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--2001 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_last (SCM list)
  28 {
  29   return gh_car (scm_last_pair (list));
  30 }
  31
  32 SCM
  33 ly_str02scm (char const*c)
  34 {
  35   // this all really sucks, guile should take char const* arguments!
  36   return gh_str02scm ((char*)c);
  37 }
  38
  39
  40 SCM
  41 ly_write2scm (SCM s)
  42 {
  43   SCM port = scm_mkstrport (SCM_INUM0,
  44                             scm_make_string (SCM_INUM0, SCM_UNDEFINED),
  45                             SCM_OPN | SCM_WRTNG,
  46                             "ly_write2string");
  47   //  SCM write = scm_eval_3 (ly_symbol2scm ("write"), s, SCM_EOL);
  48   SCM write = scm_eval2 (ly_symbol2scm ("write"), SCM_EOL);
  49
  50   // scm_apply (write, port, SCM_EOL);
  51   gh_call2 (write, s, port);
  52   return scm_strport_to_string (port);
  53 }
  54
  55
  56 /*
  57   Pass string to scm parser, evaluate one expression.
  58   Return result value and #chars read.
  59
  60   Thanks to Gary Houston <ghouston@freewire.co.uk>
  61
  62   Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
  63 */
  64 SCM
  65 ly_parse_scm (char const* s, int* n)
  66 {
  67   SCM str = ly_str02scm (s);
  68   SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
  69                             "ly_eval_scm_0str");
  70   SCM from = scm_ftell (port);
  71
  72   SCM form;
  73   SCM answer = SCM_UNSPECIFIED;
  74
  75   /* Read expression from port */
  76   if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
  77     answer = scm_eval_3 (form, 1, SCM_EOL); // guh?
  78
  79   /*
  80    After parsing
  81
  82  (begin (foo 1 2))
  83
  84    all seems fine, but after parsing
  85
  86  (foo 1 2)
  87
  88    read_buf has been advanced to read_pos - 1,
  89    so that scm_ftell returns 1, instead of #parsed chars
  90    */
  91
  92   /*
  93     urg: reset read_buf for scm_ftell
  94     shouldn't scm_read () do this for us?
  95   */
  96   scm_fill_input (port);
  97   SCM to = scm_ftell (port);
  98   *n = gh_scm2int (to) - gh_scm2int (from);
  99
 100   /* Don't close the port here; if we re-enter this function via a
 101      continuation, then the next time we enter it, we'll get an error.
 102      It's a string port anyway, so there's no advantage to closing it
 103      early.
 104
 105      scm_close_port (port);
 106   */
 107
 108   return answer;
 109 }
 110
 111 SCM
 112 ly_quote_scm (SCM s)
 113 {
 114   return gh_list (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
 115 }
 116
 117
 118 SCM
 119 ly_symbol2scm (const char *s)
 120 {
 121   return gh_symbol2scm ((char *)s);
 122 }
 123
 124
 125 String
 126 ly_symbol2string (SCM s)
 127 {
 128   assert (gh_symbol_p (s));
 129   return String ((Byte*)SCM_CHARS (s), (int) SCM_LENGTH (s));
 130 }
 131
 132
 133 String
 134 gulp_file_to_string (String fn)
 135 {
 136   String s = global_path.find (fn);
 137   if (s == "")
 138     {
 139       String e = _f ("can't find file: `%s'", fn);
 140       e += " ";
 141       e += _f ("(load path: `%s')", global_path.str ());
 142       error (e);
 143     }
 144   else if (verbose_global_b)
 145     progress_indication ("[" + s);
 146
 147
 148   Simple_file_storage f (s);
 149   String result (f.ch_C ());
 150   if (verbose_global_b)
 151     progress_indication ("]");
 152   return result;
 153 }
 154
 155 SCM
 156 ly_gulp_file (SCM fn)
 157 {
 158   return ly_str02scm (gulp_file_to_string (ly_scm2string (fn)).ch_C ());
 159 }
 160
 161
 162 /**
 163    Read a file, and shove it down GUILE.  GUILE also has file read
 164    functions, but you can't fiddle with the path of those.
 165  */
 166 void
 167 read_lily_scm_file (String fn)
 168 {
 169   gh_eval_str ((char *) gulp_file_to_string (fn).ch_C ());
 170 }
 171
 172 extern "C" {
 173   // maybe gdb 5.0 becomes quicker if it doesn't do fancy C++ typing?
