lily/grob-interface.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--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 "grob-interface.hh"
  21
  22 #include "grob.hh"
  23 #include "international.hh"
  24 #include "protected-scm.hh"
  25 #include "string-convert.hh"
  26 #include "warn.hh"
  27 #include "misc.hh"
  28
  29 SCM add_interface (char const *cxx_name,
  30                     char const *descr,
  31                     char const *vars)
  32 {
  33   string suffix ("-interface");
  34   string lispy_name = camel_case_to_lisp_identifier (cxx_name);
  35   vsize end = max (int (0), int (lispy_name.length () - suffix.length ()));
  36   if (lispy_name.substr (end) != suffix)
  37     lispy_name += suffix;
  38
  39   SCM s = ly_symbol2scm (lispy_name.c_str ());
  40   SCM d = scm_from_locale_string (descr);
  41   SCM l = parse_symbol_list (vars);
  42
  43   internal_add_interface (s, d, l);
  44
  45   return s;
  46 }
  47
  48 void
  49 check_interfaces_for_property (Grob const *me, SCM sym)
  50 {
  51   if (sym == ly_symbol2scm ("meta"))
  52     {
  53       /*
  54         otherwise we get in a nasty recursion loop.
  55       */
  56       return;
  57     }
  58
  59   SCM ifs = me->interfaces ();
  60
  61   SCM all_ifaces = ly_all_grob_interfaces ();
  62   bool found = false;
  63   for (; !found && scm_is_pair (ifs); ifs = scm_cdr (ifs))
  64     {
  65       SCM iface = scm_hashq_ref (all_ifaces, scm_car (ifs), SCM_BOOL_F);
  66       if (iface == SCM_BOOL_F)
  67         {
  68           string msg = to_string (_f ("Unknown interface `%s'",
  69                                       ly_symbol2string (scm_car (ifs)).c_str ()));
  70           programming_error (msg);
  71           continue;
  72         }
  73
  74       found = found || (scm_c_memq (sym, scm_caddr (iface)) != SCM_BOOL_F);
  75     }
  76
  77   if (!found)
  78     {
  79       string str = to_string (_f ("Grob `%s' has no interface for property `%s'",
  80                                   me->name ().c_str (),
  81                                   ly_symbol2string (sym).c_str ()));
  82       programming_error (str);
  83     }
  84 }