qsrun/calculationengine.cpp

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1.9 KiB
C++
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2018-01-05 15:52:11 +01:00
/*
* 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.
*/
2018-01-03 09:52:05 +01:00
#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();
}