lily/paper-column-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "paper-column-engraver.hh"
  21 #include "system.hh"
  22 #include "international.hh"
  23 #include "accidental-placement.hh"
  24 #include "accidental-interface.hh"
  25 #include "axis-group-interface.hh"
  26 #include "context.hh"
  27 #include "note-spacing.hh"
  28 #include "paper-column.hh"
  29 #include "pointer-group-interface.hh"
  30 #include "separation-item.hh"
  31 #include "staff-spacing.hh"
  32 #include "system.hh"
  33 #include "warn.hh"
  34
  35 #include "translator.icc"
  36
  37 Paper_column_engraver::Paper_column_engraver ()
  38 {
  39   last_moment_.main_part_ = Rational (-1,1);
  40   command_column_ = 0;
  41   musical_column_ = 0;
  42   breaks_ = 0;
  43   system_ = 0;
  44   first_ = true;
  45 }
  46
  47 void
  48 Paper_column_engraver::finalize ()
  49 {
  50   if (! (breaks_ % 8))
  51     progress_indication ("[" + to_string (breaks_) + "]");
  52
  53   if (command_column_)
  54     {
  55       if (!scm_is_symbol (command_column_->get_property ("line-break-permission")))
  56         command_column_->set_property ("line-break-permission", ly_symbol2scm ("allow"));
  57       system_->set_bound (RIGHT, command_column_);
  58     }
  59 }
  60
  61 void
  62 Paper_column_engraver::make_columns ()
  63 {
  64   /*
  65     ugh.
  66   */
  67   Paper_column *p1 = make_paper_column ("NonMusicalPaperColumn");
  68   Paper_column *p2 = make_paper_column ("PaperColumn");
  69   /*
  70      The columns are timestamped with now_mom () in
  71      stop_translation_timestep. Cannot happen now, because the
  72      first column is sometimes created before now_mom is initialised.
  73   */
  74
  75   set_columns (p1, p2);
  76 }
  77
  78 void
  79 Paper_column_engraver::initialize ()
  80 {
  81   system_ = dynamic_cast<System *> (unsmob_grob (get_property ("rootSystem")));
  82   make_columns ();
  83
  84   system_->set_bound (LEFT, command_column_);
  85   command_column_->set_property ("line-break-permission", ly_symbol2scm ("allow"));
  86 }
  87
  88 void
  89 Paper_column_engraver::acknowledge_item (Grob_info gi)
  90 {
  91   items_.push_back (gi.item ());
  92 }
  93
  94 void
  95 Paper_column_engraver::acknowledge_staff_spacing (Grob_info gi)
  96 {
  97   Pointer_group_interface::add_grob (command_column_,
  98                                      ly_symbol2scm ("spacing-wishes"),
  99                                      gi.grob ());
 100 }
 101
 102 void
 103 Paper_column_engraver::acknowledge_note_spacing (Grob_info gi)
 104 {
 105   Pointer_group_interface::add_grob (musical_column_,
 106                                      ly_symbol2scm ("spacing-wishes"),
 107                                      gi.grob ());
 108 }
 109
 110 void
 111 Paper_column_engraver::set_columns (Paper_column *new_command,
 112                                     Paper_column *new_musical)
 113 {
 114   command_column_ = new_command;
 115   musical_column_ = new_musical;
 116   if (new_command)
 117     context ()->set_property ("currentCommandColumn", new_command->self_scm ());
 118
 119   if (new_musical)
 120     context ()->set_property ("currentMusicalColumn", new_musical->self_scm ());
 121
 122   system_->add_column (command_column_);
 123   system_->add_column (musical_column_);
 124 }
 125
 126 IMPLEMENT_TRANSLATOR_LISTENER (Paper_column_engraver, break);
 127 void
 128 Paper_column_engraver::listen_break (Stream_event *ev)
 129 {
 130   break_events_.push_back (ev);
 131 }
 132
 133 IMPLEMENT_TRANSLATOR_LISTENER (Paper_column_engraver, label);
 134 void
 135 Paper_column_engraver::listen_label (Stream_event *ev)
 136 {
 137   label_events_.push_back (ev);
 138 }
 139
 140 void
 141 Paper_column_engraver::process_music ()
 142 {
 143   for (vsize i = 0; i < break_events_.size (); i++)
 144     {
 145       string prefix;
 146       SCM name_sym = break_events_[i]->get_property ("class");
 147       string name = ly_scm2string (scm_symbol_to_string (name_sym));
 148       size_t end = name.rfind ("-event");
 149       if (end)
 150         prefix = name.substr (0, end);
 151       else
 152         {
 153           programming_error ("Paper_column_engraver doesn't know about this break-event");
 154           return;
 155         }
 156
 157       string perm_str = prefix + "-permission";
 158       string pen_str = prefix + "-penalty";
 159
 160       SCM cur_pen = command_column_->get_property (pen_str.c_str ());
 161       SCM pen = break_events_[i]->get_property ("break-penalty");
 162       SCM perm = break_events_[i]->get_property ("break-permission");
 163
 164       if (scm_is_number (pen))
 165         {
 166           Real new_pen = robust_scm2double (cur_pen, 0.0) + scm_to_double (pen);
 167           command_column_->set_property (pen_str.c_str (), scm_from_double (new_pen));
 168           command_column_->set_property (perm_str.c_str (), ly_symbol2scm ("allow"));
 169         }
 170       else
 171         command_column_->set_property (perm_str.c_str (), perm);
 172     }
 173
 174   for (vsize i = 0 ; i < label_events_.size () ; i ++)
 175     {
 176       SCM label = label_events_[i]->get_property ("page-label");
 177       SCM labels = command_column_->get_property ("labels");
 178       command_column_->set_property ("labels", scm_cons (label, labels));
 179     }
 180
 181   bool start_of_measure = (last_moment_.main_part_ != now_mom ().main_part_
 182                            && !measure_position (context ()).main_part_);
 183
 184   /*
 185     We can't do this in start_translation_timestep (), since time sig
 186     changes won't have happened by then.
