/*
- music-iterator.hh -- declare Music_iterator
+ 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--2003 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 MUSIC_ITERATOR_HH
#define MUSIC_ITERATOR_HH
-#include "lily-proto.hh"
-#include "array.hh"
+#include "std-vector.hh"
#include "moment.hh"
#include "virtual-methods.hh"
-#include "interpretation-context-handle.hh"
-#include "smobs.hh"
+#include "context-handle.hh"
/**
---
---
-
- Conceptually a music-iterator operates on a queue of musical events
- that are pending. This queue does not actually exist, but it is a
- way of viewing and traversing music-expressions.
-
- ok () -- events left ?
+ Conceptually a music-iterator operates on a queue of musical events
+ that are pending. This queue does not actually exist, but it is a
+ way of viewing and traversing music-expressions.
+
+
+ ok () -- events left ?
- pending_mom () -- time tag of the next event to be processed.
- PRECONDITION: this->ok () holds.
-
- process (M) -- process all at M (Precondition: no events exist
- before M, this->ok () holds). Side-effects:
-
- * This removes all events at M from the pending queue.
+ pending_mom () -- time tag of the next event to be processed.
+ PRECONDITION: ok () holds.
- * Typically this reports the music to an interpretation context,
- thus changing the state of the interpretation context.
+ process (M) -- process all at M (Precondition: no events exist
+ before M, ok () holds). Side-effects:
- get_pending_events (M) -- return all events starting at M (pre: no events
- before M). No side-effects
+ * This removes all events at M from the pending queue.
- skip (M) -- remove all events starting before M (leave the ones that
- start M). no side-effects on interpretation context
+ * Typically this reports the music to an interpretation context,
+ thus changing the state of the interpretation context.
- TODO:
+ TODO:
- merge pending_moment and process?
-
+ merge pending_moment and process?
*/
-class Music_iterator
+class Music_iterator : public Smob<Music_iterator>
{
+public:
+ int print_smob (SCM, scm_print_state *) const;
+ SCM mark_smob () const;
+ static const char * const type_p_name_;
+ virtual ~Music_iterator ();
protected:
Moment music_length_;
Moment start_mom_;
- DECLARE_SMOBS (Music_iterator,dummy);
+ DECLARE_CLASSNAME (Music_iterator);
+private:
+ Music_iterator (Music_iterator const &); // Do not define! Not copyable!
+
public:
- VIRTUAL_COPY_CONS (Music_iterator);
-
Moment music_get_length () const;
+ // music_start_mom () is calculated relative to the time where the
+ // iterator occurs in the music stream, so it will usually be
+ // non-zero only for expressions starting with grace notes.
Moment music_start_mom () const;
Music_iterator ();
- Music_iterator (Music_iterator const&);
-
- /**
- Do the reporting. Will try MUSIC_L_ in its own translator first,
- then its children. Returns the iterator that succeeded
- */
- Music_iterator * try_music (Music *) const;
-
- /**
- The translation unit that we this iterator is reporting to now.
- */
- Translator_group* report_to () const;
-
- void set_translator (Translator_group*);
-
- /** Get an iterator matching the type of MUS, and use TRANS to find
- an accompanying translation unit
- */
- static SCM get_static_get_iterator (Music * mus);
- void init_translator (Music *, Translator_group *);
-void quit ();
-
-
+ void report_event (Music *);
+ virtual Context *get_outlet () const;
+ virtual void set_context (Context *);
+ static SCM get_static_get_iterator (Music *mus);
+ void init_context (Music *, Context *);
+ void quit ();
+ void substitute_outlet (Context *from, Context *to);
+ void descend_to_bottom_context ();
+ virtual void derived_substitute (Context *, Context *);
virtual Moment pending_moment () const;
virtual bool ok () const;
- virtual SCM get_pending_events (Moment until)const;
+ virtual bool run_always () const;
+ // process is called with a time relative to the iterator start, so
+ // usually the last processed moment is the same as music_get_length.
virtual void process (Moment until);
- virtual void skip (Moment until);
- virtual void derived_mark ()const;
+ virtual void derived_mark () const;
virtual void construct_children ();
-
- /**
- Construct sub-iterators, and set the translator to
- report to.
- */
-
- DECLARE_SCHEME_CALLBACK(constructor, ());
-
- /**
- Get an iterator for MUS, inheriting the translation unit from THIS.
- */
+ DECLARE_SCHEME_CALLBACK (constructor, ());
SCM get_iterator (Music *) const;
- virtual Music_iterator* try_music_in_children (Music *) const;
-
- Music * get_music () const;
+ Music *get_music () const;
protected:
- virtual void do_quit();
+ virtual void do_quit ();
+ void descend_to_child (Context *);
+
private:
- Interpretation_context_handle handle_;
- Music * music_;
+ Context_handle handle_;
+ Music *music_;
};
+bool is_child_context (Context *me, Context *child);
-#define IMPLEMENT_CTOR_CALLBACK(Class) \
-LY_DEFINE_MEMBER_FUNCTION(Class,constructor, #Class "::constructor",\
- 0,0,0,\
- (),\
- "Construct a " #Class " music iterator")\
-{ \
- SCM val = (new Class)->self_scm(); \
- scm_gc_unprotect_object (val);\
- return val ; \
-} \
+#define IMPLEMENT_CTOR_CALLBACK(Class) \
+ LY_DEFINE_MEMBER_FUNCTION (Class, constructor, \
+ mangle_cxx_identifier (string (#Class) + "::constructor").c_str(), \
+ 0, 0, 0, \
+ (), \
+ "") \
+ { \
+ Class *c = (new Class); \
+ return c->unprotect (); \
+ }
-DECLARE_UNSMOB(Music_iterator, iterator);
#endif // MUSIC_ITERATOR_HH