Chars.java

package me.august.lumen.common;

public final class Chars {

    private Chars() {}

    public static boolean isAlpha(char c) {
        return c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z';
    }

    public static boolean isLowerAlpha(char c) {
        return c >= 'a' && c <= 'z';
    }

    public static boolean isUpperAlpha(char c) {
        return c >= 'A' && c <= 'Z';
    }

    public static boolean isDigit(char c) {
        return c >= '0' && c <= '9';
    }

    public static boolean isIdentifierStart(char c) {
        return c == '_' || isAlpha(c);
    }

    public static boolean isIdentifierRest(char c) {
        return c == '_' || isAlpha(c) || isDigit(c);
    }

}