source file of the GNU LilyPond music typesetter
- (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 2000--2002 Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include "engraver.hh"
class Voice_devnull_engraver : public Engraver
{
public:
- VIRTUAL_COPY_CONS (Translator);
+ TRANSLATOR_DECLARATIONS(Voice_devnull_engraver);
protected:
- virtual void acknowledge_element (Score_element_info);
+ virtual bool try_music (Music *m);
+ virtual void acknowledge_grob (Grob_info);
};
-ADD_THIS_TRANSLATOR (Voice_devnull_engraver);
-static char const *junk_interfaces[] = {
+
+static char const *eat_spanners[] = {
+ "beam",
+ "crescendo",
+ "decrescendo",
+ "slur",
+ 0
+};
+
+bool
+Voice_devnull_engraver::try_music (Music *m)
+{
+ SCM s = get_property ("devNullVoice");
#if 0
- "beam-interface",
+ /* No need */
+ if (gh_equal_p (s, ly_symbol2scm ("never")))
+ return;
#endif
+
+ if (gh_equal_p (s, ly_symbol2scm ("allways"))
+ || (s == SCM_EOL
+ && daddy_trans_l_->id_str_.left_str (3) == "two"
+ && (to_boolean (get_property ("unison"))
+ || to_boolean (get_property ("unisilence")))))
+ {
+ if (Span_req *s = dynamic_cast <Span_req *> (m))
+ {
+ SCM t = s->get_mus_property ("span-type");
+
+ for (char const **p = eat_spanners; *p; p++)
+ {
+ if (t == ly_str02scm (*p))
+ return true;
+ }
+ }
+ /* Ugh. Should eat other requests, script etc. too. */
+ else if (dynamic_cast<Tie_req*> (m))
+ return true;
+ }
+ return false;
+}
+
+static char const *junk_interfaces[] = {
+ "beam-interface",
+ "dynamic-interface",
+ "hairpin-interface",
+ "multi-measure-rest-interface",
+ "script-interface",
"slur-interface",
- "tie-interface",
+ "text-interface",
"text-item-interface",
"text-script-interface",
- "dynamic-interface",
- "crescendo-interface",
+ "text-spanner-interface",
+ "tie-interface",
0
};
void
-Voice_devnull_engraver::acknowledge_element (Score_element_info i)
+Voice_devnull_engraver::acknowledge_grob (Grob_info i)
{
- if (daddy_trans_l_->id_str_ == "two"
- && (to_boolean (get_property ("unison"))
- || to_boolean (get_property ("unisilence"))))
+ SCM s = get_property ("devNullVoice");
+#if 0
+ /* No need, next if will never be true */
+ if (s == ly_symbol2scm ("never"))
+ return;
+#endif
+
+ if (s == ly_symbol2scm ("allways")
+ || (s == SCM_EOL
+ && daddy_trans_l_->id_str_.left_str (3) == "two"
+ && (to_boolean (get_property ("unison"))
+ || to_boolean (get_property ("unisilence")))))
for (char const **p = junk_interfaces; *p; p++)
- if (i.elem_l_->has_interface (ly_symbol2scm (*p)))
+ if (i.grob_l_->has_interface (ly_symbol2scm (*p)))
{
- i.elem_l_->suicide ();
+#if 0
+ /* Ugh: virtual mmrest::suicide () ? */
+ if (i.grob_l_->has_interface (ly_symbol2scm ("multi-measure-rest-interface")))
+ i.grob_l_->set_grob_property ("skip-timestep", SCM_BOOL_T);
+ else
+ ;
+#endif
+ /* Ugh, we can suicide them, but they remain living */
+ i.grob_l_->suicide ();
return;
}
}
+
+Voice_devnull_engraver::Voice_devnull_engraver(){}
+
+ENTER_DESCRIPTION(Voice_devnull_engraver,
+/* descr */ "Kill off certain items and spanners if we're Voice `two' and unison or unisilence is set.",
+/* creats*/ "",
+/* acks */ "grob-interface",
+/* reads */ "",
+/* write */ "");