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import {ClockTable} from '../../../../json-crdt-patch/codec/clock/ClockTable';
import {CrdtWriter} from '../../../../json-crdt-patch/util/binary/CrdtWriter';
import {CborEncoder} from '@jsonjoy.com/json-pack/lib/cbor/CborEncoder';
import type {Model} from '../../../model';
import * as nodes from '../../../nodes';
import {CRDT_MAJOR_OVERLAY} from '../../structural/binary/constants';
import type {IndexedFields, FieldName} from './types';
export class Encoder {
public readonly enc: CborEncoder<CrdtWriter>;
protected clockTable?: ClockTable;
constructor(writer?: CrdtWriter) {
this.enc = new CborEncoder<CrdtWriter>(writer || new CrdtWriter());
}
public encode(doc: Model<any>, clockTable: ClockTable = ClockTable.from(doc.clock)): IndexedFields {
this.clockTable = clockTable;
const writer = this.enc.writer;
writer.reset();
clockTable.write(writer);
const encodedClock = writer.flush();
const rootValueId = doc.root.val;
const result: IndexedFields = {
c: encodedClock,
};
if (rootValueId.sid !== 0) {
writer.reset();
this.ts(rootValueId);
result.r = writer.flush();
}
// biome-ignore lint: index is not iterable
doc.index.forEach(({v: node}) => this.onNode(result, node));
return result;
}
protected readonly onNode = (result: IndexedFields, node: nodes.JsonNode) => {
const id = node.id;
const sid = id.sid;
const time = id.time;
const sidIndex = this.clockTable!.getBySid(sid).index;
const field = (sidIndex.toString(36) + '_' + time.toString(36)) as FieldName;
result[field] = this.encodeNode(node);
};
public encodeNode(node: nodes.JsonNode): Uint8Array {
if (node instanceof nodes.ConNode) return this.encodeCon(node);
else if (node instanceof nodes.ValNode) return this.encodeVal(node);
else if (node instanceof nodes.ObjNode) return this.encodeObj(node);
else if (node instanceof nodes.VecNode) return this.encodeVec(node);
else if (node instanceof nodes.StrNode) return this.encodeStr(node);
else if (node instanceof nodes.BinNode) return this.encodeBin(node);
else if (node instanceof nodes.ArrNode) return this.encodeArr(node);
throw new Error('UNKNOWN_NODE');
}
protected ts(id: ITimestampStruct): void {
const index = this.clockTable!.getBySid(id.sid).index;
this.enc.writer.id(index, id.time);
}
protected writeTL(majorOverlay: CRDT_MAJOR_OVERLAY, length: number): void {
const writer = this.enc.writer;
if (length < 24) writer.u8(majorOverlay + length);
else if (length <= 0xff) writer.u16(((majorOverlay + 24) << 8) + length);
else if (length <= 0xffff) writer.u8u16(majorOverlay + 25, length);
else Ewriter.u8u32(majorOverlay + 26, length);
}
public encodeCon(node: nodes.ConNode): Uint8Array {
const encoder = this.enc;
const writer = encoder.writer;
const val = node.val;
writer.reset();
if (val instanceof Timestamp) {
this.writeTL(CRDT_MAJOR_OVERLAY.CON, 1);
this.ts(val as Timestamp);
} else {
this.writeTL(CRDT_MAJOR_OVERLAY.CON, 0);
encoder.writeAny(val);
}
return writer.flush();
}
public encodeVal(node: nodes.ValNode): Uint8Array {
const writer = this.enc.writer;
const child = node.node();
writer.reset();
this.writeTL(CRDT_MAJOR_OVERLAY.VAL, 0);
this.ts(child.id);
return writer.flush();
}
public encodeObj(node: nodes.ObjNode): Uint8Array {
const encoder = this.enc;
const writer = encoder.writer;
writer.reset();
const keys = node.keys;
this.writeTL(CRDT_MAJOR_OVERLAY.OBJ, keys.size);
keys.forEach(this.onObjKey);
return writer.flush();
}
private readonly onObjKey = (value: ITimestampStruct, key: string) => {
this.enc.writeStr(key);
this.ts(value);
};
public encodeVec(node: nodes.VecNode): Uint8Array {
const writer = this.enc.writer;
writer.reset();
const length = node.elements.length;
this.writeTL(CRDT_MAJOR_OVERLAY.VEC, length);
for (let i = 0; i < length; i++) {
const childId = node.val(i);
Iif (!childId) writer.u8(0);
else {
writer.u8(1);
this.ts(childId);
}
}
return writer.flush();
}
public encodeStr(node: nodes.StrNode): Uint8Array {
const encoder = this.enc;
const writer = encoder.writer;
writer.reset();
this.writeTL(CRDT_MAJOR_OVERLAY.STR, node.count);
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
this.ts(chunk.id);
if (chunk.del) encoder.writeUInteger(chunk.span);
else encoder.writeStr(chunk.data!);
}
return writer.flush();
}
public encodeBin(node: nodes.BinNode): Uint8Array {
const encoder = this.enc;
const writer = encoder.writer;
writer.reset();
this.writeTL(CRDT_MAJOR_OVERLAY.BIN, node.count);
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
const length = chunk.span;
const deleted = chunk.del;
this.ts(chunk.id);
writer.b1vu56(~~deleted as 0 | 1, length);
if (deleted) continue;
writer.buf(chunk.data!, length);
}
return writer.flush();
}
public encodeArr(node: nodes.ArrNode): Uint8Array {
const encoder = this.enc;
const writer = encoder.writer;
writer.reset();
this.writeTL(CRDT_MAJOR_OVERLAY.ARR, node.count);
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
const length = chunk.span;
const deleted = chunk.del;
this.ts(chunk.id);
writer.b1vu56(~~deleted as 0 | 1, length);
if (deleted) continue;
const data = chunk.data;
for (let i = 0; i < length; i++) this.ts(data![i]);
}
return writer.flush();
}
}
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