448 lines
16 KiB
C++
448 lines
16 KiB
C++
/*
|
|
* Mr. 4th Dimention - Allen Webster
|
|
*
|
|
* 24.03.2018
|
|
*
|
|
* History
|
|
*/
|
|
|
|
// TOP
|
|
|
|
internal Node*
|
|
history__to_node(Node *sentinel, i32 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 void
|
|
history__push_back_record_ptr(Base_Allocator *allocator, Record_Ptr_Lookup_Table *lookup, Record *record){
|
|
if (lookup->records == 0 || lookup->count == lookup->max){
|
|
i32 new_max = clamp_bot(1024, lookup->max*2);
|
|
String_Const_u8 new_memory = base_allocate(allocator, sizeof(Record*)*new_max);
|
|
Record **new_records = (Record**)new_memory.str;
|
|
block_copy(new_records, lookup->records, sizeof(*new_records)*lookup->count);
|
|
if (lookup->records != 0){
|
|
base_free(allocator, lookup->records);
|
|
}
|
|
lookup->records = new_records;
|
|
lookup->max = new_max;
|
|
}
|
|
Assert(lookup->count < lookup->max);
|
|
lookup->records[lookup->count] = record;
|
|
lookup->count += 1;
|
|
}
|
|
|
|
internal void
|
|
history__shrink_array(Record_Ptr_Lookup_Table *lookup, i32 new_count){
|
|
Assert(0 <= new_count && new_count <= lookup->count);
|
|
lookup->count = new_count;
|
|
}
|
|
|
|
internal void
|
|
history__merge_record_ptr_range_to_one_ptr(Record_Ptr_Lookup_Table *lookup, i32 first_one_based, i32 last_one_based, Record *record){
|
|
i32 first = first_one_based - 1;
|
|
i32 one_past_last = last_one_based;
|
|
Assert(0 <= first && first <= one_past_last && one_past_last <= lookup->count);
|
|
if (first < one_past_last){
|
|
i32 shift = 1 + first - one_past_last;
|
|
block_copy(lookup->records + one_past_last + shift, lookup->records + one_past_last, lookup->count - one_past_last);
|
|
lookup->count += shift;
|
|
}
|
|
lookup->records[first] = record;
|
|
}
|
|
|
|
internal Node*
|
|
history__to_node(History *history, i32 index){
|
|
Node *result = 0;
|
|
if (index == 0){
|
|
result = &history->records;
|
|
}
|
|
else if (0 < index && index <= history->record_count){
|
|
Record_Ptr_Lookup_Table *lookup = &history->record_lookup;
|
|
Assert(lookup->count == history->record_count);
|
|
result = &lookup->records[index - 1]->node;
|
|
}
|
|
return(result);
|
|
}
|
|
|
|
////////////////////////////////
|
|
|
|
internal Record*
|
|
history__allocate_record(History *history){
|
|
Node *sentinel = &history->free_records;
|
|
Node *new_node = sentinel->next;
|
|
if (new_node == sentinel){
|
|
i32 new_record_count = 1024;
|
|
String_Const_u8 new_memory = base_allocate(&history->heap_wrapper, sizeof(Record)*new_record_count);
|
|
void *memory = new_memory.str;
|
|
|
|
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){
|
|
i32 original = global_history->edit_grouping_counter;
|
|
global_history->edit_grouping_counter = clamp_bot(0, global_history->edit_grouping_counter + adjustment);
|
|
if (global_history->edit_grouping_counter == 0 && original > 0){
|
|
global_history->edit_number_counter += 1;
|
|
}
|
|
}
|
|
|
|
internal void
|
|
history_init(Thread_Context *tctx, Models *models, History *history){
|
|
history->activated = true;
|
|
history->arena = make_arena_system();
|
|
heap_init(&history->heap, tctx->allocator);
|
|
history->heap_wrapper = base_allocator_on_heap(&history->heap);
|
|
dll_init_sentinel(&history->free_records);
|
|
dll_init_sentinel(&history->records);
|
|
history->record_count = 0;
|
|
block_zero_struct(&history->record_lookup);
|
|
}
|
|
|
|
internal b32
|
|
history_is_activated(History *history){
|
|
return(history->activated);
|
|
}
|
|
|
|
internal void
|
|
history_free(Thread_Context *tctx, History *history){
|
|
if (history->activated){
|
|
linalloc_clear(&history->arena);
|
|
heap_free_all(&history->heap);
|
|
block_zero_struct(history);
|
|
}
|
|
}
|
|
|
|
internal i32
|
|
history_get_record_count(History *history){
|
|
