From 2ee9431f1ba5bf67546bbf85758a01991c40673f Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Sat, 15 Jun 2019 22:44:54 +0200
Subject: idb wip

---
 packages/idb-bridge/src/util/injectKey.ts | 48 +++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 packages/idb-bridge/src/util/injectKey.ts

(limited to 'packages/idb-bridge/src/util/injectKey.ts')

diff --git a/packages/idb-bridge/src/util/injectKey.ts b/packages/idb-bridge/src/util/injectKey.ts
new file mode 100644
index 000000000..89d3a01d8
--- /dev/null
+++ b/packages/idb-bridge/src/util/injectKey.ts
@@ -0,0 +1,48 @@
+import { KeyPath, Value, Key } from "./types";
+import canInjectKey from "./canInjectKey";
+import { DataError } from "./errors";
+import structuredClone from "./structuredClone";
+
+export function injectKey(keyPath: KeyPath, value: Value, key: Key): Value {
+  if (Array.isArray(keyPath)) {
+    // tslint:disable-next-line max-line-length
+    throw new Error(
+      "The key paths used in this section are always strings and never sequences, since it is not possible to create a object store which has a key generator and also has a key path that is a sequence.",
+    );
+  }
+
+  const identifiers = keyPath.split(".");
+  if (identifiers.length === 0) {
+    throw new Error("Assert: identifiers is not empty");
+  }
+
+  const lastIdentifier = identifiers.pop();
+
+  if (lastIdentifier === null || lastIdentifier === undefined) {
+    throw Error();
+  }
+
+  for (const identifier of identifiers) {
+    if (typeof value !== "object" && !Array.isArray(value)) {
+      return false;
+    }
+
+    const hop = value.hasOwnProperty(identifier);
+    if (!hop) {
+      return true;
+    }
+
+    value = value[identifier];
+  }
+
+  if (!(typeof value === "object" || Array.isArray(value))) {
+    throw new Error("can't inject key");
+  }
+
+  const newValue = structuredClone(value);
+  newValue[lastIdentifier] = structuredClone(key);
+
+  return newValue;
+}
+
+export default injectKey;
\ No newline at end of file
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