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4coder/4ed_buffer.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 06.01.2017
*
* The 4coder base buffer data structure.
*
*/
// TOP
//
// Buffer low level operations
//
internal void
write_cursor_with_index(Cursor_With_Index *positions, i32 *count, i64 pos){
positions[*count].index = *count;
positions[*count].pos = pos;
++(*count);
}
internal void
buffer_quick_sort_cursors(Cursor_With_Index *positions, i32 first, i32 one_past_last){
if (first + 1 < one_past_last){
i32 pivot = one_past_last - 1;
i64 pivot_pos = positions[pivot].pos;
i32 j = first;
for (i32 i = first; i < pivot; i += 1){
i64 pos = positions[i].pos;
if (pos < pivot_pos){
Swap(Cursor_With_Index, positions[j], positions[i]);
j += 1;
}
}
Swap(Cursor_With_Index, positions[j], positions[pivot]);
buffer_quick_sort_cursors(positions, first, j);
buffer_quick_sort_cursors(positions, j + 1, one_past_last);
}
}
internal void
buffer_sort_cursors(Cursor_With_Index *positions, i32 count){
if (count > 0){
buffer_quick_sort_cursors(positions, 0, count);
}
}
internal void
buffer_unsort_cursors(Cursor_With_Index *positions, i32 count){
if (count > 0){
i32 i = 0;
for (;;){
if (positions[i].index == i){
i += 1;
if (i >= count){
break;
}
}
else{
i32 j = positions[i].index;
Swap(Cursor_With_Index, positions[i], positions[j]);
}
}
}
}
#if 0
function void
buffer_sort_batch(Edit *batch, i32 first, i32 one_past_last){
if (first + 1 < one_past_last){
i32 pivot = one_past_last - 1;
i64 pivot_pos = batch[pivot].range.first;
i32 j = first;
for (i32 i = first; i < pivot; i += 1){
i64 pos = batch[i].range.first;
if (pos < pivot_pos){
Swap(Edit, batch[j], batch[i]);
j += 1;
}
}
Swap(Edit, batch[j], batch[pivot]);
buffer_sort_batch(batch, first, j);
buffer_sort_batch(batch, j + 1, one_past_last);
}
}
function Edit_Array
buffer_batch_array_from_linked_list(Arena *arena, Batch_Edit *batch, i32 count){
Edit_Array result = {};
result.count = count;
result.vals = push_array(arena, Edit, count);
i32 counter = 0;
for (Batch_Edit *node = batch;
counter < count && node != 0;
node = node->next){
result.vals[counter] = node->edit;
counter += 1;
}
return(result);
}
function Edit_Array
buffer_sort_batch(Arena *arena, Batch_Edit *batch, i32 count){
Edit_Array result = buffer_batch_array_from_linked_list(arena, batch, count);
buffer_sort_batch(result.vals, 0, result.count);
return(result);
}
#endif
internal void
buffer_update_cursors_lean_l(Cursor_With_Index *sorted_positions, i32 count,
Batch_Edit *batch){
Cursor_With_Index *pos = sorted_positions;
Cursor_With_Index *end_pos = sorted_positions + count;
i64 shift_amount = 0;
for (; batch != 0 && pos < end_pos;
batch = batch->next){
Range_i64 range = batch->edit.range;
i64 len = batch->edit.text.size;
if (shift_amount != 0){
for (;pos < end_pos && pos->pos < range.first; pos += 1){
pos->pos += shift_amount;
}
}
else{
for (;pos < end_pos && pos->pos < range.first; pos += 1);
}
i64 new_pos = range.first + shift_amount;
for (;pos < end_pos && pos->pos <= range.one_past_last; pos += 1){
pos->pos = new_pos;
}
shift_amount += len - (range.one_past_last - range.first);
}
if (shift_amount != 0){
for (;pos < end_pos; pos += 1){
pos->pos += shift_amount;
}
}
}
internal void
buffer_update_cursors_lean_r(Cursor_With_Index *sorted_positions, i32 count,
Batch_Edit *batch){
Cursor_With_Index *pos = sorted_positions;
Cursor_With_Index *end_pos = sorted_positions + count;
i64 shift_amount = 0;
for (; batch != 0 && pos < end_pos;
batch = batch->next){
Range_i64 range = batch->edit.range;
i64 len = batch->edit.text.size;
if (shift_amount != 0){
for (;pos < end_pos && pos->pos < range.first; pos += 1){
