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Extract variant code to its own function in style_derive::to_css
This commit is contained in:
Anthony Ramine
parent
14dd4217fa
commit
529a30a682
1 changed files with 84 additions and 77 deletions
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@ -2,11 +2,11 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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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 cg::{self, WhereClause};
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use darling::util::Override;
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use quote::Tokens;
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use syn::{self, Ident};
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use synstructure;
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use synstructure::{Structure, VariantInfo};
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pub fn derive(input: syn::DeriveInput) -> Tokens {
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let name = &input.ident;
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@ -15,83 +15,10 @@ pub fn derive(input: syn::DeriveInput) -> Tokens {
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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 s = synstructure::Structure::new(&input);
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let s = Structure::new(&input);
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let match_body = s.each_variant(|variant| {
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let bindings = variant.bindings();
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let identifier = cg::to_css_identifier(variant.ast().ident.as_ref());
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let ast = variant.ast();
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let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(&ast);
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let separator = if variant_attrs.comma { ", " } else { " " };
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if variant_attrs.dimension {
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assert_eq!(bindings.len(), 1);
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assert!(
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variant_attrs.function.is_none() && variant_attrs.keyword.is_none(),
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"That makes no sense"
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);
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}
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let mut expr = if let Some(keyword) = variant_attrs.keyword {
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assert!(bindings.is_empty());
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let keyword = keyword.to_string();
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quote! {
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::std::fmt::Write::write_str(dest, #keyword)
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}
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} else if !bindings.is_empty() {
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let mut expr = quote! {};
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if variant_attrs.iterable {
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assert_eq!(bindings.len(), 1);
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let binding = &bindings[0];
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expr = quote! {
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#expr
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for item in #binding.iter() {
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writer.item(&item)?;
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}
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};
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} else {
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for binding in bindings {
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let attrs = cg::parse_field_attrs::<CssFieldAttrs>(&binding.ast());
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if attrs.skip {
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continue;
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}
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if !attrs.ignore_bound {
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where_clause.add_trait_bound(&binding.ast().ty);
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}
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expr = quote! {
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#expr
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writer.item(#binding)?;
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};
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}
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}
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quote! {{
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let mut writer = ::style_traits::values::SequenceWriter::new(dest, #separator);
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#expr
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Ok(())
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}}
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} else {
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quote! {
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::std::fmt::Write::write_str(dest, #identifier)
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}
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};
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if variant_attrs.dimension {
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expr = quote! {
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#expr?;
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::std::fmt::Write::write_str(dest, #identifier)
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}
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} else if let Some(function) = variant_attrs.function {
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let mut identifier = function.explicit().map_or(identifier, |name| name.to_string());
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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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#expr?;
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::std::fmt::Write::write_str(dest, ")")
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}
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}
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Some(expr)
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derive_variant_arm(variant, &mut where_clause)
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});
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let mut impls = quote! {
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@ -128,6 +55,86 @@ pub fn derive(input: syn::DeriveInput) -> Tokens {
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impls
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}
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fn derive_variant_arm(
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variant: &VariantInfo,
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where_clause: &mut WhereClause,
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) -> Tokens {
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let bindings = variant.bindings();
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let identifier = cg::to_css_identifier(variant.ast().ident.as_ref());
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let ast = variant.ast();
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let variant_attrs = cg::parse_variant_attrs::<CssVariantAttrs>(&ast);
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let separator = if variant_attrs.comma { ", " } else { " " };
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if variant_attrs.dimension {
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assert_eq!(bindings.len(), 1);
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assert!(
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variant_attrs.function.is_none() && variant_attrs.keyword.is_none(),
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"That makes no sense"
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);
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}
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let mut expr = if let Some(keyword) = variant_attrs.keyword {
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assert!(bindings.is_empty());
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let keyword = keyword.to_string();
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quote! {
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::std::fmt::Write::write_str(dest, #keyword)
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}
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} else if !bindings.is_empty() {
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let mut expr = quote! {};
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if variant_attrs.iterable {
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assert_eq!(bindings.len(), 1);
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let binding = &bindings[0];
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expr = quote! {
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#expr
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for item in #binding.iter() {
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writer.item(&item)?;
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}
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};
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} else {
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for binding in bindings {
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let attrs = cg::parse_field_attrs::<CssFieldAttrs>(&binding.ast());
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if attrs.skip {
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continue;
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}
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if !attrs.ignore_bound {
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where_clause.add_trait_bound(&binding.ast().ty);
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}
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expr = quote! {
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#expr
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writer.item(#binding)?;
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};
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}
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}
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quote! {{
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let mut writer = ::style_traits::values::SequenceWriter::new(dest, #separator);
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#expr
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Ok(())
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}}
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} else {
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quote! {
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::std::fmt::Write::write_str(dest, #identifier)
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}
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};
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if variant_attrs.dimension {
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expr = quote! {
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#expr?;
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::std::fmt::Write::write_str(dest, #identifier)
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}
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} else if let Some(function) = variant_attrs.function {
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let mut identifier = function.explicit().map_or(identifier, |name| name.to_string());
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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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#expr?;
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::std::fmt::Write::write_str(dest, ")")
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}
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}
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expr
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}
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#[darling(attributes(css), default)]
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#[derive(Default, FromDeriveInput)]
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struct CssInputAttrs {
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