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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
//! Rust helpers for Gecko's `nsStyleAutoArray`.
use crate::gecko_bindings::bindings::Gecko_EnsureStyleAnimationArrayLength;
use crate::gecko_bindings::bindings::Gecko_EnsureStyleScrollTimelineArrayLength;
use crate::gecko_bindings::bindings::Gecko_EnsureStyleTransitionArrayLength;
use crate::gecko_bindings::bindings::Gecko_EnsureStyleViewTimelineArrayLength;
use crate::gecko_bindings::structs::nsStyleAutoArray;
use crate::gecko_bindings::structs::{StyleAnimation, StyleTransition};
use crate::gecko_bindings::structs::{StyleScrollTimeline, StyleViewTimeline};
use std::iter::{once, Chain, Once};
use std::ops::{Index, IndexMut};
use std::slice::{Iter, IterMut};
impl<T> Index<usize> for nsStyleAutoArray<T> {
type Output = T;
fn index(&self, index: usize) -> &T {
match index {
0 => &self.mFirstElement,
_ => &self.mOtherElements[index - 1],
}
}
}
impl<T> IndexMut<usize> for nsStyleAutoArray<T> {
fn index_mut(&mut self, index: usize) -> &mut T {
match index {
0 => &mut self.mFirstElement,
_ => &mut self.mOtherElements[index - 1],
}
}
}
impl<T> nsStyleAutoArray<T> {
/// Mutably iterate over the array elements.
pub fn iter_mut(&mut self) -> Chain<Once<&mut T>, IterMut<T>> {
once(&mut self.mFirstElement).chain(self.mOtherElements.iter_mut())
}
/// Iterate over the array elements.
pub fn iter(&self) -> Chain<Once<&T>, Iter<T>> {
once(&self.mFirstElement).chain(self.mOtherElements.iter())
}
/// Returns the length of the array.
///
/// Note that often structs containing autoarrays will have additional
/// member fields that contain the length, which must be kept in sync.
pub fn len(&self) -> usize {
1 + self.mOtherElements.len()
}
}
impl nsStyleAutoArray<StyleAnimation> {
/// Ensures that the array has length at least the given length.
pub fn ensure_len(&mut self, len: usize) {
unsafe {
Gecko_EnsureStyleAnimationArrayLength(
self as *mut nsStyleAutoArray<StyleAnimation> as *mut _,
len,
);
}
}
}
impl nsStyleAutoArray<StyleTransition> {
/// Ensures that the array has length at least the given length.
pub fn ensure_len(&mut self, len: usize) {
unsafe {
Gecko_EnsureStyleTransitionArrayLength(
self as *mut nsStyleAutoArray<StyleTransition> as *mut _,
len,
);
}
}
}
impl nsStyleAutoArray<StyleViewTimeline> {
/// Ensures that the array has length at least the given length.
pub fn ensure_len(&mut self, len: usize) {
unsafe {
Gecko_EnsureStyleViewTimelineArrayLength(
self as *mut nsStyleAutoArray<StyleViewTimeline> as *mut _,
len,
);
}
}
}
impl nsStyleAutoArray<StyleScrollTimeline> {
/// Ensures that the array has length at least the given length.
pub fn ensure_len(&mut self, len: usize) {
unsafe {
Gecko_EnsureStyleScrollTimelineArrayLength(
self as *mut nsStyleAutoArray<StyleScrollTimeline> as *mut _,
len,
);
}
}
}
impl<'a, T> IntoIterator for &'a mut nsStyleAutoArray<T> {
type Item = &'a mut T;
type IntoIter = Chain<Once<&'a mut T>, IterMut<'a, T>>;
fn into_iter(self) -> Self::IntoIter {
self.iter_mut()
}
}