//! Converters of troublesome characters included in Japanese texts.
//!
//! * Half-width-kana[半角ｶﾅ;HANKAKU KANA] -> normal Katakana
//! * Wide-alphanumeric[全角英数;ZENKAKU EISU] <-> normal ASCII
//!
//! # Example
//! ```
//! extern crate kana;
//! use kana::*;
//! 
//! fn main() {
//!     let s1 = "ﾏﾂｵ ﾊﾞｼｮｳ ｱﾟ";
//!     assert_eq!("マツオ バショウ ア ゚", half2kana(s1));
//!     assert_eq!("マツオ バショウ ア゚", half2full(s1));
//! 
//!     let s2 = "ひ゜ひ゛んは゛";
//!     assert_eq!("ぴびんば", combine(s2));
//!     assert_eq!("ひ ゚ひ ゙んは ゙", vsmark2combi(s2));
//! 
//!     let s3 = "＃＆Ｒｕｓｔ－１．６！";
//!     assert_eq!("#&Rust-1.6!", wide2ascii(s3));
//! }
//! ```

#[macro_use] extern crate lazy_static;
extern crate regex;

use std::char;
use std::collections::HashMap;
use regex::Regex;

//  0x3099  combining  ゙
//  0x309A  combining  ゚
//  0x309B  fullwidth ゛
//  0x309C  fullwidth ゜
//  0xFF9E  halfwidth ﾞ
//  0xFF9F  halfwidth ﾟ
//  0x20    space

const CH_VOICED_COMBI:     char = '\u{3099}';
const CH_SEMIVOICED_COMBI: char = '\u{309A}';
const CH_VOICED_FULL:      char = '\u{309B}';
const CH_SEMIVOICED_FULL:  char = '\u{309C}';
const CH_VOICED_HALF:      char = '\u{FF9E}';
const CH_SEMIVOICED_HALF:  char = '\u{FF9F}';
const CH_SPACE:            char = '\u{20}';

const VOICED_COMBI:          &'static str = "\u{3099}";
const SEMIVOICED_COMBI:      &'static str = "\u{309A}";
const VOICED_WITH_SPACE:     &'static str = "\u{20}\u{3099}";
const SEMIVOICED_WITH_SPACE: &'static str = "\u{20}\u{309A}";

const RE_VOICED_MARKS: &'static str
    = r"(?:\x20??\x{3099}|\x{309B}|\x{FF9E})";
const RE_SEMIVOICED_MARKS: &'static str
    = r"(?:\x20??\x{309A}|\x{309C}|\x{FF9F})";

lazy_static! {
    static ref SEMIVOICED_HALVES: HashMap<char,char> = [
        ('\u{FF8A}', '\u{30D1}'),   //  ﾊ	FF8A	パ	30D1
        ('\u{FF8B}', '\u{30D4}'),   //  ﾋ	FF8B	ピ	30D4
        ('\u{FF8C}', '\u{30D7}'),   //  ﾌ	FF8C	プ	30D7
        ('\u{FF8D}', '\u{30DA}'),   //  ﾍ	FF8D	ペ	30DA
        ('\u{FF8E}', '\u{30DD}'),   //  ﾎ	FF8E	ポ	30DD
    ].iter().copied().collect();

