lily/input-smob.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "input.hh"
  21 #include "source-file.hh"
  22 #include "std-string.hh"
  23
  24 #include "ly-smobs.icc"
  25
  26 /* Dummy input location for use if real one is missing.  */
  27 Input dummy_input_global;
  28
  29 static long input_tag;
  30
  31 static SCM
  32 mark_smob (SCM s)
  33 {
  34   Input *sc = (Input *) SCM_CELL_WORD_1 (s);
  35
  36   if (Source_file *sf = sc->get_source_file ())
  37     return sf->self_scm ();
  38
  39   return SCM_EOL;
  40 }
  41
  42 static int
  43 print_smob (SCM s, SCM port, scm_print_state *)
  44 {
  45   string str = "#<location " + unsmob_input (s)->location_string () + ">";
  46   scm_puts (str.c_str (), port);
  47   return 1;
  48 }
  49
  50 static size_t
  51 free_smob (SCM s)
  52 {
  53   delete unsmob_input (s);
  54   return 0;
  55 }
  56
  57 static SCM
  58 equal_smob (SCM sa, SCM sb)
  59 {
  60   Input *a = (Input *) SCM_CELL_WORD_1 (sa);
  61   Input *b = (Input *) SCM_CELL_WORD_1 (sb);
  62   if (a->get_source_file () == b->get_source_file () &&
  63       a->start () == b->start () &&
  64       a->end () == b->end ())
  65     return SCM_BOOL_T;
  66   else
  67     return SCM_BOOL_F;
  68 }
  69
  70 static void
  71 start_input_smobs ()
  72 {
  73   input_tag = scm_make_smob_type ("input", 0);
  74   scm_set_smob_mark (input_tag, mark_smob);
  75   scm_set_smob_free (input_tag, free_smob);
  76   scm_set_smob_print (input_tag, print_smob);
  77   scm_set_smob_equalp (input_tag, equal_smob);
  78 }
  79
  80 SCM
  81 make_input (Input ip)
  82 {
  83   Input *nip = new Input (ip);
  84   SCM z;
  85
  86   SCM_NEWSMOB (z, input_tag, nip);
  87   return z;
  88 }
  89
  90 Input *
  91 unsmob_input (SCM s)
  92 {
  93   if (SCM_IMP (s))
  94     return 0;
  95   if (SCM_CAR (s) == (SCM)input_tag) // ugh.
  96     return (Input *) SCM_CDR (s);
  97   else
  98     return 0;
  99 }
 100
 101 ADD_SCM_INIT_FUNC (input, start_input_smobs);
 102