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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Element an snapshot common logic.
use crate::dom::TElement;
use crate::gecko_bindings::bindings;
use crate::gecko_bindings::structs::{self, nsAtom};
use crate::invalidation::element::element_wrapper::ElementSnapshot;
use crate::selector_parser::SnapshotMap;
use crate::string_cache::WeakAtom;
use crate::values::AtomIdent;
use crate::Atom;
use crate::CaseSensitivityExt;
use selectors::attr::CaseSensitivity;
use smallvec::SmallVec;
/// A function that, given an element of type `T`, allows you to get a single
/// class or a class list.
enum Class<'a> {
None,
One(*const nsAtom),
More(&'a [structs::RefPtr<nsAtom>]),
}
#[inline(always)]
fn base_type(attr: &structs::nsAttrValue) -> structs::nsAttrValue_ValueBaseType {
(attr.mBits & structs::NS_ATTRVALUE_BASETYPE_MASK) as structs::nsAttrValue_ValueBaseType
}
#[inline(always)]
unsafe fn ptr<T>(attr: &structs::nsAttrValue) -> *const T {
(attr.mBits & !structs::NS_ATTRVALUE_BASETYPE_MASK) as *const T
}
#[inline(always)]
unsafe fn get_class_or_part_from_attr(attr: &structs::nsAttrValue) -> Class {
debug_assert!(bindings::Gecko_AssertClassAttrValueIsSane(attr));
let base_type = base_type(attr);
if base_type == structs::nsAttrValue_ValueBaseType_eAtomBase {
return Class::One(ptr::<nsAtom>(attr));
}
if base_type == structs::nsAttrValue_ValueBaseType_eOtherBase {
let container = ptr::<structs::MiscContainer>(attr);
debug_assert_eq!(
(*container).mType,
structs::nsAttrValue_ValueType_eAtomArray
);
// NOTE: Bindgen doesn't deal with AutoTArray, so cast it below.
let attr_array: *mut _ = *(*container)
.__bindgen_anon_1
.mValue
.as_ref()
.__bindgen_anon_1
.mAtomArray
.as_ref();
let array =
(*attr_array).mArray.as_ptr() as *const structs::nsTArray<structs::RefPtr<nsAtom>>;
return Class::More(&**array);
}
debug_assert_eq!(base_type, structs::nsAttrValue_ValueBaseType_eStringBase);
Class::None
}
#[inline(always)]
unsafe fn get_id_from_attr(attr: &structs::nsAttrValue) -> &WeakAtom {
debug_assert_eq!(
base_type(attr),
structs::nsAttrValue_ValueBaseType_eAtomBase
);
WeakAtom::new(ptr::<nsAtom>(attr))
}
/// Find an attribute value with a given name and no namespace.
#[inline(always)]
pub fn find_attr<'a>(
attrs: &'a [structs::AttrArray_InternalAttr],
name: &Atom,
) -> Option<&'a structs::nsAttrValue> {
attrs
.iter()
.find(|attr| attr.mName.mBits == name.as_ptr() as usize)
.map(|attr| &attr.mValue)
}
/// Finds the id attribute from a list of attributes.
#[inline(always)]
pub fn get_id(attrs: &[structs::AttrArray_InternalAttr]) -> Option<&WeakAtom> {
Some(unsafe { get_id_from_attr(find_attr(attrs, &atom!("id"))?) })
}
#[inline(always)]
pub(super) fn each_exported_part(
attrs: &[structs::AttrArray_InternalAttr],
name: &AtomIdent,
mut callback: impl FnMut(&AtomIdent),
) {
let attr = match find_attr(attrs, &atom!("exportparts")) {
Some(attr) => attr,
None => return,
};
let mut length = 0;
let atoms = unsafe { bindings::Gecko_Element_ExportedParts(attr, name.as_ptr(), &mut length) };
if atoms.is_null() {
return;
}
unsafe {
for atom in std::slice::from_raw_parts(atoms, length) {
AtomIdent::with(*atom, &mut callback)
}
}
}
#[inline(always)]
pub(super) fn imported_part(
attrs: &[structs::AttrArray_InternalAttr],
name: &AtomIdent,
) -> Option<AtomIdent> {
let attr = find_attr(attrs, &atom!("exportparts"))?;
let atom = unsafe { bindings::Gecko_Element_ImportedPart(attr, name.as_ptr()) };
if atom.is_null() {
return None;
}
Some(AtomIdent(unsafe { Atom::from_raw(atom) }))
}
/// Given a class or part name, a case sensitivity, and an array of attributes,
/// returns whether the attribute has that name.
#[inline(always)]
pub fn has_class_or_part(
name: &AtomIdent,
case_sensitivity: CaseSensitivity,
attr: &structs::nsAttrValue,
) -> bool {
match unsafe { get_class_or_part_from_attr(attr) } {
Class::None => false,
Class::One(atom) => unsafe { case_sensitivity.eq_atom(name, WeakAtom::new(atom)) },
Class::More(atoms) => match case_sensitivity {
CaseSensitivity::CaseSensitive => {
let name_ptr = name.as_ptr();
atoms.iter().any(|atom| atom.mRawPtr == name_ptr)
},
CaseSensitivity::AsciiCaseInsensitive => unsafe {
atoms
.iter()
.any(|atom| WeakAtom::new(atom.mRawPtr).eq_ignore_ascii_case(name))
},
},
}
}
/// Given an item, a callback, and a getter, execute `callback` for each class
/// or part name this `item` has.
#[inline(always)]
pub fn each_class_or_part<F>(attr: &structs::nsAttrValue, mut callback: F)
where
F: FnMut(&AtomIdent),
{
unsafe {
match get_class_or_part_from_attr(attr) {
Class::None => {},
Class::One(atom) => AtomIdent::with(atom, callback),
Class::More(atoms) => {
for atom in atoms {
AtomIdent::with(atom.mRawPtr, &mut callback)
}
},
}
}
}
/// Returns a list of classes that were either added to or removed from the
/// element since the snapshot.
pub fn classes_changed<E: TElement>(element: &E, snapshots: &SnapshotMap) -> SmallVec<[Atom; 8]> {
debug_assert!(element.has_snapshot(), "Why bothering?");
let snapshot = snapshots.get(element).expect("has_snapshot lied");
if !snapshot.class_changed() {
return SmallVec::new();
}
let mut classes_changed = SmallVec::<[Atom; 8]>::new();
snapshot.each_class(|c| {
if !element.has_class(c, CaseSensitivity::CaseSensitive) {
classes_changed.push(c.0.clone());
}
});
element.each_class(|c| {
if !snapshot.has_class(c, CaseSensitivity::CaseSensitive) {
classes_changed.push(c.0.clone());
}
});
classes_changed
}
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