lily/system.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2011 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 "system.hh"
  21
  22 #include "align-interface.hh"
  23 #include "all-font-metrics.hh"
  24 #include "axis-group-interface.hh"
  25 #include "grob-array.hh"
  26 #include "hara-kiri-group-spanner.hh"
  27 #include "international.hh"
  28 #include "lookup.hh"
  29 #include "main.hh"
  30 #include "output-def.hh"
  31 #include "page-layout-problem.hh"
  32 #include "paper-column.hh"
  33 #include "paper-score.hh"
  34 #include "paper-system.hh"
  35 #include "pointer-group-interface.hh"
  36 #include "skyline-pair.hh"
  37 #include "staff-symbol-referencer.hh"
  38 #include "warn.hh"
  39
  40 System::System (System const &src)
  41   : Spanner (src)
  42 {
  43   all_elements_ = 0;
  44   pscore_ = 0;
  45   rank_ = 0;
  46   init_elements ();
  47 }
  48
  49 System::System (SCM s)
  50   : Spanner (s)
  51 {
  52   all_elements_ = 0;
  53   rank_ = 0;
  54   init_elements ();
  55 }
  56
  57 void
  58 System::init_elements ()
  59 {
  60   SCM scm_arr = Grob_array::make_array ();
  61   all_elements_ = unsmob_grob_array (scm_arr);
  62   all_elements_->set_ordered (false);
  63   set_object ("all-elements", scm_arr);
  64 }
  65
  66 Grob *
  67 System::clone () const
  68 {
  69   return new System (*this);
  70 }
  71
  72 int
  73 System::element_count () const
  74 {
  75   return all_elements_->size ();
  76 }
  77
  78 int
  79 System::spanner_count () const
  80 {
  81   int k = 0;
  82   for (vsize i = all_elements_->size (); i--;)
  83     if (dynamic_cast<Spanner *> (all_elements_->grob (i)))
  84       k++;
  85   return k;
  86 }
  87
  88 void
  89 System::typeset_grob (Grob *elem)
  90 {
  91   if (elem->layout_)
  92     programming_error ("adding element twice");
  93   else
  94     {
  95       elem->layout_ = pscore_->layout ();
  96       all_elements_->add (elem);
  97       elem->unprotect ();
  98     }
  99 }
 100
 101 void
 102 System::derived_mark () const
 103 {
 104   if (!all_elements_->empty ())
 105     {
 106       Grob **ptr = &all_elements_->array_reference ()[0];
 107       Grob **end = ptr + all_elements_->size ();
 108       while (ptr < end)
 109         {
 110           scm_gc_mark ((*ptr)->self_scm ());
 111           ptr++;
 112         }
 113     }
 114
 115   if (pscore_)
 116     scm_gc_mark (pscore_->self_scm ());
 117
 118   Spanner::derived_mark ();
 119 }
 120
 121 static void
 122 fixup_refpoints (vector<Grob *> const &grobs)
 123 {
 124   for (vsize i = grobs.size (); i--;)
 125     grobs[i]->fixup_refpoint ();
 126 }
 127
 128 void
 129 System::do_break_substitution_and_fixup_refpoints ()
 130 {
 131   for (vsize i = 0; i < all_elements_->size (); i++)
 132     {
 133       Grob *g = all_elements_->grob (i);
 134       if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
 135         {
 136           /*
 137             Kill no longer needed grobs.
 138           */
 139           Item *it = dynamic_cast<Item *> (g);
 140           if (it && Item::is_non_musical (it))
 141             {
 142               it->find_prebroken_piece (LEFT)->suicide ();
 143               it->find_prebroken_piece (RIGHT)->suicide ();
 144             }
 145           g->suicide ();
 146         }
 147       else if (g->is_live ())
 148         g->do_break_processing ();
 149     }
 150
 151   /*
 152     fixups must be done in broken line_of_scores, because new elements
 153     are put over there.  */
 154   int count = 0;
 155   for (vsize i = 0; i < broken_intos_.size (); i++)
 156     {
 157       Grob *se = broken_intos_[i];
 158
 159       extract_grob_set (se, "all-elements", all_elts);
 160       for (vsize j = 0; j < all_elts.size (); j++)
 161         {
 162           Grob *g = all_elts[j];
 163           g->fixup_refpoint ();
 164         }
 165
 166       count += all_elts.size ();
 167     }
 168
 169   /*
 170     needed for doing items.