    static ref VOICED_HALVES: HashMap<char,char> = [
        ('\u{FF66}', '\u{30FA}'),   //  ｦ	FF66	ヺ	30FA
        ('\u{FF73}', '\u{30F4}'),   //  ｳ	FF73	ヴ	30F4
        ('\u{FF76}', '\u{30AC}'),   //  ｶ	FF76	ガ	30AC
        ('\u{FF77}', '\u{30AE}'),   //  ｷ	FF77	ギ	30AE
        ('\u{FF78}', '\u{30B0}'),   //  ｸ	FF78	グ	30B0
        ('\u{FF79}', '\u{30B2}'),   //  ｹ	FF79	ゲ	30B2
        ('\u{FF7A}', '\u{30B4}'),   //  ｺ	FF7A	ゴ	30B4
        ('\u{FF7B}', '\u{30B6}'),   //  ｻ	FF7B	ザ	30B6
        ('\u{FF7C}', '\u{30B8}'),   //  ｼ	FF7C	ジ	30B8
        ('\u{FF7D}', '\u{30BA}'),   //  ｽ	FF7D	ズ	30BA
        ('\u{FF7E}', '\u{30BC}'),   //  ｾ	FF7E	ゼ	30BC
        ('\u{FF7F}', '\u{30BE}'),   //  ｿ	FF7F	ゾ	30BE
        ('\u{FF80}', '\u{30C0}'),   //  ﾀ	FF80	ダ	30C0
        ('\u{FF81}', '\u{30C2}'),   //  ﾁ	FF81	ヂ	30C2
        ('\u{FF82}', '\u{30C5}'),   //  ﾂ	FF82	ヅ	30C5
        ('\u{FF83}', '\u{30C7}'),   //  ﾃ	FF83	デ	30C7
        ('\u{FF84}', '\u{30C9}'),   //  ﾄ	FF84	ド	30C9
        ('\u{FF8A}', '\u{30D0}'),   //  ﾊ	FF8A	バ	30D0
        ('\u{FF8B}', '\u{30D3}'),   //  ﾋ	FF8B	ビ	30D3
        ('\u{FF8C}', '\u{30D6}'),   //  ﾌ	FF8C	ブ	30D6
        ('\u{FF8D}', '\u{30D9}'),   //  ﾍ	FF8D	ベ	30D9
        ('\u{FF8E}', '\u{30DC}'),   //  ﾎ	FF8E	ボ	30DC
        ('\u{FF9C}', '\u{30F7}'),   //  ﾜ	FF9C	ヷ	30F7
    ].iter().copied().collect();

    static ref SEMIVOICES: HashMap<char,char> = [
        ('\u{30CF}', '\u{30D1}'),   //  ハ	30CF	パ	30D1
        ('\u{30D2}', '\u{30D4}'),   //  ヒ	30D2	ピ	30D4
        ('\u{30D5}', '\u{30D7}'),   //  フ	30D5	プ	30D7
        ('\u{30D8}', '\u{30DA}'),   //  ヘ	30D8	ペ	30DA
        ('\u{30DB}', '\u{30DD}'),   //  ホ	30DB	ポ	30DD
        ('\u{306F}', '\u{3071}'),   //  は	306F	ぱ	3071
        ('\u{3072}', '\u{3074}'),   //  ひ	3072	ぴ	3074
        ('\u{3075}', '\u{3077}'),   //  ふ	3075	ぷ	3077
        ('\u{3078}', '\u{307A}'),   //  へ	3078	ぺ	307A
        ('\u{307B}', '\u{307D}'),   //  ほ	307B	ぽ	307D
    ].iter().copied().collect();

