1 package org.sentrysoftware.jawk;
2
3 /*-
4 * ╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲
5 * Jawk
6 * ჻჻჻჻჻჻
7 * Copyright (C) 2006 - 2023 Sentry Software
8 * ჻჻჻჻჻჻
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation, either version 3 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Lesser Public License for more details.
18 *
19 * You should have received a copy of the GNU General Lesser Public
20 * License along with this program. If not, see
21 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
22 * ╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱
23 */
24
25 import java.io.InputStream;
26 import java.io.PrintStream;
27
28 import org.sentrysoftware.jawk.util.AwkParameters;
29 import org.sentrysoftware.jawk.util.AwkSettings;
30
31 /**
32 * Entry point into the parsing, analysis, and execution/compilation
33 * of a Jawk script.
34 * This entry point is used when Jawk is executed as a stand-alone application.
35 * If you want to use Jawk as a library, please use {@see Awk}.
36 *
37 * @author Danny Daglas
38 */
39 public class Main {
40
41 /**
42 * Prohibit the instantiation of this class, other than the
43 * way required by JSR 223.
44 */
45 @SuppressWarnings("unused")
46 private Main() {}
47
48 /**
49 * Class constructor to support the JSR 223 scripting interface
50 * already provided by Java SE 6.
51 *
52 * @param args String arguments from the command-line.
53 * @param is The input stream to use as stdin.
54 * @param os The output stream to use as stdout.
55 * @param es The output stream to use as stderr.
56 * @throws java.lang.Exception enables exceptions to propagate to the callee.
57 */
58 public Main(String[] args, InputStream is, PrintStream os, PrintStream es)
59 throws Exception
60 {
61 System.setIn(is);
62 System.setOut(os);
63 System.setErr(es);
64
65 AwkSettings settings = AwkParameters.parseCommandLineArguments(args);
66 Awk awk = new Awk();
67 awk.invoke(settings);
68 }
69
70 /**
71 * The entry point to Jawk for the VM.
72 * <p>
73 * The main method is a simple call to the invoke method.
74 * The current implementation is basically as follows:
75 * <blockquote>
76 * <pre>
77 * System.exit(invoke(args));
78 * </pre>
79 * </blockquote>
80 *
81 * @param args Command line arguments to the VM.
82 */
83 public static void main(String[] args) {
84
85 try {
86 AwkSettings settings = AwkParameters.parseCommandLineArguments(args);
87 Awk awk = new Awk();
88 awk.invoke(settings);
89 } catch (ExitException e) {
90 System.exit(e.getCode());
91 } catch (Exception e) {
92 System.err.printf("%s: %s\n", e.getClass().getSimpleName(), e.getMessage());
93 System.exit(1);
94 }
95
96 }
97
98
99 }