 171   */
 172   fixup_refpoints (all_elements_->array ());
 173
 174   for (vsize i = 0; i < all_elements_->size (); i++)
 175     all_elements_->grob (i)->handle_broken_dependencies ();
 176
 177   handle_broken_dependencies ();
 178
 179   /* Because the this->get_property (all-elements) contains items in 3
 180      versions, handle_broken_dependencies () will leave duplicated
 181      items in all-elements.  Strictly speaking this is harmless, but
 182      it leads to duplicated symbols in the output.  uniq makes sure
 183      that no duplicates are in the list.  */
 184   for (vsize i = 0; i < broken_intos_.size (); i++)
 185     {
 186       System *child = dynamic_cast<System *> (broken_intos_[i]);
 187       child->all_elements_->remove_duplicates ();
 188       for (vsize j = 0; j < child->all_elements_->size (); j++)
 189         {
 190           Grob *g = child->all_elements_->grob (j);
 191
 192           (void) g->get_property ("after-line-breaking");
 193         }
 194     }
 195
 196   if (be_verbose_global)
 197     message (_f ("Element count %d", count + element_count ()) + "\n");
 198 }
 199
 200 SCM
 201 System::get_broken_system_grobs ()
 202 {
 203   SCM ret = SCM_EOL;
 204   for (vsize i = 0; i < broken_intos_.size (); i++)
 205     ret = scm_cons (broken_intos_[i]->self_scm (), ret);
 206   return scm_reverse (ret);
 207 }
 208
 209 SCM
 210 System::get_paper_systems ()
 211 {
 212   SCM lines = scm_c_make_vector (broken_intos_.size (), SCM_EOL);
 213   for (vsize i = 0; i < broken_intos_.size (); i++)
 214     {
 215       if (be_verbose_global)
 216         progress_indication ("[");
 217
 218       System *system = dynamic_cast<System *> (broken_intos_[i]);
 219
 220       scm_vector_set_x (lines, scm_from_int (i),
 221                         system->get_paper_system ());
 222
 223       if (be_verbose_global)
 224         progress_indication (to_string (i) + "]");
 225     }
 226   return lines;
 227 }
 228
 229 void
 230 System::break_into_pieces (vector<Column_x_positions> const &breaking)
 231 {
 232   for (vsize i = 0; i < breaking.size (); i++)
 233     {
 234       System *system = dynamic_cast<System *> (clone ());
 235       system->rank_ = broken_intos_.size ();
 236
 237       vector<Grob *> c (breaking[i].cols_);
 238       pscore_->typeset_system (system);
 239
 240       int st = Paper_column::get_rank (c[0]);
 241       int end = Paper_column::get_rank (c.back ());
 242       Interval iv (pure_height (this, st, end));
 243       system->set_property ("pure-Y-extent", ly_interval2scm (iv));
 244
 245       system->set_bound (LEFT, c[0]);
 246       system->set_bound (RIGHT, c.back ());
 247       SCM system_labels = SCM_EOL;
 248       for (vsize j = 0; j < c.size (); j++)
 249         {
 250           c[j]->translate_axis (breaking[i].config_[j], X_AXIS);
 251           dynamic_cast<Paper_column *> (c[j])->set_system (system);
 252           /* collect the column labels */
 253           collect_labels (c[j], &system_labels);
 254         }
 255       /*
 256         Collect labels from any loose columns too: theses will be set on
 257         an empty bar line or a column which is otherwise unused mid-line
 258       */
 259       vector<Grob *> loose (breaking[i].loose_cols_);
 260       for (vsize j = 0; j < loose.size (); j++)
 261         collect_labels (loose[j], &system_labels);
 262
 263       system->set_property ("labels", system_labels);
 264
 265       set_loose_columns (system, &breaking[i]);
 266       broken_intos_.push_back (system);
 267     }
 268 }
 269
 270 void
 271 System::collect_labels (Grob const *col, SCM *labels)
 272 {
 273   SCM col_labels = col->get_property ("labels");
 274   if (scm_is_pair (col_labels))
 275     *labels = scm_append (scm_list_2 (col_labels, *labels));
 276 }
 277
 278 void
 279 System::add_column (Paper_column *p)
 280 {
 281   Grob *me = this;
 282   Grob_array *ga = unsmob_grob_array (me->get_object ("columns"));
 283   if (!ga)
 284     {
 285       SCM scm_ga = Grob_array::make_array ();
 286       me->set_object ("columns", scm_ga);
 287       ga = unsmob_grob_array (scm_ga);
 288     }
 289
 290   p->set_rank (ga->size ());
 291
 292   ga->add (p);
 293   Axis_group_interface::add_element (this, p);
 294 }
 295
 296 void
 297 System::pre_processing ()
 298 {
 299   for (vsize i = 0; i < all_elements_->size (); i++)
 300     all_elements_->grob (i)->discretionary_processing ();
 301
 302   if (be_verbose_global)
 303     message (_f ("Grob count %d", element_count ()));
 304
 305   /*
 306     order is significant: broken grobs are added to the end of the
 307     array, and should be processed before the original is potentially
 308     killed.
