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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/. */
+
+//! Style sheets and their CSS rules.
+
+mod cascading_at_rule;
+pub mod container_rule;
+mod counter_style_rule;
+mod document_rule;
+mod font_face_rule;
+pub mod font_feature_values_rule;
+pub mod font_palette_values_rule;
+pub mod import_rule;
+pub mod keyframes_rule;
+pub mod layer_rule;
+mod loader;
+mod media_rule;
+mod namespace_rule;
+pub mod origin;
+mod page_rule;
+mod property_rule;
+mod rule_list;
+mod rule_parser;
+mod rules_iterator;
+mod style_rule;
+mod stylesheet;
+pub mod supports_rule;
+pub mod viewport_rule;
+
+#[cfg(feature = "gecko")]
+use crate::gecko_bindings::sugar::refptr::RefCounted;
+#[cfg(feature = "gecko")]
+use crate::gecko_bindings::{bindings, structs};
+use crate::parser::ParserContext;
+use crate::shared_lock::{DeepCloneParams, DeepCloneWithLock, Locked};
+use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
+use crate::str::CssStringWriter;
+use cssparser::{parse_one_rule, Parser, ParserInput};
+#[cfg(feature = "gecko")]
+use malloc_size_of::{MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
+use servo_arc::Arc;
+use std::borrow::Cow;
+use std::fmt;
+#[cfg(feature = "gecko")]
+use std::mem::{self, ManuallyDrop};
+use style_traits::ParsingMode;
+#[cfg(feature = "gecko")]
+use to_shmem::{self, SharedMemoryBuilder, ToShmem};
+
+pub use self::container_rule::ContainerRule;
+pub use self::counter_style_rule::CounterStyleRule;
+pub use self::document_rule::DocumentRule;
+pub use self::font_face_rule::FontFaceRule;
+pub use self::font_feature_values_rule::FontFeatureValuesRule;
+pub use self::font_palette_values_rule::FontPaletteValuesRule;
+pub use self::import_rule::ImportRule;
+pub use self::keyframes_rule::KeyframesRule;
+pub use self::layer_rule::{LayerBlockRule, LayerStatementRule};
+pub use self::loader::StylesheetLoader;
+pub use self::media_rule::MediaRule;
+pub use self::namespace_rule::NamespaceRule;
+pub use self::origin::{Origin, OriginSet, OriginSetIterator, PerOrigin, PerOriginIter};
+pub use self::page_rule::{PageRule, PageSelector, PageSelectors};
+pub use self::property_rule::PropertyRule;
+pub use self::rule_list::{CssRules, CssRulesHelpers};
+pub use self::rule_parser::{InsertRuleContext, State, TopLevelRuleParser};
+pub use self::rules_iterator::{AllRules, EffectiveRules};
+pub use self::rules_iterator::{
+ EffectiveRulesIterator, NestedRuleIterationCondition, RulesIterator,
+};
+pub use self::style_rule::StyleRule;
+pub use self::stylesheet::{AllowImportRules, SanitizationData, SanitizationKind};
+pub use self::stylesheet::{DocumentStyleSheet, Namespaces, Stylesheet};
+pub use self::stylesheet::{StylesheetContents, StylesheetInDocument, UserAgentStylesheets};
+pub use self::supports_rule::SupportsRule;
+pub use self::viewport_rule::ViewportRule;
+
+/// The CORS mode used for a CSS load.
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, ToShmem)]
+pub enum CorsMode {
+ /// No CORS mode, so cross-origin loads can be done.
+ None,
+ /// Anonymous CORS request.
+ Anonymous,
+}
+
+/// Extra data that the backend may need to resolve url values.
+///
+/// If the usize's lowest bit is 0, then this is a strong reference to a
+/// structs::URLExtraData object.
+///
+/// Otherwise, shifting the usize's bits the right by one gives the
+/// UserAgentStyleSheetID value corresponding to the style sheet whose
+/// URLExtraData this is, which is stored in URLExtraData_sShared. We don't
+/// hold a strong reference to that object from here, but we rely on that
+/// array's objects being held alive until shutdown.
+///
+/// We use this packed representation rather than an enum so that
+/// `from_ptr_ref` can work.
+#[cfg(feature = "gecko")]
+#[derive(PartialEq)]
+#[repr(C)]
+pub struct UrlExtraData(usize);
+
+/// Extra data that the backend may need to resolve url values.
