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51 lines
1.4 KiB
51 lines
1.4 KiB
use wana_kana::{ConvertJapanese, IsJapaneseStr};
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pub fn get_starting_mora(word: &str) -> String {
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if word.is_empty() {
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return String::from("");
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}
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let word = word.to_hiragana();
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let mut iter = word.chars();
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let starting_char = iter.next().unwrap();
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let second_char = iter.next().unwrap();
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match second_char {
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'ゃ' | 'ゅ' | 'ょ' => format!("{starting_char}{second_char}"),
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_ => starting_char.to_string(),
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}
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}
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// Trim off lengtheners and non-kana that are irrelevant to shiritori
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// TODO: Use slices
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fn trim_irrelevant_chars(word: &str) -> String {
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let mut iter = word.chars().rev().peekable();
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while let Some(c) = iter.peek() {
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if *c == 'ー' || !c.to_string().is_kana() {
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iter.next();
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} else {
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break;
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}
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}
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iter.rev().collect()
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}
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// Get final mora, which could be multiple chars e.g. しゃ
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// TODO: Use slices
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pub fn get_final_mora(word: &str) -> String {
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let word = trim_irrelevant_chars(word).to_hiragana();
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if word.is_empty() {
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return String::from("");
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}
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let mut iter = word.chars().rev();
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let final_char = iter.next().unwrap();
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match final_char {
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'ゃ' | 'ゅ' | 'ょ' => format!(
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"{}{final_char}",
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match iter.next() {
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Some(c) => c.to_string(),
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None => String::from(""),
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}
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),
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_ => final_char.to_string(),
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}
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}
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