Support Namespace const in webidl (#30492)

* Add TestNS with const

* Implement namespace const in codegen

components/script/dom/bindings/codegen/CodegenRust.py

@@ -3281,19 +3281,24 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
                 methods = self.properties.static_methods.variableName()
             else:
                 methods = "&[]"
-            return CGGeneric("""\
-rooted!(in(*cx) let proto = %(proto)s);
+            if self.descriptor.interface.hasConstants():
+                constants = "sConstants"
+            else:
+                constants = "&[]"
+            id = MakeNativeName(name)
+            return CGGeneric(f"""\
+rooted!(in(*cx) let proto = {proto});
 assert!(!proto.is_null());
 rooted!(in(*cx) let mut namespace = ptr::null_mut::<JSObject>());
 create_namespace_object(cx, global, proto.handle(), &NAMESPACE_OBJECT_CLASS,
-                        %(methods)s, %(name)s, namespace.handle_mut());
+                        {methods}, {constants}, {str_to_const_array(name)}, namespace.handle_mut());
 assert!(!namespace.is_null());
-assert!((*cache)[PrototypeList::Constructor::%(id)s as usize].is_null());
-(*cache)[PrototypeList::Constructor::%(id)s as usize] = namespace.get();
-<*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::Constructor::%(id)s as isize),
+assert!((*cache)[PrototypeList::Constructor::{id} as usize].is_null());
+(*cache)[PrototypeList::Constructor::{id} as usize] = namespace.get();
+<*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::Constructor::{id} as isize),
                               ptr::null_mut(),
                               namespace.get());
-""" % {"id": MakeNativeName(name), "methods": methods, "name": str_to_const_array(name), "proto": proto})
+""")
         if self.descriptor.interface.isCallback():
             assert not self.descriptor.interface.ctor() and self.descriptor.interface.hasConstants()
             return CGGeneric("""\

components/script/dom/bindings/namespace.rs

@@ -9,6 +9,7 @@ use std::ptr;
 use js::jsapi::{JSClass, JSFunctionSpec};
 use js::rust::{HandleObject, MutableHandleObject};
 
+use super::constant::ConstantSpec;
 use crate::dom::bindings::guard::Guard;
 use crate::dom::bindings::interface::{create_object, define_on_global_object};
 use crate::script_runtime::JSContext;
@@ -40,9 +41,10 @@ pub fn create_namespace_object(
     proto: HandleObject,
     class: &'static NamespaceObjectClass,
     methods: &[Guard<&'static [JSFunctionSpec]>],
+    constants: &[Guard<&'static [ConstantSpec]>],
     name: &[u8],
     rval: MutableHandleObject,
 ) {
-    create_object(cx, global, proto, &class.0, methods, &[], &[], rval);
+    create_object(cx, global, proto, &class.0, methods, &[], constants, rval);
     define_on_global_object(cx, global, name, rval.handle());
 }

components/script/dom/mod.rs

@@ -537,6 +537,7 @@ pub mod testbindingmaplike;
 pub mod testbindingpairiterable;
 pub mod testbindingproxy;
 pub mod testbindingsetlike;
+pub mod testns;
 pub mod testrunner;
 pub mod testworklet;
 pub mod testworkletglobalscope;

components/script/dom/testns.rs

@@ -0,0 +1,7 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+// check-tidy: no specs after this line
+
+pub struct TestNS(());

components/script/dom/webidls/TestBinding.webidl

@@ -599,3 +599,9 @@ partial interface TestBinding {
   [Pref="dom.testable_crash.enabled"]
   undefined crashHard();
 };
+
+[Exposed=(Window,Worker), Pref="dom.testbinding.enabled"]
+namespace TestNS {
+    const unsigned long ONE   = 1;
+    const unsigned long TWO   = 0x2;
+};