2 volta-engraver.cc -- implement Volta_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
11 #include "bar-line.hh"
13 #include "grob-array.hh"
14 #include "international.hh"
15 #include "note-column.hh"
17 #include "side-position-interface.hh"
18 #include "staff-symbol.hh"
19 #include "text-interface.hh"
20 #include "volta-bracket.hh"
23 #include "translator.icc"
26 Create Volta spanners, by reading repeatCommands property, usually
27 set by Volta_repeat_iterator.
29 class Volta_engraver : public Engraver
32 TRANSLATOR_DECLARATIONS (Volta_engraver);
35 DECLARE_ACKNOWLEDGER (bar_line);
37 virtual void derived_mark () const;
38 void stop_translation_timestep ();
39 void process_music ();
43 Spanner *end_volta_span_;
48 Volta_engraver::derived_mark () const
50 scm_gc_mark (start_string_);
53 Volta_engraver::Volta_engraver ()
55 start_string_ = SCM_EOL;
61 Volta_engraver::process_music ()
63 SCM cs = get_property ("repeatCommands");
66 start_string_ = SCM_EOL;
67 while (scm_is_pair (cs))
72 && scm_car (c) == ly_symbol2scm ("volta")
73 && scm_is_pair (scm_cdr (c)))
75 if (scm_cadr (c) == SCM_BOOL_F)
78 start_string_ = scm_cadr (c);
86 SCM l (get_property ("voltaSpannerDuration"));
87 Moment now = now_mom ();
89 bool early_stop = unsmob_moment (l)
90 && *unsmob_moment (l) <= now - started_mom_;
92 end = end || early_stop;
95 if (end && !volta_span_)
96 /* fixme: be more verbose. */
97 warning (_ ("cannot end volta spanner"));
100 end_volta_span_ = volta_span_;
105 && (scm_is_string (start_string_) || scm_is_pair (start_string_)))
107 warning (_ ("already have a volta spanner, ending that one prematurely"));
111 warning (_ ("also already have an ended spanner"));
112 warning (_ ("giving up"));
116 end_volta_span_ = volta_span_;
121 && Text_interface::is_markup (start_string_))
123 started_mom_ = now_mom ();
125 volta_span_ = make_spanner ("VoltaBracket", SCM_EOL);
127 volta_span_->set_property ("text", start_string_);
132 Volta_engraver::acknowledge_bar_line (Grob_info i)
135 Volta_bracket_interface::add_bar (volta_span_, i.item ());
137 Volta_bracket_interface::add_bar (end_volta_span_, i.item ());
141 Volta_engraver::stop_translation_timestep ()
143 if (end_volta_span_ && !end_volta_span_->get_bound (RIGHT))
145 Grob *cc = unsmob_grob (get_property ("currentCommandColumn"));
146 Item *ci = dynamic_cast<Item *> (cc);
147 end_volta_span_->set_bound (RIGHT, ci);
151 for (SCM s = get_property ("stavesFound"); scm_is_pair (s); s = scm_cdr (s))
152 Side_position_interface::add_support (end_volta_span_, unsmob_grob (scm_car (s)));
156 if (volta_span_ && !volta_span_->get_bound (LEFT))
158 Grob *cc = unsmob_grob (get_property ("currentCommandColumn"));
159 Item *ci = dynamic_cast<Item *> (cc);
160 volta_span_->set_bound (LEFT, ci);
165 TODO: should attach volta to paper-column if no bar is found.
167 ADD_ACKNOWLEDGER (Volta_engraver, bar_line);
168 ADD_TRANSLATOR (Volta_engraver,
169 /* doc */ "Make volta brackets.",
170 /* create */ "VoltaBracket",
171 /* read */ "repeatCommands voltaSpannerDuration stavesFound",