src/mocklisp.c

   1 /* Mocklisp compatibility functions for GNU Emacs Lisp interpreter.
   2    Copyright (C) 1985, 1986, 1995 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* Compatibility for mocklisp */
  22
  23 #include <config.h>
  24 #include "lisp.h"
  25 #include "buffer.h"
  26
  27 /* Now in lisp code ("macrocode...")
  28 * DEFUN ("ml-defun", Fml_defun, Sml_defun, 0, UNEVALLED, 0,
  29 *  "Define mocklisp functions")
  30 *  (args)
  31 *     Lisp_Object args;
  32 * {
  33 *  Lisp_Object elt;
  34 *
  35 *   while (!NILP (args))
  36 *     {
  37 *       elt = Fcar (args);
  38 *       Ffset (Fcar (elt), Fcons (Qmocklisp, Fcdr (elt)));
  39 *       args = Fcdr (args);
  40 *     }
  41 *   return Qnil;
  42 * }
  43 */
  44 \f
  45 DEFUN ("ml-if", Fml_if, Sml_if, 0, UNEVALLED, 0, "Mocklisp version of `if'.")
  46   (args)
  47      Lisp_Object args;
  48 {
  49   register Lisp_Object val;
  50   struct gcpro gcpro1;
  51
  52   GCPRO1 (args);
  53   while (!NILP (args))
  54     {
  55       val = Feval (Fcar (args));
  56       args = Fcdr (args);
  57       if (NILP (args)) break;
  58       if (XINT (val))
  59         {
  60           val = Feval (Fcar (args));
  61           break;
  62         }
  63       args = Fcdr (args);
  64     }
  65   UNGCPRO;
  66   return val;
  67 }
  68
  69 /* Now converted to regular "while" by hairier conversion code.
  70 * DEFUN ("ml-while", Fml_while, Sml_while, 1, UNEVALLED, 0, "while  for mocklisp programs")
  71 *   (args)
  72 *      Lisp_Object args;
  73 * {
  74 *   Lisp_Object test, body, tem;
  75 *   struct gcpro gcpro1, gcpro2;
  76 *
  77 *   GCPRO2 (test, body);
  78 *
  79 *   test = Fcar (args);
  80 *   body = Fcdr (args);
  81 *   while (tem = Feval (test), XINT (tem))
  82 *     {
  83 *       QUIT;
  84 *       Fprogn (body);
  85 *    }
  86 *
  87 *   UNGCPRO;
  88 *   return Qnil;
  89 *}
  90 \f
  91 /* This is the main entry point to mocklisp execution.
  92  When eval sees a mocklisp function being called, it calls here
  93  with the unevaluated argument list */
  94
  95 Lisp_Object
  96 ml_apply (function, args)
  97      Lisp_Object function, args;
  98 {
  99   register int count = specpdl_ptr - specpdl;
 100   register Lisp_Object val;
 101
 102   specbind (Qmocklisp_arguments, args);
 103   val = Fprogn (Fcdr (function));
 104   return unbind_to (count, val);
 105 }
 106
 107 DEFUN ("ml-nargs", Fml_nargs, Sml_nargs, 0, 0, 0,
 108   "Number of arguments to currently executing mocklisp function.")
 109   ()
 110 {
 111   if (EQ (Vmocklisp_arguments, Qinteractive))
 112     return make_number (0);
 113   return Flength (Vmocklisp_arguments);
 114 }
 115
 116 DEFUN ("ml-arg", Fml_arg, Sml_arg, 1, 2, 0,
 117   "Argument number N to currently executing mocklisp function.")
 118   (n, prompt)
 119      Lisp_Object n, prompt;
 120 {
 121   if (EQ (Vmocklisp_arguments, Qinteractive))
 122     return Fread_string (prompt, Qnil);
 123   CHECK_NUMBER (n, 0);
 124   XSETINT (n, XINT (n) - 1);    /* Mocklisp likes to be origin-1 */
 125   return Fcar (Fnthcdr (n, Vmocklisp_arguments));
 126 }
 127
 128 DEFUN ("ml-interactive", Fml_interactive, Sml_interactive, 0, 0, 0,
 129  "True if currently executing mocklisp function was called interactively.")
