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generator: Don't zip the same iterator with and without filter

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`constants` is iterated twice here: once with a filter, the other time
without, and the results are zipped together.  Besides being able to
simplify the entire execution to just one `iter()` without intermediary
iterators, removing `.zip()` makes it impossible for the results in both
iterators to get mismatched when the `filter` inevitably skips elements.
Fortunately no such cases seem to exist, or at least not that effect the
resulting generated code.
This commit is contained in:
Marijn Suijten 2021-12-20 23:12:44 +01:00 committed by Benjamin Saunders
parent ac94739e11
commit fe55ad73bd
1 changed files with 7 additions and 15 deletions
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14
generator/src/lib.rs
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@ -1426,28 +1426,20 @@ pub fn bitflags_impl_block(
.filter(|constant| constant.notation() != Some(BACKWARDS_COMPATIBLE_ALIAS_COMMENT))
.map(|constant| {
let variant_ident = constant.variant_ident(enum_name);
let notation = constant.doc_attribute();
let constant = constant.constant(enum_name);
let tokens = if let Constant::Alias(_) = &constant {
let value = if let Constant::Alias(_) = &constant {
quote!(#constant)
} else {
quote!(Self(#constant))
};
(variant_ident, tokens)
})
.collect_vec();
let notations = constants.iter().map(|constant| constant.doc_attribute());
let variants =
variants
.iter()
.zip(notations.clone())
.map(|((variant_ident, value), ref notation)| {
quote! {
#notation
pub const #variant_ident: Self = #value;
}
});
quote! {
impl #ident {
#(#variants)*