Add more APIs to work with AutoIdVector.

mozjs/js/rust/Cargo.toml

@@ -13,6 +13,8 @@ glob = "0.2.11"
 [[test]]
 name = "callback"
 [[test]]
+name = "enumerate"
+[[test]]
 name = "evaluate"
 [[test]]
 name = "stack_limit"

mozjs/js/rust/build.rs

@@ -191,6 +191,7 @@ const WHITELIST_VARS: &'static [&'static str] = &[
 const WHITELIST_FUNCTIONS: &'static [&'static str] = &[
     "JS::ContextOptionsRef",
     "JS::Evaluate",
+    "js::GetPropertyKeys",
     "JS::HeapObjectPostBarrier",
     "JS::HeapValuePostBarrier",
     "JS::InitSelfHostedCode",
@@ -219,6 +220,7 @@ const WHITELIST_FUNCTIONS: &'static [&'static str] = &[
     "JS_ReportErrorNumberUTF8",
     "JS_SetGCParameter",
     "JS_SetNativeStackQuota",
+    "JS_StringEqualsAscii",
     "JS_StringHasLatin1Chars",
     "JS_WrapValue",
     "JS::SetWarningReporter",

mozjs/js/rust/src/glue.rs

@@ -240,7 +240,10 @@ extern "C" {
     pub fn IsWrapper(obj: *mut JSObject) -> bool;
     pub fn UnwrapObject(obj: *mut JSObject, stopAtOuter: u8) -> *mut JSObject;
     pub fn UncheckedUnwrapObject(obj: *mut JSObject, stopAtOuter: u8) -> *mut JSObject;
+    pub fn CreateAutoIdVector(cx: *mut JSContext) -> *mut JS::AutoIdVector;
     pub fn AppendToAutoIdVector(v: *mut JS::AutoIdVector, id: jsid) -> bool;
+    pub fn SliceAutoIdVector(v: *const JS::AutoIdVector, length: *mut usize) -> *const jsid;
+    pub fn DestroyAutoIdVector(v: *mut JS::AutoIdVector);
     pub fn CreateAutoObjectVector(aCx: *mut JSContext)
      -> *mut JS::AutoObjectVector;
     pub fn AppendToAutoObjectVector(v: *mut JS::AutoObjectVector,

mozjs/js/rust/src/jsglue.cpp

@@ -660,12 +660,31 @@ UncheckedUnwrapObject(JSObject* obj, bool stopAtOuter)
     return js::UncheckedUnwrap(obj, stopAtOuter);
 }
 
+JS::AutoIdVector*
+CreateAutoIdVector(JSContext* cx)
+{
+    return new JS::AutoIdVector(cx);
+}
+
 bool
 AppendToAutoIdVector(JS::AutoIdVector* v, jsid id)
 {
     return v->append(id);
 }
 
+const jsid*
+SliceAutoIdVector(const JS::AutoIdVector* v, size_t* length)
+{
+    *length = v->length();
+    return v->begin();
+}
+
+void
+DestroyAutoIdVector(JS::AutoIdVector* v)
+{
+    delete v;
+}
+
 JS::AutoObjectVector*
 CreateAutoObjectVector(JSContext* aCx)
 {

mozjs/js/rust/src/rust.rs

@@ -19,6 +19,7 @@ use std::thread;
 use jsapi::root::*;
 use jsval;
 use glue::{CreateAutoObjectVector, CreateCallArgsFromVp, AppendToAutoObjectVector, DeleteAutoObjectVector, IsDebugBuild};
+use glue::{CreateAutoIdVector, SliceAutoIdVector, DestroyAutoIdVector};
 use glue::{NewCompileOptions, DeleteCompileOptions};
 
 const DEFAULT_HEAPSIZE: u32 = 32_u32 * 1024_u32 * 1024_u32;
@@ -839,6 +840,40 @@ impl JSNativeWrapper {
     }
 }
 
+pub struct IdVector(*mut JS::AutoIdVector);
+
+impl IdVector {
+    pub unsafe fn new(cx: *mut JSContext) -> IdVector {
+        let vector = CreateAutoIdVector(cx);
+        assert!(!vector.is_null());
+        IdVector(vector)
+    }
+
+    pub fn get(&self) -> *mut JS::AutoIdVector {
+        self.0
+    }
+}
+
+impl Drop for IdVector {
+    fn drop(&mut self) {
+        unsafe {
+            DestroyAutoIdVector(self.0)
+        }
+    }
+}
+
+impl Deref for IdVector {
+    type Target = [jsid];
+
+    fn deref(&self) -> &[jsid] {
+        unsafe {
+            let mut length = 0;
+            let pointer = SliceAutoIdVector(self.0 as *const _, &mut length);
+            slice::from_raw_parts(pointer, length)
+        }
+    }
+}
+
 /// Defines methods on `obj`. The last entry of `methods` must contain zeroed
 /// memory.
 ///

tests/enumerate.rs

@@ -0,0 +1,56 @@
+/* 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/. */
+
+#[macro_use]
+extern crate js;
+
+use js::glue::RUST_JSID_IS_STRING;
+use js::glue::RUST_JSID_TO_STRING;
+use js::jsapi::CompartmentOptions;
+use js::jsapi::GetPropertyKeys;
+use js::jsapi::JSITER_OWNONLY;
+use js::jsapi::JS_NewGlobalObject;
+use js::jsapi::JS_StringEqualsAscii;
+use js::jsapi::OnNewGlobalHookOption;
+use js::jsval::UndefinedValue;
+use js::rust::IdVector;
+use js::rust::Runtime;
+use js::rust::SIMPLE_GLOBAL_CLASS;
+use std::ptr;
+
+#[test]
+fn enumerate() {
+    let rt = Runtime::new();
+    let cx = rt.cx();
+
+    unsafe {
+        rooted!(in(cx) let global =
+            JS_NewGlobalObject(cx, &SIMPLE_GLOBAL_CLASS, ptr::null_mut(),
+                               OnNewGlobalHookOption::FireOnNewGlobalHook,
+                               &CompartmentOptions::default())
+        );
+
+        rooted!(in(cx) let mut rval = UndefinedValue());
+        assert!(rt.evaluate_script(global.handle(), "({ 'a': 7 })",
+                                   "test", 1, rval.handle_mut()).is_ok());
+        assert!(rval.is_object());
+
+        rooted!(in(cx) let object = rval.to_object());
+        let ids = IdVector::new(cx);
+        assert!(GetPropertyKeys(cx, object.handle(), JSITER_OWNONLY, ids.get()));
+
+        assert_eq!(ids.len(), 1);
+        rooted!(in(cx) let id = ids[0]);
+
+        assert!(RUST_JSID_IS_STRING(id.handle()));
+        rooted!(in(cx) let id = RUST_JSID_TO_STRING(id.handle()));
+
+        let mut matches = false;
+        assert!(JS_StringEqualsAscii(cx,
+                                     id.get(),
+                                     b"a\0" as *const _ as *const _,
+                                     &mut matches));
+        assert!(matches);
+    }
+}