libguile/gsubr.c

   1 /*      Copyright (C) 1995,1996,1997,1998, 1999 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44
  45 \f
  46
  47 #include <stdio.h>
  48 #include "libguile/_scm.h"
  49 #include "libguile/procprop.h"
  50 #include "libguile/root.h"
  51 #include "libguile/vectors.h"
  52
  53 #include "libguile/gsubr.h"
  54 \f
  55 /*
  56  * gsubr.c
  57  * Provide `gsubrs' -- subrs taking a prescribed number of required, optional,
  58  * and rest arguments.
  59  */
  60
  61 /* #define GSUBR_TEST */
  62
  63 SCM scm_sym_name;
  64 SCM scm_f_gsubr_apply;
  65
  66 SCM
  67 scm_make_gsubr(const char *name,int req,int opt,int rst,SCM (*fcn)())
  68 {
  69   switch SCM_GSUBR_MAKTYPE(req, opt, rst) {
  70   case SCM_GSUBR_MAKTYPE(0, 0, 0): return scm_make_subr(name, scm_tc7_subr_0, fcn);
  71   case SCM_GSUBR_MAKTYPE(1, 0, 0): return scm_make_subr(name, scm_tc7_subr_1, fcn);
  72   case SCM_GSUBR_MAKTYPE(0, 1, 0): return scm_make_subr(name, scm_tc7_subr_1o, fcn);
  73   case SCM_GSUBR_MAKTYPE(1, 1, 0): return scm_make_subr(name, scm_tc7_subr_2o, fcn);
  74   case SCM_GSUBR_MAKTYPE(2, 0, 0): return scm_make_subr(name, scm_tc7_subr_2, fcn);
  75   case SCM_GSUBR_MAKTYPE(3, 0, 0): return scm_make_subr(name, scm_tc7_subr_3, fcn);
  76   case SCM_GSUBR_MAKTYPE(0, 0, 1): return scm_make_subr(name, scm_tc7_lsubr, fcn);
  77   case SCM_GSUBR_MAKTYPE(2, 0, 1): return scm_make_subr(name, scm_tc7_lsubr_2, fcn);
  78   default:
  79     {
  80       SCM symcell = scm_sysintern (name, SCM_UNDEFINED);
  81       SCM cclo = scm_makcclo (scm_f_gsubr_apply, 3L);
  82       if (SCM_GSUBR_MAX < req + opt + rst) {
  83         fputs("ERROR in scm_make_gsubr: too many args\n", stderr);
  84         exit (1);
  85       }
  86       SCM_GSUBR_PROC (cclo) = scm_make_subr_opt (name, scm_tc7_subr_0, fcn, 0);
  87       SCM_GSUBR_TYPE (cclo) = SCM_MAKINUM (SCM_GSUBR_MAKTYPE (req, opt, rst));
  88       SCM_SETCDR (symcell, cclo);
  89 #ifdef DEBUG_EXTENSIONS
  90       if (SCM_REC_PROCNAMES_P)
  91         scm_set_procedure_property_x (cclo, scm_sym_name, SCM_CAR (symcell));
  92 #endif
  93       return cclo;
  94     }
  95   }
  96 }
  97
  98 SCM
  99 scm_make_gsubr_with_generic (const char *name,
 100                              int req,
 101                              int opt,
 102                              int rst,
 103                              SCM (*fcn)(),
 104                              SCM *gf)
 105 {
 106   switch SCM_GSUBR_MAKTYPE(req, opt, rst) {
 107   case SCM_GSUBR_MAKTYPE(0, 0, 0):
 108     return scm_make_subr_with_generic(name, scm_tc7_subr_0, fcn, gf);
 109   case SCM_GSUBR_MAKTYPE(1, 0, 0):
 110     return scm_make_subr_with_generic(name, scm_tc7_subr_1, fcn, gf);
 111   case SCM_GSUBR_MAKTYPE(0, 1, 0):
 112     return scm_make_subr_with_generic(name, scm_tc7_subr_1o, fcn, gf);
 113   case SCM_GSUBR_MAKTYPE(1, 1, 0):
 114     return scm_make_subr_with_generic(name, scm_tc7_subr_2o, fcn, gf);
 115   case SCM_GSUBR_MAKTYPE(2, 0, 0):
 116     return scm_make_subr_with_generic(name, scm_tc7_subr_2, fcn, gf);
 117   case SCM_GSUBR_MAKTYPE(3, 0, 0):
 118     return scm_make_subr_with_generic(name, scm_tc7_subr_3, fcn, gf);
 119   case SCM_GSUBR_MAKTYPE(0, 0, 1):
 120     return scm_make_subr_with_generic(name, scm_tc7_lsubr, fcn, gf);
 121   case SCM_GSUBR_MAKTYPE(2, 0, 1):
