From f69c13579688371f267d4eb4d38d6efcb3e69a80 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Tue, 15 Nov 2022 01:51:40 +0200
Subject: [PATCH] LibWeb: Implement the 'Entry Realm/{settings,global} object'
 concepts

---
 .../LibWeb/HTML/Scripting/Environments.cpp    | 26 +++++++++++++++++++
 .../LibWeb/HTML/Scripting/Environments.h      |  3 +++
 2 files changed, 29 insertions(+)

diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.cpp
index 4d3e9eccc1..4ae23ada87 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.cpp
@@ -393,6 +393,32 @@ JS::Object& relevant_global_object(JS::Object const& object)
     return relevant_realm(object).global_object();
 }
 
+// https://html.spec.whatwg.org/multipage/webappapis.html#concept-entry-realm
+JS::Realm& entry_realm()
+{
+    auto& event_loop = HTML::main_thread_event_loop();
+    auto& vm = event_loop.vm();
+
+    // With this in hand, we define the entry execution context to be the most recently pushed item in the JavaScript execution context stack that is a realm execution context.
+    // The entry realm is the entry execution context's Realm component.
+    // NOTE: Currently all execution contexts in LibJS are realm execution contexts
+    return *vm.running_execution_context().realm;
+}
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#entry-settings-object
+EnvironmentSettingsObject& entry_settings_object()
+{
+    // Then, the entry settings object is the environment settings object of the entry realm.
+    return Bindings::host_defined_environment_settings_object(entry_realm());
+}
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#entry-global-object
+JS::Object& entry_global_object()
+{
+    // Similarly, the entry global object is the global object of the entry realm.
+    return entry_realm().global_object();
+}
+
 // https://html.spec.whatwg.org/multipage/webappapis.html#secure-context
 bool is_secure_context(Environment const& environment)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
index ea19b05a62..f86932b149 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/Environments.h
@@ -143,6 +143,9 @@ JS::Realm& relevant_realm(JS::Object const&);
 EnvironmentSettingsObject& relevant_settings_object(JS::Object const&);
 EnvironmentSettingsObject& relevant_settings_object(DOM::Node const&);
 JS::Object& relevant_global_object(JS::Object const&);
+JS::Realm& entry_realm();
+EnvironmentSettingsObject& entry_settings_object();
+JS::Object& entry_global_object();
 [[nodiscard]] bool is_secure_context(Environment const&);
 [[nodiscard]] bool is_non_secure_context(Environment const&);