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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "celliterator.h"
#include "terminalsurface.h"
#include <stdexcept>
namespace Terminal::Internal {
CellIterator::CellIterator(const TerminalSurface *surface, QPoint pos)
: CellIterator(surface, pos.x() + (pos.y() * surface->liveSize().width()))
{}
CellIterator::CellIterator(const TerminalSurface *surface, int pos)
: m_state(State::INSIDE)
, m_surface(surface)
{
m_maxpos = surface->fullSize().width() * (surface->fullSize().height()) - 1;
m_pos = qMax(0, qMin(m_maxpos + 1, pos));
if (m_pos == 0) {
m_state = State::BEGIN;
} else if (m_pos == m_maxpos + 1) {
m_state = State::END;
}
if (m_state != State::END)
updateChar();
}
CellIterator::CellIterator(const TerminalSurface *surface)
: m_state(State::END)
, m_surface(surface)
{
m_maxpos = surface->fullSize().width() * (surface->fullSize().height()) - 1;
m_pos = m_maxpos + 1;
}
QPoint CellIterator::gridPos() const
{
return m_surface->posToGrid(m_pos);
}
bool CellIterator::updateChar()
{
QPoint cell = m_surface->posToGrid(m_pos);
m_char = m_surface->fetchCharAt(cell.x(), cell.y());
return m_char != 0;
}
CellIterator &CellIterator::operator-=(int n)
{
if (n == 0)
return *this;
if (m_pos - n < 0)
throw new std::runtime_error("-= n too big!");
m_pos -= n;
while (!updateChar() && m_pos > 0 && m_skipZeros)
m_pos--;
m_state = State::INSIDE;
if (m_pos == 0) {
m_state = State::BEGIN;
}
return *this;
}
CellIterator &CellIterator::operator+=(int n)
{
if (n == 0)
return *this;
if (m_pos + n < m_maxpos + 1) {
m_state = State::INSIDE;
m_pos += n;
while (!updateChar() && m_pos < (m_maxpos + 1) && m_skipZeros)
m_pos++;
if (m_pos == m_maxpos + 1)
m_state = State::END;
} else {
*this = m_surface->end();
}
return *this;
}
} // namespace Terminal::Internal
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