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110195x 110195x 19x 19x 19x 19x 19x 17x 17x 19x 19x 19x 17x 17x 17x 17x 59x 17x 170x 15x 15x 15x 15x 15x 8x 8x 8x 8x 8x 8x 3x 170x 53x 53x 53x 53x 53x 72x 53x 53x 4x 4x 3x 3x 3x 3x 3x 3x 26x 26x 26x 26x 26x 36x 11x 11x 8x 8x 8x 8x 8x 11x 170x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 14393x 47137x 47074x 25601x 25562x 22512x 18446x 18400x 3988x 3987x 2089x 2089x 1x 13730x 13730x 50548x 50548x 50548x 50548x 50548x 471769x 50547x 50547x 50547x 539204x 539204x 539204x 539204x 14393x 98x 97x 97x 97x 97x 85x 97x 13357x 13357x 13357x 13357x 14393x 14393x 14393x | import {printTree} from 'tree-dump/lib/printTree';
import {get} from '@jsonjoy.com/json-pointer/lib/get';
import {toPath} from '@jsonjoy.com/json-pointer/lib/util';
import {find} from './find';
import {type ITimestampStruct, Timestamp} from '../../../json-crdt-patch/clock';
import {ObjNode, ArrNode, BinNode, ConNode, VecNode, ValNode, StrNode, RootNode} from '../../nodes';
import {NodeEvents} from './NodeEvents';
import {FanOut} from 'thingies/lib/fanout';
import {PatchBuilder} from '../../../json-crdt-patch/PatchBuilder';
import {MergeFanOut, MicrotaskBufferFanOut} from './fanout';
import {ExtNode} from '../../extensions/ExtNode';
import * as diff from '../../../json-crdt-diff';
import type {Path} from '@jsonjoy.com/json-pointer';
import type {Extension} from '../../extensions/Extension';
import type {ExtApi} from '../../extensions/types';
import type * as types from './proxy';
import type {Printable} from 'tree-dump/lib/types';
import type {JsonNodeApi} from './types';
import type {VecNodeExtensionData} from '../../schema/types';
import type {Patch} from '../../../json-crdt-patch';
import {type JsonNodeToProxyPathNode, proxy$} from './proxy';
import type {SyncStore} from '../../../util/events/sync-store';
import type {Model} from '../Model';
import type {JsonNode, JsonNodeView} from '../../nodes';
const breakPath = (path: ApiPath): [parent: Path | undefined, key: string | number] => {
Iif (!path) return [void 0, ''];
Iif (typeof path === 'number') return [void 0, path];
if (typeof path === 'string') path = toPath(path);
switch (path.length) {
case 0:
return [void 0, ''];
case 1:
return [void 0, path[0]];
default: {
const key = path[path.length - 1];
const parent = path.slice(0, -1);
return [parent, key];
}
}
};
export type ApiPath = string | number | Path | undefined;
/**
* A generic local changes API for a JSON CRDT node.
*
* @category Local API
*/
export class NodeApi<N extends JsonNode = JsonNode> implements Printable {
constructor(
public node: N,
public readonly api: ModelApi<any>,
) {}
/** @ignore */
private ev: undefined | NodeEvents<N> = undefined;
/**
* Event target for listening to node changes. You can subscribe to `"view"`
* events, which are triggered every time the node's view changes.
*
* ```ts
* node.events.on('view', () => {
* // do something...
* });
* ```
*/
public get events(): NodeEvents<N> {
const et = this.ev;
return et || (this.ev = new NodeEvents<N>(this));
}
/**
* Find a child node at the given path starting from this node.
*
* @param path Path to the child node to find.
* @returns JSON CRDT node at the given path.
*/
public find(path?: ApiPath): JsonNode {
let node: JsonNode<any> = this.node;
/**
* @todo Remove this .child() loop, and remove the `.child()` method from JsonNode interface.
*/
if (path === undefined) {
if (typeof node.child === 'function') {
const child = node.child();
Iif (!child) {
Iif (node instanceof RootNode) return node;
throw new Error('NO_CHILD');
}
return child;
}
throw new Error('CANNOT_IN');
}
if (typeof path === 'string' && !!path && path[0] !== '/') path = '/' + path;
if (typeof path === 'number') path = [path];
while (node instanceof ValNode) node = node.child()!;
return find(node, path);
}
/**
* Find a child node at the given path starting from this node and wrap it in
* a local changes API.