pos->pos += shift_amount;
}
}
else{
for (;pos < end_pos && pos->pos < range.first; pos += 1);
}
i64 new_pos = range.first + len + shift_amount;
for (;pos < end_pos && pos->pos < range.one_past_last; pos += 1){
pos->pos = new_pos;
}
shift_amount += len - (range.one_past_last - range.first);
}
if (shift_amount != 0){
for (;pos < end_pos; pos += 1){
pos->pos += shift_amount;
}
}
}
//////////////////////////////////////
internal b32
buffer_good(Gap_Buffer *buffer){
return(buffer->data != 0);
}
internal i64
buffer_size(Gap_Buffer *buffer){
return(buffer->size1 + buffer->size2);
}
internal i64
buffer_line_count(Gap_Buffer *buffer){
return(buffer->line_start_count - 1);
}
internal void
buffer_init(Gap_Buffer *buffer, u8 *data, u64 size, Base_Allocator *allocator){
block_zero_struct(buffer);
buffer->allocator = allocator;
u64 capacity = round_up_u64(size*2, KB(4));
String_Const_u8 memory = base_allocate(allocator, capacity);
buffer->data = (u8*)memory.str;
buffer->size1 = size/2;
buffer->gap_size = capacity - size;
buffer->size2 = size - buffer->size1;
buffer->max = capacity;
block_copy(buffer->data, data, buffer->size1);
block_copy(buffer->data + buffer->size1 + buffer->gap_size, data + buffer->size1, buffer->size2);
}
internal b32
buffer_replace_range(Gap_Buffer *buffer, Range_i64 range, String_Const_u8 text, i64 shift_amount){
i64 size = buffer_size(buffer);
Assert(0 <= range.start);
Assert(range.start <= range.end);
Assert(range.end <= size);
if (shift_amount + size > buffer->max){
i64 new_max = round_up_i64(2*(shift_amount + size), KB(4));
i64 new_gap_size = new_max - size;
String_Const_u8 new_memory_data = base_allocate(buffer->allocator, new_max);
u8 *new_memory = (u8*)new_memory_data.str;
block_copy(new_memory, buffer->data, buffer->size1);
block_copy(new_memory + buffer->size1 + new_gap_size, buffer->data + buffer->size1 + buffer->gap_size,
buffer->size2);
base_free(buffer->allocator, buffer->data);
buffer->data = new_memory;
buffer->gap_size = new_gap_size;
buffer->max = new_max;
}
Assert(shift_amount + size <= buffer->max);
b32 result = false;
if (range.end < buffer->size1){
i64 move_size = buffer->size1 - range.end;
block_copy(buffer->data + buffer->size1 + buffer->gap_size - move_size,
buffer->data + range.end,
move_size);
buffer->size1 -= move_size;
buffer->size2 += move_size;
}
if (range.start > buffer->size1){
i64 move_size = range.start - buffer->size1;
block_copy(buffer->data + buffer->size1,
buffer->data + buffer->size1 + buffer->gap_size,
move_size);
buffer->size1 += move_size;
buffer->size2 -= move_size;
}
block_copy(buffer->data + range.start, text.str, text.size);
buffer->size2 = size - range.end;
buffer->size1 = range.start + text.size;
buffer->gap_size -= shift_amount;
Assert(buffer->size1 + buffer->size2 == size + shift_amount);
Assert(buffer->size1 + buffer->gap_size + buffer->size2 == buffer->max);
return(result);
}
////////////////////////////////
internal List_String_Const_u8
buffer_get_chunks(Arena *arena, Gap_Buffer *buffer){
List_String_Const_u8 list = {};
if (buffer->size1 > 0){
string_list_push(arena, &list, SCu8(buffer->data, buffer->size1));
}
if (buffer->size2 > 0){
u64 gap_2_pos = buffer->size1 + buffer->gap_size;
string_list_push(arena, &list, SCu8(buffer->data + gap_2_pos, buffer->size2));
}
return(list);
}
internal void
buffer_chunks_clamp(List_String_Const_u8 *chunks, Range_i64 range){
i64 p = 0;
List_String_Const_u8 list = {};
for (Node_String_Const_u8 *node = chunks->first, *next = 0;
node != 0;
node = next){
next = node->next;
Range_i64 node_range = Ii64(p, p + node->string.size);
if (range_overlap(range, node_range)){
