Update model and add invalidated cycle

src/model/DataModel.ts

@@ -1,12 +1,39 @@
 import { RootNode } from "../nodes/RootNode"
 import { Path } from "./Path"
 
+export interface ModelListener {
+  invalidated(model: DataModel): void
+}
+
 export class DataModel {
   data: any
   schema: RootNode
+  listeners: ModelListener[]
 
   constructor(schema: RootNode) {
     this.schema = schema
     this.data = schema.default
+    this.listeners = []
+  }
+
+  addListener(listener: ModelListener) {
+    this.listeners.push(listener)
+  }
+
+  invalidate() {
+    this.listeners.forEach(listener => listener.invalidated(this))
+  }
+
+  set(path: Path, value: any) {
+    let node = this.data;
+    for (let index of path.pop()) {
+      if (node[index] === undefined) {
+        node[index] = {}
+      }
+      node = node[index]
+    }
+    node[path.last()] = value
+
+    this.invalidate()
   }
 }

src/model/Path.ts

@@ -1,7 +1,7 @@
 
 type PathElement = (string | number)
 
-export class Path {
+export class Path implements Iterable<PathElement> {
   private arr: PathElement[]
 
   constructor(arr?: PathElement[]) {
@@ -23,4 +23,14 @@ export class Path {
   copy(): Path {
     return new Path([...this.arr])
   }
+
+  toString(): string {
+    return `[${this.arr.map(e => e.toString()).join(', ')}]`
+  }
+
+  *[Symbol.iterator]() {
+    for (const e of this.arr) {
+      yield e
+    }
+  }
 }