57 regels
1.9 KiB
C++
57 regels
1.9 KiB
C++
/*
|
|
* Copyright (c) 2018 Albert S. <mail at quitesimple dot org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
#include "calculationengine.h"
|
|
|
|
|
|
CalculationEngine::CalculationEngine()
|
|
{
|
|
if (!CALCULATOR)
|
|
{
|
|
new Calculator();
|
|
CALCULATOR->terminateThreads();
|
|
CALCULATOR->setPrecision(16);
|
|
}
|
|
|
|
//stolen from krunner's qalculate engine
|
|
/*eo.auto_post_conversion = POST_CONVERSION_BEST;
|
|
eo.keep_zero_units = false;
|
|
|
|
eo.parse_options.angle_unit = ANGLE_UNIT_RADIANS;
|
|
eo.structuring = STRUCTURING_SIMPLIFY;
|
|
|
|
// suggested in https://github.com/Qalculate/libqalculate/issues/16
|
|
// to avoid memory overflow for seemingly innocent calculations (Bug 277011)
|
|
eo.approximation = APPROXIMATION_APPROXIMATE;
|
|
|
|
po.number_fraction_format = FRACTION_DECIMAL;
|
|
po.indicate_infinite_series = false;
|
|
po.use_all_prefixes = false;
|
|
po.use_denominator_prefix = true;
|
|
po.negative_exponents = false;
|
|
po.lower_case_e = true;
|
|
po.base_display = BASE_DISPLAY_NORMAL;*/
|
|
}
|
|
|
|
QString CalculationEngine::evaluate(const QString &expression)
|
|
{
|
|
CALCULATOR->terminateThreads();
|
|
QByteArray ba = expression.toLatin1();
|
|
const char *ctext = ba.data();
|
|
MathStructure result = CALCULATOR->calculate(ctext, this->eo);
|
|
result.format(po);
|
|
return result.print(po).c_str();
|
|
}
|