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//! The raw Eudex API. /// The sound table. /// /// The first bit each describes a certain property of the phone: /// /// | Position | Modifier | Property | Phones | /// |----------|---------:|--------------|:------------------------:| /// | 1 | 1 | Discriminant | (for tagging duplicates) | /// | 2 | 2 | Nasal | mn | /// | 3 | 4 | Fricative | fvsjxzhct | /// | 4 | 8 | Plosive | pbtdcgqk | /// | 5 | 16 | Dental | tdnzs | /// | 6 | 32 | Liquid | lr | /// | 7 | 64 | Labial | bfpv | /// | 8 | 128 | Confident¹ | lrxzq | /// /// ¹hard to misspell. /// /// Vowels are, to maxize the XOR distance, represented by 0 and 1 (open and close, respectively). const PHONES: [u8; LETTERS as usize] = [ 0, // a // +--------- Confident // |+-------- Labial // ||+------- Liquid // |||+------ Dental // ||||+----- Plosive // |||||+---- Fricative // ||||||+--- Nasal // |||||||+-- Discriminant // |||||||| 0b01001000, // b 0b00001100, // c 0b00011000, // d 0, // e 0b01000100, // f 0b00001000, // g 0b00000100, // h 1, // i 0b00000101, // j 0b00001001, // k 0b10100000, // l 0b00000010, // m 0b00010010, // n 0, // o 0b01001001, // p 0b10101000, // q 0b10100001, // r 0b00010100, // s 0b00011101, // t 1, // u 0b01000101, // v 0b00000000, // w 0b10000100, // x 1, // y 0b10010100, // z ]; // Non ASCII-phones. // // Starts 0xDF (ß). These are all aproixmated sounds, since they can vary a lot between languages. const PHONES_C1: [u8; LETTERS_C1 as usize] = [ PHONES[(b's' - b'a') as usize] ^ 1, // ß 0, // à 0, // á 0, // â 0, // ã 0, // ä [æ] 1, // å [oː] 0, // æ [æ] PHONES[(b'z' - b'a') as usize] ^ 1, // ç [t͡ʃ] 1, // è 1, // é 1, // ê 1, // ë 1, // ì 1, // í 1, // î 1, // ï 0b00010101, // ð [ð̠] (represented as a non-plosive T) 0b00010111, // ñ [nj] (represented as a combination of n and j) 0, // ò 0, // ó 0, // ô 0, // õ 1, // ö [ø] !0, // ÷ 1, // ø [ø] 1, // ù 1, // ú 1, // û 1, // ü 1, // ý 0b00010101, // þ [ð̠] (represented as a non-plosive T) 1, // ÿ ]; /// An _injective_ phone table. /// /// The table is derived the following way: /// /// | Position | Modifier | Property (vowel) | Property (consonant) | /// |----------|---------:|---------------------|---------------------------------------------------| /// | 1 | 1 | Discriminant | (property 2 from the phone table) or discriminant | /// | 2 | 2 | Is it open-mid? | (property 3 from the phone table) | /// | 3 | 4 | Is it central? | (property 4 from the phone table) | /// | 4 | 8 | Is it close-mid? | (property 5 from the phone table) | /// | 5 | 16 | Is it front? | (property 6 from the phone table) | /// | 6 | 32 | Is it close? | (property 7 from the phone table) | /// | 7 | 64 | More close than [ɜ] | (property 8 from the phone table) | /// | 8 | 128 | Vowel? | /// /// If it is a consonant, the rest of the bits are simply a right truncated version of the /// [`PHONES`](./const.PHONES.html) table, with the LSD used as discriminant. const INJECTIVE_PHONES: [u8; LETTERS as usize] = [ // +--------- Vowel // |+-------- Closer than ɜ // ||+------- Close // |||+------ Front // ||||+----- Close-mid // |||||+---- Central // ||||||+--- Open-mid // |||||||+-- Discriminant // |||||||| (*=vowel) 0b10000100, // a* 0b00100100, // b 0b00000110, // c 0b00001100, // d 0b11011000, // e* 0b00100010, // f 0b00000100, // g 0b00000010, // h 0b11111000, // i* 0b00000011, // j 0b00000101, // k 0b01010000, // l 0b00000001, // m 0b00001001, // n 0b10010100, // o* 0b00100101, // p 0b01010100, // q 0b01010001, // r 0b00001010, // s 0b00001110, // t 0b11100000, // u* 0b00100011, // v 0b00000000, // w 0b01000010, // x 0b11100100, // y* 0b01001010, // z ]; /// Non-ASCII injective phone table. /// /// Starting at C1. const INJECTIVE_PHONES_C1: [u8; LETTERS_C1 as usize] = [ INJECTIVE_PHONES[(b's' - b'a') as usize] ^ 1, // ß INJECTIVE_PHONES[(b'a' - b'a') as usize] ^ 1, // à INJECTIVE_PHONES[(b'a' - b'a') as usize] ^ 1, // á // +--------- Vowel // |+-------- Closer than ɜ // ||+------- Close // |||+------ Front // ||||+----- Close-mid // |||||+---- Central // ||||||+--- Open-mid // |||||||+-- Discriminant // |||||||| 0b10000000, // â 0b10000110, // ã 0b10100110, // ä [æ] 0b11000010, // å [oː] 0b10100111, // æ [æ] 0b01010100, // ç [t͡ʃ] INJECTIVE_PHONES[(b'e' - b'a') as usize] ^ 1, // è INJECTIVE_PHONES[(b'e' - b'a') as usize] ^ 1, // é INJECTIVE_PHONES[(b'e' - b'a') as usize] ^ 1, // ê 0b11000110, // ë [ə] or [œ] INJECTIVE_PHONES[(b'i' - b'a') as usize] ^ 1, // ì INJECTIVE_PHONES[(b'i' - b'a') as usize] ^ 1, // í INJECTIVE_PHONES[(b'i' - b'a') as usize] ^ 1, // î INJECTIVE_PHONES[(b'i' - b'a') as usize] ^ 1, // ï 0b00001011, // ð [ð̠] (represented as a non-plosive T) 0b00001011, // ñ [nj] (represented as a combination of n and j) INJECTIVE_PHONES[(b'o' - b'a') as usize] ^ 1, // ò INJECTIVE_PHONES[(b'o' - b'a') as usize] ^ 1, // ó INJECTIVE_PHONES[(b'o' - b'a') as usize] ^ 1, // ô INJECTIVE_PHONES[(b'o' - b'a') as usize] ^ 1, // õ 0b11011100, // ö [œ] or [ø] !0, // ÷ 0b11011101,// ø [œ] or [ø] INJECTIVE_PHONES[(b'u' - b'a') as usize] ^ 1, // ù INJECTIVE_PHONES[(b'u' - b'a') as usize] ^ 1, // ú INJECTIVE_PHONES[(b'u' - b'a') as usize] ^ 1, // û INJECTIVE_PHONES[(b'y' - b'a') as usize] ^ 1, // ü INJECTIVE_PHONES[(b'y' - b'a') as usize] ^ 1, // ý 0b00001011, // þ [ð̠] (represented as a non-plosive T) INJECTIVE_PHONES[(b'y' - b'a') as usize] ^ 1, // ÿ ]; /// Number of letters in our phone map. const LETTERS: u8 = 26; /// Number of letters in our C1 phone map. const LETTERS_C1: u8 = 33; /// Map the first character in a word. #[inline(always)] pub fn map_first(mut x: u8) -> u8 { x |= 32; x = x.wrapping_sub(b'a'); if x < LETTERS { INJECTIVE_PHONES[x as usize] } else if x >= 0xDF && x < 0xFF { INJECTIVE_PHONES_C1[(x - 0xDF) as usize] } else { 0 } } /// Filter a non-head character. /// /// `None` means "skip this character", whereas `Some(x)` means "push x". /// /// Eudex works by building up a hash by this filter and then XORing to get the difference. #[inline(always)] pub fn filter(prev: u8, mut x: u8) -> Option<u8> { x |= 32; x = x.wrapping_sub(b'a'); x = if x < LETTERS { PHONES[x as usize] } else if x >= 0xDF && x < 0xFF { PHONES_C1[(x - 0xDF) as usize] } else { return None; }; if x & 1 != prev & 1 { Some(x) } else { None } }