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   return String((Byte*)SCM_CHARS (s), (int) SCM_LENGTH(s));
 113 }
 114
 115
 116 /**
 117    Read a file, and shove it down GUILE.  GUILE also has file read
 118    functions, but you can't fiddle with the path of those.
 119  */
 120 void
 121 read_lily_scm_file (String fn)
 122 {
 123   String s = global_path.find (fn);
 124   if (s == "")
 125     {
 126       String e = _f ("Can't find file: `%s'", fn);
 127       e += " ";
 128       e += _f ("(load path: `%s')", global_path.str ());
 129       error (e);
 130     }
 131   else
 132     *mlog << '[' << s;
 133
 134
 135   Simple_file_storage f(s);
 136
 137   ly_eval_str ((char *) f.ch_C());
 138   *mlog << "]" << flush;
 139 }
 140
 141
 142 SCM
 143 ly_gulp_file (SCM name)
 144 {
 145   String fn (ly_scm2string (name));
 146  String s = global_path.find (fn);
 147   if (s == "")
 148     {
 149       String e = _f ("Can't find file: `%s'", fn);
 150       e += " ";
 151       e += _f ("(load path: `%s')", global_path.str ());
 152       error (e);
 153     }
 154   else
 155     *mlog << '[' << s;
 156
 157
 158   Simple_file_storage f(s);
 159   SCM result = ly_str02scm (f.ch_C());
 160   *mlog << "]";
 161   return result;
 162 }
 163
 164 void
 165 ly_display_scm (SCM s)
 166 {
 167   gh_display (s);
 168   gh_newline ();
 169 }
 170
 171 String
 172 ly_scm2string (SCM s)
 173 {
 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 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 void
 281 scm_to (SCM s, int* i)
 282 {
 283   // urg
 284   *i = gh_number_p (s) ? gh_scm2int (s) : 0;
 285 }
 286
 287 SCM
 288 to_scm (Real r)
 289 {
 290   return gh_double2scm (r);
 291 }
 292
 293 void
 294 scm_to (SCM s, Real* r)
 295 {
 296   // urg
 297   *r = gh_number_p (s) ? gh_scm2double (s) : 0;
 298 }
 299
 300
 301 bool
 302 to_boolean (SCM s)
 303 {
 304   return gh_boolean_p (s) && gh_scm2bool (s);
 305 }