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Introduce import.meta hook for module script

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This commit is contained in:
CYBAI 2020-05-16 14:09:41 +09:00
parent 0a00ea3db3
commit 6bc624001b
3 changed files with 35 additions and 5 deletions
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36
components/script/script_module.rs
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@ -49,6 +49,7 @@ use js::jsapi::{GetRequestedModules, SetModuleMetadataHook};
use js::jsapi::{GetWaitForAllPromise, ModuleEvaluate, ModuleInstantiate};
use js::jsapi::{Heap, JSContext, JS_ClearPendingException, SetModulePrivate};
use js::jsapi::{JSAutoRealm, JSObject, JSString};
use js::jsapi::{JS_DefineProperty4, JS_NewStringCopyN, JSPROP_ENUMERATE};
use js::jsapi::{SetModuleDynamicImportHook, SetScriptPrivateReferenceHooks};
use js::jsval::{JSVal, PrivateValue, UndefinedValue};
use js::rust::jsapi_wrapped::{GetRequestedModuleSpecifier, JS_GetPendingException};
@ -1063,7 +1064,7 @@ pub unsafe fn EnsureModuleHooksInitialized(rt: *mut JSRuntime) {
}
SetModuleResolveHook(rt, Some(HostResolveImportedModule));
SetModuleMetadataHook(rt, None);
SetModuleMetadataHook(rt, Some(HostPopulateImportMeta));
SetScriptPrivateReferenceHooks(rt, None, None);
SetModuleDynamicImportHook(rt, None);
@ -1118,6 +1119,39 @@ unsafe extern "C" fn HostResolveImportedModule(
unreachable!()
}
#[allow(unsafe_code, non_snake_case)]
/// https://tc39.es/ecma262/#sec-hostgetimportmetaproperties
/// https://html.spec.whatwg.org/multipage/#hostgetimportmetaproperties
unsafe extern "C" fn HostPopulateImportMeta(
cx: *mut JSContext,
reference_private: RawHandleValue,
meta_object: RawHandle<*mut JSObject>,
) -> bool {
let in_realm_proof = AlreadyInRealm::assert_for_cx(SafeJSContext::from_ptr(cx));
let global_scope = GlobalScope::from_context(cx, InRealm::Already(&in_realm_proof));
// Step 2.
let base_url = match (reference_private.to_private() as *const ModuleScript).as_ref() {
Some(module_data) => module_data.base_url.clone(),
None => global_scope.api_base_url(),
};
rooted!(in(cx) let url_string = JS_NewStringCopyN(
cx,
base_url.as_str().as_ptr() as *const i8,
base_url.as_str().len()
));
// Step 3.
JS_DefineProperty4(
cx,
meta_object,
"url\0".as_ptr() as *const i8,
url_string.handle().into_handle(),
JSPROP_ENUMERATE.into(),
)
}
/// https://html.spec.whatwg.org/multipage/#fetch-a-module-script-tree
pub fn fetch_external_module_script(
owner: ModuleOwner,