File indexing completed on 2024-11-24 04:52:56

 /* Copyright (C) 2006 - 2014 Jan Kundrát <jkt@flaska.net>
    Copyright (C) 2018 Erik Quaeghebeur <kde@equaeghe.nospammail.net>
 
    This file is part of the Trojita Qt IMAP e-mail client,
    http://trojita.flaska.net/
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of
    the License or (at your option) version 3 or any later version
    accepted by the membership of KDE e.V. (or its successor approved
    by the membership of KDE e.V.), which shall act as a proxy
    defined in Section 14 of version 3 of the license.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <QObject>
 #include <QRegularExpression>
 #include <QRegularExpressionMatchIterator>
 #include <QStringList>
 
 #include "SubjectMangling.h"
 
 namespace Composer {
 namespace Util {
 
 /** @short Prepare a subject to be used in a reply message */
 QString replySubject(const QString &subject)
 {
     // These operations should *not* check for internationalized variants of "Re"; these are evil.
     static const QRegularExpression rePrefixMatcher(QLatin1String(
                               /* initial whitespace */ "\\s*"
                   /* either Re: or mailing list tag */ "(?:Re:|(\\[.+?\\]))"
                         /* repetitions of the above */ "(?:\\s|Re:|\\1)*"),
                                               QRegularExpression::CaseInsensitiveOption);
 
     QStringList reply_subject(QStringLiteral("Re:"));
     int start = 0;
 
     // extract mailing list tags & find start of ‘base’ subject
     QRegularExpressionMatchIterator i = rePrefixMatcher.globalMatch(subject);
     while (i.hasNext() && i.peekNext().capturedStart() == start) {
         if (!i.peekNext().captured(1).isEmpty())
             reply_subject << i.peekNext().captured(1);
         start = i.next().capturedEnd();
     }
 
     // no trailing space after last mailing list tag before empty ‘base’ subject
     // TODO: this is for test-suite compliance only; remove?
     if (start < subject.length() || reply_subject.length() == 1)
         reply_subject << subject.mid(start);
 
     return reply_subject.join(QLatin1Char(' '));
 }
 
 /** @short Prepare a subject to be used in a message to be forwarded */
 QString forwardSubject(const QString &subject)
 {
     QLatin1String forwardPrefix("Fwd: ");
     return forwardPrefix + subject;
 }
 
 }
 }