style: Move -x-lang outside of mako

components/style/values/specified/font.rs

@@ -4,7 +4,6 @@
 
 //! Specified values for font properties
 
-#[cfg(feature = "gecko")]
 use Atom;
 use app_units::Au;
 use byteorder::{BigEndian, ByteOrder};
@@ -1821,6 +1820,34 @@ impl ToCss for XTextZoom {
     }
 }
 
+#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToComputedValue)]
+/// Internal property that reflects the lang attribute
+pub struct XLang(pub Atom);
+
+impl XLang {
+    #[inline]
+    /// Get default value for `-x-lang`
+    pub fn get_initial_value() -> XLang {
+        XLang(atom!(""))
+    }
+}
+
+impl Parse for XLang {
+    fn parse<'i, 't>(
+        _: &ParserContext,
+        input: &mut Parser<'i, 't>
+    ) -> Result<XLang, ParseError<'i>> {
+        debug_assert!(false, "Should be set directly by presentation attributes only.");
+        Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
+    }
+}
+
+impl ToCss for XLang {
+    fn to_css<W>(&self, _: &mut W) -> fmt::Result where W: fmt::Write {
+        Ok(())
+    }
+}
+
 #[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
 #[derive(Clone, Debug, PartialEq, ToCss)]
 /// Specifies the minimum font size allowed due to changes in scriptlevel.