asca 0.10.2

A linguistic sound change applier
Documentation 
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mod syntax;
mod runtime;

use std::fmt;

pub use syntax::*;
pub use runtime::*;

use crate::RuleGroup;

#[derive(Debug, Clone)]
pub enum ASCAError {
    WordSyn(WordSyntaxError),
    RuleSyn(RuleSyntaxError),
    // WordRun(WordRuntimeError),
    RuleRun(RuleRuntimeError),
    AliasSyn(AliasSyntaxError),
    AliasRun(AliasRuntimeError),
}

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

impl ASCAError {
    pub fn get_error_message(&self) -> String {
        match self {
            Self::WordSyn(e) => e.to_string(),
            Self::RuleSyn(e) => e.to_string(),
            Self::RuleRun(e) => e.to_string(),
            Self::AliasSyn(e) => e.to_string(),
            Self::AliasRun(e) => e.to_string(),
        }
    }

    pub fn format_word_error(&self) -> String {
        match self {
            Self::WordSyn(e) => e.format(),
            _ => unreachable!()
        }
    }

    pub fn format_rule_error(&self, s: &[RuleGroup]) -> String {
        match self {
            Self::RuleSyn(e) => e.format(s),
            Self::RuleRun(e) => e.format(s),
            _ => unreachable!(),
        }
    }

    pub fn format_alias_error(&self, into: &[String], from: &[String]) -> String {
        match self {
            Self::AliasSyn(e) => e.format(into, from),
            Self::AliasRun(e) => e.format(into, from),
            _ => unreachable!()
        }
    }
}

const FEAT_VARIANTS: [&str; 184] = [ 
    "root", "rut", "rt", 
    "consonantal", "consonant", "cons" , "cns",          
    "sonorant", "sonor", "son" , "snrt", "sn",
    "syllabic", "syllab", "syll" , "syl",          
    // Manner Node Features
    "manner", "mann", "man", "mnnr" , "mnr" ,
    "continuant", "contin", "cont" , "cnt",
    "approximant", "approx", "appr", "app",
    "lateral", "latrl", "ltrl", "lat",
    "nasal", "nsl", "nas",
    "delayedrelease", "delrel", "d.r.", "del.rel.", "delayed", "dl", "dlrl", "dr", "delay", "del.rel", "drel",
    "strident", "strid", "stri", "stridnt",
    "rhotic", "rhot", "rho", "rhtc", "rh",
    "click", "clik", "clk", "clck",
    // Laryngeal Node Features
    "laryngeal", "laryng", "laryn", "lar",
    "voice", "voi", "vce", "vc",
    "spreadglottis", "spreadglot", "spread", "s.g.", "s.g", "sg",
    "constrictedglottis", "constricted", "constglot", "constr", "c.g.", "c.g", "cg",
    // Place Node Feature
    "place", "plce", "plc",   
    // Labial Place Node Features
    "labial", "lbl", "lab",
    "labiodental", "ldental", "labiodent", "labdent", "lbdntl", "ldent", "ldl",
    "round", "rund", "rnd", "rd",
    // Coronal Place Node Features
    "coronal", "coron", "crnl", "cor",
    "anterior", "anter", "antr", "ant",
    "distributed", "distrib", "dist", "dis" , "dst",
    // Dorsal Place Node Features
    "dorsal", "drsl", "dors", "dor",
    "front", "frnt", "fnt", "fro", "frt", "fr",
    "back", "bck", "bk",
    "high", "hgh", "hi",
    "low", "lw", "lo",
    "tense", "tens", "tns", "ten",
    "reduced", "reduc", "redu", "rdcd", "red",
    // Pharyngeal Place Node Features
    "pharyngeal", "pharyng", "pharyn", "phar", "phr",
    "advancedtongueroot", "a.t.r.", "a.t.r", "a.tr", "at.r", "atr",
    "retractedtongueroot", "r.t.r.", "r.t.r", "r.tr", "rt.r", "rtr",
    // Suprasegmental Features
    "long", "lng",
    "overlong", "overlng", "ovrlng", "olong", "vlong", "olng", "vlng",
    "stress", "str",
    "secondarystress", "sec.stress", "secstress", "sec.str.", "sec.str", "secstr", "sec",
    // Grouped Suprasegmental Features
    "length", "len",
    "anystress", "anystr", "stressany", "strany",
    "allstress", "allstr", "stressall", "strall"  
];

fn get_feat_closest(s: &str) -> &'static str {
    let mut best_lev = usize::MAX;
    let mut best_str= "";

    for var in FEAT_VARIANTS {
        let len = lev(s, var);
        if len < best_lev {
            best_str = var;
            best_lev = len;
        }
    }

    best_str
} 

fn lev(a: &str, b: &str) -> usize {
    let mut dist = 0;

    if a == b { return dist }

    let a_len = a.chars().count();
    let b_len = b.chars().count();

    debug_assert!(a_len > 0);
    debug_assert!(b_len > 0);

    let mut cache: Vec<usize> = (1..).take(a_len).collect();

    for (bi, b_ch) in b.chars().enumerate() {
        dist = bi;
        let mut a_dist = bi;

        for (ai, a_ch) in a.chars().enumerate() {
            let b_dist = a_dist + (a_ch != b_ch) as usize;

            a_dist = cache[ai];

            dist = if a_dist > dist {
                if b_dist > dist {
                    dist + 1
                } else {
                    b_dist
                }
            } else if b_dist > a_dist {
                a_dist + 1
            } else {
                b_dist
            };

            cache[ai] = dist;
        }
    }

    dist
}