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 "std-vector.hh"
30 #include "protected-scm.hh"
32 #define TRANSLATOR_FAMILY_DECLARATIONS(NAME) \
34 VIRTUAL_COPY_CONSTRUCTOR (Translator, NAME); \
35 virtual void fetch_precomputable_methods (SCM methods[]); \
36 DECLARE_TRANSLATOR_CALLBACKS (NAME); \
37 TRANSLATOR_INHERIT (Translator); \
40 #define TRANSLATOR_INHERIT(BASE) \
41 using BASE::method_finder; \
42 using BASE::ack_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::*callback)(Grob_info)> \
56 static SCM ack_finder () { return ack_find_base<NAME, callback> (); } \
60 Each translator class has a static alist of event class symbols
61 mapping to callbacks that are called with a translator instance and
62 a stream event when an event of the appropriate event class is
63 announced in a context.
66 #define TRANSLATOR_DECLARATIONS(NAME) \
68 TRANSLATOR_FAMILY_DECLARATIONS (NAME); \
69 static Drul_array<Protected_scm> acknowledge_static_array_drul_; \
70 static SCM static_description_; \
71 static Protected_scm listener_list_; \
72 static SCM static_get_acknowledger (SCM sym, Direction start_end); \
73 virtual SCM get_acknowledger (SCM sym, Direction start_end) \
75 return static_get_acknowledger (sym, start_end); \
79 static void boot (); \
80 virtual SCM static_translator_description () const; \
81 virtual SCM translator_description () const; \
82 virtual SCM get_listener_list () const \
84 return listener_list_; \
88 enum Translator_precompute_index
90 START_TRANSLATION_TIMESTEP,
91 STOP_TRANSLATION_TIMESTEP,
94 TRANSLATOR_METHOD_PRECOMPUTE_COUNT,
98 Translate music into grobs.
100 class Translator : public Smob<Translator>
103 int print_smob (SCM, scm_print_state *) const;
104 SCM mark_smob () const;
105 static const char * const type_p_name_;
106 virtual ~Translator ();
111 Context *context () const { return daddy_context_; }
114 Translator (Translator const &);
116 SCM internal_get_property (SCM symbol) const;
118 virtual Output_def *get_output_def () const;
119 virtual Translator_group *get_daddy_translator ()const;
120 virtual Moment now_mom () const;
121 virtual bool must_be_last () const;
123 virtual void initialize ();
124 virtual void finalize ();
126 virtual void connect_to_context (Context *c);
127 virtual void disconnect_from_context (Context *c);
129 void stop_translation_timestep ();
130 void start_translation_timestep ();
131 void process_music ();
132 void process_acknowledged ();
134 Context *get_score_context () const;
135 Global_context *get_global_context () const;
137 DECLARE_CLASSNAME (Translator);
138 virtual Translator *clone () const = 0;
139 virtual void fetch_precomputable_methods (SCM methods[]) = 0;
140 virtual SCM get_listener_list () const = 0;
141 virtual SCM translator_description () const = 0;
142 virtual SCM get_acknowledger (SCM sym, Direction start_end) = 0;
144 protected: // should be private.
145 Context *daddy_context_;
146 void protect_event (SCM ev);
148 template <class T, void (T::*callback)(Stream_event *)>
149 static SCM trampoline (SCM target, SCM event)
151 T *t = unsmob<T> (target);
152 LY_ASSERT_SMOB (T, target, 1);
153 LY_ASSERT_SMOB (Stream_event, event, 2);
155 t->protect_event (event);
156 (t->*callback) (unsmob<Stream_event> (event));
157 return SCM_UNSPECIFIED;
160 // Fallback for non-overriden callbacks for which &T::x degrades to
162 template <void (Translator::*)()>
164 method_finder () { return SCM_UNDEFINED; }
166 // Overriden in Engraver.
167 template <class T, void (T::*callback)(Grob_info)>
169 ack_find_base () { return SCM_UNDEFINED; }
171 template <void (Translator::*)(Grob_info)>
173 ack_finder () { return SCM_UNDEFINED; }
175 virtual void derived_mark () const;
176 static SCM event_class_symbol (const char *ev_class);
177 SCM static_translator_description (const char *grobs,
181 const char *write) const;
183 friend class Translator_group;
186 void add_translator (Translator *trans);
188 Translator *get_translator (SCM s);
191 generic_get_acknowledger (SCM sym, SCM ack_hash);
193 Moment get_event_length (Stream_event *s, Moment now);
194 Moment get_event_length (Stream_event *s);
197 This helper is only meaningful inside listen_* methods.
199 extern bool internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function);
200 #define ASSIGN_EVENT_ONCE(o,n) internal_event_assignment (&o, n, __FUNCTION__)
202 #endif // TRANSLATOR_HH