Make KeywordInfo generic

components/style/properties/gecko.mako.rs

@@ -2389,7 +2389,7 @@ fn static_assert() {
     }
 
     pub fn set_font_size(&mut self, v: FontSize) {
-        use values::specified::font::KeywordSize;
+        use values::generics::font::KeywordSize;
         self.gecko.mSize = v.size().0;
         self.gecko.mScriptUnconstrainedSize = v.size().0;
         if let Some(info) = v.keyword_info {
@@ -2601,8 +2601,7 @@ fn static_assert() {
     }
 
     pub fn clone_font_size(&self) -> FontSize {
-        use values::computed::font::KeywordInfo;
-        use values::specified::font::KeywordSize;
+        use values::generics::font::{KeywordInfo, KeywordSize};
         let size = Au(self.gecko.mSize).into();
         let kw = match self.gecko.mFontSizeKeyword as u32 {
             structs::NS_STYLE_FONT_SIZE_XXSMALL => KeywordSize::XXSmall,

components/style/values/computed/font.rs

@@ -23,7 +23,8 @@ use style_traits::{CssWriter, ParseError, ToCss};
 use values::CSSFloat;
 use values::animated::{ToAnimatedValue, ToAnimatedZero};
 use values::computed::{Context, NonNegativeLength, ToComputedValue, Integer, Number};
-use values::generics::font::{FontSettings, FeatureTagValue, VariationValue};
+use values::generics::font::{FontSettings, FeatureTagValue};
+use values::generics::font::{KeywordInfo as GenericKeywordInfo, VariationValue};
 use values::specified::font as specified;
 use values::specified::length::{FontBaseSize, NoCalcLength};
 
@@ -49,50 +50,8 @@ pub struct FontSize {
     pub keyword_info: Option<KeywordInfo>,
 }
 
-#[derive(Animate, ComputeSquaredDistance, MallocSizeOf, ToAnimatedValue, ToAnimatedZero)]
-#[derive(Clone, Copy, Debug, PartialEq)]
-/// Additional information for keyword-derived font sizes.
-pub struct KeywordInfo {
-    /// The keyword used
-    pub kw: specified::KeywordSize,
-    /// A factor to be multiplied by the computed size of the keyword
-    pub factor: f32,
-    /// An additional Au offset to add to the kw*factor in the case of calcs
-    pub offset: NonNegativeLength,
-}
-
-impl KeywordInfo {
-    /// Computes the final size for this font-size keyword, accounting for
-    /// text-zoom.
-    pub fn to_computed_value(&self, context: &Context) -> NonNegativeLength {
-        let base = context.maybe_zoom_text(self.kw.to_computed_value(context));
-        base.scale_by(self.factor) + context.maybe_zoom_text(self.offset)
-    }
-
-    /// Given a parent keyword info (self), apply an additional factor/offset to it
-    pub fn compose(self, factor: f32, offset: NonNegativeLength) -> Self {
-        KeywordInfo {
-            kw: self.kw,
-            factor: self.factor * factor,
-            offset: self.offset.scale_by(factor) + offset,
-        }
-    }
-
-    /// KeywordInfo value for font-size: medium
-    pub fn medium() -> Self {
-        specified::KeywordSize::Medium.into()
-    }
-}
-
-impl From<specified::KeywordSize> for KeywordInfo {
-    fn from(x: specified::KeywordSize) -> Self {
-        KeywordInfo {
-            kw: x,
-            factor: 1.,
-            offset: Au(0).into(),
-        }
-    }
-}
+/// Additional information for computed keyword-derived font sizes.
+pub type KeywordInfo = GenericKeywordInfo<NonNegativeLength>;
 
 impl FontWeight {
     /// Value for normal

components/style/values/generics/font.rs

@@ -4,6 +4,7 @@
 
 //! Generic types for font stuff.
 
