/*!

This library implements
[Unicode Bidi Mirroring](https://unicode.org/reports/tr44/#BidiMirroring.txt) property detection.

```rust
use unicode_bidi_mirroring::*;

assert_eq!(get_mirrored('A'), None);
assert_eq!(get_mirrored('\u{2039}'), Some('\u{203A}'));
assert_eq!(get_mirrored('\u{203A}'), Some('\u{2039}'));

assert_eq!(is_mirroring('A'), false);
assert_eq!(is_mirroring('\u{29C4}'), true);
assert_eq!(is_mirroring('\u{22FF}'), true);
```

*/

#![no_std]
#![forbid(unsafe_code)]

/// The Unicode version.
pub const UNICODE_VERSION: (u8, u8, u8) = (14, 0, 0);

const PAIRS: &[(char, char)] = &[
    ('\u{0028}', '\u{0029}'),
    ('\u{003C}', '\u{003E}'),
    ('\u{005B}', '\u{005D}'),
    ('\u{007B}', '\u{007D}'),
    ('\u{00AB}', '\u{00BB}'),
    ('\u{0F3A}', '\u{0F3B}'),
    ('\u{0F3C}', '\u{0F3D}'),
    ('\u{169B}', '\u{169C}'),
    ('\u{2039}', '\u{203A}'),
    ('\u{2045}', '\u{2046}'),
    ('\u{207D}', '\u{207E}'),
    ('\u{208D}', '\u{208E}'),
    ('\u{2208}', '\u{220B}'),
    ('\u{2209}', '\u{220C}'),
    ('\u{220A}', '\u{220D}'),
    ('\u{2215}', '\u{29F5}'),
    ('\u{221F}', '\u{2BFE}'),
    ('\u{2220}', '\u{29A3}'),
    ('\u{2221}', '\u{299B}'),
    ('\u{2222}', '\u{29A0}'),
    ('\u{2224}', '\u{2AEE}'),
    ('\u{223C}', '\u{223D}'),
    ('\u{2243}', '\u{22CD}'),
    ('\u{2245}', '\u{224C}'),
    ('\u{2252}', '\u{2253}'),
    ('\u{2254}', '\u{2255}'),
    ('\u{2264}', '\u{2265}'),
    ('\u{2266}', '\u{2267}'),
    ('\u{2268}', '\u{2269}'),
    ('\u{226A}', '\u{226B}'),
    ('\u{226E}', '\u{226F}'),
    ('\u{2270}', '\u{2271}'),
    ('\u{2272}', '\u{2273}'),
    ('\u{2274}', '\u{2275}'),
    ('\u{2276}', '\u{2277}'),
    ('\u{2278}', '\u{2279}'),
    ('\u{227A}', '\u{227B}'),
    ('\u{227C}', '\u{227D}'),
    ('\u{227E}', '\u{227F}'),
    ('\u{2280}', '\u{2281}'),
    ('\u{2282}', '\u{2283}'),
    ('\u{2284}', '\u{2285}'),
    ('\u{2286}', '\u{2287}'),
    ('\u{2288}', '\u{2289}'),
    ('\u{228A}', '\u{228B}'),
    ('\u{228F}', '\u{2290}'),
    ('\u{2291}', '\u{2292}'),
    ('\u{2298}', '\u{29B8}'),
    ('\u{22A2}', '\u{22A3}'),
    ('\u{22A6}', '\u{2ADE}'),
    ('\u{22A8}', '\u{2AE4}'),
    ('\u{22A9}', '\u{2AE3}'),
    ('\u{22AB}', '\u{2AE5}'),
    ('\u{22B0}', '\u{22B1}'),
    ('\u{22B2}', '\u{22B3}'),
    ('\u{22B4}', '\u{22B5}'),
    ('\u{22B6}', '\u{22B7}'),
    ('\u{22B8}', '\u{27DC}'),
