lily/part-combine-music-iterator.cc

   1 /*
   2   part-combine-music-iterator.cc -- implement  Part_combine_music_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "part-combine-music.hh"
  10 #include "part-combine-music-iterator.hh"
  11 #include "translator-group.hh"
  12 #include "musical-request.hh"
  13 #include "warn.hh"
  14
  15 Part_combine_music_iterator::Part_combine_music_iterator ()
  16 {
  17   combined_b_ = false;
  18
  19   first_iter_p_ = 0;
  20   second_iter_p_ = 0;
  21 }
  22
  23 Part_combine_music_iterator::~Part_combine_music_iterator ()
  24 {
  25   delete second_iter_p_;
  26   delete first_iter_p_;
  27 }
  28
  29 Moment
  30 Part_combine_music_iterator::next_moment () const
  31 {
  32   Moment first_next = first_iter_p_->next_moment ();
  33   Moment second_next = second_iter_p_->next_moment ();
  34   return first_next <? second_next;
  35 }
  36
  37 bool
  38 Part_combine_music_iterator::ok () const
  39 {
  40   //hmm
  41   return first_iter_p_->ok ();
  42 }
  43
  44 void
  45 Part_combine_music_iterator::do_print () const
  46 {
  47   first_iter_p_->print ();
  48   second_iter_p_->print ();
  49 }
  50
  51 void
  52 Part_combine_music_iterator::construct_children ()
  53 {
  54   Part_combine_music const * m = dynamic_cast<Part_combine_music const*> (music_l_);
  55
  56   first_iter_p_ = get_iterator_p (m->first_l ());
  57   second_iter_p_ = get_iterator_p (m->second_l ());
  58 }
  59
  60 void
  61 Part_combine_music_iterator::change_to (Music_iterator *it, String to_type,
  62                                         String to_id)
  63 {
  64   Translator_group * current = it->report_to_l ();
  65   Translator_group * last = 0;
  66
  67   /*
  68     Cut & Paste from from Auto_change_iterator from Change_iterator (ugh).
  69
  70     TODO: abstract this function
  71    */
  72
  73   /* find the type  of translator that we're changing.
  74
  75      If \translator Staff = bass, then look for Staff = *
  76    */
  77   while  (current && current->type_str_ != to_type)
  78     {
  79       last = current;
  80       current = current->daddy_trans_l_;
  81     }
  82
  83   if (current && current->id_str_ == to_id)
  84     {
  85       String msg;
  86       msg += _ ("Can't switch translators, I'm there already");
  87     }
  88
  89   if (current)
  90     if (last)
  91       {
  92         Translator_group * dest =
  93           it->report_to_l ()->find_create_translator_l (to_type, to_id);
  94         current->remove_translator_p (last);
  95         dest->add_translator (last);
  96       }
  97     else
  98       {
  99         /*
 100           We could change the current translator's id, but that would make
 101           errors hard to catch
 102
 103            last->translator_id_str_  = change_l ()->change_to_id_str_;
 104         */
 105         error (_f ("I'm one myself: `%s'", to_type.ch_C ()));
 106       }
 107   else
 108     error (_f ("none of these in my family: `%s'", to_id.ch_C ()));
 109 }
 110
 111 Pitch_interrogate_req* first_spanish_inquisition; // nobody expects it
 112 Pitch_interrogate_req* second_spanish_inquisition; // won't strike twice
 113
 114 void
 115 Part_combine_music_iterator::do_process_and_next (Moment m)
 116 {
 117   Moment first_next = first_iter_p_->next_moment ();
 118   Moment second_next = second_iter_p_->next_moment ();
 119
 120   bool changed_b = false;
 121   Part_combine_music const * p = dynamic_cast<Part_combine_music const* > (music_l_);
 122
 123   String to_id =  combined_b_ ? "first" : "second";
 124   /*
 125     different rhythm for combined voices: separate
 126     same rhythm for separated voices: combine
 127   */
 128   if ((first_next != second_next && combined_b_)
 129       || (first_next == second_next && !combined_b_))
 130     {
 131       combined_b_ = !combined_b_;
 132       to_id =  combined_b_ ? "first" : "second";
 133       change_to (second_iter_p_, p->what_str_, to_id);
 134       changed_b = true;
 135     }
 136
 137   Translator_group * fd =
 138     first_iter_p_->report_to_l ()->find_create_translator_l (p->what_str_,
 139                                                              "first");
 140   Translator_group * sd =
 141     second_iter_p_->report_to_l ()->find_create_translator_l (p->what_str_,
 142                                                               to_id);
 143
 144   fd->set_property ("first", SCM_BOOL_T);
 145   if (!combined_b_)
 146     sd->set_property ("second", SCM_BOOL_T);
 147
 148   if (first_next <= m)
 149     first_iter_p_->process_and_next (m);
 150
 151   if (second_next <= m)
 152     second_iter_p_->process_and_next (m);
 153
 154   Music_iterator::do_process_and_next (m);
 155
 156   /*
 157     TODO:
 158
 159     * when combining two threads: check pitches, request stem directions
 160
 161     * a2-engraver to put texts a2/Solo/SoloII as appropriate.
