2 recording-group-engraver.cc -- implement Recording_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2003--2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
11 #include "engraver-group-engraver.hh"
12 #include "protected-scm.hh"
14 class Recording_group_engraver : public Engraver_group_engraver
18 TRANSLATOR_DECLARATIONS (Recording_group_engraver);
19 virtual bool try_music (Music *m);
20 virtual void start_translation_timestep ();
21 virtual void stop_translation_timestep ();
22 virtual void finalize ();
23 virtual void initialize ();
24 virtual void derived_mark () const;
29 Recording_group_engraver::derived_mark () const
31 Engraver_group_engraver::derived_mark();
32 scm_gc_mark (accumulator_);
36 Recording_group_engraver::initialize ()
38 Engraver_group_engraver::initialize ();
42 Recording_group_engraver::Recording_group_engraver ()
44 accumulator_ = SCM_EOL;
48 Recording_group_engraver::start_translation_timestep ()
50 Engraver_group_engraver::start_translation_timestep ();
54 We have to do this both in initialize () and
55 start_translation_timestep (), since start_translation_timestep ()
56 isn't called on the first time-step.
62 Recording_group_engraver::start ()
64 if (!scm_is_pair (accumulator_))
65 accumulator_ = scm_cons (SCM_EOL, SCM_EOL);
66 if (!scm_is_pair (scm_car (accumulator_)))
69 Need to store transposition for every moment; transposition changes during pieces.
71 scm_set_car_x (accumulator_, scm_cons (scm_cons (now_mom ().smobbed_copy (),
72 get_property ("instrumentTransposition")),
78 Recording_group_engraver::stop_translation_timestep ()
80 Engraver_group_engraver::stop_translation_timestep ();
81 scm_set_cdr_x (accumulator_, scm_cons (scm_car (accumulator_), scm_cdr (accumulator_)));
83 scm_set_car_x (accumulator_, SCM_EOL);
87 Recording_group_engraver::finalize ()
89 Engraver_group_engraver::finalize ();
90 SCM proc = get_property ("recordEventSequence");
92 if (ly_c_procedure_p (proc))
93 scm_call_2 (proc, context ()->self_scm (), scm_cdr (accumulator_));
95 accumulator_ = SCM_EOL;
99 Recording_group_engraver::try_music (Music *m)
101 bool retval = Translator_group::try_music (m);
103 SCM seq = scm_cdar (accumulator_);
104 seq = scm_cons (scm_cons (m->self_scm (), ly_bool2scm (retval)),
107 scm_set_cdr_x (scm_car (accumulator_), seq);
113 ENTER_DESCRIPTION (Recording_group_engraver,
114 "Engraver_group_engraver that records all music events "
115 "for this context. Calls the procedure "
116 "in @code{recordEventSequence} when finished.",
120 "recordEventSequence",