+#[cfg(not(feature = "gecko"))]
+pub type UrlExtraData = ::servo_url::ServoUrl;
+
+#[cfg(feature = "gecko")]
+impl Clone for UrlExtraData {
+ fn clone(&self) -> UrlExtraData {
+ UrlExtraData::new(self.ptr())
+ }
+}
+
+#[cfg(feature = "gecko")]
+impl Drop for UrlExtraData {
+ fn drop(&mut self) {
+ // No need to release when we have an index into URLExtraData_sShared.
+ if self.0 & 1 == 0 {
+ unsafe {
+ self.as_ref().release();
+ }
+ }
+ }
+}
+
+#[cfg(feature = "gecko")]
+impl ToShmem for UrlExtraData {
+ fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> to_shmem::Result<Self> {
+ if self.0 & 1 == 0 {
+ let shared_extra_datas = unsafe { &structs::URLExtraData_sShared };
+ let self_ptr = self.as_ref() as *const _ as *mut _;
+ let sheet_id = shared_extra_datas
+ .iter()
+ .position(|r| r.mRawPtr == self_ptr);
+ let sheet_id = match sheet_id {
+ Some(id) => id,
+ None => {
+ return Err(String::from(
+ "ToShmem failed for UrlExtraData: expected sheet's URLExtraData to be in \
+ URLExtraData::sShared",
+ ));
+ },
+ };
+ Ok(ManuallyDrop::new(UrlExtraData((sheet_id << 1) | 1)))
+ } else {
+ Ok(ManuallyDrop::new(UrlExtraData(self.0)))
+ }
+ }
+}
+
+#[cfg(feature = "gecko")]
+impl UrlExtraData {
+ /// Create a new UrlExtraData wrapping a pointer to the specified Gecko
+ /// URLExtraData object.
+ pub fn new(ptr: *mut structs::URLExtraData) -> UrlExtraData {
+ unsafe {
+ (*ptr).addref();
+ }
+ UrlExtraData(ptr as usize)
+ }
+
+ /// True if this URL scheme is chrome.
+ #[inline]
+ pub fn chrome_rules_enabled(&self) -> bool {
+ self.as_ref().mChromeRulesEnabled
+ }
+
+ /// Create a reference to this `UrlExtraData` from a reference to pointer.
+ ///
+ /// The pointer must be valid and non null.
+ ///
+ /// This method doesn't touch refcount.
+ #[inline]
+ pub unsafe fn from_ptr_ref(ptr: &*mut structs::URLExtraData) -> &Self {
+ mem::transmute(ptr)
+ }
+
+ /// Returns a pointer to the Gecko URLExtraData object.
+ pub fn ptr(&self) -> *mut structs::URLExtraData {
+ if self.0 & 1 == 0 {
+ self.0 as *mut structs::URLExtraData
+ } else {
+ unsafe {
+ let sheet_id = self.0 >> 1;
+ structs::URLExtraData_sShared[sheet_id].mRawPtr
+ }
+ }
+ }
+
+ fn as_ref(&self) -> &structs::URLExtraData {
+ unsafe { &*(self.ptr() as *const structs::URLExtraData) }
+ }
+}
+
+#[cfg(feature = "gecko")]
+impl fmt::Debug for UrlExtraData {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ macro_rules! define_debug_struct {
+ ($struct_name:ident, $gecko_class:ident, $debug_fn:ident) => {
+ struct $struct_name(*mut structs::$gecko_class);
+ impl fmt::Debug for $struct_name {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ use nsstring::nsCString;
+ let mut spec = nsCString::new();
+ unsafe {
+ bindings::$debug_fn(self.0, &mut spec);
+ }
+ spec.fmt(formatter)
+ }
+ }
+ };
+ }
+
+ define_debug_struct!(DebugURI, nsIURI, Gecko_nsIURI_Debug);
+ define_debug_struct!(
+ DebugReferrerInfo,
+ nsIReferrerInfo,
+ Gecko_nsIReferrerInfo_Debug
+ );
+
+ formatter
+ .debug_struct("URLExtraData")
+ .field("chrome_rules_enabled", &self.chrome_rules_enabled())
+ .field("base", &DebugURI(self.as_ref().mBaseURI.raw()))
+ .field(
+ "referrer",
+ &DebugReferrerInfo(self.as_ref().mReferrerInfo.raw()),
+ )
+ .finish()
+ }
+}
+
+// XXX We probably need to figure out whether we should mark Eq here.
+// It is currently marked so because properties::UnparsedValue wants Eq.
+#[cfg(feature = "gecko")]
+impl Eq for UrlExtraData {}
+
+/// A CSS rule.
+///
+/// TODO(emilio): Lots of spec links should be around.
