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Merge #7101

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7101: Fix spacing bug in proc-macro TokenStream::to_string r=edwin0cheng a=edwin0cheng

bors r+

fixes #7100

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>
This commit is contained in:
bors[bot] 2020-12-31 05:37:08 +00:00 committed by GitHub
commit a9814fa9c0
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1 changed files with 36 additions and 7 deletions
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43
crates/proc_macro_srv/src/rustc_server.rs
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@ -204,17 +204,18 @@ pub mod token_stream {
let content = subtree
.token_trees
.iter()
.map(|tkn| {
let s = to_text(tkn);
.fold((String::new(), true), |(last, last_to_joint), tkn| {
let s = [last, to_text(tkn)].join(if last_to_joint { "" } else { " " });
let mut is_joint = false;
if let tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) = tkn {
if punct.spacing == tt::Spacing::Alone {
return s + " ";
if punct.spacing == tt::Spacing::Joint {
is_joint = true;
}
}
s
(s, is_joint)
})
.collect::<Vec<_>>()
.concat();
.0;
let (open, close) = match subtree.delimiter.map(|it| it.kind) {
None => ("", ""),
Some(tt::DelimiterKind::Brace) => ("{", "}"),
@ -710,4 +711,32 @@ mod tests {
assert_eq!(srv.character('c').text, "'c'");
assert_eq!(srv.byte_string(b"1234586\x88").text, "b\"1234586\\x88\"");
}
#[test]
fn test_rustc_server_to_string() {
let s = TokenStream {
subtree: tt::Subtree {
delimiter: None,
token_trees: vec![
tt::TokenTree::Leaf(tt::Leaf::Ident(tt::Ident {
text: "struct".into(),
id: tt::TokenId::unspecified(),
})),
tt::TokenTree::Leaf(tt::Leaf::Ident(tt::Ident {
text: "T".into(),
id: tt::TokenId::unspecified(),
})),
tt::TokenTree::Subtree(tt::Subtree {
delimiter: Some(tt::Delimiter {
id: tt::TokenId::unspecified(),
kind: tt::DelimiterKind::Brace,
}),
token_trees: vec![],
}),
],
},
};
assert_eq!(s.to_string(), "struct T {}");
}
}