/*
- translator.hh -- declare Translator
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TRANSLATOR_HH
#define TRANSLATOR_HH
#include "global-ctor.hh"
-#include "string.hh"
#include "lily-proto.hh"
#include "virtual-methods.hh"
-#include "input.hh"
+#include "callback.hh"
+#include "input.hh" // for error reporting
#include "smobs.hh"
+#include "stream-event.hh"
+#include "std-vector.hh"
+#include "protected-scm.hh"
+
+// The Translator_creator class is only for translators defined in C.
+// Its elements are callable entities taking a context argument and
+// returning a corresponding translator.
+//
+// Other translator-creating entities may be alists and functions returning
+// such alists. Information for those, such as created grobs/properties
+// is attached via object properties.
+
+// Smob rather than Simple_smob since we want an entity for
+// property lookup.
+
+class Translator_creator : public Smob<Translator_creator>
+{
+ Translator_creator (Translator_creator const &); // don't define
+ Translator * (*allocate_)(Context *);
+ template <class T>
+ static Translator *allocate (Context *ctx);
+
+ Translator_creator (Translator * (*allocate)(Context *))
+ : allocate_(allocate)
+ {
+ smobify_self ();
+ }
+public:
+ // This is stupid, but constructors cannot have explicit template
+ // argument lists.
+ template <class T>
+ static Translator_creator *alloc()
+ {
+ return new Translator_creator(&allocate<T>);
+ }
+ SCM call (SCM ctx);
+ LY_DECLARE_SMOB_PROC (&Translator_creator::call, 1, 0, 0);
+};
+template <class T> Translator *
+Translator_creator::allocate (Context *ctx)
+{
+ return new T(ctx);
+}
+
+#define TRANSLATOR_FAMILY_DECLARATIONS(NAME) \
+ public: \
+ DECLARE_CLASSNAME (NAME); \
+ virtual void fetch_precomputable_methods (SCM methods[]); \
+ DECLARE_TRANSLATOR_CALLBACKS (NAME); \
+ TRANSLATOR_INHERIT (Translator); \
+ /* end #define */
+
+#define TRANSLATOR_INHERIT(BASE) \
+ using BASE::method_finder
+
+#define DECLARE_TRANSLATOR_CALLBACKS(NAME) \
+ template <void (NAME::*mf)()> \
+ static SCM method_finder () \
+ { \
+ return Callback0_wrapper::make_smob<NAME, mf> (); \
+ } \
+ template <void (NAME::*mf)(Stream_event *)> \
+ static SCM method_finder () \
+ { \
+ return Callback_wrapper::make_smob<trampoline<NAME, mf> > (); \
+ } \
+ template <void (NAME::*mf)(Grob_info)> \
+ static SCM method_finder () { \
+ return Callback2_wrapper::make_smob<trampoline <NAME, mf> > (); \
+ } \
+ /* end #define */
+/*
+ Each translator class has a static alist of event class symbols
+ mapping to callbacks that are called with a translator instance and
+ a stream event when an event of the appropriate event class is
+ announced in a context.
+*/
-typedef void (*Translator_void_method_ptr)(Translator*);
-
-#define TRANSLATOR_DECLARATIONS(NAME) \
- public: \
- NAME (); \
- VIRTUAL_COPY_CONSTRUCTOR (Translator, NAME); \
- static SCM static_description_; \
- virtual void fetch_precomputable_methods (Translator_void_method_ptr methods[]);\
- virtual SCM static_translator_description () const; \
- virtual SCM translator_description () const;
-
-
-enum Translator_precompute_index {
+#define TRANSLATOR_DECLARATIONS(NAME) \
+ public: \
+ TRANSLATOR_FAMILY_DECLARATIONS (NAME); \
+ static Drul_array<Protected_scm> acknowledge_static_array_drul_; \
+ static Protected_scm listener_list_; \
+ static SCM static_get_acknowledger (SCM sym, Direction start_end); \
+ virtual SCM get_acknowledger (SCM sym, Direction start_end) \
+ { \
+ return static_get_acknowledger (sym, start_end); \
+ } \
+public: \
+ NAME (Context *); \
+ static void boot (); \
+ static SCM static_translator_description (); \
+ virtual SCM get_listener_list () const \
+ { \
+ return listener_list_; \
+ } \
+ /* end #define */
+
+enum Translator_precompute_index
+{
START_TRANSLATION_TIMESTEP,
STOP_TRANSLATION_TIMESTEP,
PROCESS_MUSIC,
TRANSLATOR_METHOD_PRECOMPUTE_COUNT,
};
-/* nothing */
-#define PRECOMPUTED_VIRTUAL
-
-
/*
Translate music into grobs.
