/*
  input-smob.cc -- implement Input smob

  source file of the GNU LilyPond music typesetter

  (c) 2000--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/

#include "input.hh"
#include "source-file.hh"
#include "std-string.hh"

#include "ly-smobs.icc"

/* Dummy input location for use if real one is missing.  */
Input dummy_input_global;

static long input_tag;

static SCM
mark_smob (SCM s)
{
  Input *sc = (Input *) SCM_CELL_WORD_1 (s);

  if (Source_file *sf = sc->get_source_file ())
    return sf->self_scm ();

  return SCM_EOL;
}

static int
print_smob (SCM s, SCM port, scm_print_state *)
{
  string str = "#<location " + unsmob_input (s)->location_string () + ">";
  scm_puts (str.c_str (), port);
  return 1;
}

static size_t
free_smob (SCM s)
{
  delete unsmob_input (s);
  return 0;
}

static SCM
equal_smob (SCM sa, SCM sb)
{
  Input *a = (Input *) SCM_CELL_WORD_1 (sa);
  Input *b = (Input *) SCM_CELL_WORD_1 (sb);
  if (a->get_source_file () == b->get_source_file () &&
      a->start () == b->start () &&
      a->end () == b->end ())
    return SCM_BOOL_T;
  else
    return SCM_BOOL_F;
}

static void
start_input_smobs ()
{
  input_tag = scm_make_smob_type ("input", 0);
  scm_set_smob_mark (input_tag, mark_smob);
  scm_set_smob_free (input_tag, free_smob);
  scm_set_smob_print (input_tag, print_smob);
  scm_set_smob_equalp (input_tag, equal_smob);
}

SCM
make_input (Input ip)
{
  Input *nip = new Input (ip);
  SCM z;

  SCM_NEWSMOB (z, input_tag, nip);
  return z;
}

Input *
unsmob_input (SCM s)
{
  if (SCM_IMP (s))
    return 0;
  if (SCM_CAR (s) == (SCM)input_tag) // ugh.
    return (Input *) SCM_CDR (s);
  else
    return 0;
}

ADD_SCM_INIT_FUNC (input, start_input_smobs);

