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|
use std::ops::RangeInclusive;
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct ByteRange {
/// inclusive
from: u8,
/// inclusive
to: u8,
}
impl From<RangeInclusive<u8>> for ByteRange {
fn from(value: RangeInclusive<u8>) -> Self {
Self::new_range(*value.start(), *value.end())
}
}
impl ByteRange {
pub fn new_range(from: u8, to: u8) -> Self {
assert!(from <= to, "{from} <= {to}");
Self { from, to }
}
pub fn new_single(c: u8) -> Self {
Self::new_range(c, c)
}
pub fn all() -> Self {
Self::new_range(0, 255)
}
pub fn contains(&self, c: u8) -> bool {
self.from <= c && c <= self.to
}
pub fn overlaps(&self, other: Self) -> bool {
self.from.max(other.from) <= self.to.min(other.to)
}
pub fn split_to_disjoint(ranges: Vec<ByteRange>) -> Vec<ByteRange> {
if ranges.is_empty() {
return vec![];
}
let mut points: Vec<u16> = Vec::new();
for r in &ranges {
points.push(r.from as u16);
points.push((r.to as u16) + 1);
}
points.sort_unstable();
points.dedup();
let mut out = Vec::new();
for window in points.windows(2) {
let start = window[0];
let end_exclusive = window[1];
if start >= end_exclusive {
continue;
}
let mut active = false;
for r in &ranges {
if r.from as u16 <= start && start <= r.to as u16 {
active = true;
break;
}
}
if active {
out.push(ByteRange {
from: start as u8,
to: (end_exclusive - 1) as u8,
});
}
}
out
}
}
#[test]
fn byterange_test() {
assert_eq!(
ByteRange::split_to_disjoint(vec![
ByteRange::new_range(b'a', b'z'),
ByteRange::new_single(b'm')
]),
vec![
ByteRange::new_range(b'a', b'l'),
ByteRange::new_single(b'm'),
ByteRange::new_range(b'n', b'z'),
]
);
}
#[test]
fn byterange_test_0_128() {
assert_eq!(
ByteRange::split_to_disjoint(vec![ByteRange::new_range(0, 128)]),
vec![ByteRange::new_range(0, 128)]
);
}
#[test]
fn byterange_test_0_255() {
assert_eq!(
ByteRange::split_to_disjoint(vec![ByteRange::new_range(0, 255)]),
vec![ByteRange::new_range(0, 255)]
);
}
impl std::fmt::Debug for ByteRange {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if self.from == self.to {
write!(f, "{}", [self.from].escape_ascii())
} else {
write!(
f,
"{}-{}",
[self.from].escape_ascii(),
[self.to].escape_ascii()
)
}
}
}
#[cfg(test)]
mod non_overlapping_tests {
use std::ops::RangeInclusive;
use super::ByteRange;
fn middle(r: ByteRange) -> u8 {
let a = r.from as u8;
let b = r.to as u8;
(a + (b - a) / 2) as u8
}
fn prev(c: u8) -> u8 {
c - 1
}
fn next(c: u8) -> u8 {
c + 1
}
fn run(ranges: Vec<RangeInclusive<u8>>) {
let ranges1: Vec<ByteRange> = ranges.into_iter().map(Into::into).collect();
let ranges2 = ByteRange::split_to_disjoint(ranges1.clone());
let r1 = |c| ranges1.iter().any(|cr| cr.contains(c));
let r2 = |c| ranges2.iter().any(|cr| cr.contains(c));
for &range in ranges1.iter() {
assert!(r1(range.from));
assert!(r1(range.to));
assert!(r1(middle(range)));
assert!(r2(range.from));
assert!(r2(range.to));
assert!(r2(middle(range)));
assert_eq!(r1(prev(range.from)), r2(prev(range.from)));
assert_eq!(r1(next(range.from)), r2(next(range.from)));
}
for i in 0..ranges2.len() {
for j in 0..i {
assert!(
!ranges2[i].overlaps(ranges2[j]),
"{i} and {j} overlap: {:?}, {:?}",
ranges2[i],
ranges2[j]
);
}
}
}
#[test]
fn overlap_correct() {
assert!(ByteRange::new_range(b'a', b'g').overlaps(ByteRange::new_single(b'f')));
assert!(!ByteRange::new_range(b'a', b'g').overlaps(ByteRange::new_single(b'h')));
}
#[test]
fn empty() {
run(vec![]);
}
#[test]
fn singleton() {
run(vec![b'0'..=b'9']);
}
#[test]
fn contained1() {
run(vec![b'0'..=b'9', b'5'..=b'6']);
}
#[test]
fn contained2() {
run(vec![b'5'..=b'6', b'0'..=b'9']);
}
#[test]
fn overlap2() {
run(vec![b'1'..=b'6', b'4'..=b'9'])
}
#[test]
fn overlap3() {
run(vec![b'a'..=b'f', b'd'..=b'j', b'g'..=b'm'])
}
#[test]
fn overlap4() {
run(vec![b'a'..=b'f', b'd'..=b'j', b'g'..=b'm', b'k'..=b'q'])
}
}
|