 130   ()
 131 {
 132   return (EQ (Vmocklisp_arguments, Qinteractive)) ? Qt : Qnil;
 133 }
 134 \f
 135 DEFUN ("ml-provide-prefix-argument", Fml_provide_prefix_argument, Sml_provide_prefix_argument,
 136   2, UNEVALLED, 0,
 137   "Evaluate second argument, using first argument as prefix arg value.")
 138   (args)
 139      Lisp_Object args;
 140 {
 141   struct gcpro gcpro1;
 142   GCPRO1 (args);
 143   Vcurrent_prefix_arg = Feval (Fcar (args));
 144   UNGCPRO;
 145   return Feval (Fcar (Fcdr (args)));
 146 }
 147
 148 DEFUN ("ml-prefix-argument-loop", Fml_prefix_argument_loop, Sml_prefix_argument_loop,
 149        0, UNEVALLED, 0,
 150   "")
 151   (args)
 152      Lisp_Object args;
 153 {
 154   register Lisp_Object tem;
 155   register int i;
 156   struct gcpro gcpro1;
 157
 158   /* Set `arg' in case we call a built-in function that looks at it.  Still are a few. */
 159   if (NILP (Vcurrent_prefix_arg))
 160     i = 1;
 161   else
 162     {
 163       tem = Vcurrent_prefix_arg;
 164       if (CONSP (tem))
 165         tem = Fcar (tem);
 166       if (EQ (tem, Qminus))
 167         i = -1;
 168       else i = XINT (tem);
 169     }
 170
 171   GCPRO1 (args);
 172   while (i-- > 0)
 173     Fprogn (args);
 174   UNGCPRO;
 175   return Qnil;
 176 }
 177 \f
 178 #if 0 /* Now in mlsupport.el */
 179
 180 DEFUN ("ml-substr", Fml_substr, Sml_substr, 3, 3, 0,
 181   "Return a substring of STRING, starting at index FROM and of length LENGTH.\n\
 182 If either FROM or LENGTH is negative, the length of STRING is added to it.")
 183   (string, from, to)
 184      Lisp_Object string, from, to;
 185 {
 186   CHECK_STRING (string, 0);
 187   CHECK_NUMBER (from, 1);
 188   CHECK_NUMBER (to, 2);
 189
 190   if (XINT (from) < 0)
 191     XSETINT (from, XINT (from) + XSTRING (string)->size);
 192   if (XINT (to) < 0)
 193     XSETINT (to, XINT (to) + XSTRING (string)->size);
 194   XSETINT (to, XINT (to) + XINT (from));
 195   return Fsubstring (string, from, to);
 196 }
 197 #endif /* 0 */
 198 DEFUN ("insert-string", Finsert_string, Sinsert_string, 0, MANY, 0,
 199   "Mocklisp-compatibility insert function.\n\
 200 Like the function `insert' except that any argument that is a number\n\
 201 is converted into a string by expressing it in decimal.")
 202   (nargs, args)
 203      int nargs;
 204      Lisp_Object *args;
 205 {
 206   register int argnum;
 207   register Lisp_Object tem;
 208
 209   for (argnum = 0; argnum < nargs; argnum++)
 210     {
 211       tem = args[argnum];
 212     retry:
 213       if (INTEGERP (tem))
 214         tem = Fnumber_to_string (tem);
 215       if (STRINGP (tem))
 216         insert1 (tem);
 217       else
 218         {
 219           tem = wrong_type_argument (Qstringp, tem);
 220           goto retry;
 221         }
 222     }
 223
 224   return Qnil;
 225 }
 226
 227 \f
 228 syms_of_mocklisp ()
 229 {
 230   Qmocklisp = intern ("mocklisp");
 231   staticpro (&Qmocklisp);
 232
 233 /*defsubr (&Sml_defun);*/
 234   defsubr (&Sml_if);
 235 /*defsubr (&Sml_while);*/
 236   defsubr (&Sml_arg);
 237   defsubr (&Sml_nargs);
 238   defsubr (&Sml_interactive);
 239   defsubr (&Sml_provide_prefix_argument);
 240   defsubr (&Sml_prefix_argument_loop);
 241 /*defsubr (&Sml_substr);*/
 242   defsubr (&Sinsert_string);
 243 }