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--2004 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 /* Dummy input location for use if real one is missing.  */
  16 Input dummy_input_global;
  17
  18 static long input_tag;
  19
  20 static
  21 SCM mark_smob (SCM)
  22 {
  23   return SCM_EOL;
  24 }
  25
  26 static int
  27 print_smob (SCM s, SCM port, scm_print_state *)
  28 {
  29   String str = "#<location " +  unsmob_input (s)->location_string () + ">";
  30   scm_puts (str.to_str0 (), port);
  31   return 1;
  32 }
  33
  34 static size_t
  35 free_smob (SCM s)
  36 {
  37   delete unsmob_input (s);
  38   return 0;
  39 }
  40
  41
  42 static void
  43 start_input_smobs ()
  44 {
  45   input_tag = scm_make_smob_type ("input", 0);
  46   scm_set_smob_mark (input_tag, mark_smob);
  47   scm_set_smob_free (input_tag, free_smob);
  48   scm_set_smob_print (input_tag, print_smob);
  49   scm_set_smob_equalp (input_tag, 0);
  50 }
  51
  52 SCM
  53 make_input (Input ip)
  54 {
  55   Input *nip = new Input (ip);
  56   SCM z;
  57
  58   SCM_NEWSMOB (z, input_tag, nip);
  59   return z;
  60 }
  61
  62 Input *
  63 unsmob_input (SCM s)
  64 {
  65   if (SCM_IMP (s))
  66     return 0;
  67   if (SCM_CAR (s) == (SCM)input_tag) // ugh.
  68     return (Input*) SCM_CDR (s);
  69   else
  70     return 0;
  71 }
  72
  73 /* We don't use IMPLEMENT_TYPE_P, since the smobification part is
  74    implemented separately from the class.  */
  75 LY_DEFINE (ly_input, "ly:input-location?", 1, 0, 0,
  76            (SCM x),
  77            "Return #t if @var{x} is an input location.")
  78 {
  79   return unsmob_input (x) ? SCM_BOOL_T : SCM_BOOL_F;
  80 }
  81
  82 LY_DEFINE (ly_input_message, "ly:input-message", 2, 0, 0, (SCM sip, SCM msg),
  83           "Print @var{msg} as a GNU compliant error message, pointing to the"
  84            "location in @var{sip}.\n")
  85 {
  86   Input *ip = unsmob_input (sip);
  87   SCM_ASSERT_TYPE (ip, sip, SCM_ARG1, __FUNCTION__, "input location");
  88   SCM_ASSERT_TYPE (ly_c_string_p (msg), msg, SCM_ARG2, __FUNCTION__, "string");
  89
  90   String m = ly_scm2string (msg);
  91   ip->message (m);
  92
  93   return SCM_UNSPECIFIED;
  94 }
  95
  96 /*
  97   TODO: rename this function. ly:input-location? vs ly:input-location
  98  */
  99 LY_DEFINE (ly_input_location, "ly:input-location", 1, 0, 0, (SCM sip),
 100           "Return input location in @var{sip} as (filename line column).")
 101 {
 102   Input *ip = unsmob_input (sip);
 103   SCM_ASSERT_TYPE (ip, sip, SCM_ARG1, __FUNCTION__, "input location");
 104   return scm_list_3 (scm_makfrom0str (ip->file_string ().to_str0 ()),
 105                      scm_int2num (ip->line_number ()),
 106                      scm_int2num (ip->column_number ()));
 107 }
 108
 109 ADD_SCM_INIT_FUNC (input, start_input_smobs);
 110