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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 https://mozilla.org/MPL/2.0/. */
//! A list of CSS rules.
use crate::shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked};
use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
use crate::str::CssStringWriter;
use crate::stylesheets::loader::StylesheetLoader;
use crate::stylesheets::rule_parser::{InsertRuleContext, State};
use crate::stylesheets::stylesheet::StylesheetContents;
use crate::stylesheets::{AllowImportRules, CssRule, RulesMutateError};
#[cfg(feature = "gecko")]
use malloc_size_of::{MallocShallowSizeOf, MallocSizeOfOps};
use servo_arc::{Arc, RawOffsetArc};
use std::fmt::{self, Write};
/// A list of CSS rules.
#[derive(Debug, ToShmem)]
pub struct CssRules(pub Vec<CssRule>);
impl CssRules {
/// Whether this CSS rules is empty.
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
}
impl DeepCloneWithLock for CssRules {
fn deep_clone_with_lock(
&self,
lock: &SharedRwLock,
guard: &SharedRwLockReadGuard,
params: &DeepCloneParams,
) -> Self {
CssRules(
self.0
.iter()
.map(|x| x.deep_clone_with_lock(lock, guard, params))
.collect(),
)
}
}
impl CssRules {
/// Measure heap usage.
#[cfg(feature = "gecko")]
pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
let mut n = self.0.shallow_size_of(ops);
for rule in self.0.iter() {
n += rule.size_of(guard, ops);
}
n
}
/// Trivially construct a new set of CSS rules.
pub fn new(rules: Vec<CssRule>, shared_lock: &SharedRwLock) -> Arc<Locked<CssRules>> {
Arc::new(shared_lock.wrap(CssRules(rules)))
}
/// Returns whether all the rules in this list are namespace or import
/// rules.
fn only_ns_or_import(&self) -> bool {
self.0.iter().all(|r| match *r {
CssRule::Namespace(..) | CssRule::Import(..) => true,
_ => false,
})
}
/// <https://drafts.csswg.org/cssom/#remove-a-css-rule>
pub fn remove_rule(&mut self, index: usize) -> Result<(), RulesMutateError> {
// Step 1, 2
if index >= self.0.len() {
return Err(RulesMutateError::IndexSize);
}
{
// Step 3
let ref rule = self.0[index];
// Step 4
if let CssRule::Namespace(..) = *rule {
if !self.only_ns_or_import() {
return Err(RulesMutateError::InvalidState);
}
}
}
// Step 5, 6
self.0.remove(index);
Ok(())
}
/// Serializes this CSSRules to CSS text as a block of rules.
///
/// This should be speced into CSSOM spec at some point. See
/// <https://github.com/w3c/csswg-drafts/issues/1985>
pub fn to_css_block(
&self,
guard: &SharedRwLockReadGuard,
dest: &mut CssStringWriter,
) -> fmt::Result {
dest.write_str(" {")?;
for rule in self.0.iter() {
dest.write_str("\n ")?;
rule.to_css(guard, dest)?;
}
dest.write_str("\n}")
}
}
/// A trait to implement helpers for `Arc<Locked<CssRules>>`.
pub trait CssRulesHelpers {
/// <https://drafts.csswg.org/cssom/#insert-a-css-rule>
///
/// Written in this funky way because parsing an @import rule may cause us
/// to clone a stylesheet from the same document due to caching in the CSS
/// loader.
///
/// TODO(emilio): We could also pass the write guard down into the loader
/// instead, but that seems overkill.
fn insert_rule(
&self,
lock: &SharedRwLock,
rule: &str,
parent_stylesheet_contents: &StylesheetContents,
index: usize,
nested: bool,
loader: Option<&dyn StylesheetLoader>,
allow_import_rules: AllowImportRules,
) -> Result<CssRule, RulesMutateError>;
}
impl CssRulesHelpers for RawOffsetArc<Locked<CssRules>> {
fn insert_rule(
&self,
lock: &SharedRwLock,
rule: &str,
parent_stylesheet_contents: &StylesheetContents,
index: usize,
nested: bool,
loader: Option<&dyn StylesheetLoader>,
allow_import_rules: AllowImportRules,
) -> Result<CssRule, RulesMutateError> {
let new_rule = {
let read_guard = lock.read();
let rules = self.read_with(&read_guard);
// Step 1, 2
if index > rules.0.len() {
return Err(RulesMutateError::IndexSize);
}
// Computes the parser state at the given index
let insert_rule_context = InsertRuleContext {
rule_list: &rules.0,
index,
};
let state = if nested {
State::Body
} else if index == 0 {
State::Start
} else {
insert_rule_context.max_rule_state_at_index(index - 1)
};
// Steps 3, 4, 5, 6
CssRule::parse(
&rule,
insert_rule_context,
parent_stylesheet_contents,
lock,
state,
loader,
allow_import_rules,
)?
};
{
let mut write_guard = lock.write();
let rules = self.write_with(&mut write_guard);
rules.0.insert(index, new_rule.clone());
}
Ok(new_rule)
}
}
|
