2 sequential-iterator.hh -- declare Sequential_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #ifndef SEQUENTIAL_ITERATOR_HH
10 #define SEQUENTIAL_ITERATOR_HH
12 #include "music-iterator.hh"
16 This is a lookahead list for grace notes.
18 { ... X \grace Y Z ... }
20 normally, the ending of X is the start of Z. In case of a grace
21 note, we take off a little at the end of X. What is stored: START
22 (start point of X), LENGTH (length of X), GRACE_START (start_music
23 of Y), and the next fixup element.
25 This is also done for nested musics, i.e.
27 voiceA = \notes { \grace b16 c'2 }
28 voiceB = \notes { c'2 \voiceA }
30 the iterator for voiceB will contain a fixup entry with (START=0/1,
31 LENGTH=2/1, GRACE_START=(0G-1/16) )
33 Graces at the start of a sequential music iterator are handled
34 by initting here_mom_ with Music::start_music (); no fixups are needed.
42 Rational grace_start_;
46 /** Sequential_music iteration: walk each element in turn, and
47 construct an iterator for every element.
50 class Sequential_iterator : public Music_iterator
53 Grace_fixup * grace_fixups_;
55 VIRTUAL_COPY_CONS (Music_iterator);
56 static SCM constructor_cxx_function;
57 Sequential_iterator ();
58 Sequential_iterator (Sequential_iterator const&);
59 virtual ~Sequential_iterator ();
61 virtual void construct_children ();
62 virtual Moment pending_moment () const;
63 virtual bool ok () const;
64 virtual void skip (Moment);
65 virtual SCM get_music (Moment)const;
68 virtual void process (Moment);
69 virtual Music_iterator *try_music_in_children (Music *) const;
73 Music_iterator * iter_p_;
76 virtual void next_element (bool side_effect);
77 virtual void descend_to_child ();
78 virtual SCM get_music_list ()const;
81 #endif /* SEQUENTIAL_ITERATOR_HH */