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 static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
  29 
  30 import java.awt.Desktop;
  31 import java.awt.GraphicsEnvironment;
  32 import java.io.BufferedReader;
  33 import java.io.File;
  34 import java.io.InputStream;
  35 import java.io.InputStreamReader;
  36 import java.io.IOException;
  37 import java.io.OutputStream;
  38 import java.io.PrintWriter;
  39 import java.net.URI;
  40 import java.util.concurrent.Callable;
  41 import java.util.function.Consumer;
  42 import java.util.function.Function;
  43 import jdk.internal.jline.console.completer.Completer;
  44 import jdk.internal.jline.console.UserInterruptException;
  45 import jdk.nashorn.api.scripting.NashornException;
  46 import jdk.nashorn.internal.objects.Global;
  47 import jdk.nashorn.internal.objects.NativeJava;
  48 import jdk.nashorn.internal.runtime.Context;
  49 import jdk.nashorn.internal.runtime.JSType;
  50 import jdk.nashorn.internal.runtime.Property;
  51 import jdk.nashorn.internal.runtime.ScriptEnvironment;
  52 import jdk.nashorn.internal.runtime.ScriptFunction;
  53 import jdk.nashorn.internal.runtime.ScriptRuntime;
  54 import jdk.nashorn.tools.Shell;
  55 
  56 /**
  57  * Interactive command line Shell for Nashorn.
  58  */
  59 public final class Main extends Shell {
  60     private Main() {}
  61 
  62     static final boolean DEBUG = Boolean.getBoolean("nashorn.jjs.debug");
  63     static final boolean HEADLESS = GraphicsEnvironment.isHeadless();
  64 
  65     // file where history is persisted.
  66     private static final File HIST_FILE = new File(new File(System.getProperty("user.home")), ".jjs.history");
  67 
  68     /**
  69      * Main entry point with the default input, output and error streams.
  70      *
  71      * @param args The command line arguments
  72      */
  73     public static void main(final String[] args) {
  74         try {
  75             final int exitCode = main(System.in, System.out, System.err, args);
  76             if (exitCode != SUCCESS) {
  77                 System.exit(exitCode);
  78             }
  79         } catch (final IOException e) {
  80             System.err.println(e); //bootstrapping, Context.err may not exist
  81             System.exit(IO_ERROR);
  82         }
  83     }
  84 
  85     /**
  86      * Starting point for executing a {@code Shell}. Starts a shell with the
  87      * given arguments and streams and lets it run until exit.
  88      *
  89      * @param in input stream for Shell
  90      * @param out output stream for Shell
  91      * @param err error stream for Shell
  92      * @param args arguments to Shell
  93      *
  94      * @return exit code
  95      *
  96      * @throws IOException if there's a problem setting up the streams
  97      */
  98     public static int main(final InputStream in, final OutputStream out, final OutputStream err, final String[] args) throws IOException {
  99         return new Main().run(in, out, err, args);
 100     }
 101 
 102 
 103     /**
 104      * read-eval-print loop for Nashorn shell.
 105      *
 106      * @param context the nashorn context
 107      * @param global  global scope object to use
 108      * @return return code
 109      */
 110     protected int readEvalPrint(final Context context, final Global global) {
 111         final ScriptEnvironment env = context.getEnv();
 112         final String prompt = bundle.getString("shell.prompt");
 113         final String prompt2 = bundle.getString("shell.prompt2");
 114         final PrintWriter err = context.getErr();
 115         final Global oldGlobal = Context.getGlobal();
 116         final boolean globalChanged = (oldGlobal != global);
 117         final PropertiesHelper propsHelper = new PropertiesHelper(env._classpath);
 118         final NashornCompleter completer = new NashornCompleter(context, global, this, propsHelper);
 119 
 120         try (final Console in = new Console(System.in, System.out, HIST_FILE, completer,
 121                 str -> {
 122                     try {
 123                         final Object res = context.eval(global, str, global, "<shell>");
 124                         if (res != null && res != UNDEFINED) {
 125                             // Special case Java types: show the javadoc for the class.
 126                             if (NativeJava.isType(UNDEFINED, res)) {
 127                                 openBrowserForJavadoc(NativeJava.typeName(UNDEFINED, res).toString());
 128                             }
 129 
 130                             if (res instanceof ScriptFunction) {
 131                                 return ((ScriptFunction)res).getDocumentation();
 132                             }
 133 
 134                             // FIXME: better than toString for other cases?
