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--1999 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
  23 SCM
  24 ly_str02scm (char const*c)
  25 {
  26   // this all really sucks, guile should take char const* arguments!
  27   return gh_str02scm ((char*)c);
  28 }
  29
  30 SCM
  31 ly_eval_str (String s)
  32 {
  33   // this all really sucks, guile should take char const* arguments!
  34   return gh_eval_str ((char*)s.ch_C ());
  35 }
  36
  37
  38 /*
  39   Pass string to scm parser, evaluate one expression.
  40   Return result value and #chars read.
  41
  42   Thanks to Gary Houston <ghouston@freewire.co.uk>
  43
  44   Need guile-1.3.4 (>1.3 anyway) for ftell on str ports -- jcn
  45 */
  46 SCM
  47 ly_parse_scm (char const* s, int* n)
  48 {
  49   SCM str = gh_str02scm ((char*)s);
  50   SCM port = scm_mkstrport (SCM_INUM0, str, SCM_OPN | SCM_RDNG,
  51                             "scm_eval_0str");
  52   SCM from = scm_ftell (port);
  53
  54   SCM form;
  55   SCM answer = SCM_UNSPECIFIED;
  56
  57   /* Read expression from port */
  58   if (!SCM_EOF_OBJECT_P (form = scm_read (port)))
  59     answer = scm_eval_x (form);
  60
  61   /*
  62    After parsing
  63
  64        (begin (foo 1 2))
  65
  66    all seems fine, but after parsing
  67
  68        (foo 1 2)
  69
  70    read_buf has been advanced to read_pos - 1,
  71    so that scm_ftell returns 1, instead of #parsed chars
  72    */
  73
  74   /*
  75     urg: reset read_buf for scm_ftell
  76     shouldn't scm_read () do this for us?
  77   */
  78   scm_fill_input (port);
  79   SCM to = scm_ftell (port);
  80   *n = gh_scm2int (to) - gh_scm2int (from);
  81
  82   /* Don't close the port here; if we re-enter this function via a
  83      continuation, then the next time we enter it, we'll get an error.
  84      It's a string port anyway, so there's no advantage to closing it
  85      early.
  86
  87      scm_close_port (port);
  88   */
  89
  90   return answer;
  91 }
  92
  93 /*
  94   scm_m_quote doesn't use any env, but needs one for a good signature in GUILE.
  95 */
  96 SCM
  97 ly_quote_scm (SCM s)
  98 {
  99   return gh_list (ly_symbol2scm ("quote"), s, SCM_UNDEFINED);
 100 }
 101
 102
 103 SCM
 104 ly_symbol2scm(const char *s)
 105 {
 106   return gh_symbol2scm ((char *)s);
 107 }
 108
 109 String
 110 ly_symbol2string (SCM s)
 111 {
 112   assert (gh_symbol_p (s));
 113   return String((Byte*)SCM_CHARS (s), (int) SCM_LENGTH(s));
 114 }
 115
 116
 117 /**
 118    Read a file, and shove it down GUILE.  GUILE also has file read
 119    functions, but you can't fiddle with the path of those.
