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other parsing adjustment!

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Sébastien Besnier 2020-11-08 11:08:06 +01:00
parent bf68477c8a
commit 66392eeeaf
4 changed files with 152 additions and 9 deletions
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57
compiler/parse/src/blankspace.rs
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@ -239,6 +239,63 @@ pub fn line_comment<'a>() -> impl Parser<'a, &'a str> {
)
}
#[inline(always)]
pub fn spaces_exactly<'a>(spaces_expected: u16) -> impl Parser<'a, ()> {
move |_arena: &'a Bump, state: State<'a>| {
if spaces_expected == 0 {
return Ok(((), state));
}
let mut state = state;
let mut spaces_seen: u16 = 0;
while !state.bytes.is_empty() {
match peek_utf8_char(&state) {
Ok((' ', _)) => {
spaces_seen += 1;
state = state.advance_spaces(1)?;
if spaces_seen == spaces_expected {
return Ok(((), state));
}
}
Ok(_) => {
return Err(unexpected(
spaces_seen.into(),
state.clone(),
state.attempting,
));
}
Err(FailReason::BadUtf8) => {
// If we hit an invalid UTF-8 character, bail out immediately.
return state.fail(FailReason::BadUtf8);
}
Err(_) => {
if spaces_seen == 0 {
return Err(unexpected_eof(0, state.attempting, state));
} else {
return Err(unexpected(
spaces_seen.into(),
state.clone(),
state.attempting,
));
}
}
}
}
if spaces_seen == 0 {
return Err(unexpected_eof(0, state.attempting, state));
} else {
return Err(unexpected(
spaces_seen.into(),
state.clone(),
state.attempting,
));
}
}
}
#[inline(always)]
fn spaces<'a>(
require_at_least_one: bool,