2 key-engraver.cc -- implement Key_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
12 #include "engraver.hh"
15 #include "protected-scm.hh"
16 #include "staff-symbol-referencer.hh"
17 #include "stream-event.hh"
19 #include "translator.icc"
21 class Key_engraver : public Engraver
23 void create_key (bool);
24 void read_event (Stream_event const *r);
26 Stream_event *key_event_;
30 TRANSLATOR_DECLARATIONS (Key_engraver);
33 virtual void initialize ();
34 virtual void finalize ();
35 void stop_translation_timestep ();
36 void process_music ();
38 DECLARE_TRANSLATOR_LISTENER (key_change);
39 DECLARE_ACKNOWLEDGER (clef);
40 DECLARE_ACKNOWLEDGER (bar_line);
44 Key_engraver::finalize ()
48 Key_engraver::Key_engraver ()
57 Key_engraver::create_key (bool is_default)
61 item_ = make_item ("KeySignature",
62 key_event_ ? key_event_->self_scm () : SCM_EOL);
64 item_->set_property ("c0-position",
65 get_property ("middleCPosition"));
67 SCM last = get_property ("lastKeySignature");
68 SCM key = get_property ("keySignature");
69 bool extranatural = to_boolean (get_property ("extraNatural"));
71 if ((to_boolean (get_property ("printKeyCancellation"))
73 && !scm_is_eq (last, key))
75 SCM restore = SCM_EOL;
77 for (SCM s = last; scm_is_pair (s); s = scm_cdr (s))
79 SCM new_alter_pair = scm_assoc (scm_caar (s), key);
80 Rational old_alter = robust_scm2rational (scm_cdar (s), 0);
81 if (new_alter_pair == SCM_BOOL_F
83 && (ly_scm2rational (scm_cdr (new_alter_pair)) - old_alter)*old_alter < Rational (0))
85 *tail = scm_cons (scm_car (s), *tail);
86 tail = SCM_CDRLOC (*tail);
90 if (scm_is_pair (restore))
92 cancellation_ = make_item ("KeyCancellation",
94 ? key_event_->self_scm () : SCM_EOL);
96 cancellation_->set_property ("alteration-alist", restore);
97 cancellation_->set_property ("c0-position",
98 get_property ("middleCPosition"));
102 item_->set_property ("alteration-alist", key);
107 SCM visibility = get_property ("explicitKeySignatureVisibility");
108 item_->set_property ("break-visibility", visibility);
112 IMPLEMENT_TRANSLATOR_LISTENER (Key_engraver, key_change);
114 Key_engraver::listen_key_change (Stream_event *ev)
116 /* do this only once, just to be on the safe side. */
117 if (ASSIGN_EVENT_ONCE (key_event_, ev))
118 read_event (key_event_);
122 Key_engraver::acknowledge_clef (Grob_info /* info */)
124 SCM c = get_property ("createKeyOnClefChange");
130 Key_engraver::acknowledge_bar_line (Grob_info /* info */)
132 if (scm_is_pair (get_property ("keySignature")))
137 Key_engraver::process_music ()
140 || get_property ("lastKeySignature") != get_property ("keySignature"))
145 Key_engraver::stop_translation_timestep ()
148 context ()->set_property ("lastKeySignature", get_property ("keySignature"));
154 Key_engraver::read_event (Stream_event const *r)
156 SCM p = r->get_property ("pitch-alist");
157 if (!scm_is_pair (p))
162 SCM alist = scm_list_copy (p);
163 SCM order = get_property ("keyAlterationOrder");
165 scm_is_pair (s) && scm_is_pair (alist); s = scm_cdr (s))
167 SCM head = scm_member (scm_car (s), alist);
169 if (scm_is_pair (head))
171 accs = scm_cons (scm_car (head), accs);
172 alist = scm_delete_x (scm_car (head), alist);
176 if (scm_is_pair (alist))
179 for (SCM s = alist; scm_is_pair (s); s = scm_cdr (s))
180 if (ly_scm2rational (scm_cdar (s)))
183 accs = scm_cons (scm_car (s), accs);
187 r->origin ()->warning ("No ordering for key signature alterations");
190 context ()->set_property ("keySignature", accs);
191 context ()->set_property ("tonic",
192 r->get_property ("tonic"));
196 Key_engraver::initialize ()
198 context ()->set_property ("keySignature", SCM_EOL);
199 context ()->set_property ("lastKeySignature", SCM_EOL);
202 context ()->set_property ("tonic", p.smobbed_copy ());
205 ADD_ACKNOWLEDGER (Key_engraver, clef);
206 ADD_ACKNOWLEDGER (Key_engraver, bar_line);
208 ADD_TRANSLATOR (Key_engraver,
210 "Engrave a key signature.",
216 "createKeyOnClefChange "
217 "explicitKeySignatureVisibility "
219 "keyAlterationOrder "
222 "printKeyCancellation ",