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style: Introduce css(parse_condition).
This will allow us to add a pref for this, and to parse it only on chrome easily. Bug: 1288572 Reviewed-by: xidorn MozReview-Commit-ID: L1rsyc2A2hu
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commit
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3 changed files with 50 additions and 8 deletions
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@ -12,6 +12,7 @@ pub fn derive(input: DeriveInput) -> Tokens {
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let name = &input.ident;
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let s = synstructure::Structure::new(&input);
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let mut saw_condition = false;
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let match_body = s.variants().iter().fold(quote!(), |match_body, variant| {
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let bindings = variant.bindings();
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assert!(
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@ -29,11 +30,16 @@ pub fn derive(input: DeriveInput) -> Tokens {
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);
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let ident = &variant.ast().ident;
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let mut body = quote! {
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#match_body
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#identifier => Ok(#name::#ident),
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saw_condition |= variant_attrs.parse_condition.is_some();
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let condition = match variant_attrs.parse_condition {
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Some(ref p) => quote! { if #p(context) },
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None => quote! { },
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};
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let mut body = quote! {
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#match_body
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#identifier #condition => Ok(#name::#ident),
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};
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let aliases = match variant_attrs.aliases {
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Some(aliases) => aliases,
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@ -43,25 +49,51 @@ pub fn derive(input: DeriveInput) -> Tokens {
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for alias in aliases.split(",") {
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body = quote! {
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#body
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#alias => Ok(#name::#ident),
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#alias #condition => Ok(#name::#ident),
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};
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}
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body
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});
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let context_ident = if saw_condition {
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quote! { context }
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} else {
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quote! { _ }
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};
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let parse_body = if saw_condition {
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quote! {
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let location = input.current_source_location();
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let ident = input.expect_ident()?;
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match_ignore_ascii_case! { &ident,
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#match_body
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_ => Err(location.new_unexpected_token_error(
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::cssparser::Token::Ident(ident.clone())
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))
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}
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}
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} else {
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quote! { Self::parse(input) }
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};
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let parse_trait_impl = quote! {
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impl ::parser::Parse for #name {
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#[inline]
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fn parse<'i, 't>(
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_: &::parser::ParserContext,
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#context_ident: &::parser::ParserContext,
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input: &mut ::cssparser::Parser<'i, 't>,
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) -> Result<Self, ::style_traits::ParseError<'i>> {
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Self::parse(input)
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#parse_body
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}
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}
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};
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if saw_condition {
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return parse_trait_impl;
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}
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// TODO(emilio): It'd be nice to get rid of these, but that makes the
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// conversion harder...
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let methods_impl = quote! {
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@ -235,6 +235,7 @@ pub struct CssVariantAttrs {
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pub dimension: bool,
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pub keyword: Option<String>,
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pub aliases: Option<String>,
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pub parse_condition: Option<Path>,
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pub skip: bool,
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}
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