1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

use std::fmt::Display;

use crate::{alphabet, umlaut::Umlaut};

/// One single syllable within the a kana alphabet
#[derive(Debug, PartialEq, Clone, Copy)]
pub struct Syllable(char);

#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Info {
    pub row: Row,
    pub umlaut: Umlaut,
}

/// A kana row
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Row {
    /// あ,え,い,お,う
    Umlauts,
    /// ん
    NSpecial,
    K,
    G,
    S,
    Z,
    T,
    D,
    N,
    H,
    B,
    P,
    M,
    R,
    Y,
    W,
}

impl From<char> for Syllable {
    fn from(c: char) -> Self {
        Self(c)
    }
}

impl Into<char> for Syllable {
    fn into(self) -> char {
        self.get_char()
    }
}

impl From<&str> for Syllable {
    fn from(s: &str) -> Self {
        s.chars().next().unwrap().into()
    }
}

impl Display for Syllable {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.get_char())
    }
}

impl Syllable {
    /// Returns `true` if the syllable ends with or equals a given Umlaut
    ///
    /// # Examples
    /// ```
    /// use jp_inflections::syllable::Syllable;
    /// use jp_inflections::umlaut::Umlaut;
    ///
    /// assert!(Syllable::from("が").ends_with(Umlaut::A));
    /// assert!(!Syllable::from('ぬ').ends_with(Umlaut::A));
    /// ```
    pub fn ends_with<U: Into<Umlaut>>(&self, u: U) -> bool {
        self.get_info()
            .map(|i| i.umlaut == u.into())
            .unwrap_or_default()
    }

    /// Returns an `Some(Info)` based on the syllable, or None if its not a valid syllable
    /// # Examples
    /// ```
    /// use jp_inflections::syllable::{Syllable, Info, Row};
    /// use jp_inflections::umlaut::Umlaut;
    ///
    /// let s = Syllable::from('が');
    /// assert_eq!(s.get_info(), Some(Info { row: Row::G, umlaut: Umlaut::A }));
    /// ```
    pub fn get_info(&self) -> Option<Info> {
        let c = self.0;

        for (row, letters) in alphabet::HIRAGANA_SYLLABLES {
            for (character, umlaut) in *letters {
                if *character == c {
                    return Some(Info {
                        umlaut: *umlaut,
                        row: *row,
                    });
                }
            }
        }

        None
    }

    pub fn to_dakuten(&self) -> Self {
        match self.get_char() {
            'た' => Self::from('だ'),
            'て' => Self::from('で'),
            'ち' => Self::from('ぢ'),
            'と' => Self::from('ど'),
            'つ' => Self::from('づ'),
            'か' => Self::from('が'),
            'け' => Self::from('げ'),
            'き' => Self::from('ぎ'),
            'こ' => Self::from('ご'),
            'く' => Self::from('ぐ'),
            'は' => Self::from('ば'),
            'へ' => Self::from('べ'),
            'ひ' => Self::from('び'),
            'ほ' => Self::from('ぼ'),
            'ふ' => Self::from('ぶ'),
            'さ' => Self::from('ざ'),
            'せ' => Self::from('ぜ'),
            'し' => Self::from('じ'),
            'そ' => Self::from('ぞ'),
            'す' => Self::from('ず'),
            _ => *self,
        }
    }

    /// Returns the charactor hold by [`self`]
    pub fn get_char(&self) -> char {
        self.0
    }

    /// Returns true if the syllable is a valid (hiragana) character
    pub fn is_valid(&self) -> bool {
        self.get_info().is_none()
    }
}