lily/include/translator.icc

   1 /*
   2   translator.icc -- declare Translator glue wiring.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #ifndef TRANSLATOR_ICC
  10 #define TRANSLATOR_ICC
  11
  12 #include "listener.hh"
  13 #include "std-vector.hh"
  14 #include "translator.hh"
  15
  16 /*
  17   TODO: derive "foo-bar-interface" from Foo_bar classname.
  18  */
  19
  20 /**
  21    A macro to automate administration of translators.
  22 */
  23 #define ADD_THIS_TRANSLATOR(T)                                          \
  24   translator_listener_record *T::listener_list_;                        \
  25   SCM T::static_description_ = SCM_EOL;                                 \
  26   static void _ ## T ## _adder ()                                       \
  27   {                                                                     \
  28     T *t = new T;                                                       \
  29     T::static_description_ = t->static_translator_description ();       \
  30     scm_permanent_object (T::static_description_);                      \
  31     add_translator (t);                                                 \
  32   }                                                                     \
  33   SCM T::translator_description () const                                \
  34   {                                                                     \
  35     return static_description_;                                         \
  36   }                                                                     \
  37   ADD_GLOBAL_CTOR (_ ## T ## _adder);
  38
  39 #define ADD_TRANSLATOR(classname, desc, grobs, read, write)             \
  40   Drul_array< vector<Acknowledge_information> > classname::acknowledge_static_array_drul_;      \
  41   IMPLEMENT_FETCH_PRECOMPUTABLE_METHODS (classname);                    \
  42   ADD_THIS_TRANSLATOR (classname);                                      \
  43   Engraver_void_function_engraver_grob_info                             \
  44   classname::static_get_acknowledger (SCM sym)                          \
  45   {                                                                     \
  46     return generic_get_acknowledger (sym, &acknowledge_static_array_drul_[START]);      \
  47   }                                                                     \
  48   Engraver_void_function_engraver_grob_info                             \
  49   classname::static_get_end_acknowledger (SCM sym)                              \
  50   {                                                                     \
  51     return generic_get_acknowledger (sym, &acknowledge_static_array_drul_[STOP]);       \
  52   }                                                                     \
  53   SCM                                                                   \
  54   classname::static_translator_description () const                     \
  55   {                                                                     \
  56     return Translator::static_translator_description (grobs, desc, listener_list_, read, write); \
  57   }
  58
  59 #define IMPLEMENT_FETCH_PRECOMPUTABLE_METHODS(T)                        \
  60   void                                                                  \
  61   T::fetch_precomputable_methods (Translator_void_method_ptr ptrs[])    \
  62   {                                                                     \
  63     ptrs[START_TRANSLATION_TIMESTEP] =                                  \
  64       ((Translator_void_method_ptr) & T::start_translation_timestep ==  \
  65        (Translator_void_method_ptr) & Translator::start_translation_timestep) \
  66       ? 0                                                               \
  67       : (Translator_void_method_ptr) & T::start_translation_timestep;   \
  68                                                                         \
  69     ptrs[STOP_TRANSLATION_TIMESTEP] =                                   \
  70       ((Translator_void_method_ptr) & T::stop_translation_timestep == (Translator_void_method_ptr) & Translator::stop_translation_timestep) \
  71       ? 0                                                               \
  72       : (Translator_void_method_ptr) & T::stop_translation_timestep;    \
  73                                                                         \
  74     ptrs[PROCESS_MUSIC] =                                               \
  75       ((Translator_void_method_ptr) & T::process_music == (Translator_void_method_ptr) & Translator::process_music) \
  76       ? 0                                                               \
  77       : (Translator_void_method_ptr) & T::process_music;                \
  78                                                                         \
  79     ptrs[PROCESS_ACKNOWLEDGED] =                                        \
  80       ((Translator_void_method_ptr) & T::process_acknowledged == (Translator_void_method_ptr) & Translator::process_acknowledged) \
  81       ? 0                                                               \
  82       : (Translator_void_method_ptr) & T::process_acknowledged;         \
  83   }
  84
  85 void add_acknowledger (Engraver_void_function_engraver_grob_info ptr,
  86                        char const *func_name,
  87                        vector<Acknowledge_information> *ack_array);
  88
  89 Engraver_void_function_engraver_grob_info
  90 generic_get_acknowledger (SCM sym,
  91                           vector<Acknowledge_information> const *ack_array);
  92
  93 #define ADD_ACKNOWLEDGER(CLASS, NAME)                                   \
  94   void CLASS ## NAME ## _ack_adder ()                                   \
  95   {                                                                     \
  96     add_acknowledger ((Engraver_void_function_engraver_grob_info) & CLASS::acknowledge_ ## NAME, #NAME, &CLASS::acknowledge_static_array_drul_[START]); \
  97   }                                                                     \
  98   ADD_SCM_INIT_FUNC (CLASS ## NAME ## _ack_adder_initclass, CLASS ## NAME ## _ack_adder);
  99
 100 #define ADD_END_ACKNOWLEDGER(CLASS, NAME)                                       \
 101   void CLASS ## NAME ## _end_ack_adder ()                                       \
 102   {                                                                     \
 103     add_acknowledger ((Engraver_void_function_engraver_grob_info) & CLASS::acknowledge_end_ ## NAME, #NAME, &CLASS::acknowledge_static_array_drul_[STOP]); \
 104   }                                                                     \
 105   ADD_SCM_INIT_FUNC (CLASS ## NAME ## _end_ack_adder_initclass, CLASS ## NAME ## _end_ack_adder);
 106
 107 /*
 108   Implement the method cl::listen_##m, and make it listen to stream
 109   events of class m.
 110  */
 111 #define IMPLEMENT_TRANSLATOR_LISTENER(cl, m)            \
 112 void                                                    \
 113 cl :: _internal_declare_ ## m ()                        \
 114 {                                                       \
 115   static translator_listener_record r;                  \
 116   add_translator_listener (&listener_list_, &r, _get_ ## m ## _listener, #m); \
 117 }                                                       \
 118                                                         \
 119 ADD_SCM_INIT_FUNC (cl ## _declare_event_ ## m, cl::_internal_declare_ ## m);    \
 120                                                         \
 121 Listener                                                \
 122 cl :: _get_ ## m ## _listener (void *me)                \
 123 {                                                       \
 124   cl *obj = (cl *) me;                                  \
 125   return obj->GET_LISTENER (_listen_scm_ ## m);         \
 126 }                                                       \
 127                                                         \
 128 IMPLEMENT_LISTENER (cl, _listen_scm_ ## m)              \
 129 void                                                    \
 130 cl::_listen_scm_ ## m (SCM sev)                         \
 131 {                                                       \
 132   Stream_event *ev = unsmob_stream_event (sev);         \
 133   protect_event (sev);                                  \
 134   listen_ ## m (ev);                                    \
 135 }
 136
 137 #endif /* TRANSLATOR_ICC */