mirror of
https://github.com/servo/servo.git
synced 2025-08-03 12:40:06 +01:00
Introduce trait Castable
This trait is used to hold onto the downcast and upcast functions of all castable IDL interfaces. A castable IDL interface is one which either derives from or is derived by other interfaces. The deriving relation is represented by implementations of marker trait DerivedFrom<T: Castable> generated in InheritTypes. /^[ ]*use dom::bindings::codegen::InheritTypes::.*(Base|Cast|Derived)/ { /::[a-zA-Z]+(Base|Cast|Derived);/d s/([{ ])[a-zA-Z]+(Base|Cast|Derived), /\1/g s/([{ ])[a-zA-Z]+(Base|Cast|Derived), /\1/g s/, [a-zA-Z]+(Base|Cast|Derived)([},])/\2/g s/, [a-zA-Z]+(Base|Cast|Derived)([},])/\2/g /\{([a-zA-Z]+(Base|Cast|Derived))?\};$/d s/\{([a-zA-Z_]+)\};$/\1;/ } s/([a-zA-Z]+)Cast::from_ref\(\&?\**([a-zA-Z_]+)(\.r\(\))?\)/\2.upcast::<\1>()/g s/([a-zA-Z]+)Cast::from_ref\(\&?\**([a-zA-Z_]+)(\.[a-zA-Z_]+\(\))?\)/\2\3.upcast::<\1>()/g s/\(([a-zA-Z]+)Cast::from_ref\)/\(Castable::upcast::<\1>\)/g s/([a-zA-Z]+)Cast::from_root/Root::upcast::<\1>/g s/([a-zA-Z]+)Cast::from_layout_js\(\&([a-zA-Z_.]+)\)/\2.upcast::<\1>()/g s/([a-zA-Z]+)Cast::to_ref\(\&?\**([a-zA-Z_]+)(\.r\(\))?\)/\2.downcast::<\1>()/g s/([a-zA-Z]+)Cast::to_ref\(\&?\**([a-zA-Z_]+)(\.[a-zA-Z_]+\(\))?\)/\2\3.downcast::<\1>()/g s/\(([a-zA-Z]+)Cast::to_ref\)/\(Castable::downcast::<\1>\)/g s/([a-zA-Z]+)Cast::to_root/Root::downcast::<\1>/g s/([a-zA-Z]+)Cast::to_layout_js\(&?([a-zA-Z_.]+(\(\))?)\)/\2.downcast::<\1>()/g s/\.is_document\(\)/.is::<Document>()/g s/\.is_htmlanchorelement\(\)/.is::<HTMLAnchorElement>()/g s/\.is_htmlappletelement\(\)/.is::<HTMLAppletElement>()/g s/\.is_htmlareaelement\(\)/.is::<HTMLAreaElement>()/g s/\.is_htmlbodyelement\(\)/.is::<HTMLBodyElement>()/g s/\.is_htmlembedelement\(\)/.is::<HTMLEmbedElement>()/g s/\.is_htmlfieldsetelement\(\)/.is::<HTMLFieldSetElement>()/g s/\.is_htmlformelement\(\)/.is::<HTMLFormElement>()/g s/\.is_htmlframesetelement\(\)/.is::<HTMLFrameSetElement>()/g s/\.is_htmlhtmlelement\(\)/.is::<HTMLHtmlElement>()/g s/\.is_htmlimageelement\(\)/.is::<HTMLImageElement>()/g s/\.is_htmllegendelement\(\)/.is::<HTMLLegendElement>()/g s/\.is_htmloptgroupelement\(\)/.is::<HTMLOptGroupElement>()/g s/\.is_htmloptionelement\(\)/.is::<HTMLOptionElement>()/g s/\.is_htmlscriptelement\(\)/.is::<HTMLScriptElement>()/g s/\.is_htmltabledatacellelement\(\)/.is::<HTMLTableDataCellElement>()/g s/\.is_htmltableheadercellelement\(\)/.is::<HTMLTableHeaderCellElement>()/g s/\.is_htmltablerowelement\(\)/.is::<HTMLTableRowElement>()/g s/\.is_htmltablesectionelement\(\)/.is::<HTMLTableSectionElement>()/g s/\.is_htmltitleelement\(\)/.is::<HTMLTitleElement>()/g
This commit is contained in:
parent
bd363b009d
commit
13ea3ac413
82 changed files with 1124 additions and 1148 deletions
|
@ -24,6 +24,7 @@
|
|||
//!
|
||||
|
||||
use core::nonzero::NonZero;
|
||||
use dom::bindings::conversions::{Castable, DerivedFrom};
|
||||
use dom::bindings::trace::JSTraceable;
|
||||
use dom::bindings::trace::trace_reflector;
|
||||
use dom::bindings::utils::{Reflectable, Reflector};
|
||||
|
@ -34,6 +35,7 @@ use layout_interface::TrustedNodeAddress;
|
|||
use script_task::STACK_ROOTS;
|
||||
use std::cell::UnsafeCell;
|
||||
use std::default::Default;
|
||||
use std::mem;
|
||||
use std::ops::Deref;
|
||||
use std::ptr;
|
||||
use util::mem::HeapSizeOf;
|
||||
|
@ -119,6 +121,24 @@ pub struct LayoutJS<T> {
|
|||
ptr: NonZero<*const T>
|
||||
}
|
||||
|
||||
impl<T: Castable> LayoutJS<T> {
|
||||
/// Cast a DOM object root upwards to one of the interfaces it derives from.
|
||||
pub fn upcast<U>(&self) -> LayoutJS<U> where U: Castable, T: DerivedFrom<U> {
|
||||
unsafe { mem::transmute_copy(self) }
|
||||
}
|
||||
|
||||
/// Cast a DOM object downwards to one of the interfaces it might implement.
|
||||
pub fn downcast<U>(&self) -> Option<LayoutJS<U>> where U: DerivedFrom<T> {
|
||||
unsafe {
|
||||
if (*self.unsafe_get()).is::<U>() {
|
||||
Some(mem::transmute_copy(self))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: Reflectable> LayoutJS<T> {
|
||||
/// Get the reflector.
|
||||
pub unsafe fn get_jsobject(&self) -> *mut JSObject {
|
||||
|
@ -447,6 +467,22 @@ pub struct Root<T: Reflectable> {
|
|||
root_list: *const RootCollection,
|
||||
}
|
||||
|
||||
impl<T: Castable> Root<T> {
|
||||
/// Cast a DOM object root upwards to one of the interfaces it derives from.
|
||||
pub fn upcast<U>(root: Root<T>) -> Root<U> where U: Castable, T: DerivedFrom<U> {
|
||||
unsafe { mem::transmute(root) }
|
||||
}
|
||||
|
||||
/// Cast a DOM object root downwards to one of the interfaces it might implement.
|
||||
pub fn downcast<U>(root: Root<T>) -> Option<Root<U>> where U: DerivedFrom<T> {
|
||||
if root.is::<U>() {
|
||||
Some(unsafe { mem::transmute(root) })
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: Reflectable> Root<T> {
|
||||
/// Create a new stack-bounded root for the provided JS-owned value.
|
||||
/// It cannot not outlive its associated `RootCollection`, and it gives
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue