/*
extender-engraver.cc -- implement Extender_engraver
- (c) 1998 Jan Nieuwenhuizen <janneke@gnu.org>
+ source file of the GNU LilyPond music typesetter
+
+ (c) 1999--2004 Glen Prideaux <glenprideaux@iname.com>,
+ Han-Wen Nienhuys <hanwen@cs.uu.nl>,
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "proto.hh"
-#include "musical-request.hh"
-#include "extender-engraver.hh"
-#include "extender-spanner.hh"
-#include "text-def.hh"
-#include "score-column.hh"
-#include "text-item.hh"
-
-IMPLEMENT_IS_TYPE_B1 (Extender_engraver,Engraver);
-ADD_THIS_TRANSLATOR (Extender_engraver);
+#include "warn.hh"
+#include "lyric-extender.hh"
+#include "item.hh"
+#include "engraver.hh"
+#include "context.hh"
+#include "group-interface.hh"
-Extender_engraver::Extender_engraver ()
+class Extender_engraver : public Engraver
{
- extender_spanner_p_ = 0;
- span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
-}
+ Music* ev_;
+ Spanner* extender_;
+ Spanner * pending_extender_;
+public:
+ TRANSLATOR_DECLARATIONS (Extender_engraver);
-void
-Extender_engraver::acknowledge_element (Score_element_info i)
+protected:
+ virtual void acknowledge_grob (Grob_info);
+ virtual void finalize ();
+ virtual bool try_music (Music*);
+ virtual void stop_translation_timestep ();
+ virtual void process_music ();
+private:
+
+};
+
+
+
+
+Extender_engraver::Extender_engraver ()
{
- Text_item* t = (dynamic_cast<Text_item*> (i.elem_l_));
- if (!t)
- return;
- if (!extender_spanner_p_)
- return;
- if (!span_reqs_drul_[LEFT])
- return;
-
- if (!extender_spanner_p_->textitem_l_drul_[LEFT])
- extender_spanner_p_->set_textitem (LEFT, t);
- else
- if (span_reqs_drul_[RIGHT] && !extender_spanner_p_->textitem_l_drul_[RIGHT])
- extender_spanner_p_->set_textitem (RIGHT, t);
+ extender_ = 0;
+ pending_extender_ = 0;
+ ev_ = 0;
}
bool
-Extender_engraver::do_try_request (Request* req_l)
+Extender_engraver::try_music (Music* r)
{
- Extender_req* p = dynamic_cast <Extender_req *> (req_l);
- if (!p)
+ if (ev_)
return false;
- if (bool (extender_spanner_p_) == bool (p->spantype == Span_req::START))
- return false;
+ ev_ = r;
+ return true;
+}
- Direction d = (!extender_spanner_p_) ? LEFT : RIGHT;
- if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (req_l))
- return false;
- span_reqs_drul_[d] = p;
- span_mom_drul_[d] = get_staff_info ().musical_l ()->when ();
- return true;
+void
+Extender_engraver::process_music ()
+{
+ if (ev_)
+ {
+ extender_ = make_spanner ("LyricExtender");
+ announce_grob (extender_, ev_->self_scm ());
+ }
}
+
void
-Extender_engraver::do_removal_processing ()
+Extender_engraver::acknowledge_grob (Grob_info i)
{
- if (extender_spanner_p_)
+ Item * item = dynamic_cast<Item*> (i.grob_);
+
+ if (item
+ && item->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
{
- span_reqs_drul_[LEFT]->warning (_ ("unterminated extender"));
- extender_spanner_p_->unlink ();
- delete extender_spanner_p_;
- extender_spanner_p_ = 0;
- span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+ if (extender_)
+ extender_->set_bound (LEFT, item);
+
+ if (pending_extender_)
+ pending_extender_->set_bound (RIGHT, item);
}
}
void
-Extender_engraver::do_process_requests ()
+Extender_engraver::stop_translation_timestep ()
{
- if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
- return;
+ if (pending_extender_ && pending_extender_->get_bound (RIGHT))
+ {
+ typeset_grob (pending_extender_);
+ pending_extender_ = 0;
+ }
- extender_spanner_p_ = new Extender_spanner;
+ if (extender_ || pending_extender_)
+ {
+ Context *voice = get_voice_to_lyrics (daddy_context_);
+ Grob* h = (voice) ? get_current_note_head (voice) : 0;
+
+ if (h)
+ {
+ if (extender_)
+ Pointer_group_interface::add_grob (extender_,
+ ly_symbol2scm ("heads"), h);
+ if (pending_extender_)
+ Pointer_group_interface::add_grob (pending_extender_,
+ ly_symbol2scm ("heads"), h);
+ }
+
+ if (extender_)
+ {
+ pending_extender_ = extender_;
+ extender_ = 0;
+ }
+ }
- announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
+ ev_ = 0;
}
void
-Extender_engraver::do_pre_move_processing ()
+completize_extender (Spanner* sp)
{
- if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT])
- return;
+ if (!sp->get_bound (RIGHT))
+ {
+ SCM heads = sp->get_property ("heads");
+ if (gh_pair_p (heads))
+ {
+ Item* it = dynamic_cast<Item*> (unsmob_grob (gh_car (heads)));
+ if (it)
+ sp->set_bound (RIGHT, it);
+ }
+ }
+}
- typeset_element (extender_spanner_p_);
- extender_spanner_p_ = 0;
- span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+
+void
+Extender_engraver::finalize ()
+{
+ if (extender_)
+ {
+ completize_extender (extender_);
+
+ if (!extender_->get_bound (RIGHT))
+ extender_->warning (_ ("unterminated extender"));
+ typeset_grob (extender_);
+ extender_ = 0;
+ }
+
+ if (pending_extender_)
+ {
+ completize_extender (pending_extender_);
+
+ if (!pending_extender_->get_bound (RIGHT))
+ pending_extender_->warning (_("unterminated extender"));
+ typeset_grob (pending_extender_);
+ pending_extender_ =0;
+ }
}
+
+
+
+
+ENTER_DESCRIPTION (Extender_engraver,
+/* descr */ "Create lyric extenders",
+/* creats*/ "LyricExtender",
+/* accepts */ "extender-event",
+/* acks */ "lyric-syllable-interface",
+/* reads */ "",
+/* write */ "");