lib.rs - mozsearch

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use regex::Captures;

use regex::Regex;

use std::borrow::Cow;

static TRANSFORM_SMALL_MAP: &[char] = &[

    'a', 'ƀ', 'ƈ', 'ḓ', 'e', 'ƒ', 'ɠ', 'ħ', 'i', 'ĵ', 'ķ', 'ŀ', 'ḿ', 'ƞ', 'o', 'ƥ', 'ɋ', 'ř', 'ş',

    'ŧ', 'u', 'ṽ', 'ẇ', 'ẋ', 'ẏ', 'ẑ',

];

static TRANSFORM_CAPS_MAP: &[char] = &[

    'A', 'Ɓ', 'Ƈ', 'Ḓ', 'E', 'Ƒ', 'Ɠ', 'Ħ', 'I', 'Ĵ', 'Ķ', 'Ŀ', 'Ḿ', 'Ƞ', 'O', 'Ƥ', 'Ɋ', 'Ř', 'Ş',

    'Ŧ', 'U', 'Ṽ', 'Ẇ', 'Ẋ', 'Ẏ', 'Ẑ',

];

static FLIPPED_SMALL_MAP: &[char] = &[

    'ɐ', 'q', 'ɔ', 'p', 'ǝ', 'ɟ', 'ƃ', 'ɥ', 'ı', 'ɾ', 'ʞ', 'ʅ', 'ɯ', 'u', 'o', 'd', 'b', 'ɹ', 's',

    'ʇ', 'n', 'ʌ', 'ʍ', 'x', 'ʎ', 'z',

];

static FLIPPED_CAPS_MAP: &[char] = &[

    '∀', 'Ԑ', 'Ↄ', 'ᗡ', 'Ǝ', 'Ⅎ', '⅁', 'H', 'I', 'ſ', 'Ӽ', '⅂', 'W', 'N', 'O', 'Ԁ', 'Ò', 'ᴚ', 'S',

    '⊥', '∩', 'Ʌ', 'M', 'X', '⅄', 'Z',

];

static mut RE_EXCLUDED: Option<Regex> = None;

static mut RE_AZ: Option<Regex> = None;

pub fn transform_dom(s: &str, flipped: bool, elongate: bool, with_markers: bool) -> Cow<str> {

    // Exclude access-keys and other single-char messages

    if s.len() == 1 {

        return s.into();

    // XML entities (&#x202a;) and XML tags.

    let re_excluded =

        unsafe { RE_EXCLUDED.get_or_insert_with(|| Regex::new(r"&[#\w]+;|<\s*.+?\s*>").unwrap()) };

    let mut result = Cow::from(s);

    let mut pos = 0;

    let mut diff = 0;

    for cap in re_excluded.captures_iter(s) {

        let capture = cap.get(0).unwrap();

        let sub_len = capture.start() - pos;

        let range = pos..capture.start();

        let result_range = pos + diff..capture.start() + diff;

        let sub = &s[range.clone()];

        let transform_sub = transform(&sub, false, true);

        diff += transform_sub.len() - sub_len;

        result

            .to_mut()

            .replace_range(result_range.clone(), &transform_sub);

        pos = capture.end();

    let range = pos..s.len();

    let result_range = pos + diff..result.len();

    let transform_sub = transform(&s[range], flipped, elongate);

    result.to_mut().replace_range(result_range, &transform_sub);

    if with_markers {

        return Cow::from("[") + result + "]"

    result

pub fn transform(s: &str, flipped: bool, elongate: bool) -> Cow<str> {

    let re_az = unsafe { RE_AZ.get_or_insert_with(|| Regex::new(r"[a-zA-Z]").unwrap()) };

    let (small_map, caps_map) = if flipped {

        (FLIPPED_SMALL_MAP, FLIPPED_CAPS_MAP)

    } else {

        (TRANSFORM_SMALL_MAP, TRANSFORM_CAPS_MAP)

};

    re_az.replace_all(s, |caps: &Captures| {

        let ch = caps[0].chars().next().unwrap();

        let cc = ch as u8;

        if (97..=122).contains(&cc) {

            let pos = cc - 97;

            let new_char = small_map[pos as usize];

            // duplicate "a", "e", "o" and "u" to emulate ~30% longer text

            if elongate && (cc == 97 || cc == 101 || cc == 111 || cc == 117) {

                let mut s = new_char.to_string();

                s.push(new_char);

            } else {

                new_char.to_string()

        } else if (65..=90).contains(&cc) {

            let pos = cc - 65;

            let new_char = caps_map[pos as usize];

            new_char.to_string()

        } else {

            ch.to_string()

})

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    fn it_works() {

        let x = transform("Hello World", false, true);

        assert_eq!(x, "Ħeeŀŀoo Ẇoořŀḓ");

        let x = transform("Hello World", false, false);

        assert_eq!(x, "Ħeŀŀo Ẇořŀḓ");

        let x = transform("Hello World", true, false);

        assert_eq!(x, "Hǝʅʅo Moɹʅp");

        let x = transform("f", false, true);

        assert_eq!(x, "ƒ");

    #[test]

    fn dom_test() {

        let x = transform_dom("Hello <a>World</a>", false, true, false);

        assert_eq!(x, "Ħeeŀŀoo <a>Ẇoořŀḓ</a>");

        let x = transform_dom("Hello <a>World</a> in <b>my</b> House.", false, true, false);

        assert_eq!(x, "Ħeeŀŀoo <a>Ẇoořŀḓ</a> iƞ <b>ḿẏ</b> Ħoouuşee.");

        // Use markers.

        let x = transform_dom("Hello World within markers", false, false, true);

        assert_eq!(x, "[Ħeŀŀo Ẇořŀḓ ẇiŧħiƞ ḿařķeřş]");

        // Don't touch single character values.

        let x = transform_dom("f", false, true, false);

        assert_eq!(x, "f");