    ('\u{22C9}', '\u{22CA}'),
    ('\u{22CB}', '\u{22CC}'),
    ('\u{22D0}', '\u{22D1}'),
    ('\u{22D6}', '\u{22D7}'),
    ('\u{22D8}', '\u{22D9}'),
    ('\u{22DA}', '\u{22DB}'),
    ('\u{22DC}', '\u{22DD}'),
    ('\u{22DE}', '\u{22DF}'),
    ('\u{22E0}', '\u{22E1}'),
    ('\u{22E2}', '\u{22E3}'),
    ('\u{22E4}', '\u{22E5}'),
    ('\u{22E6}', '\u{22E7}'),
    ('\u{22E8}', '\u{22E9}'),
    ('\u{22EA}', '\u{22EB}'),
    ('\u{22EC}', '\u{22ED}'),
    ('\u{22F0}', '\u{22F1}'),
    ('\u{22F2}', '\u{22FA}'),
    ('\u{22F3}', '\u{22FB}'),
    ('\u{22F4}', '\u{22FC}'),
    ('\u{22F6}', '\u{22FD}'),
    ('\u{22F7}', '\u{22FE}'),
    ('\u{2308}', '\u{2309}'),
    ('\u{230A}', '\u{230B}'),
    ('\u{2329}', '\u{232A}'),
    ('\u{2768}', '\u{2769}'),
    ('\u{276A}', '\u{276B}'),
    ('\u{276C}', '\u{276D}'),
    ('\u{276E}', '\u{276F}'),
    ('\u{2770}', '\u{2771}'),
    ('\u{2772}', '\u{2773}'),
    ('\u{2774}', '\u{2775}'),
    ('\u{27C3}', '\u{27C4}'),
    ('\u{27C5}', '\u{27C6}'),
    ('\u{27C8}', '\u{27C9}'),
    ('\u{27CB}', '\u{27CD}'),
    ('\u{27D5}', '\u{27D6}'),
    ('\u{27DD}', '\u{27DE}'),
    ('\u{27E2}', '\u{27E3}'),
    ('\u{27E4}', '\u{27E5}'),
    ('\u{27E6}', '\u{27E7}'),
    ('\u{27E8}', '\u{27E9}'),
    ('\u{27EA}', '\u{27EB}'),
    ('\u{27EC}', '\u{27ED}'),
    ('\u{27EE}', '\u{27EF}'),
    ('\u{2983}', '\u{2984}'),
    ('\u{2985}', '\u{2986}'),
    ('\u{2987}', '\u{2988}'),
    ('\u{2989}', '\u{298A}'),
    ('\u{298B}', '\u{298C}'),
    ('\u{298D}', '\u{2990}'),
    ('\u{298E}', '\u{298F}'),
    ('\u{2991}', '\u{2992}'),
    ('\u{2993}', '\u{2994}'),
    ('\u{2995}', '\u{2996}'),
    ('\u{2997}', '\u{2998}'),
    ('\u{29A4}', '\u{29A5}'),
    ('\u{29A8}', '\u{29A9}'),
    ('\u{29AA}', '\u{29AB}'),
    ('\u{29AC}', '\u{29AD}'),
    ('\u{29AE}', '\u{29AF}'),
    ('\u{29C0}', '\u{29C1}'),
    ('\u{29C4}', '\u{29C5}'),
    ('\u{29CF}', '\u{29D0}'),
    ('\u{29D1}', '\u{29D2}'),
    ('\u{29D4}', '\u{29D5}'),
    ('\u{29D8}', '\u{29D9}'),
    ('\u{29DA}', '\u{29DB}'),
    ('\u{29E8}', '\u{29E9}'),
    ('\u{29F8}', '\u{29F9}'),
    ('\u{29FC}', '\u{29FD}'),
    ('\u{2A2B}', '\u{2A2C}'),
    ('\u{2A2D}', '\u{2A2E}'),
    ('\u{2A34}', '\u{2A35}'),
    ('\u{2A3C}', '\u{2A3D}'),
    ('\u{2A64}', '\u{2A65}'),
    ('\u{2A79}', '\u{2A7A}'),
    ('\u{2A7B}', '\u{2A7C}'),
    ('\u{2A7D}', '\u{2A7E}'),