    static ref VOICES: HashMap<char,char> = [
        ('\u{30A6}', '\u{30F4}'),   //  ウ	30A6	ヴ	30F4
        ('\u{30AB}', '\u{30AC}'),   //  カ	30AB	ガ	30AC
        ('\u{30AD}', '\u{30AE}'),   //  キ	30AD	ギ	30AE
        ('\u{30AF}', '\u{30B0}'),   //  ク	30AF	グ	30B0
        ('\u{30B1}', '\u{30B2}'),   //  ケ	30B1	ゲ	30B2
        ('\u{30B3}', '\u{30B4}'),   //  コ	30B3	ゴ	30B4
        ('\u{30B5}', '\u{30B6}'),   //  サ	30B5	ザ	30B6
        ('\u{30B7}', '\u{30B8}'),   //  シ	30B7	ジ	30B8
        ('\u{30B9}', '\u{30BA}'),   //  ス	30B9	ズ	30BA
        ('\u{30BB}', '\u{30BC}'),   //  セ	30BB	ゼ	30BC
        ('\u{30BD}', '\u{30BE}'),   //  ソ	30BD	ゾ	30BE
        ('\u{30BF}', '\u{30C0}'),   //  タ	30BF	ダ	30C0
        ('\u{30C1}', '\u{30C2}'),   //  チ	30C1	ヂ	30C2
        ('\u{30C4}', '\u{30C5}'),   //  ツ	30C4	ヅ	30C5
        ('\u{30C6}', '\u{30C7}'),   //  テ	30C6	デ	30C7
        ('\u{30C8}', '\u{30C9}'),   //  ト	30C8	ド	30C9
        ('\u{30CF}', '\u{30D0}'),   //  ハ	30CF	バ	30D0
        ('\u{30D2}', '\u{30D3}'),   //  ヒ	30D2	ビ	30D3
        ('\u{30D5}', '\u{30D6}'),   //  フ	30D5	ブ	30D6
        ('\u{30D8}', '\u{30D9}'),   //  ヘ	30D8	ベ	30D9
        ('\u{30DB}', '\u{30DC}'),   //  ホ	30DB	ボ	30DC
        ('\u{30EF}', '\u{30F7}'),   //  ワ	30EF	ヷ	30F7
        ('\u{30F0}', '\u{30F8}'),   //  ヰ	30F0	ヸ	30F8
        ('\u{30F1}', '\u{30F9}'),   //  ヱ	30F1	ヹ	30F9
        ('\u{30F2}', '\u{30FA}'),   //  ヲ	30F2	ヺ	30FA
        ('\u{3046}', '\u{3094}'),   //  う	3046	ゔ	3094
        ('\u{304B}', '\u{304C}'),   //  か	304B	が	304C
        ('\u{304D}', '\u{304E}'),   //  き	304D	ぎ	304E
        ('\u{304F}', '\u{3050}'),   //  く	304F	ぐ	3050
        ('\u{3051}', '\u{3052}'),   //  け	3051	げ	3052
        ('\u{3053}', '\u{3054}'),   //  こ	3053	ご	3054
        ('\u{3055}', '\u{3056}'),   //  さ	3055	ざ	3056
        ('\u{3057}', '\u{3058}'),   //  し	3057	じ	3058
        ('\u{3059}', '\u{305A}'),   //  す	3059	ず	305A
        ('\u{305B}', '\u{305C}'),   //  せ	305B	ぜ	305C
        ('\u{305D}', '\u{305E}'),   //  そ	305D	ぞ	305E
        ('\u{305F}', '\u{3060}'),   //  た	305F	だ	3060
        ('\u{3061}', '\u{3062}'),   //  ち	3061	ぢ	3062
        ('\u{3064}', '\u{3065}'),   //  つ	3064	づ	3065
        ('\u{3066}', '\u{3067}'),   //  て	3066	で	3067
        ('\u{3068}', '\u{3069}'),   //  と	3068	ど	3069
        ('\u{306F}', '\u{3070}'),   //  は	306F	ば	3070
        ('\u{3072}', '\u{3073}'),   //  ひ	3072	び	3073
        ('\u{3075}', '\u{3076}'),   //  ふ	3075	ぶ	3076
        ('\u{3078}', '\u{3079}'),   //  へ	3078	べ	3079
        ('\u{307B}', '\u{307C}'),   //  ほ	307B	ぼ	307C
        ('\u{309D}', '\u{309E}'),   //  ゝ	309D	ゞ	309E
    ].iter().copied().collect();

