flexsearch-ts/src/lang/latin/balance.js

Next-Generation full text search library with zero dependencies.

import { IndexInterface } from "../../type.js";
import { encode as encode_simple } from "./simple.js";

// custom soundex implementation

export const rtl = false;
export const tokenize = "strict";
export default {
    encode: encode,
    rtl: rtl,
    tokenize: tokenize
}

//const regex_whitespace = /[\W_]+/g;
const regex_strip = /[^a-z0-9]+/;

// const pairs = [
//     regex_whitespace, " ",
//     regex_strip, ""
// ];

// modified

const soundex = {

    "b": "p",
    //"p": "p",

    //"f": "f",
    "v": "f",
    "w": "f",

    //"s": "s",
    "z": "s",
    "x": "s",
    "ß": "s",

    "d": "t",
    //"t": "t",

    //"l": "l",

    //"m": "m",
    "n": "m",

    "c": "k",
    "g": "k",
    "j": "k",
    //"k": "k",
    "q": "k",

    //"r": "r",
    //"h": "h",
    //"a": "a",

    //"e": "e",
    "i": "e",
    "y": "e",

    //"o": "o",
    "u": "o"
};

/**
 * @param {string|number} str
 * @this IndexInterface
 */

export function encode(str){

    str = encode_simple.call(this, str).join(" ");

    // str = this.pipeline(
    //
    //     /* string: */ normalize("" + str).toLowerCase(),
    //     /* normalize: */ false,
    //     /* split: */ false,
    //     /* collapse: */ false
    // );

    const result = [];

    if(str){

        const words = str.split(regex_strip);
        const length = words.length;

        for(let x = 0, tmp, count = 0; x < length; x++){

            if((str = words[x]) /*&& (str.length > 2)*/ && (!this.filter || !this.filter[str])){

                tmp = str[0];
                let code = soundex[tmp] || tmp; //str[0];
                let previous = code; //soundex[code] || code;

                for(let i = 1; i < str.length; i++){

                    tmp = str[i];
                    const current = soundex[tmp] || tmp;

                    if(current && (current !== previous)){

                        code += current;
                        previous = current;

                        // if(code.length === 7){
                        //
                        //     break;
                        // }
                    }
                }

                result[count++] = code; //(code + "0000").substring(0, 4);
            }
        }
    }

    return result;
}