Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {ClockTable} from '../../../../json-crdt-patch/codec/clock/ClockTable';
import {CrdtReader} from '../../../../json-crdt-patch/util/binary/CrdtReader';
import type {IndexedFields, FieldName, IndexedNodeFields} from './types';
import {type ITimestampStruct, type IClockVector, Timestamp, ClockVector} from '../../../../json-crdt-patch/clock';
import {Model, UNDEFINED} from '../../../model/Model';
import {CborDecoderBase} from '@jsonjoy.com/json-pack/lib/cbor/CborDecoderBase';
import {CRDT_MAJOR} from '../../structural/binary/constants';
export class Decoder {
public readonly dec: CborDecoderBase<CrdtReader>;
protected doc!: Model;
protected clockTable?: ClockTable;
constructor(reader?: CrdtReader) {
this.dec = new CborDecoderBase<CrdtReader>(reader || new CrdtReader());
}
public decode<M extends Model>(
fields: IndexedFields,
ModelConstructor: new (clock: IClockVector) => M = Model as unknown as new (
clock: IClockVector,
) => M,
): M {
const reader = this.dec.reader;
reader.reset(fields.c);
const clockTable = (this.clockTable = ClockTable.decode(reader));
return this.decodeFields(clockTable, fields, ModelConstructor);
}
public decodeFields<M extends Model>(
clockTable: ClockTable,
fields: IndexedNodeFields,
ModelConstructor: new (clock: IClockVector) => M = Model as unknown as new (
clock: IClockVector,
) => M,
): M {
const reader = this.dec.reader;
const firstClock = clockTable.byIdx[0];
const vectorClock = new ClockVector(firstClock.sid, firstClock.time + 1);
const doc = (this.doc = new ModelConstructor(vectorClock));
const root = fields.r;
if (root && root.length) {
reader.reset(root);
const rootValue = this.ts();
doc.root.set(rootValue);
}
const index = doc.index;
const keys = Object.keys(fields);
const length = keys.length;
for (let i = 0; i < length; i++) {
const field = keys[i];
if (field.length < 3) continue; // Skip "c" and "r".
const arr = fields[field as FieldName];
const id = clockTable.parseField(field as FieldName);
reader.reset(arr);
const node = this.decodeNode(id);
index.set(id, node);
}
return doc;
}
protected ts(): ITimestampStruct {
const [sessionIndex, timeDiff] = this.dec.reader.id();
return new Timestamp(this.clockTable!.byIdx[sessionIndex].sid, timeDiff);
}
protected decodeNode(id: ITimestampStruct): nodes.JsonNode {
const reader = this.dec.reader;
const octet = reader.u8();
const major = octet >> 5;
const minor = octet & 0b11111;
const length = minor < 24 ? minor : minor === 24 ? reader.u8() : minor === 25 ? reader.u16() : reader.u32();
switch (major) {
case CRDT_MAJOR.CON:
return this.decodeCon(id, length);
case CRDT_MAJOR.VAL:
return this.decodeVal(id);
case CRDT_MAJOR.OBJ:
return this.decodeObj(id, length);
case CRDT_MAJOR.VEC:
return this.decodeVec(id, length);
case CRDT_MAJOR.STR:
return this.decodeStr(id, length);
case CRDT_MAJOR.BIN:
return this.decodeBin(id, length);
case CRDT_MAJOR.ARR:
return this.decodeArr(id, length);
}
return UNDEFINED;
}
public decodeCon(id: ITimestampStruct, length: number): nodes.ConNode {
const decoder = this.dec;
const data = !length ? decoder.val() : this.ts();
const node = new nodes.ConNode(id, data);
return node;
}
public decodeVal(id: ITimestampStruct): nodes.ValNode {
const val = this.ts();
const node = new nodes.ValNode(this.doc, id, val);
return node;
}
public decodeObj(id: ITimestampStruct, length: number): nodes.ObjNode {
const decoder = this.dec;
const obj = new nodes.ObjNode(this.doc, id);
const keys = obj.keys;
for (let i = 0; i < length; i++) {
const key = decoder.val() + '';
const val = this.ts();
keys.set(key, val);
}
return obj;
}
public decodeVec(id: ITimestampStruct, length: number): nodes.VecNode {
const reader = this.dec.reader;
const node = new nodes.VecNode(this.doc, id);
const elements = node.elements;
for (let i = 0; i < length; i++) {
const octet = reader.u8();
Iif (!octet) elements.push(undefined);
else elements.push(this.ts());
}
return node;
}
protected decodeStr(id: ITimestampStruct, length: number): nodes.StrNode {
const node = new nodes.StrNode(id);
node.ingest(length, this.decodeStrChunk);
return node;
}
private decodeStrChunk = (): nodes.StrChunk => {
const decoder = this.dec;
const reader = decoder.reader;
const id = this.ts();
const val = decoder.val();
if (typeof val === 'string') return new nodes.StrChunk(id, val.length, val);
return new nodes.StrChunk(id, ~~(<number>val), '');
};
protected decodeBin(id: ITimestampStruct, length: number): nodes.BinNode {
const node = new nodes.BinNode(id);
node.ingest(length, this.decodeBinChunk);
return node;
}
private decodeBinChunk = (): nodes.BinChunk => {
const id = this.ts();
const reader = this.dec.reader;
const [deleted, length] = reader.b1vu56();
if (deleted) return new nodes.BinChunk(id, length, undefined);
return new nodes.BinChunk(id, length, reader.buf(length));
};
protected decodeArr(id: ITimestampStruct, length: number): nodes.ArrNode {
const node = new nodes.ArrNode(this.doc, id);
node.ingest(length, this.decodeArrChunk);
return node;
}
private decodeArrChunk = (): nodes.ArrChunk => {
const id = this.ts();
const reader = this.dec.reader;
const [deleted, length] = reader.b1vu56();
if (deleted) return new nodes.ArrChunk(id, length, undefined);
else {
const data: ITimestampStruct[] = [];
for (let i = 0; i < length; i++) data.push(this.ts());
return new nodes.ArrChunk(id, length, data);
}
};
}
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