+use app_units::Au;
 use byteorder::{ReadBytesExt, BigEndian};
 use cssparser::Parser;
 use num_traits::One;
@@ -159,3 +160,103 @@ impl Parse for FontTag {
         Ok(FontTag(raw.read_u32::<BigEndian>().unwrap()))
     }
 }
+
+#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf)]
+#[derive(PartialEq, ToAnimatedValue, ToAnimatedZero)]
+/// Additional information for keyword-derived font sizes.
+pub struct KeywordInfo<Length> {
+    /// The keyword used
+    pub kw: KeywordSize,
+    /// A factor to be multiplied by the computed size of the keyword
+    pub factor: f32,
+    /// An additional Au offset to add to the kw*factor in the case of calcs
+    pub offset: Length,
+}
+
+impl<L> KeywordInfo<L>
+where
+    Au: Into<L>,
+{
+    /// KeywordInfo value for font-size: medium
+    pub fn medium() -> Self {
+        KeywordSize::Medium.into()
+    }
+}
+
+impl<L> From<KeywordSize> for KeywordInfo<L>
+where
+    Au: Into<L>,
+{
+    fn from(x: KeywordSize) -> Self {
+        KeywordInfo {
+            kw: x,
+            factor: 1.,
+            offset: Au(0).into(),
+        }
+    }
+}
+
+/// CSS font keywords
+#[derive(Animate, ComputeSquaredDistance, MallocSizeOf, ToAnimatedValue, ToAnimatedZero)]
+#[derive(Clone, Copy, Debug, PartialEq)]
+#[allow(missing_docs)]
+pub enum KeywordSize {
+    XXSmall = 1, // This is to enable the NonZero optimization
+                 // which simplifies the representation of Option<KeywordSize>
+                 // in bindgen
+    XSmall,
+    Small,
+    Medium,
+    Large,
+    XLarge,
+    XXLarge,
+    // This is not a real font keyword and will not parse
+    // HTML font-size 7 corresponds to this value
+    XXXLarge,
+}
+
+impl KeywordSize {
+    /// Convert to an HTML <font size> value
+    pub fn html_size(&self) -> u8 {
+        match *self {
+            KeywordSize::XXSmall => 0,
+            KeywordSize::XSmall => 1,
+            KeywordSize::Small => 2,
+            KeywordSize::Medium => 3,
+            KeywordSize::Large => 4,
+            KeywordSize::XLarge => 5,
+            KeywordSize::XXLarge => 6,
+            KeywordSize::XXXLarge => 7,
+        }
+    }
+}
+
+impl Default for KeywordSize {
+    fn default() -> Self {
+        KeywordSize::Medium
+    }
+}
+
+impl ToCss for KeywordSize {
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        dest.write_str(match *self {
+            KeywordSize::XXSmall => "xx-small",
+            KeywordSize::XSmall => "x-small",
+            KeywordSize::Small => "small",
+            KeywordSize::Medium => "medium",
+            KeywordSize::Large => "large",
+            KeywordSize::XLarge => "x-large",
+            KeywordSize::XXLarge => "xx-large",
+            KeywordSize::XXXLarge => {
+                debug_assert!(
+                    false,
+                    "We should never serialize specified values set via HTML presentation attributes"
+                );
+                "-servo-xxx-large"
+            },
+        })
+    }
+}

components/style/values/specified/font.rs

@@ -21,7 +21,8 @@ use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
 use values::CustomIdent;
 use values::computed::{font as computed, Context, Length, NonNegativeLength, ToComputedValue};
 use values::computed::font::{SingleFontFamily, FontFamilyList, FamilyName};
-use values::generics::font::{FontSettings, FeatureTagValue, FontTag, VariationValue};
+use values::generics::font::{FontSettings, FontTag, FeatureTagValue};
+use values::generics::font::{KeywordInfo as GenericKeywordInfo, KeywordSize, VariationValue};
 use values::specified::{AllowQuirks, Integer, LengthOrPercentage, NoCalcLength, Number};
 use values::specified::length::{AU_PER_PT, AU_PER_PX, FontBaseSize};
 
