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--2003 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_string () + ">";
  27   scm_puts (str.to_str0 (), 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 /*
  39   We don't use IMPLEMENT_TYPE_P, since the smobification part is
  40   implemented separately from the class.
  41  */
  42 LY_DEFINE(ly_input, "ly:input-location?", 1, 0, 0,
  43           (SCM x),
  44           "Return whether @var{x} is an input location")
  45 {
  46   return unsmob_input (x) ? SCM_BOOL_T : SCM_BOOL_F ;
  47 }
  48
  49 LY_DEFINE(ly_input_message,  "ly:input-message", 2, 0, 0, (SCM sip, SCM msg),
  50           "Print @var{msg} as a GNU compliant error message, pointing to the\n"
  51           "location in @var{sip}.\n"
  52           )
  53 {
  54   Input *ip  = unsmob_input(sip);
  55
  56   SCM_ASSERT_TYPE(ip, sip, SCM_ARG1, __FUNCTION__, "input location");
  57   SCM_ASSERT_TYPE(gh_string_p (msg), msg, SCM_ARG2, __FUNCTION__, "string");
  58
  59   String m = ly_scm2string (msg);
  60
  61   ip->message (m);
  62   return SCM_UNDEFINED;
  63 }
  64
  65
  66 static void
  67 start_input_smobs ()
  68 {
  69   input_tag = scm_make_smob_type ("input", 0);
  70   scm_set_smob_mark (input_tag, mark_smob);
  71   scm_set_smob_free (input_tag, free_smob);
  72   scm_set_smob_print (input_tag, print_smob);
  73   scm_set_smob_equalp (input_tag, 0);
  74 }
  75
  76 SCM
  77 make_input (Input ip)
  78 {
  79   Input * nip =  new Input (ip);
  80   SCM z;
  81
  82   SCM_NEWSMOB (z, input_tag, nip);
  83   return z;
  84 }
  85
  86 Input *
  87 unsmob_input (SCM s)
  88 {
  89   if (SCM_IMP (s))
  90     return 0;
  91   if (SCM_CAR (s) == (SCM)input_tag) // ugh.
  92     return (Input*) SCM_CDR (s);
  93   else
  94     return 0;
  95 }
  96
  97
  98 ADD_SCM_INIT_FUNC (input, start_input_smobs);
  99
 100
 101 Input dummy_input_global;
 102