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LibWeb: Introduce the Environment Settings Object

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The environment settings object is effectively the context a piece of
script is running under, for example, it contains the origin,
responsible document, realm, global object and event loop for the
current context. This effectively replaces ScriptExecutionContext, but
it cannot be removed in this commit as EventTarget still depends on it.

https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object
This commit is contained in:
Luke Wilde 2021-10-14 16:12:53 +01:00 • committed by Linus Groh
parent 4db5406d62
commit f71f404e0c
29 changed files with 883 additions and 86 deletions
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46
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -54,6 +54,7 @@
#include <LibWeb/HTML/HTMLTitleElement.h>
#include <LibWeb/HTML/MessageEvent.h>
#include <LibWeb/HTML/Scripting/ExceptionReporter.h>
#include <LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h>
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/InitialContainingBlock.h>
#include <LibWeb/Layout/TreeBuilder.h>
@ -618,6 +619,13 @@ Color Document::visited_link_color() const
return page()->palette().visited_link();
}
// https://html.spec.whatwg.org/multipage/webappapis.html#relevant-settings-object
HTML::EnvironmentSettingsObject& Document::relevant_settings_object()
{
// Then, the relevant settings object for a platform object o is the environment settings object of the relevant Realm for o.
return verify_cast<HTML::EnvironmentSettingsObject>(*realm().host_defined());
}
JS::Realm& Document::realm()
{
return interpreter().realm();
@ -626,9 +634,47 @@ JS::Realm& Document::realm()
JS::Interpreter& Document::interpreter()
{
if (!m_interpreter) {
// FIXME: This is all ad-hoc. It loosely follows steps 6.4 to 6.9 of https://html.spec.whatwg.org/#initialise-the-document-object
auto& vm = Bindings::main_thread_vm();
// https://html.spec.whatwg.org/multipage/webappapis.html#creating-a-new-javascript-realm
// FIXME: Put all this into it's own function that can be used outside of Document.
// 1. Perform InitializeHostDefinedRealm() with the provided customizations for creating the global object and the global this binding.
// FIXME: Use WindowProxy as the global this value.
m_interpreter = JS::Interpreter::create<Bindings::WindowObject>(vm, *m_window);
// 2. Let realm execution context be the running JavaScript execution context.
auto& realm_execution_context = vm.running_execution_context();
// 3. Remove realm execution context from the JavaScript execution context stack.
vm.execution_context_stack().remove_first_matching([&realm_execution_context](auto* execution_context) {
return execution_context == &realm_execution_context;
});
// FIXME: 4. Let realm be realm execution context's Realm component.
// FIXME: 5. Set realm's agent to agent.
// FIXME: 6. If agent's agent cluster's cross-origin isolation mode is "none", then:
// 1. Let global be realm's global object.
// 2. Let status be ! global.[[Delete]]("SharedArrayBuffer").
// 3. Assert: status is true.
// FIXME: 7. Return realm execution context. (Requires being in it's own function as mentioned above)
// == End of "create a JavaScript realm" ==
// FIXME: 6. Let topLevelCreationURL be creationURL.
// FIXME: 7. Let topLevelOrigin be navigationParams's origin.
// FIXME: 8. If browsingContext is not a top-level browsing context, then:
// 1. Let parentEnvironment be browsingContext's container's relevant settings object.
// 2. Set topLevelCreationURL to parentEnvironment's top-level creation URL.
// 3. Set topLevelOrigin to parentEnvironment's top-level origin.
// FIXME: 9. Set up a window environment settings object with creationURL, realm execution context, navigationParams's reserved environment, topLevelCreationURL, and topLevelOrigin.
// (This is missing reserved environment, topLevelCreationURL and topLevelOrigin. It also assumes creationURL is the document's URL, when it's really "navigationParams's response's URL.")
HTML::WindowEnvironmentSettingsObject::setup(m_url, realm_execution_context);
// NOTE: We must hook `on_call_stack_emptied` after the interpreter was created, as the initialization of the
// WindowsObject can invoke some internal calls, which will eventually lead to this hook being called without
// `m_interpreter` being fully initialized yet.