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"
13 #include "protected-scm.hh"
17 This is a lookahead list for grace notes.
19 { ... X \grace Y Z ... }
21 normally, the ending of X is the start of Z. In case of a grace
22 note, we take off a little at the end of X. What is stored: START
23 (start point of X), LENGTH (length of X), GRACE_START (start_music
24 of Y), and the next fixup element.
26 This is also done for nested musics, i.e.
28 voiceA = \notes { \grace b16 c'2 }
29 voiceB = \notes { c'2 \voiceA }
31 the iterator for voiceB will contain a fixup entry with (START=0/1,
32 LENGTH=2/1, GRACE_START=(0G-1/16) )
34 Graces at the start of a sequential music iterator are handled
35 by initting here_mom_ with Music::start_music (); no fixups are needed.
43 Rational grace_start_;
47 /** Sequential_music iteration: walk each element in turn, and
48 construct an iterator for every element.
51 class Sequential_iterator : public Music_iterator
54 Grace_fixup * grace_fixups_;
56 VIRTUAL_COPY_CONS (Music_iterator);
57 static SCM constructor_cxx_function;
58 Sequential_iterator ();
59 Sequential_iterator (Sequential_iterator const&);
60 virtual ~Sequential_iterator ();
62 virtual void construct_children ();
63 virtual Moment pending_moment () const;
64 virtual bool ok () const;
65 virtual void skip (Moment);
66 virtual SCM get_music (Moment)const;
69 virtual void process (Moment);
70 virtual Music_iterator *try_music_in_children (Music *) const;
74 Music_iterator * iter_p_;
78 virtual void next_element (bool side_effect);
79 virtual void descend_to_child ();
80 virtual SCM get_music_list ()const;
83 #endif /* SEQUENTIAL_ITERATOR_HH */