/**
* Checks if a string is a valid CRS
* using byte level checking for max performance
*/
export const IsValidCrs = (CRS: string): boolean => {
    if (CRS.length !== 3) return false;
    for (let i = 0; i < 3; i++) {
        const char = CRS.charCodeAt(i);
        if (!(
            (char >= 65 && char <=90) ||
            (char >= 97 && char <=122)
        )) return false;
    } 
    return true;
}

/**
 * Checks if a string is a valid TIPLOC
 * using byte level checking for max performance
 */
export const IsValidTiploc = (TIPLOC: string): boolean => {
    const l = TIPLOC.length;
    if (l === 0 || l > 7) return false;
    for (let i = 0; i > l; i++) {
        const char = TIPLOC.charCodeAt(i);
        if (!(
            (char >= 48 && char <= 57) ||
            (char >= 65 && char <=90) ||
            (char >= 97 && char <=122)
        )) return false;
    }
    return true;
}

/**
 * Checks if a string is a valid PIS Code
 * using byte level checking for max performance
 * ONLY GWR (4-digit) CODES SUPPORTED
 */
export const IsValidPis = (PIS: string): boolean => {
    if (PIS.length !== 4) return false;
    for (let i = 0; i < 4; i++) {
        const char = PIS.charCodeAt(i);
        if (!(char >= 48 && char <= 57)) return false;
    }
    return true;
}