 174 void
 175 ly_display_scm (SCM s)
 176 {
 177   gh_display (s);
 178   gh_newline ();
 179 }
 180 };
 181
 182 String
 183 ly_scm2string (SCM s)
 184 {
 185   assert (gh_string_p (s));
 186   int len;
 187   char * p = gh_scm2newstr (s , &len);
 188
 189   String r (p);
 190
 191   free (p);
 192   return r;
 193 }
 194
 195 SCM
 196 index_cell (SCM s, Direction d)
 197 {
 198   assert (d);
 199   return (d == LEFT) ? gh_car (s) : gh_cdr (s);
 200 }
 201
 202 SCM
 203 index_set_cell (SCM s, Direction d, SCM v)
 204 {
 205   if (d == LEFT)
 206     gh_set_car_x (s, v);
 207   else if (d == RIGHT)
 208     gh_set_cdr_x (s, v);
 209   return s;
 210 }
 211
 212 SCM
 213 ly_warning (SCM str)
 214 {
 215   assert (gh_string_p (str));
 216   warning ("lily-guile: " + ly_scm2string (str));
 217   return SCM_BOOL_T;
 218 }
 219
 220 SCM
 221 ly_isdir_p (SCM s)
 222 {
 223   if (gh_number_p (s))
 224     {
 225       int i = gh_scm2int (s);
 226       return (i>= -1 && i <= 1)  ? SCM_BOOL_T : SCM_BOOL_F;
 227     }
 228   return SCM_BOOL_F;
 229 }
 230
 231 bool
 232 ly_number_pair_p (SCM p)
 233 {
 234   return gh_pair_p (p) && gh_number_p (gh_car (p)) && gh_number_p (gh_cdr (p));
 235 }
 236
 237 bool
 238 ly_axis_p (SCM a)
 239 {
 240   return gh_number_p (a) && (gh_scm2int (a) == 0 || gh_scm2int (a) == 1);
 241 }
 242
 243 typedef void (*Void_fptr) ();
 244 Array<Void_fptr> *scm_init_funcs_;
 245
 246 void add_scm_init_func (void (*f) ())
 247 {
 248   if (!scm_init_funcs_)
 249     scm_init_funcs_ = new Array<Void_fptr>;
 250
 251   scm_init_funcs_->push (f);
 252 }
 253 extern  void init_cxx_function_smobs ();
 254
 255 void
 256 init_lily_guile ()
 257 {
 258   init_cxx_function_smobs ();
 259   for (int i=scm_init_funcs_->size () ; i--;)
 260  (scm_init_funcs_->elem (i)) ();
 261 }
 262
 263 unsigned int ly_scm_hash (SCM s)
 264 {
 265   return scm_ihashv (s, ~1u);
 266 }
 267
 268
 269
 270 bool
 271 isdir_b (SCM s)
 272 {
 273   if (gh_number_p (s))
 274     {
 275       int i = gh_scm2int (s);
 276       return i>= -1 && i <= 1;
 277     }
 278   return false;
 279 }
 280
 281
 282 bool
 283 isaxis_b (SCM s)
 284 {
 285   if (gh_number_p (s))
 286     {
 287       int i = gh_scm2int (s);
 288       return i== 0 || i == 1;
 289     }
 290   return false;
 291 }
 292
 293
 294 Direction
 295 to_dir (SCM s)
 296 {
 297   return (Direction) gh_scm2int (s);
 298 }
 299
 300 Interval
 301 ly_scm2interval (SCM p)
 302 {
 303   return  Interval (gh_scm2double (gh_car (p)),
 304                     gh_scm2double (gh_cdr (p)));
 305 }
 306
 307 SCM
 308 ly_interval2scm (Interval i)
 309 {
 310   return gh_cons (gh_double2scm (i[LEFT]),
 311                   gh_double2scm (i[RIGHT]));
 312 }
 313
 314
 315
 316
 317 bool
 318 to_boolean (SCM s)
 319 {
 320   return gh_boolean_p (s) && gh_scm2bool (s);
 321 }
 322
 323 /*
 324   Appendable list L: the cdr contains the list, the car the last cons
 325   in the list.
