* lily/parser.yy (relative_music): whoops. All \relative were off

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

diff --git a/lily/extender-engraver.cc b/lily/extender-engraver.cc
index 32c3e5787fcfa1950e58cf21aedf1edb076370ad..25ca7a65b9aa5dbcaa1ca92cc29623d6d9c1cfc4 100644 (file)
--- a/lily/extender-engraver.cc
+++ b/lily/extender-engraver.cc
@@ -1,95 +1,148 @@
 /*
   extender-engraver.cc -- implement Extender_engraver
 
-  (c) 1998 Jan Nieuwenhuizen <janneke@gnu.org>
+  source file of the GNU LilyPond music typesetter
+  
+  (c)  1999--2003 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 "flower-proto.hh"
+#include "event.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.
+
+  We remember the last Item that come across. When we get a
+  event, 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_;
+  Grob *current_lyric_;
+  Music* req_;
+  Spanner* extender_;
+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 start_translation_timestep ();
+  virtual void process_music ();
+private:
+
+};
+
+
 
-ADD_THIS_TRANSLATOR (Extender_engraver);
 
 Extender_engraver::Extender_engraver ()
 {
-  extender_spanner_p_ = 0;
-  span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+  current_lyric_ = 0;
+  last_lyric_ = 0;
+  extender_ = 0;
+  req_ = 0;
 }
 
 void
-Extender_engraver::acknowledge_element (Score_element_info i)
+Extender_engraver::acknowledge_grob (Grob_info i)
 {
-  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);
+  // -> text_item
+  if (i.grob_->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+    {
+      current_lyric_ = i.grob_;
+      if (extender_
+         && !extender_->get_bound (RIGHT)
+           )
+         {
+           Lyric_extender::set_textitem (extender_, RIGHT, dynamic_cast<Item*> (i.grob_));
+         }
+    }
 }
 
+
 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 (bool (extender_spanner_p_) == bool (p->spantype == Span_req::START))
-       return false;
+  if (req_)
+    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 ();
-      return true;
-    }
-  return false;
+  req_ = r;
+  return true;
 }
 
 void
-Extender_engraver::do_removal_processing ()
+Extender_engraver::finalize ()
 {
-  if (extender_spanner_p_)
+  if (extender_)
     {
-      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;
+      req_->origin ()->warning (_ ("unterminated extender"));
+      extender_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
     }
 }
 
 void
-Extender_engraver::do_process_requests ()
+Extender_engraver::process_music ()
 {
-  if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
-    return;
+  if (req_ && ! extender_)
+    {
+      if (!last_lyric_)
+       {
+         req_->origin ()->warning (_ ("Nothing to connect extender to on the left.  Ignoring extender event."));
+         return;
+       }
+      
+      extender_ = new Spanner (get_property ("LyricExtender"));
 
-  extender_spanner_p_ = new Extender_spanner;
 
-  announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
+      Lyric_extender::set_textitem (extender_, LEFT, last_lyric_);
+      announce_grob(extender_, req_->self_scm());
+    }
 }
 
+
 void
-Extender_engraver::do_pre_move_processing ()
+Extender_engraver::stop_translation_timestep ()
 {
-  if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT]) 
-    return;
+  if (extender_)
+    {
+      typeset_grob (extender_);
+      extender_ = 0;
+    }
 
-  typeset_element (extender_spanner_p_);
-  
-  extender_spanner_p_ = 0;
-  span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+  if (current_lyric_)
+    {
+      last_lyric_ = current_lyric_;
+      current_lyric_ =0;
+    }
+}
+
+void
+Extender_engraver::start_translation_timestep ()
+{
+  req_ = 0;
 }
 
+
+ENTER_DESCRIPTION(Extender_engraver,
+/* descr */       "Create lyric extenders",
+/* creats*/       "LyricExtender",
+/* accepts */     "extender-event",
+/* acks  */      "lyric-syllable-interface",
+/* reads */       "",
+/* write */       "");