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Refactor parse_nt.

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This commit is contained in:
Mark-Simulacrum 2016-11-10 17:30:01 -07:00
parent 68abb24e8d
commit 27c09864bd
1 changed files with 13 additions and 8 deletions
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21
src/libsyntax/ext/tt/macro_parser.rs
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@ -479,14 +479,19 @@ pub fn parse_nt<'a>(p: &mut Parser<'a>, sp: Span, name: &str) -> Nonterminal {
p.quote_depth += 1; //but in theory, non-quoted tts might be useful
let mut tt = panictry!(p.parse_token_tree());
p.quote_depth -= 1;
loop {
let nt = match tt {
TokenTree::Token(_, token::Interpolated(ref nt)) => nt.clone(),
_ => break,
};
match *nt {
token::NtTT(ref sub_tt) => tt = sub_tt.clone(),
_ => break,
while let TokenTree::Token(sp, token::Interpolated(nt)) = tt {
if let token::NtTT(..) = *nt {
match Rc::try_unwrap(nt) {
Ok(token::NtTT(sub_tt)) => tt = sub_tt,
Ok(_) => unreachable!(),
Err(nt_rc) => match *nt_rc {
token::NtTT(ref sub_tt) => tt = sub_tt.clone(),
_ => unreachable!(),
},
}
} else {
tt = TokenTree::Token(sp, token::Interpolated(nt.clone()));
break
}
}
return token::NtTT(tt);