auto merge of #4594 : evilpie/servo/window-proxy, r=jdm

After this patch somebody just needs to implement the new IndexedGetter (and probably frames/length) on window to fix #4589.

components/script/dom/browsercontext.rs

@@ -2,14 +2,27 @@
  * 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::js::{JS, JSRef, Temporary};
+use dom::bindings::conversions::unwrap_jsmanaged;
+use dom::bindings::conversions::{ToJSValConvertible};
+use dom::bindings::js::{JS, JSRef, Temporary, Root};
+use dom::bindings::js::{OptionalRootable, OptionalRootedRootable, ResultRootable};
+use dom::bindings::js::{OptionalRootedReference, OptionalOptionalRootedRootable};
+use dom::bindings::proxyhandler::{getPropertyDescriptor, FillPropertyDescriptor};
 use dom::bindings::utils::{Reflectable, WindowProxyHandler};
+use dom::bindings::utils::{GetArrayIndexFromId};
 use dom::document::{Document, DocumentHelpers};
 use dom::window::Window;
+use dom::window::WindowHelpers;
 
-use js::jsapi::JSObject;
+use js::jsapi::{JSContext, JSObject, jsid, JSPropertyDescriptor};
+use js::jsapi::{JS_AlreadyHasOwnPropertyById, JS_ForwardGetPropertyTo};
+use js::jsapi::{JS_GetPropertyDescriptorById, JS_DefinePropertyById};
+use js::jsapi::{JS_SetPropertyById};
+use js::jsval::JSVal;
+use js::glue::{GetProxyPrivate};
 use js::glue::{WrapperNew, CreateWrapperProxyHandler, ProxyTraps};
 use js::rust::with_compartment;
+use js::{JSRESOLVE_QUALIFIED, JSRESOLVE_ASSIGNING};
 
 use std::ptr;
 
@@ -86,18 +99,112 @@ impl SessionHistoryEntry {
     }
 }
 
+unsafe fn GetSubframeWindow(cx: *mut JSContext, proxy: *mut JSObject, id: jsid) -> Option<Temporary<Window>> {
+    let index = GetArrayIndexFromId(cx, id);
+    if let Some(index) = index {
+        let target = GetProxyPrivate(proxy).to_object();
+        let win: Root<Window> = unwrap_jsmanaged(target).unwrap().root();
+        let mut found = false;
+        return win.r().IndexedGetter(index, &mut found);
+    }
+
+    None
+}
+
+unsafe extern fn getOwnPropertyDescriptor(cx: *mut JSContext, proxy: *mut JSObject, id: jsid, set: bool, desc: *mut JSPropertyDescriptor) -> bool {
+    let window = GetSubframeWindow(cx, proxy, id);
+    if let Some(window) = window {
+        let window = window.root();
+        (*desc).value = window.to_jsval(cx);
+        FillPropertyDescriptor(&mut *desc, proxy, true);
+        return true;
+    }
+
+    let target = GetProxyPrivate(proxy).to_object();
+    let flags = if set { JSRESOLVE_ASSIGNING } else { 0 } | JSRESOLVE_QUALIFIED;
+    // XXX This should be JS_GetOwnPropertyDescriptorById
+    if JS_GetPropertyDescriptorById(cx, target, id, flags, desc) == 0 {
+        return false;
+    }
+
+    if (*desc).obj != target {
+        // Not an own property
+        (*desc).obj = ptr::null_mut();
+    } else {
+        (*desc).obj = proxy;
+    }
+
+    true
+}
+
+
+unsafe extern fn defineProperty(cx: *mut JSContext, proxy: *mut JSObject, id: jsid, desc: *mut JSPropertyDescriptor) -> bool {
+    if GetArrayIndexFromId(cx, id).is_some() {
+        // Spec says to Reject whether this is a supported index or not,
+        // since we have no indexed setter or indexed creator.  That means
+        // throwing in strict mode (FIXME: Bug 828137), doing nothing in
+        // non-strict mode.
+        return true;
+    }
+
+    let target = GetProxyPrivate(proxy).to_object();
+    JS_DefinePropertyById(cx, target, id, (*desc).value, (*desc).getter,
+                          (*desc).setter, (*desc).attrs) != 0
+}
+
+unsafe extern fn hasOwn(cx: *mut JSContext, proxy: *mut JSObject, id: jsid, bp: *mut bool) -> bool {
+    let window = GetSubframeWindow(cx, proxy, id);
+    if window.is_some() {
+        *bp = true;
+        return true;
+    }
+
+    let target = GetProxyPrivate(proxy).to_object();
+    let mut found = 0;
+    if JS_AlreadyHasOwnPropertyById(cx, target, id, &mut found) == 0 {
+        return false;
+    }
+
+    *bp = found != 0;
+    return true;
+}
+
+unsafe extern fn get(cx: *mut JSContext, proxy: *mut JSObject, receiver: *mut JSObject, id: jsid, vp: *mut JSVal) -> bool {
+    let window = GetSubframeWindow(cx, proxy, id);
+    if let Some(window) = window {
+        let window = window.root();
+        *vp = window.to_jsval(cx);
+        return true;
+    }
+
+    let target = GetProxyPrivate(proxy).to_object();
+    JS_ForwardGetPropertyTo(cx, target, id, receiver, vp) != 0
+}
+
+unsafe extern fn set(cx: *mut JSContext, proxy: *mut JSObject, _receiver: *mut JSObject, id: jsid, _strict: bool, vp: *mut JSVal) -> bool {
+    if GetArrayIndexFromId(cx, id).is_some() {
+        // Reject (which means throw if and only if strict) the set.
+        // FIXME: Throw
+        return true;
+    }
+
+    // FIXME: The receiver should be used, we need something like JS_ForwardSetPropertyTo.
+    let target = GetProxyPrivate(proxy).to_object();
+    JS_SetPropertyById(cx, target, id, vp) != 0
+}
+
 static PROXY_HANDLER: ProxyTraps = ProxyTraps {
-    getPropertyDescriptor: None,
-    getOwnPropertyDescriptor: None,
-    defineProperty: None,
+    getPropertyDescriptor: Some(getPropertyDescriptor),
+    getOwnPropertyDescriptor: Some(getOwnPropertyDescriptor),
+    defineProperty: Some(defineProperty),
     getOwnPropertyNames: None,
     delete_: None,
     enumerate: None,
 
