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
  15 #include "libc-extension.hh"
  16 #include "lily-guile.hh"
  17 #include "main.hh"
  18 #include "simple-file-storage.hh"
  19 #include "file-path.hh"
  20 #include "debug.hh"
  21 #include "direction.hh"
  22 #include "offset.hh"
  23
  24 SCM
  25 ly_str02scm (char const*c)
  26 {
  27   // this all really sucks, guile should take char const* arguments!
  28   return gh_str02scm ((char*)c);
  29 }
  30
  31 SCM
  32 ly_eval_str (String s)
  33 {
  34   // this all really sucks, guile should take char const* arguments!
  35   return gh_eval_str ((char*)s.ch_C ());
  36 }
  37
  38
  39 /*
  40   Pass string to scm parser, evaluate one expression.
  41   Return result value and #chars read.
  42
  43   Thanks to Gary Houston <ghouston@freewire.co.uk>
  44
  45   Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
  46 */
  47 SCM
  48 ly_parse_scm (char const* s, int* n)
  49 {
  50   SCM str = gh_str02scm ((char*)s);
  51   SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
  52                             "scm_eval_0str");
  53   SCM from = scm_ftell (port);
  54
  55   SCM form;
  56   SCM answer = SCM_UNSPECIFIED;
  57
  58   /* Read expression from port */
  59   if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
  60     answer = scm_eval_x (form);
  61
  62   /*
  63    After parsing
  64
  65        (begin (foo 1 2))
  66
  67    all seems fine, but after parsing
  68
  69        (foo 1 2)
  70
  71    read_buf has been advanced to read_pos - 1,
  72    so that scm_ftell returns 1, instead of #parsed chars
  73    */
  74
  75   /*
  76     urg: reset read_buf for scm_ftell
  77     shouldn't scm_read () do this for us?
  78   */
  79   scm_fill_input (port);
  80   SCM to = scm_ftell (port);
  81   *n = gh_scm2int (to) - gh_scm2int (from);
  82
  83   /* Don't close the port here; if we re-enter this function via a
  84      continuation, then the next time we enter it, we'll get an error.
  85      It's a string port anyway, so there's no advantage to closing it
  86      early.
  87
  88      scm_close_port (port);
  89   */
  90
  91   return answer;
  92 }
  93
  94 SCM
  95 ly_quote_scm (SCM s)
  96 {
  97   return gh_list (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
  98 }
  99
 100
 101 SCM
 102 ly_symbol2scm(const char *s)
 103 {
 104   return gh_symbol2scm ((char *)s);
 105 }
 106
 107 String
 108 ly_symbol2string (SCM s)
 109 {
 110   assert (gh_symbol_p (s));
 111   return String((Byte*)SCM_CHARS (s), (int) SCM_LENGTH(s));
 112 }
 113
 114
 115 /**
 116    Read a file, and shove it down GUILE.  GUILE also has file read
 117    functions, but you can't fiddle with the path of those.
 118  */
 119 void
 120 read_lily_scm_file (String fn)
 121 {
 122   String s = global_path.find (fn);
 123   if (s == "")
 124     {
 125       String e = _f ("Can't find file: `%s'", fn);
 126       e += " ";
 127       e += _f ("(load path: `%s')", global_path.str ());
 128       error (e);
 129     }
 130   else
 131     progress_indication ("[" + s);
 132
 133
 134   Simple_file_storage f(s);
 135
 136   ly_eval_str ((char *) f.ch_C());
 137   progress_indication ("]");
 138 }
 139
 140
 141 SCM
 142 ly_gulp_file (SCM name)
 143 {
 144   String fn (ly_scm2string (name));
 145  String s = global_path.find (fn);
 146   if (s == "")
 147     {
 148       String e = _f ("Can't find file: `%s'", fn);
 149       e += " ";
 150       e += _f ("(load path: `%s')", global_path.str ());
 151       error (e);
 152     }
 153   else
 154     progress_indication ("[" + s );
 155
 156
 157   Simple_file_storage f(s);
 158   SCM result = ly_str02scm (f.ch_C());
 159   progress_indication ("]");
 160   return result;
 161 }
 162
 163 void
 164 ly_display_scm (SCM s)
 165 {
 166   gh_display (s);
 167   gh_newline ();
 168 }
 169
 170 String