i32 result = 0;
|
|
if (history->activated){
|
|
result = history->record_count;
|
|
}
|
|
return(result);
|
|
}
|
|
|
|
internal Record*
|
|
history_get_record(History *history, i32 index){
|
|
Record *result = 0;
|
|
if (history->activated){
|
|
Node *node = history__to_node(history, index);
|
|
if (node != 0){
|
|
result = CastFromMember(Record, node, node);
|
|
}
|
|
}
|
|
return(result);
|
|
}
|
|
|
|
internal Record*
|
|
history_get_sub_record(Record *record, i32 sub_index_one_based){
|
|
Record *result = 0;
|
|
if (record->kind == RecordKind_Group){
|
|
if (0 < sub_index_one_based && sub_index_one_based <= record->group.count){
|
|
Node *node = history__to_node(&record->group.children, sub_index_one_based);
|
|
if (node != 0){
|
|
result = CastFromMember(Record, node, node);
|
|
}
|
|
}
|
|
}
|
|
return(result);
|
|
}
|
|
|
|
internal Record*
|
|
history_get_dummy_record(History *history){
|
|
Record *result = 0;
|
|
if (history->activated){
|
|
result = CastFromMember(Record, node, &history->records);
|
|
}
|
|
return(result);
|
|
}
|
|
|
|
internal void
|
|
history__stash_record(History *history, Record *new_record){
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
dll_insert_back(&history->records, &new_record->node);
|
|
history->record_count += 1;
|
|
history__push_back_record_ptr(&history->heap_wrapper, &history->record_lookup, new_record);
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
}
|
|
|
|
internal void
|
|
history__free_single_node(History *history, Node *node){
|
|
dll_remove(node);
|
|
dll_insert(&history->free_records, node);
|
|
}
|
|
|
|
internal void
|
|
history__free_nodes(History *history, i32 first_index, Node *first_node, Node *last_node){
|
|
if (first_node == last_node){
|
|
history__free_single_node(history, 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;
|
|
history__shrink_array(&history->record_lookup, history->record_count);
|
|
}
|
|
|
|
internal void
|
|
history_record_edit(Global_History *global_history, History *history, Gap_Buffer *buffer,
|
|
i64 pos_before_edit, Edit edit){
|
|
if (history->activated){
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
|
|
Record *new_record = history__allocate_record(history);
|
|
history__stash_record(history, new_record);
|
|
|
|
new_record->restore_point = begin_temp(&history->arena);
|
|
if (pos_before_edit >= 0){
|
|
new_record->pos_before_edit = pos_before_edit;
|
|
}
|
|
else{
|
|
new_record->pos_before_edit = edit.range.min;
|
|
}
|
|
|
|
new_record->edit_number = global_history_get_edit_number(global_history);
|
|
|
|
new_record->kind = RecordKind_Single;
|
|
|
|
new_record->single.forward_text = push_string_copy(&history->arena, edit.text);
|
|
new_record->single.backward_text = buffer_stringify(&history->arena, buffer, edit.range);
|
|
new_record->single.first = edit.range.first;
|
|
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
}
|
|
}
|
|
|
|
internal void
|
|
history_dump_records_after_index(History *history, i32 index){
|
|
if (history->activated){
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
|
|
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(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);
|
|
}
|
|
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
}
|
|
}
|
|
|
|
internal void
|
|
history__optimize_group(Arena *scratch, History *history, Record *record){
|
|
Assert(record->kind == RecordKind_Group);
|
|
for (;;){
|
|
Record *right = CastFromMember(Record, node, record->group.children.prev);
|
|
if (record->group.count == 1){
|
|
Record *child = right;
|
|
record->restore_point = child->restore_point;
|
|
record->pos_before_edit = child->pos_before_edit;
|
|
record->edit_number = child->edit_number;
|
|
record->kind = RecordKind_Single;
|
|
record->single = child->single;
|
|