    ('\u{2A7F}', '\u{2A80}'),
    ('\u{2A81}', '\u{2A82}'),
    ('\u{2A83}', '\u{2A84}'),
    ('\u{2A85}', '\u{2A86}'),
    ('\u{2A87}', '\u{2A88}'),
    ('\u{2A89}', '\u{2A8A}'),
    ('\u{2A8B}', '\u{2A8C}'),
    ('\u{2A8D}', '\u{2A8E}'),
    ('\u{2A8F}', '\u{2A90}'),
    ('\u{2A91}', '\u{2A92}'),
    ('\u{2A93}', '\u{2A94}'),
    ('\u{2A95}', '\u{2A96}'),
    ('\u{2A97}', '\u{2A98}'),
    ('\u{2A99}', '\u{2A9A}'),
    ('\u{2A9B}', '\u{2A9C}'),
    ('\u{2A9D}', '\u{2A9E}'),
    ('\u{2A9F}', '\u{2AA0}'),
    ('\u{2AA1}', '\u{2AA2}'),
    ('\u{2AA6}', '\u{2AA7}'),
    ('\u{2AA8}', '\u{2AA9}'),
    ('\u{2AAA}', '\u{2AAB}'),
    ('\u{2AAC}', '\u{2AAD}'),
    ('\u{2AAF}', '\u{2AB0}'),
    ('\u{2AB1}', '\u{2AB2}'),
    ('\u{2AB3}', '\u{2AB4}'),
    ('\u{2AB5}', '\u{2AB6}'),
    ('\u{2AB7}', '\u{2AB8}'),
    ('\u{2AB9}', '\u{2ABA}'),
    ('\u{2ABB}', '\u{2ABC}'),
    ('\u{2ABD}', '\u{2ABE}'),
    ('\u{2ABF}', '\u{2AC0}'),
    ('\u{2AC1}', '\u{2AC2}'),
    ('\u{2AC3}', '\u{2AC4}'),
    ('\u{2AC5}', '\u{2AC6}'),
    ('\u{2AC7}', '\u{2AC8}'),
    ('\u{2AC9}', '\u{2ACA}'),
    ('\u{2ACB}', '\u{2ACC}'),
    ('\u{2ACD}', '\u{2ACE}'),
    ('\u{2ACF}', '\u{2AD0}'),
    ('\u{2AD1}', '\u{2AD2}'),
    ('\u{2AD3}', '\u{2AD4}'),
    ('\u{2AD5}', '\u{2AD6}'),
    ('\u{2AEC}', '\u{2AED}'),
    ('\u{2AF7}', '\u{2AF8}'),
    ('\u{2AF9}', '\u{2AFA}'),
    ('\u{2E02}', '\u{2E03}'),
    ('\u{2E04}', '\u{2E05}'),
    ('\u{2E09}', '\u{2E0A}'),
    ('\u{2E0C}', '\u{2E0D}'),
    ('\u{2E1C}', '\u{2E1D}'),
    ('\u{2E20}', '\u{2E21}'),
    ('\u{2E22}', '\u{2E23}'),
    ('\u{2E24}', '\u{2E25}'),
    ('\u{2E26}', '\u{2E27}'),
    ('\u{2E28}', '\u{2E29}'),
    ('\u{2E55}', '\u{2E56}'),
    ('\u{2E57}', '\u{2E58}'),
    ('\u{2E59}', '\u{2E5A}'),
    ('\u{2E5B}', '\u{2E5C}'),
    ('\u{3008}', '\u{3009}'),
    ('\u{300A}', '\u{300B}'),
    ('\u{300C}', '\u{300D}'),
    ('\u{300E}', '\u{300F}'),
    ('\u{3010}', '\u{3011}'),
    ('\u{3014}', '\u{3015}'),
    ('\u{3016}', '\u{3017}'),
    ('\u{3018}', '\u{3019}'),
    ('\u{301A}', '\u{301B}'),
    ('\u{FE59}', '\u{FE5A}'),
    ('\u{FE5B}', '\u{FE5C}'),
    ('\u{FE5D}', '\u{FE5E}'),
    ('\u{FE64}', '\u{FE65}'),
    ('\u{FF08}', '\u{FF09}'),
    ('\u{FF1C}', '\u{FF1E}'),
    ('\u{FF3B}', '\u{FF3D}'),
    ('\u{FF5B}', '\u{FF5D}'),
    ('\u{FF5F}', '\u{FF60}'),
    ('\u{FF62}', '\u{FF63}'),
];

