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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | 178x 178x 178x 178x 178x 178x 178x 178x 178x 7882x 7882x 7882x 7882x 7882x 7882x 7882x 7882x 3x 7882x 7882x 7882x 7882x 7882x 32910x 57024x 57024x 57024x 57024x 30906x 26118x 26118x 11313x 11313x 5894x 5894x 3277x 2617x 2617x 5894x 5894x 5894x 32910x 32910x 32910x 2642x 2642x 2642x 4x 4x 2638x 2638x 2642x 696x 696x 3965x 3965x 2x 2x 3224x 3224x 736x 736x 2408x 2408x 1431x 1431x 1431x 1431x 1431x 4512x 4512x 4512x 4512x 4394x 118x 118x 4512x 4512x 10938x 10938x 10938x 4512x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 5729x 5729x 5729x 5729x 5729x 5729x 5729x 5729x 5729x 165x 165x 5729x 2213x 2213x 2213x 2213x 673x 1540x 1540x 2213x 2213x 2213x 2213x 1762x 1762x 1762x 1762x 1605x 157x 157x 1762x 1762x 4611x 1762x 3044x 3044x 3044x 3044x 2658x 386x 386x 3044x 11313x 3044x 545x 545x 545x 175x 370x 370x 545x | import * as operations from '../../operations';
import {JsonCrdtPatchOpcodeOverlay} from '../../constants';
import {CrdtWriter} from '../../util/binary/CrdtWriter';
import {type ITimespanStruct, type ITimestampStruct, Timestamp} from '../../clock';
import {CborEncoder} from '@jsonjoy.com/json-pack/lib/cbor/CborEncoder';
import type {JsonCrdtPatchOperation, Patch} from '../../Patch';
/**
* JSON CRDT Patch "binary" codec encoder.
*/
export class Encoder extends CborEncoder<CrdtWriter> {
private patchSid: number = 0;
/**
* Creates a new encoder instance.
*
* @param writer An optional custom implementation of CRDT writer.
*/
constructor(public readonly writer: CrdtWriter = new CrdtWriter()) {
super(writer);
}
/**
* Encodes a JSON CRDT Patch into a {@link Uint8Array} blob.
*
* @param patch A JSON CRDT Patch to encode.
* @returns A {@link Uint8Array} blob containing the encoded JSON CRDT Patch.
*/
public encode(patch: Patch): Uint8Array {
this.writer.reset();
const id = patch.getId()!;
const sid = (this.patchSid = id.sid);
const writer = this.writer;
writer.vu57(sid);
writer.vu57(id.time);
const meta = patch.meta;
if (meta === undefined) this.writeUndef();
else this.writeArr([meta]);
this.encodeOperations(patch);
return writer.flush();
}
protected encodeOperations(patch: Patch): void {
const ops = patch.ops;
const length = ops.length;
this.writer.vu57(length);
for (let i = 0; i < length; i++) this.encodeOperation(ops[i]);
}
protected encodeId(id: ITimestampStruct) {
const sessionId = id.sid;
const time = id.time;
const writer = this.writer;
if (sessionId === this.patchSid) {
writer.b1vu56(0, time);
} else {
writer.b1vu56(1, time);
writer.vu57(sessionId);
}
}
protected encodeTss(span: ITimespanStruct): void {
this.encodeId(span);
this.writer.vu57(span.span);
}
private writeInsStr(length: number, obj: ITimestampStruct, ref: ITimestampStruct, str: string): number {
const writer = this.writer;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_str + length);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_str);
writer.vu57(length);
}
this.encodeId(obj);
this.encodeId(ref);
return writer.utf8(str);
}
protected encodeOperation(op: JsonCrdtPatchOperation): void {
const writer = this.writer;
const constr = op.constructor;
switch (constr) {
case operations.NewConOp: {
const operation = <operations.NewConOp>op;
const val = operation.val;
if (val instanceof Timestamp) {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_con + 1);
this.encodeId(val);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_con);
this.writeAny(val);
}
break;
}
case operations.NewValOp: {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_val);
break;
}
case operations.NewObjOp: {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_obj);
break;
}
case operations.NewVecOp: {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_vec);
break;
}
case operations.NewStrOp: {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_str);
break;
}
case operations.NewBinOp: {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_bin);
break;
}
case operations.NewArrOp: {
writer.u8(JsonCrdtPatchOpcodeOverlay.new_arr);
break;
}
case operations.InsValOp: {
const operation = <operations.InsValOp>op;
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_val);
this.encodeId(operation.obj);
this.encodeId(operation.val);
break;
}
case operations.InsObjOp: {
const operation = <operations.InsObjOp>op;
const data = operation.data;
const length = data.length;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_obj + length);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_obj);
writer.vu57(length);
}
this.encodeId(operation.obj);
for (let i = 0; i < length; i++) {
const tuple = data[i];
this.writeStr(tuple[0]);
this.encodeId(tuple[1]);
}
break;
}
case operations.InsVecOp: {
const operation = <operations.InsVecOp>op;
const data = operation.data;
const length = data.length;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_vec + length);
} else E{
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_vec);
writer.vu57(length);
}
this.encodeId(operation.obj);
for (let i = 0; i < length; i++) {
const tuple = data[i];
writer.u8(tuple[0]);
this.encodeId(tuple[1]);
}
break;
}
case operations.InsStrOp: {
const operation = <operations.InsStrOp>op;
const obj = operation.obj;
const ref = operation.ref;
const str = operation.data;
const len1 = str.length;
writer.ensureCapacity(24 + len1 * 4);
const x = writer.x;
const len2 = this.writeInsStr(len1, obj, ref, str);
if (len1 !== len2) {
writer.x = x;
this.writeInsStr(len2, obj, ref, str);
}
break;
}
case operations.InsBinOp: {
const operation = <operations.InsBinOp>op;
const buf = operation.data;
const length = buf.length;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_bin + length);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_bin);
writer.vu57(length);
}
this.encodeId(operation.obj);
this.encodeId(operation.ref);
writer.buf(buf, length);
break;
}
case operations.InsArrOp: {
const operation = <operations.InsArrOp>op;
const elements = operation.data;
const length = elements.length;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_arr + length);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.ins_arr);
writer.vu57(length);
}
this.encodeId(operation.obj);
this.encodeId(operation.ref);
for (let i = 0; i < length; i++) this.encodeId(elements[i]);
break;
}
case operations.DelOp: {
const operation = <operations.DelOp>op;
const what = operation.what;
const length = what.length;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.del + length);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.del);
writer.vu57(length);
}
this.encodeId(operation.obj);
for (let i = 0; i < length; i++) this.encodeTss(what[i]);
break;
}
case operations.NopOp: {
const operation = <operations.NopOp>op;
const length = operation.len;
if (length <= 0b111) {
writer.u8(JsonCrdtPatchOpcodeOverlay.nop + length);
} else {
writer.u8(JsonCrdtPatchOpcodeOverlay.nop);
writer.vu57(length);
}
break;
}
default: {
throw new Error('UNKNOWN_OP');
}
}
}
}
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