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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)
90 lines
3 KiB
Rust
90 lines
3 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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//! A style rule.
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use cssparser::SourceLocation;
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#[cfg(feature = "gecko")]
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use malloc_size_of::{MallocShallowSizeOf, MallocSizeOf, MallocSizeOfOps};
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#[cfg(feature = "gecko")]
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use malloc_size_of::MallocUnconditionalShallowSizeOf;
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use properties::PropertyDeclarationBlock;
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use selector_parser::SelectorImpl;
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use selectors::SelectorList;
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use servo_arc::Arc;
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use shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked};
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use shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
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use std::fmt::{self, Write};
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use str::CssStringWriter;
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/// A style rule, with selectors and declarations.
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#[derive(Debug)]
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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 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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_params: &DeepCloneParams,
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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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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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// We may add measurement of things hanging off the embedded Components
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// later.
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n += self.selectors.0.shallow_size_of(ops);
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for selector in self.selectors.0.iter() {
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// It's safe to measure this ThinArc directly because it's the
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// "primary" reference. (The secondary references are on the
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// Stylist.)
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n += unsafe { ops.malloc_size_of(selector.thin_arc_heap_ptr()) };
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}
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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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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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// Step 1
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self.selectors.to_css(dest)?;
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// Step 2
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dest.write_str(" { ")?;
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// Step 3
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let declaration_block = self.block.read_with(guard);
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declaration_block.to_css(dest)?;
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// Step 4
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if !declaration_block.declarations().is_empty() {
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dest.write_str(" ")?;
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}
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// Step 5
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dest.write_str("}")
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}
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}
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