libguile/gsubr.c

   1 /*      Copyright (C) 1995,1996 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 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45 #include "genio.h"
  46 #include "procprop.h"
  47
  48 #include "gsubr.h"
  49 \f
  50 /*
  51  * gsubr.c
  52  * Provide `gsubrs' -- subrs taking a prescribed number of required, optional,
  53  * and rest arguments.
  54  */
  55
  56 #include "gsubr.h"
  57
  58 #define GSUBR_TEST 1
  59
  60 #define GSUBR_MAKTYPE(req, opt, rst) ((req)|((opt)<<4)|((rst)<<8))
  61 #define GSUBR_REQ(x) ((int)(x)&0xf)
  62 #define GSUBR_OPT(x) (((int)(x)&0xf0)>>4)
  63 #define GSUBR_REST(x) ((int)(x)>>8)
  64
  65 #define GSUBR_MAX 10
  66 #define GSUBR_TYPE(cclo) (SCM_VELTS(cclo)[1])
  67 #define GSUBR_PROC(cclo) (SCM_VELTS(cclo)[2])
  68
  69 SCM scm_i_name;
  70 SCM scm_i_inner_name;
  71 static SCM f_gsubr_apply;
  72
  73 SCM
  74 scm_make_gsubr(name, req, opt, rst, fcn)
  75      char *name;
  76      int req;
  77      int opt;
  78      int rst;
  79      SCM (*fcn)();
  80 {
  81   switch GSUBR_MAKTYPE(req, opt, rst) {
  82   case GSUBR_MAKTYPE(0, 0, 0): return scm_make_subr(name, scm_tc7_subr_0, fcn);
  83   case GSUBR_MAKTYPE(1, 0, 0): return scm_make_subr(name, scm_tc7_subr_1, fcn);
  84   case GSUBR_MAKTYPE(0, 1, 0): return scm_make_subr(name, scm_tc7_subr_1o, fcn);
  85   case GSUBR_MAKTYPE(1, 1, 0): return scm_make_subr(name, scm_tc7_subr_2o, fcn);
  86   case GSUBR_MAKTYPE(2, 0, 0): return scm_make_subr(name, scm_tc7_subr_2, fcn);
  87   case GSUBR_MAKTYPE(3, 0, 0): return scm_make_subr(name, scm_tc7_subr_3, fcn);
  88   case GSUBR_MAKTYPE(0, 0, 1): return scm_make_subr(name, scm_tc7_lsubr, fcn);
  89   case GSUBR_MAKTYPE(2, 0, 1): return scm_make_subr(name, scm_tc7_lsubr_2, fcn);
  90   default:
  91     {
  92       SCM symcell = scm_sysintern(name, SCM_UNDEFINED);
  93       SCM z, cclo = scm_makcclo(f_gsubr_apply, 3L);
  94       long tmp = ((((SCM_CELLPTR)(SCM_CAR(symcell)))-scm_heap_org)<<8);
  95       if (GSUBR_MAX < req + opt + rst) {
  96         fputs("ERROR in scm_make_gsubr: too many args\n", stderr);
  97         exit (1);
  98       }
  99       if ((tmp>>8) != ((SCM_CELLPTR)(SCM_CAR(symcell))-scm_heap_org))
 100         tmp = 0;
 101       SCM_NEWCELL(z);
 102       SCM_SUBRF(z) = fcn;
 103       SCM_SETCAR (z, tmp + scm_tc7_subr_0);
 104       GSUBR_PROC(cclo) = z;
 105       GSUBR_TYPE(cclo) = SCM_MAKINUM(GSUBR_MAKTYPE(req, opt, rst));
 106       SCM_SETCDR (symcell, cclo);
 107 #ifdef DEBUG_EXTENSIONS
 108       if (SCM_REC_PROCNAMES_P)
 109         scm_set_procedure_property_x (cclo, scm_i_name, SCM_CAR (symcell));
 110 #endif
 111       return cclo;
 112     }
 113   }
 114 }
 115
 116
 117 SCM_PROC(s_gsubr_apply, "gsubr-apply", 0, 0, 1, scm_gsubr_apply);
 118
 119 SCM
 120 scm_gsubr_apply(args)
 121      SCM args;
 122 {
 123   SCM self = SCM_CAR(args);