 309   */
 310   for (vsize i = all_elements_->size (); i--;)
 311     all_elements_->grob (i)->handle_prebroken_dependencies ();
 312
 313   fixup_refpoints (all_elements_->array ());
 314
 315   for (vsize i = 0; i < all_elements_->size (); i++)
 316     {
 317       Grob *g = all_elements_->grob (i);
 318       (void) g->get_property ("before-line-breaking");
 319     }
 320
 321   for (vsize i = 0; i < all_elements_->size (); i++)
 322     {
 323       Grob *e = all_elements_->grob (i);
 324       (void) e->get_property ("springs-and-rods");
 325     }
 326 }
 327
 328 void
 329 System::post_processing ()
 330 {
 331   Interval iv (extent (this, Y_AXIS));
 332   if (iv.is_empty ())
 333     programming_error ("system with empty extent");
 334   else
 335     translate_axis (-iv[MAX], Y_AXIS);
 336
 337   /* Generate all stencils to trigger font loads.
 338      This might seem inefficient, but Stencils are cached per grob
 339      anyway. */
 340
 341   vector<Grob *> all_elts_sorted (all_elements_->array ());
 342   vector_sort (all_elts_sorted, std::less<Grob *> ());
 343   uniq (all_elts_sorted);
 344   this->get_stencil ();
 345   for (vsize i = all_elts_sorted.size (); i--;)
 346     {
 347       Grob *g = all_elts_sorted[i];
 348       g->get_stencil ();
 349     }
 350 }
 351
 352 struct Layer_entry
 353 {
 354   Grob *grob_;
 355   int layer_;
 356 };
 357
 358 bool
 359 operator< (Layer_entry  const &a,
 360            Layer_entry  const &b)
 361 {
 362   return a.layer_ < b.layer_;
 363 }
 364
 365 SCM
 366 System::get_paper_system ()
 367 {
 368   SCM exprs = SCM_EOL;
 369   SCM *tail = &exprs;
 370
 371   post_processing ();
 372
 373   vector<Layer_entry> entries;
 374   for (vsize j = 0; j < all_elements_->size (); j++)
 375     {
 376       Layer_entry e;
 377       e.grob_ = all_elements_->grob (j);
 378       e.layer_ = robust_scm2int (e.grob_->get_property ("layer"), 1);
 379
 380       entries.push_back (e);
 381     }
 382
 383   vector_sort (entries, std::less<Layer_entry> ());
 384   for (vsize j = 0; j < entries.size (); j++)
 385     {
 386       Grob *g = entries[j].grob_;
 387       Stencil st = g->get_print_stencil ();
 388
 389       if (st.expr () == SCM_EOL)
 390         continue;
 391
 392       Offset o;
 393       for (int a = X_AXIS; a < NO_AXES; a++)
 394         o[Axis (a)] = g->relative_coordinate (this, Axis (a));
 395
 396       Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
 397                                         Offset (0, 0))
 398         * Staff_symbol_referencer::staff_space (g);
 399
 400       /* Must copy the stencil, for we cannot change the stencil
 401          cached in G.  */
 402
 403       st.translate (o + extra);
 404
 405       *tail = scm_cons (st.expr (), SCM_EOL);
 406       tail = SCM_CDRLOC (*tail);
 407     }
 408
 409   if (Stencil *me = get_stencil ())
 410     exprs = scm_cons (me->expr (), exprs);
 411
 412   Interval x (extent (this, X_AXIS));
 413   Interval y (extent (this, Y_AXIS));
 414   Stencil sys_stencil (Box (x, y),
 415                        scm_cons (ly_symbol2scm ("combine-stencil"),
 416                                  exprs));
 417   if (debug_skylines)
 418     {
 419       Skyline_pair *skylines = Skyline_pair::unsmob (get_property ("vertical-skylines"));
 420       if (skylines)
 421         {
 422           Stencil up
 423             = Lookup::points_to_line_stencil (0.1, (*skylines)[UP].to_points (X_AXIS));
 424           Stencil down
 425             = Lookup::points_to_line_stencil (0.1, (*skylines)[DOWN].to_points (X_AXIS));
 426           sys_stencil.add_stencil (up.in_color (255, 0, 0));
 427           sys_stencil.add_stencil (down.in_color (0, 255, 0));
 428         }
