97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
#include "selection.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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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 std::max(m_first, m_last) + 1;
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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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else
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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 update_iterator(const Modification& modification,
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BufferIterator& iterator)
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{
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if (iterator < modification.position)
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return;
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size_t length = modification.content.length();
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if (modification.type == Modification::Erase)
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{
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// do not move length on the other side of the inequality,
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// as modification.position + length may be after buffer end
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if (iterator - length <= modification.position)
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iterator = modification.position;
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else
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iterator -= length;
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}
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else
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{
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assert(modification.type == Modification::Insert);
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iterator += length;
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}
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}
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void Selection::on_modification(const Modification& modification)
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{
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update_iterator(modification, m_first);
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update_iterator(modification, m_last);
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}
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void Selection::register_with_buffer()
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{
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const_cast<Buffer&>(m_first.buffer()).register_modification_listener(this);
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}
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void Selection::unregister_with_buffer()
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{
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const_cast<Buffer&>(m_first.buffer()).unregister_modification_listener(this);
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}
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}
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