source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#ifndef SEQUENTIAL_MUSIC_ITERATOR_HH
#include "music-iterator.hh"
+
+/*
+
+ This is a lookahead list for grace notes.
+
+ { ... X \grace Y Z ... }
+
+ normally, the ending of X is the start of Z. In case of a grace
+ note, we take off a little at the end of X. What is stored: START
+ (start point of X), LENGTH (length of X), GRACE_START (start_music
+ of Y), and the next fixup element.
+
+ This is also done for nested musics, i.e.
+
+ voiceA = \notes { \grace b16 c'2 }
+ voiceB = \notes { c'2 \voiceA }
+
+ the iterator for voiceB will contain a fixup entry with (START=0/1,
+ LENGTH=2/1, GRACE_START=(0G-1/16) )
+
+ Graces at the start of a sequential music iterator are handled
+ by initting here_mom_ with Music::start_music (); no fixups are needed.
+
+*/
+struct Grace_fixup
+{
+ Moment start_;
+ Moment length_;
+
+ Rational grace_start_;
+ Grace_fixup *next_;
+};
+
/** Sequential_music iteration: walk each element in turn, and
construct an iterator for every element.
class Sequential_music_iterator : public Music_iterator
{
public:
+ Grace_fixup * grace_fixups_;
+
VIRTUAL_COPY_CONS (Music_iterator);
+ static SCM constructor_cxx_function;
Sequential_music_iterator ();
Sequential_music_iterator (Sequential_music_iterator const&);
virtual ~Sequential_music_iterator ();
virtual void construct_children ();
- virtual Moment next_moment () const;
+ virtual Moment pending_moment () const;
virtual bool ok () const;
- virtual Music* get_music ();
- virtual bool next ();
+ virtual void skip (Moment);
+ virtual SCM get_music (Moment)const;
protected:
- virtual void do_print() const;
- virtual void do_process_and_next (Moment);
+ virtual void process (Moment);
virtual Music_iterator *try_music_in_children (Music *) const;
-
private:
Moment here_mom_;
-
SCM cursor_;
Music_iterator * iter_p_;
- /*
- perhaps these can be virtual and protected iso. private?
- */
- void start_next_element();
- void leave_element();
- void set_sequential_music_translator();
+ void next_element ();
+ void descend_to_child ();
};
#endif // SEQUENTIAL_MUSIC_ITERATOR_HH