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import {printTree} from 'tree-dump/lib/printTree';
import {PersistedSlice} from './PersistedSlice';
import {Timespan, compare, tss} from '../../../json-crdt-patch/clock';
import type {Range} from '../rga/Range';
import {updateRga} from '../../../json-crdt/hash';
import {CONST, updateNum} from '../../../json-hash';
import {SliceBehavior, SliceHeaderShift, SliceTupleIndex} from './constants';
import {MarkerSlice} from './MarkerSlice';
import {VecNode} from '../../../json-crdt/nodes';
import {Chars} from '../constants';
import {Anchor} from '../rga/constants';
import type {Slice, SliceType} from './types';
import type {ITimespanStruct, ITimestampStruct} from '../../../json-crdt-patch/clock';
import type {Stateful} from '../types';
import type {Printable} from 'tree-dump/lib/types';
import type {ArrChunk, ArrNode} from '../../../json-crdt/nodes';
import type {AbstractRga} from '../../../json-crdt/nodes/rga';
import type {Peritext} from '../Peritext';
import type {UndefIterator} from '../../../util/iterator';
export class Slices<T = string> implements Stateful, Printable {
private list = new AvlMap<ITimestampStruct, PersistedSlice<T>>(compare);
protected readonly rga: AbstractRga<T>;
constructor(
/** The text RGA. */
protected readonly txt: Peritext<T>,
/** The `arr` node, used as a set, where slices are stored. */
public readonly set: ArrNode,
) {
this.rga = txt.str as unknown as AbstractRga<T>;
}
public ins<
S extends PersistedSlice<T>,
K extends new (
...args: ConstructorParameters<typeof PersistedSlice<T>>
) => S,
>(
range: Range<T>,
behavior: SliceBehavior,
type: SliceType,
data?: unknown,
Klass: K = behavior === SliceBehavior.Marker ? <any>MarkerSlice : PersistedSlice,
): S {
const slicesModel = this.set.doc;
const set = this.set;
const api = slicesModel.api;
const builder = api.builder;
const tupleId = builder.vec();
const start = range.start.clone();
const end = range.end.clone();
const header =
(behavior << SliceHeaderShift.Behavior) +
(start.anchor << SliceHeaderShift.X1Anchor) +
(end.anchor << SliceHeaderShift.X2Anchor);
const headerId = builder.const(header);
const x1Id = builder.const(start.id);
const x2Id = builder.const(compare(start.id, end.id) === 0 ? 0 : end.id);
const subtypeId = builder.const(type);
const tupleKeysUpdate: [key: number, value: ITimestampStruct][] = [
[SliceTupleIndex.Header, headerId],
[SliceTupleIndex.X1, x1Id],
[SliceTupleIndex.X2, x2Id],
[SliceTupleIndex.Type, subtypeId],
];
if (data !== undefined) tupleKeysUpdate.push([SliceTupleIndex.Data, builder.json(data)]);
builder.insVec(tupleId, tupleKeysUpdate);
const chunkId = builder.insArr(set.id, set.id, [tupleId]);
// TODO: Consider using `s` schema here.
api.apply();
const tuple = slicesModel.index.get(tupleId) as VecNode;
const chunk = set.findById(chunkId)!;
// TODO: Need to check if split slice text was deleted
const slice = new Klass(slicesModel, this.txt, chunk, tuple, behavior, type, start, end);
this.list.set(chunk.id, slice);
return slice;
}
public insMarker(range: Range<T>, type: SliceType, data?: unknown | ITimestampStruct): MarkerSlice<T> {
return this.ins(range, SliceBehavior.Marker, type, data) as MarkerSlice<T>;
}
public insMarkerAfter(
after: ITimestampStruct,
type: SliceType,
data?: unknown,
separator: string = Chars.BlockSplitSentinel,
): MarkerSlice<T> {
// TODO: test condition when cursors is at absolute or relative starts
const txt = this.txt;
const api = txt.model.api;
const builder = api.builder;
/**
* We skip one clock cycle to prevent Block-wise RGA from merging adjacent
* characters. We want the marker chunk to always be its own distinct chunk.
