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use {
core::{
ops::Bound,
str::FromStr,
},
crate::{Error, Result, Range, Semver},
};
const MARK_SIZE: usize = 1;
#[derive(Debug)]
enum OpenMark {
Inclusive,
Exclusive,
}
impl OpenMark {
fn make_bound(self, semver: Option<Semver>) -> Result<Bound<Semver>> {
match semver {
None => match self {
OpenMark::Inclusive => Ok(Bound::Unbounded),
OpenMark::Exclusive => Err(err!("Start index of unbounded range must be inclusive")),
},
Some(semver) => match self {
OpenMark::Inclusive => Ok(Bound::Included(semver)),
OpenMark::Exclusive => Ok(Bound::Excluded(semver)),
},
}
}
}
#[derive(Debug)]
enum CloseMark {
Inclusive,
Exclusive,
}
impl CloseMark {
fn make_bound(self, semver: Option<Semver>) -> Result<Bound<Semver>> {
match semver {
None => match self {
CloseMark::Inclusive => Ok(Bound::Unbounded),
CloseMark::Exclusive => Err(err!("End index of unbounded range must be inclusive")),
},
Some(semver) => match self {
CloseMark::Inclusive => Ok(Bound::Included(semver)),
CloseMark::Exclusive => Ok(Bound::Excluded(semver)),
},
}
}
}
#[test]
fn test_mark() {
for c in &[
crate::range::INCLUSIVE_OPEN,
crate::range::INCLUSIVE_CLOSE,
crate::range::EXCLUSIVE_OPEN,
crate::range::EXCLUSIVE_CLOSE,
] {
assert_eq!(c.len_utf8(), MARK_SIZE);
}
}
impl FromStr for Range {
type Err = Error;
fn from_str(s: &str) -> core::result::Result<Self, Self::Err> {
#[cfg(target_pointer_width = "8")]
const MAX_LEN: usize = 255;
#[cfg(not(target_pointer_width = "8"))]
const MAX_LEN: usize = 4096;
if s.len() > MAX_LEN {
return Err(err!("String is too long, max length supported: {} bytes", MAX_LEN));
}
let err = || err!("Invalid range: {:?}", s);
let open_mark = match s.chars().next() {
Some(crate::range::INCLUSIVE_OPEN) => OpenMark::Inclusive,
Some(crate::range::EXCLUSIVE_OPEN) => OpenMark::Exclusive,
_ => return Err(err()),
};
let close_mark = if s.ends_with(crate::range::INCLUSIVE_CLOSE) {
CloseMark::Inclusive
} else if s.ends_with(crate::range::EXCLUSIVE_CLOSE) {
CloseMark::Exclusive
} else {
return Err(err());
};
let mut parts = s[MARK_SIZE .. s.len() - MARK_SIZE].trim().split(',').map(|s| s.trim());
let start = match parts.next() {
None => return Err(err()),
Some(start) => open_mark.make_bound(if start.is_empty() { None } else { Some(Semver::from_str(start).map_err(|_| err())?) })?,
};
let end = match parts.next() {
None => return Err(err()),
Some(end) => close_mark.make_bound(if end.is_empty() { None } else { Some(Semver::from_str(end).map_err(|_| err())?) })?,
};
if parts.next().is_none() {
Ok(Self { start, end })
} else {
Err(err())
}
}
}
