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Extract variant code to its own function in style_derive::to_css

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This commit is contained in:
Anthony Ramine 2018-03-06 09:43:59 +01:00
parent 14dd4217fa
commit 529a30a682
1 changed files with 84 additions and 77 deletions
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83
components/style_derive/to_css.rs
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@ -2,11 +2,11 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use cg;
use cg::{self, WhereClause};
use darling::util::Override;
use quote::Tokens;
use syn::{self, Ident};
use synstructure;
use synstructure::{Structure, VariantInfo};
pub fn derive(input: syn::DeriveInput) -> Tokens {
let name = &input.ident;
@ -15,9 +15,50 @@ pub fn derive(input: syn::DeriveInput) -> Tokens {
cg::trait_parts(&input, &trait_path);
let input_attrs = cg::parse_input_attrs::<CssInputAttrs>(&input);
let s = synstructure::Structure::new(&input);
let s = Structure::new(&input);
let match_body = s.each_variant(|variant| {
derive_variant_arm(variant, &mut where_clause)
});
let mut impls = quote! {
impl #impl_generics ::style_traits::ToCss for #name #ty_generics #where_clause {
#[allow(unused_variables)]
#[inline]
fn to_css<W>(
&self,
dest: &mut ::style_traits::CssWriter<W>,
) -> ::std::fmt::Result
where
W: ::std::fmt::Write
{
match *self {
#match_body
}
}
}
};
if input_attrs.derive_debug {
impls.append_all(quote! {
impl #impl_generics ::std::fmt::Debug for #name #ty_generics #where_clause {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
::style_traits::ToCss::to_css(
self,
&mut ::style_traits::CssWriter::new(f),
)
}
}
});
}
impls
}
fn derive_variant_arm(
variant: &VariantInfo,
where_clause: &mut WhereClause,
) -> Tokens {
let bindings = variant.bindings();
let identifier = cg::to_css_identifier(variant.ast().ident.as_ref());
let ast = variant.ast();
@ -91,41 +132,7 @@ pub fn derive(input: syn::DeriveInput) -> Tokens {
::std::fmt::Write::write_str(dest, ")")
}
}
Some(expr)
});
let mut impls = quote! {
impl #impl_generics ::style_traits::ToCss for #name #ty_generics #where_clause {
#[allow(unused_variables)]
#[inline]
fn to_css<W>(
&self,
dest: &mut ::style_traits::CssWriter<W>,
) -> ::std::fmt::Result
where
W: ::std::fmt::Write
{
match *self {
#match_body
}
}
}
};
if input_attrs.derive_debug {
impls.append_all(quote! {
impl #impl_generics ::std::fmt::Debug for #name #ty_generics #where_clause {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
::style_traits::ToCss::to_css(
self,
&mut ::style_traits::CssWriter::new(f),
)
}
}
});
}
impls
expr
}
#[darling(attributes(css), default)]