    static ref HALVES: HashMap<char,char> = [
        ('\u{FF61}', '\u{3002}'),   //  ｡	FF61	。	3002
        ('\u{FF62}', '\u{300C}'),   //  ｢	FF62	「	300C
        ('\u{FF63}', '\u{300D}'),   //  ｣	FF63	」	300D
        ('\u{FF64}', '\u{3001}'),   //  ､	FF64	、	3001
        ('\u{FF65}', '\u{30FB}'),   //  ･	FF65	・	30FB
        ('\u{FF66}', '\u{30F2}'),   //  ｦ	FF66	ヲ	30F2
        ('\u{FF67}', '\u{30A1}'),   //  ｧ	FF67	ァ	30A1
        ('\u{FF68}', '\u{30A3}'),   //  ｨ	FF68	ィ	30A3
        ('\u{FF69}', '\u{30A5}'),   //  ｩ	FF69	ゥ	30A5
        ('\u{FF6A}', '\u{30A7}'),   //  ｪ	FF6A	ェ	30A7
        ('\u{FF6B}', '\u{30A9}'),   //  ｫ	FF6B	ォ	30A9
        ('\u{FF6C}', '\u{30E3}'),   //  ｬ	FF6C	ャ	30E3
        ('\u{FF6D}', '\u{30E5}'),   //  ｭ	FF6D	ュ	30E5
        ('\u{FF6E}', '\u{30E7}'),   //  ｮ	FF6E	ョ	30E7
        ('\u{FF6F}', '\u{30C3}'),   //  ｯ	FF6F	ッ	30C3
        ('\u{FF70}', '\u{30FC}'),   //  ｰ	FF70	ー	30FC
        ('\u{FF71}', '\u{30A2}'),   //  ｱ	FF71	ア	30A2
        ('\u{FF72}', '\u{30A4}'),   //  ｲ	FF72	イ	30A4
        ('\u{FF73}', '\u{30A6}'),   //  ｳ	FF73	ウ	30A6
        ('\u{FF74}', '\u{30A8}'),   //  ｴ	FF74	エ	30A8
        ('\u{FF75}', '\u{30AA}'),   //  ｵ	FF75	オ	30AA
        ('\u{FF76}', '\u{30AB}'),   //  ｶ	FF76	カ	30AB
        ('\u{FF77}', '\u{30AD}'),   //  ｷ	FF77	キ	30AD
        ('\u{FF78}', '\u{30AF}'),   //  ｸ	FF78	ク	30AF
        ('\u{FF79}', '\u{30B1}'),   //  ｹ	FF79	ケ	30B1
        ('\u{FF7A}', '\u{30B3}'),   //  ｺ	FF7A	コ	30B3
        ('\u{FF7B}', '\u{30B5}'),   //  ｻ	FF7B	サ	30B5
        ('\u{FF7C}', '\u{30B7}'),   //  ｼ	FF7C	シ	30B7
        ('\u{FF7D}', '\u{30B9}'),   //  ｽ	FF7D	ス	30B9
        ('\u{FF7E}', '\u{30BB}'),   //  ｾ	FF7E	セ	30BB
        ('\u{FF7F}', '\u{30BD}'),   //  ｿ	FF7F	ソ	30BD
        ('\u{FF80}', '\u{30BF}'),   //  ﾀ	FF80	タ	30BF
