lily/lily-guile.cc

   1 /*
   2   lily-guile.cc -- implement assorted guile functions
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   Han-Wen Nienhuys <hanwen@cs.uu.nl>
   9 */
  10
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <math.h>               // isinf
  15
  16 #include "libc-extension.hh"
  17 #include "lily-guile.hh"
  18 #include "main.hh"
  19 #include "simple-file-storage.hh"
  20 #include "file-path.hh"
  21 #include "debug.hh"
  22 #include "direction.hh"
  23 #include "offset.hh"
  24 #include "interval.hh"
  25
  26 SCM
  27 ly_str02scm (char const*c)
  28 {
  29   // this all really sucks, guile should take char const* arguments!
  30   return gh_str02scm ((char*)c);
  31 }
  32
  33
  34
  35 /*
  36   Pass string to scm parser, evaluate one expression.
  37   Return result value and #chars read.
  38
  39   Thanks to Gary Houston <ghouston@freewire.co.uk>
  40
  41   Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
  42 */
  43 SCM
  44 ly_parse_scm (char const* s, int* n)
  45 {
  46   SCM str = gh_str02scm ((char*)s);
  47   SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
  48                             "scm_eval_0str");
  49   SCM from = scm_ftell (port);
  50
  51   SCM form;
  52   SCM answer = SCM_UNSPECIFIED;
  53
  54   /* Read expression from port */
  55   if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
  56     answer = scm_eval_x (form);
  57
  58   /*
  59    After parsing
  60
  61        (begin (foo 1 2))
  62
  63    all seems fine, but after parsing
  64
  65        (foo 1 2)
  66
  67    read_buf has been advanced to read_pos - 1,
  68    so that scm_ftell returns 1, instead of #parsed chars
  69    */
  70
  71   /*
  72     urg: reset read_buf for scm_ftell
  73     shouldn't scm_read () do this for us?
  74   */
  75   scm_fill_input (port);
  76   SCM to = scm_ftell (port);
  77   *n = gh_scm2int (to) - gh_scm2int (from);
  78
  79   /* Don't close the port here; if we re-enter this function via a
  80      continuation, then the next time we enter it, we'll get an error.
  81      It's a string port anyway, so there's no advantage to closing it
  82      early.
  83
  84      scm_close_port (port);
  85   */
  86
  87   return answer;
  88 }
  89
  90 SCM
  91 ly_quote_scm (SCM s)
  92 {
  93   return gh_list (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
  94 }
  95
  96
  97 SCM
  98 ly_symbol2scm(const char *s)
  99 {
 100   return gh_symbol2scm ((char *)s);
 101 }
 102
 103 String
 104 ly_symbol2string (SCM s)
 105 {
 106   assert (gh_symbol_p (s));
 107   return String((Byte*)SCM_CHARS (s), (int) SCM_LENGTH(s));
 108 }
 109
 110
 111 String
 112 gulp_file_to_string (String fn)
 113 {
 114   String s = global_path.find (fn);
 115   if (s == "")
 116     {
 117       String e = _f ("can't find file: `%s'", fn);
 118       e += " ";
 119       e += _f ("(load path: `%s')", global_path.str ());
 120       error (e);
 121     }
 122   else if (verbose_global_b)
 123     progress_indication ("[" + s );
 124
 125
 126   Simple_file_storage f(s);
 127   String result (f.ch_C());
 128   if (verbose_global_b)
 129     progress_indication ("]");
 130   return result;
 131 }
 132
 133 SCM
 134 ly_gulp_file (SCM fn)
 135 {
 136   return ly_str02scm (gulp_file_to_string (ly_scm2string (fn)).ch_C());
 137 }
 138
 139
 140 /**
 141    Read a file, and shove it down GUILE.  GUILE also has file read
 142    functions, but you can't fiddle with the path of those.
