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Implement [Func]

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This commit is contained in:
Anthony Ramine 2016-05-21 00:09:06 +02:00
parent 0d04acd50f
commit e179cb02ff
6 changed files with 58 additions and 8 deletions
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12
components/script/dom/bindings/guard.rs
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@ -4,6 +4,7 @@
//! Machinery to conditionally expose things.
use js::jsapi::{HandleObject, JSContext};
use util::prefs::get_pref;
/// A container with a condition.
@ -22,8 +23,10 @@ impl<T: Clone + Copy> Guard<T> {
}
/// Expose the value if the condition is satisfied.
pub fn expose(&self) -> Option<T> {
if self.condition.is_satisfied() {
///
/// The passed handle is the object on which the value may be exposed.
pub unsafe fn expose(&self, cx: *mut JSContext, obj: HandleObject) -> Option<T> {
if self.condition.is_satisfied(cx, obj) {
Some(self.value)
} else {
None
@ -33,6 +36,8 @@ impl<T: Clone + Copy> Guard<T> {
/// A condition to expose things.
pub enum Condition {
/// The condition is satisfied if the function returns true.
Func(unsafe fn(*mut JSContext, HandleObject) -> bool),
/// The condition is satisfied if the preference is set.
Pref(&'static str),
/// The condition is always satisfied.
@ -40,9 +45,10 @@ pub enum Condition {
}
impl Condition {
fn is_satisfied(&self) -> bool {
unsafe fn is_satisfied(&self, cx: *mut JSContext, obj: HandleObject) -> bool {
match *self {
Condition::Pref(name) => get_pref(name).as_boolean().unwrap_or(false),
Condition::Func(f) => f(cx, obj),
Condition::Satisfied => true,
}
}