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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 2010--2015 Joe Neeman <joeneeman@gmail.com>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "context.hh"
#include "dispatcher.hh"
#include "engraver.hh"
#include "grob.hh"
#include "grob-array.hh"
#include "international.hh"
#include "translator.icc"
class Keep_alive_together_engraver: public Engraver
{
vector<Grob *> group_spanners_;
public:
TRANSLATOR_DECLARATIONS (Keep_alive_together_engraver);
void acknowledge_hara_kiri_group_spanner (Grob_info);
virtual void finalize ();
};
Keep_alive_together_engraver::Keep_alive_together_engraver ()
{
}
void
Keep_alive_together_engraver::acknowledge_hara_kiri_group_spanner (Grob_info i)
{
group_spanners_.push_back (i.grob ());
}
void
Keep_alive_together_engraver::finalize ()
{
for (vsize i = 0; i < group_spanners_.size (); ++i)
{
SCM this_layer = group_spanners_[i]->get_property ("remove-layer");
if (scm_is_false (this_layer))
continue;
SCM live_scm = Grob_array::make_array ();
Grob_array *live = unsmob<Grob_array> (live_scm);
SCM dead_scm = Grob_array::make_array ();
Grob_array *dead = unsmob<Grob_array> (dead_scm);
for (vsize j = 0; j < group_spanners_.size (); ++j)
{
if (i == j)
continue;
if (scm_is_symbol (this_layer))
{
if (scm_is_eq (this_layer, ly_symbol2scm ("any")))
{
// layer is kept alive by any other layer
live->add (group_spanners_[j]);
continue;
}
else if (scm_is_eq (this_layer, ly_symbol2scm ("above")))
{
// layer is kept alive by the layer preceding it
if (i == j + 1)
live->add (group_spanners_[j]);
continue;
}
else if (scm_is_eq (this_layer, ly_symbol2scm ("below")))
{
// layer is kept alive by the layer following it
if (i == j - 1)
live->add (group_spanners_[j]);
continue;
}
else
{
group_spanners_[i]->warning (_f ("unknown remove-layer value `%s'",
ly_symbol2string (this_layer).c_str ()));
continue;
}
}
SCM that_layer = group_spanners_[j]->get_property ("remove-layer");
if (scm_is_false (that_layer))
continue;
if (!scm_is_integer (this_layer))
{
// unset layers are kept alive by all but ignored layers
live->add (group_spanners_[j]);
continue;
}
// an explicit layer is only affected by explicit layers
if (!scm_is_integer (that_layer))
continue;
if (scm_is_true (scm_num_eq_p (that_layer, this_layer)))
live->add (group_spanners_[j]);
else if (scm_is_true (scm_less_p (that_layer, this_layer)))
dead->add (group_spanners_[j]);
}
if (!live->empty ())
group_spanners_[i]->set_object ("keep-alive-with", live_scm);
if (!dead->empty ())
group_spanners_[i]->set_object ("make-dead-when", dead_scm);
}
}
void
Keep_alive_together_engraver::boot ()
{
ADD_ACKNOWLEDGER (Keep_alive_together_engraver, hara_kiri_group_spanner);
}
ADD_TRANSLATOR (Keep_alive_together_engraver,
/* doc */
"This engraver collects all @code{Hara_kiri_group_spanner}s "
"that are created in contexts at or below its own. "
"These spanners are then tied together so that one will "
"be removed only if all are removed. For example, "
"if a @code{StaffGroup} uses this engraver, then the staves "
"in the group will all be visible as long as there is a note "
"in at least one of them.",
/* create */
"",
/* read */
"",
/* write */
""
);
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