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.compile;
26:
27: import org.jatha.Jatha;
28: import org.jatha.dynatype.*;
29: import org.jatha.machine.*;
30:
31: public class AppendPrimitive extends LispPrimitive {
32: public AppendPrimitive(Jatha lisp) {
33: super (lisp, "APPEND", 0, Long.MAX_VALUE);
34: }
35:
36: public void Execute(SECDMachine machine) {
37: LispValue args = machine.S.pop();
38:
39: machine.S.push(appendArgs(args));
40: machine.C.pop();
41: }
42:
43: // This is right-recursive so it only copies each arg once.
44: // The last arg is not copied, of course.
45: LispValue appendArgs(LispValue args) {
46: if (args.cdr() == f_lisp.NIL)
47: return args.car();
48: else
49: return args.car().append(appendArgs(args.cdr()));
50: }
51:
52: // Unlimited number of evaluated args.
53: public LispValue CompileArgs(LispCompiler compiler,
54: SECDMachine machine, LispValue args, LispValue valueList,
55: LispValue code) throws CompilerException {
56: return compiler.compileArgsLeftToRight(args, valueList, f_lisp
57: .makeCons(machine.LIS, f_lisp.makeCons(args.length(),
58: code)));
59: }
60: }
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