 120  */
 121 void
 122 read_lily_scm_file (String fn)
 123 {
 124   String s = global_path.find (fn);
 125   if (s == "")
 126     {
 127       String e = _f ("Can't find file: `%s'", fn);
 128       e += " ";
 129       e += _f ("(load path: `%s')", global_path.str ());
 130       error (e);
 131     }
 132   else
 133     progress_indication ("[" + s);
 134
 135
 136   Simple_file_storage f(s);
 137
 138   ly_eval_str ((char *) f.ch_C());
 139   progress_indication ("]");
 140 }
 141
 142
 143 SCM
 144 ly_gulp_file (SCM name)
 145 {
 146   String fn (ly_scm2string (name));
 147  String s = global_path.find (fn);
 148   if (s == "")
 149     {
 150       String e = _f ("Can't find file: `%s'", fn);
 151       e += " ";
 152       e += _f ("(load path: `%s')", global_path.str ());
 153       error (e);
 154     }
 155   else
 156     progress_indication ("[" + s );
 157
 158
 159   Simple_file_storage f(s);
 160   SCM result = ly_str02scm (f.ch_C());
 161   progress_indication ("]");
 162   return result;
 163 }
 164
 165 void
 166 ly_display_scm (SCM s)
 167 {
 168   gh_display (s);
 169   gh_newline ();
 170 }
 171
 172 String
 173 ly_scm2string (SCM s)
 174 {
 175   assert (gh_string_p (s));
 176   int len;
 177   char * p = gh_scm2newstr (s , &len);
 178
 179   String r (p);
 180
 181   free (p);
 182   return r;
 183 }
 184
 185 SCM
 186 index_cell (SCM s, Direction d)
 187 {
 188   assert (d);
 189   return (d == LEFT) ? gh_car  (s) : gh_cdr (s);
 190 }
 191
 192 SCM
 193 index_set_cell (SCM s, Direction d, SCM v)
 194 {
 195   if (d == LEFT)
 196     gh_set_car_x (s, v);
 197   else if (d == RIGHT)
 198     gh_set_cdr_x (s, v);
 199   return s;
 200 }
 201
 202 SCM
 203 ly_warning (SCM str)
 204 {
 205   assert (gh_string_p (str));
 206   warning ("lily-guile: " + ly_scm2string (str));
 207   return SCM_BOOL_T;
 208 }
 209
 210 SCM
 211 ly_isdir_p (SCM s)
 212 {
 213   if (gh_number_p (s))
 214     {
 215       int i = gh_scm2int (s);
 216       return (i>= -1 && i <= 1)  ? SCM_BOOL_T : SCM_BOOL_F;
 217     }
 218   return SCM_BOOL_F;
 219 }
 220
 221
 222 void
 223 init_functions ()
 224 {
 225   scm_make_gsubr ("ly-warn", 1, 0, 0, (SCM(*)(...))ly_warning);
 226   scm_make_gsubr ("ly-gulp-file", 1,0, 0, (SCM(*)(...))ly_gulp_file);
 227   scm_make_gsubr ("dir?", 1,0, 0, (SCM(*)(...))ly_isdir_p);
 228 }
 229
 230 ADD_SCM_INIT_FUNC(funcs, init_functions);
 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
 244 void
 245 init_lily_guile ()
 246 {
 247   for (int i=scm_init_funcs_->size() ; i--;)
 248     (scm_init_funcs_->elem (i)) ();
 249 }
 250
 251 unsigned int ly_scm_hash (SCM s)
 252 {
 253   return scm_ihashv (s, ~1u);
 254 }
 255
 256
 257
 258 bool
 259 isdir_b (SCM s)
 260 {
 261   if (gh_number_p (s))
 262     {
 263       int i = gh_scm2int (s);
 264       return i>= -1 && i <= 1;
 265     }
 266   return false;
 267 }
 268
 269 Direction
 270 to_dir (SCM s)
 271 {
 272   return (Direction) gh_scm2int (s);
 273 }
 274
 275
 276 SCM
 277 to_scm (int i)
 278 {
 279   return gh_int2scm (i);
 280 }
 281
 282 void
 283 scm_to (SCM s, int* i)
 284 {
 285   // urg
 286   *i = 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 void
 296 scm_to (SCM s, Real* r)
 297 {
 298   // urg
 299   *r = gh_number_p (s) ? gh_scm2double (s) : 0;
 300 }
 301
 302 bool
 303 to_boolean (SCM s)
 304 {
 305   return gh_boolean_p (s) && gh_scm2bool (s);
 306 }
 307
 308 /*
 309   Appendable list L: the cdr contains the list, the car the last cons
 310   in the list.
 311
 312  */
 313
 314 SCM
 315 appendable_list ()
 316 {
 317   SCM s = gh_cons (SCM_EOL, SCM_EOL);
 318   gh_set_car_x (s, s);
 319
 320   return s;
 321 }
 322
 323 void
 324 appendable_list_append (SCM l, SCM elt)
 325 {
 326   SCM newcons = gh_cons (elt, SCM_EOL);
 327
 328   gh_set_cdr_x (gh_car (l), newcons);
 329   gh_set_car_x (l, newcons);
 330 }