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/*
* Copyright (c) 2021 Balazs Scheidler <bazsi77@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*/
#include "generic-number.h"
#include <math.h>
gdouble
gn_as_double(const GenericNumber *number)
{
if (number->type == GN_DOUBLE)
return number->value.raw_double;
else if (number->type == GN_INT64)
return (gdouble) number->value.raw_int64;
g_assert_not_reached();
}
void
gn_set_double(GenericNumber *number, gdouble value, gint precision)
{
number->type = GN_DOUBLE;
number->value.raw_double = value;
number->precision = precision > 0 ? precision : 20;
}
gint64
gn_as_int64(const GenericNumber *number)
{
if (number->type == GN_DOUBLE)
{
double r = round(number->value.raw_double);
if (r <= (double) G_MININT64)
return G_MININT64;
if (r >= (double) G_MAXINT64)
return G_MAXINT64;
return (gint64) r;
}
else if (number->type == GN_INT64)
return number->value.raw_int64;
g_assert_not_reached();
}
void
gn_set_int64(GenericNumber *number, gint64 value)
{
number->type = GN_INT64;
number->value.raw_int64 = value;
number->precision = 0;
}
gboolean
gn_is_zero(const GenericNumber *number)
{
if (number->type == GN_INT64)
return number->value.raw_int64 == 0;
if (number->type == GN_DOUBLE)
return fabs(number->value.raw_double) < DBL_EPSILON;
g_assert_not_reached();
}
void
gn_set_nan(GenericNumber *number)
{
number->type = GN_NAN;
}
gboolean
gn_is_nan(const GenericNumber *number)
{
return number->type == GN_NAN || (number->type == GN_DOUBLE && isnan(number->value.raw_double));
}
static gint
_compare_int64(gint64 l, gint64 r)
{
if (l == r)
return 0;
else if (l < r)
return -1;
return 1;
}
static gint
_compare_double(gdouble l, gdouble r)
{
if (fabs(l - r) < DBL_EPSILON)
return 0;
else if (l < r)
return -1;
return 1;
}
gint
gn_compare(const GenericNumber *left, const GenericNumber *right)
{
if (left->type == right->type)
{
if (left->type == GN_INT64)
return _compare_int64(gn_as_int64(left), gn_as_int64(right));
else if (left->type == GN_DOUBLE)
return _compare_double(gn_as_double(left), gn_as_double(right));
}
else if (left->type == GN_NAN || right->type == GN_NAN)
{
;
}
else if (left->type == GN_DOUBLE || right->type == GN_DOUBLE)
{
return _compare_double(gn_as_double(left), gn_as_double(right));
}
else
{
return _compare_int64(gn_as_int64(left), gn_as_int64(right));
}
/* NaNs cannot be compared */
g_assert_not_reached();
}
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