2 extender-engraver.cc -- implement Extender_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2005 Glen Prideaux <glenprideaux@iname.com>,
7 Han-Wen Nienhuys <hanwen@cs.uu.nl>,
8 Jan Nieuwenhuizen <janneke@gnu.org>
12 #include "engraver.hh"
13 #include "pointer-group-interface.hh"
15 #include "lyric-extender.hh"
16 #include "note-head.hh"
19 void completize_extender (Spanner *sp);
21 class Extender_engraver : public Engraver
25 Spanner *pending_extender_;
28 TRANSLATOR_DECLARATIONS (Extender_engraver);
31 DECLARE_ACKNOWLEDGER (lyric_syllable);
32 virtual void finalize ();
33 virtual bool try_music (Music *);
34 void stop_translation_timestep ();
35 void process_music ();
38 Extender_engraver::Extender_engraver ()
41 pending_extender_ = 0;
46 Extender_engraver::try_music (Music *r)
57 Extender_engraver::process_music ()
60 extender_ = make_spanner ("LyricExtender", ev_->self_scm ());
64 Extender_engraver::acknowledge_lyric_syllable (Grob_info i)
66 Item *item = i.item ();
68 extender_->set_bound (LEFT, item);
70 if (pending_extender_)
72 pending_extender_->set_object ("next", item->self_scm ());
73 completize_extender (pending_extender_);
74 pending_extender_ = 0;
79 Extender_engraver::stop_translation_timestep ()
81 if (extender_ || pending_extender_)
83 Context *voice = get_voice_to_lyrics (context ());
84 Grob *h = voice ? get_current_note_head (voice) : 0;
90 Pointer_group_interface::add_grob (extender_,
91 ly_symbol2scm ("heads"), h);
94 if (pending_extender_)
96 Pointer_group_interface::add_grob (pending_extender_,
97 ly_symbol2scm ("heads"), h);
103 pending_extender_ = extender_;
112 completize_extender (Spanner *sp)
114 if (!sp->get_bound (RIGHT))
116 extract_item_set (sp, "heads", heads);
119 sp->set_bound (RIGHT, heads.top());
125 Extender_engraver::finalize ()
129 completize_extender (extender_);
131 if (!extender_->get_bound (RIGHT))
132 extender_->warning (_ ("unterminated extender"));
136 if (pending_extender_)
138 completize_extender (pending_extender_);
140 if (!pending_extender_->get_bound (RIGHT))
141 pending_extender_->warning (_ ("unterminated extender"));
142 pending_extender_ = 0;
146 #include "translator.icc"
148 ADD_ACKNOWLEDGER (Extender_engraver,lyric_syllable);
149 ADD_TRANSLATOR (Extender_engraver,
150 /* doc */ "Create lyric extenders",
151 /* create */ "LyricExtender",
152 /* accept */ "extender-event",