lily/global-context.cc

   1 /*
   2   global-context.cc -- implement Global_context
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "global-context.hh"
  10
  11 #include <cstdio>
  12 using namespace std;
  13
  14 #include "context-def.hh"
  15 #include "dispatcher.hh"
  16 #include "international.hh"
  17 #include "music-iterator.hh"
  18 #include "music.hh"
  19 #include "output-def.hh"
  20 #include "warn.hh"
  21
  22 Global_context::Global_context (Output_def *o)
  23   : Context ()
  24 {
  25   output_def_ = o;
  26   definition_ = find_context_def (o, ly_symbol2scm ("Global"));
  27
  28   now_mom_.set_infinite (-1);
  29   prev_mom_.set_infinite (-1);
  30
  31   /* We only need the most basic stuff to bootstrap the context tree */
  32   event_source ()->add_listener (GET_LISTENER (create_context_from_event),
  33                                 ly_symbol2scm ("CreateContext"));
  34   event_source ()->add_listener (GET_LISTENER (prepare),
  35                                 ly_symbol2scm ("Prepare"));
  36   events_below ()->register_as_listener (event_source_);
  37
  38   Context_def *globaldef = unsmob_context_def (definition_);
  39   if (!globaldef)
  40     programming_error ("no `Global' context found");
  41   else
  42     globaldef->apply_default_property_operations (this);
  43   accepts_list_ = scm_list_1 (ly_symbol2scm ("Score"));
  44 }
  45
  46 Output_def *
  47 Global_context::get_output_def () const
  48 {
  49   return output_def_;
  50 }
  51
  52 void
  53 Global_context::add_moment_to_process (Moment m)
  54 {
  55   if (m < now_mom_)
  56     programming_error ("trying to freeze in time");
  57
  58   for (vsize i = 0; i < extra_mom_pq_.size (); i++)
  59     if (extra_mom_pq_[i] == m)
  60       return;
  61   extra_mom_pq_.insert (m);
  62 }
  63
  64 Moment
  65 Global_context::sneaky_insert_extra_moment (Moment w)
  66 {
  67   while (extra_mom_pq_.size () && extra_mom_pq_.front () <= w)
  68     w = extra_mom_pq_.get ();
  69   return w;
  70 }
  71
  72 int
  73 Global_context::get_moments_left () const
  74 {
  75   return extra_mom_pq_.size ();
  76 }
  77
  78 IMPLEMENT_LISTENER (Global_context, prepare);
  79 void
  80 Global_context::prepare (SCM sev)
  81 {
  82   Stream_event *ev = unsmob_stream_event (sev);
  83   Moment *mom = unsmob_moment (ev->get_property ("moment"));
  84
  85   assert (mom);
  86
  87   if (prev_mom_.main_part_.is_infinity () && prev_mom_ < 0)
  88     prev_mom_ = *mom;
  89   else
  90     prev_mom_ = now_mom_;
  91   now_mom_ = *mom;
  92 }
  93
  94 Moment
  95 Global_context::now_mom () const
  96 {
  97   return now_mom_;
  98 }
  99
 100 Context *
 101 Global_context::get_score_context () const
 102 {
 103   return (scm_is_pair (context_list_))
 104     ? unsmob_context (scm_car (context_list_))
 105     : 0;
 106 }
 107
 108 SCM
 109 Global_context::get_output ()
 110 {
 111   Context * c = get_score_context ();
 112   if (c)
 113     return c->get_property ("output");
 114   else
 115     return SCM_EOL;
 116 }
 117
 118 void
 119 Global_context::run_iterator_on_me (Music_iterator *iter)
 120 {
 121   prev_mom_.set_infinite (-1);
 122   now_mom_.set_infinite (-1);
 123   Moment final_mom = iter->get_music ()->get_length ();
 124
 125   bool first = true;
 126   while (iter->ok () || get_moments_left ())
 127     {
 128       Moment w;
 129       w.set_infinite (1);
 130       if (iter->ok ())
 131         w = iter->pending_moment ();
 132
 133       w = sneaky_insert_extra_moment (w);
 134       if (w.main_part_.is_infinity () || w > final_mom)
 135         break;
 136
 137       if (w == prev_mom_)
 138         {
 139           programming_error ("Moment is not increasing. Aborting interpretation.");
 140           break ;
 141         }
 142
 143
 144       if (first)
 145         {
 146           /*
 147             Need this to get grace notes at start of a piece correct.
 148           */
 149           first = false;
 150           set_property ("measurePosition", w.smobbed_copy ());
 151         }
 152
 153       send_stream_event (this, "Prepare", 0,
 154                          ly_symbol2scm ("moment"), w.smobbed_copy ());
 155
 156       if (iter->ok ())
 157         iter->process (w);
 158
 159       send_stream_event (this, "OneTimeStep", 0, 0);
 160       apply_finalizations ();
 161       check_removal ();
 162     }
 163 }
 164
 165 void
 166 Global_context::apply_finalizations ()
 167 {
 168   SCM lst = get_property ("finalizations");
 169   set_property ("finalizations", SCM_EOL);
 170   for (SCM s = lst; scm_is_pair (s); s = scm_cdr (s))
 171
 172     /* TODO: make safe.  */
 173     scm_primitive_eval (scm_car (s));
 174 }
 175
 176 /* Add a function to execute before stepping to the next time step.  */
 177 void
 178 Global_context::add_finalization (SCM x)
 179 {
 180   SCM lst = get_property ("finalizations");
 181   lst = scm_cons (x, lst);
 182   set_property ("finalizations", lst);
 183 }
 184
 185 Moment
 186 Global_context::previous_moment () const
 187 {
 188   return prev_mom_;
 189 }
 190
 191 Context *
 192 Global_context::get_default_interpreter ()
 193 {
 194   if (get_score_context ())
 195     return get_score_context ()->get_default_interpreter ();
 196   else
 197     return Context::get_default_interpreter ();
 198 }
 199
 200 Global_context *
 201 unsmob_global_context (SCM x)
 202 {
 203   return dynamic_cast<Global_context *> (unsmob_context (x));
 204 }