2 property-iterator.cc -- implement Property_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "property-iterator.hh"
11 #include "context-def.hh"
12 #include "global-context.hh"
14 bool check_grob (Music *mus, SCM sym);
17 There is no real processing to a property: just lookup the
18 translation unit, and set the property.
21 Property_iterator::process (Moment m)
23 SCM sym = get_music ()->get_property ("symbol");
24 if (gh_symbol_p (sym))
26 SCM val = get_music ()->get_property ("value");
29 ok = type_check_assignment (sym, val, ly_symbol2scm ("translation-type?"));
31 get_outlet ()->internal_set_property (sym, val);
33 Simple_music_iterator::process (m);
37 Property_unset_iterator::process (Moment m)
39 SCM sym = get_music ()->get_property ("symbol");
40 type_check_assignment (sym, SCM_EOL, ly_symbol2scm ("translation-type?"));
41 get_outlet ()->unset_property (sym);
43 Simple_music_iterator::process (m);
46 MAKE_SCHEME_CALLBACK (Property_iterator,once_finalization, 2);
48 Property_iterator::once_finalization (SCM translator, SCM music )
50 Music * m = unsmob_music (music);
52 = dynamic_cast<Context *> (unsmob_context (translator));
53 SCM sym = m->get_property ("symbol");
55 tg->unset_property (sym);
56 return SCM_UNSPECIFIED;
60 Property_iterator::do_quit ()
62 if (to_boolean (get_music ()->get_property ("once")))
64 SCM trans = get_outlet ()->self_scm ();
65 SCM music = get_music ()->self_scm ();
67 Global_context * tg = get_outlet ()->get_global_context ();
68 tg->add_finalization (scm_list_n (once_finalization_proc,
69 trans, music, SCM_UNDEFINED));
77 This is a rather crude check: we merely check if the translator
81 check_grob (Music *mus, SCM sym)
85 list_p = gh_eval_str ("list?");
89 SCM type = scm_object_property (sym, ly_symbol2scm ("translation-type?"));
90 bool ok = type == list_p;
94 mus->origin ()->warning (_f ("Not a grob name, `%s'." , ly_symbol2string (sym)));
100 Push_property_iterator::process (Moment m)
102 SCM sym = get_music ()->get_property ("symbol");
103 if (check_grob (get_music (), sym))
105 SCM eprop = get_music ()->get_property ("grob-property");
106 SCM val = get_music ()->get_property ("grob-value");
108 if (to_boolean (get_music ()->get_property ("pop-first"))
109 && !to_boolean (get_music ()->get_property ("once"))
111 execute_pushpop_property (get_outlet (), sym, eprop, SCM_UNDEFINED);
113 execute_pushpop_property (get_outlet (), sym, eprop, val);
115 Simple_music_iterator::process (m);
118 MAKE_SCHEME_CALLBACK (Push_property_iterator,once_finalization, 2);
120 Push_property_iterator::once_finalization (SCM trans, SCM music)
122 Music * mus = unsmob_music (music);
123 Context * tg = dynamic_cast<Context *> (unsmob_context (trans));
125 SCM sym = mus->get_property ("symbol");
126 if (check_grob (mus, sym))
128 SCM eprop = mus->get_property ("grob-property");
130 execute_pushpop_property (tg, sym, eprop, SCM_UNDEFINED);
132 return SCM_UNSPECIFIED;
136 Push_property_iterator::do_quit ()
138 if (to_boolean (get_music ()->get_property ("once")))
140 SCM trans = get_outlet ()->self_scm ();
141 SCM music = get_music ()->self_scm ();
143 Global_context * tg= get_outlet ()->get_global_context ();
144 tg->add_finalization (scm_list_n (once_finalization_proc,
145 trans, music, SCM_UNDEFINED));
150 Pop_property_iterator::process (Moment m)
152 SCM sym = get_music ()->get_property ("symbol");
154 if (check_grob (get_music (), sym))
156 SCM eprop = get_music ()->get_property ("grob-property");
157 execute_pushpop_property (get_outlet (), sym, eprop, SCM_UNDEFINED);
159 Simple_music_iterator::process (m);
164 IMPLEMENT_CTOR_CALLBACK (Pop_property_iterator);
165 IMPLEMENT_CTOR_CALLBACK (Push_property_iterator);
166 IMPLEMENT_CTOR_CALLBACK (Property_iterator);
167 IMPLEMENT_CTOR_CALLBACK (Property_unset_iterator);