style: Remove PropertyId::name.

It's only used for the error path in property parsing, so most of the time is
not useful.

Use the just-introduced NonCustomPropertyId::name to preserve the alias name,
which we were doing by passing the name around.

Bug: 1466645
Reviewed-by: xidorn
MozReview-Commit-ID: 46xxZKCoeBB

components/style/properties/declaration_block.rs

@@ -1116,9 +1116,7 @@ where
     let mut parser = Parser::new(&mut input);
     let start_position = parser.position();
     parser.parse_entirely(|parser| {
-        let name = id.name().into();
-        PropertyDeclaration::parse_into(declarations, id, name, &context, parser)
-            .map_err(|e| e.into())
+        PropertyDeclaration::parse_into(declarations, id, &context, parser)
     }).map_err(|err| {
         let location = err.location;
         let error = ContextualParseError::UnsupportedPropertyDeclaration(
@@ -1169,7 +1167,7 @@ impl<'a, 'b, 'i> DeclarationParser<'i> for PropertyDeclarationParser<'a, 'b> {
             }
         };
         input.parse_until_before(Delimiter::Bang, |input| {
-            PropertyDeclaration::parse_into(self.declarations, id, name, self.context, input)
+            PropertyDeclaration::parse_into(self.declarations, id, self.context, input)
         })?;
         let importance = match input.try(parse_important) {
             Ok(()) => Importance::Important,

components/style/properties/properties.mako.rs

@@ -23,7 +23,7 @@ use std::fmt::{self, Write};
 use std::mem::{self, ManuallyDrop};
 
 #[cfg(feature = "servo")] use cssparser::RGBA;
-use cssparser::{CowRcStr, Parser, TokenSerializationType, serialize_identifier};
+use cssparser::{Parser, TokenSerializationType};
 use cssparser::ParserInput;
 #[cfg(feature = "servo")] use euclid::SideOffsets2D;
 use context::QuirksMode;
@@ -1765,21 +1765,6 @@ impl PropertyId {
         }
     }
 
-    /// Returns the name of the property without CSS escaping.
-    pub fn name(&self) -> Cow<'static, str> {
-        match *self {
-            PropertyId::ShorthandAlias(id, _) |
-            PropertyId::Shorthand(id) => id.name().into(),
-            PropertyId::LonghandAlias(id, _) |
-            PropertyId::Longhand(id) => id.name().into(),
-            PropertyId::Custom(ref name) => {
-                let mut s = String::new();
-                write!(&mut s, "--{}", name).unwrap();
-                s.into()
-            }
-        }
-    }
-
     fn non_custom_id(&self) -> Option<NonCustomPropertyId> {
         Some(match *self {
             PropertyId::Custom(_) => return None,
@@ -2042,13 +2027,13 @@ impl PropertyDeclaration {
     pub fn parse_into<'i, 't>(
         declarations: &mut SourcePropertyDeclaration,
         id: PropertyId,
-        name: CowRcStr<'i>,
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<(), ParseError<'i>> {
         assert!(declarations.is_empty());
         debug_assert!(id.allowed_in(context), "{:?}", id);
 
