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
 232
 233 typedef void (*Void_fptr) ();
 234 Array<Void_fptr> *scm_init_funcs_;
 235
 236 void add_scm_init_func (void (*f) ())
 237 {
 238   if (!scm_init_funcs_)
 239     scm_init_funcs_ = new Array<Void_fptr>;
 240
 241   scm_init_funcs_->push (f);
 242 }
 243 extern  void init_cxx_function_smobs ();
 244
 245 void
 246 init_lily_guile ()
 247 {
 248   init_cxx_function_smobs ();
 249   for (int i=scm_init_funcs_->size () ; i--;)
 250  (scm_init_funcs_->elem (i)) ();
 251 }
 252
 253 unsigned int ly_scm_hash (SCM s)
 254 {
 255   return scm_ihashv (s, ~1u);
 256 }
 257
 258
 259
 260 bool
 261 isdir_b (SCM s)
 262 {
 263   if (gh_number_p (s))
 264     {
 265       int i = gh_scm2int (s);
 266       return i>= -1 && i <= 1;
 267     }
 268   return false;
 269 }
 270
 271 Direction
 272 to_dir (SCM s)
 273 {
 274   return (Direction) gh_scm2int (s);
 275 }
 276
 277 Interval
 278 ly_scm2interval (SCM p)
 279 {
 280   return  Interval (gh_scm2double (gh_car (p)),
 281                     gh_scm2double (gh_cdr (p)));
 282 }
 283
 284 SCM
 285 ly_interval2scm (Interval i)
 286 {
 287   return gh_cons (gh_double2scm (i[LEFT]),
 288                   gh_double2scm (i[RIGHT]));
 289 }
 290
 291
 292
 293
 294 bool
 295 to_boolean (SCM s)
 296 {
 297   return gh_boolean_p (s) && gh_scm2bool (s);
 298 }
 299
 300 /*
 301   Appendable list L: the cdr contains the list, the car the last cons
 302   in the list.
 303  */
 304 SCM
 305 appendable_list ()
 306 {
 307   SCM s = gh_cons (SCM_EOL, SCM_EOL);
 308   gh_set_car_x (s, s);
 309
 310   return s;
 311 }
 312
 313 void
 314 appendable_list_append (SCM l, SCM elt)
 315 {
 316   SCM newcons = gh_cons (elt, SCM_EOL);
 317
 318   gh_set_cdr_x (gh_car (l), newcons);
 319   gh_set_car_x (l, newcons);
 320 }
 321
 322
 323 SCM
 324 ly_offset2scm (Offset o)
 325 {
 326   return gh_cons (gh_double2scm (o[X_AXIS]), gh_double2scm (o[Y_AXIS]));
 327 }
 328
 329 Offset
 330 ly_scm2offset (SCM s)
 331 {
 332   return Offset (gh_scm2double (gh_car (s)),
 333                  gh_scm2double (gh_cdr (s)));
 334 }
 335
 336 SCM
 337 ly_type (SCM exp)
 338 {
 339   char const  * cp = "unknown";
 340   if (gh_number_p (exp))
 341     {
 342       cp = "number";
 343     }
 344   else if (gh_string_p (exp))
 345     {
 346       cp = "string";
 347     }
 348   else if (gh_procedure_p (exp))
 349     {
 350       cp = "procedure";
 351     }
 352   else if (gh_boolean_p (exp))
 353     {
 354       cp = "boolean";
 355     }
 356   else if (gh_pair_p (exp))
 357     {
 358       cp = "list";
 359     }
 360
 361   return ly_str02scm (cp);
 362 }
 363
 364 /*
 365   convert without too many decimals, and leave  a space at the end.
 366  */
 367
 368
 369 SCM
 370 ly_number2string (SCM s)
 371 {
 372   assert (gh_number_p (s));
 373
 374   char str[400];                        // ugh.
 375
 376   if (scm_integer_p (s) == SCM_BOOL_F)
 377     {
 378       Real r (gh_scm2double (s));
 379
 380       if (isinf (r) || isnan (r))
 381         {
 382           programming_error ("Infinity or NaN encountered while converting Real number; setting to zero.");
 383           r = 0.0;
 384         }
 385
 386       sprintf (str, "%8.4f ", r);
 387     }
 388   else
 389     {
 390       sprintf (str, "%d ", gh_scm2int (s));
 391     }
 392
 393   return ly_str02scm (str);
 394 }
 395
 396 /*
 397   Undef this to see if GUILE GC is causing too many swaps.
 398  */
 399
 400 // #define TEST_GC
 401
 402 #ifdef TEST_GC
 403 #include <libguile/gc.h>
 404
 405 static void *
 406 greet_sweep (void *dummy1, void *dummy2, void *dummy3)
 407 {
 408    fprintf (stderr, "entering sweep\n");
 409 }
 410
 411 static void *
 412 wave_sweep_goodbye (void *dummy1, void *dummy2, void *dummy3)
 413 {
 414    fprintf (stderr, "leaving sweep\n");
 415 }
 416 #endif
 417
 418
 419 #include "version.hh"
 420 SCM
 421 ly_version ()
 422 {
 423   char const* vs =  "\' (" MAJOR_VERSION " " MINOR_VERSION " "  PATCH_LEVEL " " MY_PATCH_LEVEL ")" ;
 424
 425
 426   return gh_eval_str ((char*)vs);
 427 }
 428
 429 static void
 430 init_functions ()
 431 {
 432   scm_make_gsubr ("ly-warn", 1, 0, 0, (Scheme_function_unknown)ly_warning);
 433   scm_make_gsubr ("ly-version", 0, 0, 0, (Scheme_function_unknown)ly_version);
 434   scm_make_gsubr ("ly-gulp-file", 1,0, 0, (Scheme_function_unknown)ly_gulp_file);
 435   scm_make_gsubr ("dir?", 1,0, 0, (Scheme_function_unknown)ly_isdir_p);
 436
 437   scm_make_gsubr ("ly-number->string", 1, 0,0, (Scheme_function_unknown) ly_number2string);
 438
 439
 440 #ifdef TEST_GC
 441   scm_c_hook_add (&scm_before_mark_c_hook, greet_sweep, 0, 0);
 442   scm_c_hook_add (&scm_before_sweep_c_hook, wave_sweep_goodbye, 0, 0);
 443 #endif
 444 }
 445
 446 ADD_SCM_INIT_FUNC (funcs, init_functions);
 447
 448 SCM
 449 ly_deep_copy (SCM l)
 450 {
 451   if (gh_pair_p (l))
 452     {
 453       return gh_cons (ly_deep_copy (gh_car (l)), ly_deep_copy (gh_cdr (l)));
 454     }
 455   else
 456     return l;
 457 }
 458
 459
 460
 461
 462 SCM
 463 ly_assoc_chain (SCM key, SCM achain)
 464 {
 465   if (gh_pair_p (achain))
 466     {
 467       SCM handle = scm_assoc (key, gh_car (achain));
 468       if (gh_pair_p (handle))
 469         return handle;
 470       else
 471         return ly_assoc_chain (key, gh_cdr (achain));
 472     }
 473   else
 474     return SCM_BOOL_F;
 475 }