+#[derive(Clone, Debug, ToShmem)]
+#[allow(missing_docs)]
+pub enum CssRule {
+ // No Charset here, CSSCharsetRule has been removed from CSSOM
+ // https://drafts.csswg.org/cssom/#changes-from-5-december-2013
+ Namespace(Arc<NamespaceRule>),
+ Import(Arc<Locked<ImportRule>>),
+ Style(Arc<Locked<StyleRule>>),
+ Media(Arc<MediaRule>),
+ Container(Arc<ContainerRule>),
+ FontFace(Arc<Locked<FontFaceRule>>),
+ FontFeatureValues(Arc<FontFeatureValuesRule>),
+ FontPaletteValues(Arc<FontPaletteValuesRule>),
+ CounterStyle(Arc<Locked<CounterStyleRule>>),
+ Viewport(Arc<ViewportRule>),
+ Keyframes(Arc<Locked<KeyframesRule>>),
+ Supports(Arc<SupportsRule>),
+ Page(Arc<Locked<PageRule>>),
+ Property(Arc<PropertyRule>),
+ Document(Arc<DocumentRule>),
+ LayerBlock(Arc<LayerBlockRule>),
+ LayerStatement(Arc<LayerStatementRule>),
+}
+
+impl CssRule {
+ /// Measure heap usage.
+ #[cfg(feature = "gecko")]
+ fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
+ match *self {
+ // Not all fields are currently fully measured. Extra measurement
+ // may be added later.
+ CssRule::Namespace(_) => 0,
+
+ // We don't need to measure ImportRule::stylesheet because we measure
+ // it on the C++ side in the child list of the ServoStyleSheet.
+ CssRule::Import(_) => 0,
+
+ CssRule::Style(ref lock) => {
+ lock.unconditional_shallow_size_of(ops) + lock.read_with(guard).size_of(guard, ops)
+ },
+ CssRule::Media(ref arc) => {
+ arc.unconditional_shallow_size_of(ops) + arc.size_of(guard, ops)
+ },
+ CssRule::Container(ref arc) => {
+ arc.unconditional_shallow_size_of(ops) + arc.size_of(guard, ops)
+ },
+ CssRule::FontFace(_) => 0,
+ CssRule::FontFeatureValues(_) => 0,
+ CssRule::FontPaletteValues(_) => 0,
+ CssRule::CounterStyle(_) => 0,
+ CssRule::Viewport(_) => 0,
+ CssRule::Keyframes(_) => 0,
+ CssRule::Supports(ref arc) => {
+ arc.unconditional_shallow_size_of(ops) + arc.size_of(guard, ops)
+ },
+ CssRule::Page(ref lock) => {
+ lock.unconditional_shallow_size_of(ops) + lock.read_with(guard).size_of(guard, ops)
+ },
+ CssRule::Property(ref rule) => {
+ rule.unconditional_shallow_size_of(ops) + rule.size_of(guard, ops)
+ },
+ CssRule::Document(ref arc) => {
+ arc.unconditional_shallow_size_of(ops) + arc.size_of(guard, ops)
+ },
+ // TODO(emilio): Add memory reporting for these rules.
+ CssRule::LayerBlock(_) | CssRule::LayerStatement(_) => 0,
+ }
+ }
+}
+
+/// https://drafts.csswg.org/cssom-1/#dom-cssrule-type
+#[allow(missing_docs)]
+#[derive(Clone, Copy, Debug, Eq, FromPrimitive, PartialEq)]
+#[repr(u8)]
+pub enum CssRuleType {
+ // https://drafts.csswg.org/cssom/#the-cssrule-interface
+ Style = 1,
+ // Charset = 2, // Historical
+ Import = 3,
+ Media = 4,
+ FontFace = 5,
+ Page = 6,
+ // https://drafts.csswg.org/css-animations-1/#interface-cssrule-idl
+ Keyframes = 7,
+ Keyframe = 8,
+ // https://drafts.csswg.org/cssom/#the-cssrule-interface
+ // Margin = 9, // Not implemented yet.
+ Namespace = 10,
+ // https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+ CounterStyle = 11,
+ // https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+ Supports = 12,
+ // https://www.w3.org/TR/2012/WD-css3-conditional-20120911/#extentions-to-cssrule-interface
+ Document = 13,
+ // https://drafts.csswg.org/css-fonts/#om-fontfeaturevalues
+ FontFeatureValues = 14,
+ // https://drafts.csswg.org/css-device-adapt/#css-rule-interface
+ Viewport = 15,
+ // After viewport, all rules should return 0 from the API, but we still need
+ // a constant somewhere.
