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add a cursor position attribute to PieceTable

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This commit is contained in:
Josh Holtrop 2016-07-28 21:48:18 -04:00
parent 26f8fb355e
commit 89c0ca0bfa
2 changed files with 15 additions and 0 deletions
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4
src/core/PieceTable.cc
View File

@ -9,6 +9,8 @@ PieceTable::PieceTable(const uint8_t * file_buffer, unsigned long file_buffer_si
start_descriptor->next = end_descriptor;
end_descriptor->prev = start_descriptor;
m_piece_descriptor_index = 2u;
m_cursor_position.pd = end_descriptor;
m_cursor_position.offset = 0u;
}
void PieceTable::append_initial_line_piece(uint8_t * start, uint32_t length, uint32_t n_chars, bool eol)
@ -24,4 +26,6 @@ void PieceTable::append_initial_line_piece(uint8_t * start, uint32_t length, uin
end_descriptor->prev->next = pd;
end_descriptor->prev = pd;
m_num_lines++;
if (m_cursor_position.pd == end_descriptor)
m_cursor_position.pd = pd;
}

11
src/core/PieceTable.h
View File

@ -43,6 +43,15 @@ public:
void toggle_eol() { n_chars ^= PIECE_DESCRIPTOR_N_CHARS_EOL_FLAG_MASK; }
};
struct Position
{
/** The piece. */
PieceDescriptor * pd;
/** Byte offset within the piece. */
uint32_t offset;
};
struct ChangeDescriptor
{
uint32_t piece_descriptor_index;
@ -68,6 +77,8 @@ public:
PieceDescriptor * start_descriptor;
PieceDescriptor * end_descriptor;
Position m_cursor_position;
void append_initial_line_piece(uint8_t * start, uint32_t length, uint32_t n_chars, bool eol);
protected: