source file of the GNU LilyPond music typesetter
- (c) 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2001 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_ = 0;
- here_mom_ = 0;
+ cursor_ = SCM_EOL;
+ here_mom_ = Moment (0);
+ grace_skips_ = 0;
iter_p_ =0;
- per_elt_b_ = false;
}
-void
-Sequential_music_iterator::construct_children()
+Sequential_music_iterator::Sequential_music_iterator (Sequential_music_iterator const &src)
+ : Music_iterator (src)
{
- cursor_ = dynamic_cast<Music_sequence const*> (music_l_)->music_p_list_p_->head_;
+ grace_skips_ = src.grace_skips_;
+ cursor_ = src.cursor_;
+ here_mom_ = src.here_mom_;
+ if (src.iter_p_)
+ iter_p_ = src.iter_p_->clone ();
+ else
+ iter_p_ = 0;
+}
+
+Sequential_music_iterator::~Sequential_music_iterator ()
+{
+ delete iter_p_;
+}
+
+
+Grace_skip *
+get_grace_skips (SCM cursor)
+{
+ Moment here (0);
+ Moment last (here);
+ Grace_skip *head = 0;
+ Grace_skip **tail = &head;
+ bool first = true;
+
- while (cursor_)
+ for (; gh_pair_p (cursor); cursor = gh_cdr (cursor))
{
- start_next_element();
- if (!iter_p_->ok())
+ Music * mus = unsmob_music (gh_car (cursor));
+ Moment l =mus->length_mom ();
+ if (l.main_part_)
{
- leave_element();
+ first = false;
+ last = here;
+ here += l;
}
- else
+ else if(l.grace_mom_ && !first)
{
- set_sequential_music_translator();
- break;
+ assert (!l.main_part_);
+ Grace_skip *p =new Grace_skip;
+ p->start_ = last;
+ p->length_ = (here - last).main_part_;
+ p->grace_length_ = l.grace_mom_;
+ p->next_ = 0;
+ *tail = p;
+ tail = &(*tail)->next_;
}
}
+ return head;
}
-void
-Sequential_music_iterator::leave_element()
+void
+Sequential_music_iterator::construct_children ()
{
- delete iter_p_;
- iter_p_ =0;
- Moment elt_time = cursor_->car_->length_mom ();
- here_mom_ += elt_time;
- cursor_ =cursor_->next_;
+ 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 ();
+ }
+
+ grace_skips_ = get_grace_skips (cursor_);
+
+ here_mom_ = music_l ()->start_mom ();
+
+ /*
+ 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::start_next_element()
+Sequential_music_iterator::next_element ()
{
- assert (!iter_p_);
- iter_p_ = get_iterator_p (cursor_->car_);
+ Moment len =iter_p_->music_length_mom ();
+ Moment start = iter_p_->music_start_mom ();
+ assert (!grace_skips_ || grace_skips_->start_ >= here_mom_);
+
+ if (len.main_part_ && grace_skips_ && grace_skips_->start_ == here_mom_)
+ {
+ Moment sk;
+ sk.main_part_ = grace_skips_->length_;
+ here_mom_ += sk;
+ here_mom_.grace_mom_ = - grace_skips_->grace_length_;
+
+ Grace_skip * n =grace_skips_->next_;
+ delete grace_skips_;
+ grace_skips_ = n;
+ }
+ else if (len.grace_mom_)
+ {
+ here_mom_.grace_mom_ =0;
+ }
+ else
+ {
+ here_mom_ += len - start;
+ }
+
+ 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;
}
+/*
+ move to context of child iterator if it is deeper down in the
+ hierarchy.
+ */
+
void
-Sequential_music_iterator::set_sequential_music_translator()
+Sequential_music_iterator::descend_to_child ()
{
- if (iter_p_->report_to_l()->depth_i () > report_to_l ()->depth_i ()
- && ! dynamic_cast<Grace_iterator*> (iter_p_)) // UGH.!
- set_translator (iter_p_->report_to_l());
-}
+ Translator_group * child_report = child_report = iter_p_->report_to_l ();
+ Translator_group * me_report = report_to_l ();
-Sequential_music_iterator::~Sequential_music_iterator()
-{
- assert (! iter_p_);
+ Translator_group * c = child_report;
+ while (c && c != me_report)
+ {
+ c= c->daddy_trans_l_;
+ }
+
+ if (c == me_report)
+ 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
-void
-Sequential_music_iterator::do_process_and_next (Moment 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
{
- if (!iter_p_)
- return;
+ SCM s = SCM_EOL;
+ if (until < pending_moment ())
+ return s;
- while (1)
+ Sequential_music_iterator * me =
+ dynamic_cast<Sequential_music_iterator*> (clone ());
+ while (me->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);
- }
+ SCM nm = me->iter_p_->get_music (until - me->here_mom_);
+ s = gh_append2 (nm, s);
- if (!iter_p_->ok())
- {
- leave_element();
-
- if (cursor_)
- {
- start_next_element();
- set_sequential_music_translator();
-
- if (per_elt_b_)
- goto loopexit; // ugh.
- }
- else
- {
- goto loopexit;
- }
- }
- }
+ Moment m = 0;
+ for (SCM i = nm; gh_pair_p (i); i = gh_cdr (i))
+ m = m >? unsmob_music (gh_car (i))->length_mom ();
-loopexit:
-
- Music_iterator::do_process_and_next (until);
+ if (m > Moment (0))
+ break ;
+ else
+ me->next_element ();
+ }
+ delete me;
+
+ return s;
}
-
-Moment
-Sequential_music_iterator::next_moment() const
+/*
+ Skip events till UNTIL. We don't do any other side effects such as
+ descending to child iterator contexts, because they might depend on
+ \context specs and \translator changes being executed
+
+ */
+void
+Sequential_music_iterator::skip (Moment until)
{
- return iter_p_->next_moment() + here_mom_;
+ while (ok ())
+ {
+ 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 ();
+ }
}
-Music*
-Sequential_music_iterator::next_music_l ()
+void
+Sequential_music_iterator::process (Moment until)
{
- if (!iter_p_)
- return 0;
-
- while (1)
+ while (iter_p_)
{
- if (Music* m = iter_p_->next_music_l ())
+ if (grace_skips_ &&
+ grace_skips_->start_ == here_mom_
+ && (grace_skips_->start_ + grace_skips_->length_).main_part_ ==
+ until.main_part_)
{
- return m;
+ /*
+ do the stuff/note/rest preceding a grace.
+ */
+ Moment u = until;
+ u.grace_mom_ = 0;
+ iter_p_->process (u - here_mom_);
}
else
- {
- // urg FIXME: grace-iterator::next_music_l () fools me!
- if (dynamic_cast<Grace_iterator*> (iter_p_))
- iter_p_ = 0;
- leave_element ();
+ iter_p_->process (until - here_mom_ + iter_p_->music_start_mom ());
+
+ /*
+ if the iter is still OK, there must be events left that have
+
+ TIME > LEFT
- if (cursor_)
- {
- start_next_element ();
- set_sequential_music_translator ();
- }
- else
- {
- delete iter_p_;
- iter_p_ = 0;
- return 0;
- }
- }
+ */
+ if (iter_p_->ok ())
+ return ;
+
+ descend_to_child ();
+ next_element ();
}
}
+Moment
+Sequential_music_iterator::pending_moment () const
+{
+ Moment cp = iter_p_->pending_moment ();
+
+ if (grace_skips_
+ && here_mom_ == grace_skips_->start_
+ && cp.main_part_ >= grace_skips_->length_)
+ {
+ cp += here_mom_ ;
+ cp.grace_mom_ = - grace_skips_->grace_length_;
+ return cp;
+ }
+ else
+ return cp + here_mom_ - iter_p_->music_start_mom ();
+}
+
+
bool
-Sequential_music_iterator::ok() const
+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;
+}
+IMPLEMENT_CTOR_CALLBACK (Sequential_music_iterator);
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