Warning, file /education/kmplot/kmplot/constants.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     KmPlot - a math. function plotter for the KDE-Desktop
 
     SPDX-FileCopyrightText: 1998, 1999, 2000, 2002 Klaus-Dieter Möller <kd.moeller@t-online.de>
     SPDX-FileCopyrightText: 2006 David Saxton <david@bluehaze.org>
 
     This file is part of the KDE Project.
     KmPlot is part of the KDE-EDU Project.
 
     SPDX-License-Identifier: GPL-2.0-or-later
 
 */
 
 #include "constants.h"
 #include "xparser.h"
 
 #include <KConfig>
 
 // BEGIN class Constant
 Constant::Constant()
 {
     // By default, have both types
     // This minimizes loss of information
     type = Document | Global;
 }
 // END class Constant
 
 // BEGIN class Constants
 Constants::Constants()
 {
 }
 
 Constants::~Constants()
 {
 }
 
 Value Constants::value(const QString &name) const
 {
     return m_constants[name].value;
 }
 
 bool Constants::have(const QString &name) const
 {
     return m_constants.contains(name);
 }
 
 void Constants::remove(const QString &name)
 {
     if (m_constants.remove(name) > 0)
         emit constantsChanged();
 }
 
 void Constants::add(const QString &name, const Constant &constant)
 {
     m_constants[name] = constant;
     emit constantsChanged();
 }
 
 ConstantList Constants::list(int type) const
 {
     ConstantList list;
 
     for (ConstantList::const_iterator it = m_constants.begin(); it != m_constants.end(); ++it) {
         if (type & it.value().type)
             list.insert(it.key(), it.value());
     }
 
     return list;
 }
 
 bool Constants::isValidName(const QString &name) const
 {
     // Don't allow empty names
     if (name.isEmpty())
         return false;
 
     // Don't allow constants names that are already used by a function
     if (XParser::self()->predefinedFunctions(true).contains(name) || XParser::self()->userFunctions().contains(name))
         return false;
 
     // special cases: don't allow predefined constants either
     if (name == QLatin1String("pi") || name == PiSymbol || name == QLatin1String("e") || name == InfinitySymbol)
         return false;
 
     // Now make sure that the constant name contains only letters
     for (int i = 0; i < name.length(); ++i) {
         if (!name.at(i).isLetter())
             return false;
     }
 
     // All ok!
     return true;
 }
 
 QString Constants::generateUniqueName() const
 {
     QString name;
     int at = 0;
     while (true) {
         at++;
         name.resize(at);
         for (char c = 'A'; c <= 'Z'; ++c) {
             name[at - 1] = c;
             if (isValidName(name) && !have(name))
                 return name;
         }
     }
 }
 
 void Constants::load()
 {
     /// \todo Need more robust way of exchanging constants with kcalc
 
     KConfig conf(QStringLiteral("kcalcrc"), KConfig::SimpleConfig);
     KConfigGroup group = conf.group("UserConstants");
     QString tmp;
 
     for (int i = 0;; i++) {
         tmp.setNum(i);
         QString name = group.readEntry("nameConstant" + tmp, QStringLiteral(" "));
         QString expression = group.readEntry("expressionConstant" + tmp, QStringLiteral(" "));
         QString value = group.readEntry("valueConstant" + tmp, QStringLiteral(" "));
 
         if (name == QLatin1String(" "))
             return;
 
         if (name.isEmpty())
             continue;
 
         if (expression == QLatin1String(" ")) {
             // Old config file
             expression = value;
         }
 
         if (!isValidName(name) || have(name))
             name = generateUniqueName();
 
         Constant constant;
         constant.value = expression;
         constant.type = Constant::Global;
 
         add(name, constant);
     }
 }
 
 void Constants::save()
 {
     KConfig conf(QStringLiteral("kcalcrc"), KConfig::SimpleConfig);
     conf.deleteGroup("Constants");
 
     // remove any previously saved constants
     conf.deleteGroup("UserConstants");
 
     KConfigGroup group = conf.group("UserConstants");
     QString tmp;
 
     ConstantList global = list(Constant::Global);
 
     int i = 0;
     for (ConstantList::iterator it = global.begin(); it != global.end(); ++it) {
         tmp.setNum(i);
         group.writeEntry("nameConstant" + tmp, it.key());
         group.writeEntry("expressionConstant" + tmp, it.value().value.expression());
         group.writeEntry("valueConstant" + tmp, it.value().value.value());
 
         i++;
     }
 }
 // END class Constants