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feat: support fake variadic when length 1 not included #51

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8fa9e10
feat: support fake variadic when length 1 not included
kingwingfly Dec 18, 2025
f38fee1
fix typo
kingwingfly Dec 18, 2025
a2995fa
fix bug
kingwingfly Dec 18, 2025
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118 changes: 82 additions & 36 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -28,17 +28,15 @@ impl Parse for AllTuples {
let macro_ident = input.parse::<Ident>()?;
input.parse::<Comma>()?;
let start = input.parse::<LitInt>()?.base10_parse()?;

if start > 1 && fake_variadic {
return Err(Error::new(
input.span(),
"#[doc(fake_variadic)] only works when the tuple with length one is included",
));
}

input.parse::<Comma>()?;
let end_span = input.span();
let end = input.parse::<LitInt>()?.base10_parse()?;
input.parse::<Comma>()?;

if end < start {
return Err(Error::new(end_span, "`start` should <= `end`"));
}

let mut idents = vec![input.parse::<Ident>()?];
while input.parse::<Comma>().is_ok() {
idents.push(input.parse::<Ident>()?);
Expand Down Expand Up @@ -182,13 +180,20 @@ pub fn all_tuples(input: TokenStream) -> TokenStream {
})
.collect::<Vec<_>>();
let macro_ident = &input.macro_ident;
let invocations = (input.start..=input.end).map(|n| {
let ident_tuples = choose_ident_tuples(&input, &ident_tuples, n);
let attrs = attrs(&input, n);
quote! {
#macro_ident!(#attrs #ident_tuples);
}
});
let invocations = (input.start..=input.end)
.chain(if input.fake_variadic && input.start > 1 {
// chain n = 1
vec![1]
} else {
vec![]
})
.map(|n| {
let ident_tuples = choose_ident_tuples(&input, &ident_tuples, n);
let attrs = attrs(&input, n);
quote! {
#macro_ident!(#attrs #ident_tuples);
}
});
TokenStream::from(quote! {
#(
#invocations
Expand Down Expand Up @@ -262,13 +267,19 @@ pub fn all_tuples_enumerated(input: TokenStream) -> TokenStream {
})
.collect::<Vec<_>>();
let macro_ident = &input.macro_ident;
let invocations = (input.start..=input.end).map(|n| {
let ident_tuples = choose_ident_tuples_enumerated(&input, &ident_tuples, n);
let attrs = attrs(&input, n);
quote! {
#macro_ident!(#attrs #ident_tuples);
}
});
let invocations = (input.start..=input.end)
.chain(if input.fake_variadic && input.start > 1 {
vec![1]
} else {
vec![]
})
.map(|n| {
let ident_tuples = choose_ident_tuples_enumerated(&input, &ident_tuples, n);
let attrs = attrs(&input, n);
quote! {
#macro_ident!(#attrs #ident_tuples);
}
});
TokenStream::from(quote! {
#(
#invocations
Expand Down Expand Up @@ -408,13 +419,19 @@ pub fn all_tuples_with_size(input: TokenStream) -> TokenStream {
})
.collect::<Vec<_>>();
let macro_ident = &input.macro_ident;
let invocations = (input.start..=input.end).map(|n| {
let ident_tuples = choose_ident_tuples(&input, &ident_tuples, n);
let attrs = attrs(&input, n);
quote! {
#macro_ident!(#n, #attrs #ident_tuples);
}
});
let invocations = (input.start..=input.end)
.chain(if input.fake_variadic && input.start > 1 {
vec![1]
} else {
vec![]
})
.map(|n| {
let ident_tuples = choose_ident_tuples(&input, &ident_tuples, n);
let attrs = attrs(&input, n);
quote! {
#macro_ident!(#n, #attrs #ident_tuples);
}
});
TokenStream::from(quote! {
#(
#invocations
Expand Down Expand Up @@ -476,8 +493,8 @@ fn choose_ident_tuples_enumerated(
}
}

fn to_ident_tuple(idents: impl Iterator<Item = Ident>, len: usize) -> TokenStream2 {
if len < 2 {
fn to_ident_tuple(idents: impl Iterator<Item = Ident>, generic_num: usize) -> TokenStream2 {
if generic_num < 2 {
quote! { #(#idents)* }
} else {
quote! { (#(#idents),*) }
Expand Down Expand Up @@ -505,14 +522,43 @@ fn attrs(input: &AllTuples, n: usize) -> TokenStream2 {
if n == 1 {
let doc = LitStr::new(
&format!(
"This trait is implemented for tuples down to {} up to {} items long.",
input.start, input.end
"This trait is implemented for tuple{s1} {range} item{s2} long.",
range = if input.start == input.end {
format!("exactly {}", input.start)
} else {
format!(
"{down}up to {up}",
down = if input.start != 0 {
format!("down to {} ", input.start)
} else {
"".to_string()
},
up = input.end
)
},
s1 = if input.end > input.start { "s" } else { "" },
s2 = if input.end >= input.start && input.end > 1 {
"s"
} else {
""
}
),
Span2::call_site(),
);
quote! {
#[cfg_attr(#cfg, doc(fake_variadic))]
#[cfg_attr(#cfg, doc = #doc)]
if input.start <= 1 && input.end >= 1 {
// n == 1 and it's included
quote! {
#[cfg_attr(#cfg, doc(fake_variadic))]
#[cfg_attr(#cfg, doc = #doc)]
}
} else {
// n == 1 but it's not included,
// only generate if #cfg
quote! {
#[cfg(#cfg)]
#[doc(fake_variadic)]
#[doc = #doc]
}
}
} else {
quote! { #[cfg_attr(#cfg, doc(hidden))] }
Expand Down
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