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NewConOp,
NewObjOp,
NewValOp,
NewVecOp,
NewStrOp,
NewBinOp,
NewArrOp,
InsValOp,
InsObjOp,
InsVecOp,
InsStrOp,
InsBinOp,
InsArrOp,
DelOp,
NopOp,
} from './operations';
import {type IClock, type ITimestampStruct, type ITimespanStruct, ts, Timestamp} from './clock';
import {isUint8Array} from '@jsonjoy.com/util/lib/buffers/isUint8Array';
import {Patch} from './Patch';
import {ORIGIN} from './constants';
import {VectorDelayedValue} from './builder/Tuple';
import {Konst} from './builder/Konst';
import {NodeBuilder} from './builder/DelayedValueBuilder';
const maybeConst = (x: unknown): boolean => {
switch (typeof x) {
case 'number':
case 'boolean':
return true;
default:
return x === null;
}
};
/**
* Utility class that helps in Patch construction.
*
* @category Patch
*/
export class PatchBuilder {
/** The patch being constructed. */
public patch: Patch;
/**
* Creates a new PatchBuilder instance.
*
* @param clock Clock to use for generating timestamps.
*/
constructor(public clock: IClock) {
this.patch = new Patch();
}
/**
* Retrieve the sequence number of the next timestamp.
*
* @returns The next timestamp sequence number that will be used by the builder.
*/
public nextTime(): number {
return this.patch.nextTime() || this.clock.time;
}
/**
* Returns the current {@link Patch} instance and resets the builder.
*
* @returns A new {@link Patch} instance containing all operations created
* using this builder.
*/
public flush(): Patch {
const patch = this.patch;
this.patch = new Patch();
return patch;
}
// --------------------------------------------------------- Basic operations
/**
* Create a new "obj" LWW-Map object.
*
* @returns ID of the new operation.
*/
public obj(): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewObjOp(id));
return id;
}
/**
* Create a new "arr" RGA-Array object.
*
* @returns ID of the new operation.
*/
public arr(): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewArrOp(id));
return id;
}
/**
* Create a new "vec" LWW-Array vector.
*
* @returns ID of the new operation.
*/
public vec(): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewVecOp(id));
return id;
}
/**
* Create a new "str" RGA-String object.
*
* @returns ID of the new operation.
*/
public str(): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewStrOp(id));
return id;
}
/**
* Create a new "bin" RGA-Binary object.
*
* @returns ID of the new operation.
*/
public bin(): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewBinOp(id));
return id;
}
/**
* Create a new immutable constant JSON value. Can be anything, including
* nested arrays and objects.
*
* @param value JSON value
* @returns ID of the new operation.
*/
public const(value: unknown): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewConOp(id, value));
return id;
}
/**
* Create a new "val" LWW-Register object. Can be anything, including
* nested arrays and objects.
*
* @param val Reference to another object.
* @returns ID of the new operation.
* @todo Rename to `newVal`.
*/
public val(): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new NewValOp(id));
return id;
}
/**
* Set value of document's root LWW-Register.
*
* @returns ID of the new operation.
*/
public root(val: ITimestampStruct): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new InsValOp(id, ORIGIN, val));
return id;
}
/**
* Set fields of an "obj" object.
*
* @returns ID of the new operation.
*/
public insObj(obj: ITimestampStruct, data: [key: string, value: ITimestampStruct][]): ITimestampStruct {
this.pad();
Iif (!data.length) throw new Error('EMPTY_TUPLES');
const id = this.clock.tick(1);
const op = new InsObjOp(id, obj, data);
const span = op.span();
Iif (span > 1) this.clock.tick(span - 1);
this.patch.ops.push(op);
return id;
}
/**
* Set elements of a "vec" object.
*
* @returns ID of the new operation.
*/
public insVec(obj: ITimestampStruct, data: [index: number, value: ITimestampStruct][]): ITimestampStruct {
this.pad();
Iif (!data.length) throw new Error('EMPTY_TUPLES');
const id = this.clock.tick(1);
const op = new InsVecOp(id, obj, data);
const span = op.span();
Iif (span > 1) this.clock.tick(span - 1);
this.patch.ops.push(op);
return id;
}
/**
* Set value of a "val" object.
*
* @returns ID of the new operation.
* @todo Rename to "insVal".
*/
public setVal(obj: ITimestampStruct, val: ITimestampStruct): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
const op = new InsValOp(id, obj, val);
this.patch.ops.push(op);
return id;
}
/**
* Insert a substring into a "str" object.
*
* @returns ID of the new operation.
*/
public insStr(obj: ITimestampStruct, ref: ITimestampStruct, data: string): ITimestampStruct {
this.pad();
Iif (!data.length) throw new Error('EMPTY_STRING');
const id = this.clock.tick(1);
const op = new InsStrOp(id, obj, ref, data);
const span = op.span();
if (span > 1) this.clock.tick(span - 1);
this.patch.ops.push(op);
return id;
}
/**
* Insert binary data into a "bin" object.
*
* @returns ID of the new operation.
*/
public insBin(obj: ITimestampStruct, ref: ITimestampStruct, data: Uint8Array): ITimestampStruct {
this.pad();
Iif (!data.length) throw new Error('EMPTY_BINARY');
const id = this.clock.tick(1);
const op = new InsBinOp(id, obj, ref, data);
const span = op.span();
if (span > 1) this.clock.tick(span - 1);
this.patch.ops.push(op);
return id;
}
/**
* Insert elements into an "arr" object.
