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#include "selection.hh"
#include "utf8.hh"
namespace Kakoune
{
Selection::Selection(const BufferIterator& first, const BufferIterator& last)
: m_first(first), m_last(last)
{
check_invariant();
register_with_buffer();
}
Selection::Selection(const Selection& other)
: m_first(other.m_first), m_last(other.m_last)
{
register_with_buffer();
}
Selection::~Selection()
{
unregister_with_buffer();
}
Selection& Selection::operator=(const Selection& other)
{
const bool new_buffer = &m_first.buffer() != &other.m_first.buffer();
if (new_buffer)
unregister_with_buffer();
m_first = other.m_first;
m_last = other.m_last;
if (new_buffer)
register_with_buffer();
return *this;
}
BufferIterator Selection::begin() const
{
return std::min(m_first, m_last);
}
BufferIterator Selection::end() const
{
return utf8::next(std::max(m_first, m_last));
}
void Selection::merge_with(const Selection& selection)
{
if (m_first < m_last)
m_first = std::min(m_first, selection.m_first);
if (m_first > m_last)
m_first = std::max(m_first, selection.m_first);
m_last = selection.m_last;
}
static void avoid_eol(BufferIterator& it)
{
const auto column = it.column();
if (column != 0 and column == it.buffer().line_length(it.line()) - 1)
it = utf8::previous(it);
}
void Selection::avoid_eol()
{
Kakoune::avoid_eol(m_first);
Kakoune::avoid_eol(m_last);
}
void Selection::on_insert(const BufferIterator& begin, const BufferIterator& end)
{
m_first.on_insert(begin.coord(), end.coord());
m_last.on_insert(begin.coord(), end.coord());
check_invariant();
}
void Selection::on_erase(const BufferIterator& begin, const BufferIterator& end)
{
m_first.on_erase(begin.coord(), end.coord());
m_last.on_erase(begin.coord(), end.coord());
check_invariant();
}
void Selection::register_with_buffer()
{
Buffer& buffer = const_cast<Buffer&>(m_first.buffer());
buffer.add_change_listener(*this);
}
void Selection::unregister_with_buffer()
{
Buffer& buffer = const_cast<Buffer&>(m_first.buffer());
buffer.remove_change_listener(*this);
}
void Selection::check_invariant() const
{
assert(utf8::is_character_start(m_first));
assert(utf8::is_character_start(m_last));
}
}
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