lily/music-sequence.cc

   1 /*
   2   music-sequence.cc --  implement Music_sequence
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include "music-list.hh"
  10 #include "debug.hh"
  11 #include "pitch.hh"
  12
  13
  14 void
  15 Music_sequence::truncate (int k)
  16 {
  17   SCM l = get_mus_property ("elements");
  18   if (k == 0)
  19     {
  20       l = SCM_EOL;
  21     }
  22   else
  23     {
  24       SCM s = l;
  25       k--;
  26       for (; gh_pair_p (s) && k--; s = gh_cdr (s))
  27         ;
  28
  29       if (gh_pair_p (s))
  30         {
  31           gh_set_cdr_x (s, SCM_EOL);
  32         }
  33     }
  34   set_mus_property ("elements", l);
  35 }
  36
  37 SCM
  38 Music_sequence::music_list ()const
  39 {
  40   return get_mus_property ("elements");
  41 }
  42
  43 /*
  44   Ugh this sucks. Linear. do not use.
  45  */
  46 void
  47 Music_sequence::append_music (Music *m)
  48 {
  49   set_mus_property ("elements",
  50                     gh_append2 (music_list (), gh_cons (m->self_scm (), SCM_EOL)));
  51   scm_unprotect_object (m->self_scm ());
  52 }
  53
  54 Music_sequence::Music_sequence (SCM l)
  55   : Music (l)
  56 {
  57 }
  58
  59 void
  60 Music_sequence::transpose (Pitch rq)
  61 {
  62   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
  63     unsmob_music (gh_car (s))->transpose (rq);
  64 }
  65
  66
  67
  68
  69 Moment
  70 Music_sequence::cumulative_length () const
  71 {
  72   Moment cumulative;
  73
  74   Moment last_len ;
  75   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
  76     {
  77       Moment l = unsmob_music (gh_car (s))->length_mom ();
  78       if (last_len.grace_mom_ && l.main_part_)
  79         {
  80           last_len.grace_mom_ = Rational (0);
  81         }
  82       cumulative += last_len;
  83       last_len = l;
  84     }
  85
  86   last_len.grace_mom_ = Rational (0);
  87   cumulative += last_len;
  88
  89   return  cumulative;
  90 }
  91
  92 Pitch
  93 Music_sequence::to_relative_octave (Pitch p)
  94 {
  95   return do_relative_octave (p, false);
  96 }
  97
  98
  99 Moment
 100 Music_sequence::maximum_length () const
 101 {
 102   Moment dur = 0;
 103   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
 104     dur = dur >? unsmob_music (gh_car (s))->length_mom ();
 105
 106   return dur;
 107 }
 108 int
 109 Music_sequence::length_i () const
 110 {
 111   return scm_ilength (music_list ());
 112 }
 113
 114 Pitch
 115 Music_sequence::do_relative_octave (Pitch p, bool ret_first)
 116 {
 117   Pitch retval;
 118   int count=0;
 119
 120   Pitch last = p;
 121   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
 122     {
 123       last = unsmob_music (gh_car (s))->to_relative_octave (last);
 124       if (!count ++)
 125         retval = last;
 126     }
 127
 128   if (!ret_first)
 129     retval = last;
 130
 131   return retval;
 132 }
 133
 134 void
 135 Music_sequence::compress (Moment m)
 136 {
 137   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
 138     unsmob_music (gh_car (s))->compress (m);
 139 }
 140
 141 ADD_MUSIC (Music_sequence);
 142
 143 Music_sequence::Music_sequence ()
 144   : Music (SCM_EOL)
 145 {
 146
 147 }
 148
 149 Moment
 150 Music_sequence::minimum_start () const
 151 {
 152   Moment m;
 153
 154   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
 155     {
 156       m = m <? unsmob_music (gh_car (s))->start_mom ();
 157     }
 158   return m;
 159 }
 160
 161 Moment
 162 Music_sequence::first_start () const
 163 {
 164   Moment m;
 165
 166   for (SCM s = music_list (); gh_pair_p (s);  s = gh_cdr (s))
 167     {
 168       Music * mus = unsmob_music (gh_car (s));
 169       Moment l = mus->length_mom ();
 170
 171       if (l.main_part_)
 172         return mus->start_mom ();
 173       else if (l.grace_mom_)
 174         {
 175           m.grace_mom_ = - l.grace_mom_;
 176           return m;
 177         }
 178     }
 179   return m;
 180 }
 181