source file of the GNU LilyPond music typesetter
- (c) 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
-
+#include "grace-iterator.hh"
#include "translator-group.hh"
#include "debug.hh"
#include "sequential-music-iterator.hh"
#include "music-list.hh"
+#include "request-chord-iterator.hh"
+
+/*
+ Invariant for the data structure.
+
+
+ if (gh_pair_p (cursor_))
+ iter_p_->music_l_ == unsmob_music (gh_car (cursor_))
+ else
+ iter_p_ == 0;
+
+ The length of musiclist from start to up to cursor_ (cursor_ not
+ including), is summed
+
+ here_mom_ = sum (length (musiclist [start ... cursor> )) %)
+
+ */
-void
-Sequential_music_iterator::do_print() const
-{
- if (iter_p_)
- iter_p_->print();
-}
Sequential_music_iterator::Sequential_music_iterator ()
{
- cursor_p_ = 0;
- here_mom_ = 0;
+ cursor_ = SCM_EOL;
+ here_mom_ = Moment (0);
+
iter_p_ =0;
}
-void
-Sequential_music_iterator::construct_children()
+Sequential_music_iterator::Sequential_music_iterator (Sequential_music_iterator const &src)
+ : Music_iterator (src)
{
- cursor_p_ = new PCursor<Music*> (dynamic_cast<Sequential_music const*> (music_l_)->music_p_list_p_->top ());
-
- while (cursor_p_->ok())
- {
- start_next_element();
- if (!iter_p_->ok())
- {
- leave_element();
- }
- else
- {
- set_Sequential_music_translator();
- break;
- }
- }
+ cursor_ = src.cursor_;
+ here_mom_ = src.here_mom_;
+ if (src.iter_p_)
+ iter_p_ = src.iter_p_->clone ();
+ else
+ iter_p_ = 0;
}
-void
-Sequential_music_iterator::leave_element()
+Sequential_music_iterator::~Sequential_music_iterator()
{
delete iter_p_;
- iter_p_ =0;
- Moment elt_time = cursor_p_->ptr()->duration ();
- here_mom_ += elt_time;
- cursor_p_->next();
}
void
-Sequential_music_iterator::start_next_element()
+Sequential_music_iterator::construct_children()
{
- assert (!iter_p_);
- iter_p_ = get_iterator_p ( cursor_p_->ptr());
+ cursor_ = dynamic_cast<Music_sequence const*> (music_l_)->music_list ();
+
+ iter_p_ = gh_pair_p (cursor_) ? get_iterator_p (unsmob_music (gh_car (cursor_))) : 0;
+ while (iter_p_ && !iter_p_->ok ())
+ {
+ next_element ();
+ }
+
+ /*
+ iter_p_->ok () is tautology, but what the heck.
+ */
+ if (iter_p_ && iter_p_->ok())
+ descend_to_child ();
+
}
+
+/*
+ maintain invariants: change cursor, iter and here_mom_ in one fell
+ swoop.
+*/
void
-Sequential_music_iterator::set_Sequential_music_translator()
+Sequential_music_iterator::next_element ()
{
- if (iter_p_->report_to_l()->depth_i () > report_to_l ()->depth_i ())
- set_translator (iter_p_->report_to_l());
+ here_mom_ += iter_p_->music_length_mom ();
+ delete iter_p_;
+ cursor_ = gh_cdr (cursor_);
+
+ if (gh_pair_p (cursor_))
+ iter_p_ = get_iterator_p (unsmob_music (gh_car (cursor_)));
+ else
+ iter_p_ = 0;
}
-Sequential_music_iterator::~Sequential_music_iterator()
+/*
+ move to context of child iterator if it is deeper down in the
+ hierarchy.
+ */
+
+void
+Sequential_music_iterator::descend_to_child ()
{
- delete cursor_p_;
- assert (! iter_p_);
+ Translator_group * child_report = child_report = iter_p_->report_to_l ();
+ if (dynamic_cast<Grace_iterator*> (iter_p_))
+ child_report = child_report->daddy_trans_l_;
+
+ if (report_to_l()->depth_i () < child_report->depth_i ())
+ set_translator (child_report);
}
+/*
+ Retrieve all music (starting at HERE), until a music with length L >
+ 0 is found. From the precondition, we know that UNTIL is later than
+ the earliest event. Hence we know
+
+ L >= (UNTIL - HERE)
+ so something that comes after this thing with L > 0 happens after
+ HERE + L >= HERE + (UNTIL - HERE) = UNTIL
+
+ Hence all events after the one with L>0 are uninteresting, so we
+ ignore them.
+
+*/
+
+SCM
+Sequential_music_iterator::get_music (Moment until)const
+{
+ SCM s = SCM_EOL;
+ if (until < pending_moment ())
+ return s;
+
+ Sequential_music_iterator * me =
+ dynamic_cast<Sequential_music_iterator*> (clone ());
+ while (me->ok ())
+ {
+ SCM nm = me->iter_p_->get_music (until - me->here_mom_);
+ s = gh_append2 (nm, s);
+
+ Moment m = 0;
+ for (SCM i = nm; gh_pair_p(i); i = gh_cdr (i))
+ m = m >? unsmob_music (gh_car (i))->length_mom ();
+
+ if (m > Moment (0))
+ break ;
+ else
+ me->next_element ();
+ }
+ delete me;
+
+ return s;
+}
+/*
+ Skip events till UNTIL. We don't do any other side effects (such as
+ moving descending to child iterator contexts, because they might
+ depend on \context specs and \translator changes being executed
+
+ */
void
-Sequential_music_iterator::do_process_and_next (Moment until)
+Sequential_music_iterator::skip (Moment until)
{
- while (1)
+ while (ok ())
{
- Moment local_until = until - here_mom_;
- while (iter_p_->ok())
- {
- Moment here = iter_p_->next_moment();
- if (here != local_until)
- goto loopexit;
-
- iter_p_->process_and_next (local_until);
- }
-
- if (!iter_p_->ok())
- {
- leave_element();
-
- if (cursor_p_->ok())
- {
- start_next_element();
- set_Sequential_music_translator();
- }
- else
- {
- goto loopexit;
- }
- }
+ Moment l =iter_p_->music_length_mom ();
+ if (l >= until - here_mom_)
+ iter_p_->skip (until - here_mom_);
+
+ if (iter_p_->ok ())
+ return ;
+
+ next_element ();
}
+}
+
+void
+Sequential_music_iterator::process (Moment until)
+{
+ while (iter_p_)
+ {
+ iter_p_->process (until - here_mom_);
-loopexit:
+ /*
+ if the iter is still OK, there must be events left that have
+
+ TIME > LEFT
+
+ */
+ if (iter_p_->ok ())
+ return ;
- Music_iterator::do_process_and_next (until);
+ descend_to_child ();
+ next_element ();
+ }
}
Moment
-Sequential_music_iterator::next_moment() const
+Sequential_music_iterator::pending_moment() const
{
- return iter_p_->next_moment() + here_mom_;
+ return iter_p_->pending_moment() + here_mom_;
}
+
bool
Sequential_music_iterator::ok() const
{
return iter_p_;
}
+Music_iterator*
+Sequential_music_iterator::try_music_in_children (Music *m) const
+{
+ return iter_p_ ? iter_p_->try_music (m) : 0;
+}
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