 135                             return JSType.toString(res);
 136                         }
 137                      } catch (Exception ignored) {
 138                      }
 139                      return null;
 140                 })) {
 141 
 142             if (globalChanged) {
 143                 Context.setGlobal(global);
 144             }
 145 
 146             global.addShellBuiltins();
 147 
 148             if (System.getSecurityManager() == null) {
 149                 final Consumer<String> evaluator = str -> {
 150                     // could be called from different thread (GUI), we need to handle Context set/reset
 151                     final Global _oldGlobal = Context.getGlobal();
 152                     final boolean _globalChanged = (oldGlobal != global);
 153                     if (_globalChanged) {
 154                         Context.setGlobal(global);
 155                     }
 156                     try {
 157                         evalImpl(context, global, str, err, env._dump_on_error);
 158                     } finally {
 159                         if (_globalChanged) {
 160                             Context.setGlobal(_oldGlobal);
 161                         }
 162                     }
 163                 };
 164 
 165                 // expose history object for reflecting on command line history
 166                 global.addOwnProperty("history", Property.NOT_ENUMERABLE, new HistoryObject(in.getHistory(), err, evaluator));
 167 
 168                 // 'edit' command
 169                 global.addOwnProperty("edit", Property.NOT_ENUMERABLE, new EditObject(in, err::println, evaluator));
 170             }
 171 
 172             while (true) {
 173                 String source = "";
 174                 try {
 175                     source = in.readLine(prompt);
 176                 } catch (final IOException ioe) {
 177                     err.println(ioe.toString());
 178                     if (env._dump_on_error) {
 179                         ioe.printStackTrace(err);
 180                     }
 181                     return IO_ERROR;
 182                 } catch (final UserInterruptException ex) {
 183                     break;
 184                 }
 185 
 186                 if (source == null) {
 187                     break;
 188                 }
 189 
 190                 if (source.isEmpty()) {
 191                     continue;
 192                 }
 193 
 194                 try {
 195                     final Object res = context.eval(global, source, global, "<shell>");
 196                     if (res != UNDEFINED) {
 197                         err.println(toString(res, global));
 198                     }
 199                 } catch (final Exception exp) {
 200                     // Is this a ECMAScript SyntaxError at last column (of the single line)?
 201                     // If so, it is because parser expected more input but got EOF. Try to
 202                     // to more lines from the user (multiline edit support).
 203 
 204                     if (completer.isSyntaxErrorAt(exp, 1, source.length())) {
 205                         final String fullSrc = completer.readMoreLines(source, exp, in, prompt2, err);
 206 
 207                         // check if we succeeded in getting complete code.
 208                         if (fullSrc != null && !fullSrc.isEmpty()) {
 209                             evalImpl(context, global, fullSrc, err, env._dump_on_error);
 210                         } // else ignore, error reported already by 'completer.readMoreLines'
 211                     } else {
 212 
 213                         // can't read more lines to have parseable/complete code.
 214                         err.println(exp);
 215                         if (env._dump_on_error) {
 216                             exp.printStackTrace(err);
 217                         }
 218                     }
 219                 }
 220             }
 221         } catch (final Exception e) {
 222             err.println(e);
 223             if (env._dump_on_error) {
 224                 e.printStackTrace(err);
 225             }
 226         } finally {
 227             if (globalChanged) {
 228                 Context.setGlobal(oldGlobal);
 229             }
 230             try {
 231                 propsHelper.close();
 232             } catch (final Exception exp) {
 233                 if (DEBUG) {
 234                     exp.printStackTrace();
 235                 }
 236             }
 237         }
 238 
 239         return SUCCESS;
 240     }
 241 
 242     static String getMessage(final String id) {
 243         return bundle.getString(id);
 244     }
 245 
 246     private void evalImpl(final Context context, final Global global, final String source,
 247             final PrintWriter err, final boolean doe) {
 248         try {
 249             final Object res = context.eval(global, source, global, "<shell>");
 250             if (res != UNDEFINED) {
 251                 err.println(JSType.toString(res));
 252             }
 253         } catch (final Exception e) {
 254             err.println(e);
 255             if (doe) {
 256                 e.printStackTrace(err);
 257             }
 258         }
 259     }
 260 
 261     // FIXME: needs to be changed to use javase 9 docs later
 262     private static String JAVADOC_BASE = "http://download.java.net/jdk9/docs/api/";
 263 
 264     private static void openBrowserForJavadoc(String clsName) {
 265         try {
 266             final URI uri = new URI(JAVADOC_BASE + clsName.replace('.', '/') + ".html");
 267             Desktop.getDesktop().browse(uri);
 268         } catch (Exception ignored) {
 269         }
 270     }
 271 }
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