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Add comments to TokenCursor::desugar.

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It took me some time to work out what this code was doing.
This commit is contained in:
Nicholas Nethercote 2022-09-30 07:39:54 +10:00
parent 40e4827fd2
commit 9de9cf19d7
1 changed files with 5 additions and 1 deletions
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6
compiler/rustc_parse/src/parser/mod.rs
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@ -302,7 +302,10 @@ impl TokenCursor {
fn desugar(&mut self, attr_style: AttrStyle, data: Symbol, span: Span) -> (Token, Spacing) {
// Searches for the occurrences of `"#*` and returns the minimum number of `#`s
// required to wrap the text.
// required to wrap the text. E.g.
// - `abc d` is wrapped as `r"abc d"` (num_of_hashes = 0)
// - `abc "d"` is wrapped as `r#"abc "d""#` (num_of_hashes = 1)
// - `abc "##d##"` is wrapped as `r###"abc "d""###` (num_of_hashes = 3)
let mut num_of_hashes = 0;
let mut count = 0;
for ch in data.as_str().chars() {
@ -314,6 +317,7 @@ impl TokenCursor {
num_of_hashes = cmp::max(num_of_hashes, count);
}
// `/// foo` becomes `doc = r"foo".
let delim_span = DelimSpan::from_single(span);
let body = TokenTree::Delimited(
delim_span,