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Create empty inserting piece when entering insert mode

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This commit is contained in:
Josh Holtrop 2016-10-29 09:07:48 -04:00
parent 827f4efdd9
commit fe64622762
2 changed files with 32 additions and 33 deletions
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62
src/core/PieceTable.cc
View File

@ -426,15 +426,21 @@ void PieceTable::begin_insert(const Cursor & cursor, bool before)
{
offset += cursor.iterator.num_bytes_in_code_point();
}
Change * change = add_change();
m_inserting_piece = add_piece();
m_inserting_piece->start = &m_append_buffer[m_append_buffer_index];
m_inserting_piece->length = 0u;
if (offset == 0u)
{
/* Insert happens at piece boundary between piece->prev and piece. */
m_insert_before_piece = piece->prev;
change->before = piece->prev;
change->after = piece;
}
else if (offset >= piece->length)
{
/* Insert happens at piece boundary between piece and piece->next. */
m_insert_before_piece = piece;
change->before = piece;
change->after = piece->next;
}
else
{
@ -453,50 +459,42 @@ void PieceTable::begin_insert(const Cursor & cursor, bool before)
new_piece_2->prev = new_piece_1;
new_piece_2->next = piece->next;
Change * change = add_change();
change->before = piece->prev;
change->after = piece->next;
change->chains[0][0] = piece;
change->chains[0][1] = nullptr;
change->chains[1][0] = new_piece_1;
change->chains[1][1] = new_piece_2;
Change * change2 = add_change();
change2->before = piece->prev;
change2->after = piece->next;
change2->chains[0][0] = piece;
change2->chains[0][1] = nullptr;
change2->chains[1][0] = new_piece_1;
change2->chains[1][1] = new_piece_2;
apply_change(change, 1u);
apply_change(change2, 1u);
m_insert_before_piece = new_piece_1;
change->before = new_piece_1;
change->after = new_piece_2;
}
m_inserting_piece = nullptr;
change->chains[0][0] = nullptr;
change->chains[0][1] = nullptr;
change->chains[1][0] = m_inserting_piece;
change->chains[1][1] = nullptr;
apply_change(change, 1u);
}
void PieceTable::insert_code_point(uint32_t code_point)
{
if (m_inserting_piece == nullptr)
if (in_insert_mode())
{
m_inserting_piece = add_piece();
m_inserting_piece->start = &m_append_buffer[m_append_buffer_index];
m_inserting_piece->length = 0u;
m_inserting_piece->prev = m_insert_before_piece;
m_inserting_piece->next = m_insert_before_piece->next;
Change * change = add_change();
change->before = m_insert_before_piece;
change->after = m_insert_before_piece->next;
change->chains[0][0] = nullptr;
change->chains[0][1] = nullptr;
change->chains[1][0] = m_inserting_piece;
change->chains[1][1] = nullptr;
apply_change(change, 1u);
/* TODO: worry about append buffer page boundaries */
uint8_t bytes = Encoding::encode(code_point, encoding, &m_append_buffer[m_append_buffer_index]);
m_inserting_piece->length += bytes;
m_append_buffer_index += bytes;
}
uint8_t bytes = Encoding::encode(code_point, encoding, &m_append_buffer[m_append_buffer_index]);
m_inserting_piece->length += bytes;
m_append_buffer_index += bytes;
}
void PieceTable::end_insert()
{
m_inserting_piece = nullptr;
}
void PieceTable::insertion_test(Cursor & c)

3
src/core/PieceTable.h
View File

@ -172,6 +172,8 @@ public:
void undo();
bool in_insert_mode() { return m_inserting_piece != nullptr; }
protected:
Piece * add_piece()
{
@ -199,7 +201,6 @@ protected:
uint32_t m_piece_index;
PagedBuffer<Change> m_changes;
uint32_t m_changes_index;
Piece * m_insert_before_piece;
Piece * m_inserting_piece;
std::list<std::shared_ptr<Cursor>> m_cursors;