2 context.cc -- implement Context
4 source file of the GNU LilyPond music typesetter
6 (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "translator-group.hh"
11 #include "context-def.hh"
14 #include "music-output-def.hh"
15 #include "scm-hash.hh"
17 #include "ly-smobs.icc"
18 #include "score-context.hh"
21 Context::is_removable () const
23 return context_list_ == SCM_EOL && ! iterator_count_ &&
24 !dynamic_cast<Score_context const*> (this)
30 Context::check_removal ()
32 for (SCM p = context_list_; gh_pair_p (p); p = gh_cdr (p))
34 Context *trg = unsmob_context (ly_car (p));
36 trg->check_removal ();
37 if (trg->is_removable ())
39 recurse_down_translators (trg, &Translator::finalize, false);
45 Context::Context (Context const&)
51 Context::properties_dict () const
53 return Scheme_hash_table::unsmob (properties_scm_);
57 Context::add_context (Context*t)
59 SCM ts = t->self_scm ();
60 context_list_ = gh_append2 (context_list_,
61 gh_cons (ts, SCM_EOL));
63 t->daddy_context_ = this;
68 scm_gc_unprotect_object (ts);
69 Context_def * td = unsmob_context_def (t->definition_);
72 this can not move before add_context(), because \override
73 operations require that we are in the hierarchy.
75 td->apply_default_property_operations (t);
77 recurse_down_translators (t, &Translator::initialize, true);
86 implementation_ = SCM_EOL;
87 properties_scm_ = SCM_EOL;
88 accepts_list_ = SCM_EOL;
89 context_list_ = SCM_EOL;
90 definition_ = SCM_EOL;
94 Scheme_hash_table *tab = new Scheme_hash_table ;
95 properties_scm_ = tab->self_scm ();
96 scm_gc_unprotect_object (tab->self_scm ());
100 Context::find_existing_context (SCM n, String id)
102 if ((is_alias (n) && (id_string_ == id || id.is_empty ())) || n == ly_symbol2scm ("Current"))
106 for (SCM p = context_list_; !r && gh_pair_p (p); p = ly_cdr (p))
108 Context * t = unsmob_context (ly_car (p));
110 r = dynamic_cast<Context*> (t)->find_existing_context (n, id);
118 Context::find_create_context (SCM n, String id,
121 Context * existing = find_existing_context (n,id);
125 if (n == ly_symbol2scm ("Bottom"))
127 Context* tg = get_default_interpreter ();
133 TODO: use accepts_list_.
135 Link_array<Context_def> path
136 = unsmob_context_def (definition_)->path_to_acceptable_context (n, get_output_def ());
140 Context * current = this;
142 // start at 1. The first one (index 0) will be us.
143 for (int i=0; i < path.size (); i++)
145 SCM ops = (i == path.size () -1) ? operations : SCM_EOL;
148 = path[i]->instantiate (ops);
150 if (i == path.size () -1)
152 new_group->id_string_ = id;
155 current->add_context (new_group);
156 apply_property_operations (new_group, ops);
166 ret = daddy_context_->find_create_context (n, id, operations);
169 warning (_f ("Cannot find or create `%s' called `%s'",
170 ly_symbol2string (n).to_str0 (), id));
177 Default child context as a SCM string, or something else if there is
181 default_child_context_name (Context const *tg)
183 return gh_pair_p (tg->accepts_list_)
184 ? ly_car (scm_last_pair (tg->accepts_list_))
190 Context::is_bottom_context () const
192 return !gh_symbol_p (default_child_context_name (this));
196 Context::get_default_interpreter ()
198 if (!is_bottom_context ())
200 SCM nm = default_child_context_name (this);
201 SCM st = get_output_def ()->find_context_def (nm);
203 Context_def *t = unsmob_context_def (st);
206 warning (_f ("can't find or create: `%s'", ly_symbol2string (nm).to_str0 ()));
207 t = unsmob_context_def (this->definition_);
209 Context *tg = t->instantiate (SCM_EOL);
211 if (!tg->is_bottom_context ())
212 return tg->get_default_interpreter ();
223 Context::where_defined (SCM sym) const
225 if (properties_dict ()->contains (sym))
227 return (Context*)this;
230 return (daddy_context_) ? daddy_context_->where_defined (sym) : 0;
234 return SCM_EOL when not found.
