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import {
interval,
type ITimespanStruct,
type ITimestampStruct,
ClockVector,
ServerClockVector,
Timestamp,
} from '../../clock';
import type {Patch} from '../../Patch';
import {PatchBuilder} from '../../PatchBuilder';
import {SESSION} from '../../constants';
import {CborDecoder} from '@jsonjoy.com/json-pack/lib/cbor/CborDecoder';
import {JsonCrdtPatchOpcode} from '../../constants';
/**
* JSON CRDT Patch "binary" codec decoder.
*/
export class Decoder extends CborDecoder<CrdtReader> {
protected builder!: PatchBuilder;
private patchSid?: number;
/**
* Creates a new JSON CRDT patch decoder.
*
* @param reader An optional custom implementation of a CRDT decoder.
*/
constructor(reader: CrdtReader = new CrdtReader()) {
super(reader);
}
/**
* Decodes a JSON CRDT patch from a binary blob.
*
* @param data Binary data to decode.
* @returns A JSON CRDT patch.
*/
public decode(data: Uint8Array): Patch {
this.reader.reset(data);
return this.readPatch();
}
public readPatch(): Patch {
const reader = this.reader;
const sid = reader.vu57();
const time = reader.vu57();
const isServerClock = sid === SESSION.SERVER;
const clock = isServerClock ? new ServerClockVector(SESSION.SERVER, time) : new ClockVector(sid, time);
this.patchSid = clock.sid;
const builder = (this.builder = new PatchBuilder(clock));
const map = this.val();
if (map instanceof Array) builder.patch.meta = map[0];
this.decodeOperations();
return builder.patch;
}
protected decodeId(): ITimestampStruct {
const reader = this.reader;
const [isSessionDifferent, x] = reader.b1vu56();
return isSessionDifferent ? new Timestamp(reader.vu57(), x) : new Timestamp(this.patchSid!, x);
}
protected decodeTss(): ITimespanStruct {
const id = this.decodeId();
const span = this.reader.vu57();
return interval(id, 0, span);
}
protected decodeOperations(): void {
const reader = this.reader;
const length = reader.vu57();
for (let i = 0; i < length; i++) this.decodeOperation();
}
protected decodeOperation(): void {
const builder = this.builder;
const reader = this.reader;
const octet = reader.u8();
const opcode = octet >> 3;
switch (opcode) {
case JsonCrdtPatchOpcode.new_con: {
const length = octet & 0b111;
builder.const(!length ? this.val() : this.decodeId());
break;
}
case JsonCrdtPatchOpcode.new_val: {
builder.val();
break;
}
case JsonCrdtPatchOpcode.new_obj: {
builder.obj();
break;
}
case JsonCrdtPatchOpcode.new_vec: {
builder.vec();
break;
}
case JsonCrdtPatchOpcode.new_str: {
builder.str();
break;
}
case JsonCrdtPatchOpcode.new_bin: {
builder.bin();
break;
}
case JsonCrdtPatchOpcode.new_arr: {
builder.arr();
break;
}
case JsonCrdtPatchOpcode.ins_val: {
const obj = this.decodeId();
const val = this.decodeId();
builder.setVal(obj, val);
break;
}
case JsonCrdtPatchOpcode.ins_obj: {
const length = octet & 0b111 || reader.vu57();
const obj = this.decodeId();
const tuples: [key: string, value: ITimestampStruct][] = [];
for (let i = 0; i < length; i++) {
const key = this.val();
Iif (typeof key !== 'string') continue;
const value = this.decodeId();
tuples.push([key, value]);
}
builder.insObj(obj, tuples);
break;
}
case JsonCrdtPatchOpcode.ins_vec: {
const length = octet & 0b111 || reader.vu57();
const obj = this.decodeId();
const tuples: [index: number, value: ITimestampStruct][] = [];
for (let i = 0; i < length; i++) {
const index = this.val();
Iif (typeof index !== 'number') continue;
const value = this.decodeId();
tuples.push([index, value]);
}
builder.insVec(obj, tuples);
break;
}
case JsonCrdtPatchOpcode.ins_str: {
const length = octet & 0b111 || reader.vu57();
const obj = this.decodeId();
const after = this.decodeId();
const str = reader.utf8(length);
builder.insStr(obj, after, str);
break;
}
case JsonCrdtPatchOpcode.ins_bin: {
const length = octet & 0b111 || reader.vu57();
const obj = this.decodeId();
const after = this.decodeId();
const buf = reader.buf(length);
Iif (!(buf instanceof Uint8Array)) return;
builder.insBin(obj, after, buf);
break;
}
case JsonCrdtPatchOpcode.ins_arr: {
const length = octet & 0b111 || reader.vu57();
const obj = this.decodeId();
const after = this.decodeId();
const elements: ITimestampStruct[] = [];
for (let i = 0; i < length; i++) elements.push(this.decodeId());
builder.insArr(obj, after, elements);
break;
}
case JsonCrdtPatchOpcode.del: {
const length = octet & 0b111 || reader.vu57();
const obj = this.decodeId();
const what: ITimespanStruct[] = [];
for (let i = 0; i < length; i++) what.push(this.decodeTss());
builder.del(obj, what);
break;
}
case JsonCrdtPatchOpcode.nop: {
const length = octet & 0b111 || reader.vu57();
builder.nop(length);
break;
}
default: {
throw new Error('UNKNOWN_OP');
}
}
}
}
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