Issue 5167/6: Changes: show \markup xxx = ... \etc assignments

[lilypond.git] / lily / time-signature-engraver.cc

diff --git a/lily/time-signature-engraver.cc b/lily/time-signature-engraver.cc
index 60724a66fd612fcb05b2856191ef26785a19f97b..e4e76e17d685154c2868ab75c2efd8d8feae5dbe 100644 (file)
--- a/lily/time-signature-engraver.cc
+++ b/lily/time-signature-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -22,9 +22,12 @@
 #include "item.hh"
 #include "international.hh"
 #include "misc.hh"
-#include "time-signature.hh"
+#include "moment.hh"
+#include "stream-event.hh"
 #include "warn.hh"
 
+#include "translator.icc"
+
 /**
    generate time_signatures.
 */
@@ -32,6 +35,7 @@ class Time_signature_engraver : public Engraver
 {
   Item *time_signature_;
   SCM last_time_fraction_;
+  SCM time_cause_;
 
 protected:
   virtual void derived_mark () const;
@@ -39,31 +43,46 @@ protected:
   void process_music ();
 public:
   TRANSLATOR_DECLARATIONS (Time_signature_engraver);
+  void listen_time_signature (Stream_event *);
 };
 
 void
 Time_signature_engraver::derived_mark () const
 {
   scm_gc_mark (last_time_fraction_);
+  scm_gc_mark (time_cause_);
 }
 
-Time_signature_engraver::Time_signature_engraver ()
+Time_signature_engraver::Time_signature_engraver (Context *c)
+  : Engraver (c)
 {
   time_signature_ = 0;
+  time_cause_ = SCM_EOL;
   last_time_fraction_ = SCM_BOOL_F;
 }
 
+void
+Time_signature_engraver::listen_time_signature (Stream_event *ev)
+{
+  time_cause_ = ev->self_scm ();
+}
+
 void
 Time_signature_engraver::process_music ()
 {
-  /*
-    not rigorously safe, since the value might get GC'd and
-    reallocated in the same spot */
+  if (time_signature_)
+    return;
+
   SCM fr = get_property ("timeSignatureFraction");
-  if (!time_signature_
-      && last_time_fraction_ != fr
-      && scm_is_pair (fr))
+  if (!scm_is_eq (last_time_fraction_, fr) && scm_is_pair (fr))
     {
+      time_signature_ = make_item ("TimeSignature", time_cause_);
+      time_signature_->set_property ("fraction", fr);
+
+      if (scm_is_false (last_time_fraction_))
+        time_signature_->set_property ("break-visibility",
+                                       get_property ("initialTimeSignatureVisibility"));
+
       int den = scm_to_int (scm_cdr (fr));
       if (den != (1 << intlog2 (den)))
         {
@@ -72,18 +91,11 @@ Time_signature_engraver::process_music ()
 
             OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
           */
-          warning (_f ("strange time signature found: %d/%d",
-                       int (scm_to_int (scm_car (fr))),
-                       den));
+          time_signature_->warning (_f ("strange time signature found: %d/%d",
+                                        int (scm_to_int (scm_car (fr))),
+                                        den));
         }
 
-      time_signature_ = make_item ("TimeSignature", SCM_EOL);
-      time_signature_->set_property ("fraction", fr);
-
-      if (last_time_fraction_ == SCM_BOOL_F)
-        time_signature_->set_property ("break-visibility",
-                                       get_property ("implicitTimeSignatureVisibility"));
-
       last_time_fraction_ = fr;
     }
 }
@@ -91,10 +103,23 @@ Time_signature_engraver::process_music ()
 void
 Time_signature_engraver::stop_translation_timestep ()
 {
+  if (time_signature_ && !scm_is_null (time_cause_))
+    {
+      Moment *mp = unsmob<Moment> (get_property ("measurePosition"));
+      if (mp && (mp->main_part_ > Rational (0))
+          && !to_boolean (get_property ("partialBusy")))
+        time_signature_->warning ("mid-measure time signature without \\partial");
+    }
+
   time_signature_ = 0;
+  time_cause_ = SCM_EOL;
 }
 
-#include "translator.icc"
+void
+Time_signature_engraver::boot ()
+{
+  ADD_LISTENER (Time_signature_engraver, time_signature);
+}
 
 ADD_TRANSLATOR (Time_signature_engraver,
                 /* doc */
@@ -105,7 +130,8 @@ ADD_TRANSLATOR (Time_signature_engraver,
                 "TimeSignature ",
 
                 /* read */
-                "implicitTimeSignatureVisibility "
+                "initialTimeSignatureVisibility "
+                "partialBusy "
                 "timeSignatureFraction ",
 
                 /* write */