2 volta-engraver.cc -- implement Volta_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "engraver.hh"
11 #include "translator-group.hh"
12 #include "volta-bracket.hh"
14 #include "note-column.hh"
15 #include "bar-line.hh"
16 #include "side-position-interface.hh"
18 #include "staff-symbol.hh"
21 Create Volta spanners, by reading repeatCommands property, usually
22 set by Unfolded_repeat_iterator.
24 class Volta_engraver : public Engraver
27 TRANSLATOR_DECLARATIONS(Volta_engraver);
30 virtual void acknowledge_grob (Grob_info);
31 virtual void finalize ();
32 virtual void stop_translation_timestep ();
33 virtual void process_music ();
34 virtual void process_acknowledged_grobs ();
38 Spanner *end_volta_span_;
43 Volta_engraver::Volta_engraver ()
52 Volta_engraver::process_music ()
54 if (unsmob_grob (staff_))
57 TODO: this does weird things when you open a piece with a
61 SCM staffs = get_property ("stavesFound");
64 only put a volta on the top staff.
66 May be this is a bit convoluted, and we should have a single
67 volta engraver in score context or somesuch.
70 if (!gh_pair_p (staffs))
71 programming_error ("Huh? Volta engraver can't find staffs?");
72 else if (ly_car (scm_last_pair (staffs)) != staff_)
77 SCM cs = get_property ("repeatCommands");
80 start_string_ = SCM_EOL;
81 while (gh_pair_p (cs))
85 if (gh_pair_p (c) && ly_car (c) == ly_symbol2scm ("volta")
86 && gh_pair_p (ly_cdr (c)))
88 if (ly_cadr (c) == SCM_BOOL_F)
91 start_string_ = ly_cadr (c);
99 SCM l (get_property ("voltaSpannerDuration"));
100 Moment now = now_mom ();
102 bool early_stop = unsmob_moment (l)
103 && *unsmob_moment (l) <= now - started_mom_;
105 end = end || early_stop;
109 if (end && !volta_span_)
111 warning (_ ("No volta spanner to end")); // fixme: be more verbose.
115 end_volta_span_ = volta_span_;
119 if (gh_string_p (start_string_) && volta_span_)
121 warning (_ ("Already have a volta spanner. Stopping that one prematurely."));
125 warning (_ ("Also have a stopped spanner. Giving up."));
129 end_volta_span_ = volta_span_;
135 this could just as well be done in process_music (), but what the hack.
138 Volta_engraver::process_acknowledged_grobs ()
140 if (!volta_span_ && gh_string_p (start_string_))
142 started_mom_ = now_mom () ;
144 volta_span_ = new Spanner (get_property ("VoltaBracket"));
146 announce_grob (volta_span_, SCM_EOL);
147 volta_span_->set_grob_property ("text", start_string_);
152 Volta_engraver::acknowledge_grob (Grob_info i)
154 if (Item* item = dynamic_cast<Item*> (i.grob_))
156 if (Note_column::has_interface (item))
159 Volta_bracket_interface::add_column (volta_span_,item);
161 if (Bar_line::has_interface (item))
164 Volta_bracket_interface::add_bar (volta_span_, item);
166 Volta_bracket_interface::add_bar (end_volta_span_ , item);
169 else if (Staff_symbol::has_interface (i.grob_))
172 We only want to know about a single staff: then we add to the
174 if (staff_ != SCM_EOL)
175 staff_ = SCM_UNDEFINED;
177 if (staff_ != SCM_UNDEFINED)
178 staff_ = i.grob_->self_scm();
183 Volta_engraver::finalize ()
187 typeset_grob (volta_span_);
191 typeset_grob (end_volta_span_);
198 Volta_engraver::stop_translation_timestep ()
202 typeset_grob (end_volta_span_);
208 TODO: should attach volta to paper-column if no bar is found.
211 ENTER_DESCRIPTION(Volta_engraver,
212 /* descr */ "Make volta brackets",
213 /* creats*/ "VoltaBracket",
214 /* acks */ "bar-line-interface staff-symbol-interface note-column-interface",
215 /* reads */ "repeatCommands voltaSpannerDuration stavesFound",