*
* @param path Path to the child node to find.
* @returns Local changes API for the child node at the given path.
*/
public in(path?: ApiPath) {
const node = this.find(path);
return this.api.wrap(node as any);
}
public asVal(): ValApi {
if (this.node instanceof ValNode) return this.api.wrap(this.node as ValNode);
throw new Error('NOT_VAL');
}
public asStr(): StrApi {
if (this.node instanceof StrNode) return this.api.wrap(this.node);
throw new Error('NOT_STR');
}
public asBin(): BinApi {
if (this.node instanceof BinNode) return this.api.wrap(this.node);
throw new Error('NOT_BIN');
}
public asArr(): ArrApi {
if (this.node instanceof ArrNode) return this.api.wrap(this.node);
throw new Error('NOT_ARR');
}
public asVec(): VecApi {
if (this.node instanceof VecNode) return this.api.wrap(this.node as VecNode);
throw new Error('NOT_VEC');
}
public asObj(): ObjApi {
if (this.node instanceof ObjNode) return this.api.wrap(this.node as ObjNode);
throw new Error('NOT_OBJ');
}
public asCon(): ConApi {
if (this.node instanceof ConNode) return this.api.wrap(this.node);
throw new Error('NOT_CON');
}
/**
* Returns the API object of the extension if the node is an extension node.
* When the `ext` parameter is provided, it checks if the node is an instance
* of the given extension and returns the object's TypeScript type. Otherwise,
* it returns the API object of the extension, but without any type checking.
*
* @param ext Extension of the node
* @returns API of the extension
*/
public asExt(): JsonNodeApi<VecNodeExtensionData<N>> | ExtApi<any> | undefined;
public asExt<EN extends ExtNode<any, any>, EApi extends ExtApi<EN>>(
ext: Extension<any, any, EN, EApi, any, any>,
): EApi;
public asExt<EN extends ExtNode<any, any>, EApi extends ExtApi<EN>>(
ext?: Extension<any, any, EN, EApi, any, any>,
): EApi {
let extNode: ExtNode<any> | undefined = undefined;
const node: JsonNode | undefined = this.node;
Iif (node instanceof ExtNode) extNode = node;
if (node instanceof VecNode) extNode = node.ext();
Iif (!extNode) throw new Error('NOT_EXT');
const api = this.api.wrap(extNode);
if (!ext) return api as any;
if (api instanceof ext.Api) return api;
throw new Error('NOT_EXT');
}
public val(path?: ApiPath): ValApi {
return this.in(path).asVal();
}
public str(path?: ApiPath): StrApi {
return this.in(path).asStr();
}
public bin(path?: ApiPath): BinApi {
return this.in(path).asBin();
}
public arr(path?: ApiPath): ArrApi {
return this.in(path).asArr();
}
public vec(path?: ApiPath): VecApi {
return this.in(path).asVec();
}
public obj(path?: ApiPath): ObjApi {
return this.in(path).asObj();
}
public con(path?: ApiPath): ConApi {
return this.in(path).asCon();
}
public view(): JsonNodeView<N> {
return this.node.view() as unknown as JsonNodeView<N>;
}
public select(path?: ApiPath, leaf?: boolean) {
try {
let node = path ? this.find(path) : this.node;
if (leaf) while (node instanceof ValNode) node = node.child();
return this.api.wrap(node);
} catch (e) {
return;
}
}
public read(path?: ApiPath): unknown {
const view = this.view();
if (Array.isArray(path)) return get(view, path);
if (!path) return view;
let path2: string = path + '';
Iif (path && path2[0] !== '/') path2 = '/' + path2;
return get(view, toPath(path2));
}
public add(path: ApiPath, value: unknown): boolean {
const [parent, key] = breakPath(path);
ADD: try {
const node = this.select(parent, true);
if (node instanceof ObjApi) {
node.set({[key]: value});
} else if (node instanceof ArrApi || node instanceof StrApi || node instanceof BinApi) {
const length = node.length();
let index: number = 0;
Iif (typeof key === 'number') index = key;
else if (key === '-') index = length;
else {
index = ~~key;
if (index + '' !== key) break ADD;
}
Iif (index !== index) break ADD;
Iif (index < 0) index = 0;
if (index > length) index = length;
if (node instanceof ArrApi) {
node.ins(index, Array.isArray(value) ? value : [value]);
