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: /**
32: * This is the class that encapsulates the action and
33: * compilation of the FUNCTION function.
34: *
35: */
36: public class FunctionPrimitive extends LispPrimitive {
37: public static boolean DEBUG = false;
38:
39: public FunctionPrimitive(Jatha lisp) {
40: super (lisp, "FUNCTION", 1);
41: }
42:
43: public void Execute(SECDMachine machine) {
44: LispValue arg = machine.S.pop();
45:
46: if (DEBUG)
47: System.err.println("FunctionPrimitive.Execute: arg = "
48: + arg.toString() + ", type = " + arg.type_of());
49:
50: // arg may be a symbol or a lambda expression
51: if (arg.basic_symbolp())
52: machine.S.push(arg.symbol_function());
53: else
54: machine.S.push(arg);
55:
56: machine.C.pop();
57: }
58:
59: /**
60: * The argument is not evaluated.
61: * @param compiler
62: * @param machine
63: * @param args
64: * @param valueList
65: * @param code
66: * @throws CompilerException
67: */
68: public LispValue CompileArgs(LispCompiler compiler,
69: SECDMachine machine, LispValue args, LispValue valueList,
70: LispValue code) throws CompilerException {
71: return compiler.compileConstantArgsLeftToRight(machine, args,
72: valueList, code);
73: }
74: }
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