json-joy
Version:
Collection of libraries for building collaborative editing apps.
129 lines (128 loc) • 4.97 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decode = void 0;
const constants_1 = require("../../constants");
const fromBase64_1 = require("@jsonjoy.com/base64/lib/fromBase64");
const clock_1 = require("../../clock");
const PatchBuilder_1 = require("../../PatchBuilder");
const constants_2 = require("../../constants");
const timestamp = (sid, x) => {
return Array.isArray(x) ? new clock_1.Timestamp(x[0], x[1]) : new clock_1.Timestamp(sid, x);
};
const timespan = (sid, span) => {
return span.length === 3 ? new clock_1.Timespan(span[0], span[1], span[2]) : new clock_1.Timespan(sid, span[0], span[1]);
};
/**
* Decodes a JSON CRDT Patch from a "compact" POJO into a {@link Patch} instance.
*
* @param data A JavaScript POJO array in the compact codec format.
* @returns A decoded patch.
*/
const decode = (data) => {
const header = data[0];
const x = header[0];
const clock = Array.isArray(x) ? new clock_1.ClockVector(x[0], x[1]) : new clock_1.ServerClockVector(constants_2.SESSION.SERVER, x);
const sid = clock.sid;
const time = clock.time;
const builder = new PatchBuilder_1.PatchBuilder(clock);
const length = data.length;
for (let i = 1; i < length; i++) {
const op = data[i];
switch (op[0]) {
case constants_1.JsonCrdtPatchOpcode.new_con: {
const [, value, isTimestamp] = op;
builder.const(isTimestamp ? timestamp(sid, value) : value);
break;
}
case constants_1.JsonCrdtPatchOpcode.new_val: {
builder.val();
break;
}
case constants_1.JsonCrdtPatchOpcode.new_obj: {
builder.obj();
break;
}
case constants_1.JsonCrdtPatchOpcode.new_vec: {
builder.vec();
break;
}
case constants_1.JsonCrdtPatchOpcode.new_str: {
builder.str();
break;
}
case constants_1.JsonCrdtPatchOpcode.new_bin: {
builder.bin();
break;
}
case constants_1.JsonCrdtPatchOpcode.new_arr: {
builder.arr();
break;
}
case constants_1.JsonCrdtPatchOpcode.ins_val: {
builder.setVal(timestamp(sid, op[1]), timestamp(sid, op[2]));
break;
}
case constants_1.JsonCrdtPatchOpcode.ins_obj: {
const obj = timestamp(sid, op[1]);
const tuples = [];
const value = op[2];
const length = value.length;
for (let j = 0; j < length; j++) {
const [key, x] = value[j];
tuples.push([key, timestamp(sid, x)]);
}
builder.insObj(obj, tuples);
break;
}
case constants_1.JsonCrdtPatchOpcode.ins_vec: {
const obj = timestamp(sid, op[1]);
const tuples = [];
const value = op[2];
const length = value.length;
for (let j = 0; j < length; j++) {
const [key, x] = value[j];
tuples.push([key, timestamp(sid, x)]);
}
builder.insVec(obj, tuples);
break;
}
case constants_1.JsonCrdtPatchOpcode.ins_str: {
builder.insStr(timestamp(sid, op[1]), timestamp(sid, op[2]), op[3]);
break;
}
case constants_1.JsonCrdtPatchOpcode.ins_bin: {
builder.insBin(timestamp(sid, op[1]), timestamp(sid, op[2]), (0, fromBase64_1.fromBase64)(op[3]));
break;
}
case constants_1.JsonCrdtPatchOpcode.ins_arr: {
const obj = timestamp(sid, op[1]);
const ref = timestamp(sid, op[2]);
const value = op[3];
const elements = [];
const length = value.length;
for (let j = 0; j < length; j++)
elements.push(timestamp(sid, value[j]));
builder.insArr(obj, ref, elements);
break;
}
case constants_1.JsonCrdtPatchOpcode.del: {
const obj = timestamp(sid, op[1]);
const spans = op[2];
const what = [];
const length = spans.length;
for (let i = 0; i < length; i++)
what.push(timespan(sid, spans[i]));
builder.del(obj, what);
break;
}
case constants_1.JsonCrdtPatchOpcode.nop: {
builder.nop(op[1] || 1);
break;
}
}
}
const patch = builder.patch;
patch.meta = header[1];
return patch;
};
exports.decode = decode;