1 files changed, 93 insertions, 0 deletions
diff --git a/components/macros/lib.rs b/components/macros/lib.rs
new file mode 100644
index 00000000000..20304ffe806
--- /dev/null
+++ b/components/macros/lib.rs
@@ -0,0 +1,93 @@
+/* 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/. */
+
+#![feature(macro_rules, plugin_registrar, quote, phase)]
+
+//! Exports macros for use in other Servo crates.
+
+#[cfg(test)]
+extern crate sync;
+
+
+#[macro_export]
+macro_rules! bitfield(
+    ($bitfieldname:ident, $getter:ident, $setter:ident, $value:expr) => (
+        impl $bitfieldname {
+            #[inline]
+            pub fn $getter(self) -> bool {
+                let $bitfieldname(this) = self;
+                (this & $value) != 0
+            }
+
+            #[inline]
+            pub fn $setter(&mut self, value: bool) {
+                let $bitfieldname(this) = *self;
+                *self = $bitfieldname((this & !$value) | (if value { $value } else { 0 }))
+            }
+        }
+    )
+)
+
+
+#[macro_export]
+macro_rules! lazy_init(
+    ($(static ref $N:ident : $T:ty = $e:expr;)*) => (
+        $(
+            #[allow(non_camel_case_types)]
+            struct $N {__unit__: ()}
+            static $N: $N = $N {__unit__: ()};
+            impl Deref<$T> for $N {
+                fn deref<'a>(&'a self) -> &'a $T {
+                    unsafe {
+                        static mut s: *const $T = 0 as *const $T;
+                        static mut ONCE: ::sync::one::Once = ::sync::one::ONCE_INIT;
+                        ONCE.doit(|| {
+                            s = ::std::mem::transmute::<Box<$T>, *const $T>(box () ($e));
+                        });
+                        &*s
+                    }
+                }
+            }
+
+        )*
+    )
+)
+
+
+#[cfg(test)]
+mod tests {
+    use std::collections::hashmap::HashMap;
+    lazy_init! {
+        static ref NUMBER: uint = times_two(3);
+        static ref VEC: [Box<uint>, ..3] = [box 1, box 2, box 3];
+        static ref OWNED_STRING: String = "hello".to_string();
+        static ref HASHMAP: HashMap<uint, &'static str> = {
+            let mut m = HashMap::new();
+            m.insert(0u, "abc");
+            m.insert(1, "def");
+            m.insert(2, "ghi");
+            m
+        };
+    }
+
+    fn times_two(n: uint) -> uint {
+        n * 2
+    }
+
+    #[test]
+    fn test_basic() {
+        assert_eq!(*OWNED_STRING, "hello".to_string());
+        assert_eq!(*NUMBER, 6);
+        assert!(HASHMAP.find(&1).is_some());
+        assert!(HASHMAP.find(&3).is_none());
+        assert_eq!(VEC.as_slice(), &[box 1, box 2, box 3]);
+    }
+
+    #[test]
+    fn test_repeat() {
+        assert_eq!(*NUMBER, 6);
+        assert_eq!(*NUMBER, 6);
+        assert_eq!(*NUMBER, 6);
+    }
+}