i64 first = Max(node_range.first, range.first) - node_range.first;
i64 one_past_last = Min(node_range.one_past_last, range.one_past_last) - node_range.first;
String_Const_u8 s = string_prefix(node->string, one_past_last);
node->string = string_skip(s, first);
sll_queue_push(list.first, list.last, node);
list.total_size += node->string.size;
list.node_count += 1;
}
p = node_range.one_past_last;
}
*chunks = list;
}
internal String_Const_u8
buffer_stringify(Arena *arena, Gap_Buffer *buffer, Range_i64 range){
List_String_Const_u8 list = buffer_get_chunks(arena, buffer);
buffer_chunks_clamp(&list, range);
return(string_list_flatten(arena, list, StringFill_NullTerminate));
}
internal String_Const_u8
buffer_eol_convert_out(Arena *arena, Gap_Buffer *buffer, Range_i64 range){
List_String_Const_u8 list = buffer_get_chunks(arena, buffer);
buffer_chunks_clamp(&list, range);
u64 cap = list.total_size*2;
u8 *memory = push_array(arena, u8, cap);
u8 *memory_opl = memory + cap;
u8 *ptr = memory;
for (Node_String_Const_u8 *node = list.first;
node != 0;
node = node->next){
u8 *byte = node->string.str;
u8 *byte_opl = byte + node->string.size;
for (;byte < byte_opl; byte += 1){
if (*byte == '\n'){
*ptr = '\r';
ptr += 1;
*ptr = '\n';
ptr += 1;
}
else{
*ptr = *byte;
ptr += 1;
}
}
}
linalloc_pop(arena, (memory_opl - ptr));
push_align(arena, 8);
return(SCu8(memory, ptr));
}
#if 0
internal i64
buffer_count_newlines(Arena *scratch, Gap_Buffer *buffer, i64 start, i64 end){
Temp_Memory temp = begin_temp(scratch);
List_String_Const_u8 list = buffer_get_chunks(scratch, buffer);
buffer_chunks_clamp(&list, Ii64(start, end));
i64 count = 0;
for (Node_String_Const_u8 *node = list.first;
node != 0;
node = node->next){
u8 *byte = node->string.str;
u8 *byte_opl = byte + node->string.size;
for (;byte < byte_opl; byte += 1){
if (*byte == '\n'){
count += 1;
}
}
}
end_temp(temp);
return(count);
}
#endif
internal void
buffer_starts__ensure_max_size(Gap_Buffer *buffer, i64 max_size){
if (max_size > buffer->line_start_max){
i64 new_max = round_up_i64(max_size*2, KB(1));
String_Const_u8 memory = base_allocate(buffer->allocator, sizeof(*buffer->line_starts)*new_max);
i64 *new_line_starts = (i64*)memory.str;
block_copy_dynamic_array(new_line_starts, buffer->line_starts, buffer->line_start_count);
buffer->line_start_max = new_max;
base_free(buffer->allocator, buffer->line_starts);
buffer->line_starts = new_line_starts;
}
}
internal void
buffer_measure_starts__write(Gap_Buffer *buffer, i64 pos){
buffer_starts__ensure_max_size(buffer, buffer->line_start_count + 1);
buffer->line_starts[buffer->line_start_count] = pos;
buffer->line_start_count += 1;
}
internal void
buffer_measure_starts(Arena *scratch, Gap_Buffer *buffer){
Temp_Memory temp = begin_temp(scratch);
List_String_Const_u8 list = buffer_get_chunks(scratch, buffer);
buffer->line_start_count = 0;
buffer_measure_starts__write(buffer, 0);
i64 index = 0;
for (Node_String_Const_u8 *node = list.first;
node != 0;
node = node->next){
u8 *byte = node->string.str;
u8 *byte_opl = byte + node->string.size;
for (;byte < byte_opl; byte += 1){
index += 1;
if (*byte == '\n'){
buffer_measure_starts__write(buffer, index);
}
}
}
buffer_measure_starts__write(buffer, buffer_size(buffer));
end_temp(temp);
}
internal i64
buffer_get_line_index(Gap_Buffer *buffer, i64 pos){
i64 i = 0;
if (buffer->line_start_count > 2){
i64 start = 0;
i64 one_past_last = buffer->line_start_count - 1;
i64 *array = buffer->line_starts;
pos = clamp_bot(0, pos);
for (;;){
i = (start + one_past_last) >> 1;
if (array[i] < pos){
start = i;
}
else if (array[i] > pos){
one_past_last = i;
}
else{
break;
}
if (start + 1 >= one_past_last){
i = start;
