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--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "grob-interface.hh"
  10
  11 #include "grob.hh"
  12 #include "international.hh"
  13 #include "protected-scm.hh"
  14 #include "string-convert.hh"
  15 #include "warn.hh"
  16 #include "misc.hh"
  17
  18 SCM add_interface (char const *cxx_name,
  19                     char const *descr,
  20                     char const *vars)
  21 {
  22   string suffix ("-interface");
  23   string lispy_name = camel_case_to_lisp_identifier (cxx_name);
  24   vsize end = max (int (0), int (lispy_name.length () - suffix.length ()));
  25   if (lispy_name.substr (end) != suffix)
  26     lispy_name += suffix;
  27
  28   SCM s = ly_symbol2scm (lispy_name.c_str ());
  29   SCM d = scm_from_locale_string (descr);
  30   SCM l = parse_symbol_list (vars);
  31
  32   internal_add_interface (s, d, l);
  33
  34   return s;
  35 }
  36
  37 void
  38 check_interfaces_for_property (Grob const *me, SCM sym)
  39 {
  40   if (sym == ly_symbol2scm ("meta"))
  41     {
  42       /*
  43         otherwise we get in a nasty recursion loop.
  44       */
  45       return;
  46     }
  47
  48   SCM ifs = me->interfaces ();
  49
  50   SCM all_ifaces = ly_all_grob_interfaces ();
  51   bool found = false;
  52   for (; !found && scm_is_pair (ifs); ifs = scm_cdr (ifs))
  53     {
  54       SCM iface = scm_hashq_ref (all_ifaces, scm_car (ifs), SCM_BOOL_F);
  55       if (iface == SCM_BOOL_F)
  56         {
  57           string msg = to_string (_f ("Unknown interface `%s'",
  58                                       ly_symbol2string (scm_car (ifs)).c_str ()));
  59           programming_error (msg);
  60           continue;
  61         }
  62
  63       found = found || (scm_c_memq (sym, scm_caddr (iface)) != SCM_BOOL_F);
  64     }
  65
  66   if (!found)
  67     {
  68       string str = to_string (_f ("Grob `%s' has no interface for property `%s'",
  69                                   me->name ().c_str (),
  70                                   ly_symbol2string (sym).c_str ()));
  71       programming_error (str);
  72     }
  73 }