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Document proxyhandler.rs.

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Ms2ger 2015-01-21 09:39:52 +01:00
parent 46e4ac280f
commit 1cf7441c61
1 changed files with 17 additions and 1 deletions
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18
components/script/dom/bindings/proxyhandler.rs
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@ -2,7 +2,9 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
///! Utilities for the implementation of JSAPI proxy handlers.
//! Utilities for the implementation of JSAPI proxy handlers.
#![deny(missing_docs)]
use dom::bindings::conversions::is_dom_proxy;
use dom::bindings::utils::delete_property_by_id;
@ -25,6 +27,10 @@ use std::ptr;
static JSPROXYSLOT_EXPANDO: u32 = 0;
/// Invoke the [[GetOwnProperty]] trap (`getOwnPropertyDescriptor`) on `proxy`,
/// with argument `id` and return the result, if it is not `undefined`.
/// Otherwise, walk along the prototype chain to find a property with that
/// name.
pub unsafe extern fn getPropertyDescriptor(cx: *mut JSContext, proxy: *mut JSObject,
id: jsid, set: bool,
desc: *mut JSPropertyDescriptor)
@ -47,6 +53,7 @@ pub unsafe extern fn getPropertyDescriptor(cx: *mut JSContext, proxy: *mut JSObj
JS_GetPropertyDescriptorById(cx, proto, id, JSRESOLVE_QUALIFIED, desc) != 0
}
/// Defines an expando on the given `proxy`.
pub unsafe extern fn defineProperty_(cx: *mut JSContext, proxy: *mut JSObject, id: jsid,
desc: *mut JSPropertyDescriptor) -> bool {
static JSMSG_GETTER_ONLY: libc::c_uint = 160;
@ -67,6 +74,7 @@ pub unsafe extern fn defineProperty_(cx: *mut JSContext, proxy: *mut JSObject, i
(*desc).setter, (*desc).attrs) != 0;
}
/// Deletes an expando off the given `proxy`.
pub unsafe extern fn delete_(cx: *mut JSContext, proxy: *mut JSObject, id: jsid,
bp: *mut bool) -> bool {
let expando = GetExpandoObject(proxy);
@ -78,6 +86,7 @@ pub unsafe extern fn delete_(cx: *mut JSContext, proxy: *mut JSObject, id: jsid,
return delete_property_by_id(cx, expando, id, &mut *bp);
}
/// Returns the stringification of an object with class `name`.
pub fn _obj_toString(cx: *mut JSContext, name: &str) -> *mut JSString {
unsafe {
let result = format!("[object {}]", name);
@ -91,6 +100,7 @@ pub fn _obj_toString(cx: *mut JSContext, name: &str) -> *mut JSString {
}
}
/// Get the expando object, or null if there is none.
pub fn GetExpandoObject(obj: *mut JSObject) -> *mut JSObject {
unsafe {
assert!(is_dom_proxy(obj));
@ -103,6 +113,8 @@ pub fn GetExpandoObject(obj: *mut JSObject) -> *mut JSObject {
}
}
/// Get the expando object, or create it if it doesn't exist yet.
/// Fails on JSAPI failure.
pub fn EnsureExpandoObject(cx: *mut JSContext, obj: *mut JSObject) -> *mut JSObject {
unsafe {
assert!(is_dom_proxy(obj));
@ -119,6 +131,8 @@ pub fn EnsureExpandoObject(cx: *mut JSContext, obj: *mut JSObject) -> *mut JSObj
}
}
/// Set the property descriptor's object to `obj` and set it to enumerable,
/// and writable if `readonly` is true.
pub fn FillPropertyDescriptor(desc: &mut JSPropertyDescriptor, obj: *mut JSObject, readonly: bool) {
desc.obj = obj;
desc.attrs = if readonly { JSPROP_READONLY } else { 0 } | JSPROP_ENUMERATE;
@ -127,12 +141,14 @@ pub fn FillPropertyDescriptor(desc: &mut JSPropertyDescriptor, obj: *mut JSObjec
desc.shortid = 0;
}
/// No-op required hook.
pub unsafe extern fn getOwnPropertyNames_(_cx: *mut JSContext,
_obj: *mut JSObject,
_v: *mut AutoIdVector) -> bool {
true
}
/// No-op required hook.
pub unsafe extern fn enumerate_(_cx: *mut JSContext, _obj: *mut JSObject,
_v: *mut AutoIdVector) -> bool {
true