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Implement #[css(derive_debug)]
This makes #[derive(ToCss)] derive Debug with a simple call to the to_css method.
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commit
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2 changed files with 33 additions and 41 deletions
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@ -3,21 +3,22 @@
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use cg;
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use quote;
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use syn;
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use quote::Tokens;
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use syn::DeriveInput;
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use synstructure;
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pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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pub fn derive(input: DeriveInput) -> Tokens {
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let name = &input.ident;
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let trait_path = &["style_traits", "ToCss"];
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let (impl_generics, ty_generics, mut where_clause) =
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cg::trait_parts(&input, trait_path);
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let input_attrs = cg::parse_input_attrs::<CssInputAttrs>(&input);
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let style = synstructure::BindStyle::Ref.into();
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let match_body = synstructure::each_variant(&input, &style, |bindings, variant| {
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let mut identifier = to_css_identifier(variant.ident.as_ref());
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let css_attrs = cg::parse_variant_attrs::<CssAttrs>(variant);
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let separator = if css_attrs.comma { ", " } else { " " };
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let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(variant);
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let separator = if variant_attrs.comma { ", " } else { " " };
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let mut expr = if !bindings.is_empty() {
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let mut expr = quote! {};
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for binding in bindings {
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@ -37,7 +38,7 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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::std::fmt::Write::write_str(dest, #identifier)
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}
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};
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if css_attrs.function {
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if variant_attrs.function {
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identifier.push_str("(");
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expr = quote! {
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::std::fmt::Write::write_str(dest, #identifier)?;
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@ -48,7 +49,7 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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Some(expr)
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});
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quote! {
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let mut impls = quote! {
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impl #impl_generics ::style_traits::ToCss for #name #ty_generics #where_clause {
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#[allow(unused_variables)]
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#[inline]
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@ -61,12 +62,32 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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}
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}
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}
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};
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if input_attrs.derive_debug {
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impls.append(quote! {
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impl #impl_generics ::std::fmt::Debug for #name #ty_generics #where_clause {
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fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
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::style_traits::ToCss::to_css(self, f)
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}
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}
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});
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}
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impls
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}
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#[derive(Default, FromVariant)]
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#[darling(attributes(css), default)]
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struct CssAttrs {
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#[derive(Default, FromDeriveInput)]
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struct CssInputAttrs {
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derive_debug: bool,
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function: bool,
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comma: bool,
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}
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#[darling(attributes(css), default)]
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#[derive(Default, FromVariant)]
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struct CssVariantAttrs {
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function: bool,
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comma: bool,
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}
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