 171 ly_scm2string (SCM s)
 172 {
 173   assert (gh_string_p (s));
 174   int len;
 175   char * p = gh_scm2newstr (s , &len);
 176
 177   String r (p);
 178
 179   free (p);
 180   return r;
 181 }
 182
 183 SCM
 184 index_cell (SCM s, Direction d)
 185 {
 186   assert (d);
 187   return (d == LEFT) ? gh_car  (s) : gh_cdr (s);
 188 }
 189
 190 SCM
 191 index_set_cell (SCM s, Direction d, SCM v)
 192 {
 193   if (d == LEFT)
 194     gh_set_car_x (s, v);
 195   else if (d == RIGHT)
 196     gh_set_cdr_x (s, v);
 197   return s;
 198 }
 199
 200 SCM
 201 ly_warning (SCM str)
 202 {
 203   assert (gh_string_p (str));
 204   warning ("lily-guile: " + ly_scm2string (str));
 205   return SCM_BOOL_T;
 206 }
 207
 208 SCM
 209 ly_isdir_p (SCM s)
 210 {
 211   if (gh_number_p (s))
 212     {
 213       int i = gh_scm2int (s);
 214       return (i>= -1 && i <= 1)  ? SCM_BOOL_T : SCM_BOOL_F;
 215     }
 216   return SCM_BOOL_F;
 217 }
 218
 219
 220 static void
 221 init_functions ()
 222 {
 223   scm_make_gsubr ("ly-warn", 1, 0, 0, (SCM(*)(...))ly_warning);
 224   scm_make_gsubr ("ly-gulp-file", 1,0, 0, (SCM(*)(...))ly_gulp_file);
 225   scm_make_gsubr ("dir?", 1,0, 0, (SCM(*)(...))ly_isdir_p);
 226 }
 227
 228 ADD_SCM_INIT_FUNC(funcs, init_functions);
 229
 230
 231 typedef void (*Void_fptr)();
 232 Array<Void_fptr> *scm_init_funcs_;
 233
 234 void add_scm_init_func (void (*f)())
 235 {
 236   if (!scm_init_funcs_)
 237     scm_init_funcs_ = new Array<Void_fptr>;
 238
 239   scm_init_funcs_->push (f);
 240 }
 241
 242 void
 243 init_lily_guile ()
 244 {
 245   for (int i=scm_init_funcs_->size() ; i--;)
 246     (scm_init_funcs_->elem (i)) ();
 247 }
 248
 249 unsigned int ly_scm_hash (SCM s)
 250 {
 251   return scm_ihashv (s, ~1u);
 252 }
 253
 254
 255
 256 bool
 257 isdir_b (SCM s)
 258 {
 259   if (gh_number_p (s))
 260     {
 261       int i = gh_scm2int (s);
 262       return i>= -1 && i <= 1;
 263     }
 264   return false;
 265 }
 266
 267 Direction
 268 to_dir (SCM s)
 269 {
 270   return (Direction) gh_scm2int (s);
 271 }
 272
 273
 274 SCM
 275 to_scm (int i)
 276 {
 277   return gh_int2scm (i);
 278 }
 279
 280 /*
 281   UGR. junkme.
 282  */
 283 int
 284 scm_to (SCM s, int* )
 285 {
 286   return gh_number_p (s) ? gh_scm2int (s) : 0;
 287 }
 288
 289 SCM
 290 to_scm (Real r)
 291 {
 292   return gh_double2scm (r);
 293 }
 294
 295 Real
 296 scm_to (SCM s, Real* )
 297 {
 298   return gh_number_p (s) ? gh_scm2double (s) : 0;
 299 }
 300
 301 bool
 302 to_boolean (SCM s)
 303 {
 304   return gh_boolean_p (s) && gh_scm2bool (s);
 305 }
 306
 307 /*
 308   Appendable list L: the cdr contains the list, the car the last cons
 309   in the list.
 310  */
 311 SCM
 312 appendable_list ()
 313 {
 314   SCM s = gh_cons (SCM_EOL, SCM_EOL);
 315   gh_set_car_x (s, s);
 316
 317   return s;
 318 }
 319
 320 void
 321 appendable_list_append (SCM l, SCM elt)
 322 {
 323   SCM newcons = gh_cons (elt, SCM_EOL);
 324
 325   gh_set_cdr_x (gh_car (l), newcons);
 326   gh_set_car_x (l, newcons);
 327 }
 328
 329
 330 SCM
 331 to_scm (Offset o)
 332 {
 333   return gh_cons (gh_double2scm (o[X_AXIS]), gh_double2scm(o[Y_AXIS]));
 334 }
 335
 336 Offset
 337 scm_to (SCM s, Offset*)
 338 {
 339   return Offset (gh_scm2double (gh_car (s)),
 340                  gh_scm2double (gh_cdr (s)));
 341 }
 342
 343 SCM
 344 ly_type (SCM exp)
 345 {
 346   char const  * cp = "unknown";
 347   if (gh_number_p (exp))
 348     {
 349       cp = "number";
 350     }
 351   else if (gh_string_p (exp))
 352     {
 353       cp = "string";
 354     }
 355   else if (gh_procedure_p (exp))
 356     {
 357       cp = "procedure";
 358     }
 359   else if (gh_boolean_p (exp))
 360     {
 361       cp = "boolean";
 362     }
 363   else if (gh_pair_p (exp))
 364     {
 365       cp = "list";
 366     }
 367
 368   return ly_str02scm (cp);
 369 }