438 lines
15 KiB
C++
438 lines
15 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 24.03.2018
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*
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* History
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*/
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// TOP
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internal Node*
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history__to_node(Node *sentinel, i32 index){
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Node *result = 0;
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i32 counter = 0;
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Node *it = sentinel;
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do{
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if (counter == index){
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result = it;
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break;
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}
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counter += 1;
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it = it->next;
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} while (it != sentinel);
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return(result);
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}
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internal void
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history__push_back_record_ptr(Base_Allocator *allocator, Record_Ptr_Lookup_Table *lookup, Record *record){
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if (lookup->records == 0 || lookup->count == lookup->max){
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i32 new_max = clamp_bot(1024, lookup->max*2);
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Data new_memory = base_allocate(allocator, sizeof(Record*)*new_max);
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Record **new_records = (Record**)new_memory.data;
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block_copy(new_records, lookup->records, sizeof(*new_records)*lookup->count);
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if (lookup->records != 0){
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base_free(allocator, lookup->records);
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}
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lookup->records = new_records;
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lookup->max = new_max;
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}
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Assert(lookup->count < lookup->max);
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lookup->records[lookup->count] = record;
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lookup->count += 1;
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}
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internal void
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history__shrink_array(Record_Ptr_Lookup_Table *lookup, i32 new_count){
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Assert(0 <= new_count && new_count <= lookup->count);
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lookup->count = new_count;
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}
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internal void
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history__merge_record_ptr_range_to_one_ptr(Record_Ptr_Lookup_Table *lookup, i32 first_one_based, i32 last_one_based, Record *record){
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i32 first = first_one_based - 1;
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i32 one_past_last = last_one_based;
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Assert(0 <= first && first <= one_past_last && one_past_last <= lookup->count);
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if (first < one_past_last){
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i32 shift = 1 + first - one_past_last;
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block_copy(lookup->records + one_past_last + shift, lookup->records + one_past_last, lookup->count - one_past_last);
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lookup->count += shift;
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}
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lookup->records[first] = record;
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}
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internal Node*
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history__to_node(History *history, i32 index){
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Node *result = 0;
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if (index == 0){
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result = &history->records;
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}
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else if (0 < index && index <= history->record_count){
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Record_Ptr_Lookup_Table *lookup = &history->record_lookup;
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Assert(lookup->count == history->record_count);
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result = &lookup->records[index - 1]->node;
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}
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return(result);
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}
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////////////////////////////////
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internal Record*
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history__allocate_record(History *history){
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Node *sentinel = &history->free_records;
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Node *new_node = sentinel->next;
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if (new_node == sentinel){
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i32 new_record_count = 1024;
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Data new_memory = base_allocate(&history->heap_wrapper, sizeof(Record)*new_record_count);
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void *memory = new_memory.data;
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Record *new_record = (Record*)memory;
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sentinel->next = &new_record->node;
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new_record->node.prev = sentinel;
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for (i32 i = 1; i < new_record_count; i += 1, new_record += 1){
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new_record[0].node.next = &new_record[1].node;
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new_record[1].node.prev = &new_record[0].node;
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}
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new_record[0].node.next = sentinel;
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sentinel->prev = &new_record[0].node;
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new_node = &((Record*)memory)->node;
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}
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dll_remove(new_node);
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Record *record = CastFromMember(Record, node, new_node);
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block_zero_struct(record);
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return(record);
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}
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internal void
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global_history_init(Global_History *global_history){
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global_history->edit_number_counter = 0;
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global_history->edit_grouping_counter = 0;
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}
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internal i32
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global_history_get_edit_number(Global_History *global_history){
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i32 result = global_history->edit_number_counter;
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if (global_history->edit_grouping_counter == 0){
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global_history->edit_number_counter += 1;
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}
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return(result);
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}
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internal void
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global_history_adjust_edit_grouping_counter(Global_History *global_history, i32 adjustment){
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i32 original = global_history->edit_grouping_counter;
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global_history->edit_grouping_counter = clamp_bot(0, global_history->edit_grouping_counter + adjustment);
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if (global_history->edit_grouping_counter == 0 && original > 0){
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global_history->edit_number_counter += 1;
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}
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}
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internal void
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history_init(Thread_Context *tctx, Models *models, History *history){
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history->activated = true;
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history->arena = reserve_arena(tctx, KB(32));
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heap_init(&history->heap, tctx->allocator);
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history->heap_wrapper = base_allocator_on_heap(&history->heap);
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dll_init_sentinel(&history->free_records);
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dll_init_sentinel(&history->records);
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history->record_count = 0;
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block_zero_struct(&history->record_lookup);
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}
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internal b32
