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