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Move more foundational types to script_bindings (#35280)

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* script: Move DOMClass to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move DOMJSClass and get_dom_class to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move Castable/DerivedFrom/IDLInterface to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-02-04 05:36:30 -05:00 • committed by GitHub
parent eaaad757e8
commit c0cef69108
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16 changed files with 291 additions and 207 deletions
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52
components/script_bindings/conversions.rs
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@ -8,16 +8,30 @@ use js::conversions::{
latin1_to_string, ConversionResult, FromJSValConvertible, ToJSValConvertible,
};
use js::error::throw_type_error;
use js::glue::{GetProxyHandlerExtra, IsProxyHandlerFamily};
use js::jsapi::{
JSContext, JSString, JS_DeprecatedStringHasLatin1Chars, JS_GetLatin1StringCharsAndLength,
JS_GetTwoByteStringCharsAndLength, JS_NewStringCopyN,
JSContext, JSObject, JSString, JS_DeprecatedStringHasLatin1Chars,
JS_GetLatin1StringCharsAndLength, JS_GetTwoByteStringCharsAndLength, JS_NewStringCopyN,
};
use js::jsval::{ObjectValue, StringValue};
use js::rust::{maybe_wrap_value, HandleValue, MutableHandleValue, ToString};
use js::rust::{
get_object_class, is_dom_class, maybe_wrap_value, HandleValue, MutableHandleValue, ToString,
};
use servo_config::opts;
use crate::inheritance::Castable;
use crate::reflector::Reflector;
use crate::str::{ByteString, DOMString, USVString};
use crate::utils::{DOMClass, DOMJSClass};
/// A trait to check whether a given `JSObject` implements an IDL interface.
pub trait IDLInterface {
/// Returns whether the given DOM class derives that interface.
fn derives(_: &'static DOMClass) -> bool;
}
/// A trait to mark an IDL interface as deriving from another one.
pub trait DerivedFrom<T: Castable>: Castable {}
// http://heycam.github.io/webidl/#es-USVString
impl ToJSValConvertible for USVString {
@ -201,3 +215,35 @@ impl ToJSValConvertible for Reflector {
maybe_wrap_value(cx, rval);
}
}
/// Get the `DOMClass` from `obj`, or `Err(())` if `obj` is not a DOM object.
///
/// # Safety
/// obj must point to a valid, non-null JS object.
#[allow(clippy::result_unit_err)]
pub unsafe fn get_dom_class(obj: *mut JSObject) -> Result<&'static DOMClass, ()> {
let clasp = get_object_class(obj);
if is_dom_class(&*clasp) {
trace!("plain old dom object");
let domjsclass: *const DOMJSClass = clasp as *const DOMJSClass;
return Ok(&(*domjsclass).dom_class);
}
if is_dom_proxy(obj) {
trace!("proxy dom object");
let dom_class: *const DOMClass = GetProxyHandlerExtra(obj) as *const DOMClass;
return Ok(&*dom_class);
}
trace!("not a dom object");
Err(())
}
/// Returns whether `obj` is a DOM object implemented as a proxy.
///
/// # Safety
/// obj must point to a valid, non-null JS object.
pub unsafe fn is_dom_proxy(obj: *mut JSObject) -> bool {
unsafe {
let clasp = get_object_class(obj);
((*clasp).flags & js::JSCLASS_IS_PROXY) != 0 && IsProxyHandlerFamily(obj)
}
}