 187   */
 188   if (start_of_measure)
 189     {
 190       Moment mlen = Moment (measure_length (context ()));
 191       Grob *column = unsmob_grob (get_property ("currentCommandColumn"));
 192       if (column)
 193         column->set_property ("measure-length", mlen.smobbed_copy ());
 194       else
 195         programming_error ("No command column?");
 196     }
 197 }
 198
 199 void
 200 Paper_column_engraver::stop_translation_timestep ()
 201 {
 202   SCM m = now_mom ().smobbed_copy ();
 203   command_column_->set_property ("when", m);
 204   musical_column_->set_property ("when", m);
 205
 206   for (vsize i = 0; i < items_.size (); i++)
 207     {
 208       Item *elem = items_[i];
 209       Grob *col = Item::is_non_musical (elem) ? command_column_ : musical_column_;
 210
 211       if (!elem->get_parent (X_AXIS))
 212         elem->set_parent (col, X_AXIS);
 213       if (!unsmob_grob (elem->get_object ("axis-group-parent-X")))
 214         elem->set_object ("axis-group-parent-X", col->self_scm ());
 215
 216       if (Accidental_placement::has_interface (elem))
 217         Separation_item::add_conditional_item (col, elem);
 218       else if (!Accidental_interface::has_interface (elem))
 219         Separation_item::add_item (col, elem);
 220     }
 221   items_.clear ();
 222
 223   if (to_boolean (get_property ("forbidBreak"))
 224      && breaks_) /* don't honour forbidBreak if it occurs on the first moment of a score */
 225     {
 226       command_column_->set_property ("page-turn-permission", SCM_EOL);
 227       command_column_->set_property ("page-break-permission", SCM_EOL);
 228       command_column_->set_property ("line-break-permission", SCM_EOL);
 229       for (vsize i = 0; i < break_events_.size (); i++)
 230         {
 231           SCM perm = break_events_[i]->get_property ("break-permission");
 232           if (perm == ly_symbol2scm ("force") || perm == ly_symbol2scm ("allow"))
 233             warning (_ ("forced break was overridden by some other event, "
 234                         "should you be using bar checks?"));
 235         }
 236     }
 237   else if (Paper_column::is_breakable (command_column_))
 238     {
 239       breaks_++;
 240
 241       if (! (breaks_%8))
 242         progress_indication ("[" + to_string (breaks_) + "]");
 243     }
 244
 245   context ()->get_score_context ()->unset_property (ly_symbol2scm ("forbidBreak"));
 246
 247   first_ = false;
 248   break_events_.clear ();
 249   label_events_.clear ();
 250
 251   SCM mpos = get_property ("measurePosition");
 252   SCM barnum = get_property ("internalBarNumber");
 253   if (unsmob_moment (mpos)
 254       && scm_is_integer (barnum))
 255     {
 256       SCM where = scm_cons (barnum,
 257                             mpos);
 258
 259       command_column_->set_property ("rhythmic-location", where);
 260       musical_column_->set_property ("rhythmic-location", where);
 261     }
 262 }
 263
 264 void
 265 Paper_column_engraver::start_translation_timestep ()
 266 {
 267   /*
 268     TODO: don't make columns when skipTypesetting is true.
 269   */
 270   if (!first_)
 271     make_columns ();
 272 }
 273
 274 ADD_ACKNOWLEDGER (Paper_column_engraver, item);
 275 ADD_ACKNOWLEDGER (Paper_column_engraver, note_spacing);
 276 ADD_ACKNOWLEDGER (Paper_column_engraver, staff_spacing);
 277
 278 ADD_TRANSLATOR (Paper_column_engraver,
 279                 /* doc */
 280                 "Take care of generating columns.\n"
 281                 "\n"
 282                 "This engraver decides whether a column is breakable.  The"
 283                 " default is that a column is always breakable.  However,"
 284                 " every @code{Bar_engraver} that does not have a barline at a"
 285                 " certain point will set @code{forbidBreaks} in the score"
 286                 " context to stop line breaks.  In practice, this means that"
 287                 " you can make a break point by creating a bar line (assuming"
 288                 " that there are no beams or notes that prevent a break"
 289                 " point).",
 290
 291                 /* create */
 292                 "PaperColumn "
 293                 "NonMusicalPaperColumn ",
 294
 295                 /* read */
 296                 "forbidBreak ",
 297
 298                 /* write */
 299                 "forbidBreak "
 300                 "currentCommandColumn "
 301                 "currentMusicalColumn "
 302                 );