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seq: Adds hexadecimal integer parsing

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This commit is contained in:
vulppine 2021-10-02 08:15:25 -07:00
parent 01d098993b
commit d5caa0d9d8
1 changed files with 61 additions and 15 deletions
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76
src/uu/seq/src/seq.rs
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@ -88,30 +88,76 @@ impl FromStr for Number {
if s.starts_with('+') {
s = &s[1..];
}
match s.parse::<BigInt>() {
Ok(n) => {
// If `s` is '-0', then `parse()` returns
// `BigInt::zero()`, but we need to return
// `Number::MinusZero` instead.
if n == BigInt::zero() && s.starts_with('-') {
Ok(Number::MinusZero)
} else {
Ok(Number::BigInt(n))
}
let is_neg = s.starts_with('-');
let is_hex = {
// GNU 20.11.2 - Parsing of Floats
match s.find("0x") {
Some(i) => (true, i),
None => match s.find("0X") {
Some(i) => (true, i),
None => (false, 0),
},
}
Err(_) => match s.parse::<f64>() {
Ok(value) if value.is_nan() => Err(format!(
};
match is_hex {
(true, i) => match i <= 1 {
false => Err(format!(
"invalid hexadecimal argument: {}\nTry '{} --help' for more information.",
s.quote(),
uucore::execution_phrase(),
)),
true => match &s.as_bytes()[i + 2] {
b'-' | b'+' => Err(format!(
"invalid hexadecimal argument: {}\nTry '{} --help' for more information.",
s.quote(),
uucore::execution_phrase(),
)),
// TODO: hexadecimal floating point parsing (see #2660)
b'.' => Err(format!(
"NotImplemented: hexadecimal floating point numbers: {}\nTry '{} --help' for more information.",
s.quote(),
uucore::execution_phrase(),
)),
_ => {
let num = BigInt::from_str_radix(&s[i + 2..], 16)
.map_err(|_| format!(
"invalid hexadecimal argument: {}\nTry '{} --help' for more information.",
s.quote(),
uucore::execution_phrase(),
))?;
match (is_neg, num == BigInt::zero()) {
(true, true) => Ok(Number::MinusZero),
(true, false) => Ok(Number::BigInt(-num)),
(false, _) => Ok(Number::BigInt(num)),
}
}
},
},
(false, _) => match s.parse::<BigInt>() {
Ok(n) => {
// If `s` is '-0', then `parse()` returns
// `BigInt::zero()`, but we need to return
// `Number::MinusZero` instead.
if n == BigInt::zero() && is_neg {
Ok(Number::MinusZero)
} else {
Ok(Number::BigInt(n))
}
}
Err(_) => match s.parse::<f64>() {
Ok(value) if value.is_nan() => Err(format!(
"invalid 'not-a-number' argument: {}\nTry '{} --help' for more information.",
s.quote(),
uucore::execution_phrase(),
)),
Ok(value) => Ok(Number::F64(value)),
Err(_) => Err(format!(
Ok(value) => Ok(Number::F64(value)),
Err(_) => Err(format!(
"invalid floating point argument: {}\nTry '{} --help' for more information.",
s.quote(),
uucore::execution_phrase(),
)),
},
},
}
}