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 "context-def.hh"
11 #include "context-selector.hh"
13 #include "ly-smobs.icc"
15 #include "output-def.hh"
16 #include "scm-hash.hh"
17 #include "score-context.hh"
18 #include "translator-group.hh"
22 Context::is_removable () const
24 return context_list_ == SCM_EOL && ! iterator_count_ &&
25 !dynamic_cast<Score_context const*> (this);
29 Context::check_removal ()
31 for (SCM p = context_list_; scm_is_pair (p); p = scm_cdr (p))
33 Context *trg = unsmob_context (scm_car (p));
35 trg->check_removal ();
36 if (trg->is_removable ())
38 recurse_over_translators (trg, &Translator::finalize, UP);
44 Context::Context (Context const&)
50 Context::properties_dict () const
52 return Scheme_hash_table::unsmob (properties_scm_);
56 Context::add_context (Context *t)
58 SCM ts = t->self_scm ();
59 context_list_ = ly_append2 (context_list_,
60 scm_cons (ts, SCM_EOL));
62 t->daddy_context_ = this;
66 Context_selector::register_context (t);
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_over_translators (t, &Translator::initialize, DOWN);
87 implementation_ = SCM_EOL;
88 properties_scm_ = SCM_EOL;
89 accepts_list_ = SCM_EOL;
90 context_list_ = SCM_EOL;
91 definition_ = SCM_EOL;
95 properties_scm_ = (new Scheme_hash_table)->self_scm ();
96 scm_gc_unprotect_object (properties_scm_);
102 Context::find_create_context (SCM n, String id,
106 Don't create multiple score contexts.
108 if (dynamic_cast<Global_context*> (this)
109 && dynamic_cast<Global_context*> (this)->get_score_context ())
110 return get_score_context ()->find_create_context (n, id, operations);
113 Context * existing = find_context_below (this, n,id);
117 if (n == ly_symbol2scm ("Bottom"))
119 Context* tg = get_default_interpreter ();
125 TODO: use accepts_list_.
127 Link_array<Context_def> path
128 = unsmob_context_def (definition_)->path_to_acceptable_context (n, get_output_def ());
132 Context * current = this;
134 // start at 1. The first one (index 0) will be us.
135 for (int i=0; i < path.size (); i++)
137 SCM ops = (i == path.size () -1) ? operations : SCM_EOL;
140 = path[i]->instantiate (ops);
142 if (i == path.size () -1)
144 new_group->id_string_ = id;
147 current->add_context (new_group);
148 apply_property_operations (new_group, ops);
157 Don't go up to Global_context, because global goes down to
161 if (daddy_context_ && !dynamic_cast<Global_context*> (daddy_context_))
162 ret = daddy_context_->find_create_context (n, id, operations);
165 warning (_f ("Cannot find or create `%s' called `%s'",
166 ly_symbol2string (n).to_str0 (), id));
173 Default child context as a SCM string, or something else if there is
177 Context::default_child_context_name () const
179 return scm_is_pair (accepts_list_)
180 ? scm_car (scm_last_pair (accepts_list_))
186 Context::is_bottom_context () const
188 return !scm_is_symbol (default_child_context_name ());
192 Context::get_default_interpreter ()
194 if (!is_bottom_context ())
196 SCM nm = default_child_context_name ();
197 SCM st = find_context_def (get_output_def (), nm);
199 Context_def *t = unsmob_context_def (st);
202 warning (_f ("can't find or create: `%s'", ly_symbol2string (nm).to_str0 ()));
203 t = unsmob_context_def (this->definition_);
205 Context *tg = t->instantiate (SCM_EOL);
207 if (!tg->is_bottom_context ())
208 return tg->get_default_interpreter ();
219 Context::where_defined (SCM sym) const
221 if (properties_dict ()->contains (sym))
223 return (Context*)this;
226 return (daddy_context_) ? daddy_context_->where_defined (sym) : 0;
230 return SCM_EOL when not found.
