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>
*/
#include "moment.hh"
#include "virtual-methods.hh"
#include "interpretation-context-handle.hh"
+#include "cxx-function-smob.hh"
/**
Conceptually a music-iterator operates on a queue of musical events
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). Side-effects:
+ 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.
thus changing the state of the interpretation context.
get_music (M) -- return all events starting at M (pre: no events
- before M).
+ before M). No side-effects
- skip (M) -- remove 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
+
+ TODO:
+
+ merge pending_moment and process?
+
*/
class Music_iterator
{
+protected:
+ Moment music_length_;
+ Moment start_mom_;
public:
VIRTUAL_COPY_CONS (Music_iterator);
+ Moment music_length_mom () const;
+ Moment music_start_mom () const;
Music_iterator ();
Music_iterator (Music_iterator const&);
virtual ~Music_iterator ();
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.
*/
report to.
*/
virtual void construct_children ();
-
-protected:
- Music * music_l_;
-
+ static SCM constructor_cxx_function;
+
/**
Get an iterator for MUS, inheriting the translation unit from THIS.
*/
virtual Music_iterator* try_music_in_children (Music *) const;
+ Music * music_l () const;
private:
Interpretation_context_handle handle_;
+ Music * music_l_;
};
+
+/*
+ implement Class::constructor, a SCM function that
+ returns an encapsulated factory function.
+ */
+#define IMPLEMENT_CTOR_CALLBACK(Class) \
+static void * \
+Class ## _ctor (SCM) \
+{ \
+ return new Class ; \
+} \
+SCM Class :: constructor_cxx_function;\
+void \
+Class ## _constructor_init () \
+{ \
+ SCM s = smobify_cxx_function (& Class ## _ctor); \
+ scm_permanent_object (s);\
+ gh_define (#Class "::constructor", s);\
+ Class :: constructor_cxx_function = s;\
+}\
+ADD_SCM_INIT_FUNC (Class ## _ctor_init, Class ## _constructor_init);
+
+
+
+
+
+
+
#endif // MUSIC_ITERATOR_HH