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134 lines
3.9 KiB
134 lines
3.9 KiB
/* |
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* Copyright 2010 Matteo Agostinelli <agostinelli@gmail.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU Library General Public License as |
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* published by the Free Software Foundation; either version 2 or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details |
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* |
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* You should have received a copy of the GNU Library General Public |
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* License along with this program; if not, write to the |
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* Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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*/ |
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#include "qalculate_engine.h" |
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#include <libqalculate/Calculator.h> |
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#include <libqalculate/ExpressionItem.h> |
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#include <libqalculate/Unit.h> |
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#include <libqalculate/Prefix.h> |
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#include <libqalculate/Variable.h> |
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#include <libqalculate/Function.h> |
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#include <QFile> |
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#include <QApplication> |
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#include <QClipboard> |
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#include <QDebug> |
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#include <KLocalizedString> |
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#include <KProtocolManager> |
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#include <KIO/Job> |
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QAtomicInt QalculateEngine::s_counter; |
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QalculateEngine::QalculateEngine(QObject* parent): |
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QObject(parent) |
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{ |
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m_lastResult = ""; |
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s_counter.ref(); |
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if (!CALCULATOR) { |
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new Calculator(); |
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CALCULATOR->terminateThreads(); |
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CALCULATOR->loadGlobalDefinitions(); |
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CALCULATOR->loadLocalDefinitions(); |
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CALCULATOR->loadGlobalCurrencies(); |
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CALCULATOR->loadExchangeRates(); |
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} |
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} |
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QalculateEngine::~QalculateEngine() |
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{ |
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if (s_counter.deref()) { |
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delete CALCULATOR; |
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CALCULATOR = nullptr; |
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} |
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} |
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void QalculateEngine::updateExchangeRates() |
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{ |
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QUrl source = QUrl("http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml"); |
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QUrl dest = QUrl::fromLocalFile(QFile::decodeName(CALCULATOR->getExchangeRatesFileName().c_str())); |
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KIO::Job* getJob = KIO::file_copy(source, dest, -1, KIO::Overwrite | KIO::HideProgressInfo); |
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connect( getJob, &KJob::result, this, &QalculateEngine::updateResult ); |
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} |
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void QalculateEngine::updateResult(KJob* job) |
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{ |
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if (job->error()) { |
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qDebug() << i18n("The exchange rates could not be updated. The following error has been reported: %1",job->errorString()); |
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} else { |
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// the exchange rates have been successfully updated, now load them |
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CALCULATOR->loadExchangeRates(); |
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} |
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} |
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QString QalculateEngine::evaluate(const QString& expression, bool *isApproximate) |
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{ |
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if (expression.isEmpty()) { |
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return ""; |
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} |
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QString input = expression; |
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QByteArray ba = input.replace(QChar(0xA3), "GBP").replace(QChar(0xA5), "JPY").replace('$', "USD").replace(QChar(0x20AC), "EUR").toLatin1(); |
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const char *ctext = ba.data(); |
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CALCULATOR->terminateThreads(); |
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EvaluationOptions eo; |
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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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CALCULATOR->setPrecision(16); |
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MathStructure result = CALCULATOR->calculate(ctext, eo); |
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PrintOptions po; |
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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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result.format(po); |
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m_lastResult = result.print(po).c_str(); |
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if (isApproximate) { |
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*isApproximate = result.isApproximate(); |
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} |
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return m_lastResult; |
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} |
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void QalculateEngine::copyToClipboard(bool flag) |
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{ |
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Q_UNUSED(flag); |
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QApplication::clipboard()->setText(m_lastResult); |
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} |
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