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Don't prepend with space before paren

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This commit is contained in:
Guillaume Gomez 2020-03-17 15:08:11 +01:00
parent 59f4ba9504
commit aa20d96c31
1 changed files with 14 additions and 4 deletions
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18
src/librustc_ast_pretty/pprust.rs
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@ -148,12 +148,19 @@ pub fn to_string(f: impl FnOnce(&mut State<'_>)) -> String {
// This makes comma-separated lists look slightly nicer,
// and also addresses a specific regression described in issue #63896.
fn tt_prepend_space(tt: &TokenTree) -> bool {
fn tt_prepend_space(tt: &TokenTree, prev: &TokenTree) -> bool {
match tt {
TokenTree::Token(token) => match token.kind {
token::Comma => false,
_ => true,
},
TokenTree::Delimited(_, DelimToken::Paren, _) => match prev {
TokenTree::Token(token) => match token.kind {
token::Ident(_, _) => false,
_ => true,
},
_ => true,
},
_ => true,
}
}
@ -650,11 +657,14 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
}
fn print_tts(&mut self, tts: tokenstream::TokenStream, convert_dollar_crate: bool) {
for (i, tt) in tts.into_trees().enumerate() {
if i != 0 && tt_prepend_space(&tt) {
let mut iter = tts.into_trees().peekable();
while let Some(tt) = iter.next() {
let show_space =
if let Some(next) = iter.peek() { tt_prepend_space(next, &tt) } else { false };
self.print_tt(tt, convert_dollar_crate);
if show_space {
self.space();
}
self.print_tt(tt, convert_dollar_crate);
}
}