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use unicode_segmentation::UnicodeSegmentation;
fn isvowel(s: &str) -> bool {
match s {
"A" | "E" | "I" | "O" | "U" => true,
_ => false,
}
}
pub fn nysiis(s: &str) -> String {
if s.len() == 0 {
return String::from("");
}
let s = &s.to_uppercase()[..];
let mut v = UnicodeSegmentation::graphemes(s, true).collect::<Vec<&str>>();
if s.starts_with("MAC") {
v[1] = "C";
} else if s.starts_with("KN") {
v.remove(0);
} else if s.starts_with("K") {
v[0] = "C";
} else if s.starts_with("PH") || s.starts_with("PF") {
v[0] = "F";
v[1] = "F";
} else if s.starts_with("SCH") {
v[1] = "S";
v[2] = "S";
}
if s.ends_with("IE") || s.ends_with("EE") {
v.pop();
v.pop();
v.push("Y");
} else if s.ends_with("DT")
|| s.ends_with("RT")
|| s.ends_with("RD")
|| s.ends_with("NT")
|| s.ends_with("ND")
{
v.pop();
v.pop();
v.push("D");
}
let mut key = Vec::new();
key.push(v[0]);
let mut i = 1;
while i < v.len() {
let chars = match v[i] {
"E" if i + 1 < v.len() && v[i + 1] == "V" => {
i += 1;
vec!["A", "F"]
}
"A" | "E" | "I" | "O" | "U" => vec!["A"],
"Q" => vec!["G"],
"Z" => vec!["S"],
"M" => vec!["N"],
"K" => {
if i + 1 < v.len() && v[i + 1] == "N" {
vec!["N"]
} else {
vec!["C"]
}
}
"S" if i + 2 < v.len() && v[i + 1] == "C" && v[i + 2] == "H" => {
i += 2;
vec!["S", "S"]
}
"P" if i + 1 < v.len() && v[i + 1] == "H" => {
i += 1;
vec!["F"]
}
"H" if !isvowel(v[i - 1])
|| (i + 1 < v.len() && !isvowel(v[i + 1]))
|| (i + 1 == v.len()) =>
{
if isvowel(v[i - 1]) {
vec!["A"]
} else {
vec![v[i - 1]]
}
}
"W" if isvowel(v[i - 1]) => vec![v[i - 1]],
_ => vec![v[i]],
};
if chars.len() > 0 && chars[chars.len() - 1] != key[key.len() - 1] {
for c in chars {
key.push(c);
}
}
println!("step 4: {:?}, {:?}", v[i], key);
i += 1;
}
if key[key.len() - 1] == "S" && key.len() > 1 {
key.pop();
}
if key.ends_with(&["A", "Y"]) {
key.remove(key.len() - 2);
}
if key[key.len() - 1] == "A" && key.len() > 1 {
key.pop();
}
let mut str_key = String::new();
for k in key {
str_key.push_str(k);
}
return str_key;
}
#[cfg(test)]
mod test {
use super::*;
use crate::testutils::testutils;
#[test]
fn test_nysiis() {
testutils::test_str_func("testdata/nysiis.csv", nysiis);
}
}