 429     }
 430
 431   Grob *left_bound = this->get_bound (LEFT);
 432   SCM prop_init = left_bound->get_property ("line-break-system-details");
 433   Prob *pl = make_paper_system (prop_init);
 434   paper_system_set_stencil (pl, sys_stencil);
 435
 436   /* information that the page breaker might need */
 437   Grob *right_bound = this->get_bound (RIGHT);
 438   pl->set_property ("vertical-skylines", this->get_property ("vertical-skylines"));
 439   pl->set_property ("page-break-permission", right_bound->get_property ("page-break-permission"));
 440   pl->set_property ("page-turn-permission", right_bound->get_property ("page-turn-permission"));
 441   pl->set_property ("page-break-penalty", right_bound->get_property ("page-break-penalty"));
 442   pl->set_property ("page-turn-penalty", right_bound->get_property ("page-turn-penalty"));
 443
 444   Interval staff_refpoints;
 445   if (Grob *align = get_vertical_alignment ())
 446     {
 447       extract_grob_set (align, "elements", staves);
 448       for (vsize i = 0; i < staves.size (); i++)
 449         if (staves[i]->is_live ()
 450             && Page_layout_problem::is_spaceable (staves[i]))
 451           staff_refpoints.add_point (staves[i]->relative_coordinate (this,
 452                                                                      Y_AXIS));
 453     }
 454
 455   pl->set_property ("staff-refpoint-extent", ly_interval2scm (staff_refpoints));
 456   pl->set_property ("system-grob", this->self_scm ());
 457
 458   return pl->unprotect ();
 459 }
 460
 461 vector<Item *>
 462 System::broken_col_range (Item const *left, Item const *right) const
 463 {
 464   vector<Item *> ret;
 465
 466   left = left->get_column ();
 467   right = right->get_column ();
 468
 469   extract_grob_set (this, "columns", cols);
 470
 471   vsize i = Paper_column::get_rank (left);
 472   int end_rank = Paper_column::get_rank (right);
 473   if (i < cols.size ())
 474     i++;
 475
 476   while (i < cols.size ()
 477          && Paper_column::get_rank (cols[i]) < end_rank)
 478     {
 479       Paper_column *c = dynamic_cast<Paper_column *> (cols[i]);
 480       if (Paper_column::is_breakable (c) && !c->get_system ())
 481         ret.push_back (c);
 482       i++;
 483     }
 484
 485   return ret;
 486 }
 487
 488 /** Return all columns, but filter out any unused columns , since they might
 489     disrupt the spacing problem. */
 490 vector<Grob *>
 491 System::used_columns () const
 492 {
 493   extract_grob_set (this, "columns", ro_columns);
 494
 495   int last_breakable = ro_columns.size ();
 496
 497   while (last_breakable--)
 498     {
 499       if (Paper_column::is_breakable (ro_columns [last_breakable]))
 500         break;
 501     }
 502
 503   vector<Grob *> columns;
 504   for (int i = 0; i <= last_breakable; i++)
 505     {
 506       if (Paper_column::is_used (ro_columns[i]))
 507         columns.push_back (ro_columns[i]);
 508     }
 509
 510   return columns;
 511 }
 512
 513 Paper_column *
 514 System::column (vsize which) const
 515 {
 516   extract_grob_set (this, "columns", columns);
 517   if (which >= columns.size ())
 518     return 0;
 519
 520   return dynamic_cast<Paper_column *> (columns[which]);
 521 }
 522
 523 Paper_score *
 524 System::paper_score () const
 525 {
 526   return pscore_;
 527 }
 528
 529 int
 530 System::get_rank () const
 531 {
 532   return rank_;
 533 }
 534
 535 System *
 536 get_root_system (Grob *me)
 537 {
 538   Grob *system_grob = me;
 539
 540   while (system_grob->get_parent (Y_AXIS))
 541     system_grob = system_grob->get_parent (Y_AXIS);
 542
 543   return dynamic_cast<System *> (system_grob);
 544 }
 545
 546 Grob *
 547 System::get_vertical_alignment ()
 548 {
