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: package org.jatha.machine;
26:
27: import org.jatha.Jatha;
28: import org.jatha.dynatype.LispInteger;
29: import org.jatha.dynatype.LispValue;
30:
31: // @date Sat Feb 1 22:18:53 1997
32: /**
33: * opLIS is not in the Kogge book. I added it to handle functions with
34: * a variable number of args. It assembles a list from the top N items
35: * on the S, and pushes the list onto the stack.
36: *
37: * Uses C register (2 values).
38: * Modifes S registers.
39: * @see SECDMachine
40: */
41: class opLIS extends SECDop {
42: /**
43: * It calls <tt>SECDop()</tt> with the machine argument
44: * and the label of this instruction.
45: * @see SECDMachine
46: */
47: //@author Micheal S. Hewett hewett@cs.stanford.edu
48: public opLIS(Jatha lisp) {
49: super (lisp, "LIS");
50: }
51:
52: public void Execute(SECDMachine machine) {
53: long numArgs;
54: LispValue argList = f_lisp.NIL;
55:
56: machine.C.pop(); /* Pop the LIS command. */
57:
58: numArgs = ((LispInteger) machine.C.pop()).getLongValue(); /* Pop the number of args. */
59: for (int i = 0; i < numArgs; ++i)
60: argList = f_lisp.makeCons(machine.S.pop(), argList);
61:
62: machine.S.push(argList);
63: }
64:
65: public LispValue grindef(LispValue code, int indentAmount) {
66: indent(indentAmount);
67:
68: System.out.print(functionName);
69: indent(5);
70: code.second().internal_princ(System.out);
71:
72: f_lisp.NEWLINE.internal_princ(System.out);
73:
74: return code.cdr().cdr();
75: }
76: }
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