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127 lines
4 KiB
Rust
127 lines
4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Element an snapshot common logic.
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use crate::gecko_bindings::bindings;
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use crate::gecko_bindings::structs::{self, nsAtom};
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use crate::string_cache::{Atom, WeakAtom};
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use crate::CaseSensitivityExt;
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use selectors::attr::CaseSensitivity;
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/// A function that, given an element of type `T`, allows you to get a single
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/// class or a class list.
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enum Class<'a> {
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None,
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One(*const nsAtom),
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More(&'a [structs::RefPtr<nsAtom>]),
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}
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#[inline(always)]
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fn base_type(attr: &structs::nsAttrValue) -> structs::nsAttrValue_ValueBaseType {
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(attr.mBits & structs::NS_ATTRVALUE_BASETYPE_MASK) as structs::nsAttrValue_ValueBaseType
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}
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#[inline(always)]
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unsafe fn ptr<T>(attr: &structs::nsAttrValue) -> *const T {
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(attr.mBits & !structs::NS_ATTRVALUE_BASETYPE_MASK) as *const T
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}
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#[inline(always)]
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unsafe fn get_class_from_attr(attr: &structs::nsAttrValue) -> Class {
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debug_assert!(bindings::Gecko_AssertClassAttrValueIsSane(attr));
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let base_type = base_type(attr);
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if base_type == structs::nsAttrValue_ValueBaseType_eStringBase {
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return Class::None;
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}
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if base_type == structs::nsAttrValue_ValueBaseType_eAtomBase {
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return Class::One(ptr::<nsAtom>(attr));
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}
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debug_assert_eq!(base_type, structs::nsAttrValue_ValueBaseType_eOtherBase);
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let container = ptr::<structs::MiscContainer>(attr);
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debug_assert_eq!(
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(*container).mType,
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structs::nsAttrValue_ValueType_eAtomArray
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);
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let array = (*container)
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.__bindgen_anon_1
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.mValue
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.as_ref()
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.__bindgen_anon_1
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.mAtomArray
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.as_ref();
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Class::More(&***array)
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}
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#[inline(always)]
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unsafe fn get_id_from_attr(attr: &structs::nsAttrValue) -> &WeakAtom {
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debug_assert_eq!(
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base_type(attr),
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structs::nsAttrValue_ValueBaseType_eAtomBase
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);
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WeakAtom::new(ptr::<nsAtom>(attr))
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}
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/// Find an attribute value with a given name and no namespace.
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#[inline(always)]
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pub fn find_attr<'a>(
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attrs: &'a [structs::AttrArray_InternalAttr],
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name: &Atom,
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) -> Option<&'a structs::nsAttrValue> {
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attrs
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.iter()
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.find(|attr| attr.mName.mBits == name.as_ptr() as usize)
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.map(|attr| &attr.mValue)
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}
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/// Finds the id attribute from a list of attributes.
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#[inline(always)]
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pub fn get_id(attrs: &[structs::AttrArray_InternalAttr]) -> Option<&WeakAtom> {
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Some(unsafe { get_id_from_attr(find_attr(attrs, &atom!("id"))?) })
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}
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/// Given a class name, a case sensitivity, and an array of attributes, returns
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/// whether the class has the attribute that name represents.
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#[inline(always)]
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pub fn has_class(
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name: &Atom,
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case_sensitivity: CaseSensitivity,
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attr: &structs::nsAttrValue,
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) -> bool {
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match unsafe { get_class_from_attr(attr) } {
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Class::None => false,
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Class::One(atom) => unsafe { case_sensitivity.eq_atom(name, WeakAtom::new(atom)) },
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Class::More(atoms) => match case_sensitivity {
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CaseSensitivity::CaseSensitive => {
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atoms.iter().any(|atom| atom.mRawPtr == name.as_ptr())
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},
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CaseSensitivity::AsciiCaseInsensitive => unsafe {
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atoms
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.iter()
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.any(|atom| WeakAtom::new(atom.mRawPtr).eq_ignore_ascii_case(name))
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},
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},
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}
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}
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/// Given an item, a callback, and a getter, execute `callback` for each class
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/// this `item` has.
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#[inline(always)]
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pub fn each_class<F>(attr: &structs::nsAttrValue, mut callback: F)
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where
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F: FnMut(&Atom),
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{
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unsafe {
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match get_class_from_attr(attr) {
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Class::None => {},
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Class::One(atom) => Atom::with(atom, callback),
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Class::More(atoms) => {
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for atom in atoms {
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Atom::with(atom.mRawPtr, &mut callback)
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}
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},
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}
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}
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}
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