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history_is_activated(History *history){
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return(history->activated);
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}
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internal void
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history_free(Thread_Context *tctx, History *history){
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if (history->activated){
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release_arena(tctx, history->arena);
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heap_free_all(&history->heap);
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block_zero_struct(history);
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}
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}
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internal i32
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history_get_record_count(History *history){
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i32 result = 0;
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if (history->activated){
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result = history->record_count;
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}
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return(result);
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}
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internal Record*
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history_get_record(History *history, i32 index){
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Record *result = 0;
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if (history->activated){
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Node *node = history__to_node(history, index);
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if (node != 0){
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result = CastFromMember(Record, node, node);
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}
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}
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return(result);
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}
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internal Record*
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history_get_sub_record(Record *record, i32 sub_index_one_based){
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Record *result = 0;
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if (record->kind == RecordKind_Group){
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if (0 < sub_index_one_based && sub_index_one_based <= record->group.count){
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Node *node = history__to_node(&record->group.children, sub_index_one_based);
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if (node != 0){
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result = CastFromMember(Record, node, node);
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}
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}
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}
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return(result);
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}
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internal Record*
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history_get_dummy_record(History *history){
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Record *result = 0;
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if (history->activated){
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result = CastFromMember(Record, node, &history->records);
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}
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return(result);
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}
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internal void
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history__stash_record(History *history, Record *new_record){
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Assert(history->record_lookup.count == history->record_count);
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dll_insert_back(&history->records, &new_record->node);
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history->record_count += 1;
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history__push_back_record_ptr(&history->heap_wrapper, &history->record_lookup, new_record);
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Assert(history->record_lookup.count == history->record_count);
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}
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internal void
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history__free_single_node(History *history, Node *node){
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dll_remove(node);
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dll_insert(&history->free_records, node);
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}
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internal void
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history__free_nodes(History *history, i32 first_index, Node *first_node, Node *last_node){
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if (first_node == last_node){
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history__free_single_node(history, first_node);
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}
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else{
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{
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Node *left = first_node->prev;
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Node *right = last_node->next;
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left->next = right;
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right->prev = left;
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}
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{
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Node *left = &history->free_records;
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Node *right = left->next;
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left->next = first_node;
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first_node->prev = left;
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right->prev = last_node;
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last_node->next = right;
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}
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}
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Assert(first_index != 0);
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history->record_count = first_index - 1;
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history__shrink_array(&history->record_lookup, history->record_count);
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}
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internal void
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history_record_edit(Global_History *global_history, History *history, Gap_Buffer *buffer, Edit edit){
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if (history->activated){
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Assert(history->record_lookup.count == history->record_count);
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Record *new_record = history__allocate_record(history);
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history__stash_record(history, new_record);
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new_record->restore_point = begin_temp(history->arena);
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new_record->edit_number = global_history_get_edit_number(global_history);
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new_record->kind = RecordKind_Single;
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new_record->single.forward_text = push_string_copy(history->arena, edit.text);
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new_record->single.backward_text = buffer_stringify(history->arena, buffer, edit.range);
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new_record->single.first = edit.range.first;
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Assert(history->record_lookup.count == history->record_count);
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}
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}
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internal void
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history_dump_records_after_index(History *history, i32 index){
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if (history->activated){
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Assert(history->record_lookup.count == history->record_count);
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Assert(0 <= index && index <= history->record_count);
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if (index < history->record_count){
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Node *node = history__to_node(history, index);
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Node *first_node_to_clear = node->next;
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Node *sentinel = &history->records;
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Assert(first_node_to_clear != sentinel);
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Record *first_record_to_clear = CastFromMember(Record, node, first_node_to_clear);
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end_temp(first_record_to_clear->restore_point);
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Node *last_node_to_clear = sentinel->prev;
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history__free_nodes(history, index + 1, first_node_to_clear, last_node_to_clear);
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}
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Assert(history->record_lookup.count == history->record_count);
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}
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}
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internal void
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history__optimize_group(Arena *scratch, History *history, Record *record){
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Assert(record->kind == RecordKind_Group);
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for (;;){
