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import {CRDT_CONSTANTS} from '../../constants';
import {printTree} from 'tree-dump/lib/printTree';
import {compare, type ITimestampStruct, printTs} from '../../../json-crdt-patch/clock';
import type {Model} from '../../model';
import type {JsonNode, JsonNodeView} from '..';
import type {Printable} from 'tree-dump/lib/types';
import type {ExtNode} from '../../extensions/ExtNode';
import type {VecNodeExtensionData} from '../../schema/types';
/**
* Represents a `vec` JSON CRDT node, which is a LWW array.
*
* Vector is, usually a fixed length, last-write-wins array. Each element
* in the array is a reference to another JSON CRDT node. The vector
* can be extended by adding new elements to the end of the array.
*
* @category CRDT Node
*/
export class VecNode<Value extends JsonNode[] = JsonNode[]> implements JsonNode<JsonNodeView<Value>>, Printable {
/**
* @ignore
*/
public readonly elements: (ITimestampStruct | undefined)[] = [];
constructor(
/**
* @ignore
*/
public readonly doc: Model<any>,
public readonly id: ITimestampStruct,
) {}
/**
* Retrieves the ID of an element at the given index.
*
* @param index Index of the element to get.
* @returns ID of the element at the given index, if any.
*/
public val(index: number): undefined | ITimestampStruct {
return this.elements[index] as ITimestampStruct | undefined;
}
/**
* Retrieves the JSON CRDT node at the given index.
*
* @param index Index of the element to get.
* @returns JSON CRDT node at the given index, if any.
*/
public get<Index extends number>(index: Index): undefined | Value[Index] {
const id = this.elements[index] as ITimestampStruct | undefined;
if (!id) return undefined;
return this.doc.index.get(id);
}
/**
* @ignore
*/
public put(index: number, id: ITimestampStruct): undefined | ITimestampStruct {
Iif (index > CRDT_CONSTANTS.MAX_TUPLE_LENGTH) throw new Error('OUT_OF_BOUNDS');
const currentId = this.val(index);
if (currentId && compare(currentId, id) >= 0) return;
if (index > this.elements.length) for (let i = this.elements.length; i < index; i++) this.elements.push(undefined);
if (index < this.elements.length) this.elements[index] = id;
else this.elements.push(id);
return currentId;
}
/**
* @ignore
*/
private __extNode: VecNodeExtensionData<Value> = <any>undefined;
/**
* @ignore
* @returns Returns the extension data node if this is an extension node,
* otherwise `undefined`. The node is cached after the first access.
*/
public ext(): VecNodeExtensionData<Value> {
if (this.__extNode) return this.__extNode;
const extensionId = this.getExtId();
const isExtension = extensionId >= 0;
if (!isExtension) return <any>undefined;
const extension = this.doc.ext.get(extensionId);
if (!extension) return <any>undefined;
this.__extNode = new extension.Node(this.get(1)!);
return this.__extNode;
}
/**
* @ignore
*/
public isExt(): boolean {
return !!this.ext();
}
/**
* @ignore
* @returns Returns extension ID if this is an extension node, otherwise -1.
*/
public getExtId(): number {
if (this.elements.length !== 2) return -1;
const type = this.get(0);
if (!(type instanceof ConNode)) return -1;
const buf = type.val;
const id = this.id;
if (!(buf instanceof Uint8Array) || buf.length !== 3 || buf[1] !== id.sid % 256 || buf[2] !== id.time % 256)
return -1;
return buf[0];
}
// ----------------------------------------------------------------- JsonNode
/**
* @ignore
*/
public child(): ExtNode<JsonNode> | undefined {
return this.ext();
}
/**
* @ignore
*/
public container(): JsonNode | undefined {
return this;
}
/**
* @ignore
*/
public children(callback: (node: JsonNode) => void) {
const elements = this.elements;
const length = elements.length;
const index = this.doc.index;
for (let i = 0; i < length; i++) {
const id = elements[i];
Iif (!id) continue;
const node = index.get(id);
if (node) callback(node);
}
}
/**
* @ignore
*/
private _view = [] as JsonNodeView<Value>;
/**
* @ignore
*/
public view(): JsonNodeView<Value> {
const extNode = this.ext();
if (extNode) return extNode.view() as any;
let useCache = true;
const _view = this._view;
const arr = [] as JsonNodeView<Value>;
const index = this.doc.index;
const elements = this.elements;
const length = elements.length;
for (let i = 0; i < length; i++) {
const id = elements[i];
const node = id ? index.get(id) : undefined;
const value = node ? node.view() : undefined;
if (_view[i] !== value) useCache = false;
arr.push(value);
}
return useCache ? _view : (this._view = arr);
}
/**
* @ignore
*/
public api: undefined | unknown = undefined;
public name(): string {
return 'vec';
}
// ---------------------------------------------------------------- Printable
public toString(tab: string = ''): string {
const extNode = this.ext();
const header = this.name() + ' ' + printTs(this.id) + (extNode ? ` { extension = ${this.getExtId()} }` : '');
Iif (extNode) {
return this.child()!.toString(tab, this.id);
}
const index = this.doc.index;
return (
header +
printTree(tab, [
...this.elements.map(
(id, i) => (tab: string) =>
`${i}: ${
!id ? 'nil' : index.get(id) ? index.get(id)!.toString(tab + ' ' + ' '.repeat(('' + i).length)) : 'nil'
}`,
),
...(extNode ? [(tab: string) => `${this.child()!.toString(tab)}`] : []),
])
);
}
}
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