 549   extract_grob_set (this, "elements", elts);
 550   Grob *ret = 0;
 551   for (vsize i = 0; i < elts.size (); i++)
 552     if (Align_interface::has_interface (elts[i]))
 553       {
 554         if (ret)
 555           programming_error ("found multiple vertical alignments in this system");
 556         ret = elts[i];
 557       }
 558
 559   if (!ret)
 560     programming_error ("didn't find a vertical alignment in this system");
 561   return ret;
 562 }
 563
 564 // Finds the furthest staff in the given direction whose x-extent
 565 // overlaps with the given interval.
 566 Grob *
 567 System::get_extremal_staff (Direction dir, Interval const &iv)
 568 {
 569   Grob *align = get_vertical_alignment ();
 570   if (!align)
 571     return 0;
 572
 573   extract_grob_set (align, "elements", elts);
 574   vsize start = (dir == UP) ? 0 : elts.size () - 1;
 575   vsize end = (dir == UP) ? elts.size () : VPOS;
 576   for (vsize i = start; i != end; i += dir)
 577     {
 578       if (Hara_kiri_group_spanner::has_interface (elts[i]))
 579         Hara_kiri_group_spanner::consider_suicide (elts[i]);
 580
 581       Interval intersection = elts[i]->extent (this, X_AXIS);
 582       intersection.intersect (iv);
 583       if (elts[i]->is_live () && !intersection.is_empty ())
 584         return elts[i];
 585     }
 586   return 0;
 587 }
 588
 589 Interval
 590 System::pure_refpoint_extent (vsize start, vsize end)
 591 {
 592   Interval ret;
 593   Grob *alignment = get_vertical_alignment ();
 594   if (!alignment)
 595     return Interval ();
 596
 597   extract_grob_set (alignment, "elements", staves);
 598   vector<Real> offsets = Align_interface::get_pure_minimum_translations (alignment, staves, Y_AXIS, start, end);
 599
 600   for (vsize i = 0; i < offsets.size (); ++i)
 601     if (Page_layout_problem::is_spaceable (staves[i]))
 602       {
 603         ret[UP] = offsets[i];
 604         break;
 605       }
 606
 607   for (vsize i = offsets.size (); i--;)
 608     if (Page_layout_problem::is_spaceable (staves[i]))
 609       {
 610         ret[DOWN] = offsets[i];
 611         break;
 612       }
 613
 614   return ret;
 615 }
 616
 617 Interval
 618 System::part_of_line_pure_height (vsize start, vsize end, bool begin)
 619 {
 620   Grob *alignment = get_vertical_alignment ();
 621   if (!alignment)
 622     return Interval ();
 623
 624   extract_grob_set (alignment, "elements", staves);
 625   vector<Real> offsets = Align_interface::get_pure_minimum_translations (alignment, staves, Y_AXIS, start, end);
 626
 627   Interval ret;
 628   for (vsize i = 0; i < staves.size (); ++i)
 629     {
 630       Interval iv = begin
 631         ? Axis_group_interface::begin_of_line_pure_height (staves[i], start)
 632         : Axis_group_interface::rest_of_line_pure_height (staves[i], start, end);
 633       if (i < offsets.size ())
 634         iv.translate (offsets[i]);
 635       ret.unite (iv);
 636     }
 637
 638   Interval other_elements = begin
 639     ? Axis_group_interface::begin_of_line_pure_height (this, start)
 640     : Axis_group_interface::rest_of_line_pure_height (this, start, end);
 641
 642   ret.unite (other_elements);
 643
 644   return ret;
 645 }
 646
 647 Interval
 648 System::begin_of_line_pure_height (vsize start, vsize end)
 649 {
 650   return part_of_line_pure_height (start, end, true);
 651 }
 652
 653 Interval
 654 System::rest_of_line_pure_height (vsize start, vsize end)
 655 {
 656   return part_of_line_pure_height (start, end, false);
 657 }
 658
 659 // This differs from Axis_group_interface::calc_pure_relevant_grobs
 660 // because here, we are only interested in those few elements that aren't
 661 // descended from VerticalAlignment (ie. things like RehearsalMark, BarLine).
