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

[lilypond.git] / lily / bar-number-engraver.cc

diff --git a/lily/bar-number-engraver.cc b/lily/bar-number-engraver.cc
index 83ff7fed5148f8a39034973a031266b7552d8b25..44f155df6e24298ca81a6f20c45b8b63904abd74 100644 (file)
--- a/lily/bar-number-engraver.cc
+++ b/lily/bar-number-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
@@ -45,14 +45,13 @@ protected:
 
 protected:
   void stop_translation_timestep ();
-  DECLARE_TRANSLATOR_LISTENER (alternative);
-  DECLARE_ACKNOWLEDGER (break_alignment);
+  void listen_alternative (Stream_event *);
+  void acknowledge_break_alignment (Grob_info);
   void process_music ();
   void create_items ();
   TRANSLATOR_DECLARATIONS (Bar_number_engraver);
 };
 
-IMPLEMENT_TRANSLATOR_LISTENER (Bar_number_engraver, alternative);
 void
 Bar_number_engraver::listen_alternative (Stream_event *ev)
 {
@@ -62,8 +61,10 @@ Bar_number_engraver::listen_alternative (Stream_event *ev)
   alternative_event_ = ev;
   int current_barnumber = robust_scm2int (get_property ("currentBarNumber"), 0);
   Direction alternative_dir = robust_scm2dir (ev->get_property ("alternative-dir"), CENTER);
-  bool make_alternative = get_property ("alternativeNumberingStyle") == ly_symbol2scm ("numbers")
-                          || get_property ("alternativeNumberingStyle") == ly_symbol2scm ("numbers-with-letters");
+  bool make_alternative = scm_is_eq (get_property ("alternativeNumberingStyle"),
+                                     ly_symbol2scm ("numbers"))
+                          || scm_is_eq (get_property ("alternativeNumberingStyle"),
+                                        ly_symbol2scm ("numbers-with-letters"));
   if (make_alternative)
     {
       /*
@@ -84,16 +85,6 @@ Bar_number_engraver::listen_alternative (Stream_event *ev)
     }
 }
 
-int
-int_pow (int n, int i)
-{
-  if (i == 1)
-    return n;
-  if (i <= 0)
-    return 1;
-  return int_pow (n * n, i - 1);
-}
-
 void
 Bar_number_engraver::process_music ()
 {
@@ -102,65 +93,50 @@ Bar_number_engraver::process_music ()
   if (scm_is_string (wb))
     {
       Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
-      if (mp.main_part_ == Rational (0))
+      SCM bn = get_property ("currentBarNumber");
+      SCM proc = get_property ("barNumberVisibility");
+      if (scm_is_number (bn) && ly_is_procedure (proc)
+          && to_boolean (scm_call_2 (proc, bn, mp.smobbed_copy ())))
         {
-          SCM bn = get_property ("currentBarNumber");
-          SCM proc = get_property ("barNumberVisibility");
-          if (scm_is_number (bn) && ly_is_procedure (proc)
-              && to_boolean (scm_call_1 (proc, bn)))
+          create_items ();
+          SCM alternative_style = get_property ("alternativeNumberingStyle");
+          string text_tag = "";
+          if (scm_is_eq (alternative_style, ly_symbol2scm ("numbers-with-letters")))
             {
-              create_items ();
-              SCM alternative_style = get_property ("alternativeNumberingStyle");
-              string text_tag = "";
-              if (alternative_style == ly_symbol2scm ("numbers-with-letters"))
+              if (alternative_event_)
                 {
-                  if (alternative_event_)
-                    {
-                      Direction alternative_dir = robust_scm2dir (alternative_event_->get_property ("alternative-dir"), RIGHT);
-                      switch (alternative_dir)
-                        {
-                        case LEFT:
-                          alternative_number_ = 0;
-                          break;
-                        case CENTER:
-                          break;
-                        case RIGHT:
-                          alternative_number_ = INT_MIN;
-                          break;
-                        default:
-                          assert (false);
-                        }
-                      alternative_number_ += alternative_number_increment_;
-
-                      alternative_number_increment_ = robust_scm2int (alternative_event_->get_property ("alternative-increment"), 1);
-                    }
-                  if (alternative_number_ >= 0)
+                  Direction alternative_dir = robust_scm2dir (alternative_event_->get_property ("alternative-dir"), RIGHT);
+                  switch (alternative_dir)
                     {
-                      string alphabet = "abcdefghijklmnopqrstuvwxyz";
-                      int power = 0;
-                      int running_sum = 0;
-                      int scratch = alternative_number_;
-                      while (running_sum <= alternative_number_)
-                        {
-                          power++;
-                          running_sum += int_pow (26, power);
-                        }
-                      scratch += int_pow (26, power) - running_sum;
-                      for (int i = power; i--;)
-                        text_tag += alphabet.at ((scratch / int_pow (26, i)) % 26);
+                    case LEFT:
+                      alternative_number_ = 0;
+                      break;
+                    case CENTER:
+                      break;
+                    case RIGHT:
+                      alternative_number_ = INT_MIN;
+                      break;
+                    default:
+                      assert (false);
                     }
+                  alternative_number_ += alternative_number_increment_;
+
+                  alternative_number_increment_ = robust_scm2int (alternative_event_->get_property ("alternative-increment"), 1);
                 }
-              // guh.
-              text_->set_property
-                ("text",
-                  scm_string_concatenate (scm_list_2 (scm_number_to_string (bn, scm_from_int (10)),
-                                                      ly_string2scm (text_tag))));
             }
+          SCM formatter = get_property ("barNumberFormatter");
+          if (ly_is_procedure (formatter))
+            text_->set_property ("text", scm_call_4 (formatter,
+                                                     bn,
+                                                     mp.smobbed_copy (),
+                                                     scm_from_int (alternative_number_),
+                                                     context ()->self_scm ()));
         }
     }
 }
 
-Bar_number_engraver::Bar_number_engraver ()
+Bar_number_engraver::Bar_number_engraver (Context *c)
+  : Engraver (c)
 {
   text_ = 0;
   alternative_starting_bar_number_ = 0;
@@ -201,7 +177,13 @@ Bar_number_engraver::create_items ()
   text_ = make_item ("BarNumber", SCM_EOL);
 }
 
-ADD_ACKNOWLEDGER (Bar_number_engraver, break_alignment);
+
+void
+Bar_number_engraver::boot ()
+{
+  ADD_LISTENER (Bar_number_engraver, alternative);
+  ADD_ACKNOWLEDGER (Bar_number_engraver, break_alignment);
+}
 
 ADD_TRANSLATOR (Bar_number_engraver,
                 /* doc */
@@ -219,6 +201,7 @@ ADD_TRANSLATOR (Bar_number_engraver,
                 "currentBarNumber "
                 "whichBar "
                 "stavesFound "
+                "barNumberFormatter "
                 "barNumberVisibility "
                 "alternativeNumberingStyle ",