4coder/4ed_history.cpp

387 lines
12 KiB
C++
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/*
* Mr. 4th Dimention - Allen Webster
*
* 24.03.2018
*
* History
*/
// TOP
// TODO(allen): do(make an index <-> node acceleration structure for history)
internal i32
history__to_index(Node *sentinel, Node *node){
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i32 result = -1;
i32 counter = 0;
Node *it = sentinel;
do{
if (it == node){
result = counter;
break;
}
counter += 1;
it = it->next;
} while (it != sentinel);
return(result);
}
internal Node*
history__to_node(Node *sentinel, int32_t index){
Node *result = 0;
i32 counter = 0;
Node *it = sentinel;
do{
if (counter == index){
result = it;
break;
}
counter += 1;
it = it->next;
} while (it != sentinel);
return(result);
}
internal i32
history__to_index(History *history, Node *node){
Node *sentinel = &history->records;
return(history__to_index(sentinel, node));
}
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internal Node*
history__to_node(History *history, int32_t index){
Node *result = 0;
if (0 <= index && index <= history->record_count){
Node *sentinel = &history->records;
result = history__to_node(sentinel, index);
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}
return(result);
}
internal Record*
history__allocate_record(Heap *heap, History *history){
Node *sentinel = &history->free_records;
Node *new_node = sentinel->next;
if (new_node == sentinel){
i32 new_record_count = 1024;
void *memory = memory_bank_allocate(heap, &history->bank, sizeof(Record)*new_record_count);
Record *new_record = (Record*)memory;
sentinel->next = &new_record->node;
new_record->node.prev = sentinel;
for (i32 i = 1; i < new_record_count; i += 1, new_record += 1){
new_record[0].node.next = &new_record[1].node;
new_record[1].node.prev = &new_record[0].node;
}
new_record[0].node.next = sentinel;
sentinel->prev = &new_record[0].node;
new_node = &((Record*)memory)->node;
}
dll_remove(new_node);
Record *record = CastFromMember(Record, node, new_node);
block_zero_struct(record);
return(record);
}
internal void
global_history_init(Global_History *global_history){
global_history->edit_number_counter = 0;
global_history->edit_grouping_counter = 0;
}
internal i32
global_history_get_edit_number(Global_History *global_history){
i32 result = global_history->edit_number_counter;
if (global_history->edit_grouping_counter == 0){
global_history->edit_number_counter += 1;
}
return(result);
}
internal void
global_history_adjust_edit_grouping_counter(Global_History *global_history, i32 adjustment){
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global_history->edit_grouping_counter = clamp_bottom(0, global_history->edit_grouping_counter + adjustment);
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}
internal void
history_init(Application_Links *app, History *history){
history->activated = true;
history->arena = make_arena(app, KB(32));
memory_bank_init(&history->bank);
dll_init_sentinel(&history->free_records);
dll_init_sentinel(&history->records);
history->record_count = 0;
}
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internal b32
history_is_activated(History *history){
return(history->activated);
}
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internal void
history_free(Heap *heap, History *history){
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if (!history->activated){
return;
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}
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arena_release_all(&history->arena);
memory_bank_free_all(heap, &history->bank);
block_zero_struct(history);
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}
internal i32
history_get_record_count(History *history){
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if (!history->activated){
return(0);
}
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return(history->record_count);
}
internal Record*
history_get_record(History *history, i32 index){
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if (!history->activated){
return(0);
}
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Record *record = 0;
Node *node = history__to_node(history, index);
if (node != 0){
record = CastFromMember(Record, node, node);
}
return(record);
}
internal Record*
history_get_sub_record(Record *record, i32 sub_index){
Record *result = 0;
if (record->kind == RecordKind_Group){
if (0 <= sub_index && sub_index <= record->group.count){
Node *node = history__to_node(&record->group.children, sub_index);
if (node != 0){
result = CastFromMember(Record, node, node);
}
}
}
return(result);
}
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internal Record*
history_get_dummy_record(History *history){
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if (!history->activated){
return(0);
}
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return(CastFromMember(Record, node, &history->records));
}
internal void
history__stash_record(History *history, Record *new_record){
dll_insert_back(&history->records, &new_record->node);
history->record_count += 1;
}
internal void
history__free_nodes(History *history, i32 first_index, Node *first_node, Node *last_node){
if (first_node == last_node){
dll_remove(first_node);
dll_insert(&history->free_records, first_node);
}
else{
{
Node *left = first_node->prev;
Node *right = last_node->next;
left->next = right;
right->prev = left;
}
{
Node *left = &history->free_records;
Node *right = left->next;
left->next = first_node;
first_node->prev = left;
right->prev = last_node;
last_node->next = right;
}
}
Assert(first_index != 0);
history->record_count = first_index - 1;
}
internal void
history_record_edit(Heap *heap, Global_History *global_history, History *history, Gap_Buffer *buffer, Edit edit){
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if (!history->activated){
return;
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}
