2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
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.
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.
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/>.
23 #include "global-ctor.hh"
24 #include "lily-proto.hh"
25 #include "virtual-methods.hh"
26 #include "callback.hh"
27 #include "input.hh" // for error reporting
29 #include "stream-event.hh"
30 #include "std-vector.hh"
31 #include "protected-scm.hh"
33 #define TRANSLATOR_FAMILY_DECLARATIONS(NAME) \
35 VIRTUAL_COPY_CONSTRUCTOR (Translator, NAME); \
36 virtual void fetch_precomputable_methods (SCM methods[]); \
37 DECLARE_TRANSLATOR_CALLBACKS (NAME); \
38 TRANSLATOR_INHERIT (Translator); \
41 #define TRANSLATOR_INHERIT(BASE) \
42 using BASE::method_finder
44 #define DECLARE_TRANSLATOR_CALLBACKS(NAME) \
45 template <void (NAME::*mf)()> \
46 static SCM method_finder () \
48 return Callback0_wrapper::make_smob<NAME, mf> (); \
50 template <void (NAME::*mf)(Stream_event *)> \
51 static SCM method_finder () \
53 return Callback_wrapper::make_smob<trampoline<NAME, mf> > (); \
55 template <void (NAME::*mf)(Grob_info)> \
56 static SCM method_finder () { \
57 return Callback2_wrapper::make_smob<trampoline <NAME, mf> > (); \
62 Each translator class has a static alist of event class symbols
63 mapping to callbacks that are called with a translator instance and
64 a stream event when an event of the appropriate event class is
65 announced in a context.
68 #define TRANSLATOR_DECLARATIONS(NAME) \
70 TRANSLATOR_FAMILY_DECLARATIONS (NAME); \
71 static Drul_array<Protected_scm> acknowledge_static_array_drul_; \
72 static SCM static_description_; \
73 static Protected_scm listener_list_; \
74 static SCM static_get_acknowledger (SCM sym, Direction start_end); \
75 virtual SCM get_acknowledger (SCM sym, Direction start_end) \
77 return static_get_acknowledger (sym, start_end); \
81 static void boot (); \
82 virtual SCM static_translator_description () const; \
83 virtual SCM translator_description () const; \
84 virtual SCM get_listener_list () const \
86 return listener_list_; \
90 enum Translator_precompute_index
92 START_TRANSLATION_TIMESTEP,
93 STOP_TRANSLATION_TIMESTEP,
96 TRANSLATOR_METHOD_PRECOMPUTE_COUNT,
100 Translate music into grobs.
102 class Translator : public Smob<Translator>
105 int print_smob (SCM, scm_print_state *) const;
106 SCM mark_smob () const;
107 static const char * const type_p_name_;
108 virtual ~Translator ();
110 Context *context () const { return daddy_context_; }
112 Translator (Context *);
113 Translator (Translator const &);
115 SCM internal_get_property (SCM symbol) const;
117 virtual Output_def *get_output_def () const;
118 virtual Translator_group *get_daddy_translator ()const;
119 virtual Moment now_mom () const;
120 virtual bool must_be_last () const;
122 virtual void initialize ();
123 virtual void finalize ();
125 virtual void connect_to_context (Context *c);
126 virtual void disconnect_from_context (Context *c);
128 void stop_translation_timestep ();
129 void start_translation_timestep ();
130 void process_music ();
131 void process_acknowledged ();
133 Context *get_score_context () const;
134 Global_context *get_global_context () const;
136 DECLARE_CLASSNAME (Translator);
137 virtual Translator *clone () const = 0;
138 virtual void fetch_precomputable_methods (SCM methods[]) = 0;
139 virtual SCM get_listener_list () const = 0;
140 virtual SCM translator_description () const = 0;
141 virtual SCM get_acknowledger (SCM sym, Direction start_end) = 0;
143 protected: // should be private.
144 Context *daddy_context_;
145 void protect_event (SCM ev);
147 template <class T, void (T::*callback)(Stream_event *)>
148 static SCM trampoline (SCM target, SCM event)
150 T *t = unsmob<T> (target);
151 LY_ASSERT_SMOB (T, target, 1);
152 LY_ASSERT_SMOB (Stream_event, event, 2);
154 t->protect_event (event);
155 (t->*callback) (unsmob<Stream_event> (event));
156 return SCM_UNSPECIFIED;
159 // Fallback for non-overriden callbacks for which &T::x degrades to
161 template <void (Translator::*)()>
163 method_finder () { return SCM_UNDEFINED; }
165 virtual void derived_mark () const;
166 static SCM event_class_symbol (const char *ev_class);
167 SCM static_translator_description (const char *grobs,
171 const char *write) const;
173 friend class Translator_group;
176 void add_translator (Translator *trans);
178 Translator *get_translator (SCM s);
181 generic_get_acknowledger (SCM sym, SCM ack_hash);
183 Moment get_event_length (Stream_event *s, Moment now);
184 Moment get_event_length (Stream_event *s);
187 This helper is only meaningful inside listen_* methods.
189 extern bool internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function);
190 #define ASSIGN_EVENT_ONCE(o,n) internal_event_assignment (&o, n, __FUNCTION__)
192 #endif // TRANSLATOR_HH