2 translator-group.cc -- implement Translator_group
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>,
7 Erik Sandberg <mandolaerik@gmail.com>
10 #include "translator-group.hh"
12 #include "context-def.hh"
14 #include "dispatcher.hh"
15 #include "engraver-group.hh"
16 #include "international.hh"
19 #include "output-def.hh"
20 #include "performer-group.hh"
21 #include "scm-hash.hh"
26 translator_each (SCM list, Translator_method method)
28 for (SCM p = list; scm_is_pair (p); p = scm_cdr (p))
29 (unsmob_translator (scm_car (p))->*method) ();
33 Translator_group::initialize ()
35 precompute_method_bindings ();
39 Translator_group::connect_to_context (Context *c)
43 programming_error ("translator group is already connected to context "
44 + context_->context_name ());
48 c->event_source ()->add_listener (GET_LISTENER (create_child_translator),
49 ly_symbol2scm ("AnnounceNewContext"));
50 for (SCM tr_list = simple_trans_list_; scm_is_pair (tr_list); tr_list = scm_cdr (tr_list))
52 Translator *tr = unsmob_translator (scm_car (tr_list));
53 tr->connect_to_context (c);
58 Translator_group::disconnect_from_context ()
60 for (SCM tr_list = simple_trans_list_; scm_is_pair (tr_list); tr_list = scm_cdr (tr_list))
62 Translator *tr = unsmob_translator (scm_car (tr_list));
63 tr->disconnect_from_context (context_);
65 context_->event_source ()->remove_listener (GET_LISTENER (create_child_translator),
66 ly_symbol2scm ("AnnounceNewContext"));
68 protected_events_ = SCM_EOL;
72 Translator_group::finalize ()
77 filter_performers (SCM ell)
80 for (SCM p = ell; scm_is_pair (p); p = scm_cdr (p))
82 if (dynamic_cast<Performer *> (unsmob_translator (scm_car (*tail))))
83 *tail = scm_cdr (*tail);
85 tail = SCM_CDRLOC (*tail);
91 filter_engravers (SCM ell)
94 for (SCM p = ell; scm_is_pair (p); p = scm_cdr (p))
96 if (dynamic_cast<Engraver *> (unsmob_translator (scm_car (*tail))))
97 *tail = scm_cdr (*tail);
99 tail = SCM_CDRLOC (*tail);
105 Protects the parameter from being garbage collected. The object is
106 protected until the next disconnect_from_context call.
108 Whenever a child translator hears an event, the event is added to
109 this list. This eliminates the need for derived_mark methods in most
110 translators; all incoming events are instead protected by the
113 TODO: Should the list also be flushed at the beginning of each new
117 Translator_group::protect_event (SCM ev)
119 protected_events_ = scm_cons (ev, protected_events_);
123 Create a new translator for a newly created child context. Triggered
124 by AnnounceNewContext events.
126 IMPLEMENT_LISTENER (Translator_group, create_child_translator);
128 Translator_group::create_child_translator (SCM sev)
130 Stream_event *ev = unsmob_stream_event (sev);
131 // get from AnnounceNewContext
132 SCM cs = ev->get_property ("context");
133 Context *new_context = unsmob_context (cs);
134 Context_def *def = unsmob_context_def (new_context->get_definition ());
135 SCM ops = new_context->get_definition_mods ();
137 SCM trans_names = def->get_translator_names (ops);
139 Translator_group *g = get_translator_group (def->get_translator_group_type ());
140 SCM trans_list = SCM_EOL;
142 for (SCM s = trans_names; scm_is_pair (s); s = scm_cdr (s))
144 Translator *type = get_translator (scm_car (s));
146 warning (_f ("cannot find: `%s'", ly_symbol2string (scm_car (s)).c_str ()));
149 Translator *tr = type->clone ();
150 SCM str = tr->self_scm ();
152 if (tr->must_be_last ())
154 SCM cons = scm_cons (str, SCM_EOL);
155 if (scm_is_pair (trans_list))
156 scm_set_cdr_x (scm_last_pair (trans_list), cons);
