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Fix pattern proc macro not working in macro_rules #282

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Merged
CasualX merged 3 commits into from
Feb 8, 2025
Merged

Fix pattern proc macro not working in macro_rules #282

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1171e0f
expand no-delimiter TokenTree:Group
tremwil Feb 2, 2025
e43d44c
cargo fmt
tremwil Feb 2, 2025
88601ad
re-add whitespace removed by rustfmt
tremwil Feb 7, 2025
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10 changes: 9 additions & 1 deletion src/proc-macros/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,15 @@ use proc_macro::*;
/// ```
#[proc_macro]
pub fn pattern(input: TokenStream) -> TokenStream {
let input = input.into_iter().collect::<Vec<_>>();
let mut input = input.into_iter().collect::<Vec<_>>();

// When calling the macro with a macro_rules capture, say $pat, the TokenTree
// will instead be a no-delimiter Group containing the expanded value of $pat.
// Unpack no-delimiter groups to handle this
match &input[..] {
[TokenTree::Group(g)] if g.delimiter() == Delimiter::None => input = g.stream().into_iter().collect::<Vec<_>>(),
_ => (),
};

let string = match &input[..] {
[TokenTree::Literal(lit)] => parse_str_literal(&lit),
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