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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "repeated-music.hh"
  12 #include "engraver-group-engraver.hh"
  13 #include "global-context.hh"
  14 #include "warn.hh"
  15 #include "misc.hh"
  16 #include "spanner.hh"
  17 #include "item.hh"
  18 #include "percent-repeat-iterator.hh"
  19 #include "bar-line.hh"
  20
  21 #include "score-engraver.hh"
  22 #include "context.hh"
  23
  24
  25 /**
  26   This acknowledges repeated music with "percent" style.  It typesets
  27   a % sign.
  28
  29   TODO:
  30
  31   - BEAT case: Create items for single beat repeats, i.e. c4 / / /
  32
  33   - DOUBLE_MEASURE case: attach a % to an appropriate barline.
  34
  35 */
  36 class Percent_repeat_engraver : public Engraver
  37 {
  38   void typeset_perc ();
  39 public:
  40   TRANSLATOR_DECLARATIONS (Percent_repeat_engraver);
  41 protected:
  42   Repeated_music * repeat_;
  43
  44   /// moment (global time) where beam started.
  45   Moment start_mom_;
  46   Moment stop_mom_;
  47
  48   /// location  within measure where beam started.
  49   Moment beam_start_location_;
  50   Moment next_moment_;
  51   Moment body_length_;
  52
  53   enum {
  54     UNKNOWN,
  55     MEASURE,
  56     DOUBLE_MEASURE,
  57   } repeat_sign_type_ ;
  58
  59   Item * double_percent_;
  60   Spanner * perc_;
  61   Spanner * finished_perc_;
  62 protected:
  63   virtual void finalize ();
  64   virtual bool try_music (Music*);
  65   virtual void stop_translation_timestep ();
  66   virtual void start_translation_timestep ();
  67   virtual void process_music ();
  68 };
  69
  70 Percent_repeat_engraver::Percent_repeat_engraver ()
  71 {
  72   perc_  = 0;
  73   finished_perc_ = 0;
  74   repeat_ =0;
  75
  76   double_percent_ = 0;
  77 }
  78
  79 bool
  80 Percent_repeat_engraver::try_music (Music * m)
  81 {
  82   Repeated_music * rp = dynamic_cast<Repeated_music*> (m);
  83   if (rp
  84       && rp->get_property ("iterator-ctor")
  85          == Percent_repeat_iterator::constructor_proc
  86       && !repeat_)
  87     {
  88       body_length_ = rp->body_get_length ();
  89       int count =   rp->repeat_count ();
  90
  91       Moment now = now_mom ();
  92       start_mom_ = now;
  93       stop_mom_ = start_mom_ + Moment (count) * body_length_;
  94       next_moment_ = start_mom_ + body_length_;
  95
  96       SCM m = get_property ("measureLength");
  97       Moment meas_len;
  98       if (unsmob_moment (m))
  99         meas_len = *unsmob_moment (m);
 100
 101       if (meas_len == body_length_)
 102         repeat_sign_type_ = MEASURE;
 103       else if (Moment (2)* meas_len == body_length_)
 104         {
 105           repeat_sign_type_ = DOUBLE_MEASURE;
 106           next_moment_ += meas_len ;
 107         }
 108       else
 109         {
 110           warning (_ ("Don't know how to handle a percent repeat of this length."));
 111           return false;
 112         }
 113
 114       repeat_ = rp;
 115
 116
 117       Global_context *global = get_global_context ();
 118       for (int i = 0; i < count; i++)
 119         global->add_moment_to_process (next_moment_ + Moment (i) * body_length_);
 120
 121       return true;
 122     }
 123
 124   return false;
 125 }
 126
 127 void
 128 Percent_repeat_engraver::process_music ()
 129 {
 130   if (repeat_ && now_mom () == next_moment_)
 131     {
 132       if (repeat_sign_type_ == MEASURE)
 133         {
 134           finished_perc_ = perc_;
 135           typeset_perc ();
 136           perc_ = make_spanner ("PercentRepeat");
 137           SCM col =get_property ("currentCommandColumn");
 138           perc_->set_bound (LEFT, unsmob_grob (col));
 139           announce_grob (perc_, repeat_->self_scm ());
 140         }
 141       else if (repeat_sign_type_ == DOUBLE_MEASURE)
 142         {
 143           double_percent_ = make_item ("DoublePercentRepeat");
 144           announce_grob (double_percent_, repeat_->self_scm ());
 145
 146       /*
 147         forbid breaks on a % line. Should forbid all breaks, really.
 148        */
 149
 150           get_score_engraver ()->forbid_breaks ();      // guh. Use properties!
 151         }
 152       next_moment_ = next_moment_ + body_length_;
 153
 154       get_global_context ()->add_moment_to_process (next_moment_);
 155     }
 156 }
 157
 158 void
 159 Percent_repeat_engraver::finalize ()
 160 {
 161   typeset_perc ();
 162   if (perc_)
 163     {
 164       repeat_->origin ()->warning (_ ("unterminated percent repeat"));
 165       perc_->suicide ();
 166     }
 167 }
 168
 169 void
 170 Percent_repeat_engraver::typeset_perc ()
 171 {
 172   if (finished_perc_)
 173     {
 174       SCM col =get_property ("currentCommandColumn");
 175       finished_perc_->set_bound (RIGHT, unsmob_grob (col));
 176       typeset_grob (finished_perc_);
 177       finished_perc_ = 0;
 178     }
 179
 180   if (double_percent_)
 181     {
 182       typeset_grob (double_percent_);
 183       double_percent_ = 0;
 184     }
 185 }
 186
 187
 188
 189
 190 void
 191 Percent_repeat_engraver::start_translation_timestep ()
 192 {
 193   if (stop_mom_ == now_mom ())
 194     {
 195       if (perc_)
 196         {
 197           finished_perc_ = perc_;
 198           typeset_perc ();
 199         }
 200       repeat_ = 0;
 201       perc_ = 0;
 202       repeat_sign_type_ = UNKNOWN;
 203     }
 204 }
 205
 206
 207 void
 208 Percent_repeat_engraver::stop_translation_timestep ()
 209 {
 210   typeset_perc ();
 211 }
 212
 213
 214
 215
 216 ENTER_DESCRIPTION (Percent_repeat_engraver,
 217 /* descr */       "Make whole bar and double bar repeats.",
 218 /* creats*/       "PercentRepeat DoublePercentRepeat",
 219 /* accepts */     "repeated-music",
 220 /* acks  */      "",
 221 /* reads */       "measureLength currentCommandColumn",
 222 /* write */       "");