Introduce #[css(if_empty = "…", iterable)]

This commit is contained in:
Anthony Ramine 2018-03-07 13:07:13 +01:00
parent 92f116a95c
commit 90b23963b7
4 changed files with 48 additions and 80 deletions

View file

@ -27,6 +27,8 @@ use std::fmt::{self, Write};
/// * if `#[css(iterable)]` is found on a function variant, that variant needs
/// to have a single member, and that member needs to be iterable. The
/// iterable will be serialized as the arguments for the function;
/// * an iterable field can also be annotated with `#[css(if_empty = "foo")]`
/// to print `"foo"` if the iterator is empty;
/// * if `#[css(dimension)]` is found on a variant, that variant needs
/// to have a single member. The variant would be serialized as a CSS
/// dimension token, like: <member><identifier>;
@ -210,6 +212,21 @@ where
}
}
/// A wrapper type that implements `ToCss` by printing its inner field.
pub struct Verbatim<'a, T>(pub &'a T)
where
T: ?Sized + 'a;
impl<'a, T> ToCss for Verbatim<'a, T>
where
T: AsRef<str> + ?Sized + 'a,
{
#[inline]
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result where W: Write {
dest.write_str(self.0.as_ref())
}
}
/// 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.