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add PieceTable::get_start_of_line()

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This commit is contained in:
Josh Holtrop 2016-07-29 21:19:01 -04:00
parent d043137099
commit b61513b97e
2 changed files with 14 additions and 0 deletions
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12
src/core/PieceTable.cc
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@ -29,3 +29,15 @@ void PieceTable::append_initial_line_piece(uint8_t * start, uint32_t length, uin
if (cursor_position.pd == end_descriptor) if (cursor_position.pd == end_descriptor)
cursor_position.pd = pd; cursor_position.pd = pd;
} }
PieceTable::PieceDescriptor * PieceTable::get_start_of_line(PieceTable::PieceDescriptor * start) const
{
PieceDescriptor * pd = start;
while (pd->prev != start_descriptor && !pd->prev->eol())
{
pd = pd->prev;
}
return pd;
}

2
src/core/PieceTable.h
View File

@ -81,6 +81,8 @@ public:
void append_initial_line_piece(uint8_t * start, uint32_t length, uint32_t n_chars, bool eol); void append_initial_line_piece(uint8_t * start, uint32_t length, uint32_t n_chars, bool eol);
PieceDescriptor * get_start_of_line(PieceDescriptor * start) const;
protected: protected:
const uint8_t * m_file_buffer; const uint8_t * m_file_buffer;
unsigned long m_file_buffer_size; unsigned long m_file_buffer_size;