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.dynatype.*;
28: import org.jatha.machine.*;
29: import org.jatha.Jatha;
30:
31: public class InternPrimitive extends LispPrimitive {
32: public InternPrimitive(Jatha lisp) {
33: super (lisp, "INTERN", 1, 2);
34: }
35:
36: public void Execute(SECDMachine machine) {
37: LispValue args = machine.S.pop();
38: LispValue str = args.car();
39: LispValue pkgArg = args.second();
40: LispValue pkg;
41: LispValue newSymbol;
42:
43: if (str instanceof LispString) {
44: if (pkgArg == f_lisp.NIL) // No package specified
45: pkg = machine
46: .get_special_value(machine.getLisp().PACKAGE_SYMBOL);
47: // pkg = Jatha.PACKAGE;
48: else
49: pkg = machine.getLisp().findPackage(pkgArg);
50:
51: if (pkg == f_lisp.NIL) // Non-existent package
52: {
53: System.err.println("\n;; * Warning: package '" + pkgArg
54: + "' does not exist. Using default package.");
55: // pkg = Jatha.PACKAGE;
56: pkg = machine
57: .get_special_value(machine.getLisp().PACKAGE_SYMBOL);
58: }
59:
60: newSymbol = machine.getLisp().EVAL.intern((LispString) str,
61: (LispPackage) pkg);
62:
63: machine.S.push(newSymbol);
64: machine.C.pop();
65: } else {
66: System.err
67: .println("\n;; *** The first argument to INTERN is not a string");
68: }
69: }
70:
71: // 1 or 2 evaluated args
72: public LispValue CompileArgs(LispCompiler compiler,
73: SECDMachine machine, LispValue args, LispValue valueList,
74: LispValue code) throws CompilerException {
75: return compiler.compileArgsLeftToRight(args, valueList, f_lisp
76: .makeCons(machine.LIS, f_lisp.makeCons(args.length(),
77: code)));
78: }
79:
80: }
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