tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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style_rule.rs (2927B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
      4 
      5 //! A style rule.
      6 
      7 use crate::derives::*;
      8 use crate::properties::PropertyDeclarationBlock;
      9 use crate::selector_parser::SelectorImpl;
     10 use crate::shared_lock::{
     11    DeepCloneWithLock, Locked, SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard,
     12 };
     13 use crate::stylesheets::{style_or_page_rule_to_css, CssRules};
     14 use cssparser::SourceLocation;
     15 #[cfg(feature = "gecko")]
     16 use malloc_size_of::{
     17    MallocSizeOf, MallocSizeOfOps, MallocUnconditionalShallowSizeOf, MallocUnconditionalSizeOf,
     18 };
     19 use selectors::SelectorList;
     20 use servo_arc::Arc;
     21 use std::fmt::{self, Write};
     22 use style_traits::CssStringWriter;
     23 
     24 /// A style rule, with selectors and declarations.
     25 #[derive(Debug, ToShmem)]
     26 pub struct StyleRule {
     27    /// The list of selectors in this rule.
     28    pub selectors: SelectorList<SelectorImpl>,
     29    /// The declaration block with the properties it contains.
     30    pub block: Arc<Locked<PropertyDeclarationBlock>>,
     31    /// The nested rules to this style rule. Only non-`None` when nesting is enabled.
     32    pub rules: Option<Arc<Locked<CssRules>>>,
     33    /// The location in the sheet where it was found.
     34    pub source_location: SourceLocation,
     35 }
     36 
     37 impl DeepCloneWithLock for StyleRule {
     38    /// Deep clones this StyleRule.
     39    fn deep_clone_with_lock(
     40        &self,
     41        lock: &SharedRwLock,
     42        guard: &SharedRwLockReadGuard,
     43    ) -> StyleRule {
     44        StyleRule {
     45            selectors: self.selectors.clone(),
     46            block: Arc::new(lock.wrap(self.block.read_with(guard).clone())),
     47            rules: self.rules.as_ref().map(|rules| {
     48                let rules = rules.read_with(guard);
     49                Arc::new(lock.wrap(rules.deep_clone_with_lock(lock, guard)))
     50            }),
     51            source_location: self.source_location.clone(),
     52        }
     53    }
     54 }
     55 
     56 impl StyleRule {
     57    /// Measure heap usage.
     58    #[cfg(feature = "gecko")]
     59    pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
     60        let mut n = 0;
     61        n += self.selectors.unconditional_size_of(ops);
     62        n += self.block.unconditional_shallow_size_of(ops)
     63            + self.block.read_with(guard).size_of(ops);
     64        if let Some(ref rules) = self.rules {
     65            n += rules.unconditional_shallow_size_of(ops)
     66                + rules.read_with(guard).size_of(guard, ops)
     67        }
     68        n
     69    }
     70 }
     71 
     72 impl ToCssWithGuard for StyleRule {
     73    /// https://drafts.csswg.org/cssom/#serialize-a-css-rule CSSStyleRule
     74    fn to_css(&self, guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
     75        use cssparser::ToCss;
     76        self.selectors.to_css(dest)?;
     77        dest.write_char(' ')?;
     78        style_or_page_rule_to_css(self.rules.as_ref(), &self.block, guard, dest)
     79    }
     80 }