From eab7a2bb05982252d76d1cb9a080a9666702ed65 Mon Sep 17 00:00:00 2001
From: stelar7 <dudedbz@gmail.com>
Date: Fri, 11 Apr 2025 10:47:08 +0200
Subject: [PATCH] LibWeb/IDB: Implement
 extract_a_key_from_a_value_using_a_key_path

---
 Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp | 14 ++++++++++++++
 Libraries/LibWeb/IndexedDB/Internal/Algorithms.h   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp
index b96a5031872..0c93eb597e7 100644
--- a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp
+++ b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp
@@ -976,4 +976,18 @@ WebIDL::ExceptionOr<ErrorOr<JS::Value>> evaluate_key_path_on_a_value(JS::Realm&
     return value;
 }
 
+// https://w3c.github.io/IndexedDB/#extract-a-key-from-a-value-using-a-key-path
+WebIDL::ExceptionOr<ErrorOr<GC::Ref<Key>>> extract_a_key_from_a_value_using_a_key_path(JS::Realm& realm, JS::Value value, KeyPath const& key_path, bool multi_entry)
+{
+    // 1. Let r be the result of evaluating a key path on a value with value and keyPath. Rethrow any exceptions.
+    // 2. If r is failure, return failure.
+    auto r = TRY(TRY(evaluate_key_path_on_a_value(realm, value, key_path)));
+
+    // 3. Let key be the result of converting a value to a key with r if the multiEntry flag is false,
+    //    and the result of converting a value to a multiEntry key with r otherwise. Rethrow any exceptions.
+    // 4. If key is invalid, return invalid.
+    // 5. Return key.
+    return multi_entry ? TRY(convert_a_value_to_a_multi_entry_key(realm, r)) : TRY(convert_a_value_to_a_key(realm, r));
+}
+
 }
diff --git a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h
index 2eed3c31a3a..89d9edd0827 100644
--- a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h
+++ b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h
@@ -31,5 +31,6 @@ void commit_a_transaction(JS::Realm&, GC::Ref<IDBTransaction>);
 WebIDL::ExceptionOr<JS::Value> clone_in_realm(JS::Realm&, JS::Value, GC::Ref<IDBTransaction>);
 WebIDL::ExceptionOr<ErrorOr<GC::Ref<Key>>> convert_a_value_to_a_multi_entry_key(JS::Realm&, JS::Value);
 WebIDL::ExceptionOr<ErrorOr<JS::Value>> evaluate_key_path_on_a_value(JS::Realm&, JS::Value, KeyPath const&);
+WebIDL::ExceptionOr<ErrorOr<GC::Ref<Key>>> extract_a_key_from_a_value_using_a_key_path(JS::Realm&, JS::Value, KeyPath const&, bool = false);
 
 }