+ LayerBlock = 16,
+ LayerStatement = 17,
+ Container = 18,
+ FontPaletteValues = 19,
+ // 20 is an arbitrary number to use for Property.
+ Property = 20,
+}
+
+impl CssRuleType {
+ /// Returns a bit that identifies this rule type.
+ #[inline]
+ pub const fn bit(self) -> u32 {
+ 1 << self as u32
+ }
+}
+
+/// Set of rule types.
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
+pub struct CssRuleTypes(u32);
+
+impl From<CssRuleType> for CssRuleTypes {
+ fn from(ty: CssRuleType) -> Self {
+ Self(ty.bit())
+ }
+}
+
+impl CssRuleTypes {
+ /// Returns whether the rule is in the current set.
+ #[inline]
+ pub fn contains(self, ty: CssRuleType) -> bool {
+ self.0 & ty.bit() != 0
+ }
+
+ /// Returns all the rules specified in the set.
+ pub fn bits(self) -> u32 {
+ self.0
+ }
+
+ /// Inserts a rule type into the set.
+ #[inline]
+ pub fn insert(&mut self, ty: CssRuleType) {
+ self.0 |= ty.bit()
+ }
+}
+
+#[allow(missing_docs)]
+pub enum RulesMutateError {
+ Syntax,
+ IndexSize,
+ HierarchyRequest,
+ InvalidState,
+}
+
+impl CssRule {
+ /// Returns the CSSOM rule type of this rule.
+ pub fn rule_type(&self) -> CssRuleType {
+ match *self {
+ CssRule::Style(_) => CssRuleType::Style,
+ CssRule::Import(_) => CssRuleType::Import,
+ CssRule::Media(_) => CssRuleType::Media,
+ CssRule::FontFace(_) => CssRuleType::FontFace,
+ CssRule::FontFeatureValues(_) => CssRuleType::FontFeatureValues,
+ CssRule::FontPaletteValues(_) => CssRuleType::FontPaletteValues,
+ CssRule::CounterStyle(_) => CssRuleType::CounterStyle,
+ CssRule::Keyframes(_) => CssRuleType::Keyframes,
+ CssRule::Namespace(_) => CssRuleType::Namespace,
+ CssRule::Viewport(_) => CssRuleType::Viewport,
+ CssRule::Supports(_) => CssRuleType::Supports,
+ CssRule::Page(_) => CssRuleType::Page,
+ CssRule::Property(_) => CssRuleType::Property,
+ CssRule::Document(_) => CssRuleType::Document,
+ CssRule::LayerBlock(_) => CssRuleType::LayerBlock,
+ CssRule::LayerStatement(_) => CssRuleType::LayerStatement,
+ CssRule::Container(_) => CssRuleType::Container,
+ }
+ }
+
+ /// Parse a CSS rule.
+ ///
+ /// Returns a parsed CSS rule and the final state of the parser.
+ ///
+ /// Input state is None for a nested rule
+ pub fn parse(
+ css: &str,
+ insert_rule_context: InsertRuleContext,
+ parent_stylesheet_contents: &StylesheetContents,
+ shared_lock: &SharedRwLock,
+ state: State,
+ loader: Option<&dyn StylesheetLoader>,
+ allow_import_rules: AllowImportRules,
+ ) -> Result<Self, RulesMutateError> {
+ let url_data = parent_stylesheet_contents.url_data.read();
+ let namespaces = parent_stylesheet_contents.namespaces.read();
+ let context = ParserContext::new(
+ parent_stylesheet_contents.origin,
+ &url_data,
+ None,
+ ParsingMode::DEFAULT,
+ parent_stylesheet_contents.quirks_mode,
+ Cow::Borrowed(&*namespaces),
+ None,
+ None,
+ );
+
+ let mut input = ParserInput::new(css);
+ let mut input = Parser::new(&mut input);
+
+ // nested rules are in the body state
+ let mut rule_parser = TopLevelRuleParser {
+ context,
+ shared_lock: &shared_lock,
+ loader,
+ state,
+ dom_error: None,
+ insert_rule_context: Some(insert_rule_context),
+ allow_import_rules,
+ declaration_parser_state: Default::default(),
+ rules: Default::default(),
+ };
+
+ match parse_one_rule(&mut input, &mut rule_parser) {
+ Ok(_) => Ok(rule_parser.rules.pop().unwrap()),
+ Err(_) => Err(rule_parser.dom_error.unwrap_or(RulesMutateError::Syntax)),
+ }
+ }
+}
+
+impl DeepCloneWithLock for CssRule {
+ /// Deep clones this CssRule.