@@ -134,7 +135,7 @@ pub enum FontSize {
     /// go into the ratio, and the remaining units all computed together
     /// will go into the offset.
     /// See bug 1355707.
-    Keyword(computed::KeywordInfo),
+    Keyword(KeywordInfo),
     /// font-size: smaller
     Smaller,
     /// font-size: larger
@@ -340,27 +341,29 @@ impl Parse for FontSizeAdjust {
     }
 }
 
-/// CSS font keywords
-#[derive(Animate, ComputeSquaredDistance, MallocSizeOf, ToAnimatedValue, ToAnimatedZero)]
-#[derive(Clone, Copy, Debug, PartialEq)]
-#[allow(missing_docs)]
-pub enum KeywordSize {
-    XXSmall = 1, // This is to enable the NonZero optimization
-                 // which simplifies the representation of Option<KeywordSize>
-                 // in bindgen
-    XSmall,
-    Small,
-    Medium,
-    Large,
-    XLarge,
-    XXLarge,
-    // This is not a real font keyword and will not parse
-    // HTML font-size 7 corresponds to this value
-    XXXLarge,
+/// Additional information for specified keyword-derived font sizes.
+pub type KeywordInfo = GenericKeywordInfo<NonNegativeLength>;
+
+impl KeywordInfo {
+    /// Computes the final size for this font-size keyword, accounting for
+    /// text-zoom.
+    pub fn to_computed_value(&self, context: &Context) -> NonNegativeLength {
+        let base = context.maybe_zoom_text(self.kw.to_computed_value(context));
+        base.scale_by(self.factor) + context.maybe_zoom_text(self.offset)
+    }
+
+    /// Given a parent keyword info (self), apply an additional factor/offset to it
+    pub fn compose(self, factor: f32, offset: NonNegativeLength) -> Self {
+        KeywordInfo {
+            kw: self.kw,
+            factor: self.factor * factor,
+            offset: self.offset.scale_by(factor) + offset,
+        }
+    }
 }
 
 impl KeywordSize {
-    /// Parse a keyword size
+    /// Parses a keyword size.
     pub fn parse<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
         try_match_ident_ignore_ascii_case! { input,
             "xx-small" => Ok(KeywordSize::XXSmall),
@@ -372,46 +375,6 @@ impl KeywordSize {
             "xx-large" => Ok(KeywordSize::XXLarge),
         }
     }
-
-    /// Convert to an HTML <font size> value
-    pub fn html_size(&self) -> u8 {
-        match *self {
-            KeywordSize::XXSmall => 0,
-            KeywordSize::XSmall => 1,
-            KeywordSize::Small => 2,
-            KeywordSize::Medium => 3,
-            KeywordSize::Large => 4,
-            KeywordSize::XLarge => 5,
-            KeywordSize::XXLarge => 6,
-            KeywordSize::XXXLarge => 7,
-        }
-    }
-}
-
-impl Default for KeywordSize {
-    fn default() -> Self {
-        KeywordSize::Medium
-    }
-}
-
-impl ToCss for KeywordSize {
-    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
-    where
-        W: Write,
-    {
-        dest.write_str(match *self {
-            KeywordSize::XXSmall => "xx-small",
-            KeywordSize::XSmall => "x-small",
-            KeywordSize::Small => "small",
-            KeywordSize::Medium => "medium",
-            KeywordSize::Large => "large",
-            KeywordSize::XLarge => "x-large",
-            KeywordSize::XXLarge => "xx-large",
-            KeywordSize::XXXLarge => unreachable!("We should never serialize \
-                                      specified values set via
-                                      HTML presentation attributes"),
-        })
-    }
 }
 
 /// This is the ratio applied for font-size: larger
@@ -672,7 +635,7 @@ impl FontSize {
     #[inline]
     /// Get initial value for specified font size.
     pub fn medium() -> Self {
-        FontSize::Keyword(computed::KeywordInfo::medium())
+        FontSize::Keyword(KeywordInfo::medium())
     }
 
     /// Parses a font-size, with quirks.