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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 1999--2015 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 "scm-hash.hh"
#include <cassert>
SCM
Scheme_hash_table::make_smob ()
{
return Smob1::make_smob (scm_c_make_hash_table (119));
}
int
Scheme_hash_table::print_smob (SCM p, scm_print_state *) const
{
scm_puts ("#<Scheme_hash_table ", p);
scm_display (hash_tab (), p);
scm_puts ("> ", p);
return 1;
}
bool
Scheme_hash_table::try_retrieve (SCM k, SCM *v)
{
SCM handle = scm_hashq_get_handle (hash_tab (), k);
if (scm_is_pair (handle))
{
*v = scm_cdr (handle);
return true;
}
else
return false;
}
bool
Scheme_hash_table::contains (SCM k) const
{
return scm_is_pair (scm_hashq_get_handle (hash_tab (), k));
}
void
Scheme_hash_table::set (SCM k, SCM v)
{
assert (scm_is_symbol (k));
SCM handle = scm_hashq_create_handle_x (hash_tab (), k, SCM_UNDEFINED);
scm_set_cdr_x (handle, v);
}
SCM
Scheme_hash_table::get (SCM k) const
{
/* SCM_UNDEFINED is the default for unset elements, but
scm_hashq_ref cannot return it, so we do it a bit more awkwardly.
*/
SCM handle = scm_hashq_get_handle (hash_tab (), k);
if (scm_is_pair (handle))
return scm_cdr (handle);
return SCM_UNDEFINED;
}
void
Scheme_hash_table::remove (SCM k)
{
scm_hashq_remove_x (hash_tab (), k);
}
static SCM
collect_handles (void * /* closure */,
SCM key,
SCM value,
SCM result)
{
return scm_acons (key, value, result);
}
SCM
Scheme_hash_table::to_alist () const
{
return scm_internal_hash_fold ((scm_t_hash_fold_fn) &collect_handles,
NULL, SCM_EOL, hash_tab ());
}
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