// NOTE(allen): don't use "free" because the child node is no longer linked
|
|
// to a valid sentinel, and removing it first (as free does) will mess with
|
|
// the data in record->single
|
|
dll_insert(&history->free_records, &child->node);
|
|
break;
|
|
}
|
|
Record *left = CastFromMember(Record, node, right->node.prev);
|
|
if (right->kind == RecordKind_Single && left->kind == RecordKind_Single){
|
|
b32 do_merge = false;
|
|
|
|
Temp_Memory temp = begin_temp(scratch);
|
|
i64 new_length_forward = left->single.forward_text.size + right->single.forward_text.size ;
|
|
i64 new_length_backward = left->single.backward_text.size + right->single.backward_text.size;
|
|
|
|
String_Const_u8 merged_forward = {};
|
|
String_Const_u8 merged_backward = {};
|
|
|
|
i64 merged_first = 0;
|
|
if (left->single.first + (i64)left->single.forward_text.size == right->single.first){
|
|
do_merge = true;
|
|
merged_forward = push_u8_stringf(scratch, "%.*s%.*s",
|
|
string_expand(left->single.forward_text),
|
|
string_expand(right->single.forward_text));
|
|
merged_backward = push_u8_stringf(scratch, "%.*s%.*s",
|
|
string_expand(left->single.backward_text),
|
|
string_expand(right->single.backward_text));
|
|
merged_first = left->single.first;
|
|
}
|
|
else if (right->single.first + (i64)right->single.backward_text.size == left->single.first){
|
|
do_merge = true;
|
|
merged_forward = push_u8_stringf(scratch, "%.*s%.*s",
|
|
string_expand(right->single.forward_text),
|
|
string_expand(left->single.forward_text));
|
|
merged_backward = push_u8_stringf(scratch, "%.*s%.*s",
|
|
string_expand(right->single.backward_text),
|
|
string_expand(left->single.backward_text));
|
|
merged_first = right->single.first;
|
|
}
|
|
else{
|
|
break;
|
|
}
|
|
|
|
if (do_merge){
|
|
end_temp(left->restore_point);
|
|
|
|
left->edit_number = right->edit_number;
|
|
left->single.first = merged_first;
|
|
left->single.forward_text = push_string_copy(&history->arena, merged_forward);
|
|
left->single.backward_text = push_string_copy(&history->arena, merged_backward);
|
|
|
|
history__free_single_node(history, &right->node);
|
|
record->group.count -= 1;
|
|
}
|
|
|
|
end_temp(temp);
|
|
}
|
|
else{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
internal void
|
|
history_merge_records(Arena *scratch, History *history, i32 first_index, i32 last_index){
|
|
if (history->activated){
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
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(history);
|
|
|
|
// 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;
|
|
|
|
Node *left = first_node->prev;
|
|
dll_remove_multiple(first_node, last_node);
|
|
dll_insert(left, &new_record->node);
|
|
|
|
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->pos_before_edit = first_record->pos_before_edit;
|
|
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);
|
|
|
|
i32 count = 0;
|
|
for (Node *node = first_node, *next = 0;
|
|
node != 0;
|
|
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_Group:
|
|
{
|
|
Node *first = record->group.children.next;
|
|
Node *last = record->group.children.prev;
|
|
Assert(first != &record->group.children);
|
|
Assert(last != &record->group.children);
|
|
|
|
dll_insert_multiple_back(new_sentinel, first, last);
|
|
count += record->group.count;
|
|
|
|
// TODO(allen): free the record for the old group!?
|
|
}break;
|
|
|
|
default:
|
|
{
|
|
InvalidPath;
|
|
}break;
|
|
}
|
|
}
|
|
|
|
new_record->group.count = count;
|
|
|
|
history__merge_record_ptr_range_to_one_ptr(&history->record_lookup, first_index, last_index, new_record);
|
|
Assert(history->record_lookup.count == history->record_count);
|
|
|
|
if (first_index == history->record_count){
|
|
history__optimize_group(scratch, history, new_record);
|
|
}
|
|
}
|
|
}
|
|
|
|
// BOTTOM
|
|
|