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const CONSONANTS: &str = "bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ";
const VOWELS: &str = "aeiouyAEIOUY";
fn stem(word: &str) -> (String, String) {
let start = word
.chars()
.take_while(|c| CONSONANTS.contains(*c))
.collect::<String>();
let end = word.chars().skip(start.len()).collect::<String>();
(start, end)
}
fn stem2(word: &str) -> (&str, &str) {
let pattern = |c: char| VOWELS.contains(c);
let index = word.find(pattern).unwrap_or(0);
(&word[0..index], &word[index..])
}
pub fn zummi_naive(phrase: &str) -> Option<String> {
let mut words = phrase.split_whitespace();
let (first, second) = (words.next(), words.next());
if let (Some(first), Some(second)) = (first, second) {
let (f, irst) = stem(first);
let (s, econd) = stem(second);
Some(s + &irst + " " + &f + &econd)
} else {
None
}
}
pub fn zummi_broke(phrase: &str) -> Option<String> {
let mut words = phrase.split_whitespace();
let (first, second) = (words.next(), words.next());
if let (Some(first), Some(second)) = (first, second) {
let (f, irst) = stem2(first);
let (s, econd) = stem2(second);
let capacity = f.len() + irst.len() + s.len() + econd.len();
let spoonerism = String::with_capacity(capacity) + s + irst + " " + f + econd;
Some(spoonerism)
} else {
None
}
}
pub fn zummi(phrase: &str) -> Option<String> {
let mut words = phrase.split_whitespace();
let (first, second) = (words.next(), words.next());
if let (Some(first), Some(second)) = (first, second) {
let (f, irst) = stem2(first);
let (s, econd) = stem2(second);
let capacity = f.len() + irst.len() + s.len() + econd.len() + " ".len();
let spoonerism = String::with_capacity(capacity) + s + irst + " " + f + econd;
Some(spoonerism)
} else {
None
}
}