lily/include/translator.icc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef TRANSLATOR_ICC
  21 #define TRANSLATOR_ICC
  22
  23 #include "listener.hh"
  24 #include "std-vector.hh"
  25 #include "translator.hh"
  26
  27 /*
  28   TODO: derive "foo-bar-interface" from Foo_bar classname.
  29  */
  30
  31 /**
  32    A macro to automate administration of translators.
  33 */
  34 #define ADD_THIS_TRANSLATOR(T)                                          \
  35   SCM T::static_description_ = SCM_EOL;                                 \
  36   static void _ ## T ## _adder ()                                       \
  37   {                                                                     \
  38     T *t = new T;                                                       \
  39     T::static_description_ =                                            \
  40       scm_permanent_object (t->static_translator_description ());       \
  41     add_translator (t);                                                 \
  42   }                                                                     \
  43   SCM T::translator_description () const                                \
  44   {                                                                     \
  45     return static_description_;                                         \
  46   }                                                                     \
  47   ADD_GLOBAL_CTOR (_ ## T ## _adder); \
  48   /* end define */
  49
  50 #define DEFINE_TRANSLATOR_LISTENER_LIST(T) \
  51   translator_listener_record *T::listener_list_;        \
  52   /* end define */
  53
  54 #define DEFINE_ACKNOWLEDGERS(classname) \
  55   Drul_array< vector<Acknowledge_information> > classname::acknowledge_static_array_drul_;      \
  56   Engraver_void_function_engraver_grob_info                             \
  57   classname::static_get_acknowledger (SCM sym)                          \
  58   {                                                                     \
  59     return generic_get_acknowledger (sym, &acknowledge_static_array_drul_[START]);      \
  60   }                                                                     \
  61   Engraver_void_function_engraver_grob_info                             \
  62   classname::static_get_end_acknowledger (SCM sym)                              \
  63   {                                                                     \
  64     return generic_get_acknowledger (sym, &acknowledge_static_array_drul_[STOP]);       \
  65   }                                                                     \
  66   /* end define */
  67
  68 #define DEFINE_TRANSLATOR_DOC(classname, desc, grobs, read, write)              \
  69   SCM                                                                   \
  70   classname::static_translator_description () const                     \
  71   {                                                                     \
  72     return Translator::static_translator_description (grobs, desc, listener_list_, read, write); \
  73   }
  74
  75 #define ADD_TRANSLATOR(classname, desc, grobs, read, write)             \
  76   IMPLEMENT_FETCH_PRECOMPUTABLE_METHODS (classname);                    \
  77   ADD_THIS_TRANSLATOR (classname);                                      \
  78   DEFINE_TRANSLATOR_DOC(classname, desc, grobs, read, write)            \
  79   DEFINE_ACKNOWLEDGERS(classname) \
  80   DEFINE_TRANSLATOR_LISTENER_LIST(classname) \
  81
  82 #define IMPLEMENT_FETCH_PRECOMPUTABLE_METHODS(T)                        \
  83   void                                                                  \
  84   T::fetch_precomputable_methods (Translator_void_method_ptr ptrs[])    \
  85   {                                                                     \
  86     ptrs[START_TRANSLATION_TIMESTEP] =                                  \
  87       ((Translator_void_method_ptr) & T::start_translation_timestep ==  \
  88        (Translator_void_method_ptr) & Translator::start_translation_timestep) \
  89       ? 0                                                               \
  90       : (Translator_void_method_ptr) & T::start_translation_timestep;   \
  91                                                                         \
  92     ptrs[STOP_TRANSLATION_TIMESTEP] =                                   \
  93       ((Translator_void_method_ptr) & T::stop_translation_timestep == (Translator_void_method_ptr) & Translator::stop_translation_timestep) \
  94       ? 0                                                               \
  95       : (Translator_void_method_ptr) & T::stop_translation_timestep;    \
  96                                                                         \
  97     ptrs[PROCESS_MUSIC] =                                               \
  98       ((Translator_void_method_ptr) & T::process_music == (Translator_void_method_ptr) & Translator::process_music) \
  99       ? 0                                                               \
 100       : (Translator_void_method_ptr) & T::process_music;                \
 101                                                                         \
 102     ptrs[PROCESS_ACKNOWLEDGED] =                                        \
 103       ((Translator_void_method_ptr) & T::process_acknowledged == (Translator_void_method_ptr) & Translator::process_acknowledged) \
 104       ? 0                                                               \
 105       : (Translator_void_method_ptr) & T::process_acknowledged;         \
 106   }
 107
 108 void add_acknowledger (Engraver_void_function_engraver_grob_info ptr,
 109                        char const *func_name,
 110                        vector<Acknowledge_information> *ack_array);
 111
 112 Engraver_void_function_engraver_grob_info
 113 generic_get_acknowledger (SCM sym,
 114                           vector<Acknowledge_information> const *ack_array);
 115
 116 #define ADD_ACKNOWLEDGER(CLASS, NAME)                                   \
 117   void CLASS ## NAME ## _ack_adder ()                                   \
 118   {                                                                     \
 119     add_acknowledger ((Engraver_void_function_engraver_grob_info) & CLASS::acknowledge_ ## NAME, #NAME, &CLASS::acknowledge_static_array_drul_[START]); \
 120   }                                                                     \
 121   ADD_SCM_INIT_FUNC (CLASS ## NAME ## _ack_adder_initclass, CLASS ## NAME ## _ack_adder);
 122
 123 #define ADD_END_ACKNOWLEDGER(CLASS, NAME)                                       \
 124   void CLASS ## NAME ## _end_ack_adder ()                                       \
 125   {                                                                     \
 126     add_acknowledger ((Engraver_void_function_engraver_grob_info) & CLASS::acknowledge_end_ ## NAME, #NAME, &CLASS::acknowledge_static_array_drul_[STOP]); \
 127   }                                                                     \
 128   ADD_SCM_INIT_FUNC (CLASS ## NAME ## _end_ack_adder_initclass, CLASS ## NAME ## _end_ack_adder);
 129
 130 /*
 131   Implement the method cl::listen_##m, and make it listen to stream
 132   events of class m.
 133  */
 134 #define IMPLEMENT_TRANSLATOR_LISTENER(cl, m)            \
 135 void                                                    \
 136 cl :: _internal_declare_ ## m ()                        \
 137 {                                                       \
 138   static translator_listener_record r;                  \
 139   add_translator_listener (&listener_list_, &r, _get_ ## m ## _listener, #m); \
 140 }                                                       \
 141                                                         \
 142 ADD_SCM_INIT_FUNC (cl ## _declare_event_ ## m, cl::_internal_declare_ ## m);    \
 143                                                         \
 144 Listener                                                \
 145  cl :: _get_ ## m ## _listener (void *me, SCM unused)   \
 146 {                                                       \
 147   cl *obj = (cl *) me;                                  \
 148   (void) unused; \
 149   return obj->GET_LISTENER (_listen_scm_ ## m);         \
 150 }                                                       \
 151                                                         \
 152 IMPLEMENT_LISTENER (cl, _listen_scm_ ## m)              \
 153 void                                                    \
 154 cl::_listen_scm_ ## m (SCM sev)                         \
 155 {                                                       \
 156   Stream_event *ev = unsmob_stream_event (sev);         \
 157   protect_event (sev);                                  \
 158   listen_ ## m (ev);                                    \
 159 }
 160
 161 #endif /* TRANSLATOR_ICC */