233 Context::internal_get_property (SCM sym) const
236 if (properties_dict ()->try_retrieve (sym, &val))
240 return daddy_context_->internal_get_property (sym);
246 Context::is_alias (SCM sym) const
248 if (sym == ly_symbol2scm ("Bottom")
249 && !scm_is_pair (accepts_list_))
251 if (sym == unsmob_context_def (definition_)->get_context_name ())
254 return scm_c_memq (sym, aliases_) != SCM_BOOL_F;
258 Context::add_alias (SCM sym)
260 aliases_ = scm_cons (sym, aliases_);
266 Context::internal_set_property (SCM sym, SCM val)
269 if (internal_type_checking_global_b)
270 assert (type_check_assignment (sym, val, ly_symbol2scm ("translation-type?")));
273 properties_dict ()->set (sym, val);
277 TODO: look up to check whether we have inherited var?
280 Context::unset_property (SCM sym)
282 properties_dict ()->remove (sym);
286 Remove a context from the hierarchy.
289 Context::remove_context (Context*trans)
293 context_list_ = scm_delq_x (trans->self_scm (), context_list_);
294 trans->daddy_context_ = 0;
299 ID == "" means accept any ID.
302 find_context_below (Context * where,
305 if (where->is_alias (type))
307 if (id == "" || where->id_string () == id)
312 for (SCM s = where->children_contexts ();
313 !found && scm_is_pair (s); s = scm_cdr (s))
315 Context *tr = unsmob_context (scm_car (s));
317 found = find_context_below (tr, type, id);
324 Context::properties_as_alist () const
326 return properties_dict ()->to_alist ();
330 Context::context_name_symbol () const
332 Context_def *td = unsmob_context_def (definition_);
333 return td->get_context_name ();
337 Context::context_name () const
339 return ly_symbol2string (context_name_symbol ());
343 Context::get_score_context () const
345 if (Score_context *sc = dynamic_cast<Score_context*> ((Context*) this))
347 else if (daddy_context_)
348 return daddy_context_->get_score_context ();
354 Context::get_output_def () const
356 return daddy_context_ ? daddy_context_->get_output_def () : 0;
365 Context::now_mom () const
367 return daddy_context_->now_mom ();
371 Context::print_smob (SCM s, SCM port, scm_print_state *)
373 Context *sc = (Context *) SCM_CELL_WORD_1 (s);
375 scm_puts ("#<", port);
376 scm_puts (classname (sc), port);
377 if (Context_def *d = unsmob_context_def (sc->definition_))
379 scm_puts (" ", port);
380 scm_display (d->get_context_name (), port);
383 if (Context *td=dynamic_cast<Context *> (sc))
385 scm_puts ("=", port);
386 scm_puts (td->id_string_.to_str0 (), port);
390 scm_puts (" ", port);
392 scm_display (sc->context_list_, port);
393 scm_puts (" >", port);
399 Context::mark_smob (SCM sm)
401 Context *me = (Context*) SCM_CELL_WORD_1 (sm);
403 scm_gc_mark (me->context_list_);
404 scm_gc_mark (me->aliases_);
405 scm_gc_mark (me->definition_);
406 scm_gc_mark (me->properties_scm_);
407 scm_gc_mark (me->accepts_list_);
408 scm_gc_mark (me->implementation_);
410 return me->properties_scm_;
413 IMPLEMENT_SMOBS (Context);
414 IMPLEMENT_DEFAULT_EQUAL_P (Context);
415 IMPLEMENT_TYPE_P (Context,"ly:context?");
418 Context::try_music (Music* m)
420 Translator* t = implementation ();
424 bool b = t->try_music (m);
425 if (!b && daddy_context_)
426 b = daddy_context_->try_music (m);
433 Context::get_global_context () const
435 if (dynamic_cast<Global_context *>((Context*) this))
436 return dynamic_cast<Global_context *> ((Context*) this);
439 return daddy_context_->get_global_context ();
441 programming_error ("No Global context!");
446 Context::get_parent_context () const
448 return daddy_context_;
452 Context::implementation () const
454 return dynamic_cast<Translator_group*> (unsmob_translator (implementation_));