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--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "global-context.hh"
  10
  11 #include <cstdio>
  12
  13 #include "warn.hh"
  14 #include "event.hh"
  15 #include "music-iterator.hh"
  16 #include "score-context.hh"
  17 #include "context-def.hh"
  18 #include "output-def.hh"
  19 #include "lilypond-key.hh"
  20
  21 Global_context::Global_context (Output_def *o, Moment final, Object_key *key)
  22   : Context (new Lilypond_context_key (key,
  23                                        Moment (0),
  24                                        "Global", "", 0))
  25 {
  26   output_def_ = o;
  27   final_mom_ = final;
  28   definition_ = find_context_def (o, ly_symbol2scm ("Global"));
  29
  30   Context_def *globaldef = unsmob_context_def (definition_);
  31   if (!globaldef)
  32     {
  33       programming_error ("no `Global' context found");
  34     }
  35   else
  36     globaldef->apply_default_property_operations (this);
  37   accepts_list_ = scm_list_1 (ly_symbol2scm ("Score"));
  38 }
  39
  40 Output_def *
  41 Global_context::get_output_def () const
  42 {
  43   return output_def_;
  44 }
  45
  46 void
  47 Global_context::add_moment_to_process (Moment m)
  48 {
  49   if (m > final_mom_)
  50     return;
  51
  52   if (m < now_mom_)
  53     programming_error ("trying to freeze in time");
  54
  55   for (int i = 0; i < extra_mom_pq_.size (); i++)
  56     if (extra_mom_pq_[i] == m)
  57       return;
  58   extra_mom_pq_.insert (m);
  59 }
  60
  61 Moment
  62 Global_context::sneaky_insert_extra_moment (Moment w)
  63 {
  64   while (extra_mom_pq_.size () && extra_mom_pq_.front () <= w)
  65     w = extra_mom_pq_.get ();
  66   return w;
  67 }
  68
  69 int
  70 Global_context::get_moments_left () const
  71 {
  72   return extra_mom_pq_.size ();
  73 }
  74
  75 void
  76 Global_context::prepare (Moment m)
  77 {
  78   prev_mom_ = now_mom_;
  79   now_mom_ = m;
  80
  81   clear_key_disambiguations ();
  82   if (get_score_context ())
  83     get_score_context ()->prepare (m);
  84 }
  85
  86 Moment
  87 Global_context::now_mom () const
  88 {
  89   return now_mom_;
  90 }
  91
  92 Score_context *
  93 Global_context::get_score_context () const
  94 {
  95   return (scm_is_pair (context_list_))
  96     ? dynamic_cast<Score_context *> (unsmob_context (scm_car (context_list_)))
  97     : 0;
  98 }
  99
 100 Music_output *
 101 Global_context::get_output ()
 102 {
 103   return get_score_context ()->get_output ();
 104 }
 105
 106 void
 107 Global_context::one_time_step ()
 108 {
 109   get_score_context ()->one_time_step ();
 110   apply_finalizations ();
 111   check_removal ();
 112 }
 113
 114 void
 115 Global_context::finish ()
 116 {
 117   if (get_score_context ())
 118     get_score_context ()->finish ();
 119 }
 120
 121 void
 122 Global_context::run_iterator_on_me (Music_iterator *iter)
 123 {
 124   if (iter->ok ())
 125     prev_mom_ = now_mom_ = iter->pending_moment ();
 126
 127   bool first = true;
 128   while (iter->ok () || get_moments_left ())
 129     {
 130       Moment w;
 131       w.set_infinite (1);
 132       if (iter->ok ())
 133         {
 134           w = iter->pending_moment ();
 135         }
 136
 137       w = sneaky_insert_extra_moment (w);
 138       if (w.main_part_.is_infinity ())
 139         break;
 140
 141       if (first)
 142         {
 143           /*
 144             Need this to get grace notes at start of a piece correct.
 145           */
 146           first = false;
 147           set_property ("measurePosition", w.smobbed_copy ());
 148         }
 149
 150       prepare (w);
 151
 152       if (iter->ok ())
 153         iter->process (w);
 154
 155       if (!get_score_context ())
 156         {
 157           SCM sym = ly_symbol2scm ("Score");
 158           Context_def *t = unsmob_context_def (find_context_def (get_output_def (), sym));
 159           if (!t)
 160             error (_f ("can't find `%s' context", "Score"));
 161
 162           Object_key const *key = get_context_key ("Score", "");
 163           Context *c = t->instantiate (SCM_EOL, key);
 164           add_context (c);
 165
 166           Score_context *sc = dynamic_cast<Score_context *> (c);
 167           sc->prepare (w);
 168         }
 169
 170       one_time_step ();
 171     }
 172 }
 173
 174 void
 175 Global_context::apply_finalizations ()
 176 {
 177   SCM lst = get_property ("finalizations");
 178   set_property ("finalizations", SCM_EOL);
 179   for (SCM s = lst; scm_is_pair (s); s = scm_cdr (s))
 180     /* TODO: make safe.  */
 181     scm_primitive_eval (scm_car (s));
 182 }
 183
 184 /* Add a function to execute before stepping to the next time step.  */
 185 void
 186 Global_context::add_finalization (SCM x)
 187 {
 188   SCM lst = get_property ("finalizations");
 189   lst = scm_cons (x, lst);
 190   set_property ("finalizations", lst);
 191 }
 192
 193 Moment
 194 Global_context::previous_moment () const
 195 {
 196   return prev_mom_;
 197 }
 198
 199 Context *
 200 Global_context::get_default_interpreter ()
 201 {
 202   if (get_score_context ())
 203     return get_score_context ()->get_default_interpreter ();
 204   else
 205     return Context::get_default_interpreter ();
 206 }