 143  */
 144 void
 145 read_lily_scm_file (String fn)
 146 {
 147   gh_eval_str ((char *) gulp_file_to_string (fn).ch_C());
 148 }
 149
 150
 151 void
 152 ly_display_scm (SCM s)
 153 {
 154   gh_display (s);
 155   gh_newline ();
 156 }
 157
 158 String
 159 ly_scm2string (SCM s)
 160 {
 161   assert (gh_string_p (s));
 162   int len;
 163   char * p = gh_scm2newstr (s , &len);
 164
 165   String r (p);
 166
 167   free (p);
 168   return r;
 169 }
 170
 171 SCM
 172 index_cell (SCM s, Direction d)
 173 {
 174   assert (d);
 175   return (d == LEFT) ? gh_car  (s) : gh_cdr (s);
 176 }
 177
 178 SCM
 179 index_set_cell (SCM s, Direction d, SCM v)
 180 {
 181   if (d == LEFT)
 182     gh_set_car_x (s, v);
 183   else if (d == RIGHT)
 184     gh_set_cdr_x (s, v);
 185   return s;
 186 }
 187
 188 SCM
 189 ly_warning (SCM str)
 190 {
 191   assert (gh_string_p (str));
 192   warning ("lily-guile: " + ly_scm2string (str));
 193   return SCM_BOOL_T;
 194 }
 195
 196 SCM
 197 ly_isdir_p (SCM s)
 198 {
 199   if (gh_number_p (s))
 200     {
 201       int i = gh_scm2int (s);
 202       return (i>= -1 && i <= 1)  ? SCM_BOOL_T : SCM_BOOL_F;
 203     }
 204   return SCM_BOOL_F;
 205 }
 206
 207
 208
 209 typedef void (*Void_fptr)();
 210 Array<Void_fptr> *scm_init_funcs_;
 211
 212 void add_scm_init_func (void (*f)())
 213 {
 214   if (!scm_init_funcs_)
 215     scm_init_funcs_ = new Array<Void_fptr>;
 216
 217   scm_init_funcs_->push (f);
 218 }
 219
 220 void
 221 init_lily_guile ()
 222 {
 223   for (int i=scm_init_funcs_->size() ; i--;)
 224     (scm_init_funcs_->elem (i)) ();
 225 }
 226
 227 unsigned int ly_scm_hash (SCM s)
 228 {
 229   return scm_ihashv (s, ~1u);
 230 }
 231
 232
 233
 234 bool
 235 isdir_b (SCM s)
 236 {
 237   if (gh_number_p (s))
 238     {
 239       int i = gh_scm2int (s);
 240       return i>= -1 && i <= 1;
 241     }
 242   return false;
 243 }
 244
 245 Direction
 246 to_dir (SCM s)
 247 {
 248   return (Direction) gh_scm2int (s);
 249 }
 250
 251 Interval
 252 ly_scm2interval (SCM p)
 253 {
 254   return  Interval (gh_scm2double (gh_car (p)),
 255                     gh_scm2double (gh_cdr (p)));
 256 }
 257
 258 SCM
 259 ly_interval2scm (Interval i)
 260 {
 261   return gh_cons (gh_double2scm (i[LEFT]),
 262                   gh_double2scm (i[RIGHT]));
 263 }
 264
 265
 266 bool
 267 to_boolean (SCM s)
 268 {
 269   return gh_boolean_p (s) && gh_scm2bool (s);
 270 }
 271
 272 /*
 273   Appendable list L: the cdr contains the list, the car the last cons
 274   in the list.
