lily/script-column.cc

   1 /*
   2   script-column.cc --  implement Script_column
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include "script-column.hh"
  10 #include "side-position-interface.hh"
  11 #include "warn.hh"
  12 #include "group-interface.hh"
  13
  14 void
  15 Script_column::add_staff_sided (Grob *me, Item *i)
  16 {
  17   SCM p = i->get_property ("script-priority");
  18   if (!ly_number_p (p))
  19     return;
  20
  21   Pointer_group_interface::add_grob (me, ly_symbol2scm ("scripts"),i);
  22
  23   me->add_dependency (i);
  24 }
  25
  26 LY_DEFINE (grob_script_priority_less, "ly:grob-script-priority-less",
  27           2, 0, 0, (SCM a, SCM b),
  28           "Compare two grobs by script priority. For internal use.")
  29 {
  30   Grob *i1 = unsmob_grob (a);
  31   Grob *i2 = unsmob_grob (b);
  32
  33   SCM p1 = i1->get_property ("script-priority");
  34   SCM p2 = i2->get_property ("script-priority");
  35
  36   return ly_scm2int (p1) < ly_scm2int (p2) ? SCM_BOOL_T : SCM_BOOL_F;
  37 }
  38
  39 MAKE_SCHEME_CALLBACK (Script_column, before_line_breaking, 1);
  40 SCM
  41 Script_column::before_line_breaking (SCM smob)
  42 {
  43   Grob* me = unsmob_grob (smob);
  44   Drul_array<SCM> scripts (SCM_EOL, SCM_EOL);
  45   Link_array<Grob> staff_sided;
  46
  47   for (SCM s = me->get_property ("scripts"); ly_pair_p (s); s = ly_cdr (s))
  48     {
  49       Grob *sc = unsmob_grob (ly_car (s));
  50
  51       if (!sc->has_offset_callback (Side_position_interface::aligned_side_proc,
  52                                     X_AXIS))
  53         staff_sided.push (sc);
  54     }
  55
  56   for (int i = 0; i < staff_sided.size (); i++)
  57     {
  58       Grob* g = staff_sided[i];
  59       Direction d = Side_position_interface::get_direction (g);
  60       if (!d)
  61         {
  62           programming_error ( "No direction for script?");
  63           d = DOWN;
  64           g->set_property ("direction", scm_int2num (d));
  65         }
  66
  67       scripts[d] = scm_cons (g->self_scm (), scripts[d]);
  68     }
  69
  70   Direction d = DOWN;
  71   do
  72     {
  73       SCM ss = scm_reverse_x (scripts[d], SCM_EOL);
  74       ss = scm_stable_sort_x (ss, grob_script_priority_less_proc);
  75
  76       Grob * last = 0;
  77       for (SCM s = ss; ly_pair_p (s); s = ly_cdr (s))
  78         {
  79           Grob *g = unsmob_grob (ly_car (s));
  80           if (last)
  81             Side_position_interface::add_support (g,last);
  82
  83           last = g;
  84         }
  85
  86     } while (flip (&d) != DOWN);
  87
  88   return SCM_UNSPECIFIED;
  89 }
  90
  91 ADD_INTERFACE (Script_column,"script-column-interface",
  92                "An interface that sorts scripts "
  93                "according to their @code{script-priority}",
  94                "");