lily/grob-interface.cc

   1 /*
   2   grob-interface.cc -- implement graphic objects interface
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2002--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "protected-scm.hh"
  10 #include "grob-interface.hh"
  11 #include "lily-guile.hh"
  12 #include "grob.hh"
  13 #include "warn.hh"
  14
  15 Protected_scm all_ifaces;
  16
  17 void add_interface (const char * symbol,
  18                     const char * descr,
  19                     const char * vars)
  20 {
  21   SCM s = ly_symbol2scm (symbol);
  22   SCM d = scm_makfrom0str (descr);
  23   SCM l = parse_symbol_list (vars);
  24
  25   ly_add_interface (s,d,l);
  26 }
  27
  28
  29 LY_DEFINE (ly_add_interface, "ly:add-interface", 3,0,0, (SCM a, SCM b, SCM c),
  30           "Add an interface description.")
  31 {
  32   SCM_ASSERT_TYPE (ly_c_symbol_p (a), a, SCM_ARG1, __FUNCTION__, "symbol");
  33   SCM_ASSERT_TYPE (ly_c_string_p (b), b, SCM_ARG2, __FUNCTION__, "string");
  34   SCM_ASSERT_TYPE (ly_c_list_p (c), c, SCM_ARG3, __FUNCTION__, "list of syms");
  35   if (!ly_c_vector_p (all_ifaces))
  36     all_ifaces = scm_make_vector (scm_int2num (40), SCM_EOL);
  37
  38   SCM entry = scm_list_n (a, b, c, SCM_UNDEFINED);
  39
  40   scm_hashq_set_x (all_ifaces, a, entry);
  41
  42   return SCM_UNSPECIFIED;
  43 }
  44
  45
  46 LY_DEFINE (ly_all_grob_interfaces, "ly:all-grob-interfaces",
  47           0,0,0, (),
  48           "Get a hash table with all interface descriptions.")
  49 {
  50   return all_ifaces;
  51 }
  52
  53
  54 void
  55 check_interfaces_for_property (Grob const *me, SCM sym)
  56 {
  57   if (sym == ly_symbol2scm ("meta"))
  58     {
  59       /*
  60         otherwise we get in a nasty recursion loop.
  61        */
  62       return ;
  63
  64     }
  65   SCM ifs = me->get_property ("interfaces");
  66
  67   bool found = false;
  68   for (; !found && ly_c_pair_p (ifs); ifs =ly_cdr (ifs))
  69     {
  70       SCM iface = scm_hashq_ref (all_ifaces , ly_car (ifs), SCM_BOOL_F);
  71       if (iface == SCM_BOOL_F)
  72         {
  73           String msg = to_string (_f ("Unknown interface `%s'",
  74                                       ly_symbol2string (ly_car (ifs)).to_str0 ()));
  75           programming_error (msg);
  76           continue;
  77         }
  78
  79       found= found || (scm_c_memq (sym, ly_caddr (iface)) != SCM_BOOL_F);
  80     }
  81
  82   if (!found)
  83     {
  84       String str = to_string (_f ("Grob `%s' has no interface for property `%s'",
  85                                   me->name ().to_str0 (),
  86                                   ly_symbol2string (sym).to_str0 ()));
  87       programming_error (str);
  88     }
  89 }