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Java > Open Source Codes > org > armedbear > lisp > read_char_no_hang


1 /*
2  * read_char_no_hang.java
3  *
4  * Copyright (C) 2004 Peter Graves
5  * $Id: read_char_no_hang.java,v 1.3 2004/03/11 10:55:37 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 package org.armedbear.lisp;
23
24 // ### read-char-no-hang
25 // read-char-no-hang &optional input-stream eof-error-p eof-value recursive-p => char
26 public final class read_char_no_hang extends Primitive
27 {
28     private read_char_no_hang()
29     {
30         super("read-char-no-hang",
31               "&optional input-stream eof-error-p eof-value recursive-p");
32     }
33
34     public LispObject execute(LispObject[] args) throws ConditionThrowable
35     {
36         int length = args.length;
37         if (length > 4)
38             signal(new WrongNumberOfArgumentsException(this));
39         Stream stream =
40             length > 0 ? inSynonymOf(args[0]) : getStandardInput();
41         boolean eofError = length > 1 ? (args[1] != NIL) : true;
42         LispObject eofValue = length > 2 ? args[2] : NIL;
43         boolean recursive = length > 3 ? (args[3] != NIL) : false;
44         return stream.readCharNoHang(eofError, eofValue);
45     }
46
47     private static final Primitive READ_CHAR_NO_HANG = new read_char_no_hang();
48 }
49
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