2 grob-interface.cc -- implement graphic objects interface
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "grob-interface.hh"
12 #include "international.hh"
13 #include "protected-scm.hh"
14 #include "std-string.hh"
17 void add_interface (char const *symbol,
21 SCM s = ly_symbol2scm (symbol);
22 SCM d = scm_makfrom0str (descr);
23 SCM l = parse_symbol_list (vars);
25 ly_add_interface (s, d, l);
29 check_interfaces_for_property (Grob const *me, SCM sym)
31 if (sym == ly_symbol2scm ("meta"))
34 otherwise we get in a nasty recursion loop.
39 SCM ifs = me->interfaces ();
41 SCM all_ifaces = ly_all_grob_interfaces ();
43 for (; !found && scm_is_pair (ifs); ifs = scm_cdr (ifs))
45 SCM iface = scm_hashq_ref (all_ifaces, scm_car (ifs), SCM_BOOL_F);
46 if (iface == SCM_BOOL_F)
48 string msg = to_string (_f ("Unknown interface `%s'",
49 ly_symbol2string (scm_car (ifs)).c_str ()));
50 programming_error (msg);
54 found = found || (scm_c_memq (sym, scm_caddr (iface)) != SCM_BOOL_F);
59 string str = to_string (_f ("Grob `%s' has no interface for property `%s'",
61 ly_symbol2string (sym).c_str ()));
62 programming_error (str);