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Implement get_attr_for_layout that returns an AttrValue.

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Ms2ger 2015-05-12 13:02:50 +02:00
parent 9951e0b4d6
commit 1b99fd7ecb
2 changed files with 16 additions and 0 deletions
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7
components/script/dom/attr.rs
View file

@ -306,6 +306,7 @@ impl<'a> AttrHelpers<'a> for JSRef<'a, Attr> {
#[allow(unsafe_code)]
pub trait AttrHelpersForLayout {
unsafe fn value_forever(&self) -> &'static AttrValue;
unsafe fn value_ref_forever(&self) -> &'static str;
unsafe fn value_atom_forever(&self) -> Option<Atom>;
unsafe fn value_tokens_forever(&self) -> Option<&'static [Atom]>;
@ -314,6 +315,12 @@ pub trait AttrHelpersForLayout {
#[allow(unsafe_code)]
impl AttrHelpersForLayout for Attr {
#[inline]
unsafe fn value_forever(&self) -> &'static AttrValue {
// This transmute is used to cheat the lifetime restriction.
mem::transmute::<&AttrValue, &AttrValue>(self.value.borrow_for_layout())
}
#[inline]
unsafe fn value_ref_forever(&self) -> &'static str {
// This transmute is used to cheat the lifetime restriction.

9
components/script/dom/element.rs
View file

@ -156,6 +156,8 @@ impl Element {
#[allow(unsafe_code)]
pub trait RawLayoutElementHelpers {
unsafe fn get_attr_for_layout<'a>(&'a self, namespace: &Namespace, name: &Atom)
-> Option<&'a AttrValue>;
unsafe fn get_attr_val_for_layout<'a>(&'a self, namespace: &Namespace, name: &Atom)
-> Option<&'a str>;
unsafe fn get_attr_vals_for_layout<'a>(&'a self, name: &Atom) -> Vec<&'a str>;
@ -190,6 +192,13 @@ unsafe fn get_attr_for_layout(elem: &Element, namespace: &Namespace, name: &Atom
#[allow(unsafe_code)]
impl RawLayoutElementHelpers for Element {
#[inline]
unsafe fn get_attr_for_layout<'a>(&'a self, namespace: &Namespace, name: &Atom)
-> Option<&'a AttrValue> {
get_attr_for_layout(self, namespace, name).map(|attr| {
(*attr.unsafe_get()).value_forever()
})
}
unsafe fn get_attr_val_for_layout<'a>(&'a self, namespace: &Namespace, name: &Atom)
-> Option<&'a str> {
get_attr_for_layout(self, namespace, name).map(|attr| {