Move gecko_bindings and gecko_string_cache into the style crate

components/style/gecko_string_cache/namespace.rs

@@ -0,0 +1,80 @@
+/* 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 string_cache::{Atom, WeakAtom};
+use gecko_bindings::structs::nsIAtom;
+use selectors::bloom::BloomHash;
+use std::borrow::Borrow;
+use std::fmt;
+use std::ops::Deref;
+
+#[macro_export]
+macro_rules! ns {
+    () => { $crate::string_cache::Namespace(atom!("")) }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Default, Hash)]
+pub struct Namespace(pub Atom);
+pub struct WeakNamespace(WeakAtom);
+
+impl Deref for Namespace {
+    type Target = WeakNamespace;
+
+    #[inline]
+    fn deref(&self) -> &WeakNamespace {
+        let weak: *const WeakAtom = &*self.0;
+        unsafe {
+            &*(weak as *const WeakNamespace)
+        }
+    }
+}
+
+impl fmt::Display for Namespace {
+    fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
+        self.0.fmt(w)
+    }
+}
+
+impl Borrow<WeakNamespace> for Namespace {
+    #[inline]
+    fn borrow(&self) -> &WeakNamespace {
+        self
+    }
+}
+
+impl WeakNamespace {
+    #[inline]
+    pub unsafe fn new<'a>(atom: *mut nsIAtom) -> &'a Self {
+        &*(atom as *const WeakNamespace)
+    }
+
+    #[inline]
+    pub fn clone(&self) -> Namespace {
+        Namespace(self.0.clone())
+    }
+}
+
+impl Eq for WeakNamespace {}
+impl PartialEq for WeakNamespace {
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        let weak: *const WeakNamespace = self;
+        let other: *const WeakNamespace = other;
+        weak == other
+    }
+}
+
+impl BloomHash for Namespace {
+    #[inline]
+    fn bloom_hash(&self) -> u32 {
+        self.0.get_hash()
+    }
+}
+
+impl BloomHash for WeakNamespace {
+    #[inline]
+    fn bloom_hash(&self) -> u32 {
+        self.0.get_hash()
+    }
+}