source file of the GNU LilyPond music typesetter
- (c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-
#ifndef MUSIC_ITERATOR_HH
#define MUSIC_ITERATOR_HH
-#include "lily-proto.hh"
-#include "plist.hh"
-#include "array.hh"
+#include "std-vector.hh"
#include "moment.hh"
#include "virtual-methods.hh"
+#include "context-handle.hh"
+
+/**
+ ---
+
+ Music_iterator is an object type that traverses the Music structure and
+ reports the events it finds to interpretation contexts. It is not yet
+ user-serviceable.
+
+
+ ---
+
+ 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.
+
+ * Typically this reports the music to an interpretation context,
+ thus changing the state of the interpretation context.
-class Music_iterator {
- Array<Translator_group*>report_to_l_arr_;
- void push_translator (Translator_group*);
- void pop_translator();
+
+ TODO:
+
+ merge pending_moment and process?
+*/
+class Music_iterator
+{
protected:
- bool first_b_;
- virtual void do_print() const;
-
- virtual Translator_group* get_req_translator_l();
- Music_iterator* get_iterator_p (Music*) const;
- void set_translator (Translator_group*);
- Music_iterator *daddy_iter_l_;
-
+ Moment music_length_;
+ Moment start_mom_;
+
+ DECLARE_CLASSNAME(Music_iterator);
+ DECLARE_SMOBS (Music_iterator);
+ Music_iterator (Music_iterator const &);
+
public:
- Translator_group*report_to_l() const;
- DECLARE_MY_RUNTIME_TYPEINFO;
-
- static Music_iterator* static_get_iterator_p (Music*,Translator_group*);
- Music_iterator();
-
- virtual void process_and_next (Moment until);
- virtual Moment next_moment() const;
- virtual bool ok() const;
- virtual ~Music_iterator();
-
- /**
- Construct sub-iterators, and set the translator to
- report to
- */
- virtual void construct_children();
- void print() const;
+ Moment music_get_length () const;
+ Moment music_start_mom () const;
+ Music_iterator ();
+ void report_event (Music *);
+ Context *get_outlet () const;
+ 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 bool run_always () const;
+ virtual void process (Moment until);
+ virtual void derived_mark () const;
+ virtual void construct_children ();
+ DECLARE_SCHEME_CALLBACK (constructor, ());
+ SCM get_iterator (Music *) const;
+
+ Music *get_music () const;
+protected:
+ virtual void do_quit ();
+ void descend_to_child (Context *);
+
+private:
+ Context_handle handle_;
+ Music *music_;
};
+bool is_child_context (Context *me, Context *child);
+
+#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
projects / lilypond.git / blobdiff