161 trans_list = scm_cons (str, trans_list);
163 tr->daddy_context_ = new_context;
168 /* Filter unwanted translator types. Required to make
169 \with {\consists "..."} work. */
170 if (dynamic_cast<Engraver_group *> (g))
171 g->simple_trans_list_ = filter_performers (trans_list);
172 else if (dynamic_cast<Performer_group *> (g))
173 g->simple_trans_list_ = filter_engravers (trans_list);
175 // TODO: scrap Context::implementation
176 new_context->implementation_ = g;
178 g->connect_to_context (new_context);
181 recurse_over_translators (new_context,
182 &Translator::initialize,
183 &Translator_group::initialize,
188 Translator_group::get_simple_trans_list ()
190 return simple_trans_list_;
194 precomputed_recurse_over_translators (Context *c, Translator_precompute_index idx, Direction dir)
197 = dynamic_cast<Translator_group *> (c->implementation ());
199 if (tg && dir == DOWN)
201 tg->precomputed_translator_foreach (idx);
202 tg->call_precomputed_self_method (idx);
205 for (SCM s = c->children_contexts (); scm_is_pair (s);
207 precomputed_recurse_over_translators (unsmob_context (scm_car (s)), idx, dir);
211 tg->precomputed_translator_foreach (idx);
212 tg->call_precomputed_self_method (idx);
217 recurse_over_translators (Context *c, Translator_method ptr,
218 Translator_group_method tg_ptr, Direction dir)
221 = dynamic_cast<Translator_group *> (c->implementation ());
223 if (tg && dir == DOWN)
226 translator_each (tg->get_simple_trans_list (), ptr);
229 for (SCM s = c->children_contexts (); scm_is_pair (s);
231 recurse_over_translators (unsmob_context (scm_car (s)), ptr, tg_ptr, dir);
235 translator_each (tg->get_simple_trans_list (),
242 Translator_group::Translator_group ()
244 simple_trans_list_ = SCM_EOL;
245 protected_events_ = SCM_EOL;
251 Translator_group::derived_mark () const
256 Translator_group::precompute_method_bindings ()
258 for (SCM s = simple_trans_list_; scm_is_pair (s); s = scm_cdr (s))
260 Translator *tr = unsmob_translator (scm_car (s));
261 Translator_void_method_ptr ptrs[TRANSLATOR_METHOD_PRECOMPUTE_COUNT];
262 tr->fetch_precomputable_methods (ptrs);
265 for (int i = 0; i < TRANSLATOR_METHOD_PRECOMPUTE_COUNT; i++)
268 precomputed_method_bindings_[i].push_back (Translator_method_binding (tr, ptrs[i]));
272 fetch_precomputable_methods (precomputed_self_method_bindings_);
276 Translator_group::precomputed_translator_foreach (Translator_precompute_index idx)
278 vector<Translator_method_binding> &bindings (precomputed_method_bindings_[idx]);
279 for (vsize i = 0; i < bindings.size (); i++)
280 bindings[i].invoke ();
284 Translator_group::fetch_precomputable_methods (Translator_group_void_method ptrs[])
286 for (int i = 0; i < TRANSLATOR_METHOD_PRECOMPUTE_COUNT; i++)
291 Translator_group::call_precomputed_self_method (Translator_precompute_index idx)
293 if (precomputed_self_method_bindings_[idx])
294 (*precomputed_self_method_bindings_[idx]) (this);
297 Translator_group::~Translator_group ()
301 #include "ly-smobs.icc"
303 IMPLEMENT_SMOBS (Translator_group);
304 IMPLEMENT_DEFAULT_EQUAL_P (Translator_group);
305 IMPLEMENT_TYPE_P (Translator_group, "ly:translator-group?");
308 Translator_group::print_smob (SCM s, SCM port, scm_print_state *)
310 Translator_group *me = (Translator_group *) SCM_CELL_WORD_1 (s);
311 scm_puts ("#<Translator_group ", port);
312 scm_puts (me->class_name (), port);
313 scm_display (me->simple_trans_list_, port);
314 scm_puts (" >", port);
319 Translator_group::mark_smob (SCM smob)
321 Translator_group *me = (Translator_group *)SCM_CELL_WORD_1 (smob);
324 scm_gc_mark (me->protected_events_);
325 return me->simple_trans_list_;