 162
 163     * maybe the a2-engraver should set the stem directions, iso us?
 164
 165
 166     Maybe different modes exist?
 167
 168     * Wind instruments (Flute I/II)
 169     * Hymnals:
 170
 171
 172       Rules for Hymnals/SATB (John Henckel <henckel@iname.com>):
 173
 174       1. if S and A differ by less than a third, the stems should be up/down.
 175       2. else if S and A have different values, the stems should be up/down.
 176       3. else if A sings "la" or higher, both S and A stems should be down.
 177       4. else both stems should be up
 178
 179     * This may get really tricky: combining voices/staffs: string instruments
 180
 181    */
 182
 183   if (!first_spanish_inquisition)
 184     first_spanish_inquisition = new Pitch_interrogate_req;
 185   Music_iterator* fit = first_iter_p_->try_music (first_spanish_inquisition);
 186
 187   if (!second_spanish_inquisition)
 188     second_spanish_inquisition = new Pitch_interrogate_req;
 189   Music_iterator* sit = second_iter_p_->try_music (second_spanish_inquisition);
 190
 191   /*
 192     Hmm.  In the case of a2, the second identical set of requests must
 193     be junked: that's the whole point of detecting a2.  Howto/whereto
 194     junk these requests?
 195    */
 196   if (changed_b
 197       && (first_next == second_next)
 198       && first_spanish_inquisition->pitch_arr_.size ()
 199       && (first_spanish_inquisition->pitch_arr_.size ()
 200           == second_spanish_inquisition->pitch_arr_.size ())
 201       && (first_spanish_inquisition->pitch_arr_[0] ==
 202           second_spanish_inquisition->pitch_arr_[0]))
 203     {
 204       fd->set_property ("a2", SCM_BOOL_T);
 205       sd->set_property ("a2", SCM_BOOL_T);
 206     }
 207
 208   if (changed_b
 209       && first_spanish_inquisition->pitch_arr_.size ()
 210       && !second_spanish_inquisition->pitch_arr_.size ())
 211     {
 212       fd->set_property ("solo", SCM_BOOL_T);
 213     }
 214
 215   if (changed_b
 216       && !first_spanish_inquisition->pitch_arr_.size ()
 217       && second_spanish_inquisition->pitch_arr_.size ())
 218     {
 219       sd->set_property ("solo2", SCM_BOOL_T);
 220     }
 221
 222   first_spanish_inquisition->pitch_arr_.clear ();
 223   second_spanish_inquisition->pitch_arr_.clear ();
 224 }
 225
 226 Music_iterator*
 227 Part_combine_music_iterator::try_music_in_children (Music *m) const
 228 {
 229   Music_iterator * i =  first_iter_p_->try_music (m);
 230   if (i)
 231     return i;
 232   else
 233     return second_iter_p_->try_music (m);
 234 }
 235