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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 */
//! before-change style: the `@starting-style` rules.
use crate::shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked};
use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
use crate::str::CssStringWriter;
use crate::stylesheets::CssRules;
use cssparser::SourceLocation;
use malloc_size_of::{MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
use servo_arc::Arc;
use std::fmt::{self, Debug, Write};
/// A [`@starting-style`][starting-style] rule.
#[derive(Debug, ToShmem)]
pub struct StartingStyleRule {
/// The nested rules to this starting-style rule.
pub rules: Arc<Locked<CssRules>>,
/// The source position where this starting-style rule was found.
pub source_location: SourceLocation,
impl StartingStyleRule {
/// Measure heap usage.
#[cfg(feature = "gecko")]
pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
self.rules.unconditional_shallow_size_of(ops) +
self.rules.read_with(guard).size_of(guard, ops)
impl ToCssWithGuard for StartingStyleRule {
fn to_css(&self, guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
self.rules.read_with(guard).to_css_block(guard, dest)
impl DeepCloneWithLock for StartingStyleRule {
fn deep_clone_with_lock(
lock: &SharedRwLock,
guard: &SharedRwLockReadGuard,
params: &DeepCloneParams,
) -> Self {
let rules = self.rules.read_with(guard);
StartingStyleRule {
rules: Arc::new(lock.wrap(rules.deep_clone_with_lock(lock, guard, params))),
source_location: self.source_location.clone(),