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