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Support underscores in Dec numbers

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Closes #5303
This commit is contained in:
Ayaz Hafiz 2023-04-19 11:27:12 -05:00
parent ef5c4735fb
commit c497641e63
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3 changed files with 33 additions and 6 deletions
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36
crates/roc_std/src/lib.rs
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@ -298,12 +298,36 @@ impl RocDec {
};
// Calculate the high digits - the ones before the decimal point.
match before_point.parse::<i128>() {
Ok(answer) => match answer.checked_mul(Self::ONE_POINT_ZERO) {
Some(hi) => hi.checked_add(lo).map(|num| Self(num.to_ne_bytes())),
None => None,
},
Err(_) => None,
let (is_pos, digits) = match before_point.chars().next() {
Some('+') => (true, &before_point[1..]),
Some('-') => (false, &before_point[1..]),
_ => (true, before_point),
};
let mut hi: i128 = 0;
macro_rules! adjust_hi {
($op:ident) => {{
for digit in digits.chars() {
if digit == '_' {
continue;
}
let digit = digit.to_digit(10)?;
hi = hi.checked_mul(10)?;
hi = hi.$op(digit as _)?;
}
}};
}
if is_pos {
adjust_hi!(checked_add);
} else {
adjust_hi!(checked_sub);
}
match hi.checked_mul(Self::ONE_POINT_ZERO) {
Some(hi) => hi.checked_add(lo).map(|num| Self(num.to_ne_bytes())),
None => None,
}
}