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c99bcdd4b8
This was generated with: ./mach cargo fmt --package selectors && ./mach cargo fmt --package servo_arc && ./mach cargo fmt --package style Using rustfmt 0.4.1-nightly (a4462d1 2018-03-26)
61 lines
2 KiB
Rust
61 lines
2 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 http://mozilla.org/MPL/2.0/. */
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//! Element an snapshot common logic.
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use gecko_bindings::structs::nsAtom;
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use selectors::attr::CaseSensitivity;
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use std::{ptr, slice};
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use string_cache::Atom;
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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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pub type ClassOrClassList<T> =
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unsafe extern "C" fn(T, *mut *mut nsAtom, *mut *mut *mut nsAtom) -> u32;
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/// A function to return whether an element of type `T` has a given class.
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///
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/// The `bool` argument represents whether it should compare case-insensitively
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/// or not.
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pub type HasClass<T> = unsafe extern "C" fn(T, *mut nsAtom, bool) -> bool;
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/// Given an item `T`, a class name, and a getter function, return whether that
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/// element has the class that `name` represents.
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#[inline(always)]
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pub fn has_class<T>(
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item: T,
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name: &Atom,
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case_sensitivity: CaseSensitivity,
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getter: HasClass<T>,
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) -> bool {
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let ignore_case = match case_sensitivity {
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CaseSensitivity::CaseSensitive => false,
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CaseSensitivity::AsciiCaseInsensitive => true,
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};
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unsafe { getter(item, name.as_ptr(), ignore_case) }
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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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pub fn each_class<F, T>(item: T, mut callback: F, getter: ClassOrClassList<T>)
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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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let mut class: *mut nsAtom = ptr::null_mut();
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let mut list: *mut *mut nsAtom = ptr::null_mut();
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let length = getter(item, &mut class, &mut list);
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match length {
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0 => {},
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1 => Atom::with(class, callback),
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n => {
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let classes = slice::from_raw_parts(list, n as usize);
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for c in classes {
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Atom::with(*c, &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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