*/
builder.nop(1);
// TODO: Handle case when marker is inserted at the abs start, prevent abs start/end inserts.
const textId = builder.insStr(txt.str.id, after, separator);
api.apply();
const point = txt.point(textId, Anchor.Before);
const range = txt.range(point, point.clone());
return this.insMarker(range, type, data);
}
public insStack(range: Range<T>, type: SliceType, data?: unknown | ITimestampStruct): PersistedSlice<T> {
return this.ins(range, SliceBehavior.Many, type, data);
}
public insOverwrite(range: Range<T>, type: SliceType, data?: unknown | ITimestampStruct): PersistedSlice<T> {
return this.ins(range, SliceBehavior.One, type, data);
}
public insErase(range: Range<T>, type: SliceType, data?: unknown | ITimestampStruct): PersistedSlice<T> {
return this.ins(range, SliceBehavior.Erase, type, data);
}
protected unpack(chunk: ArrChunk): PersistedSlice<T> {
const txt = this.txt;
const model = this.set.doc;
const tupleId = chunk.data ? chunk.data[0] : undefined;
Iif (!tupleId) throw new Error('SLICE_NOT_FOUND');
const tuple = model.index.get(tupleId);
Iif (!(tuple instanceof VecNode)) throw new Error('NOT_TUPLE');
let slice = PersistedSlice.deserialize<T>(model, txt, chunk, tuple);
if (slice.isSplit())
slice = new MarkerSlice<T>(model, txt, chunk, tuple, slice.behavior, slice.type, slice.start, slice.end);
return slice;
}
public get(id: ITimestampStruct): PersistedSlice<T> | undefined {
return this.list.get(id);
}
public del(id: ITimestampStruct): void {
this.list.del(id);
const set = this.set;
const api = set.doc.api;
if (!set.findById(id)) return;
// TODO: Is it worth checking if the slice is already deleted?
api.builder.del(set.id, [tss(id.sid, id.time, 1)]);
api.apply();
}
public delSlices(slices: Iterable<Slice<T>>): boolean {
const set = this.set;
const doc = set.doc;
const api = doc.api;
const spans: ITimespanStruct[] = [];
for (const slice of slices) {
if (slice instanceof PersistedSlice) {
const id = slice.id;
if (!set.findById(id)) continue;
spans.push(new Timespan(id.sid, id.time, 1));
}
}
if (!spans.length) return false;
api.builder.del(this.set.id, spans);
api.apply();
return true;
}
public size(): number {
return this.list._size;
}
public iterator0(): UndefIterator<Slice<T>> {
const iterator = this.list.iterator0();
return () => iterator()?.v;
}
public forEach(callback: (item: Slice<T>) => void): void {
// biome-ignore lint: list is not iterable
this.list.forEach((node) => callback(node.v));
}
// ----------------------------------------------------------------- Stateful
private _topologyHash: number = 0;
public hash: number = 0;
public refresh(): number {
const topologyHash = updateRga(CONST.START_STATE, this.set);
if (topologyHash !== this._topologyHash) {
this._topologyHash = topologyHash;
let chunk: ArrChunk | undefined;
for (const iterator = this.set.iterator(); (chunk = iterator()); ) {
const item = this.list.get(chunk.id);
if (chunk.del) {
if (item) this.list.del(chunk.id);
} else {
if (!item) this.list.set(chunk.id, this.unpack(chunk));
}
}
}
let hash: number = topologyHash;
// biome-ignore lint: slices is not iterable
this.list.forEach(({v: item}) => {
item.refresh();
hash = updateNum(hash, item.hash);
});
return (this.hash = hash);
}
// ---------------------------------------------------------------- Printable
public toStringName(): string {
return 'Slices';
}
public toString(tab: string = ''): string {
return (
this.toStringName() +
printTree(
tab,
[...this.list.entries()].map(
({v}) =>
(tab) =>
v.toString(tab),
),
)
);
}
}
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