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125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/*
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SPDX-FileCopyrightText: 2010 Matteo Agostinelli <agostinelli@gmail.com>
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SPDX-License-Identifier: LGPL-2.0-or-later
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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/Function.h>
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#include <libqalculate/Prefix.h>
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#include <libqalculate/Unit.h>
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#include <libqalculate/Variable.h>
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#include <QApplication>
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#include <QClipboard>
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#include <QDebug>
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#include <QFile>
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#include <KIO/Job>
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#include <KLocalizedString>
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#include <KProtocolManager>
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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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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() << "The exchange rates could not be updated. The following error has been reported:" << 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 QString();
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}
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QString input = expression;
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// Make sure to use toLocal8Bit, the expression can contain non-latin1 characters
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QByteArray ba = input.replace(QChar(0xA3), "GBP").replace(QChar(0xA5), "JPY").replace('$', "USD").replace(QChar(0x20AC), "EUR").toLocal8Bit();
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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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#if defined(QALCULATE_MAJOR_VERSION) && defined(QALCULATE_MINOR_VERSION) \
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&& (QALCULATE_MAJOR_VERSION > 2 || (QALCULATE_MAJOR_VERSION == 2 && QALCULATE_MINOR_VERSION >= 2))
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po.interval_display = INTERVAL_DISPLAY_SIGNIFICANT_DIGITS;
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#endif
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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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