79 lines
2.8 KiB
Rust
79 lines
2.8 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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//! A style rule.
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use crate::properties::PropertyDeclarationBlock;
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use crate::selector_parser::SelectorImpl;
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use crate::shared_lock::{
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DeepCloneWithLock, Locked, SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard,
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};
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use crate::str::CssStringWriter;
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use crate::stylesheets::{CssRules, style_or_page_rule_to_css};
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use cssparser::SourceLocation;
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#[cfg(feature = "gecko")]
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use malloc_size_of::{
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MallocSizeOf, MallocSizeOfOps, MallocUnconditionalShallowSizeOf, MallocUnconditionalSizeOf,
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};
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use selectors::SelectorList;
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use servo_arc::Arc;
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use std::fmt::{self, Write};
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/// A style rule, with selectors and declarations.
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#[derive(Debug, ToShmem)]
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pub struct StyleRule {
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/// The list of selectors in this rule.
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pub selectors: SelectorList<SelectorImpl>,
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/// The declaration block with the properties it contains.
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pub block: Arc<Locked<PropertyDeclarationBlock>>,
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/// The nested rules to this style rule. Only non-`None` when nesting is enabled.
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pub rules: Option<Arc<Locked<CssRules>>>,
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/// The location in the sheet where it was found.
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pub source_location: SourceLocation,
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}
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impl DeepCloneWithLock for StyleRule {
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/// Deep clones this StyleRule.
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fn deep_clone_with_lock(
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&self,
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lock: &SharedRwLock,
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guard: &SharedRwLockReadGuard,
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) -> StyleRule {
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StyleRule {
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selectors: self.selectors.clone(),
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block: Arc::new(lock.wrap(self.block.read_with(guard).clone())),
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rules: self.rules.as_ref().map(|rules| {
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let rules = rules.read_with(guard);
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Arc::new(lock.wrap(rules.deep_clone_with_lock(lock, guard)))
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}),
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source_location: self.source_location.clone(),
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}
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}
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}
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impl StyleRule {
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/// Measure heap usage.
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#[cfg(feature = "gecko")]
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pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
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let mut n = 0;
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n += self.selectors.unconditional_size_of(ops);
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n += self.block.unconditional_shallow_size_of(ops) +
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self.block.read_with(guard).size_of(ops);
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if let Some(ref rules) = self.rules {
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n += rules.unconditional_shallow_size_of(ops) +
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rules.read_with(guard).size_of(guard, ops)
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}
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n
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}
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}
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impl ToCssWithGuard for StyleRule {
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/// https://drafts.csswg.org/cssom/#serialize-a-css-rule CSSStyleRule
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fn to_css(&self, guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
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use cssparser::ToCss;
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self.selectors.to_css(dest)?;
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dest.write_char(' ')?;
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style_or_page_rule_to_css(self.rules.as_ref(), &self.block, guard, dest)
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}
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}
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