+ fn deep_clone_with_lock(
+ &self,
+ lock: &SharedRwLock,
+ guard: &SharedRwLockReadGuard,
+ params: &DeepCloneParams,
+ ) -> CssRule {
+ match *self {
+ CssRule::Namespace(ref arc) => CssRule::Namespace(arc.clone()),
+ CssRule::Import(ref arc) => {
+ let rule = arc
+ .read_with(guard)
+ .deep_clone_with_lock(lock, guard, params);
+ CssRule::Import(Arc::new(lock.wrap(rule)))
+ },
+ CssRule::Style(ref arc) => {
+ let rule = arc.read_with(guard);
+ CssRule::Style(Arc::new(
+ lock.wrap(rule.deep_clone_with_lock(lock, guard, params)),
+ ))
+ },
+ CssRule::Container(ref arc) => {
+ CssRule::Container(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
+ },
+ CssRule::Media(ref arc) => {
+ CssRule::Media(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
+ },
+ CssRule::FontFace(ref arc) => {
+ let rule = arc.read_with(guard);
+ CssRule::FontFace(Arc::new(lock.wrap(rule.clone())))
+ },
+ CssRule::FontFeatureValues(ref arc) => CssRule::FontFeatureValues(arc.clone()),
+ CssRule::FontPaletteValues(ref arc) => CssRule::FontPaletteValues(arc.clone()),
+ CssRule::CounterStyle(ref arc) => {
+ let rule = arc.read_with(guard);
+ CssRule::CounterStyle(Arc::new(lock.wrap(rule.clone())))
+ },
+ CssRule::Viewport(ref arc) => CssRule::Viewport(arc.clone()),
+ CssRule::Keyframes(ref arc) => {
+ let rule = arc.read_with(guard);
+ CssRule::Keyframes(Arc::new(
+ lock.wrap(rule.deep_clone_with_lock(lock, guard, params)),
+ ))
+ },
+ CssRule::Supports(ref arc) => {
+ CssRule::Supports(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
+ },
+ CssRule::Page(ref arc) => {
+ let rule = arc.read_with(guard);
+ CssRule::Page(Arc::new(
+ lock.wrap(rule.deep_clone_with_lock(lock, guard, params)),
+ ))
+ },
+ CssRule::Property(ref arc) => {
+ // @property rules are immutable, so we don't need any of the `Locked`
+ // shenanigans, actually, and can just share the rule.
+ CssRule::Property(arc.clone())
+ },
+ CssRule::Document(ref arc) => {
+ CssRule::Document(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
+ },
+ CssRule::LayerStatement(ref arc) => CssRule::LayerStatement(arc.clone()),
+ CssRule::LayerBlock(ref arc) => {
+ CssRule::LayerBlock(Arc::new(arc.deep_clone_with_lock(lock, guard, params)))
+ },
+ }
+ }
+}
+
+impl ToCssWithGuard for CssRule {
+ // https://drafts.csswg.org/cssom/#serialize-a-css-rule
+ fn to_css(&self, guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
+ match *self {
+ CssRule::Namespace(ref rule) => rule.to_css(guard, dest),
+ CssRule::Import(ref lock) => lock.read_with(guard).to_css(guard, dest),
+ CssRule::Style(ref lock) => lock.read_with(guard).to_css(guard, dest),
+ CssRule::FontFace(ref lock) => lock.read_with(guard).to_css(guard, dest),
+ CssRule::FontFeatureValues(ref rule) => rule.to_css(guard, dest),
+ CssRule::FontPaletteValues(ref rule) => rule.to_css(guard, dest),
+ CssRule::CounterStyle(ref lock) => lock.read_with(guard).to_css(guard, dest),
+ CssRule::Viewport(ref rule) => rule.to_css(guard, dest),
+ CssRule::Keyframes(ref lock) => lock.read_with(guard).to_css(guard, dest),
+ CssRule::Media(ref rule) => rule.to_css(guard, dest),
+ CssRule::Supports(ref rule) => rule.to_css(guard, dest),
+ CssRule::Page(ref lock) => lock.read_with(guard).to_css(guard, dest),
+ CssRule::Property(ref rule) => rule.to_css(guard, dest),
+ CssRule::Document(ref rule) => rule.to_css(guard, dest),
+ CssRule::LayerBlock(ref rule) => rule.to_css(guard, dest),
+ CssRule::LayerStatement(ref rule) => rule.to_css(guard, dest),
+ CssRule::Container(ref rule) => rule.to_css(guard, dest),
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 08:44:42 +0000