(PATCH_LEVEL): bump.

[lilypond.git] / lily / translator.cc

diff --git a/lily/translator.cc b/lily/translator.cc
index a0dd3d0c2c0ce82c63526b7fc3e320e2f51fd172..e3c973ebbedfac96b2a5d0eb21b0a449e3455714 100644 (file)
--- a/lily/translator.cc
+++ b/lily/translator.cc
@@ -8,10 +8,12 @@
 
 #include "translator.hh"
 
-#include "warn.hh"
-#include "translator-group.hh"
 #include "context-def.hh"
+#include "dispatcher.hh"
 #include "global-context.hh"
+#include "international.hh"
+#include "translator-group.hh"
+#include "warn.hh"
 
 #include "translator.icc"
 #include "ly-smobs.icc"
@@ -74,6 +76,12 @@ Translator::get_daddy_translator () const
   return daddy_context_->implementation ();
 }
 
+void
+Translator::protect_event (SCM ev)
+{
+  get_daddy_translator ()->protect_event (ev);
+}
+
 SCM
 Translator::internal_get_property (SCM sym) const
 {
@@ -108,6 +116,82 @@ Translator::finalize ()
 {
 }
 
+void
+Translator::connect_to_context (Context *c)
+{
+  for (translator_listener_record *r = get_listener_list (); r; r=r->next_)
+    c->events_below ()->add_listener (r->get_listener_ (this), r->event_class_);
+}
+
+void
+Translator::disconnect_from_context (Context *c)
+{
+  for (translator_listener_record *r = get_listener_list (); r; r=r->next_)
+    c->events_below ()->remove_listener (r->get_listener_ (this), r->event_class_);
+}
+
+static SCM listened_event_class_table;
+void
+ensure_listened_hash ()
+{
+  if (!listened_event_class_table)
+    listened_event_class_table = scm_permanent_object (scm_c_make_hash_table (61));
+}
+
+
+LY_DEFINE (ly_get_listened_event_classes, "ly:get-listened-event-classes",
+          0, 0, 0, (),
+          "Returns a list of all event classes that some translator listens to.")
+{
+  ensure_listened_hash ();
+  return ly_hash_table_keys (listened_event_class_table);
+}
+
+LY_DEFINE (ly_is_listened_event_class, "ly:is-listened-event-class",
+          1, 0, 0, (SCM sym),
+          "Is @var{sym} a listened event class?")
+{
+  ensure_listened_hash ();
+  return scm_hashq_ref (listened_event_class_table, sym, SCM_BOOL_F);
+}
+
+void
+add_listened_event_class (SCM sym)
+{
+  ensure_listened_hash ();
+
+  scm_hashq_set_x (listened_event_class_table, sym, SCM_BOOL_T);
+}
+
+
+/*
+  internally called once, statically, for each translator
+  listener. Connects the name of an event class with a procedure that
+  fetches the corresponding listener.
+
+  The method should only be called from the macro
+  IMPLEMENT_TRANSLATOR_LISTENER.
+ */
+void
+Translator::add_translator_listener (translator_listener_record **listener_list,
+                                    translator_listener_record *r,
+                                    Listener (*get_listener) (void *), 
+                                    const char *ev_class)
+{
+  /* ev_class is the C++ identifier name. Convert to scm symbol */
+  string name = string (ev_class);
+  name = replace_all (name, '_', '-');
+  name += "-event";
+  
+  SCM class_sym = scm_str2symbol (name.c_str ());
+  
+  add_listened_event_class (class_sym);
+  r->event_class_ = class_sym;
+  r->get_listener_ = get_listener;
+  r->next_ = *listener_list;
+  *listener_list = r;
+}
+
 /*
   SMOBS
 */
@@ -125,7 +209,7 @@ Translator::get_global_context () const
   return daddy_context_->get_global_context ();
 }
 
-Score_context *
+Context *
 Translator::get_score_context () const
 {
   return daddy_context_->get_score_context ();
@@ -159,22 +243,22 @@ Translator::print_smob (SCM s, SCM port, scm_print_state *)
 void
 add_acknowledger (Engraver_void_function_engraver_grob_info ptr,
                  char const *func_name,
-                 std::vector<Acknowledge_information> *ack_array)
+                 vector<Acknowledge_information> *ack_array)
 {
   Acknowledge_information inf;
   inf.function_ = ptr;
 
-  std::string interface_name (func_name);
+  string interface_name (func_name);
 
   interface_name = replace_all (interface_name, '_', '-');
   interface_name += "-interface";
 
-  inf.symbol_ = scm_gc_protect_object (ly_symbol2scm (interface_name.c_str ()));
+  inf.symbol_ = ly_symbol2scm (interface_name.c_str ());
   ack_array->push_back (inf);
 }
 
 Engraver_void_function_engraver_grob_info
-generic_get_acknowledger (SCM sym, std::vector<Acknowledge_information> const *ack_array)
+generic_get_acknowledger (SCM sym, vector<Acknowledge_information> const *ack_array)
 {
   for (vsize i = 0; i < ack_array->size (); i++)
     {
@@ -184,6 +268,47 @@ generic_get_acknowledger (SCM sym, std::vector<Acknowledge_information> const *a
   return 0;
 }
 
+Moment
+get_event_length (Stream_event *e)
+{
+  Moment *m = unsmob_moment (e->get_property ("length"));
+  if (m)
+    return *m;
+  else
+    return Moment (0);
+}
+
+/*
+  Helper, used through ASSIGN_EVENT_ONCE to throw warnings for
+  simultaneous events. The helper is only useful in listen_* methods
+  of translators.
+*/
+bool
+internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function)
+{
+  if (*old_ev)
+    {
+      /* extract event class from function name */
+      const char *prefix = "listen_";
+      assert (!strncmp (function, "listen_", strlen (prefix)));
+      function += strlen (prefix);
+      char ev_class[strlen (function) + 1];
+      strcpy (ev_class, function);
+      for (char *c = ev_class; *c; c++)
+       if (*c == '_')
+         *c = '-';
+
+      new_ev->origin ()->warning (_f ("Two simultaneous %s events, junking this one", ev_class));
+      (*old_ev)->origin ()->warning (_f ("Previous %s event here", ev_class));
+      return false;
+    }
+  else
+    {
+      *old_ev = new_ev;
+      return true;
+    }
+}
+
 ADD_TRANSLATOR (Translator,
                "Base class. Unused",
                "",