break;
}
}
}
return(i);
}
Line_Move*
push_line_move(Arena *arena, Line_Move *moves, i64 new_line_first,
i64 old_line_first, i64 old_line_opl, i64 text_shift){
Line_Move *move = push_array(arena, Line_Move, 1);
move->next = moves;
move->kind = LineMove_ShiftOldValues;
move->new_line_first = new_line_first;
move->old_line_first = old_line_first;
move->old_line_opl = old_line_opl;
move->text_shift = text_shift;
return(move);
}
Line_Move*
push_line_move(Arena *arena, Line_Move *moves, i64 new_line_first,
String_Const_u8 string, i64 text_base){
Line_Move *move = push_array(arena, Line_Move, 1);
move->next = moves;
move->kind = LineMove_MeasureString;
move->new_line_first = new_line_first;
move->string = string;
move->text_base = text_base;
return(move);
}
function i64
count_lines(String_Const_u8 string){
i64 result = 0;
for (u64 i = 0; i < string.size; i += 1){
if (string.str[i] == '\n'){
result += 1;
}
}
return(result);
}
function void
fill_line_starts(i64 *lines_starts, String_Const_u8 string, i64 text_base){
i64 *ptr = lines_starts;
for (u64 i = 0; i < string.size; i += 1){
if (string.str[i] == '\n'){
*ptr = text_base + i + 1;
ptr += 1;
}
}
}
function void
buffer_remeasure_starts(Thread_Context *tctx, Gap_Buffer *buffer, Batch_Edit *batch){
Scratch_Block scratch(tctx);
i64 line_start_count = buffer_line_count(buffer) + 1;
Line_Move *moves = 0;
i64 current_line = 0;
i64 text_shift = 0;
i64 line_shift = 0;
for (Batch_Edit *node = batch;
node != 0;
node = node->next){
i64 first_line = buffer_get_line_index(buffer, node->edit.range.first);
i64 opl_line = buffer_get_line_index(buffer, node->edit.range.one_past_last);
i64 new_line_count = count_lines(node->edit.text);
i64 deleted_line_count = opl_line - first_line;
Assert(first_line <= opl_line);
Assert(opl_line <= line_start_count);
if (current_line <= first_line &&
(text_shift != 0 || line_shift != 0)){
moves = push_line_move(scratch, moves, current_line + line_shift,
current_line, first_line + 1, text_shift);
}
if (new_line_count != 0){
moves = push_line_move(scratch, moves, first_line + 1 + line_shift,
node->edit.text, node->edit.range.first + text_shift);
}
text_shift += node->edit.text.size - range_size(node->edit.range);
line_shift += new_line_count - deleted_line_count;
current_line = opl_line + 1;
}
moves = push_line_move(scratch, moves, current_line + line_shift,
current_line, line_start_count, text_shift);
line_start_count = line_start_count + line_shift;
buffer_starts__ensure_max_size(buffer, line_start_count + 1);
buffer->line_start_count = line_start_count;
i64 *array = buffer->line_starts;
for (Line_Move *node = moves;
node != 0;
node = node->next){
if (node->kind == LineMove_ShiftOldValues){
i64 line_index_shift = node->new_line_first - node->old_line_first;
i64 move_text_shift = node->text_shift;
if (line_index_shift > 0){
for (i64 i = node->old_line_opl - 1;
i >= node->old_line_first;
i -= 1){
array[i + line_index_shift] = array[i] + move_text_shift;
}
}
else{
for (i64 i = node->old_line_first;
i < node->old_line_opl;
i += 1){
array[i + line_index_shift] = array[i] + move_text_shift;
}
}
}
}
for (Line_Move *node = moves;
node != 0;
node = node->next){
if (node->kind == LineMove_MeasureString){
fill_line_starts(array + node->new_line_first, node->string, node->text_base);
}
}
}
internal Range_i64
buffer_get_pos_range_from_line_number(Gap_Buffer *buffer, i64 line_number){
Range_i64 result = {};
if (1 <= line_number && line_number < buffer->line_start_count){
result.first = buffer->line_starts[line_number - 1];
result.one_past_last = buffer->line_starts[line_number];
}
return(result);
}
internal i64