237 Context::internal_get_property (SCM sym) const
240 if (properties_dict ()->try_retrieve (sym, &val))
244 return daddy_context_->internal_get_property (sym);
250 Context::is_alias (SCM sym) const
252 if (sym == ly_symbol2scm ("Bottom")
253 && !gh_pair_p (accepts_list_))
255 return unsmob_context_def (definition_)->is_alias (sym);
259 Context::internal_set_property (SCM sym, SCM val)
262 if (internal_type_checking_global_b)
263 assert (type_check_assignment (sym, val, ly_symbol2scm ("translation-type?")));
266 properties_dict ()->set (sym, val);
270 TODO: look up to check whether we have inherited var?
273 Context::unset_property (SCM sym)
275 properties_dict ()->remove (sym);
279 Remove a context from the hierarchy.
282 Context::remove_context (Context*trans)
286 context_list_ = scm_delq_x (trans->self_scm (), context_list_);
287 trans->daddy_context_ = 0;
292 ID == "" means accept any ID.
295 find_context_below (Context * where,
296 String type, String id)
298 if (where->is_alias (ly_symbol2scm (type.to_str0 ())))
300 if (id == "" || where->id_string_ == id)
305 for (SCM s = where->context_list_;
306 !found && gh_pair_p (s); s = gh_cdr (s))
308 Context * tr = unsmob_context (gh_car (s));
310 found = find_context_below (tr, type, id);
317 Context::properties_as_alist () const
319 return properties_dict()->to_alist();
323 Context::context_name () const
325 Context_def * td = unsmob_context_def (definition_ );
326 return ly_symbol2string (td->get_context_name ());
331 Context::get_score_context () const
333 if (Score_context *sc =dynamic_cast<Score_context*> ((Context*)this))
335 else if (daddy_context_)
336 return daddy_context_->get_score_context ();
342 Context::get_output_def () const
344 return (daddy_context_)
345 ? daddy_context_->get_output_def () : 0;
354 Context::now_mom () const
356 return daddy_context_->now_mom();
360 Context::print_smob (SCM s, SCM port, scm_print_state *)
362 Context *sc = (Context *) ly_cdr (s);
364 scm_puts ("#<", port);
365 scm_puts (classname (sc), port);
366 if (Context_def *d=unsmob_context_def (sc->definition_))
368 scm_puts (" ", port);
369 scm_display (d->get_context_name (), port);
372 if (Context *td=dynamic_cast<Context *> (sc))
374 scm_puts ("=", port);
375 scm_puts (td->id_string_.to_str0 (), port);
379 scm_puts (" ", port);
380 scm_display (sc->implementation_, port);
383 Translator * tr = unsmob_translator (sc->implementation_);
384 if (Translator_group *tg = dynamic_cast<Translator_group*> (tr))
385 scm_display (tg->get_simple_trans_list (), port);
389 don't try to print properties, that is too much hassle.
391 scm_puts (" >", port);
397 Context::mark_smob (SCM sm)
399 Context * me = (Context*) SCM_CELL_WORD_1 (sm);
401 scm_gc_mark (me->context_list_);
402 scm_gc_mark (me->definition_);
403 scm_gc_mark (me->properties_scm_);
404 scm_gc_mark (me->accepts_list_);
405 scm_gc_mark (me->implementation_);
407 return me->properties_scm_;
410 IMPLEMENT_SMOBS (Context);
411 IMPLEMENT_DEFAULT_EQUAL_P (Context);
412 IMPLEMENT_TYPE_P(Context,"ly:context?");
415 Context::try_music (Music* m)
417 Translator* t = unsmob_translator (implementation_);
421 bool b = t->try_music (m);
422 if (!b && daddy_context_)
423 b = daddy_context_->try_music (m);
430 Context::get_global_context () const
432 if (dynamic_cast<Global_context *>((Context*) this))
433 return dynamic_cast<Global_context *> ((Context*) this);
436 return daddy_context_->get_global_context ();
438 programming_error ("No Global context!");