Introduce CommaWithSpace

This allows us to support stroke-dasharray the same way as comma-separated
values.

components/style/parser.rs

@@ -172,22 +172,6 @@ where
     }
 }
 
-/// Parse a non-empty space-separated or comma-separated list of objects parsed by parse_one
-pub fn parse_space_or_comma_separated<'i, 't, F, T>(input: &mut Parser<'i, 't>, mut parse_one: F)
-        -> Result<Vec<T>, ParseError<'i>>
-        where F: for<'ii, 'tt> FnMut(&mut Parser<'ii, 'tt>) -> Result<T, ParseError<'ii>> {
-    let first = parse_one(input)?;
-    let mut vec = vec![first];
-    loop {
-        let _ = input.try(|i| i.expect_comma());
-        if let Ok(val) = input.try(|i| parse_one(i)) {
-            vec.push(val)
-        } else {
-            break
-        }
-    }
-    Ok(vec)
-}
 impl Parse for UnicodeRange {
     fn parse<'i, 't>(_context: &ParserContext, input: &mut Parser<'i, 't>)
                      -> Result<Self, ParseError<'i>> {

components/style/properties/helpers.mako.rs

@@ -217,13 +217,12 @@
 
             pub fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
                                  -> Result<SpecifiedValue, ParseError<'i>> {
+                use style_traits::Separator;
                 #[allow(unused_imports)]
-                use parser::parse_space_or_comma_separated;
+                use style_traits::{Comma, CommaWithSpace};
 
                 <%
-                    parse_func = "Parser::parse_comma_separated"
-                    if space_separated_allowed:
-                        parse_func = "parse_space_or_comma_separated"
+                    separator = "CommaWithSpace" if space_separated_allowed else "Comma"
                 %>
 
                 % if allow_empty:
@@ -232,7 +231,7 @@
                     }
                 % endif
 
-                ${parse_func}(input, |parser| {
+                ${separator}::parse(input, |parser| {
                     single_value::parse(context, parser)
                 }).map(SpecifiedValue)
             }

components/style_traits/lib.rs

@@ -71,7 +71,7 @@ pub mod values;
 #[macro_use]
 pub mod viewport;
 
-pub use values::{Comma, OneOrMoreSeparated, Separator, Space, ToCss};
+pub use values::{Comma, CommaWithSpace, OneOrMoreSeparated, Separator, Space, ToCss};
 pub use viewport::HasViewportPercentage;
 
 /// The error type for all CSS parsing routines.

components/style_traits/values.rs

@@ -5,7 +5,7 @@
 //! Helper types and traits for the handling of CSS values.
 
 use app_units::Au;
-use cssparser::{ParseError, Parser, UnicodeRange, serialize_string};
+use cssparser::{BasicParseError, ParseError, Parser, Token, UnicodeRange, serialize_string};
 use std::fmt::{self, Write};
 
 /// Serialises a value according to its CSS representation.
@@ -191,6 +191,12 @@ pub struct Comma;
 /// separated by spaces.
 pub struct Space;
 
+/// Type used as the associated type in the `OneOrMoreSeparated` trait on a
+/// type to indicate that a serialized list of elements of this type is
+/// separated by commas, but spaces without commas are also allowed when
+/// parsing.
+pub struct CommaWithSpace;
+
 /// A trait satisfied by the types corresponding to separators.
 pub trait Separator {
     /// The separator string that the satisfying separator type corresponds to.
@@ -248,6 +254,33 @@ impl Separator for Space {
     }
 }
 
+impl Separator for CommaWithSpace {
+    fn separator() -> &'static str {
+        ", "
+    }
+
+    fn parse<'i, 't, F, T, E>(
+        input: &mut Parser<'i, 't>,
+        mut parse_one: F,
+    ) -> Result<Vec<T>, ParseError<'i, E>>
+    where
+        F: for<'tt> FnMut(&mut Parser<'i, 'tt>) -> Result<T, ParseError<'i, E>>
+    {
+        let mut results = vec![parse_one(input)?];
+        loop {
+            let comma = input.try(|i| i.expect_comma()).is_ok();
+            if let Ok(item) = input.try(&mut parse_one) {
+                results.push(item);
+            } else if comma {
+                return Err(BasicParseError::UnexpectedToken(Token::Comma).into());
+            } else {
+                break;
+            }
+        }
+        Ok(results)
+    }
+}
+
 /// Marker trait on T to automatically implement ToCss for Vec<T> when T's are
 /// separated by some delimiter `delim`.
 pub trait OneOrMoreSeparated {