source: trunk/abcl/src/org/armedbear/lisp/dotimes.java @ 12594

Last change on this file since 12594 was 12288, checked in by vvoutilainen, 15 years ago

Don't extend Lisp in LispObject, static import Lisp wherever
necessary. Patch by Douglas R. Miles.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 5.1 KB
Line 
1/*
2 * dotimes.java
3 *
4 * Copyright (C) 2003-2006 Peter Graves
5 * $Id: dotimes.java 12288 2009-11-29 22:00:12Z vvoutilainen $
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20 *
21 * As a special exception, the copyright holders of this library give you
22 * permission to link this library with independent modules to produce an
23 * executable, regardless of the license terms of these independent
24 * modules, and to copy and distribute the resulting executable under
25 * terms of your choice, provided that you also meet, for each linked
26 * independent module, the terms and conditions of the license of that
27 * module.  An independent module is a module which is not derived from
28 * or based on this library.  If you modify this library, you may extend
29 * this exception to your version of the library, but you are not
30 * obligated to do so.  If you do not wish to do so, delete this
31 * exception statement from your version.
32 */
33
34package org.armedbear.lisp;
35
36import static org.armedbear.lisp.Lisp.*;
37
38public final class dotimes extends SpecialOperator
39{
40  private dotimes()
41  {
42    super(Symbol.DOTIMES);
43  }
44
45  @Override
46  public LispObject execute(LispObject args, Environment env)
47
48  {
49    LispObject bodyForm = args.cdr();
50    args = args.car();
51    Symbol var = checkSymbol(args.car());
52    LispObject countForm = args.cadr();
53    final LispThread thread = LispThread.currentThread();
54    LispObject resultForm = args.cdr().cdr().car();
55    final SpecialBindingsMark mark = thread.markSpecialBindings();
56
57    LispObject bodyAndDecls = parseBody(bodyForm, false);
58    LispObject specials = parseSpecials(bodyAndDecls.NTH(1));
59    bodyForm = bodyAndDecls.car();
60
61    LispObject blockId = new LispObject();
62    final Environment ext = new Environment(env);
63    try
64      {
65        ext.addBlock(NIL, blockId);
66
67        LispObject limit = eval(countForm, ext, thread);
68        LispObject localTags = preprocessTagBody(bodyForm, ext);
69
70        LispObject result;
71        // Establish a reusable binding.
72        final Object binding;
73        if (specials != NIL && memq(var, specials))
74          {
75            thread.bindSpecial(var, null);
76            binding = thread.getSpecialBinding(var);
77            ext.declareSpecial(var);
78          }
79        else if (var.isSpecialVariable())
80          {
81            thread.bindSpecial(var, null);
82            binding = thread.getSpecialBinding(var);
83          }
84        else
85          {
86            ext.bind(var, null);
87            binding = ext.getBinding(var);
88          }
89        while (specials != NIL)
90          {
91            ext.declareSpecial(checkSymbol(specials.car()));
92            specials = specials.cdr();
93          }
94        if (limit instanceof Fixnum)
95          {
96            int count = ((Fixnum)limit).value;
97            int i;
98            for (i = 0; i < count; i++)
99              {
100                if (binding instanceof SpecialBinding)
101                  ((SpecialBinding)binding).value = Fixnum.getInstance(i);
102                else
103                  ((Binding)binding).value = Fixnum.getInstance(i);
104
105                processTagBody(bodyForm, localTags, ext);
106
107                if (interrupted)
108                  handleInterrupt();
109              }
110            if (binding instanceof SpecialBinding)
111              ((SpecialBinding)binding).value = Fixnum.getInstance(i);
112            else
113              ((Binding)binding).value = Fixnum.getInstance(i);
114            result = eval(resultForm, ext, thread);
115          }
116        else if (limit instanceof Bignum)
117          {
118            LispObject i = Fixnum.ZERO;
119            while (i.isLessThan(limit))
120              {
121                if (binding instanceof SpecialBinding)
122                  ((SpecialBinding)binding).value = i;
123                else
124                  ((Binding)binding).value = i;
125
126                processTagBody(bodyForm, localTags, ext);
127
128                i = i.incr();
129                if (interrupted)
130                  handleInterrupt();
131              }
132            if (binding instanceof SpecialBinding)
133              ((SpecialBinding)binding).value = i;
134            else
135              ((Binding)binding).value = i;
136            result = eval(resultForm, ext, thread);
137          }
138        else
139          return error(new TypeError(limit, Symbol.INTEGER));
140        return result;
141      }
142    catch (Return ret)
143      {
144        if (ret.getBlock() == blockId)
145          {
146            return ret.getResult();
147          }
148        throw ret;
149      }
150    finally
151      {
152        thread.resetSpecialBindings(mark);
153        ext.inactive = true;
154      }
155  }
156
157  private static final dotimes DOTIMES = new dotimes();
158}
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