implement NodeList and consolidate common scope and context retrieval

src/components/script/dom/nodelist.rs

@@ -0,0 +1,91 @@
+/* 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::NodeListBinding;
+use dom::bindings::utils::{Reflectable, BindingObject, Reflector};
+use dom::node::{AbstractNode, ScriptView};
+use script_task::page_from_context;
+
+use js::jsapi::{JSObject, JSContext};
+
+enum NodeListType {
+    Simple(~[AbstractNode<ScriptView>]),
+    Children(AbstractNode<ScriptView>)
+}
+
+pub struct NodeList {
+    list_type: NodeListType,
+    reflector_: Reflector
+}
+
+impl NodeList {
+    pub fn new_simple_list(elements: ~[AbstractNode<ScriptView>], cx: *JSContext, scope: *JSObject) -> @mut NodeList {
+        let list = @mut NodeList {
+            list_type: Simple(elements),
+            reflector_: Reflector::new()
+        };
+
+        list.init_wrapper(cx, scope);
+        list
+    }
+
+    pub fn new_child_list(node: AbstractNode<ScriptView>, cx: *JSContext, scope: *JSObject) -> @mut NodeList {
+        let list = @mut NodeList {
+            list_type: Children(node),
+            reflector_: Reflector::new()
+        };
+
+        list.init_wrapper(cx, scope);
+        list
+    }
+
+    fn init_wrapper(@mut self, cx: *JSContext, scope: *JSObject) {
+        self.wrap_object_shared(cx, scope);
+    }
+
+    pub fn Length(&self) -> u32 {
+        match self.list_type {
+            Simple(ref elems) => elems.len() as u32,
+            Children(ref node) => node.children().len() as u32
+        }
+    }
+
+    pub fn Item(&self, index: u32) -> Option<AbstractNode<ScriptView>> {
+        match self.list_type {
+            _ if index >= self.Length() => None,
+            Simple(ref elems) => Some(elems[index]),
+            Children(ref node) => node.children().nth(index as uint)
+        }
+    }
+
+    pub fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<AbstractNode<ScriptView>> {
+        let item = self.Item(index);
+        *found = item.is_some();
+        item
+    }
+}
+
+impl BindingObject for NodeList {
+    fn GetParentObject(&self, cx: *JSContext) -> Option<@mut Reflectable> {
+        let page = page_from_context(cx);
+        unsafe {
+            Some((*page).frame.get_ref().window as @mut Reflectable)
+        }
+    }
+}
+
+impl Reflectable for NodeList {
+    fn reflector<'a>(&'a self) -> &'a Reflector {
+        &self.reflector_
+    }
+
+    fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
+        &mut self.reflector_
+    }
+
+    fn wrap_object_shared(@mut self, cx: *JSContext, scope: *JSObject) -> *JSObject {
+        let mut unused = false;
+        NodeListBinding::Wrap(cx, scope, self, &mut unused)
+    }
+}