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.ScriptEnvironment;
42 import jdk.nashorn.internal.runtime.ScriptRuntime;
43 import jdk.nashorn.tools.Shell;
44
45 /**
46 * Interactive command line Shell for Nashorn.
47 */
48 public final class Main extends Shell {
49 private Main() {}
50
51 // file where history is persisted.
52 private static final File HIST_FILE = new File(new File(System.getProperty("user.home")), ".jjs.history");
53
54 /**
55 * Main entry point with the default input, output and error streams.
56 *
57 * @param args The command line arguments
58 */
59 public static void main(final String[] args) {
60 try {
61 final int exitCode = main(System.in, System.out, System.err, args);
62 if (exitCode != SUCCESS) {
63 System.exit(exitCode);
64 }
65 } catch (final IOException e) {
66 System.err.println(e); //bootstrapping, Context.err may not exist
67 System.exit(IO_ERROR);
68 }
69 }
70
71 /**
72 * Starting point for executing a {@code Shell}. Starts a shell with the
73 * given arguments and streams and lets it run until exit.
74 *
75 * @param in input stream for Shell
76 * @param out output stream for Shell
77 * @param err error stream for Shell
78 * @param args arguments to Shell
79 *
80 * @return exit code
81 *
82 * @throws IOException if there's a problem setting up the streams
83 */
84 public static int main(final InputStream in, final OutputStream out, final OutputStream err, final String[] args) throws IOException {
85 return new Main().run(in, out, err, args);
86 }
87
88 /**
89 * read-eval-print loop for Nashorn shell.
90 *
91 * @param context the nashorn context
92 * @param global global scope object to use
93 * @return return code
94 */
95 protected int readEvalPrint(final Context context, final Global global) {
96 final ScriptEnvironment env = context.getEnv();
97 final String prompt = bundle.getString("shell.prompt");
98 final PrintWriter err = context.getErr();
99 final Global oldGlobal = Context.getGlobal();
100 final boolean globalChanged = (oldGlobal != global);
101 final Completer completer = new NashornCompleter(context, global);
102
103 try (final Console in = new Console(System.in, System.out, HIST_FILE, completer)) {
104 if (globalChanged) {
105 Context.setGlobal(global);
106 }
107
108 global.addShellBuiltins();
109 // expose history object for reflecting on command line history
110 global.put("history", new HistoryObject(in.getHistory()), false);
111
112 while (true) {
113 String source = "";
114 try {
115 source = in.readLine(prompt);
116 } catch (final IOException ioe) {
117 err.println(ioe.toString());
118 if (env._dump_on_error) {
119 ioe.printStackTrace(err);
120 }
121 return IO_ERROR;
122 } catch (final UserInterruptException ex) {
123 break;
124 }
125
126 if (source.isEmpty()) {
127 continue;
128 }
129
130 try {
131 final Object res = context.eval(global, source, global, "<shell>");
132 if (res != ScriptRuntime.UNDEFINED) {
133 err.println(JSType.toString(res));
134 }
135 } catch (final Exception e) {
136 err.println(e);
137 if (env._dump_on_error) {
138 e.printStackTrace(err);
139 }
140 }
141 }
142 } catch (final Exception e) {
143 err.println(e);
144 if (env._dump_on_error) {
145 e.printStackTrace(err);
146 }
147 } finally {
148 if (globalChanged) {
149 Context.setGlobal(oldGlobal);
150 }
151 }
152
153 return SUCCESS;
154 }
155 }
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