File indexing completed on 2024-05-05 17:45:01

 /*
     SPDX-FileCopyrightText: 2007 Barış Metin <baris@pardus.org.tr>
     SPDX-FileCopyrightText: 2006 David Faure <faure@kde.org>
     SPDX-FileCopyrightText: 2007 Richard Moore <rich@kde.org>
     SPDX-FileCopyrightText: 2010 Matteo Agostinelli <agostinelli@gmail.com>
     SPDX-FileCopyrightText: 2021 Alexander Lohnau <alexander.lohnau@gmx.de>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include "calculatorrunner.h"
 
 #include "qalculate_engine.h"
 
 #include <QDebug>
 #include <QIcon>
 #include <QMutex>
 #include <QRegularExpression>
 
 #include <KLocalizedString>
 #include <krunner/querymatch.h>
 
 K_PLUGIN_CLASS_WITH_JSON(CalculatorRunner, "plasma-runner-calculator.json")
 
 static QMutex s_initMutex;
 
 CalculatorRunner::CalculatorRunner(QObject *parent, const KPluginMetaData &metaData, const QVariantList &args)
     : Plasma::AbstractRunner(parent, metaData, args)
 {
     setObjectName(QStringLiteral("Calculator"));
 
     QString description = i18n(
         "Calculates the value of :q: when :q: is made up of numbers and "
         "mathematical symbols such as +, -, /, *, ! and ^.");
     addSyntax(Plasma::RunnerSyntax(QStringLiteral(":q:"), description));
     addSyntax(Plasma::RunnerSyntax(QStringLiteral("=:q:"), description));
     addSyntax(Plasma::RunnerSyntax(QStringLiteral(":q:="), description));
 
     m_actions = {new QAction(QIcon::fromTheme(QStringLiteral("edit-copy")), i18n("Copy to Clipboard"), this)};
     setMinLetterCount(2);
 }
 
 CalculatorRunner::~CalculatorRunner()
 {
 }
 
 void CalculatorRunner::userFriendlySubstitutions(QString &cmd)
 {
     if (QLocale().decimalPoint() != QLatin1Char('.')) {
         cmd.replace(QLocale().decimalPoint(), QLatin1String("."), Qt::CaseInsensitive);
     } else if (!cmd.contains(QLatin1Char('[')) && !cmd.contains(QLatin1Char(']'))) {
         // If we are sure that the user does not want to use vectors we can replace this char
         // Especially when switching between locales that use a different decimal separator
         // this ensures that the results are valid, see BUG: 406388
         cmd.replace(QLatin1Char(','), QLatin1Char('.'), Qt::CaseInsensitive);
     }
 }
 
 void CalculatorRunner::match(Plasma::RunnerContext &context)
 {
     const QString term = context.query();
     QString cmd = term;
 
     // no meanless space between friendly guys: helps simplify code
     cmd = cmd.trimmed().remove(QLatin1Char(' '));
 
     if (cmd.length() < 2) {
         return;
     }
 
     if (cmd.toLower() == QLatin1String("universe") || cmd.toLower() == QLatin1String("life")) {
         Plasma::QueryMatch match(this);
         match.setType(Plasma::QueryMatch::PossibleMatch);
         match.setIconName(QStringLiteral("accessories-calculator"));
         match.setText(QStringLiteral("42"));
         match.setData(QStringLiteral("42"));
         match.setId(term);
         context.addMatch(match);
         return;
     }
 
     int base = 10;
     QString customBase;
 
     bool foundPrefix = false; // is there `=` or `hex=` or other base prefix in cmd
 
     int equalSignPosition = cmd.indexOf(QLatin1Char('='));
     if (equalSignPosition != -1 && equalSignPosition != cmd.length() - 1) {
         foundPrefix = QalculateEngine::findPrefix(cmd.left(equalSignPosition), &base, &customBase);
     }
 
     const static QRegularExpression hexRegex(QStringLiteral("0x[0-9a-f]+"), QRegularExpression::CaseInsensitiveOption);
     const bool parseHex = cmd.contains(hexRegex);
     if (!parseHex) {
         userFriendlyMultiplication(cmd);
     }
 
     if (foundPrefix) {
         cmd.remove(0, cmd.indexOf(QLatin1Char('=')) + 1);
     } else if (cmd.endsWith(QLatin1Char('='))) {
         cmd.chop(1);
     } else if (!parseHex) {
         bool foundDigit = false;
         for (int i = 0; i < cmd.length(); ++i) {
             QChar c = cmd.at(i);
             if (c.isLetter() && c != QLatin1Char('!')) {
                 // not just numbers and symbols, so we return
                 return;
             }
             if (c.isDigit()) {
                 foundDigit = true;
             }
         }
         if (!foundDigit) {
             return;
         }
     }
 
     if (cmd.isEmpty()) {
         return;
     }
 
     userFriendlySubstitutions(cmd);
 
     bool isApproximate = false;
     QString result = calculate(cmd, &isApproximate, base, customBase);
     if (!result.isEmpty() && (foundPrefix || result != cmd)) {
         Plasma::QueryMatch match(this);
         match.setType(Plasma::QueryMatch::HelperMatch);
         match.setIconName(QStringLiteral("accessories-calculator"));
         match.setText(result);
         if (isApproximate) {
             match.setSubtext(i18nc("The result of the calculation is only an approximation", "Approximation"));
         }
         match.setData(result);
         match.setId(term);
         match.setActions(m_actions);
         context.addMatch(match);
     }
 }
 
 QString CalculatorRunner::calculate(const QString &term, bool *isApproximate, int base, const QString &customBase)
 {
     {
         QMutexLocker lock(&s_initMutex);
         if (!m_engine) {
             m_engine = std::make_unique<QalculateEngine>();
         }
     }
 
     QString result;
     try {
         result = m_engine->evaluate(term, isApproximate, base, customBase);
     } catch (std::exception &e) {
         qDebug() << "qalculate error: " << e.what();
     }
 
     return result.replace(QLatin1Char('.'), QLocale().decimalPoint(), Qt::CaseInsensitive);
 }
 
 void CalculatorRunner::run(const Plasma::RunnerContext &context, const Plasma::QueryMatch &match)
 {
     if (match.selectedAction()) {
         m_engine->copyToClipboard();
     } else {
         context.requestQueryStringUpdate(match.text(), match.text().length());
     }
 }
 
 QMimeData *CalculatorRunner::mimeDataForMatch(const Plasma::QueryMatch &match)
 {
     QMimeData *result = new QMimeData();
     result->setText(match.text());
     return result;
 }
 
 void CalculatorRunner::userFriendlyMultiplication(QString &cmd)
 {
     // convert multiplication sign to *
     cmd.replace(QChar(U'\u00D7'), QChar('*'));
 
     for (int i = 0; i < cmd.length(); ++i) {
         if (i == 0 || i == cmd.length() - 1) {
             continue;
         }
         const QChar prev = cmd.at(i - 1);
         const QChar current = cmd.at(i);
         const QChar next = cmd.at(i + 1);
         if (current == QLatin1Char('x')) {
             if (prev.isDigit() && (next.isDigit() || next == QLatin1Char(',') || next == QLatin1Char('.'))) {
                 cmd[i] = '*';
             }
         }
     }
 }
 
 #include "calculatorrunner.moc"