Implemented paint worklet properties.

components/script/dom/stylepropertymapreadonly.rs

@@ -0,0 +1,66 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+use dom::bindings::codegen::Bindings::StylePropertyMapReadOnlyBinding::StylePropertyMapReadOnlyMethods;
+use dom::bindings::codegen::Bindings::StylePropertyMapReadOnlyBinding::Wrap;
+use dom::bindings::js::JS;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::Reflector;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::bindings::str::DOMString;
+use dom::cssstylevalue::CSSStyleValue;
+use dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+use servo_atoms::Atom;
+use std::collections::HashMap;
+use std::iter::Iterator;
+
+#[dom_struct]
+pub struct StylePropertyMapReadOnly {
+    reflector: Reflector,
+    entries: HashMap<Atom, JS<CSSStyleValue>>,
+}
+
+impl StylePropertyMapReadOnly {
+    fn new_inherited<Entries>(entries: Entries) -> StylePropertyMapReadOnly where
+        Entries: IntoIterator<Item=(Atom, JS<CSSStyleValue>)>
+    {
+        StylePropertyMapReadOnly {
+            reflector: Reflector::new(),
+            entries: entries.into_iter().collect(),
+        }
+    }
+
+    pub fn from_iter<Entries>(global: &GlobalScope, entries: Entries) -> Root<StylePropertyMapReadOnly> where
+        Entries: IntoIterator<Item=(Atom, String)>,
+    {
+        let mut keys = Vec::new();
+        rooted_vec!(let mut values);
+        let iter = entries.into_iter();
+        let (lo, _) = iter.size_hint();
+        keys.reserve(lo);
+        values.reserve(lo);
+        for (key, value) in iter {
+            let value = CSSStyleValue::new(global, value);
+            keys.push(key);
+            values.push(JS::from_ref(&*value));
+        }
+        let iter = keys.drain(..).zip(values.iter().cloned());
+        reflect_dom_object(box StylePropertyMapReadOnly::new_inherited(iter), global, Wrap)
+    }
+}
+
+impl StylePropertyMapReadOnlyMethods for StylePropertyMapReadOnly {
+    /// https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymapreadonly-get
+    fn Get(&self, property: DOMString) -> Option<Root<CSSStyleValue>> {
+        // TODO: avoid constructing an Atom
+        self.entries.get(&Atom::from(property)).map(|value| Root::from_ref(&**value))
+    }
+
+    /// https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymapreadonly-has
+    fn Has(&self, property: DOMString) -> bool {
+        // TODO: avoid constructing an Atom
+        self.entries.contains_key(&Atom::from(property))
+    }
+}