} else if (node instanceof StrApi) {
node.ins(index, value + '');
} else if (node instanceof BinApi) {
Iif (!(value instanceof Uint8Array)) break ADD;
node.ins(index, value);
}
} else if (node instanceof VecApi) {
node.set([[~~key, value]]);
} else break ADD;
return true;
} catch {}
return false;
}
public replace(path: ApiPath, value: unknown): boolean {
const [parent, key] = breakPath(path);
REPLACE: try {
const node = this.select(parent, true);
if (node instanceof ObjApi) {
const keyStr = key + '';
if (!node.has(keyStr)) break REPLACE;
node.set({[key]: value});
} else if (node instanceof ArrApi) {
const length = node.length();
let index: number = 0;
Iif (typeof key === 'number') index = key;
else {
index = ~~key;
Iif (index + '' !== key) break REPLACE;
}
Iif (index !== index || index < 0 || index > length - 1) break REPLACE;
const element = node.node.getNode(index);
if (element instanceof ValNode) {
this.api.wrap(element).set(value);
} else {
node.ins(index, [value]);
node.del(index + 1, 1);
}
} else Eif (node instanceof VecApi) {
node.set([[~~key, value]]);
} else break REPLACE;
return true;
} catch {}
return false;
}
public remove(path: ApiPath, length: number = 1): boolean {
const [parent, key] = breakPath(path);
REMOVE: try {
const node = this.select(parent, true);
if (node instanceof ObjApi) {
const keyStr = key + '';
if (!node.has(keyStr)) break REMOVE;
node.del([keyStr]);
} else if (node instanceof ArrApi || node instanceof StrApi || node instanceof BinApi) {
const len = node.length();
let index: number = 0;
if (typeof key === 'number') index = key;
else Iif (key === '-') index = length;
else {
index = ~~key;
Iif (index + '' !== key) break REMOVE;
}
if (index !== index || index < 0 || index > len) break REMOVE;
node.del(index, Math.min(length, len - index));
} else if (node instanceof VecApi) {
node.set([[~~key, void 0]]);
} else Ebreak REMOVE;
return true;
} catch {}
return false;
}
public diff(value: unknown): Patch {
return diff.diff(this, value);
}
public merge(value: unknown): void {
diff.merge(this, value);
}
public get s(): types.ProxyNode<N> {
return {$: this} as unknown as types.ProxyNode<N>;
}
public get $(): JsonNodeToProxyPathNode<N> {
return proxy$((path) => {
try {
return this.api.wrap(this.find(path));
} catch {
return;
}
}, '$') as any;
}
public toString(tab: string = ''): string {
return 'api' + printTree(tab, [(tab) => this.node.toString(tab)]);
}
}
/**
* Represents the local changes API for the `con` JSON CRDT node {@link ConNode}.
*
* @category Local API
*/
export class ConApi<N extends ConNode<any> = ConNode<any>> extends NodeApi<N> {
/**
* Returns a proxy object for this node.
*/
public get s(): types.ProxyNodeCon<N> {
return {$: this} as unknown as types.ProxyNodeCon<N>;
}
}
/**
* Local changes API for the `val` JSON CRDT node {@link ValNode}.
*
* @category Local API
*/
export class ValApi<N extends ValNode<any> = ValNode<any>> extends NodeApi<N> {
/**
* Get API instance of the inner node.
* @returns Inner node API.
*/
public get(): JsonNodeApi<N extends ValNode<infer T> ? T : JsonNode> {
return this.in() as any;
}
/**
* Sets the value of the node.
*
* @param json JSON/CBOR value or ID (logical timestamp) of the value to set.
* @returns Reference to itself.
*/
public set(json: JsonNodeView<N>): void {
const {api, node} = this;
const builder = api.builder;
const val = builder.constOrJson(json);
api.builder.setVal(node.id, val);
api.apply();
}
/**
* Returns a proxy object for this node. Allows to access the value of the
* node by accessing the `.val` property.
*/
public get s(): types.ProxyNodeVal<N> {
const self = this;
const proxy = {
$: this,
get _() {
const childNode = self.node.node();
return (<any>self).api.wrap(childNode).s;
},
};
return <any>proxy;
}
}
type UnVecNode<N> = N extends VecNode<infer T> ? T : never;
/**
* Local changes API for the `vec` JSON CRDT node {@link VecNode}.
