Support value iterators in WebIDL interfaces.

components/script/dom/testbindingiterable.rs

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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 http://mozilla.org/MPL/2.0/. */
+
+// check-tidy: no specs after this line
+
+use dom::bindings::cell::DOMRefCell;
+use dom::bindings::codegen::Bindings::TestBindingIterableBinding::{self, TestBindingIterableMethods};
+use dom::bindings::error::Fallible;
+use dom::bindings::global::GlobalRef;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::bindings::str::DOMString;
+
+#[dom_struct]
+pub struct TestBindingIterable {
+    reflector: Reflector,
+    vals: DOMRefCell<Vec<DOMString>>,
+}
+
+impl TestBindingIterable {
+    fn new(global: GlobalRef) -> Root<TestBindingIterable> {
+        reflect_dom_object(box TestBindingIterable {
+            reflector: Reflector::new(),
+            vals: DOMRefCell::new(vec![]),
+        }, global, TestBindingIterableBinding::Wrap)
+    }
+
+    pub fn Constructor(global: GlobalRef) -> Fallible<Root<TestBindingIterable>> {
+        Ok(TestBindingIterable::new(global))
+    }
+}
+
+impl TestBindingIterableMethods for TestBindingIterable {
+    fn Add(&self, v: DOMString) { self.vals.borrow_mut().push(v); }
+    fn Length(&self) -> u32 { self.vals.borrow().len() as u32 }
+    fn GetItem(&self, n: u32) -> DOMString { self.vals.borrow().get(n as usize).unwrap().clone() }
+    fn IndexedGetter(&self, n: u32, found: &mut bool) -> DOMString {
+        let s = self.GetItem(n);
+        *found = true;
+        s
+    }
+}