Factor out a UrlOrNone value type and make -moz-binding use it.

MozReview-Commit-ID: L57QEf40e2m

components/style/properties/gecko.mako.rs

@@ -893,7 +893,7 @@ fn static_assert() {
 
     #[allow(non_snake_case)]
     pub fn set__moz_binding(&mut self, v: longhands::_moz_binding::computed_value::T) {
-        use properties::longhands::_moz_binding::SpecifiedValue as BindingValue;
+        use properties::longhands::_moz_binding::computed_value::T as BindingValue;
         match v {
             BindingValue::None => debug_assert!(self.gecko.mBinding.mRawPtr.is_null()),
             BindingValue::Url(ref url, ref extra_data) => {

components/style/properties/helpers.mako.rs

@@ -16,19 +16,24 @@
     </%call>
 </%def>
 
-<%def name="predefined_type(name, type, initial_value, parse_method='parse', **kwargs)">
+<%def name="predefined_type(name, type, initial_value, parse_method='parse', needs_context=False, **kwargs)">
     <%call expr="longhand(name, predefined_type=type, **kwargs)">
         #[allow(unused_imports)]
         use app_units::Au;
         use cssparser::{Color as CSSParserColor, RGBA};
-        pub type SpecifiedValue = specified::${type};
+        pub use values::specified::${type} as SpecifiedValue;
         pub mod computed_value {
             pub use values::computed::${type} as T;
         }
         #[inline] pub fn get_initial_value() -> computed_value::T { ${initial_value} }
-        #[inline] pub fn parse(_context: &ParserContext, input: &mut Parser)
+        #[allow(unused_variables)]
+        #[inline] pub fn parse(context: &ParserContext, input: &mut Parser)
                                -> Result<SpecifiedValue, ()> {
+            % if needs_context:
+            specified::${type}::${parse_method}(context, input)
+            % else:
             specified::${type}::${parse_method}(input)
+            % endif
         }
     </%call>
 </%def>

components/style/properties/longhand/box.mako.rs

@@ -920,64 +920,8 @@ ${helpers.single_keyword("-moz-appearance",
                          animatable=False)}
 
 // Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-binding
-<%helpers:longhand name="-moz-binding" products="gecko" animatable="False" disable_when_testing="True">
-    use cssparser::{CssStringWriter, ToCss};
-    use gecko_bindings::sugar::refptr::{GeckoArcPrincipal, GeckoArcURI};
-    use std::fmt::{self, Write};
-    use url::Url;
-    use values::specified::UrlExtraData;
-    use values::computed::ComputedValueAsSpecified;
-    use values::NoViewportPercentage;
-
-    #[derive(PartialEq, Clone, Debug)]
-    #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-    pub enum SpecifiedValue {
-        Url(Url, UrlExtraData),
-        None,
-    }
-
-    impl ComputedValueAsSpecified for SpecifiedValue {}
-    impl NoViewportPercentage for SpecifiedValue {}
-
-    impl ToCss for SpecifiedValue {
-        fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-            use values::LocalToCss;
-            match *self {
-                SpecifiedValue::Url(ref url, _) => {
-                    url.to_css(dest)
-                }
-                SpecifiedValue::None => {
-                    try!(dest.write_str("none"));
-                    Ok(())
-                }
-            }
-        }
-    }
-
-    pub mod computed_value {
-        pub type T = super::SpecifiedValue;
-    }
-
-    #[inline] pub fn get_initial_value() -> SpecifiedValue {
-        SpecifiedValue::None
-    }
-
-    pub fn parse(context: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue, ()> {
-        if input.try(|input| input.expect_ident_matching("none")).is_ok() {
-            return Ok(SpecifiedValue::None);
-        }
-
-        let url = context.parse_url(&*try!(input.expect_url()));
-        match UrlExtraData::make_from(context) {
-            Some(extra_data) => {
-                Ok(SpecifiedValue::Url(url, extra_data))
-            },
-            _ => {
-                // FIXME(heycam) should ensure we always have a principal, etc., when parsing
-                // style attributes and re-parsing due to CSS Variables.
-                println!("stylo: skipping -moz-binding declaration without ParserContextExtraData");
-                Err(())
-            },
-        }
-    }
-</%helpers:longhand>
+${helpers.predefined_type("-moz-binding", "UrlOrNone", "computed_value::T::None",
+                          needs_context=True,
+                          products="gecko",
+                          animatable="False",
+                          disable_when_testing="True")}

components/style/values/computed/mod.rs

@@ -13,7 +13,7 @@ use super::LocalToCss;
 pub use cssparser::Color as CSSColor;
 pub use self::image::{EndingShape as GradientShape, Gradient, GradientKind, Image};
 pub use self::image::{LengthOrKeyword, LengthOrPercentageOrKeyword};
-pub use super::specified::{Angle, BorderStyle, Time, UrlExtraData};
+pub use super::specified::{Angle, BorderStyle, Time, UrlExtraData, UrlOrNone};
 
 pub mod basic_shape;
 pub mod image;

components/style/values/specified/mod.rs

@@ -18,6 +18,7 @@ use std::ops::Mul;
 use style_traits::values::specified::AllowedNumericType;
 use super::{CSSFloat, FONT_MEDIUM_PX, HasViewportPercentage, LocalToCss, NoViewportPercentage};
 use super::computed::{self, ComputedValueAsSpecified, Context, ToComputedValue};
+use url::Url;
 
 pub use self::image::{AngleOrCorner, ColorStop, EndingShape as GradientEndingShape, Gradient};
 pub use self::image::{GradientKind, HorizontalDirection, Image, LengthOrKeyword, LengthOrPercentageOrKeyword};
@@ -1452,3 +1453,49 @@ impl ToCss for Opacity {
         self.0.to_css(dest)
     }
 }
+
+#[derive(PartialEq, Clone, Debug)]
+#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
+pub enum UrlOrNone {
+    Url(Url, UrlExtraData),
+    None,
+}
+
+impl ComputedValueAsSpecified for UrlOrNone {}
+impl NoViewportPercentage for UrlOrNone {}
+
+impl ToCss for UrlOrNone {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        use values::LocalToCss;
+        match *self {
+            UrlOrNone::Url(ref url, _) => {
+                url.to_css(dest)
+            }
+            UrlOrNone::None => {
+                try!(dest.write_str("none"));
+                Ok(())
+            }
+        }
+    }
+}
+
+impl UrlOrNone {
+    pub fn parse(context: &ParserContext, input: &mut Parser) -> Result<UrlOrNone, ()> {
+        if input.try(|input| input.expect_ident_matching("none")).is_ok() {
+            return Ok(UrlOrNone::None);
+        }
+
+        let url = context.parse_url(&*try!(input.expect_url()));
+        match UrlExtraData::make_from(context) {
+            Some(extra_data) => {
+                Ok(UrlOrNone::Url(url, extra_data))
+            },
+            _ => {
+                // FIXME(heycam) should ensure we always have a principal, etc., when parsing
+                // style attributes and re-parsing due to CSS Variables.
+                println!("stylo: skipping UrlOrNone declaration without ParserContextExtraData");
+                Err(())
+            },
+        }
+    }
+}