*
* @returns ID of the new operation.
*/
public insArr(arr: ITimestampStruct, ref: ITimestampStruct, data: ITimestampStruct[]): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
const op = new InsArrOp(id, arr, ref, data);
const span = op.span();
if (span > 1) this.clock.tick(span - 1);
this.patch.ops.push(op);
return id;
}
/**
* Delete a span of operations.
*
* @param obj Object in which to delete something.
* @param what List of time spans to delete.
* @returns ID of the new operation.
*/
public del(obj: ITimestampStruct, what: ITimespanStruct[]): ITimestampStruct {
this.pad();
const id = this.clock.tick(1);
this.patch.ops.push(new DelOp(id, obj, what));
return id;
}
/**
* Operation that does nothing just skips IDs in the patch.
*
* @param span Length of the operation.
* @returns ID of the new operation.
*
*/
public nop(span: number) {
this.pad();
const id = this.clock.tick(span);
this.patch.ops.push(new NopOp(id, span));
return id;
}
// --------------------------------------- JSON value construction operations
/**
* Run the necessary builder commands to create an arbitrary JSON object.
*/
public jsonObj(obj: object): ITimestampStruct {
const id = this.obj();
const keys = Object.keys(obj);
if (keys.length) {
const tuples: [key: string, value: ITimestampStruct][] = [];
for (const k of keys) {
const value = (obj as any)[k];
const valueId = value instanceof Timestamp ? value : maybeConst(value) ? this.const(value) : this.json(value);
tuples.push([k, valueId]);
}
this.insObj(id, tuples);
}
return id;
}
/**
* Run the necessary builder commands to create an arbitrary JSON array.
*/
public jsonArr(arr: unknown[]): ITimestampStruct {
const id = this.arr();
if (arr.length) {
const values: ITimestampStruct[] = [];
for (const el of arr) values.push(this.json(el));
this.insArr(id, id, values);
}
return id;
}
/**
* Run builder commands to create a JSON string.
*/
public jsonStr(str: string): ITimestampStruct {
const id = this.str();
if (str) this.insStr(id, id, str);
return id;
}
/**
* Run builder commands to create a binary data type.
*/
public jsonBin(bin: Uint8Array): ITimestampStruct {
const id = this.bin();
if (bin.length) this.insBin(id, id, bin);
return id;
}
/**
* Run builder commands to create a JSON value.
*/
public jsonVal(value: unknown): ITimestampStruct {
const valId = this.val();
const id = this.const(value);
this.setVal(valId, id);
return valId;
}
/**
* Run builder commands to create a tuple.
*/
public jsonVec(vector: unknown[]): ITimestampStruct {
const id = this.vec();
const length = vector.length;
if (length) {
const writes: [index: number, value: ITimestampStruct][] = [];
for (let i = 0; i < length; i++) writes.push([i, this.constOrJson(vector[i])]);
this.insVec(id, writes);
}
return id;
}
/**
* Run the necessary builder commands to create any arbitrary JSON value.
*/
public json(json: unknown): ITimestampStruct {
if (json instanceof Timestamp) return json;
if (json === undefined) return this.const(json);
if (json instanceof Array) return this.jsonArr(json);
if (isUint8Array(json)) return this.jsonBin(json);
if (json instanceof VectorDelayedValue) return this.jsonVec(json.slots);
if (json instanceof Konst) return this.const(json.val);
if (json instanceof NodeBuilder) return json.build(this);
switch (typeof json) {
case 'object':
return json === null ? this.jsonVal(json) : this.jsonObj(json!);
case 'string':
return this.jsonStr(json);
case 'number':
case 'boolean':
return this.jsonVal(json);
}
throw new Error('INVALID_JSON');
}
/**
* Given a JSON `value` creates the necessary builder commands to create
* JSON CRDT Patch operations to construct the value. If the `value` is a
* timestamp, it is returned as-is. If the `value` is a JSON primitive is
* a number, boolean, or `null`, it is converted to a "con" data type. Otherwise,
* the `value` is converted using the {@link PatchBuilder.json} method.
*
* @param value A JSON value for which to create JSON CRDT Patch construction operations.
* @returns ID of the root constructed CRDT object.
*/
public constOrJson(value: unknown): ITimestampStruct {
if (value instanceof Timestamp) return value;
return maybeConst(value) ? this.const(value) : this.json(value);
}
/**
* Creates a "con" data type unless the value is already a timestamp, in which
* case it is returned as-is.
*
* @param value Value to convert to a "con" data type.
* @returns ID of the new "con" object.
*/
public maybeConst(value: unknown | Timestamp): Timestamp {
return value instanceof Timestamp ? value : this.const(value);
}
// ------------------------------------------------------------------ Private
/**
* Add padding "noop" operation if clock's time has jumped. This method checks
* if clock has advanced past the ID of the last operation of the patch and,
* if so, adds a "noop" operation to the patch to pad the gap.
*/
public pad() {
const nextTime = this.patch.nextTime();
if (!nextTime) return;
const drift = this.clock.time - nextTime;
if (drift > 0) {
const id = ts(this.clock.sid, nextTime);
const padding = new NopOp(id, drift);
this.patch.ops.push(padding);
}
}
}
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