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Record *new_record = history__allocate_record(heap, history);
history__stash_record(history, new_record);
new_record->restore_point = temp_memory_light(begin_temp_memory(&history->arena));
new_record->edit_number = global_history_get_edit_number(global_history);
new_record->kind = RecordKind_Single;
i32 length_forward = edit.length;
i32 length_backward = edit.range.one_past_last - edit.range.first;
new_record->single.str_forward = push_array(&history->arena, char, length_forward);
new_record->single.str_backward = push_array(&history->arena, char, length_backward);
new_record->single.length_forward = length_forward;
new_record->single.length_backward = length_backward;
new_record->single.first = edit.range.first;
block_copy(new_record->single.str_forward, edit.str, length_forward);
buffer_stringify_range(buffer, edit.range, new_record->single.str_backward);
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}
internal void
history_record_edit(Heap *heap, Global_History *global_history, History *history, Gap_Buffer *buffer, Edit_Array edits, Buffer_Batch_Edit_Type batch_type){
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if (!history->activated){
return;
}
Record *new_record = history__allocate_record(heap, history);
history__stash_record(history, new_record);
new_record->restore_point = temp_memory_light(begin_temp_memory(&history->arena));
new_record->edit_number = global_history_get_edit_number(global_history);
new_record->kind = RecordKind_Batch;
i32 length_forward = 0;
i32 length_backward = 0;
for (i32 i = 0; i < edits.count; i += 1){
length_forward += edits.vals[i].length;
length_backward += edits.vals[i].range.one_past_last - edits.vals[i].range.first;
}
new_record->batch.type = batch_type;
new_record->batch.count = edits.count;
new_record->batch.str_base_forward = push_array(&history->arena, char, length_forward);
new_record->batch.str_base_backward = push_array(&history->arena, char, length_backward);
new_record->batch.batch_records = push_array(&history->arena, Record_Batch_Slot, edits.count);
char *str_base_forward = new_record->batch.str_base_forward;
char *cursor_forward = str_base_forward;
char *str_base_backward = new_record->batch.str_base_backward;
char *cursor_backward = str_base_backward;
Record_Batch_Slot *batch_slot = new_record->batch.batch_records;
Edit *edit = edits.vals;
for (i32 i = 0; i < edits.count; i += 1, batch_slot += 1, edit += 1){
i32 first = edit->range.first;
i32 length_forward = edit->length;
i32 length_backward = edit->range.one_past_last - first;
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batch_slot->length_forward = length_forward ;
batch_slot->length_backward = length_backward;
batch_slot->first = first;
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block_copy(cursor_forward , edit->str, length_forward);
buffer_stringify_range(buffer, edit->range, cursor_backward);
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cursor_forward += length_forward ;
cursor_backward += length_backward;
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}
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}
internal void
history_dump_records_after_index(History *history, i32 index){
Assert(0 <= index && index <= history->record_count);
if (index < history->record_count){
Node *node = history__to_node(history, index);
Node *first_node_to_clear = node->next;
Node *sentinel = &history->records;
Assert(first_node_to_clear != sentinel);
Record *first_record_to_clear = CastFromMember(Record, node, first_node_to_clear);
end_temp_memory(&history->arena, first_record_to_clear->restore_point);
Node *last_node_to_clear = sentinel->prev;
history__free_nodes(history, index + 1, first_node_to_clear, last_node_to_clear);
}
}
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internal void
history_merge_records(Heap *heap, History *history, i32 first_index, i32 last_index){
Assert(first_index < last_index);
Node *first_node = history__to_node(history, first_index);
Node *last_node = history__to_node(history, last_index );
Assert(first_node != &history->records && first_node != 0);
Assert(last_node != &history->records && last_node != 0);
Record *new_record = history__allocate_record(heap, history);
Node *left = first_node->prev;
Node *right = last_node->next;
left->next = &new_record->node;
new_record->node.prev = left;
right->prev = &new_record->node;
new_record->node.next = right;
// NOTE(allen): here we remove (last_index - first_index + 1) nodes, and insert 1 node
// which simplifies to this:
history->record_count -= last_index - first_index;
Record *first_record = CastFromMember(Record, node, first_node);
Record *last_record = CastFromMember(Record, node, last_node);
new_record->restore_point = first_record->restore_point;
new_record->edit_number = last_record->edit_number;
new_record->kind = RecordKind_Group;
Node *new_sentinel = &new_record->group.children;
dll_init_sentinel(new_sentinel);
Node *one_past_last_node = last_node->next;
i32 count = 0;
for (Node *node = first_node, *next = 0;
node != one_past_last_node;
node = next){
next = node->next;
Record *record = CastFromMember(Record, node, node);
switch (record->kind){
case RecordKind_Single:
{
dll_insert_back(new_sentinel, &record->node);
count += 1;
}break;
case RecordKind_Batch:
{
dll_insert_back(new_sentinel, &record->node);
count += 1;
}break;
case RecordKind_Group:
{
Node *first = record->group.children.next;
Node *last = record->group.children.prev;
Assert(first != &record->group.children);
Assert(last != &record->group.children);
Node *right = new_sentinel;
Node *left = new_sentinel->prev;
left->next = first;
first->prev = left;
last->next = right;
right->prev = last;
count += record->group.count;
}break;
default:
{
InvalidCodePath;
}break;
}
}
new_record->group.count = count;
}
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// BOTTOM