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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 1998--2015 Jan Nieuwenhuizen <janneke@gnu.org>
Han-Wen Nienhuys <hanwen@xs4all.nl>
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 "hara-kiri-group-spanner.hh"
#include "paper-column.hh"
#include "pointer-group-interface.hh"
#include "axis-group-interface.hh"
#include "spanner.hh"
#include "warn.hh"
MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, y_extent, 1);
SCM
Hara_kiri_group_spanner::y_extent (SCM smob)
{
Grob *me = unsmob<Grob> (smob);
consider_suicide (me);
return Axis_group_interface::generic_group_extent (me, Y_AXIS);
}
MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, calc_skylines, 1);
SCM
Hara_kiri_group_spanner::calc_skylines (SCM smob)
{
Grob *me = unsmob<Grob> (smob);
consider_suicide (me);
return Axis_group_interface::calc_skylines (smob);
}
MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, pure_height, 3);
SCM
Hara_kiri_group_spanner::pure_height (SCM smob, SCM start_scm, SCM end_scm)
{
Grob *me = unsmob<Grob> (smob);
int start = robust_scm2int (start_scm, 0);
int end = robust_scm2int (end_scm, INT_MAX);
if (request_suicide (me, start, end))
return ly_interval2scm (Interval ());
return ly_interval2scm (Axis_group_interface::pure_group_height (me, start, end));
}
/* there is probably a way that doesn't involve re-implementing a binary
search (I would love some proper closures right now) */
bool find_in_range (SCM vector, int low, int hi, int min, int max)
{
if (low >= hi)
return false;
int mid = low + (hi - low) / 2;
int val = scm_to_int (scm_c_vector_ref (vector, mid));
if (val >= min && val <= max)
return true;
else if (val < min)
return find_in_range (vector, mid + 1, hi, min, max);
return find_in_range (vector, low, mid, min, max);
}
bool
Hara_kiri_group_spanner::request_suicide (Grob *me, int start, int end)
{
extract_grob_set (me, "make-dead-when", foes);
for (vsize i = 0; i < foes.size (); i++)
if (foes[i]->is_live () && !request_suicide_alone (foes[i], start, end))
return true;
if (!request_suicide_alone (me, start, end))
return false;
extract_grob_set (me, "keep-alive-with", friends);
for (vsize i = 0; i < friends.size (); ++i)
if (friends[i]->is_live () && !request_suicide_alone (friends[i], start, end))
return false;
return true;
}
bool
Hara_kiri_group_spanner::request_suicide_alone (Grob *me, int start, int end)
{
if (!to_boolean (me->get_property ("remove-empty")))
return false;
bool remove_first = to_boolean (me->get_property ("remove-first"));
if (!remove_first && start <= 0)
return false;
SCM important = me->get_property ("important-column-ranks");
if (scm_is_vector (important))
{
int len = scm_c_vector_length (important);
if (find_in_range (important, 0, len, start, end))
return false;
}
else /* build the important-columns-cache */
{
extract_grob_set (me, "items-worth-living", worth);
vector<int> ranks;
for (vsize i = 0; i < worth.size (); i++)
{
Interval_t<int> iv = worth[i]->spanned_rank_interval ();
for (int j = iv[LEFT]; j <= iv[RIGHT]; j++)
ranks.push_back (j);
}
vector_sort (ranks, less<int> ());
uniq (ranks);
SCM scm_vec = scm_c_make_vector (ranks.size (), SCM_EOL);
for (vsize i = 0; i < ranks.size (); i++)
scm_vector_set_x (scm_vec, scm_from_int (i), scm_from_int (ranks[i]));
me->set_property ("important-column-ranks", scm_vec);
return request_suicide (me, start, end);
}
return true;
}
void
Hara_kiri_group_spanner::consider_suicide (Grob *me)
{
Spanner *sp = dynamic_cast<Spanner *> (me);
int left = 0;
int right = INT_MAX;
if (Item *l = sp->get_bound (LEFT))
left = l->get_column ()->get_rank ();
if (Item *r = sp->get_bound (RIGHT))
right = r->get_column ()->get_rank ();
if (!request_suicide (me, left, right))
return;
vector<Grob *> childs;
Axis_group_interface::get_children (me, &childs);
for (vsize i = 0; i < childs.size (); i++)
childs[i]->suicide ();
/*
very appropriate name here :-)
*/
me->suicide ();
}
/*
We can't rely on offsets and dimensions of elements in a hara-kiri
group. Use a callback to make sure that hara-kiri has been done
before asking for offsets. */
MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, force_hara_kiri_callback, 1);
SCM
Hara_kiri_group_spanner::force_hara_kiri_callback (SCM smob)
{
Grob *me = unsmob<Grob> (smob);
consider_suicide (me);
return scm_from_double (0.0);
}
MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, force_hara_kiri_in_y_parent_callback, 1);
SCM
Hara_kiri_group_spanner::force_hara_kiri_in_y_parent_callback (SCM smob)
{
Grob *daughter = unsmob<Grob> (smob);
force_hara_kiri_callback (daughter->get_parent (Y_AXIS)->self_scm ());
return scm_from_double (0.0);
}
void
Hara_kiri_group_spanner::add_interesting_item (Grob *me, Grob *n)
{
Pointer_group_interface::add_unordered_grob (me, ly_symbol2scm ("items-worth-living"), n);
}
ADD_INTERFACE (Hara_kiri_group_spanner,
"A group spanner that keeps track of interesting items. If it"
" doesn't contain any after line breaking, it removes itself"
" and all its children. Greater control can be exercised via"
" @code{remove-layer} which can prioritize layers so only the"
" lowest-numbered non-empty layer is retained; make the layer"
" independent of the group; or make it dependent on any other"
" member of the group",
/* properties */
"items-worth-living "
"important-column-ranks "
"keep-alive-with "
"make-dead-when "
"remove-empty "
"remove-first "
"remove-layer "
);
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