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Avoid an unwrap in #[derive(ToCss)]

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This commit is contained in:
Anthony Ramine 2017-06-16 13:55:26 +02:00
parent e1bce24129
commit d65a7e6f95
1 changed files with 5 additions and 6 deletions
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11
components/style_derive/to_css.rs
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@ -17,12 +17,7 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let style = synstructure::BindStyle::Ref.into();
let match_body = synstructure::each_variant(&input, &style, |bindings, variant| {
let mut identifier = to_css_identifier(variant.ident.as_ref());
let mut expr = if bindings.is_empty() {
quote! {
::std::fmt::Write::write_str(dest, #identifier)
}
} else {
let (first, rest) = bindings.split_first().expect("unit variants are not yet supported");
let mut expr = if let Some((first, rest)) = bindings.split_first() {
where_clause.predicates.push(where_predicate(first.field.ty.clone()));
let mut expr = quote! {
::style_traits::ToCss::to_css(#first, dest)
@ -36,6 +31,10 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
};
}
expr
} else {
quote! {
::std::fmt::Write::write_str(dest, #identifier)
}
};
let mut css_attrs = variant.attrs.iter().filter(|attr| attr.name() == "css");
let is_function = css_attrs.next().map_or(false, |attr| {