lily/include/translator.icc

   1 /* -*- c++ -*-
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2015 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 "callback.hh"
  24 #include "std-vector.hh"
  25 #include "engraver.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::boot ();                                                         \
  39     T *t = new T;                                                       \
  40     T::static_description_ =                                            \
  41       scm_permanent_object (t->static_translator_description ());       \
  42     add_translator (t);                                                 \
  43   }                                                                     \
  44   SCM T::translator_description () const                                \
  45   {                                                                     \
  46     return static_description_;                                         \
  47   }                                                                     \
  48   ADD_GLOBAL_CTOR (_ ## T ## _adder);                                   \
  49   /* end define */
  50
  51 #define DEFINE_TRANSLATOR_LISTENER_LIST(T) \
  52   Protected_scm T::listener_list_ (SCM_EOL)
  53
  54 #define DEFINE_ACKNOWLEDGERS(classname) \
  55   Drul_array<Protected_scm> classname::acknowledge_static_array_drul_;  \
  56   SCM                                                                   \
  57   classname::static_get_acknowledger (SCM sym, Direction start_end)     \
  58   {                                                                     \
  59     return generic_get_acknowledger                                     \
  60       (sym, acknowledge_static_array_drul_[start_end]);                 \
  61   }                                                                     \
  62   /* end define */
  63
  64 #define DEFINE_TRANSLATOR_DOC(classname, desc, grobs, read, write)              \
  65   SCM                                                                   \
  66   classname::static_translator_description () const                     \
  67   {                                                                     \
  68     return Translator::static_translator_description (grobs, desc, listener_list_, read, write); \
  69   }
  70
  71 #define ADD_TRANSLATOR(classname, desc, grobs, read, write)             \
  72   IMPLEMENT_FETCH_PRECOMPUTABLE_METHODS (classname);                    \
  73   DEFINE_ACKNOWLEDGERS(classname);                                      \
  74   ADD_THIS_TRANSLATOR (classname);                                      \
  75   DEFINE_TRANSLATOR_DOC(classname, desc, grobs, read, write);           \
  76   DEFINE_TRANSLATOR_LISTENER_LIST(classname);
  77
  78 #define IMPLEMENT_FETCH_PRECOMPUTABLE_METHODS(T)                        \
  79   void                                                                  \
  80   T::fetch_precomputable_methods (SCM ptrs[])                           \
  81   {                                                                     \
  82     ptrs[START_TRANSLATION_TIMESTEP] =                                  \
  83       method_finder <&T::start_translation_timestep> ();                \
  84                                                                         \
  85     ptrs[STOP_TRANSLATION_TIMESTEP] =                                   \
  86       method_finder <&T::stop_translation_timestep> ();                 \
  87                                                                         \
  88     ptrs[PROCESS_MUSIC] =                                               \
  89       method_finder <&T::process_music> ();                             \
  90                                                                         \
  91     ptrs[PROCESS_ACKNOWLEDGED] =                                        \
  92       method_finder <&T::process_acknowledged> ();                      \
  93   }
  94
  95 void add_acknowledger (SCM ptr,
  96                        char const *func_name,
  97                        SCM &ack_hash);
  98
  99 #define ADD_ACKNOWLEDGER(CLASS, NAME)                                   \
 100   add_acknowledger (Callback2_wrapper::make_smob                        \
 101                     <ack_trampoline<CLASS, &CLASS::acknowledge_ ## NAME> > (), \
 102                     #NAME, acknowledge_static_array_drul_[START])
 103
 104 #define ADD_END_ACKNOWLEDGER(CLASS, NAME)                               \
 105   add_acknowledger (Callback2_wrapper::make_smob                        \
 106                     <ack_trampoline<CLASS, &CLASS::acknowledge_end_ ## NAME> > (), \
 107                     #NAME, acknowledge_static_array_drul_[STOP])
 108
 109 /*
 110   Implement the method cl::listen_##m, and make it listen to stream
 111   events of class m.
 112  */
 113 #define ADD_LISTENER(cl, m)                                             \
 114   listener_list_ = scm_acons                                            \
 115     (event_class_symbol (#m),                                           \
 116      Callback_wrapper::make_smob                                        \
 117      <trampoline <cl, &cl::listen_ ## m> > (), listener_list_)
 118
 119 #endif /* TRANSLATOR_ICC */