Implement MediaList interface

components/script/dom/medialist.rs

@@ -0,0 +1,122 @@
+/* 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 core::default::Default;
+use cssparser::Parser;
+use dom::bindings::codegen::Bindings::MediaListBinding;
+use dom::bindings::codegen::Bindings::MediaListBinding::MediaListMethods;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::bindings::str::DOMString;
+use dom::window::Window;
+use parking_lot::RwLock;
+use std::sync::Arc;
+use style::media_queries::{MediaQuery, parse_media_query_list};
+use style::media_queries::MediaList as StyleMediaList;
+use style_traits::ToCss;
+
+#[dom_struct]
+pub struct MediaList {
+    reflector_: Reflector,
+    #[ignore_heap_size_of = "Arc"]
+    media_queries: Arc<RwLock<StyleMediaList>>,
+}
+
+impl MediaList {
+    #[allow(unrooted_must_root)]
+    pub fn new_inherited(media_queries: Arc<RwLock<StyleMediaList>>) -> MediaList {
+        MediaList {
+            reflector_: Reflector::new(),
+            media_queries: media_queries,
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(window: &Window, media_queries: Arc<RwLock<StyleMediaList>>)
+        -> Root<MediaList> {
+        reflect_dom_object(box MediaList::new_inherited(media_queries),
+                           window,
+                           MediaListBinding::Wrap)
+    }
+
+}
+
+impl MediaListMethods for MediaList {
+    // https://drafts.csswg.org/cssom/#dom-medialist-mediatext
+    fn MediaText(&self) -> DOMString {
+        DOMString::from(self.media_queries.read().to_css_string())
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-medialist-mediatext
+    fn SetMediaText(&self, value: DOMString) {
+        let mut media_queries = self.media_queries.write();
+        // Step 2
+        if value.is_empty() {
+            // Step 1
+            *media_queries = StyleMediaList::default();
+            return;
+        }
+        // Step 3
+        let mut parser = Parser::new(&value);
+        *media_queries = parse_media_query_list(&mut parser);
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-medialist-length
+    fn Length(&self) -> u32 {
+        self.media_queries.read().media_queries.len() as u32
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-medialist-item
+    fn Item(&self, index: u32) -> Option<DOMString> {
+        self.media_queries.read().media_queries.get(index as usize)
+                                            .and_then(|query| {
+            let mut s = String::new();
+            query.to_css(&mut s).unwrap();
+            Some(DOMString::from_string(s))
+        })
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-medialist-item
+    fn IndexedGetter(&self, index: u32) -> Option<DOMString> {
+        self.Item(index)
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-medialist-appendmedium
+    fn AppendMedium(&self, medium: DOMString) {
+        // Step 1
+        let mut parser = Parser::new(&medium);
+        let m = MediaQuery::parse(&mut parser);
+        // Step 2
+        if let Err(_) = m {
+            return;
+        }
+        // Step 3
+        let m_serialized = m.clone().unwrap().to_css_string();
+        let any = self.media_queries.read().media_queries.iter()
+                                    .any(|q| m_serialized == q.to_css_string());
+        if any {
+            return;
+        }
+        // Step 4
+        self.media_queries.write().media_queries.push(m.unwrap());
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-medialist-deletemedium
+    fn DeleteMedium(&self, medium: DOMString) {
+        // Step 1
+        let mut parser = Parser::new(&medium);
+        let m = MediaQuery::parse(&mut parser);
+        // Step 2
+        if let Err(_) = m {
+            return;
+        }
+        // Step 3
+        let m_serialized = m.unwrap().to_css_string();
+        let mut media_list = self.media_queries.write();
+        let new_vec = media_list.media_queries.drain(..)
+                                .filter(|q| m_serialized != q.to_css_string())
+                                .collect();
+        media_list.media_queries = new_vec;
+    }
+}