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use std::cmp::Ordering;
use serde::{Deserialize, Serialize};
#[derive(Debug, Eq, PartialEq, Hash, Clone, Default, Serialize, Deserialize)]
#[serde(into = "String", from = "CharsetSerializedEnum")]
pub struct Charset(pub Vec<char>);
impl Charset {
pub fn new<S: AsRef<str>>(s: S) -> Self {
let mut chars = s.as_ref().chars().collect::<Vec<_>>();
chars.sort();
chars.dedup();
Self(chars)
}
pub fn from_iter<S: IntoIterator<Item = char>>(s: S) -> Self {
let mut chars = s.into_iter().collect::<Vec<_>>();
chars.sort();
chars.dedup();
Self(chars)
}
pub fn iter(&self) -> impl Iterator<Item = char> + '_ {
self.0.iter().copied()
}
pub fn intersects(&self, other: &Self) -> bool {
let mut it1 = self.0.iter().peekable();
let mut it2 = other.0.iter().peekable();
while let (Some(c1), Some(c2)) = (it1.peek(), it2.peek()) {
match c1.cmp(c2) {
Ordering::Equal => return true,
Ordering::Less => it1.next(),
Ordering::Greater => it2.next(),
};
}
false
}
pub fn inter_len(&self, other: &Self) -> usize {
if other.len() > 20 * self.len() {
// alternative path
return self
.0
.iter()
.filter(|x| other.0.binary_search(x).is_ok())
.count();
}
let mut it1 = self.0.iter().peekable();
let mut it2 = other.0.iter().peekable();
let mut ret = 0;
while let (Some(c1), Some(c2)) = (it1.peek(), it2.peek()) {
match c1.cmp(c2) {
Ordering::Equal => {
ret += 1;
it1.next();
it2.next();
}
Ordering::Less => {
it1.next();
}
Ordering::Greater => {
it2.next();
}
};
}
ret
}
pub fn inter(&self, other: &Self) -> Charset {
let mut it1 = self.0.iter().peekable();
let mut it2 = other.0.iter().peekable();
let mut ret = Vec::new();
while let (Some(c1), Some(c2)) = (it1.peek(), it2.peek()) {
match c1.cmp(c2) {
Ordering::Equal => {
ret.push(**c1);
it1.next();
it2.next();
}
Ordering::Less => {
it1.next();
}
Ordering::Greater => {
it2.next();
}
};
}
Self(ret)
}
pub fn union(&self, other: &Self) -> Charset {
let mut it1 = self.0.iter().peekable();
let mut it2 = other.0.iter().peekable();
let mut ret = Vec::new();
while let (Some(c1), Some(c2)) = (it1.peek(), it2.peek()) {
match c1.cmp(c2) {
Ordering::Equal => {
ret.push(**c1);
it1.next();
it2.next();
}
Ordering::Less => {
ret.push(**c1);
it1.next();
}
Ordering::Greater => {
ret.push(**c2);
it2.next();
}
};
}
while let Some(c) = it1.peek() {
ret.push(**c);
it1.next();
}
while let Some(c) = it2.peek() {
ret.push(**c);
it2.next();
}
Self(ret)
}
pub fn diff(&self, other: &Self) -> Charset {
let mut it1 = self.0.iter().peekable();
let mut it2 = other.0.iter().peekable();
let mut ret = Vec::new();
while let (Some(c1), Some(c2)) = (it1.peek(), it2.peek()) {
match c1.cmp(c2) {
Ordering::Equal => {
it1.next();
it2.next();
}
Ordering::Less => {
ret.push(**c1);
it1.next();
}
Ordering::Greater => {
it2.next();
}
};
}
while let Some(c) = it1.peek() {
ret.push(**c);
it1.next();
}
Self(ret)
}
pub fn len(&self) -> usize {
self.0.len()
}
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
pub fn chars(&self) -> &[char] {
&self.0
}
pub fn contains(&self, c: char) -> bool {
self.0.binary_search(&c).is_ok()
}
pub fn to_string(&self) -> String {
self.0.iter().collect::<String>()
}
}
impl Into<String> for Charset {
fn into(self) -> String {
self.to_string()
}
}
#[derive(Deserialize)]
#[serde(untagged)]
enum CharsetSerializedEnum {
Array(Vec<char>),
Str(String),
}
impl From<CharsetSerializedEnum> for Charset {
fn from(s: CharsetSerializedEnum) -> Charset {
match s {
CharsetSerializedEnum::Array(a) => Charset::from_iter(a.into_iter()),
CharsetSerializedEnum::Str(s) => Charset::new(&s),
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_charset() {
let c1 = Charset::new("azerty");
let c2 = Charset::new("uiopqsqdf");
let c3 = Charset::new("hello, world");
assert!(!c1.intersects(&c2));
assert!(c1.intersects(&c3));
assert!(c2.intersects(&c3));
assert_eq!(c1.inter_len(&c2), 0);
assert_eq!(c1.inter_len(&c3), 2);
assert_eq!(c2.inter_len(&c3), 2);
assert_eq!(c1.inter(&c2), Charset::new(""));
assert_eq!(c1.inter(&c3), Charset::new("er"));
assert_eq!(c2.inter(&c3), Charset::new("od"));
assert_eq!(c1.union(&c2), Charset::new("azertyuiopqsdf"));
assert_eq!(c1.union(&c3), Charset::new("azertyhello, world"));
assert_eq!(c2.union(&c3), Charset::new("uiopqsdfhello, world"));
assert_eq!(c1.diff(&c2), Charset::new("azerty"));
assert_eq!(c1.diff(&c3), Charset::new("azty"));
assert_eq!(c2.diff(&c3), Charset::new("uipqsf"));
assert_eq!(c2.diff(&c1), Charset::new("uiopqsdf"));
assert_eq!(c3.diff(&c1), Charset::new("hllo, wold"));
assert_eq!(c3.diff(&c2), Charset::new("hell, wrl"));
}
}
|
