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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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161
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;
@ -15,83 +15,10 @@ 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| {
let bindings = variant.bindings();
let identifier = cg::to_css_identifier(variant.ast().ident.as_ref());
let ast = variant.ast();
let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(&ast);
let separator = if variant_attrs.comma { ", " } else { " " };
if variant_attrs.dimension {
assert_eq!(bindings.len(), 1);
assert!(
variant_attrs.function.is_none() && variant_attrs.keyword.is_none(),
"That makes no sense"
);
}
let mut expr = if let Some(keyword) = variant_attrs.keyword {
assert!(bindings.is_empty());
let keyword = keyword.to_string();
quote! {
::std::fmt::Write::write_str(dest, #keyword)
}
} else if !bindings.is_empty() {
let mut expr = quote! {};
if variant_attrs.iterable {
assert_eq!(bindings.len(), 1);
let binding = &bindings[0];
expr = quote! {
#expr
for item in #binding.iter() {
writer.item(&item)?;
}
};
} else {
for binding in bindings {
let attrs = cg::parse_field_attrs::<CssFieldAttrs>(&binding.ast());
if attrs.skip {
continue;
}
if !attrs.ignore_bound {
where_clause.add_trait_bound(&binding.ast().ty);
}
expr = quote! {
#expr
writer.item(#binding)?;
};
}
}
quote! {{
let mut writer = ::style_traits::values::SequenceWriter::new(dest, #separator);
#expr
Ok(())
}}
} else {
quote! {
::std::fmt::Write::write_str(dest, #identifier)
}
};
if variant_attrs.dimension {
expr = quote! {
#expr?;
::std::fmt::Write::write_str(dest, #identifier)
}
} else if let Some(function) = variant_attrs.function {
let mut identifier = function.explicit().map_or(identifier, |name| name.to_string());
identifier.push_str("(");
expr = quote! {
::std::fmt::Write::write_str(dest, #identifier)?;
#expr?;
::std::fmt::Write::write_str(dest, ")")
}
}
Some(expr)
derive_variant_arm(variant, &mut where_clause)
});
let mut impls = quote! {
@ -128,6 +55,86 @@ pub fn derive(input: syn::DeriveInput) -> Tokens {
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();
let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(&ast);
let separator = if variant_attrs.comma { ", " } else { " " };
if variant_attrs.dimension {
assert_eq!(bindings.len(), 1);
assert!(
variant_attrs.function.is_none() && variant_attrs.keyword.is_none(),
"That makes no sense"
);
}
let mut expr = if let Some(keyword) = variant_attrs.keyword {
assert!(bindings.is_empty());
let keyword = keyword.to_string();
quote! {
::std::fmt::Write::write_str(dest, #keyword)
}
} else if !bindings.is_empty() {
let mut expr = quote! {};
if variant_attrs.iterable {
assert_eq!(bindings.len(), 1);
let binding = &bindings[0];
expr = quote! {
#expr
for item in #binding.iter() {
writer.item(&item)?;
}
};
} else {
for binding in bindings {
let attrs = cg::parse_field_attrs::<CssFieldAttrs>(&binding.ast());
if attrs.skip {
continue;
}
if !attrs.ignore_bound {
where_clause.add_trait_bound(&binding.ast().ty);
}
expr = quote! {
#expr
writer.item(#binding)?;
};
}
}
quote! {{
let mut writer = ::style_traits::values::SequenceWriter::new(dest, #separator);
#expr
Ok(())
}}
} else {
quote! {
::std::fmt::Write::write_str(dest, #identifier)
}
};
if variant_attrs.dimension {
expr = quote! {
#expr?;
::std::fmt::Write::write_str(dest, #identifier)
}
} else if let Some(function) = variant_attrs.function {
let mut identifier = function.explicit().map_or(identifier, |name| name.to_string());
identifier.push_str("(");
expr = quote! {
::std::fmt::Write::write_str(dest, #identifier)?;
#expr?;
::std::fmt::Write::write_str(dest, ")")
}
}
expr
}
#[darling(attributes(css), default)]
#[derive(Default, FromDeriveInput)]
struct CssInputAttrs {