src/base/utils/string.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2015  Vladimir Golovnev <glassez@yandex.ru>
   4  * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  * In addition, as a special exception, the copyright holders give permission to
  21  * link this program with the OpenSSL project's "OpenSSL" library (or with
  22  * modified versions of it that use the same license as the "OpenSSL" library),
  23  * and distribute the linked executables. You must obey the GNU General Public
  24  * License in all respects for all of the code used other than "OpenSSL".  If you
  25  * modify file(s), you may extend this exception to your version of the file(s),
  26  * but you are not obligated to do so. If you do not wish to do so, delete this
  27  * exception statement from your version.
  28  */
  29
  30 #include "string.h"
  31
  32 #include <cmath>
  33
  34 #include <QLocale>
  35 #include <QRegularExpression>
  36 #include <QStringList>
  37 #include <QVector>
  38
  39 // to send numbers instead of strings with suffixes
  40 QString Utils::String::fromDouble(const double n, const int precision)
  41 {
  42     /* HACK because QString rounds up. Eg QString::number(0.999*100.0, 'f', 1) == 99.9
  43     ** but QString::number(0.9999*100.0, 'f' ,1) == 100.0 The problem manifests when
  44     ** the number has more digits after the decimal than we want AND the digit after
  45     ** our 'wanted' is >= 5. In this case our last digit gets rounded up. So for each
  46     ** precision we add an extra 0 behind 1 in the below algorithm. */
  47
  48     const double prec = std::pow(10.0, precision);
  49     return QLocale::system().toString(std::floor(n * prec) / prec, 'f', precision);
  50 }
  51
  52 QString Utils::String::wildcardToRegexPattern(const QString &pattern)
  53 {
  54     return QRegularExpression::wildcardToRegularExpression(pattern, QRegularExpression::UnanchoredWildcardConversion);
  55 }
  56
  57 QStringList Utils::String::splitCommand(const QString &command)
  58 {
  59     QStringList ret;
  60     ret.reserve(32);
  61
  62     bool inQuotes = false;
  63     QString tmp;
  64     for (const QChar c : command)
  65     {
  66         if (c == u' ')
  67         {
  68             if (!inQuotes)
  69             {
  70                 if (!tmp.isEmpty())
  71                 {
  72                     ret.append(tmp);
  73                     tmp.clear();
  74                 }
  75
  76                 continue;
  77             }
  78         }
  79         else if (c == u'"')
  80         {
  81             inQuotes = !inQuotes;
  82         }
  83
  84         tmp.append(c);
  85     }
  86
  87     if (!tmp.isEmpty())
  88         ret.append(tmp);
  89
  90     return ret;
  91 }
  92
  93 std::optional<bool> Utils::String::parseBool(const QString &string)
  94 {
  95     if (string.compare(u"true", Qt::CaseInsensitive) == 0)
  96         return true;
  97     if (string.compare(u"false", Qt::CaseInsensitive) == 0)
  98         return false;
  99
 100     return std::nullopt;
 101 }
 102
 103 std::optional<int> Utils::String::parseInt(const QString &string)
 104 {
 105     bool ok = false;
 106     const int result = string.toInt(&ok);
 107     if (ok)
 108         return result;
 109
 110     return std::nullopt;
 111 }
 112
 113 std::optional<double> Utils::String::parseDouble(const QString &string)
 114 {
 115     bool ok = false;
 116     const double result = string.toDouble(&ok);
 117     if (ok)
 118         return result;
 119
 120     return std::nullopt;
 121 }