        ('\u{FF81}', '\u{30C1}'),   //  ﾁ	FF81	チ	30C1
        ('\u{FF82}', '\u{30C4}'),   //  ﾂ	FF82	ツ	30C4
        ('\u{FF83}', '\u{30C6}'),   //  ﾃ	FF83	テ	30C6
        ('\u{FF84}', '\u{30C8}'),   //  ﾄ	FF84	ト	30C8
        ('\u{FF85}', '\u{30CA}'),   //  ﾅ	FF85	ナ	30CA
        ('\u{FF86}', '\u{30CB}'),   //  ﾆ	FF86	ニ	30CB
        ('\u{FF87}', '\u{30CC}'),   //  ﾇ	FF87	ヌ	30CC
        ('\u{FF88}', '\u{30CD}'),   //  ﾈ	FF88	ネ	30CD
        ('\u{FF89}', '\u{30CE}'),   //  ﾉ	FF89	ノ	30CE
        ('\u{FF8A}', '\u{30CF}'),   //  ﾊ	FF8A	ハ	30CF
        ('\u{FF8B}', '\u{30D2}'),   //  ﾋ	FF8B	ヒ	30D2
        ('\u{FF8C}', '\u{30D5}'),   //  ﾌ	FF8C	フ	30D5
        ('\u{FF8D}', '\u{30D8}'),   //  ﾍ	FF8D	ヘ	30D8
        ('\u{FF8E}', '\u{30DB}'),   //  ﾎ	FF8E	ホ	30DB
        ('\u{FF8F}', '\u{30DE}'),   //  ﾏ	FF8F	マ	30DE
        ('\u{FF90}', '\u{30DF}'),   //  ﾐ	FF90	ミ	30DF
        ('\u{FF91}', '\u{30E0}'),   //  ﾑ	FF91	ム	30E0
        ('\u{FF92}', '\u{30E1}'),   //  ﾒ	FF92	メ	30E1
        ('\u{FF93}', '\u{30E2}'),   //  ﾓ	FF93	モ	30E2
        ('\u{FF94}', '\u{30E4}'),   //  ﾔ	FF94	ヤ	30E4
        ('\u{FF95}', '\u{30E6}'),   //  ﾕ	FF95	ユ	30E6
        ('\u{FF96}', '\u{30E8}'),   //  ﾖ	FF96	ヨ	30E8
        ('\u{FF97}', '\u{30E9}'),   //  ﾗ	FF97	ラ	30E9
        ('\u{FF98}', '\u{30EA}'),   //  ﾘ	FF98	リ	30EA
        ('\u{FF99}', '\u{30EB}'),   //  ﾙ	FF99	ル	30EB
        ('\u{FF9A}', '\u{30EC}'),   //  ﾚ	FF9A	レ	30EC
        ('\u{FF9B}', '\u{30ED}'),   //  ﾛ	FF9B	ロ	30ED
        ('\u{FF9C}', '\u{30EF}'),   //  ﾜ	FF9C	ワ	30EF
        ('\u{FF9D}', '\u{30F3}'),   //  ﾝ	FF9D	ン	30F3
        ('\u{FF9E}', '\u{3099}'),   //  ﾞ	FF9E	 ゙	3099
        ('\u{FF9F}', '\u{309A}'),   //  ﾟ	FF9F	 ゚	309A
        //('\u{FF9E}', '\u{309B}'),   //  ﾞ	FF9E	゛	309B
        //('\u{FF9F}', '\u{309C}'),   //  ﾟ	FF9F	゜	309C
    ].iter().copied().collect();
}

