kakoune/src/buffer.inl.hh
Maxime Coste 208b28cbe7 Simplify a bit buffer iteration functions
Dont try to ensure the returned value is valid, incrementing past
the end/decrementing before begin is the caller's error.
2017-06-12 06:10:18 +01:00

221 lines
5.5 KiB
C++

#ifndef buffer_inl_h_INCLUDED
#define buffer_inl_h_INCLUDED
#include "assert.hh"
namespace Kakoune
{
[[gnu::always_inline]]
inline const char& Buffer::byte_at(BufferCoord c) const
{
kak_assert(c.line < line_count() and c.column < m_lines[c.line].length());
return m_lines[c.line][c.column];
}
inline BufferCoord Buffer::next(BufferCoord coord) const
{
if (coord.column < m_lines[coord.line].length() - 1)
return {coord.line, coord.column + 1};
return { coord.line + 1, 0 };
}
inline BufferCoord Buffer::prev(BufferCoord coord) const
{
if (coord.column == 0)
return { coord.line - 1, m_lines[coord.line - 1].length() - 1 };
return { coord.line, coord.column - 1 };
}
inline ByteCount Buffer::distance(BufferCoord begin, BufferCoord end) const
{
if (begin > end)
return -distance(end, begin);
if (begin.line == end.line)
return end.column - begin.column;
ByteCount res = m_lines[begin.line].length() - begin.column;
for (LineCount l = begin.line+1; l < end.line; ++l)
res += m_lines[l].length();
res += end.column;
return res;
}
inline bool Buffer::is_valid(BufferCoord c) const
{
return (c.line >= 0 and c.column >= 0) and
((c.line < line_count() and c.column < m_lines[c.line].length()) or
(c.line == line_count() and c.column == 0));
}
inline bool Buffer::is_end(BufferCoord c) const
{
return c >= end_coord();
}
inline BufferIterator Buffer::begin() const
{
return {*this, { 0, 0 }};
}
inline BufferIterator Buffer::end() const
{
return {*this, end_coord()};
}
[[gnu::always_inline]]
inline LineCount Buffer::line_count() const
{
return LineCount{(int)m_lines.size()};
}
inline size_t Buffer::timestamp() const
{
return m_changes.size();
}
inline StringView Buffer::substr(BufferCoord begin, BufferCoord end) const
{
kak_assert(begin.line == end.line);
return m_lines[begin.line].substr(begin.column, end.column - begin.column);
}
inline ConstArrayView<Buffer::Change> Buffer::changes_since(size_t timestamp) const
{
if (timestamp < m_changes.size())
return { m_changes.data() + timestamp,
m_changes.data() + m_changes.size() };
return {};
}
inline BufferCoord Buffer::back_coord() const
{
return { line_count() - 1, m_lines.back().length() - 1 };
}
inline BufferCoord Buffer::end_coord() const
{
return line_count();
}
inline BufferIterator::BufferIterator(const Buffer& buffer, BufferCoord coord) noexcept
: m_buffer{&buffer}, m_coord{coord},
m_line_count{buffer.line_count()},
m_line{coord.line < buffer.line_count() ? (*m_buffer)[coord.line] : StringView{}} {}
inline bool BufferIterator::operator==(const BufferIterator& iterator) const noexcept
{
return m_buffer == iterator.m_buffer and m_coord == iterator.m_coord;
}
inline bool BufferIterator::operator!=(const BufferIterator& iterator) const noexcept
{
return m_buffer != iterator.m_buffer or m_coord != iterator.m_coord;
}
inline bool BufferIterator::operator<(const BufferIterator& iterator) const noexcept
{
kak_assert(m_buffer == iterator.m_buffer);
return (m_coord < iterator.m_coord);
}
inline bool BufferIterator::operator<=(const BufferIterator& iterator) const noexcept
{
kak_assert(m_buffer == iterator.m_buffer);
return (m_coord <= iterator.m_coord);
}
inline bool BufferIterator::operator>(const BufferIterator& iterator) const noexcept
{
kak_assert(m_buffer == iterator.m_buffer);
return (m_coord > iterator.m_coord);
}
inline bool BufferIterator::operator>=(const BufferIterator& iterator) const noexcept
{
kak_assert(m_buffer == iterator.m_buffer);
return (m_coord >= iterator.m_coord);
}
[[gnu::always_inline]]
inline const char& BufferIterator::operator*() const noexcept
{
return m_line[m_coord.column];
}
inline const char& BufferIterator::operator[](size_t n) const noexcept
{
return m_buffer->byte_at(m_buffer->advance(m_coord, n));
}
inline size_t BufferIterator::operator-(const BufferIterator& iterator) const
{
kak_assert(m_buffer == iterator.m_buffer);
return (size_t)m_buffer->distance(iterator.m_coord, m_coord);
}
inline BufferIterator BufferIterator::operator+(ByteCount size) const
{
kak_assert(m_buffer);
return { *m_buffer, m_buffer->advance(m_coord, size) };
}
inline BufferIterator BufferIterator::operator-(ByteCount size) const
{
return { *m_buffer, m_buffer->advance(m_coord, -size) };
}
inline BufferIterator& BufferIterator::operator+=(ByteCount size)
{
m_coord = m_buffer->advance(m_coord, size);
m_line = (*m_buffer)[m_coord.line];
return *this;
}
inline BufferIterator& BufferIterator::operator-=(ByteCount size)
{
m_coord = m_buffer->advance(m_coord, -size);
m_line = (*m_buffer)[m_coord.line];
return *this;
}
inline BufferIterator& BufferIterator::operator++()
{
if (++m_coord.column == m_line.length())
{
m_line = (++m_coord.line < m_line_count) ?
(*m_buffer)[m_coord.line] : StringView{};
m_coord.column = 0;
}
return *this;
}
inline BufferIterator& BufferIterator::operator--()
{
if (m_coord.column == 0)
{
m_line = (*m_buffer)[--m_coord.line];
m_coord.column = m_line.length() - 1;
}
else
--m_coord.column;
return *this;
}
inline BufferIterator BufferIterator::operator++(int)
{
BufferIterator save = *this;
++*this;
return save;
}
inline BufferIterator BufferIterator::operator--(int)
{
BufferIterator save = *this;
--*this;
return save;
}
}
#endif // buffer_inl_h_INCLUDED