lily/percent-repeat-engraver.cc

   1 /*
   2   new-chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>, Erik Sandberg <mandolaerik@gmail.com>
   7 */
   8
   9
  10 #include "score-engraver.hh"
  11
  12 #include "bar-line.hh"
  13 #include "global-context.hh"
  14 #include "international.hh"
  15 #include "item.hh"
  16 #include "misc.hh"
  17 #include "percent-repeat-iterator.hh"
  18 #include "repeated-music.hh"
  19 #include "side-position-interface.hh"
  20 #include "spanner.hh"
  21 #include "stream-event.hh"
  22 #include "warn.hh"
  23
  24 #include "translator.icc"
  25
  26 /*
  27 * TODO: Create separate Double_percent_repeat_engraver?
  28 * Or, at least move double percent handling to Slash_repeat_engraver
  29 */
  30
  31 class Percent_repeat_engraver : public Engraver
  32 {
  33   void typeset_perc ();
  34 public:
  35   TRANSLATOR_DECLARATIONS (Percent_repeat_engraver);
  36
  37 protected:
  38   Stream_event *percent_event_;
  39
  40   /// moment (global time) where percent started.
  41   Moment stop_mom_;
  42   Moment start_mom_;
  43
  44   enum Repeat_sign_type
  45     {
  46       UNKNOWN,
  47       MEASURE,
  48       DOUBLE_MEASURE,
  49     };
  50   Repeat_sign_type repeat_sign_type_;
  51
  52   Spanner *percent_;
  53   Spanner *percent_counter_;
  54
  55 protected:
  56   virtual void finalize ();
  57   DECLARE_TRANSLATOR_LISTENER (percent);
  58
  59   void stop_translation_timestep ();
  60   void start_translation_timestep ();
  61   void process_music ();
  62 };
  63
  64 Percent_repeat_engraver::Percent_repeat_engraver ()
  65 {
  66   percent_ = 0;
  67   percent_counter_ = 0;
  68
  69   percent_event_ = 0;
  70 }
  71
  72 IMPLEMENT_TRANSLATOR_LISTENER (Percent_repeat_engraver, percent);
  73 void
  74 Percent_repeat_engraver::listen_percent (Stream_event *ev)
  75 {
  76   if (!percent_event_)
  77     {
  78       Moment body_length = get_event_length (ev);
  79       Moment meas_len (robust_scm2moment (get_property ("measureLength"),
  80                                           Moment (1)));
  81
  82       if (meas_len == body_length)
  83       {
  84         repeat_sign_type_ = MEASURE;
  85         start_mom_ = now_mom ();
  86         stop_mom_ = now_mom () + body_length;
  87         get_global_context ()->add_moment_to_process (stop_mom_);
  88       }
  89       else if (Moment (2) * meas_len == body_length)
  90       {
  91         repeat_sign_type_ = DOUBLE_MEASURE;
  92         start_mom_ = now_mom () + meas_len;
  93         stop_mom_ = now_mom () + body_length; /* never used */
  94         get_global_context ()->add_moment_to_process (start_mom_);
  95       }
  96       else
  97         return;
  98
  99       percent_event_ = ev;
 100     }
 101 }
 102
 103 void
 104 Percent_repeat_engraver::process_music ()
 105 {
 106   if (percent_event_ && now_mom ().main_part_ == start_mom_.main_part_)
 107     {
 108       if (repeat_sign_type_ == MEASURE)
 109         {
 110           if (percent_)
 111             typeset_perc ();
 112           percent_ = make_spanner ("PercentRepeat", percent_event_->self_scm ());
 113
 114           Grob *col = unsmob_grob (get_property ("currentCommandColumn"));
 115           percent_->set_bound (LEFT, col);
 116
 117           SCM count = percent_event_->get_property ("repeat-count");
 118           if (count != SCM_EOL && to_boolean (get_property ("countPercentRepeats")))
 119             {
 120               percent_counter_
 121                 = make_spanner ("PercentRepeatCounter", percent_event_->self_scm ());
 122
 123               SCM text = scm_number_to_string (count, scm_from_int (10));
 124               percent_counter_->set_property ("text", text);
 125               percent_counter_->set_bound (LEFT, col);
 126               Side_position_interface::add_support (percent_counter_,
 127                                                     percent_);
 128               percent_counter_->set_parent (percent_, Y_AXIS);
 129             }
 130           else
 131             percent_counter_ = 0;
 132         }
 133       else if (repeat_sign_type_ == DOUBLE_MEASURE)
 134         {
 135           Item *double_percent = make_item ("DoublePercentRepeat", percent_event_->self_scm ());
 136
 137           SCM count = percent_event_->get_property ("repeat-count");
 138           if (count != SCM_EOL
 139               && to_boolean (get_property ("countPercentRepeats")))
 140             {
 141               Item *double_percent_counter = make_item ("DoublePercentRepeatCounter",
 142                                                         percent_event_->self_scm());
 143
 144               SCM text = scm_number_to_string (count,
 145                                                scm_from_int (10));
 146               double_percent_counter->set_property ("text", text);
 147
 148               Side_position_interface::add_support (double_percent_counter,
 149                                                     double_percent);
 150               double_percent_counter->set_parent (double_percent, Y_AXIS);
 151               double_percent_counter->set_parent (double_percent, X_AXIS);
 152             }
 153
 154           /* forbid breaks on a % line. Should forbid all breaks, really. */
 155           context ()->get_score_context ()->set_property ("forbidBreak", SCM_BOOL_T);
 156
 157           /* No more processing needed. */
 158           repeat_sign_type_ = UNKNOWN;
 159         }
 160     }
 161 }
 162
 163 void
 164 Percent_repeat_engraver::finalize ()
 165 {
 166   if (percent_)
 167     {
 168       percent_event_->origin ()->warning (_ ("unterminated percent repeat"));
 169       percent_->suicide ();
 170       percent_counter_->suicide();
 171     }
 172 }
 173
 174 void
 175 Percent_repeat_engraver::typeset_perc ()
 176 {
 177   if (percent_)
 178     {
 179       Grob *col = unsmob_grob (get_property ("currentCommandColumn"));
 180
 181       percent_->set_bound (RIGHT, col);
 182       percent_ = 0;
 183
 184       if (percent_counter_)
 185         percent_counter_->set_bound (RIGHT, col);
 186       percent_counter_ = 0;
 187     }
 188 }
 189
 190 void
 191 Percent_repeat_engraver::start_translation_timestep ()
 192 {
 193   if (stop_mom_.main_part_ == now_mom ().main_part_)
 194     {
 195       if (percent_)
 196         typeset_perc ();
 197       percent_event_ = 0;
 198       repeat_sign_type_ = UNKNOWN;
 199     }
 200 }
 201
 202 void
 203 Percent_repeat_engraver::stop_translation_timestep ()
 204 {
 205 }
 206
 207 ADD_TRANSLATOR (Percent_repeat_engraver,
 208                 /* doc */
 209                 "Make whole bar and double bar repeats.",
 210
 211                 /* create */
 212                 "DoublePercentRepeat "
 213                 "DoublePercentRepeatCounter "
 214                 "PercentRepeat "
 215                 "PercentRepeatCounter ",
 216
 217                 /* accept */
 218                 "percent-event ",
 219
 220                 /* read */
 221                 "countPercentRepeats "
 222                 "currentCommandColumn "
 223                 "measureLength ",
 224
 225                 /* write */
 226                 "forbidBreak "
 227                 );