*
* @category Local API
*/
export class VecApi<N extends VecNode<any> = VecNode<any>> extends NodeApi<N> {
/**
* Get API instance of a child node.
*
* @param key Object key to get.
* @returns A specified child node API.
*/
public get<K extends keyof UnVecNode<N>>(key: K): JsonNodeApi<UnVecNode<N>[K]> {
return this.in(key as string) as any;
}
/**
* Sets a list of elements to the given values.
*
* @param entries List of index-value pairs to set.
* @returns Reference to itself.
*/
public set(entries: [index: number, value: unknown][]): void {
const {api, node} = this;
const {builder} = api;
builder.insVec(
node.id,
entries.map(([index, json]) => [index, builder.constOrJson(json)]),
);
api.apply();
}
public push(...values: unknown[]): void {
const length = this.length();
this.set(values.map((value, index) => [length + index, value]));
}
/**
* Get the length of the vector without materializing it to a view.
*
* @returns Length of the vector.
*/
public length(): number {
return this.node.elements.length;
}
/**
* Returns a proxy object for this node. Allows to access vector elements by
* index.
*/
public get s(): types.ProxyNodeVec<N> {
const proxy = new Proxy(
{},
{
get: (target, prop, receiver) => {
if (prop === '$') return this;
if (prop === 'toExt') return () => this.asExt();
const index = Number(prop);
Iif (Number.isNaN(index)) throw new Error('INVALID_INDEX');
const child = this.node.get(index);
Iif (!child) throw new Error('OUT_OF_BOUNDS');
return (<any>this).api.wrap(child).s;
},
},
);
return proxy as types.ProxyNodeVec<N>;
}
}
type UnObjNode<N> = N extends ObjNode<infer T> ? T : never;
/**
* Local changes API for the `obj` JSON CRDT node {@link ObjNode}.
*
* @category Local API
*/
export class ObjApi<N extends ObjNode<any> = ObjNode<any>> extends NodeApi<N> {
/**
* Get API instance of a child node.
*
* @param key Object key to get.
* @returns A specified child node API.
*/
public get<K extends keyof UnObjNode<N>>(key: K): JsonNodeApi<UnObjNode<N>[K]> {
return this.in(key as string) as any;
}
/**
* Sets a list of keys to the given values.
*
* @param entries List of key-value pairs to set.
* @returns Reference to itself.
*/
public set(entries: Partial<JsonNodeView<N>>): void {
const {api, node} = this;
const {builder} = api;
builder.insObj(
node.id,
Object.entries(entries).map(([key, json]) => [key, builder.constOrJson(json)]),
);
api.apply();
}
/**
* Deletes a list of keys from the object.
*
* @param keys List of keys to delete.
* @returns Reference to itself.
*/
public del(keys: string[]): void {
const {api, node} = this;
const {builder} = api;
api.builder.insObj(
node.id,
keys.map((key) => [key, builder.con(undefined)]),
);
api.apply();
}
/**
* Checks if a key exists in the object.
*
* @param key Key to check.
* @returns True if the key exists, false otherwise.
*/
public has(key: string): boolean {
return this.node.keys.has(key);
}
/**
* Returns a proxy object for this node. Allows to access object properties
* by key.
*/
public get s(): types.ProxyNodeObj<N> {
const proxy = new Proxy(
{},
{
get: (target, prop, receiver) => {
if (prop === '$') return this;
const key = String(prop);
const child = this.node.get(key);
Iif (!child) throw new Error('NO_SUCH_KEY');
return (<any>this).api.wrap(child).s;
},
},
);
return proxy as types.ProxyNodeObj<N>;
}
}
/**
* Local changes API for the `str` JSON CRDT node {@link StrNode}. This API
* allows to insert and delete bytes in the UTF-16 string by referencing its
* local character positions.
*
* @category Local API
*/
export class StrApi extends NodeApi<StrNode> {
/**
* Inserts text at a given position.
*
* @param index Position at which to insert text.
* @param text Text to insert.
* @returns Reference to itself.
*/
public ins(index: number, text: string): void {
const {api, node} = this;
api.onBeforeLocalChange.emit(api.next);
const builder = api.builder;
builder.pad();
const nextTime = api.builder.nextTime();
const id = new Timestamp(builder.clock.sid, nextTime);
const after = node.insAt(index, id, text);
Iif (!after) throw new Error('OUT_OF_BOUNDS');
builder.insStr(node.id, after, text);
api.advance();
}
/**
* Deletes a range of text at a given position.