 124   SCM (*fcn)() = SCM_SUBRF(GSUBR_PROC(self));
 125   SCM v[10];                    /* must agree with greatest supported arity */
 126   int typ = SCM_INUM(GSUBR_TYPE(self));
 127   int i, n = GSUBR_REQ(typ) + GSUBR_OPT(typ) + GSUBR_REST(typ);
 128 #if 0
 129   SCM_ASSERT(n <= sizeof(v)/sizeof(SCM),
 130              self, "internal programming error", s_gsubr_apply);
 131 #endif
 132   args = SCM_CDR(args);
 133   for (i = 0; i < GSUBR_REQ(typ); i++) {
 134 #ifndef RECKLESS
 135     if (SCM_IMP(args))
 136       wnargs: scm_wrong_num_args (SCM_SNAME(GSUBR_PROC(self)));
 137 #endif
 138     v[i] = SCM_CAR(args);
 139     args = SCM_CDR(args);
 140   }
 141   for (; i < GSUBR_REQ(typ) + GSUBR_OPT(typ); i++) {
 142     if (SCM_NIMP(args)) {
 143       v[i] = SCM_CAR(args);
 144       args = SCM_CDR(args);
 145     }
 146     else
 147       v[i] = SCM_UNDEFINED;
 148   }
 149   if (GSUBR_REST(typ))
 150     v[i] = args;
 151   else
 152     SCM_ASRTGO(SCM_NULLP(args), wnargs);
 153   switch (n) {
 154   case 2: return (*fcn)(v[0], v[1]);
 155   case 3: return (*fcn)(v[0], v[1], v[2]);
 156   case 4: return (*fcn)(v[0], v[1], v[2], v[3]);
 157   case 5: return (*fcn)(v[0], v[1], v[2], v[3], v[4]);
 158   case 6: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5]);
 159   case 7: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6]);
 160   case 8: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]);
 161   case 9: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]);
 162   case 10: return (*fcn)(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]);
 163   }
 164 }
 165
 166
 167 #ifdef GSUBR_TEST
 168 /* A silly example, taking 2 required args, 1 optional, and
 169    a scm_list of rest args
 170    */
 171 SCM
 172 gsubr_21l(req1, req2, opt, rst)
 173      SCM req1, req2, opt, rst;
 174 {
 175   scm_gen_puts (scm_regular_string, "gsubr-2-1-l:\n req1: ", scm_cur_outp);
 176   scm_display(req1, scm_cur_outp);
 177   scm_gen_puts (scm_regular_string, "\n req2: ", scm_cur_outp);
 178   scm_display(req2, scm_cur_outp);
 179   scm_gen_puts (scm_regular_string, "\n opt: ", scm_cur_outp);
 180   scm_display(opt, scm_cur_outp);
 181   scm_gen_puts (scm_regular_string, "\n rest: ", scm_cur_outp);
 182   scm_display(rst, scm_cur_outp);
 183   scm_newline(scm_cur_outp);
 184   return SCM_UNSPECIFIED;
 185 }
 186 #endif
 187
 188
 189
 190 void
 191 scm_init_gsubr()
 192 {
 193   f_gsubr_apply = scm_make_subr(s_gsubr_apply, scm_tc7_lsubr, scm_gsubr_apply);
 194   scm_i_name = SCM_CAR (scm_sysintern ("name", SCM_UNDEFINED));
 195   scm_permanent_object (scm_i_name);
 196   scm_i_inner_name = SCM_CAR (scm_sysintern ("inner-name", SCM_UNDEFINED));
 197   scm_permanent_object (scm_i_inner_name);
 198 #ifdef GSUBR_TEST
 199   scm_make_gsubr("gsubr-2-1-l", 2, 1, 1, gsubr_21l); /* example */
 200 #endif
 201 }