buffer_get_first_pos_from_line_number(Gap_Buffer *buffer, i64 line_number){
i64 result = 0;
if (line_number < 1){
result = 0;
}
else if (line_number >= buffer->line_start_count){
result = buffer_size(buffer);
}
else{
result = buffer->line_starts[line_number - 1];
}
return(result);
}
internal i64
buffer_get_last_pos_from_line_number(Gap_Buffer *buffer, i64 line_number){
i64 result = 0;
if (line_number < 1){
result = 0;
}
else if (line_number >= buffer->line_start_count - 1){
result = buffer_size(buffer);
}
else{
result = buffer->line_starts[line_number] - 1;
}
return(result);
}
internal Buffer_Cursor
buffer_cursor_from_pos(Gap_Buffer *buffer, i64 pos){
i64 size = buffer_size(buffer);
pos = clamp(0, pos, size);
i64 line_index = buffer_get_line_index(buffer, pos);
Buffer_Cursor result = {};
result.pos = pos;
result.line = line_index + 1;
result.col = pos - buffer->line_starts[line_index] + 1;
return(result);
}
internal Buffer_Cursor
buffer_cursor_from_line_col(Gap_Buffer *buffer, i64 line, i64 col){
i64 size = buffer_size(buffer);
i64 line_index = line - 1;
i64 line_count = buffer_line_count(buffer);
line_index = clamp(0, line_index, line_count - 1);
i64 this_start = buffer->line_starts[line_index];
i64 max_col = (buffer->line_starts[line_index + 1] - this_start);
if (line_index + 1 == line_count){
max_col += 1;
}
max_col = clamp_bot(1, max_col);
if (col < 0){
if (-col > max_col){
col = 1;
}
else{
col = max_col + col + 1;
}
}
else if (col == 0){
col = 1;
}
else{
col = clamp_top(col, max_col);
}
Assert(col > 0);
i64 adjusted_pos = col - 1;
i64 pos = this_start + adjusted_pos;
Buffer_Cursor result = {};
result.pos = pos;
result.line = line_index + 1;
result.col = col;
return(result);
}
internal String_Const_u8
buffer_invert_edit_shift(Arena *arena, Gap_Buffer *buffer, Edit edit, Edit *inv, i64 shift_amount){
String_Const_u8 string = buffer_stringify(arena, buffer, edit.range);
inv->text = string;
inv->range = Ii64(edit.range.start + shift_amount, edit.range.start + edit.text.size + shift_amount);
return(string);
}
internal b32
buffer_invert_batch(Arena *arena, Gap_Buffer *buffer, Edit *edits, Edit *inverse, i64 count){
b32 result = false;
i64 pos = 0;
i64 shift_amount = 0;
Edit *edit = edits;
Edit *inv_edit = inverse;
for (i64 i = 0; i < count; i += 1, edit += 1, inv_edit += 1){
String_Const_u8 inv_str = buffer_invert_edit_shift(arena, buffer, *edit, inv_edit, shift_amount);
shift_amount += replace_range_shift(edit->range, edit->text.size);
pos += inv_str.size;
}
return(result);
}
internal Buffer_Chunk_Position
buffer_get_chunk_position(String_Const_u8_Array chunks, i64 buffer_size, i64 real_pos){
Buffer_Chunk_Position pos = {};
pos.real_pos = real_pos;
pos.chunk_pos = real_pos;
if (pos.real_pos != buffer_size){
for (;(i64)(chunks.vals[pos.chunk_index].size) <= pos.chunk_pos;){
Assert(pos.chunk_index < chunks.count);
pos.chunk_pos -= (i32)chunks.vals[pos.chunk_index].size;
pos.chunk_index += 1;
}
}
else{
pos.chunk_index = chunks.count - 1;
pos.chunk_pos = (i32)chunks.vals[pos.chunk_index].size;
}
return(pos);
}
internal i32
buffer_chunk_position_iterate(String_Const_u8_Array chunks, Buffer_Chunk_Position *pos, Scan_Direction direction){
i32 past_end = 0;
pos->real_pos += direction;
pos->chunk_pos += direction;
if (pos->chunk_pos < 0){
if (pos->chunk_index == 0){
past_end = -1;
}
else{
pos->chunk_index -= 1;
pos->chunk_pos = (i32)chunks.vals[pos->chunk_index].size - 1;
}
}
else if (pos->chunk_pos >= (i64)(chunks.vals[pos->chunk_index].size)){
pos->chunk_index += 1;
if (pos->chunk_index == chunks.count){
past_end = 1;
}
else{
pos->chunk_pos = 0;
}
}
return(past_end);
}
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