*
* @param index Position at which to delete text.
* @param length Number of UTF-16 code units to delete.
* @returns Reference to itself.
*/
public del(index: number, length: number): void {
const {api, node} = this;
api.onBeforeLocalChange.emit(api.next);
const builder = api.builder;
builder.pad();
const spans = node.findInterval(index, length);
Iif (!spans) throw new Error('OUT_OF_BOUNDS');
node.delete(spans);
builder.del(node.id, spans);
api.advance();
}
/**
* Given a character index in local coordinates, find the ID of the character
* in the global coordinates.
*
* @param index Index of the character or `-1` for before the first character.
* @returns ID of the character after which the given position is located.
*/
public findId(index: number | -1): ITimestampStruct {
const node = this.node;
const length = node.length();
const max = length - 1;
Iif (index > max) index = max;
if (index < 0) return node.id;
const id = node.find(index);
return id || node.id;
}
/**
* Given a position in global coordinates, find the position in local
* coordinates.
*
* @param id ID of the character.
* @returns Index of the character in local coordinates. Returns -1 if the
* the position refers to the beginning of the string.
*/
public findPos(id: ITimestampStruct): number | -1 {
const node = this.node;
const nodeId = node.id;
if (nodeId.sid === id.sid && nodeId.time === id.time) return -1;
const chunk = node.findById(id);
Iif (!chunk) return -1;
const pos = node.pos(chunk);
return pos + (chunk.del ? 0 : id.time - chunk.id.time);
}
/**
* Get the length of the string without materializing it to a view.
*
* @returns Length of the string.
*/
public length(): number {
return this.node.length();
}
/**
* Returns a proxy object for this node.
*/
public get s(): types.ProxyNodeStr {
return {$: this};
}
}
/**
* Local changes API for the `bin` JSON CRDT node {@link BinNode}. This API
* allows to insert and delete bytes in the binary string by referencing their
* local index.
*
* @category Local API
*/
export class BinApi extends NodeApi<BinNode> {
/**
* Inserts octets at a given position.
*
* @param index Position at which to insert octets.
* @param data Octets to insert.
* @returns Reference to itself.
*/
public ins(index: number, data: Uint8Array): void {
const {api, node} = this;
const after = !index ? node.id : node.find(index - 1);
Iif (!after) throw new Error('OUT_OF_BOUNDS');
api.builder.insBin(node.id, after, data);
api.apply();
}
/**
* Deletes a range of octets at a given position.
*
* @param index Position at which to delete octets.
* @param length Number of octets to delete.
* @returns Reference to itself.
*/
public del(index: number, length: number): void {
const {api, node} = this;
const spans = node.findInterval(index, length);
Iif (!spans) throw new Error('OUT_OF_BOUNDS');
api.builder.del(node.id, spans);
api.apply();
}
/**
* Get the length of the binary blob without materializing it to a view.
*
* @returns Length of the binary blob.
*/
public length(): number {
return this.node.length();
}
/**
* Returns a proxy object for this node.
*/
public get s(): types.ProxyNodeBin {
return {$: this};
}
}
type UnArrNode<N> = N extends ArrNode<infer T> ? T : never;
/**
* Local changes API for the `arr` JSON CRDT node {@link ArrNode}. This API
* allows to insert and delete elements in the array by referencing their local
* index.
*
* @category Local API
*/
export class ArrApi<N extends ArrNode<any> = ArrNode<any>> extends NodeApi<N> {
/**
* Get API instance of a child node.
*
* @param index Index of the element to get.
* @returns Child node API for the element at the given index.
*/
public get(index: number): JsonNodeApi<UnArrNode<N>> {
return this.in(index) as any;
}
/**
* Inserts elements at a given position.
*
* @param index Position at which to insert elements.
* @param values Values or schema of the elements to insert.
*/
public ins(index: number, values: Array<JsonNodeView<N>[number]>): void {
const {api, node} = this;
const {builder} = api;
const after = !index ? node.id : node.find(index - 1);
Iif (!after) throw new Error('OUT_OF_BOUNDS');
const valueIds: ITimestampStruct[] = [];
for (let i = 0; i < values.length; i++) valueIds.push(builder.json(values[i]));
builder.insArr(node.id, after, valueIds);
api.apply();
}
/**
* Inserts elements at the end of the array.
