Implement MV-Register extension

src/json-crdt-extensions/constants.ts

@@ -1,5 +1,5 @@
 export const enum ExtensionId {
-  MvValue = 0,
+  mval = 0,
   Peritext = 1,
   QuillDelta = 2,
 }

src/json-crdt-extensions/mv-value/ValueMv.ts → src/json-crdt-extensions/mval/ValueMv.ts

@@ -36,6 +36,6 @@ export class ValueMv implements ExtensionJsonNode, Printable {
   // ---------------------------------------------------------------- Printable
 
   public toString(tab?: string): string {
-    return this.constructor.name + printTree(tab, [(tab) => this.data.toString(tab)]);
+    return this.name() + printTree(tab, [(tab) => this.data.toString(tab)]);
   }
 }

src/json-crdt-extensions/mv-value/ValueMvApi.ts → src/json-crdt-extensions/mval/ValueMvApi.ts

@@ -9,7 +9,7 @@ export class ValueMvApi extends NodeApi<ValueMv> implements ExtensionApi<ValueMv
     const rgaApi = new ArrApi(node.data, api);
     const length = rgaApi.length();
     rgaApi.del(0, length);
-    rgaApi.ins(0, [builder.constOrJson(json)]);
+    rgaApi.ins(0, [builder.json(json)]);
     rgaApi.node.removeTombstones();
     return this;
   }

src/json-crdt-extensions/mval/__demos__/usage.ts

@@ -0,0 +1,46 @@
+/* tslint:disable no-console */
+
+/**
+ * Run this demo with:
+ *
+ *     npx nodemon -q -x ts-node src/json-crdt-extensions/mval/__demos__/usage.ts
+ */
+
+import {Model, s} from '../../../json-crdt';
+import {ValueMvExt} from '..';
+
+console.clear();
+
+const model = Model.withLogicalClock(1234);
+
+model.ext.register(ValueMvExt);
+
+model.api.root({
+  obj: {
+    mv: ValueMvExt.new(s.con(1)),
+  },
+});
+
+console.log('');
+console.log('Initial value:');
+console.log(model + '');
+
+const api = model.api.in(['obj', 'mv']).asExt(ValueMvExt);
+
+api.set(s.con(5));
+
+console.log('');
+console.log('After update:');
+console.log(model + '');
+
+const model2 = model.fork();
+
+const api2 = model2.api.in(['obj', 'mv']).asExt(ValueMvExt);
+
+api.set(s.con(10));
+api2.set(s.con(20));
+model.applyPatch(model2.api.flush());
+
+console.log('');
+console.log('After two users update concurrently:');
+console.log(model + '');

src/json-crdt-extensions/mv-value/__tests__/extension.spec.ts → src/json-crdt-extensions/mval/__tests__/extension.spec.ts

@@ -2,6 +2,10 @@ import {ValueMvExt} from '..';
 import {konst} from '../../../json-crdt-patch/builder/Konst';
 import {Model} from '../../../json-crdt/model';
 
+test('can specify extension name', () => {
+  expect(ValueMvExt.name).toBe('mval');
+});
+
 test('can create a new multi-value register', () => {
   const model = Model.withLogicalClock();
   model.ext.register(ValueMvExt);

src/json-crdt-extensions/mv-value/index.ts → src/json-crdt-extensions/mval/index.ts

@@ -8,10 +8,11 @@ import type {ArrNode} from '../../json-crdt/nodes/arr/ArrNode';
 import type {ExtensionDefinition} from '../../json-crdt';
 
 export const ValueMvExt: ExtensionDefinition<ArrNode, ValueMv, ValueMvApi> = {
-  id: ExtensionId.MvValue,
+  id: ExtensionId.mval,
+  name: 'mval',
   new: (value: unknown | ITimestampStruct) =>
     ext(
-      ExtensionId.MvValue,
+      ExtensionId.mval,
       delayed((builder) => builder.jsonArr([value])),
     ),
   Node: ValueMv,

src/json-crdt/extensions/Extensions.ts

@@ -31,7 +31,7 @@ export class Extensions implements Printable {
       this.constructor.name +
       printTree(
         tab,
-        keys.map((k) => (tab) => `${k}: ${this.ext[k].Node.name}`),
+        keys.map((k) => (tab) => `${k}: ${this.ext[k].name}`),
       )
     );
   }

src/json-crdt/extensions/types.ts

@@ -15,6 +15,7 @@ export interface ExtensionDefinition<
   EApi extends ExtensionApi<ENode> = ExtensionApi<ENode>,
 > {
   id: number;
+  name: string;
   new: (...args: any[]) => NodeBuilder;
   Node: new (data: Node) => ENode;
   Api: new (node: ENode, api: ModelApi) => EApi;