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use std::collections::HashSet;
use std::iter::FromIterator;
static KEYBOARDS: [&str; 2] = [
"abcdefghijklmnopqrstuvwxyz",
"abcdefghijklmnopqrstuvwxyzñõàèìòùäëïöüÿâêîôû",
];
static KEYBOARD_VOWELS: [&str; 2] = [
"aeiouy",
"aeiouyõàèìòùäëïöüÿâêîôû",
];
static KEYBOARD_CONSONANTS: [&str; 2] = [
"bcdfghjklmnpqrstvwxz",
"bcdfghjklmnpqrstvwxzñ",
];
pub fn detect_keyboard(s: &str) -> usize {
let mut best = (0, 0);
for ki in 0..KEYBOARDS.len() {
let count_contains = s.chars().filter(|c| KEYBOARDS[ki].contains(*c)).count();
if count_contains==s.len() {
return ki;
}
if best.1 < count_contains {
best = (ki, count_contains);
}
}
best.0
}
pub fn detect_keyboard_layout(s: &str) -> &str {
KEYBOARDS[detect_keyboard(s)]
}
pub fn detect_keyboard_vowels(s: &str) -> &str {
KEYBOARD_VOWELS[detect_keyboard(s)]
}
pub fn detect_keyboard_consonants(s: &str) -> &str {
KEYBOARD_CONSONANTS[detect_keyboard(s)]
}
pub fn variant_mistakes(s: &str) -> Vec<String> {
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
for oi in 0..s.len() {
let c = s[oi];
let cs = cjk::variants(c);
for ct in cs.iter() {
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), ct, String::from_iter(&s[oi+1..])));
}
}
ts
}
pub fn slur_mistakes(s: &str) -> Vec<String> {
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
for oi in 0..s.len() {
if oi+2 <= s.len() {
ts.push(format!("{}{}", String::from_iter(&s[..oi]), String::from_iter(&s[oi+2..])));
}
if oi+3 <= s.len() {
ts.push(format!("{}{}", String::from_iter(&s[..oi]), String::from_iter(&s[oi+3..])));
}
}
ts
}
pub fn ateji_mistakes(s: &str) -> Vec<String> {
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
for oi in 0..s.len() {
let c = s[oi];
if let Some(cs) = cjk::JOUYOU_ATEJI_INDEX.get(&c) {
for ct in cs.iter() {
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), ct, String::from_iter(&s[oi+1..])));
}
}
}
ts
}
pub fn contraction_mistakes(s: &str) -> Vec<String> {
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
if let Some(ai) = s.iter().position(|&c| c=='\'') {
if ai > 0 {
ts.push(format!("{}{}", String::from_iter(&s[..ai-1]), String::from_iter(&s[ai..])));
ts.push(format!("{}{}{}", String::from_iter(&s[..ai]), &s[ai-1], String::from_iter(&s[ai..])));
}
if ai+2 <= s.len() {
ts.push(format!("{}{}", String::from_iter(&s[..ai+1]), String::from_iter(&s[ai+2..])));
ts.push(format!("{}{}{}", String::from_iter(&s[..ai+1]), &s[ai+1], String::from_iter(&s[ai+1..])));
ts.push(format!("{}{}{}{}", String::from_iter(&s[..ai]), &s[ai+1], "'", String::from_iter(&s[ai+2..])));
}
if ai > 0 && ai+1 <= s.len() {
ts.push(format!("{}{}{}{}", String::from_iter(&s[..ai-1]), "'", &s[ai-1], String::from_iter(&s[ai+1..])));
}
}
ts
}
pub fn consonant_mistakes(s: &str) -> Vec<String> {
let kb = detect_keyboard_consonants(s);
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
for oi in 0..s.len() {
if !kb.contains(s[oi]) { continue; }
ts.push(format!("{}{}", String::from_iter(&s[..oi]), String::from_iter(&s[oi+1..])));
for k in kb.chars() {
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), k, String::from_iter(&s[oi+1..])));
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), k, String::from_iter(&s[oi..])));
ts.push(format!("{}{}{}", String::from_iter(&s[..oi+1]), k, String::from_iter(&s[oi+1..])));
}
}
ts
}
pub fn vowel_mistakes(s: &str) -> Vec<String> {
let kb = detect_keyboard_vowels(s);
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
for oi in 0..s.len() {
if !kb.contains(s[oi]) { continue; }
ts.push(format!("{}{}", String::from_iter(&s[..oi]), String::from_iter(&s[oi+1..])));
for k1 in kb.chars() {
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), k1, String::from_iter(&s[oi+1..])));
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), k1, String::from_iter(&s[oi..])));
ts.push(format!("{}{}{}", String::from_iter(&s[..oi+1]), k1, String::from_iter(&s[oi+1..])));
for k2 in kb.chars() {
ts.push(format!("{}{}{}{}", String::from_iter(&s[..oi]), k1, k2, String::from_iter(&s[oi..])));
}
}
}
ts
}
pub fn typos(s: &str) -> Vec<String> {
let kb = detect_keyboard_layout(s);
let s = s.chars().collect::<Vec<char>>();
let mut ts = Vec::new();
for oi in 0..s.len() {
ts.push(format!("{}{}", String::from_iter(&s[..oi]), String::from_iter(&s[oi+1..])));
}
for oi in 0..s.len() {
if oi+1 < s.len() {
ts.push(format!("{}{}{}{}", String::from_iter(&s[..oi]), s[oi+1], s[oi], String::from_iter(&s[oi+2..])));
}
if oi+2 < s.len() {
ts.push(format!("{}{}{}{}{}", String::from_iter(&s[..oi]), s[oi+1], s[oi], s[oi+2], String::from_iter(&s[oi+3..])));
ts.push(format!("{}{}{}{}{}", String::from_iter(&s[..oi]), s[oi+1], s[oi+2], s[oi], String::from_iter(&s[oi+3..])));
ts.push(format!("{}{}{}{}{}", String::from_iter(&s[..oi]), s[oi+2], s[oi], s[oi+1], String::from_iter(&s[oi+3..])));
ts.push(format!("{}{}{}{}{}", String::from_iter(&s[..oi]), s[oi+2], s[oi+1], s[oi], String::from_iter(&s[oi+3..])));
}
}
for oi in 0..s.len() {
for k in kb.chars() {
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), k, String::from_iter(&s[oi+1..])));
}
}
for oi in 0..s.len() {
for k in kb.chars() {
ts.push(format!("{}{}{}", String::from_iter(&s[..oi]), k, String::from_iter(&s[oi..])));
}
}
ts
}
pub fn misspell(s: &str) -> HashSet<String> {
let mut ms = HashSet::new();
for w in typos(s).into_iter() {
ms.insert(w);
}
for w in vowel_mistakes(s).into_iter() {
ms.insert(w);
}
for w in consonant_mistakes(s).into_iter() {
ms.insert(w);
}
for w in contraction_mistakes(s).into_iter() {
ms.insert(w);
}
for w in ateji_mistakes(s).into_iter() {
ms.insert(w);
}
for w in variant_mistakes(s).into_iter() {
ms.insert(w);
}
for w in slur_mistakes(s).into_iter() {
ms.insert(w);
}
if ms.contains(s) {
ms.remove(s);
}
ms
}