 662 MAKE_SCHEME_CALLBACK (System, calc_pure_relevant_grobs, 1);
 663 SCM
 664 System::calc_pure_relevant_grobs (SCM smob)
 665 {
 666   Grob *me = unsmob_grob (smob);
 667
 668   extract_grob_set (me, "elements", elts);
 669   vector<Grob *> relevant_grobs;
 670   SCM pure_relevant_p = ly_lily_module_constant ("pure-relevant?");
 671
 672   for (vsize i = 0; i < elts.size (); ++i)
 673     {
 674       if (!Axis_group_interface::has_interface (elts[i]))
 675         {
 676           if (to_boolean (scm_apply_1 (pure_relevant_p, elts[i]->self_scm (), SCM_EOL)))
 677             relevant_grobs.push_back (elts[i]);
 678
 679           if (Item *it = dynamic_cast<Item*> (elts[i]))
 680             {
 681               Direction d = LEFT;
 682               do
 683                 {
 684                   Item *piece = it->find_prebroken_piece (d);
 685                   if (piece && to_boolean (scm_apply_1 (pure_relevant_p, piece->self_scm (), SCM_EOL)))
 686                     relevant_grobs.push_back (piece);
 687                 }
 688               while (flip (&d) != LEFT);
 689             }
 690         }
 691     }
 692
 693   SCM grobs_scm = Grob_array::make_array ();
 694
 695   unsmob_grob_array (grobs_scm)->set_array (relevant_grobs);
 696   return grobs_scm;
 697 }
 698
 699 MAKE_SCHEME_CALLBACK (System, height, 1);
 700 SCM
 701 System::height (SCM smob)
 702 {
 703   return Axis_group_interface::height (smob);
 704 }
 705
 706 MAKE_SCHEME_CALLBACK (System, calc_pure_height, 3);
 707 SCM
 708 System::calc_pure_height (SCM smob, SCM start_scm, SCM end_scm)
 709 {
 710   System *me = dynamic_cast<System *> (unsmob_grob (smob));
 711   int start = scm_to_int (start_scm);
 712   int end = scm_to_int (end_scm);
 713
 714   Interval begin = me->begin_of_line_pure_height (start, end);
 715   Interval rest = me->rest_of_line_pure_height (start, end);
 716   begin.unite (rest);
 717
 718   return ly_interval2scm (begin);
 719 }
 720
 721 Grob*
 722 System::get_pure_bound (Direction d, int start, int end)
 723 {
 724   vector<vsize> ranks = pscore_->get_break_ranks ();
 725   vector<vsize> indices = pscore_->get_break_indices ();
 726   vector<Grob*> cols = pscore_->get_columns ();
 727
 728   vsize target_rank = (d == LEFT ? start : end);
 729   vector<vsize>::const_iterator i =
 730     lower_bound (ranks.begin (), ranks.end (), target_rank, std::less<vsize> ());
 731
 732   if (i != ranks.end () && (*i) == target_rank)
 733     return cols[indices[i - ranks.begin ()]];
 734   else
 735     return 0;
 736 }
 737
 738 Grob*
 739 System::get_maybe_pure_bound (Direction d, bool pure, int start, int end)
 740 {
 741   return pure ? get_pure_bound (d, start, end) : get_bound (d);
 742 }
 743
 744 ADD_INTERFACE (System,
 745                "This is the top-level object: Each object in a score"
 746                " ultimately has a @code{System} object as its X and"
 747                " Y@tie{}parent.",
 748
 749                /* properties */
 750                "all-elements "
 751                "columns "
 752                "labels "
 753                "pure-Y-extent "
 754                "skyline-horizontal-padding "
 755                );