 122     return scm_make_subr_with_generic(name, scm_tc7_lsubr_2, fcn, gf);
 123   default:
 124     ;
 125   }
 126   scm_misc_error ("scm_make_gsubr_with_generic",
 127                   "can't make primitive-generic with this arity",
 128                   SCM_EOL);
 129   return SCM_BOOL_F; /* never reached */
 130 }
 131
 132
 133 SCM
 134 scm_gsubr_apply (SCM args)
 135 {
 136   SCM self = SCM_CAR(args);
 137   SCM (*fcn)() = SCM_SUBRF(SCM_GSUBR_PROC(self));
 138   SCM v[10];                    /* must agree with greatest supported arity */
 139   int typ = SCM_INUM(SCM_GSUBR_TYPE(self));
 140   int i, n = SCM_GSUBR_REQ(typ) + SCM_GSUBR_OPT(typ) + SCM_GSUBR_REST(typ);
 141 #if 0
 142   SCM_ASSERT(n <= sizeof(v)/sizeof(SCM),
 143              self, "internal programming error", FUNC_NAME);
 144 #endif
 145   args = SCM_CDR(args);
 146   for (i = 0; i < SCM_GSUBR_REQ(typ); i++) {
 147 #ifndef SCM_RECKLESS
 148     if (SCM_IMP(args))
 149       wnargs: scm_wrong_num_args (SCM_SNAME(SCM_GSUBR_PROC(self)));
 150 #endif
 151     v[i] = SCM_CAR(args);
 152     args = SCM_CDR(args);
 153   }
 154   for (; i < SCM_GSUBR_REQ(typ) + SCM_GSUBR_OPT(typ); i++) {
 155     if (SCM_NIMP(args)) {
 156       v[i] = SCM_CAR(args);
 157       args = SCM_CDR(args);
 158     }
 159     else
 160       v[i] = SCM_UNDEFINED;
 161   }
 162   if (SCM_GSUBR_REST(typ))
 163     v[i] = args;
 164   else
 165     SCM_ASRTGO(SCM_NULLP(args), wnargs);
 166   switch (n) {
 167   case 2: return (*fcn)(v[0], v[1]);
 168   case 3: return (*fcn)(v[0], v[1], v[2]);
 169   case 4: return (*fcn)(v[0], v[1], v[2], v[3]);
 170   case 5: return (*fcn)(v[0], v[1], v[2], v[3], v[4]);
 171   case 6: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5]);
 172   case 7: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6]);
 173   case 8: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]);
 174   case 9: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]);
 175   case 10: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]);
 176   }
 177   return SCM_BOOL_F; /* Never reached. */
 178 }
 179
 180
 181 #ifdef GSUBR_TEST
 182 /* A silly example, taking 2 required args, 1 optional, and
 183    a scm_list of rest args
 184    */
 185 SCM
 186 gsubr_21l(SCM req1, SCM req2, SCM opt, SCM rst)
 187 {
 188   scm_puts ("gsubr-2-1-l:\n req1: ", scm_cur_outp);
 189   scm_display(req1, scm_cur_outp);
 190   scm_puts ("\n req2: ", scm_cur_outp);
 191   scm_display(req2, scm_cur_outp);
 192   scm_puts ("\n opt: ", scm_cur_outp);
 193   scm_display(opt, scm_cur_outp);
 194   scm_puts ("\n rest: ", scm_cur_outp);
 195   scm_display(rst, scm_cur_outp);
 196   scm_newline(scm_cur_outp);
 197   return SCM_UNSPECIFIED;
 198 }
 199 #endif
 200
 201
 202
 203 void
 204 scm_init_gsubr()
 205 {
 206   /* GJB:FIXME:MD: Use scm_make_subr_opt instead -- gsubr-apply should not be a
 207      published primitive available at the Scheme level */
 208   scm_f_gsubr_apply = scm_make_subr_opt("gsubr-apply", scm_tc7_lsubr, scm_gsubr_apply, 0);
 209   scm_sym_name = SCM_CAR (scm_sysintern ("name", SCM_UNDEFINED));
 210   scm_permanent_object (scm_sym_name);
 211 #ifdef GSUBR_TEST
 212   scm_make_gsubr("gsubr-2-1-l", 2, 1, 1, gsubr_21l); /* example */
 213 #endif
 214 }
 215
 216 /*
 217   Local Variables:
 218   c-file-style: "gnu"
 219   End:
 220 */