lily/input-smob.cc

   1 /*
   2   input-smob.cc --  implement Input smob
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "input.hh"
  11 #include "input-smob.hh"
  12 #include "string.hh"
  13 #include "ly-smobs.icc"
  14
  15 static long input_tag;
  16
  17 static
  18 SCM mark_smob (SCM)
  19 {
  20   return SCM_EOL;
  21 }
  22
  23 static int
  24 print_smob (SCM s, SCM port, scm_print_state *)
  25 {
  26   String str = "#<location " +  unsmob_input (s)->location_str () + ">";
  27   scm_puts (str.ch_C (), port);
  28   return 1;
  29 }
  30
  31 static size_t
  32 free_smob (SCM s)
  33 {
  34   delete unsmob_input (s);
  35   return 0;
  36 }
  37
  38 SCM
  39 ly_input_p (SCM x)
  40 {
  41   return unsmob_input (x) ? SCM_BOOL_T : SCM_BOOL_F ;
  42 }
  43
  44 static
  45 void start_input_smobs ()
  46 {
  47   input_tag = scm_make_smob_type ("input", 0);
  48   scm_set_smob_mark (input_tag, mark_smob);
  49   scm_set_smob_free (input_tag, free_smob);
  50   scm_set_smob_print (input_tag, print_smob);
  51   scm_set_smob_equalp (input_tag, 0);
  52
  53   scm_c_define_gsubr ("ly-input-location?", 1, 0, 0,
  54                       (Scheme_function_unknown)ly_input_p);
  55  }
  56
  57 SCM
  58 make_input (Input ip)
  59 {
  60   Input * nip =  new Input (ip);
  61   SCM z;
  62
  63   SCM_NEWCELL (z);
  64   SCM_SETCAR (z, (SCM)input_tag);
  65   SCM_SETCDR (z, (SCM)nip);
  66                                 // fixme: done_malloc
  67   return z;
  68 }
  69
  70 Input *
  71 unsmob_input (SCM s)
  72 {
  73   if (SCM_IMP (s))
  74     return 0;
  75   if (SCM_CAR (s) == (SCM)input_tag) // ugh.
  76     return (Input*) SCM_CDR (s);
  77   else
  78     return 0;
  79 }
  80
  81
  82 ADD_SCM_INIT_FUNC (input, start_input_smobs);
  83
  84
  85 Input dummy_input_global;
  86