ircnicknamecompleter.cpp

//------------------------------------------------------------------------------
// ircnicknamecompleter.cpp
//------------------------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301  USA
//
//------------------------------------------------------------------------------
// Copyright (C) 2014 "Zalewa" <zalewapl@gmail.com>
//------------------------------------------------------------------------------
#include "ircnicknamecompleter.h"

#include "gui/irc/ircuserlistmodel.h"

#include <QCompleter>
#include <QRegularExpression>

class IRCNicknameCompleterState
{
public:
        int cursorPos;
        QString textLine;

        IRCNicknameCompleterState()
        {
                cursorPos = -1;
        }

        QString extractNicknamePrefix() const
        {
                const QString NICKNAME_MATCH = R"(\[\]\{\}\-\^\`\|\\A-Za-z0-9_)";
                QRegularExpression regex(QString("(?:.*)[^%1]?([%1]*)").arg(NICKNAME_MATCH), QRegularExpression::CaseInsensitiveOption);
                return regex.match(leftText()).captured(1);
        }

        bool isValid() const
        {
                return cursorPos >= 0;
        }

        QString leftText() const
        {
                return textLine.left(cursorPos);
        }

        QString leftTextMinusNicknamePrefix() const
        {
                return textLine.left(cursorPos - extractNicknamePrefix().length());
        }

        QString rightText() const
        {
                return textLine.mid(cursorPos);
        }
};

DClass<IRCNicknameCompleter>
{
public:
        QCompleter completer;
        IRCNicknameCompleterState state;

        IRCCompletionResult complete()
        {
                IRCCompletionResult result;
                if (!completer.currentCompletion().isEmpty())
                {
                        result.textLine = leftTextWithCompletedNickname() + state.rightText();
                        result.cursorPos = leftTextWithCompletedNickname().length();
                }
                return result;
        }

        QString leftTextWithCompletedNickname() const
        {
                return state.leftTextMinusNicknamePrefix() + completer.currentCompletion();
        }
};

DPointeredNoCopy(IRCNicknameCompleter)

IRCNicknameCompleter::IRCNicknameCompleter()
{
        d->completer.setCaseSensitivity(Qt::CaseInsensitive);
        d->completer.setCompletionRole(IRCUserListModel::RoleCleanNickname);
}

IRCNicknameCompleter::~IRCNicknameCompleter()
{
}

IRCCompletionResult IRCNicknameCompleter::complete(const QString &textLine,
        int cursorPosition)
{
        d->state = IRCNicknameCompleterState();
        d->state.cursorPos = cursorPosition;
        d->state.textLine = textLine;

        QString nickPrefix = d->state.extractNicknamePrefix();
        d->completer.setCompletionPrefix(nickPrefix);
        return d->complete();
}

IRCCompletionResult IRCNicknameCompleter::cycleNext()
{
        if (d->completer.completionCount() == 0)
                return IRCCompletionResult();
        if (d->completer.currentRow() + 1 >= d->completer.completionCount())
                d->completer.setCurrentRow(0);
        else
                d->completer.setCurrentRow(d->completer.currentRow() + 1);
        return d->complete();
}

bool IRCNicknameCompleter::isReset() const
{
        return !d->state.isValid();
}

void IRCNicknameCompleter::reset()
{
        d->state = IRCNicknameCompleterState();
}

void IRCNicknameCompleter::setModel(QAbstractItemModel *model)
{
        d->completer.setModel(model);
}