 326  */
 327 SCM
 328 appendable_list ()
 329 {
 330   SCM s = gh_cons (SCM_EOL, SCM_EOL);
 331   gh_set_car_x (s, s);
 332
 333   return s;
 334 }
 335
 336 void
 337 appendable_list_append (SCM l, SCM elt)
 338 {
 339   SCM newcons = gh_cons (elt, SCM_EOL);
 340
 341   gh_set_cdr_x (gh_car (l), newcons);
 342   gh_set_car_x (l, newcons);
 343 }
 344
 345
 346 SCM
 347 ly_offset2scm (Offset o)
 348 {
 349   return gh_cons (gh_double2scm (o[X_AXIS]), gh_double2scm (o[Y_AXIS]));
 350 }
 351
 352 Offset
 353 ly_scm2offset (SCM s)
 354 {
 355   return Offset (gh_scm2double (gh_car (s)),
 356                  gh_scm2double (gh_cdr (s)));
 357 }
 358
 359 SCM
 360 ly_type (SCM exp)
 361 {
 362   char const  * cp = "unknown";
 363   if (gh_number_p (exp))
 364     {
 365       cp = "number";
 366     }
 367   else if (gh_string_p (exp))
 368     {
 369       cp = "string";
 370     }
 371   else if (gh_procedure_p (exp))
 372     {
 373       cp = "procedure";
 374     }
 375   else if (gh_boolean_p (exp))
 376     {
 377       cp = "boolean";
 378     }
 379   else if (gh_pair_p (exp))
 380     {
 381       cp = "list";
 382     }
 383
 384   return ly_str02scm (cp);
 385 }
 386
 387 /*
 388   convert without too many decimals, and leave  a space at the end.
 389  */
 390
 391
 392 SCM
 393 ly_number2string (SCM s)
 394 {
 395   assert (gh_number_p (s));
 396
 397   char str[400];                        // ugh.
 398
 399   if (scm_integer_p (s) == SCM_BOOL_F)
 400     {
 401       Real r (gh_scm2double (s));
 402
 403       if (isinf (r) || isnan (r))
 404         {
 405           programming_error ("Infinity or NaN encountered while converting Real number; setting to zero.");
 406           r = 0.0;
 407         }
 408
 409       sprintf (str, "%8.4f ", r);
 410     }
 411   else
 412     {
 413       sprintf (str, "%d ", gh_scm2int (s));
 414     }
 415
 416   return ly_str02scm (str);
 417 }
 418
 419 /*
 420   Undef this to see if GUILE GC is causing too many swaps.
 421  */
 422
 423 // #define TEST_GC
 424
 425 #ifdef TEST_GC
 426 #include <libguile/gc.h>
 427
 428 static void *
 429 greet_sweep (void *dummy1, void *dummy2, void *dummy3)
 430 {
 431    fprintf (stderr, "entering sweep\n");
 432 }
 433
 434 static void *
 435 wave_sweep_goodbye (void *dummy1, void *dummy2, void *dummy3)
 436 {
 437    fprintf (stderr, "leaving sweep\n");
 438 }
 439 #endif
 440
 441
 442 #include "version.hh"
 443 SCM
 444 ly_version ()
 445 {
 446   char const* vs =  "\' (" MAJOR_VERSION " " MINOR_VERSION " "  PATCH_LEVEL " " MY_PATCH_LEVEL ")" ;
 447
 448
 449   return gh_eval_str ((char*)vs);
 450 }
 451
 452 static void
 453 init_functions ()
 454 {
 455   scm_make_gsubr ("ly-warn", 1, 0, 0, (Scheme_function_unknown)ly_warning);
 456   scm_make_gsubr ("ly-version", 0, 0, 0, (Scheme_function_unknown)ly_version);
 457   scm_make_gsubr ("ly-gulp-file", 1,0, 0, (Scheme_function_unknown)ly_gulp_file);
 458   scm_make_gsubr ("dir?", 1,0, 0, (Scheme_function_unknown)ly_isdir_p);
 459
 460   scm_make_gsubr ("ly-number->string", 1, 0,0, (Scheme_function_unknown) ly_number2string);
 461
 462
 463 #ifdef TEST_GC
 464   scm_c_hook_add (&scm_before_mark_c_hook, greet_sweep, 0, 0);
 465   scm_c_hook_add (&scm_before_sweep_c_hook, wave_sweep_goodbye, 0, 0);
 466 #endif
 467 }
 468
 469 ADD_SCM_INIT_FUNC (funcs, init_functions);
 470
 471 SCM
 472 ly_deep_copy (SCM l)
 473 {
 474   if (gh_pair_p (l))
 475     {
 476       return gh_cons (ly_deep_copy (gh_car (l)), ly_deep_copy (gh_cdr (l)));
 477     }
 478   else
 479     return l;
 480 }
 481
 482
 483
 484
 485 SCM
 486 ly_assoc_chain (SCM key, SCM achain)
 487 {
 488   if (gh_pair_p (achain))
 489     {
 490       SCM handle = scm_assoc (key, gh_car (achain));
 491       if (gh_pair_p (handle))
 492         return handle;
 493       else
 494         return ly_assoc_chain (key, gh_cdr (achain));
 495     }
 496   else
 497     return SCM_BOOL_F;
 498 }