57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018-2019 Albert S. <mail at quitesimple dot org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "calculationengine.h"
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CalculationEngine::CalculationEngine()
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{
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if (!CALCULATOR)
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{
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new Calculator();
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CALCULATOR->terminateThreads();
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CALCULATOR->setPrecision(16);
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}
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//stolen from krunner's qalculate engine
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/*eo.auto_post_conversion = POST_CONVERSION_BEST;
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eo.keep_zero_units = false;
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eo.parse_options.angle_unit = ANGLE_UNIT_RADIANS;
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eo.structuring = STRUCTURING_SIMPLIFY;
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// suggested in https://github.com/Qalculate/libqalculate/issues/16
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// to avoid memory overflow for seemingly innocent calculations (Bug 277011)
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eo.approximation = APPROXIMATION_APPROXIMATE;
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po.number_fraction_format = FRACTION_DECIMAL;
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po.indicate_infinite_series = false;
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po.use_all_prefixes = false;
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po.use_denominator_prefix = true;
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po.negative_exponents = false;
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po.lower_case_e = true;
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po.base_display = BASE_DISPLAY_NORMAL;*/
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}
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QString CalculationEngine::evaluate(const QString &expression)
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{
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CALCULATOR->terminateThreads();
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QByteArray ba = expression.toLatin1();
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const char *ctext = ba.data();
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MathStructure result = CALCULATOR->calculate(ctext, this->eo);
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result.format(po);
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return result.print(po).c_str();
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}
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