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