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move Castable into dom::bindings::inheritance

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This commit is contained in:
rohan.prinja 2015-10-27 14:56:41 +09:00
parent 00b60b9386
commit bb2536cd01
78 changed files with 133 additions and 115 deletions
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27
components/script/dom/bindings/conversions.rs
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@ -34,6 +34,7 @@
use core::nonzero::NonZero;
use dom::bindings::error::throw_type_error;
use dom::bindings::inheritance::Castable;
use dom::bindings::js::Root;
use dom::bindings::num::Finite;
use dom::bindings::str::{ByteString, USVString};
@ -107,32 +108,6 @@ pub trait IDLInterface {
fn derives(&'static DOMClass) -> bool;
}
/// A trait to hold the cast functions of IDL interfaces that either derive
/// or are derived from other interfaces.
pub trait Castable: IDLInterface + Reflectable + Sized {
/// Check whether a DOM object implements one of its deriving interfaces.
fn is<T>(&self) -> bool where T: DerivedFrom<Self> {
let class = unsafe {
get_dom_class(self.reflector().get_jsobject().get()).unwrap()
};
T::derives(class)
}
/// Cast a DOM object upwards to one of the interfaces it derives from.
fn upcast<T>(&self) -> &T where T: Castable, Self: DerivedFrom<T> {
unsafe { mem::transmute(self) }
}
/// Cast a DOM object downwards to one of the interfaces it might implement.
fn downcast<T>(&self) -> Option<&T> where T: DerivedFrom<Self> {
if self.is::<T>() {
Some(unsafe { mem::transmute(self) })
} else {
None
}
}
}
/// A trait to mark an IDL interface as deriving from another one.
#[rustc_on_unimplemented = "The IDL interface `{Self}` is not derived from `{T}`."]
pub trait DerivedFrom<T: Castable>: Castable {}