2003 -> 2004

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

diff --git a/lily/extender-engraver.cc b/lily/extender-engraver.cc
index 3cf5b3455c9c487e484a3c40e90b0332a2a14ac0..323edb8ea66a3a257d63d2c40a62984244c6979e 100644 (file)
--- a/lily/extender-engraver.cc
+++ b/lily/extender-engraver.cc
@@ -1,92 +1,153 @@
 /*
   extender-engraver.cc -- implement Extender_engraver
 
-  (c) 1998--1999 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 "g-text-item.hh"
+#include "warn.hh"
+#include "lyric-extender.hh"
+#include "item.hh"
+#include "engraver.hh"
+
+class Extender_engraver : public Engraver
+{
+  Music* ev_;
+  Spanner* extender_;
+  Spanner * finished_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 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;
+  extender_ = 0;
+  finished_extender_ = 0;
+  ev_ = 0;
 }
 
 void
-Extender_engraver::acknowledge_element (Score_element_info i)
+Extender_engraver::acknowledge_grob (Grob_info i)
 {
-  G_text_item* t = dynamic_cast<G_text_item*> (i.elem_l_);
-  if (!t)
-    return;
-  if (!extender_spanner_p_)
-    return;
-  if (!span_reqs_drul_[LEFT])
-    return;
-
-  if (!extender_spanner_p_->item_l_drul_[LEFT])
-    extender_spanner_p_->set_textitem (LEFT, t);
-  else
-    if (span_reqs_drul_[RIGHT] && !extender_spanner_p_->item_l_drul_[RIGHT]) 
-      extender_spanner_p_->set_textitem (RIGHT, t);
+  Item * item =  dynamic_cast<Item*> (i.grob_);
+  // -> text_item
+  if (item && item->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+    {
+      if (extender_)
+       extender_->set_bound (LEFT, item);
+
+      if (finished_extender_)
+       finished_extender_->set_bound (RIGHT, item);
+    }
 }
 
+
 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_ == START))
-       return false;
+  if (ev_)
+    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;
+  ev_ = r;
+  return true;
 }
 
 void
-Extender_engraver::do_removal_processing ()
+completize_extender (Spanner* sp)
 {
-  if (extender_spanner_p_)
+  if (!sp->get_bound (RIGHT))
     {
-      span_reqs_drul_[LEFT]->warning (_ ("unterminated extender"));
-      extender_spanner_p_->set_bounds(RIGHT, get_staff_info ().command_l ());
+      SCM heads = sp->get_grob_property ("heads");
+      if (gh_pair_p (heads))
+       {
+         Item* it = dynamic_cast<Item*> (unsmob_grob (gh_car (heads)));
+         if (it)
+           sp->set_bound (RIGHT, it);
+       }
     }
 }
 
+  
+
 void
-Extender_engraver::do_process_requests ()
+Extender_engraver::finalize ()
 {
-  if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
-    return;
+  if (extender_)
+    {
+      completize_extender (extender_);
 
-  extender_spanner_p_ = new Extender_spanner;
+      if (!extender_->get_bound (RIGHT))
+       extender_->warning (_ ("unterminated extender"));
+      typeset_grob (extender_);
+      extender_ = 0;
+    }
 
-  announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
+  if (finished_extender_)
+    {
+      completize_extender (finished_extender_);
+
+      if (!finished_extender_->get_bound (RIGHT))
+         finished_extender_->warning (_("unterminated extender"));
+      typeset_grob (finished_extender_);
+      finished_extender_ =0;
+    }
 }
 
 void
-Extender_engraver::do_pre_move_processing ()
+Extender_engraver::process_music ()
 {
-  if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT]) 
-    return;
+  if (ev_)
+    {
+      extender_ = make_spanner ("LyricExtender");
+      announce_grob (extender_, ev_->self_scm());
+    }
+}
+
 
-  typeset_element (extender_spanner_p_);
+void
+Extender_engraver::stop_translation_timestep ()
+{
+  if (finished_extender_ && finished_extender_->get_bound (RIGHT))
+    {
+      typeset_grob (finished_extender_);
+      finished_extender_ = 0;
+    }
+
+  if (finished_extender_ && extender_)
+    {
+      programming_error ("Haven't finished extender yet.");
+      typeset_grob (finished_extender_);
+      finished_extender_ =0;
+    }
   
-  extender_spanner_p_ = 0;
-  span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+  if (extender_)
+    finished_extender_ = extender_;
+  extender_ = 0;
+
+  ev_ = 0;
 }
 
+
+
+ENTER_DESCRIPTION(Extender_engraver,
+/* descr */       "Create lyric extenders",
+/* creats*/       "LyricExtender",
+/* accepts */     "extender-event",
+/* acks  */       "lyric-syllable-interface",
+/* reads */       "",
+/* write */       "");