Bug 1639905 - Derive parse for TextOverflowSide. r=boris

Depends on D76330

Differential Revision: https://phabricator.services.mozilla.com/D76331

servo/components/style/parser.rs

@@ -207,6 +207,12 @@ where
     }
 }
 
+impl Parse for crate::OwnedStr {
+    fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
+        Ok(input.expect_string()?.as_ref().to_owned().into())
+    }
+}
+
 impl Parse for UnicodeRange {
     fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
         Ok(UnicodeRange::parse(input)?)

servo/components/style/values/specified/text.rs

@@ -128,6 +128,7 @@ impl ToComputedValue for LineHeight {
     Eq,
     MallocSizeOf,
     PartialEq,
+    Parse,
     SpecifiedValueInfo,
     ToComputedValue,
     ToCss,
@@ -144,30 +145,6 @@ pub enum TextOverflowSide {
     String(crate::OwnedStr),
 }
 
-impl Parse for TextOverflowSide {
-    fn parse<'i, 't>(
-        _context: &ParserContext,
-        input: &mut Parser<'i, 't>,
-    ) -> Result<TextOverflowSide, ParseError<'i>> {
-        let location = input.current_source_location();
-        match *input.next()? {
-            Token::Ident(ref ident) => {
-                match_ignore_ascii_case! { ident,
-                    "clip" => Ok(TextOverflowSide::Clip),
-                    "ellipsis" => Ok(TextOverflowSide::Ellipsis),
-                    _ => Err(location.new_custom_error(
-                        SelectorParseErrorKind::UnexpectedIdent(ident.clone())
-                    ))
-                }
-            },
-            Token::QuotedString(ref v) => {
-                Ok(TextOverflowSide::String(v.as_ref().to_owned().into()))
-            },
-            ref t => Err(location.new_unexpected_token_error(t.clone())),
-        }
-    }
-}
-
 #[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
 /// text-overflow. Specifies rendering when inline content overflows its line box edge.
 pub struct TextOverflow {