fn shift_code<F,G>(judge: F, convert: G, src: &str) -> String
    where F: Fn(u32) -> bool,
          G: Fn(u32) -> u32
{
    src.chars().map(|c| {
        let k = c as u32;
        if judge(k) { char::from_u32(convert(k)).unwrap() } else { c }
    } ).collect()
}

/// Convert Wide-alphanumeric into normal ASCII  [Ａ -> A]
/// # Examples
/// ```
/// assert_eq!("#&Rust-1.6!", kana::wide2ascii("＃＆Ｒｕｓｔ－１．６！"));
/// ```
pub fn wide2ascii(s: &str) -> String {
    shift_code(|x| 0xff00 < x && x < 0xff5f, |x| x - 0xfee0, s)
}

/// Convert normal ASCII characters into Wide-alphanumeric  [A -> Ａ]
/// # Examples
/// ```
/// assert_eq!("＃＆Ｒｕｓｔ－１．６！", kana::ascii2wide("#&Rust-1.6!"));
/// ```
pub fn ascii2wide(s: &str) -> String {
    shift_code(|x| 0x0020 < x && x < 0x007f, |x| x + 0xfee0, s)
}

/// Convert Hiragana into Katakana  [あ -> ア]
/// # Examples
/// ```
/// assert_eq!("イロハァィゥヴヵヶ", kana::hira2kata("いろはぁぃぅゔゕゖ"));
/// ```
pub fn hira2kata(s: &str) -> String {
    shift_code(|x| 0x3041 <= x && x <= 0x3096, |x| x + 0x0060, s)
}

/// Convert Katakana into Hiragana  [ア -> あ]
/// # Examples
/// ```
/// assert_eq!("いろはぁぃぅゔゕゖ", kana::kata2hira("イロハァィゥヴヵヶ"));
/// ```
pub fn kata2hira(s: &str) -> String {
    shift_code(|x| 0x30A1 <= x && x <= 0x30F6, |x| x - 0x0060, s)
}

macro_rules! push_content {
    ($judge:expr, $table:expr, $res:expr, $a:expr, $b:expr) => {
        if $judge($b) {
            if let Some(v) = $table.get(&$a) {
                $res.push(*v);
                return None;
            }
        }
    };
}

/// Convert Half-width-kana into normal Katakana with diacritical marks separated  [ｱﾞﾊﾟ -> ア゙パ]  
///
/// This method is simple, but tends to cause troubles when rendering.
/// In such a case, use half2kana() or execute vsmark2{half|full|combi}() as a post process.
/// # Examples
/// ```
/// assert_eq!("マツオ バショウ ア゚", kana::half2full("ﾏﾂｵ ﾊﾞｼｮｳ ｱﾟ"));
/// ```
pub fn half2full(s: &str) -> String {
    s.chars().map(|c| consult(&HALVES, &c)).collect()
}

/// Convert Half-width-kana into normal Katakana with diacritical marks combined  [ｱﾞﾊﾟ -> アﾞパ]
/// # Examples
/// ```
/// assert_eq!("マツオ バショウ ア ゚", kana::half2kana("ﾏﾂｵ ﾊﾞｼｮｳ ｱﾟ"));
/// ```
pub fn half2kana(s: &str) -> String {
    let mut line = String::with_capacity(s.len());
    format!("{} ", s).chars().fold(None, |prev, b| {
        if let Some(a) = prev {
            push_content!(|b| b == CH_VOICED_HALF,
                            VOICED_HALVES, line, a, b);
            push_content!(|b| b == CH_SEMIVOICED_HALF,
                            SEMIVOICED_HALVES, line, a, b);
            if a == CH_VOICED_HALF ||
                a == CH_SEMIVOICED_HALF { line.push(CH_SPACE); }
            line.push(consult(&HALVES, &a));
        }
        Some(b)
    } );

    line
}

/// Combine base characters and diacritical marks on Hiragana/Katakana [かﾞハ゜ -> がパ]
/// # Examples
/// ```
/// assert_eq!("ぴびんば", kana::combine("ひ゜ひ゛んは゛"));
/// ```
pub fn combine(s: &str) -> String {
    let ss = despace(s);
    let mut line = String::with_capacity(ss.len());
    format!("{} ", ss).chars().fold(None, |prev, b| {
        if let Some(a) = prev {
            push_content!(|b| b == CH_VOICED_HALF ||
                                b == CH_VOICED_FULL ||
                                b == CH_VOICED_COMBI,
                            VOICES, line, a, b);
            push_content!(|b| b == CH_SEMIVOICED_HALF ||
                                b == CH_SEMIVOICED_FULL ||
                                b == CH_SEMIVOICED_COMBI,
                            SEMIVOICES, line, a, b);
            line.push(a);
        }
        Some(b)
    } );

    enspace(&line)
}

fn consult(table: &HashMap<char,char>, c: &char) -> char {
    match table.get(c) {
        None    => *c,
        Some(x) => *x,
    }
}

