1 files changed, 85 insertions, 0 deletions
diff --git a/ts/device/object_set.ts b/ts/device/object_set.ts
new file mode 100644
index 000000000..7bc5f1d91
--- /dev/null
+++ b/ts/device/object_set.ts
@@ -0,0 +1,85 @@
+// Copyright 2023 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+type ObjectType = {
+  [index: number | string]: any;
+};
+
+function hasOwnProperty(obj: ObjectType, prop: number | string) {
+  if (obj == null) {
+    return false;
+  }
+  //to handle objects with null prototypes (too edge case?)
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+function hasShallowProperty(obj: ObjectType, prop: number | string) {
+  return (
+    (typeof prop === 'number' && Array.isArray(obj)) ||
+    hasOwnProperty(obj, prop)
+  );
+}
+
+function getShallowProperty(obj: ObjectType, prop: number | string) {
+  if (hasShallowProperty(obj, prop)) {
+    return obj[prop];
+  }
+}
+function getKey(key: string) {
+  const intKey = parseInt(key);
+  if (intKey.toString() === key) {
+    return intKey;
+  }
+  return key;
+}
+
+export function setPathOnObject(
+  obj: ObjectType,
+  path: number | string | Array<number | string>,
+  value: any,
+  doNotReplace: boolean = false,
+) {
+  if (typeof path === 'number') {
+    path = [path];
+  }
+  if (!path || path.length === 0) {
+    return obj;
+  }
+  if (typeof path === 'string') {
+    return setPathOnObject(
+      obj,
+      path.split('.').map(getKey),
+      value,
+      doNotReplace,
+    );
+  }
+  const currentPath = path[0];
+  const currentValue = getShallowProperty(obj, currentPath);
+  if (path.length === 1) {
+    if (currentValue === void 0 || !doNotReplace) {
+      obj[currentPath] = value;
+    }
+    return currentValue;
+  }
+
+  if (currentValue === void 0) {
+    //check if we assume an array
+    if (typeof path[1] === 'number') {
+      obj[currentPath] = [];
+    } else {
+      obj[currentPath] = {};
+    }
+  }
+
+  return setPathOnObject(obj[currentPath], path.slice(1), value, doNotReplace);
+}