LibWeb: Implement prepare_to_run_script on a Realm&

Making further progress porting away from depending on the
EnvironmentSettingObject.

Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.cpp

@@ -88,8 +88,8 @@ JS::Completion ClassicScript::run(RethrowErrors rethrow_errors)
     if (can_run_script(realm) == RunScriptDecision::DoNotRun)
         return JS::normal_completion({});
 
-    // 3. Prepare to run script given settings.
-    settings.prepare_to_run_script();
+    // 3. Prepare to run script given realm.
+    prepare_to_run_script(realm);
 
     // 4. Let evaluationStatus be null.
     JS::Completion evaluation_status;

Userland/Libraries/LibWeb/HTML/Scripting/Environments.cpp

@@ -123,12 +123,15 @@ RunScriptDecision can_run_script(JS::Realm const& realm)
 }
 
 // https://html.spec.whatwg.org/multipage/webappapis.html#prepare-to-run-script
-void EnvironmentSettingsObject::prepare_to_run_script()
+// https://whatpr.org/html/9893/b8ea975...df5706b/webappapis.html#prepare-to-run-script
+void prepare_to_run_script(JS::Realm& realm)
 {
-    // 1. Push settings's realm execution context onto the JavaScript execution context stack; it is now the running JavaScript execution context.
-    global_object().vm().push_execution_context(realm_execution_context());
+    // 1. Push realms's execution context onto the JavaScript execution context stack; it is now the running JavaScript execution context.
+    realm.global_object().vm().push_execution_context(execution_context_of_realm(realm));
 
-    // FIXME: 2. Add settings to the currently running task's script evaluation environment settings object set.
+    // FIXME: 2. If realm is a principal realm, then:
+    // FIXME: 2.1 Let settings be realm's settings object.
+    // FIXME: 2.2 Add settings to the currently running task's script evaluation environment settings object set.
 }
 
 // https://whatpr.org/html/9893/b8ea975...df5706b/webappapis.html#concept-realm-execution-context

Userland/Libraries/LibWeb/HTML/Scripting/Environments.h

@@ -96,8 +96,6 @@ public:
     // https://fetch.spec.whatwg.org/#concept-fetch-group
     Vector<JS::NonnullGCPtr<Fetch::Infrastructure::FetchRecord>>& fetch_group() { return m_fetch_group; }
 
-    void prepare_to_run_script();
-
     void prepare_to_run_callback();
     void clean_up_after_running_callback();
 
@@ -137,10 +135,12 @@ private:
 };
 
 JS::ExecutionContext const& execution_context_of_realm(JS::Realm const&);
+inline JS::ExecutionContext& execution_context_of_realm(JS::Realm& realm) { return const_cast<JS::ExecutionContext&>(execution_context_of_realm(const_cast<JS::Realm const&>(realm))); }
 
 RunScriptDecision can_run_script(JS::Realm const&);
 bool is_scripting_enabled(JS::Realm const&);
 bool is_scripting_disabled(JS::Realm const&);
+void prepare_to_run_script(JS::Realm&);
 void clean_up_after_running_script(JS::Realm const&);
 
 EnvironmentSettingsObject& incumbent_settings_object();

Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.cpp

@@ -133,8 +133,8 @@ JS::Promise* JavaScriptModuleScript::run(PreventErrorReporting)
         return promise;
     }
 
-    // 3. Prepare to run script given settings.
-    settings.prepare_to_run_script();
+    // 3. Prepare to run script given realm.
+    prepare_to_run_script(realm);
 
     // 4. Let evaluationPromise be null.
     JS::Promise* evaluation_promise = nullptr;

Userland/Libraries/LibWeb/HTML/Scripting/TemporaryExecutionContext.cpp

@@ -13,7 +13,7 @@ TemporaryExecutionContext::TemporaryExecutionContext(EnvironmentSettingsObject&
     : m_environment_settings(environment_settings)
     , m_callbacks_enabled(callbacks_enabled)
 {
-    m_environment_settings->prepare_to_run_script();
+    prepare_to_run_script(m_environment_settings->realm());
     if (m_callbacks_enabled == CallbacksEnabled::Yes)
         m_environment_settings->prepare_to_run_callback();
 }