Antlr4.Misc.CharSupport.GetCharValueFromGrammarCharLiteral C# (CSharp) Method

        public static int GetCharValueFromGrammarCharLiteral(string literal)
        {
            if (literal == null || literal.Length < 3)
                return -1;

            return GetCharValueFromCharInGrammarLiteral(literal.Substring(1, literal.Length - 2));
        }