const OTHER: &[char] = &[
    '\u{2140}',
    '\u{2201}',
    '\u{2202}',
    '\u{2203}',
    '\u{2204}',
    '\u{2211}',
    '\u{2216}',
    '\u{221A}',
    '\u{221B}',
    '\u{221C}',
    '\u{221D}',
    '\u{2226}',
    '\u{222B}',
    '\u{222C}',
    '\u{222D}',
    '\u{222E}',
    '\u{222F}',
    '\u{2230}',
    '\u{2231}',
    '\u{2232}',
    '\u{2233}',
    '\u{2239}',
    '\u{223B}',
    '\u{223E}',
    '\u{223F}',
    '\u{2240}',
    '\u{2241}',
    '\u{2242}',
    '\u{2244}',
    '\u{2246}',
    '\u{2247}',
    '\u{2248}',
    '\u{2249}',
    '\u{224A}',
    '\u{224B}',
    '\u{225F}',
    '\u{2260}',
    '\u{2262}',
    '\u{228C}',
    '\u{22A7}',
    '\u{22AA}',
    '\u{22AC}',
    '\u{22AD}',
    '\u{22AE}',
    '\u{22AF}',
    '\u{22BE}',
    '\u{22BF}',
    '\u{22F5}',
    '\u{22F8}',
    '\u{22F9}',
    '\u{22FF}',
    '\u{2320}',
    '\u{2321}',
    '\u{27C0}',
    '\u{27CC}',
    '\u{27D3}',
    '\u{27D4}',
    '\u{299C}',
    '\u{299D}',
    '\u{299E}',
    '\u{299F}',
    '\u{29A2}',
    '\u{29A6}',
    '\u{29A7}',
    '\u{29C2}',
    '\u{29C3}',
    '\u{29C9}',
    '\u{29CE}',
    '\u{29DC}',
    '\u{29E1}',
    '\u{29E3}',
    '\u{29E4}',
    '\u{29E5}',
    '\u{29F4}',
    '\u{29F6}',
    '\u{29F7}',
    '\u{2A0A}',
    '\u{2A0B}',
    '\u{2A0C}',
    '\u{2A0D}',
    '\u{2A0E}',
    '\u{2A0F}',
    '\u{2A10}',
    '\u{2A11}',
    '\u{2A12}',
    '\u{2A13}',
    '\u{2A14}',
    '\u{2A15}',
    '\u{2A16}',
    '\u{2A17}',
    '\u{2A18}',
    '\u{2A19}',
    '\u{2A1A}',
    '\u{2A1B}',
    '\u{2A1C}',
    '\u{2A1E}',
    '\u{2A1F}',
    '\u{2A20}',
    '\u{2A21}',
    '\u{2A24}',
    '\u{2A26}',
    '\u{2A29}',
    '\u{2A3E}',
    '\u{2A57}',
    '\u{2A58}',
    '\u{2A6A}',
    '\u{2A6B}',
    '\u{2A6C}',
    '\u{2A6D}',
    '\u{2A6F}',
    '\u{2A70}',
    '\u{2A73}',
    '\u{2A74}',
    '\u{2AA3}',
    '\u{2ADC}',
    '\u{2AE2}',
    '\u{2AE6}',
    '\u{2AF3}',
    '\u{2AFB}',
    '\u{2AFD}',
    '\u{1D6DB}',
    '\u{1D715}',
    '\u{1D74F}',
    '\u{1D789}',
    '\u{1D7C3}',
];

/// Returns a bidi mirrored character.
///
/// Based on <https://www.unicode.org/Public/UNIDATA/BidiMirroring.txt>.
pub fn get_mirrored(c: char) -> Option<char> {
    if let Ok(idx) = PAIRS.binary_search_by(|v| v.0.cmp(&c)) {
        return Some(PAIRS[idx].1);
    }

    if let Ok(idx) = PAIRS.binary_search_by(|v| v.1.cmp(&c)) {
        return Some(PAIRS[idx].0);
    }

    None
}

/// Checks that character is bidi mirrored.
///
/// Based on <https://www.unicode.org/Public/UNIDATA/BidiMirroring.txt>.
pub fn is_mirroring(c: char) -> bool {
    PAIRS.binary_search_by(|v| v.0.cmp(&c)).is_ok() ||
    PAIRS.binary_search_by(|v| v.1.cmp(&c)).is_ok() ||
    OTHER.binary_search_by(|v| v.cmp(&c)).is_ok()
}