*/
-class Translator
+class Translator : public Smob<Translator>
{
- void init ();
-
-protected:
- bool must_be_last_;
-
public:
- bool must_be_last () const;
+ int print_smob (SCM, scm_print_state *) const;
+ SCM mark_smob () const;
+ static const char * const type_p_name_;
+ virtual ~Translator ();
Context *context () const { return daddy_context_; }
- Translator (Translator const &);
+protected:
+ Translator (Context *);
+private:
+ Translator (Translator const &); // not copyable
+public:
SCM internal_get_property (SCM symbol) const;
virtual Output_def *get_output_def () const;
virtual Translator_group *get_daddy_translator ()const;
virtual Moment now_mom () const;
-
- virtual bool try_music (Music *req);
+ virtual bool must_be_last () const;
+
virtual void initialize ();
virtual void finalize ();
- PRECOMPUTED_VIRTUAL void stop_translation_timestep ();
- PRECOMPUTED_VIRTUAL void start_translation_timestep ();
- PRECOMPUTED_VIRTUAL void process_music ();
- PRECOMPUTED_VIRTUAL void process_acknowledged ();
+ virtual void connect_to_context (Context *c);
+ virtual void disconnect_from_context (Context *c);
-
- Score_context *get_score_context () const;
+ void stop_translation_timestep ();
+ void start_translation_timestep ();
+ void process_music ();
+ void process_acknowledged ();
+
+ Context *get_score_context () const;
Global_context *get_global_context () const;
- TRANSLATOR_DECLARATIONS (Translator);
- DECLARE_SMOBS (Translator, dummy);
-protected: // should be private.
+ DECLARE_CLASSNAME (Translator);
+
+ virtual void fetch_precomputable_methods (SCM methods[]) = 0;
+ virtual SCM get_listener_list () const = 0;
+ virtual SCM get_acknowledger (SCM sym, Direction start_end) = 0;
+
+protected: // should be private.
Context *daddy_context_;
- virtual void derived_mark () const;
+ void protect_event (SCM ev);
+
+ template <class T, void (T::*callback)(Stream_event *)>
+ static SCM trampoline (SCM target, SCM event)
+ {
+ T *t = unsmob<T> (target);
+ LY_ASSERT_SMOB (T, target, 1);
+ LY_ASSERT_SMOB (Stream_event, event, 2);
+
+ t->protect_event (event);
+ (t->*callback) (unsmob<Stream_event> (event));
+ return SCM_UNSPECIFIED;
+ }
+
+ // Fallback for non-overriden callbacks for which &T::x degrades to
+ // &Translator::x
+ template <void (Translator::*)()>
+ static SCM
+ method_finder () { return SCM_UNDEFINED; }
- friend class Context_def;
- friend class Context;
+ virtual void derived_mark () const;
+ static SCM event_class_symbol (const char *ev_class);
+ static SCM
+ static_translator_description (const char *grobs,
+ const char *desc,
+ SCM listener_list,
+ const char *read,
+ const char *write);
+
+ friend class Translator_group;
};
-void add_translator (Translator *trans);
-Translator *get_translator (SCM s);
-DECLARE_UNSMOB (Translator, translator);
+SCM
+generic_get_acknowledger (SCM sym, SCM ack_hash);
+
+void add_translator_creator (SCM creator, SCM name, SCM description);
+
+SCM get_translator_creator (SCM s);
+Moment get_event_length (Stream_event *s, Moment now);
+Moment get_event_length (Stream_event *s);
+
+/*
+ This helper is only meaningful inside listen_* methods.
+*/
+extern bool internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function);
+#define ASSIGN_EVENT_ONCE(o,n) internal_event_assignment (&o, n, __FUNCTION__)
+
#endif // TRANSLATOR_HH
projects / lilypond.git / blobdiff