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--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "input.hh"
  10 #include "source-file.hh"
  11 #include "std-string.hh"
  12
  13 #include "ly-smobs.icc"
  14
  15 /* Dummy input location for use if real one is missing.  */
  16 Input dummy_input_global;
  17
  18 static long input_tag;
  19
  20 static SCM
  21 mark_smob (SCM s)
  22 {
  23   Input *sc = (Input *) SCM_CELL_WORD_1 (s);
  24
  25   if (Source_file *sf = sc->get_source_file ())
  26     return sf->self_scm ();
  27
  28   return SCM_EOL;
  29 }
  30
  31 static int
  32 print_smob (SCM s, SCM port, scm_print_state *)
  33 {
  34   string str = "#<location " + unsmob_input (s)->location_string () + ">";
  35   scm_puts (str.c_str (), port);
  36   return 1;
  37 }
  38
  39 static size_t
  40 free_smob (SCM s)
  41 {
  42   delete unsmob_input (s);
  43   return 0;
  44 }
  45
  46 static SCM
  47 equal_smob (SCM sa, SCM sb)
  48 {
  49   Input *a = (Input *) SCM_CELL_WORD_1 (sa);
  50   Input *b = (Input *) SCM_CELL_WORD_1 (sb);
  51   if (a->get_source_file () == b->get_source_file () &&
  52       a->start () == b->start () &&
  53       a->end () == b->end ())
  54     return SCM_BOOL_T;
  55   else
  56     return SCM_BOOL_F;
  57 }
  58
  59 static void
  60 start_input_smobs ()
  61 {
  62   input_tag = scm_make_smob_type ("input", 0);
  63   scm_set_smob_mark (input_tag, mark_smob);
  64   scm_set_smob_free (input_tag, free_smob);
  65   scm_set_smob_print (input_tag, print_smob);
  66   scm_set_smob_equalp (input_tag, equal_smob);
  67 }
  68
  69 SCM
  70 make_input (Input ip)
  71 {
  72   Input *nip = new Input (ip);
  73   SCM z;
  74
  75   SCM_NEWSMOB (z, input_tag, nip);
  76   return z;
  77 }
  78
  79 Input *
  80 unsmob_input (SCM s)
  81 {
  82   if (SCM_IMP (s))
  83     return 0;
  84   if (SCM_CAR (s) == (SCM)input_tag) // ugh.
  85     return (Input *) SCM_CDR (s);
  86   else
  87     return 0;
  88 }
  89
  90 ADD_SCM_INIT_FUNC (input, start_input_smobs);
  91