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Record *right = CastFromMember(Record, node, record->group.children.prev);
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if (record->group.count == 1){
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Record *child = right;
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record->restore_point = child->restore_point;
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record->edit_number = child->edit_number;
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record->kind = RecordKind_Single;
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record->single = child->single;
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// NOTE(allen): don't use "free" because the child node is no longer linked
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// to a valid sentinel, and removing it first (as free does) will mess with
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// the data in record->single
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dll_insert(&history->free_records, &child->node);
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break;
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}
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Record *left = CastFromMember(Record, node, right->node.prev);
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if (right->kind == RecordKind_Single && left->kind == RecordKind_Single){
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b32 do_merge = false;
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Temp_Memory temp = begin_temp(scratch);
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i64 new_length_forward = left->single.forward_text.size + right->single.forward_text.size ;
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i64 new_length_backward = left->single.backward_text.size + right->single.backward_text.size;
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String_Const_u8 merged_forward = {};
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String_Const_u8 merged_backward = {};
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i64 merged_first = 0;
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if (left->single.first + (i64)left->single.forward_text.size == right->single.first){
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do_merge = true;
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merged_forward = push_u8_stringf(scratch, "%.*s%.*s",
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string_expand(left->single.forward_text),
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string_expand(right->single.forward_text));
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merged_backward = push_u8_stringf(scratch, "%.*s%.*s",
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string_expand(left->single.backward_text),
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string_expand(right->single.backward_text));
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merged_first = left->single.first;
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}
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else if (right->single.first + (i64)right->single.backward_text.size == left->single.first){
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do_merge = true;
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merged_forward = push_u8_stringf(scratch, "%.*s%.*s",
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string_expand(right->single.forward_text),
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string_expand(left->single.forward_text));
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merged_backward = push_u8_stringf(scratch, "%.*s%.*s",
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string_expand(right->single.backward_text),
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string_expand(left->single.backward_text));
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merged_first = right->single.first;
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}
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else{
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break;
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}
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if (do_merge){
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end_temp(left->restore_point);
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left->edit_number = right->edit_number;
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left->single.first = merged_first;
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left->single.forward_text = push_string_copy(history->arena, merged_forward);
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left->single.backward_text = push_string_copy(history->arena, merged_backward);
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history__free_single_node(history, &right->node);
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record->group.count -= 1;
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}
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end_temp(temp);
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}
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else{
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break;
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}
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}
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}
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internal void
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history_merge_records(Arena *scratch, History *history, i32 first_index, i32 last_index){
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if (history->activated){
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Assert(history->record_lookup.count == history->record_count);
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Assert(first_index < last_index);
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Node *first_node = history__to_node(history, first_index);
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Node *last_node = history__to_node(history, last_index );
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Assert(first_node != &history->records && first_node != 0);
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Assert(last_node != &history->records && last_node != 0);
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Record *new_record = history__allocate_record(history);
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// NOTE(allen): here we remove (last_index - first_index + 1) nodes, and insert 1 node
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// which simplifies to this:
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history->record_count -= last_index - first_index;
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Node *left = first_node->prev;
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dll_remove_multiple(first_node, last_node);
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dll_insert(left, &new_record->node);
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Record *first_record = CastFromMember(Record, node, first_node);
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Record *last_record = CastFromMember(Record, node, last_node);
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new_record->restore_point = first_record->restore_point;
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new_record->edit_number = last_record->edit_number;
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new_record->kind = RecordKind_Group;
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Node *new_sentinel = &new_record->group.children;
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dll_init_sentinel(new_sentinel);
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i32 count = 0;
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for (Node *node = first_node, *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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Record *record = CastFromMember(Record, node, node);
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switch (record->kind){
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case RecordKind_Single:
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{
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dll_insert_back(new_sentinel, &record->node);
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count += 1;
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}break;
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case RecordKind_Group:
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{
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Node *first = record->group.children.next;
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Node *last = record->group.children.prev;
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Assert(first != &record->group.children);
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Assert(last != &record->group.children);
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dll_insert_multiple_back(new_sentinel, first, last);
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count += record->group.count;
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// TODO(allen): free the record for the old group!?
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}break;
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default:
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{
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InvalidPath;
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}break;
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}
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}
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new_record->group.count = count;
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history__merge_record_ptr_range_to_one_ptr(&history->record_lookup, first_index, last_index, new_record);
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Assert(history->record_lookup.count == history->record_count);
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if (first_index == history->record_count){
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history__optimize_group(scratch, history, new_record);
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}
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}
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}
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// BOTTOM
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