 275  */
 276 SCM
 277 appendable_list ()
 278 {
 279   SCM s = gh_cons (SCM_EOL, SCM_EOL);
 280   gh_set_car_x (s, s);
 281
 282   return s;
 283 }
 284
 285 void
 286 appendable_list_append (SCM l, SCM elt)
 287 {
 288   SCM newcons = gh_cons (elt, SCM_EOL);
 289
 290   gh_set_cdr_x (gh_car (l), newcons);
 291   gh_set_car_x (l, newcons);
 292 }
 293
 294
 295 SCM
 296 ly_offset2scm (Offset o)
 297 {
 298   return gh_cons (gh_double2scm (o[X_AXIS]), gh_double2scm(o[Y_AXIS]));
 299 }
 300
 301 Offset
 302 ly_scm2offset (SCM s)
 303 {
 304   return Offset (gh_scm2double (gh_car (s)),
 305                  gh_scm2double (gh_cdr (s)));
 306 }
 307
 308 SCM
 309 ly_type (SCM exp)
 310 {
 311   char const  * cp = "unknown";
 312   if (gh_number_p (exp))
 313     {
 314       cp = "number";
 315     }
 316   else if (gh_string_p (exp))
 317     {
 318       cp = "string";
 319     }
 320   else if (gh_procedure_p (exp))
 321     {
 322       cp = "procedure";
 323     }
 324   else if (gh_boolean_p (exp))
 325     {
 326       cp = "boolean";
 327     }
 328   else if (gh_pair_p (exp))
 329     {
 330       cp = "list";
 331     }
 332
 333   return ly_str02scm (cp);
 334 }
 335
 336 /*
 337   convert without too many decimals, and leave  a space at the end.
 338  */
 339
 340
 341 SCM
 342 ly_number2string (SCM s)
 343 {
 344   assert (gh_number_p (s));
 345
 346   char str[100];                        // ugh.
 347
 348   if (scm_integer_p (s) == SCM_BOOL_F)
 349     {
 350       Real r (gh_scm2double (s));
 351
 352       if (isinf (r) || isnan (r))
 353         {
 354           programming_error ("Infinity or NaN encountered while converting Real number; setting to zero.");
 355           r = 0.0;
 356         }
 357
 358       sprintf (str, "%8.4f ", r);
 359     }
 360   else
 361     {
 362       sprintf (str, "%d ", gh_scm2int (s));
 363     }
 364
 365   return gh_str02scm (str);
 366 }
 367
 368 /*
 369   Undef this to see if GUILE GC is causing too many swaps.
 370  */
 371
 372 // #define TEST_GC
 373
 374 #ifdef TEST_GC
 375 #include <libguile/gc.h>
 376
 377 static void *
 378 greet_sweep (void *dummy1, void *dummy2, void *dummy3)
 379 {
 380    fprintf(stderr, "entering sweep\n");
 381 }
 382
 383 static void *
 384 wave_sweep_goodbye (void *dummy1, void *dummy2, void *dummy3)
 385 {
 386    fprintf(stderr, "leaving sweep\n");
 387 }
 388 #endif
 389
 390 SCM
 391 undefd ()
 392 {
 393   return SCM_UNDEFINED;
 394 }
 395
 396 static void
 397 init_functions ()
 398 {
 399   scm_make_gsubr ("ly-warn", 1, 0, 0, (SCM(*)(...))ly_warning);
 400   scm_make_gsubr ("ly-gulp-file", 1,0, 0, (SCM(*)(...))ly_gulp_file);
 401   scm_make_gsubr ("dir?", 1,0, 0, (SCM(*)(...))ly_isdir_p);
 402   scm_make_gsubr ("undefd", 0,0, 0, (SCM(*)(...))undefd);
 403   scm_make_gsubr ("ly-number->string", 1, 0,0, (SCM(*)(...)) ly_number2string);
 404
 405
 406 #ifdef TEST_GC
 407   scm_c_hook_add (&scm_before_mark_c_hook, greet_sweep, 0, 0);
 408   scm_c_hook_add (&scm_before_sweep_c_hook, wave_sweep_goodbye, 0, 0);
 409 #endif
 410
 411 }
 412
 413 ADD_SCM_INIT_FUNC(funcs, init_functions);
 414
 415 SCM
 416 ly_deep_copy (SCM l)
 417 {
 418   if (gh_pair_p (l))
 419     {
 420       return gh_cons (ly_deep_copy (gh_car (l)), ly_deep_copy (gh_cdr (l)));
 421     }
 422   else
 423     return l;
 424 }
 425
 426