*** empty log message ***

[lilypond.git] / lily / extender-engraver.cc

diff --git a/lily/extender-engraver.cc b/lily/extender-engraver.cc
index 32c3e5787fcfa1950e58cf21aedf1edb076370ad..c6fb7167e3f0f785e2f236b0bd9556349d348afe 100644 (file)
--- a/lily/extender-engraver.cc
+++ b/lily/extender-engraver.cc
@@ -1,95 +1,161 @@
 /*
   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"
+#include "context.hh"
+#include "engraver.hh"
+#include "group-interface.hh"
+#include "item.hh"
+#include "lyric-extender.hh"
+#include "note-head.hh"
+#include "warn.hh"
 
-ADD_THIS_TRANSLATOR (Extender_engraver);
+void completize_extender (Spanner *sp);
 
-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_;
 
-void
-Extender_engraver::acknowledge_element (Score_element_info i)
+public:
+  TRANSLATOR_DECLARATIONS (Extender_engraver);
+
+protected:
+  virtual void acknowledge_grob (Grob_info);
+  virtual void finalize ();
+  virtual bool try_music (Music*);
+  virtual void stop_translation_timestep ();
+  virtual void process_music ();
+};
+
+
+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_music (Music* req_l)
+Extender_engraver::try_music (Music *r)
 {
-  if (Extender_req* p = dynamic_cast <Extender_req *> (req_l))
+  if (!ev_)
     {
-      if (bool (extender_spanner_p_) == bool (p->spantype == Span_req::START))
-       return false;
-
-      Direction d = (!extender_spanner_p_) ? LEFT : RIGHT;
-      if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (p))
-       return false;
-
-      span_reqs_drul_[d] = p;
-      span_mom_drul_[d] = get_staff_info ().musical_l ()->when ();
+      ev_ = r;
       return true;
     }
   return false;
 }
 
 void
-Extender_engraver::do_removal_processing ()
+Extender_engraver::process_music ()
 {
-  if (extender_spanner_p_)
+  if (ev_)
+    extender_ = make_spanner ("LyricExtender", ev_->self_scm ());
+}
+
+void
+Extender_engraver::acknowledge_grob (Grob_info i)
+{
+  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_property ("next", item->self_scm ());
+         completize_extender (pending_extender_);
+         pending_extender_ = 0;
+       }
     }
 }
 
 void
-Extender_engraver::do_process_requests ()
+Extender_engraver::stop_translation_timestep ()
 {
-  if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
-    return;
+  if (extender_ || pending_extender_)
+    {
+      Context *voice = get_voice_to_lyrics (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;
+       }
+    }
 
-  extender_spanner_p_ = new Extender_spanner;
+  ev_ = 0;
+}
 
-  announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
+void
+completize_extender (Spanner *sp)
+{
+  if (!sp->get_bound (RIGHT))
+    {
+      SCM heads = sp->get_property ("heads");
+      if (scm_is_pair (heads))
+       {
+         Item *it = dynamic_cast<Item*> (unsmob_grob (scm_car (heads)));
+         if (it)
+           sp->set_bound (RIGHT, it);
+       }
+    }
 }
 
 void
-Extender_engraver::do_pre_move_processing ()
+Extender_engraver::finalize ()
 {
-  if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT]) 
-    return;
+  if (extender_)
+    {
+      completize_extender (extender_);
 
-  typeset_element (extender_spanner_p_);
-  
-  extender_spanner_p_ = 0;
-  span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+      if (!extender_->get_bound (RIGHT))
+       extender_->warning (_ ("unterminated extender"));
+      extender_ = 0;
+    }
+
+  if (pending_extender_)
+    {
+      completize_extender (pending_extender_);
+
+      if (!pending_extender_->get_bound (RIGHT))
+       pending_extender_->warning (_ ("unterminated extender"));
+      pending_extender_ =0;
+    }
 }
 
+
+ENTER_DESCRIPTION (Extender_engraver,
+/* descr */       "Create lyric extenders",
+/* creats*/       "LyricExtender",
+/* accepts */     "extender-event",
+/* acks  */       "lyric-syllable-interface",
+/* reads */       "",
+/* write */       "");