Added new system for how translators listen to events.

[lilypond.git] / lily / translator.cc

diff --git a/lily/translator.cc b/lily/translator.cc
index 56d49add4697d52eac4a682d5e5d6ac7d57d6191..7bd0e6b47e7f19e69452e9d1e2c3e38663d7f598 100644 (file)
--- a/lily/translator.cc
+++ b/lily/translator.cc
@@ -11,6 +11,7 @@
 #include "warn.hh"
 #include "translator-group.hh"
 #include "context-def.hh"
+#include "dispatcher.hh"
 #include "global-context.hh"
 
 #include "translator.icc"
@@ -74,6 +75,12 @@ 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 +115,46 @@ 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_);
+}
+
+/*
+  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 = name + "-event";
+  /* It's OK to use scm_gc_protect_object for protection, because r is
+     statically allocated. */
+  r->event_class_ = scm_gc_protect_object (scm_str2symbol (name.c_str ()));
+  r->get_listener_ = get_listener;
+  r->next_ = *listener_list;
+  *listener_list = r;
+}
+
 /*
   SMOBS
 */
@@ -125,7 +172,7 @@ 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 ();
@@ -159,27 +206,27 @@ Translator::print_smob (SCM s, SCM port, scm_print_state *)
 void
 add_acknowledger (Engraver_void_function_engraver_grob_info ptr,
                  char const *func_name,
-                 Array<Acknowledge_information> *ack_array)
+                 vector<Acknowledge_information> *ack_array)
 {
   Acknowledge_information inf;
   inf.function_ = ptr;
 
-  String interface_name (func_name);
+  string interface_name (func_name);
 
-  interface_name = interface_name.substitute ('_', '-');
+  interface_name = replace_all (interface_name, '_', '-');
   interface_name += "-interface";
 
   inf.symbol_ = scm_gc_protect_object (ly_symbol2scm (interface_name.c_str ()));
-  ack_array->push (inf);
+  ack_array->push_back (inf);
 }
 
 Engraver_void_function_engraver_grob_info
-generic_get_acknowledger (SCM sym, Array<Acknowledge_information> const *ack_array)
+generic_get_acknowledger (SCM sym, vector<Acknowledge_information> const *ack_array)
 {
-  for (int i = 0; i < ack_array->size (); i++)
+  for (vsize i = 0; i < ack_array->size (); i++)
     {
-      if (ack_array->elem (i).symbol_ == sym)
-       return ack_array->elem (i).function_;
+      if (ack_array->at (i).symbol_ == sym)
+       return ack_array->at (i).function_;
     }
   return 0;
 }