script: Move CSS DOM interfaces to script/dom/css/ (#40241)

Moves interfaces defined by the CSS spec to the `script/dom/css/` module
from `script/dom/`.

Testing: Just a refactor shouldn't need any testing
Fixes: Partially #38901

Signed-off-by: WaterWhisperer <waterwhisperer24@qq.com>

components/script/dom/css/cssstylerule.rs

@@ -0,0 +1,170 @@
+/* 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/. */
+
+use std::cell::RefCell;
+use std::mem;
+
+use cssparser::{Parser as CssParser, ParserInput as CssParserInput, ToCss};
+use dom_struct::dom_struct;
+use selectors::parser::{ParseRelative, SelectorList};
+use servo_arc::Arc;
+use style::selector_parser::SelectorParser;
+use style::shared_lock::{Locked, SharedRwLockReadGuard, ToCssWithGuard};
+use style::stylesheets::{CssRuleType, CssRules, Origin, StyleRule, StylesheetInDocument};
+
+use super::cssgroupingrule::CSSGroupingRule;
+use super::cssrule::SpecificCSSRule;
+use super::cssstyledeclaration::{CSSModificationAccess, CSSStyleDeclaration, CSSStyleOwner};
+use super::cssstylesheet::CSSStyleSheet;
+use crate::dom::bindings::codegen::Bindings::CSSStyleRuleBinding::CSSStyleRuleMethods;
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::reflector::{DomGlobal, reflect_dom_object};
+use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
+use crate::dom::bindings::str::DOMString;
+use crate::dom::window::Window;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct CSSStyleRule {
+    cssgroupingrule: CSSGroupingRule,
+    #[ignore_malloc_size_of = "Stylo"]
+    #[no_trace]
+    stylerule: RefCell<Arc<Locked<StyleRule>>>,
+    style_decl: MutNullableDom<CSSStyleDeclaration>,
+}
+
+impl CSSStyleRule {
+    fn new_inherited(
+        parent_stylesheet: &CSSStyleSheet,
+        stylerule: Arc<Locked<StyleRule>>,
+    ) -> CSSStyleRule {
+        CSSStyleRule {
+            cssgroupingrule: CSSGroupingRule::new_inherited(parent_stylesheet),
+            stylerule: RefCell::new(stylerule),
+            style_decl: Default::default(),
+        }
+    }
+
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new(
+        window: &Window,
+        parent_stylesheet: &CSSStyleSheet,
+        stylerule: Arc<Locked<StyleRule>>,
+        can_gc: CanGc,
+    ) -> DomRoot<CSSStyleRule> {
+        reflect_dom_object(
+            Box::new(CSSStyleRule::new_inherited(parent_stylesheet, stylerule)),
+            window,
+            can_gc,
+        )
+    }
+
+    pub(crate) fn ensure_rules(&self) -> Arc<Locked<CssRules>> {
+        let lock = self.cssgroupingrule.shared_lock();
+        let mut guard = lock.write();
+        self.stylerule
+            .borrow()
+            .write_with(&mut guard)
+            .rules
+            .get_or_insert_with(|| CssRules::new(vec![], lock))
+            .clone()
+    }
+
+    pub(crate) fn update_rule(
+        &self,
+        stylerule: Arc<Locked<StyleRule>>,
+        guard: &SharedRwLockReadGuard,
+    ) {
+        if let Some(ref rules) = stylerule.read_with(guard).rules {
+            self.cssgroupingrule.update_rules(rules, guard);
+        }
+
+        if let Some(ref style_decl) = self.style_decl.get() {
+            style_decl.update_property_declaration_block(&stylerule.read_with(guard).block);
+        }
+
+        *self.stylerule.borrow_mut() = stylerule;
+    }
+}
+
+impl SpecificCSSRule for CSSStyleRule {
+    fn ty(&self) -> CssRuleType {
+        CssRuleType::Style
+    }
+
+    fn get_css(&self) -> DOMString {
+        let guard = self.cssgroupingrule.shared_lock().read();
+        self.stylerule
+            .borrow()
+            .read_with(&guard)
+            .to_css_string(&guard)
+            .into()
+    }
+}
+
+impl CSSStyleRuleMethods<crate::DomTypeHolder> for CSSStyleRule {
+    // https://drafts.csswg.org/cssom/#dom-cssstylerule-style
+    fn Style(&self, can_gc: CanGc) -> DomRoot<CSSStyleDeclaration> {
+        self.style_decl.or_init(|| {
+            let guard = self.cssgroupingrule.shared_lock().read();
+            CSSStyleDeclaration::new(
+                self.global().as_window(),
+                CSSStyleOwner::CSSRule(
+                    Dom::from_ref(self.upcast()),
+                    RefCell::new(self.stylerule.borrow().read_with(&guard).block.clone()),
+                ),
+                None,
+                CSSModificationAccess::ReadWrite,
+                can_gc,
+            )
+        })
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-cssstylerule-selectortext
+    fn SelectorText(&self) -> DOMString {
+        let guard = self.cssgroupingrule.shared_lock().read();
+        DOMString::from_string(
+            self.stylerule
+                .borrow()
+                .read_with(&guard)
+                .selectors
+                .to_css_string(),
+        )
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-cssstylerule-selectortext
+    fn SetSelectorText(&self, value: DOMString) {
+        let value = value.str();
+        let Ok(mut selector) = ({
+            let guard = self.cssgroupingrule.shared_lock().read();
+            let sheet = self.cssgroupingrule.parent_stylesheet().style_stylesheet();
+            let contents = sheet.contents(&guard);
+            // It's not clear from the spec if we should use the stylesheet's namespaces.
+            // https://github.com/w3c/csswg-drafts/issues/1511
+            let parser = SelectorParser {
+                stylesheet_origin: Origin::Author,
+                namespaces: &contents.namespaces,
+                url_data: &contents.url_data,
+                for_supports_rule: false,
+            };
+            let mut css_parser = CssParserInput::new(&value);
+            let mut css_parser = CssParser::new(&mut css_parser);
+            // TODO: Maybe allow setting relative selectors from the OM, if we're in a nested style
+            // rule?
+            SelectorList::parse(&parser, &mut css_parser, ParseRelative::No)
+        }) else {
+            return;
+        };
+        self.cssgroupingrule.parent_stylesheet().will_modify();
+        // This mirrors what we do in CSSStyleOwner::mutate_associated_block.
+        let mut guard = self.cssgroupingrule.shared_lock().write();
+        mem::swap(
+            &mut self.stylerule.borrow().write_with(&mut guard).selectors,
+            &mut selector,
+        );
+        self.cssgroupingrule
+            .parent_stylesheet()
+            .notify_invalidations();
+    }
+}