fn despace(s: &str) -> String {
    let s_ = &s.replace(VOICED_WITH_SPACE, VOICED_COMBI);
    s_.replace(SEMIVOICED_WITH_SPACE, SEMIVOICED_COMBI)
}

fn enspace(s: &str) -> String {
    let s_ = &s.replace(VOICED_COMBI, VOICED_WITH_SPACE);
    s_.replace(SEMIVOICED_COMBI, SEMIVOICED_WITH_SPACE)
}

fn replace_marks(vmark: &str, svmark: &str, src: &str) -> String {
    lazy_static! {
        static ref RE1: Regex = Regex::new(RE_VOICED_MARKS).unwrap();
        static ref RE2: Regex = Regex::new(RE_SEMIVOICED_MARKS).unwrap();
    }
    let s_ = RE1.replace_all(src, vmark);
    RE2.replace_all(&s_, svmark)
}

/// Convert all separated Voiced-sound-marks into half-width style "\u{FF9E}"
/// # Examples
/// ```
/// assert_eq!("ひﾟひﾞんはﾞ", kana::vsmark2half("ひﾟひ゛んは ゙"));
/// ```
pub fn vsmark2half(s: &str) -> String {
    replace_marks(&CH_VOICED_HALF.to_string(),
                  &CH_SEMIVOICED_HALF.to_string(), s)
}

/// Convert all separated Voiced-sound-marks into full-width style "\u{309B}"
/// # Examples
/// ```
/// assert_eq!("ひ゜ひ゛んは゛", kana::vsmark2full("ひﾟひ゛んは ゙"));
/// ```
pub fn vsmark2full(s: &str) -> String {
    replace_marks(&CH_VOICED_FULL.to_string(),
                  &CH_SEMIVOICED_FULL.to_string(), s)
}

/// Convert all separated Voiced-sound-marks into space+combining style "\u{20}\u{3099}"
/// # Examples
/// ```
/// assert_eq!("ひ ゚ひ ゙んは ゙", kana::vsmark2combi("ひﾟひ゛んは ゙"));
/// ```
pub fn vsmark2combi(s: &str) -> String {
    replace_marks(&VOICED_WITH_SPACE, &SEMIVOICED_WITH_SPACE, s)
}

/// Convert Wide-space into normal space    ["　" -> " "]
pub fn nowidespace(s: &str) -> String { s.replace("\u{3000}", "\u{20}") }

/// Convert normal space into Wide-space    [" " -> "　"]
pub fn space2wide(s: &str) -> String { s.replace("\u{20}", "\u{3000}") }

/// Convert Wide-yen into Half-width-yen    ["￥" -> "¥"]
pub fn nowideyen(s: &str) -> String { s.replace("\u{ffe5}", "\u{a5}") }

/// Convert Half-width-yen into Wide-yen    ["¥" -> "￥"]
pub fn yen2wide(s: &str) -> String { s.replace("\u{a5}", "\u{ffe5}") }


#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn pub_fn_t1() {
        assert_eq!("!rust-0;", wide2ascii("！ｒｕｓｔ－０；"));
        assert_eq!("！ｒｕｓｔ－０；", ascii2wide("!rust-0;"));
        assert_eq!("カナ", hira2kata("かな"));
        assert_eq!("かな", kata2hira("カナ"));
    }

    #[test]
    fn pub_fn_t2() {
        assert_eq!(" ", nowidespace("　"));
        assert_eq!("　", space2wide(" "));
        assert_eq!("¥", nowideyen("￥"));
        assert_eq!("￥", yen2wide("¥"));
    }

    #[test]
    fn kana_t1() {
        assert_eq!(Some(&'\u{30A2}'), HALVES.get(&'\u{FF71}'));
        assert_eq!("ガナ", half2full("ｶﾞﾅ"));
        assert_eq!("ガナ", half2kana("ｶﾞﾅ"));
        assert_eq!("がな", combine("か゛な"));
    }
}