release: 1.5.29

[lilypond.git] / lily / output-property-engraver.cc

diff --git a/lily/output-property-engraver.cc b/lily/output-property-engraver.cc
index 6f0b6cf88ffb31a972310db79bd78b34b5a20a56..25c156f539ccb1d3626bfb0f262349e10d6f1deb 100644 (file)
--- a/lily/output-property-engraver.cc
+++ b/lily/output-property-engraver.cc
@@ -3,64 +3,87 @@
   
   source file of the GNU LilyPond music typesetter
   
-  (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 2000--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   
  */
 
-#include "output-property.hh"
 #include "engraver.hh"
-#include "score-element.hh"
+#include "grob.hh"
+#include "output-property-music-iterator.hh"
 
 class Output_property_engraver : public Engraver
 {
-public:
-  VIRTUAL_COPY_CONS(Translator);
+TRANSLATOR_DECLARATIONS(Output_property_engraver);
 protected:
+
+  /*
+    should do this with \once and \push ?
+
+
+      \property Voice.outputProperties \push #pred = #modifier
+
+      where both MODIFIER and PRED are functions taking a
+      grob.
+      
+   */
+
   
-  Link_array<Output_property> props_;
+  Link_array<Music> props_;
 
-  virtual void do_pre_move_processing ();
-  virtual void acknowledge_element (Score_element_info);
-  virtual bool do_try_music (Music*);
+  virtual void stop_translation_timestep ();
+  virtual void acknowledge_grob (Grob_info);
+  virtual bool try_music (Music*);
 };
 
 
 bool
-Output_property_engraver::do_try_music (Music* m)
+Output_property_engraver::try_music (Music* m)
 {
-  if (Output_property * o = dynamic_cast<Output_property*> (m))
+  if (m->get_mus_property ("iterator-ctor") ==
+      Output_property_music_iterator::constructor_cxx_function)
     {
-      props_.push (o);
+      props_.push (m);
       return true;
     }
   return false;
 }
 
 void
-Output_property_engraver::acknowledge_element (Score_element_info inf)
+Output_property_engraver::acknowledge_grob (Grob_info inf)
 {
-  for (int i=props_.size (); i--; )
+  for (int i=props_.size (); i--;)
     {
-      Output_property * o = props_[i];
-      SCM pred = gh_car (o->pred_sym_val_list_);
+      Music * o = props_[i];
+      SCM pred = o->get_mus_property ("predicate");
+      
       /*
        should typecheck pred. 
        */
       SCM result=gh_apply (pred,
-                          gh_list (inf.elem_l_->self_scm_, SCM_UNDEFINED));
+                          scm_list_n (inf.grob_l_->self_scm (), SCM_UNDEFINED));
       if (to_boolean (result))
        {
-         Score_element::ly_set_elt_property (inf.elem_l_->self_scm_,
-                                             gh_cadr (o->pred_sym_val_list_),
-                                             gh_caddr (o->pred_sym_val_list_));
+         SCM sym = o->get_mus_property ("grob-property");
+         SCM val = o->get_mus_property ("grob-value");
+         inf.grob_l_->internal_set_grob_property (sym, val);
        }
     }
 }
 
 void
-Output_property_engraver::do_pre_move_processing ()
+Output_property_engraver::stop_translation_timestep ()
 {
   props_.clear ();
 }
 
-ADD_THIS_TRANSLATOR(Output_property_engraver);
+Output_property_engraver::Output_property_engraver()
+{
+}
+
+ENTER_DESCRIPTION(Output_property_engraver,
+/* descr */       "Interpret Music of Output_property type, and apply a function
+to any Graphic objects that satisfies the predicate.",
+/* creats*/       "",
+/* acks  */       "grob-interface",
+/* reads */       "",
+/* write */       "");