     has: None,
-    hasOwn: None,
-    get: None,
-    set: None,
+    hasOwn: Some(hasOwn),
+    get: Some(get),
+    set: Some(set),
     keys: None,
     iterate: None,
 

components/script/dom/window.rs

@@ -311,12 +311,12 @@ impl<'a> WindowMethods for JSRef<'a, Window> {
     }
 }
 
-
 pub trait WindowHelpers {
     fn flush_layout(self, goal: ReflowGoal, query: ReflowQueryType);
     fn init_browser_context(self, doc: JSRef<Document>);
     fn load_url(self, href: DOMString);
     fn handle_fire_timer(self, timer_id: TimerId);
+    fn IndexedGetter(self, _index: u32, _found: &mut bool) -> Option<Temporary<Window>>;
 }
 
 pub trait ScriptHelpers {
@@ -378,6 +378,11 @@ impl<'a> WindowHelpers for JSRef<'a, Window> {
         self.timers.fire_timer(timer_id, self);
         self.flush_layout(ReflowGoal::ForDisplay, ReflowQueryType::NoQuery);
     }
+
+    // https://html.spec.whatwg.org/multipage/browsers.html#accessing-other-browsing-contexts
+    fn IndexedGetter(self, _index: u32, _found: &mut bool) -> Option<Temporary<Window>> {
+        None
+    }
 }
 
 impl Window {

components/script/lib.rs

@@ -62,7 +62,7 @@ pub mod dom {
         pub mod callback;
         pub mod error;
         pub mod conversions;
-        mod proxyhandler;
+        pub mod proxyhandler;
         pub mod str;
         pub mod structuredclone;
         pub mod trace;

tests/content/test_windowproxy.html

@@ -0,0 +1,23 @@
+<html>
+<head id="foo">
+  <script src="harness.js"></script>
+</head>
+<body>
+<div></div>
+<script>
+  window.abcd = 15;
+  is(window.abcd, 15);
+  is(Object.getOwnPropertyDescriptor(window, 'abcd').value, 15);
+  is(window.hasOwnProperty('abcd'), true);
+
+  is('location' in window, true);
+  // FIXME: https://github.com/servo/servo/issues/4593
+  is(Object.hasOwnProperty('location'), false)
+
+  // Can't set indexed properties
+  window[100] = "abc";
+  is(window[100], undefined);
+  is(Object.getOwnPropertyDescriptor(window, 1000), undefined);
+</script>
+</body>
+</html>

tests/wpt/metadata/html/browsers/the-window-object/window-indexed-properties.html.ini

@@ -2,7 +2,3 @@
   type: testharness
   [Indexed properties of the window object (non-strict mode) 1]
     expected: FAIL
-
-  [Indexed properties of the window object (non-strict mode) 2]
-    expected: FAIL
-