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Shrink mbe::ExpandError and mbe::ParseError

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This commit is contained in:
Lukas Wirth 2022-02-03 17:25:24 +01:00
parent 2310908df7
commit 2ad71f1350
8 changed files with 78 additions and 92 deletions
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14
crates/mbe/src/parser.rs
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@ -104,12 +104,6 @@ enum Mode {
Template,
}
macro_rules! err {
($($tt:tt)*) => {
ParseError::UnexpectedToken(($($tt)*).to_string())
};
}
fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Result<Op, ParseError> {
let res = match first {
tt::TokenTree::Leaf(leaf @ tt::Leaf::Punct(tt::Punct { char: '$', .. })) => {
@ -142,7 +136,7 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
Op::Var { name, kind, id }
}
tt::Leaf::Punct(_) | tt::Leaf::Literal(_) => {
return Err(ParseError::Expected("ident".to_string()))
return Err(ParseError::expected("expected ident"))
}
},
}
@ -158,8 +152,10 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
fn eat_fragment_kind(src: &mut TtIter<'_>, mode: Mode) -> Result<Option<SmolStr>, ParseError> {
if let Mode::Pattern = mode {
src.expect_char(':').map_err(|()| err!("missing fragment specifier"))?;
let ident = src.expect_ident().map_err(|()| err!("missing fragment specifier"))?;
src.expect_char(':').map_err(|()| ParseError::unexpected("missing fragment specifier"))?;
let ident = src
.expect_ident()
.map_err(|()| ParseError::unexpected("missing fragment specifier"))?;
return Ok(Some(ident.text.clone()));
};
Ok(None)