+        let non_custom_id = id.non_custom_id();
         let start = input.state();
         match id {
             PropertyId::Custom(property_name) => {
@@ -2059,7 +2044,10 @@ impl PropertyDeclaration {
                     Ok(keyword) => DeclaredValueOwned::CSSWideKeyword(keyword),
                     Err(()) => match ::custom_properties::SpecifiedValue::parse(input) {
                         Ok(value) => DeclaredValueOwned::Value(value),
-                        Err(e) => return Err(StyleParseErrorKind::new_invalid(name, e)),
+                        Err(e) => return Err(StyleParseErrorKind::new_invalid(
+                            format!("--{}", property_name),
+                            e,
+                        )),
                     }
                 };
                 declarations.push(PropertyDeclaration::Custom(CustomDeclaration {
@@ -2084,7 +2072,10 @@ impl PropertyDeclaration {
                             input.reset(&start);
                             let (first_token_type, css) =
                                 ::custom_properties::parse_non_custom_with_var(input).map_err(|e| {
-                                    StyleParseErrorKind::new_invalid(name, e)
+                                    StyleParseErrorKind::new_invalid(
+                                        non_custom_id.unwrap().name(),
+                                        e,
+                                    )
                                 })?;
                             Ok(PropertyDeclaration::WithVariables(VariableDeclaration {
                                 id,
@@ -2096,7 +2087,10 @@ impl PropertyDeclaration {
                                 }),
                             }))
                         } else {
-                            Err(StyleParseErrorKind::new_invalid(name, err))
+                            Err(StyleParseErrorKind::new_invalid(
+                                non_custom_id.unwrap().name(),
+                                err,
+                            ))
                         }
                     })
                 }).map(|declaration| {
@@ -2130,7 +2124,10 @@ impl PropertyDeclaration {
                             input.reset(&start);
                             let (first_token_type, css) =
                                 ::custom_properties::parse_non_custom_with_var(input).map_err(|e| {
-                                    StyleParseErrorKind::new_invalid(name, e)
+                                    StyleParseErrorKind::new_invalid(
+                                        non_custom_id.unwrap().name(),
+                                        e,
+                                    )
                                 })?;
                             let unparsed = Arc::new(UnparsedValue {
                                 css: css.into_owned(),
@@ -2152,7 +2149,10 @@ impl PropertyDeclaration {
                             }
                             Ok(())
                         } else {
-                            Err(StyleParseErrorKind::new_invalid(name, err))
+                            Err(StyleParseErrorKind::new_invalid(
+                                non_custom_id.unwrap().name(),
+                                err,
+                            ))
                         }
                     })
                 }

components/style/stylesheets/keyframes_rule.rs

@@ -623,12 +623,12 @@ impl<'a, 'b, 'i> DeclarationParser<'i> for KeyframeDeclarationParser<'a, 'b> {
         let id = match PropertyId::parse(&name, self.context) {
             Ok(id) => id,
             Err(()) => return Err(input.new_custom_error(
-                StyleParseErrorKind::UnknownProperty(name.clone())
+                StyleParseErrorKind::UnknownProperty(name)
             )),
         };
 
         // TODO(emilio): Shouldn't this use parse_entirely?
-        PropertyDeclaration::parse_into(self.declarations, id, name, self.context, input)?;
+        PropertyDeclaration::parse_into(self.declarations, id, self.context, input)?;
 
         // In case there is still unparsed text in the declaration, we should
         // roll back.

components/style/stylesheets/supports_rule.rs

@@ -324,12 +324,15 @@ impl Declaration {
 
             let mut declarations = SourcePropertyDeclaration::new();
             input.parse_until_before(Delimiter::Bang, |input| {
-                    PropertyDeclaration::parse_into(&mut declarations, id, prop, &context, input)
-                        .map_err(|_| input.new_custom_error(()))
+                PropertyDeclaration::parse_into(
+                    &mut declarations,
+                    id,
+                    &context,
+                    input,
+                ).map_err(|_| input.new_custom_error(()))
             })?;
             let _ = input.try(parse_important);
             Ok(())
-            })
-            .is_ok()
+        }).is_ok()
     }
 }

components/style_traits/lib.rs

@@ -177,7 +177,11 @@ pub enum ValueParseErrorKind<'i> {
 
 impl<'i> StyleParseErrorKind<'i> {
     /// Create an InvalidValue parse error
-    pub fn new_invalid(name: CowRcStr<'i>, value_error: ParseError<'i>) -> ParseError<'i> {
+    pub fn new_invalid<S>(name: S, value_error: ParseError<'i>) -> ParseError<'i>
+    where
+        S: Into<CowRcStr<'i>>,
+    {
+        let name = name.into();
         let variant = match value_error.kind {
             cssparser::ParseErrorKind::Custom(StyleParseErrorKind::ValueError(e)) => {
                 match e {