* buildscripts/guile-gnome.sh: Build without gcc libtool version

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

diff --git a/lily/extender-engraver.cc b/lily/extender-engraver.cc
index a6bcd2593ee6c6dda7ef28afd6590be4023fa5e5..f2f9d6761411002a89e47b853e55c9fe9c9b4843 100644 (file)
--- a/lily/extender-engraver.cc
+++ b/lily/extender-engraver.cc
@@ -1,46 +1,33 @@
 /*
   extender-engraver.cc -- implement Extender_engraver
 
-  (c) 1999 Glen Prideaux <glenprideaux@iname.com>,
-  Han-Wen Nienhuys, Jan Nieuwenhuizen.
+  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 "flower-proto.hh"
-#include "musical-request.hh"
+#include "warn.hh"
 #include "lyric-extender.hh"
-#include "paper-column.hh"
 #include "item.hh"
 #include "engraver.hh"
-#include "drul-array.hh"
-#include "lyric-extender.hh"
-#include "pqueue.hh"
-
-
-/**
-  Generate an centred extender.  Should make a Extender_spanner that
-  typesets a nice centred extender of varying length depending on the
-  gap between syllables.
+#include "context.hh"
+#include "group-interface.hh"
 
-  We remember the last Item that come across. When we get a
-  request, we create the spanner, and attach the left point to the
-  last lyrics, and the right point to any lyrics we receive by
-  then.  */
 class Extender_engraver : public Engraver
 {
-  Grob *last_lyric_l_;
-  Grob *current_lyric_l_;
-  Extender_req* req_l_;
-  Spanner* extender_p_;
+  Music* ev_;
+  Spanner* extender_;
+  Spanner * pending_extender_;  
 public:
-  TRANSLATOR_DECLARATIONS(Extender_engraver);
+  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 start_translation_timestep ();
   virtual void process_music ();
 private:
 
@@ -51,99 +38,128 @@ private:
 
 Extender_engraver::Extender_engraver ()
 {
-  current_lyric_l_ = 0;
-  last_lyric_l_ = 0;
-  extender_p_ = 0;
-  req_l_ = 0;
+  extender_ = 0;
+  pending_extender_ = 0;
+  ev_ = 0;
+}
+
+bool
+Extender_engraver::try_music (Music* r)
+{
+  if (ev_)
+    return false;
+
+  ev_ = r;
+  return true;
 }
 
+
 void
-Extender_engraver::acknowledge_grob (Grob_info i)
+Extender_engraver::process_music ()
 {
-  // -> text_item
-  if (i.grob_l_->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+  if (ev_)
     {
-      current_lyric_l_ = i.grob_l_;
-      if (extender_p_
-         && !extender_p_->get_bound (RIGHT)
-           )
-         {
-           Lyric_extender::set_textitem (extender_p_, RIGHT, dynamic_cast<Item*> (i.grob_l_));
-         }
+      extender_ = make_spanner ("LyricExtender", ev_->self_scm ());
     }
 }
 
 
-bool
-Extender_engraver::try_music (Music* r)
+void
+Extender_engraver::acknowledge_grob (Grob_info i)
 {
-  if (Extender_req* p = dynamic_cast <Extender_req *> (r))
+  Item * item =  dynamic_cast<Item*> (i.grob_);
+
+  if (item
+      && item->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
     {
-      if (req_l_)
-       return false;
+      if (extender_)
+       extender_->set_bound (LEFT, item);
 
-      req_l_ = p;
-      return true;
+      if (pending_extender_)
+       pending_extender_->set_bound (RIGHT, item);
     }
-  return false;
 }
 
 void
-Extender_engraver::finalize ()
+Extender_engraver::stop_translation_timestep ()
 {
-  if (extender_p_)
+  if (pending_extender_ && pending_extender_->get_bound (RIGHT))
+    {
+      pending_extender_ = 0;
+    }
+
+  if (extender_ || pending_extender_)
     {
-      req_l_->origin ()->warning (_ ("unterminated extender"));
-      extender_p_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+      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;
+       }
     }
+
+  ev_ = 0;
 }
 
 void
-Extender_engraver::process_music ()
+completize_extender (Spanner* sp)
 {
-  if (req_l_ && ! extender_p_)
+  if (!sp->get_bound (RIGHT))
     {
-      if (!last_lyric_l_)
+      SCM heads = sp->get_property ("heads");
+      if (ly_c_pair_p (heads))
        {
-         req_l_->origin ()->warning (_ ("Nothing to connect extender to on the left.  Ignoring extender request."));
-         return;
+         Item* it = dynamic_cast<Item*> (unsmob_grob (ly_car (heads)));
+         if (it)
+           sp->set_bound (RIGHT, it);
        }
-      
-      extender_p_ = new Spanner (get_property ("LyricExtender"));
-
-
-      Lyric_extender::set_textitem (extender_p_, LEFT, last_lyric_l_);
-      announce_grob(extender_p_, req_l_->self_scm());
     }
 }
 
+  
 
 void
-Extender_engraver::stop_translation_timestep ()
+Extender_engraver::finalize ()
 {
-  if (extender_p_)
+  if (extender_)
     {
-      typeset_grob (extender_p_);
-      extender_p_ = 0;
+      completize_extender (extender_);
+
+      if (!extender_->get_bound (RIGHT))
+       extender_->warning (_ ("unterminated extender"));
+      extender_ = 0;
     }
 
-  if (current_lyric_l_)
+  if (pending_extender_)
     {
-      last_lyric_l_ = current_lyric_l_;
-      current_lyric_l_ =0;
+      completize_extender (pending_extender_);
+
+      if (!pending_extender_->get_bound (RIGHT))
+         pending_extender_->warning (_("unterminated extender"));
+      pending_extender_ =0;
     }
 }
 
-void
-Extender_engraver::start_translation_timestep ()
-{
-  req_l_ = 0;
-}
 
 
-ENTER_DESCRIPTION(Extender_engraver,
+
+
+ENTER_DESCRIPTION (Extender_engraver,
 /* descr */       "Create lyric extenders",
 /* creats*/       "LyricExtender",
+/* accepts */     "extender-event",
 /* acks  */       "lyric-syllable-interface",
 /* reads */       "",
 /* write */       "");