01: /*
02: * Jatha - a Common LISP-compatible LISP library in Java.
03: * Copyright (C) 1997-2005 Micheal Scott Hewett
04: *
05: * This library is free software; you can redistribute it and/or
06: * modify it under the terms of the GNU Lesser General Public
07: * License as published by the Free Software Foundation; either
08: * version 2.1 of the License, or (at your option) any later version.
09: *
10: * This library is distributed in the hope that it will be useful,
11: * but WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: * Lesser General Public License for more details.
14: *
15: * You should have received a copy of the GNU Lesser General Public
16: * License along with this library; if not, write to the Free Software
17: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18: *
19: *
20: * For further information, please contact Micheal Hewett at
21: * hewett@cs.stanford.edu
22: *
23: */
24: /**
25: * $Id: opBLK.java,v 1.1 2005/06/01 13:08:03 olagus Exp $
26: */package org.jatha.machine;
27:
28: import org.jatha.Jatha;
29: import org.jatha.dynatype.*;
30:
31: /**
32: * <p>The BLK-operation is a marker, which pops itself and it's argument from the C register. It's purpose is to be a marker for the
33: * non-local exit special forms. It's used to implement the <i>block</i> special form.</p>
34: *
35: * @author <a href="mailto:Ola.Bini@itc.ki.se">Ola Bini</a>
36: * @version $Revision: 1.1 $
37: */
38: class opBLK extends SECDop {
39: /**
40: * It calls <tt>SECDop()</tt> with the machine argument
41: * and the label of this instruction.
42: * @see SECDMachine
43: */
44: public opBLK(final Jatha lisp) {
45: super (lisp, "BLK");
46: }
47:
48: public void Execute(final SECDMachine machine) {
49: machine.C.pop(); /* Pop the BLK command. */
50: machine.C.pop(); /* Pop the tag */
51: }
52:
53: public LispValue grindef(final LispValue code,
54: final int indentAmount) {
55: indent(indentAmount);
56: System.out.print(functionName);
57: indent(5);
58: code.second().internal_princ(System.out);
59: f_lisp.NEWLINE.internal_princ(System.out);
60: return code.cdr().cdr();
61: }
62: }// opBLK
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