*
* @param values Values or schema of the elements to insert at the end of the array.
*/
public push(...values: JsonNodeView<N>[number][]): void {
const length = this.length();
this.ins(length, values);
}
/**
* Updates (overwrites) an element at a given position.
*
* @param index Position at which to update the element.
* @param value Value or schema of the element to replace with.
*/
public upd(index: number, value: JsonNodeView<N>[number]): void {
const {api, node} = this;
const ref = node.getId(index);
Iif (!ref) throw new Error('OUT_OF_BOUNDS');
const {builder} = api;
builder.updArr(node.id, ref, builder.constOrJson(value));
api.apply();
}
/**
* Deletes a range of elements at a given position.
*
* @param index Position at which to delete elements.
* @param length Number of elements to delete.
* @returns Reference to itself.
*/
public del(index: number, length: number): void {
const {api, node} = this;
const spans = node.findInterval(index, length);
Iif (!spans) throw new Error('OUT_OF_BOUNDS');
api.builder.del(node.id, spans);
api.apply();
}
/**
* Get the length of the array without materializing it to a view.
*
* @returns Length of the array.
*/
public length(): number {
return this.node.length();
}
/**
* Returns a proxy object that allows to access array elements by index.
*
* @returns Proxy object that allows to access array elements by index.
*/
public get s(): types.ProxyNodeArr<N> {
const proxy = new Proxy(
{},
{
get: (target, prop, receiver) => {
if (prop === '$') return this;
const index = Number(prop);
Iif (Number.isNaN(index)) throw new Error('INVALID_INDEX');
const child = this.node.getNode(index);
Iif (!child) throw new Error('OUT_OF_BOUNDS');
return (this.api.wrap(child) as any).s;
},
},
);
return proxy as types.ProxyNodeArr<N>;
}
}
/**
* Local changes API for a JSON CRDT model. This class is the main entry point
* for executing local user actions on a JSON CRDT document.
*
* @category Local API
*/
export class ModelApi<N extends JsonNode = JsonNode> extends ValApi<RootNode<N>> implements SyncStore<JsonNodeView<N>> {
/**
* Patch builder for the local changes.
*/
public builder: PatchBuilder;
/**
* Index of the next operation in builder's patch to be committed locally.
*
* @ignore
*/
public next: number = 0;
/** Emitted before the model is reset, using the `.reset()` method. */
public readonly onBeforeReset = new FanOut<void>();
/** Emitted after the model is reset, using the `.reset()` method. */
public readonly onReset = new FanOut<void>();
/** Emitted before a patch is applied using `model.applyPatch()`. */
public readonly onBeforePatch = new FanOut<Patch>();
/** Emitted after a patch is applied using `model.applyPatch()`. */
public readonly onPatch = new FanOut<Patch>();
/** Emitted before local changes through `model.api` are applied. */
public readonly onBeforeLocalChange = new FanOut<number>();
/** Emitted after local changes through `model.api` are applied. */
public readonly onLocalChange = new FanOut<number>();
/**
* Emitted after local changes through `model.api` are applied. Same as
* `.onLocalChange`, but this event buffered withing a microtask.
*/
public readonly onLocalChanges = new MicrotaskBufferFanOut<number>(this.onLocalChange);
/** Emitted before a transaction is started. */
public readonly onBeforeTransaction = new FanOut<void>();
/** Emitted after transaction completes. */
public readonly onTransaction = new FanOut<void>();
/** Emitted when the model changes. Combines `onReset`, `onPatch` and `onLocalChange`. */
public readonly onChange = new MergeFanOut<number | Patch | undefined>([
this.onReset,
this.onPatch,
this.onLocalChange,
]);
/** Emitted when the model changes. Same as `.onChange`, but this event is emitted once per microtask. */
public readonly onChanges = new MicrotaskBufferFanOut<number | Patch | undefined>(this.onChange);
/** Emitted when the `model.api` builder change buffer is flushed. */
public readonly onFlush = new FanOut<Patch>();
/**
* @param model Model instance on which the API operates.
*/
constructor(public readonly model: Model<N>) {
super(model.root, void 0 as any);
(this as any).api = this;
this.builder = new PatchBuilder(model.clock);
model.onbeforereset = () => this.onBeforeReset.emit();
model.onreset = () => this.onReset.emit();
model.onbeforepatch = (patch) => this.onBeforePatch.emit(patch);
model.onpatch = (patch) => this.onPatch.emit(patch);
}
/**
* Returns a local change API for the given node. If an instance already
* exists, returns the existing instance.
