.UNDEFINED) { 218 err.println(JSType.toString(res)); 219 } 220 } catch (final Exception e) { 221 err.println(e); 222 if (doe) { 223 e.printStackTrace(err); 224 } 225 } 226 } 227} 228