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