*/
public wrap(node: ValNode): ValApi;
public wrap(node: StrNode<any>): StrApi;
public wrap(node: BinNode): BinApi;
public wrap(node: ArrNode): ArrApi;
public wrap(node: ObjNode): ObjApi;
public wrap(node: ConNode): ConApi;
public wrap(node: VecNode): VecApi;
public wrap(node: JsonNode): NodeApi;
public wrap(node: ExtNode<any, any>): NodeApi;
public wrap(node: JsonNode) {
if (node instanceof ValNode) return node.api || (node.api = new ValApi(node, this));
else if (node instanceof StrNode) return node.api || (node.api = new StrApi(node, this));
else if (node instanceof BinNode) return node.api || (node.api = new BinApi(node, this));
else if (node instanceof ArrNode) return node.api || (node.api = new ArrApi(node, this));
else if (node instanceof ObjNode) return node.api || (node.api = new ObjApi(node, this));
else if (node instanceof ConNode) return node.api || (node.api = new ConApi(node, this));
else if (node instanceof VecNode) return node.api || (node.api = new VecApi(node, this));
else if (node instanceof ExtNode) {
if (node.api) return node.api;
const extension = this.model.ext.get(node.extId)!;
return (node.api = new extension.Api(node, this));
} else throw new Error('UNKNOWN_NODE');
}
/**
* Given a JSON/CBOR value, constructs CRDT nodes recursively out of it and
* sets the root node of the model to the constructed nodes.
*
* @param json JSON/CBOR value to set as the view of the model.
* @returns Reference to itself.
*
* @deprecated Use `.set()` instead.
*/
public root(json: unknown): this {
return this.set(json as any);
}
public set(json: unknown): this {
super.set(json as any);
return this;
}
/**
* Apply locally any operations from the `.builder`, which haven't been
* applied yet.
*/
public apply() {
const ops = this.builder.patch.ops;
const length = ops.length;
const model = this.model;
const from = this.next;
this.onBeforeLocalChange.emit(from);
for (let i = this.next; i < length; i++) model.applyOperation(ops[i]);
this.next = length;
model.tick++;
this.onLocalChange.emit(from);
}
/**
* Advance patch pointer to the end without applying the operations. With the
* idea that they have already been applied locally.
*
* You need to manually call `this.onBeforeLocalChange.emit(this.next)` before
* calling this method.
*
* @ignore
*/
public advance() {
const from = this.next;
this.next = this.builder.patch.ops.length;
this.model.tick++;
this.onLocalChange.emit(from);
}
private inTx = false;
public transaction(callback: () => void) {
if (this.inTx) callback();
else {
this.inTx = true;
try {
this.onBeforeTransaction.emit();
callback();
this.onTransaction.emit();
} finally {
this.inTx = false;
}
}
}
/**
* Flushes the builder and returns a patch.
*
* @returns A JSON CRDT patch.
* @todo Make this return undefined if there are no operations in the builder.
*/
public flush(): Patch {
const patch = this.builder.flush();
this.next = 0;
if (patch.ops.length) this.onFlush.emit(patch);
return patch;
}
public stopAutoFlush?: () => void = undefined;
/**
* Begins to automatically flush buffered operations into patches, grouping
* operations by microtasks or by transactions. To capture the patch, listen
* to the `.onFlush` event.
*
* @returns Callback to stop auto flushing.
*/
public autoFlush(drainNow = false): () => void {
const drain = () => this.builder.patch.ops.length && this.flush();
const onLocalChangesUnsubscribe = this.onLocalChanges.listen(drain);
const onBeforeTransactionUnsubscribe = this.onBeforeTransaction.listen(drain);
const onTransactionUnsubscribe = this.onTransaction.listen(drain);
Iif (drainNow) drain();
return (this.stopAutoFlush = () => {
this.stopAutoFlush = undefined;
onLocalChangesUnsubscribe();
onBeforeTransactionUnsubscribe();
onTransactionUnsubscribe();
});
}
// ---------------------------------------------------------------- SyncStore
public readonly subscribe = (callback: () => void) => this.onChanges.listen(() => callback());
public readonly getSnapshot = () => this.view() as JsonNodeView<N>;
}
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