Antlr3.Tool.Grammar.GetANTLRCharLiteralForChar C# (CSharp) Method

        public static string GetANTLRCharLiteralForChar( int c )
        {
            if ( c < Label.MIN_CHAR_VALUE )
            {
                ErrorManager.InternalError( "invalid char value " + c );
                return "'<INVALID>'";
            }
            if ( c < AntlrLiteralCharValueEscape.Length && AntlrLiteralCharValueEscape[c] != null )
            {
                return '\'' + AntlrLiteralCharValueEscape[c] + '\'';
            }
            if ( c <= 0x7f && !char.IsControl( (char)c ) )
            {
                if ( c == '\\' )
                {
                    return "'\\\\'";
                }
                if ( c == '\'' )
                {
                    return "'\\''";
                }
                return "'" + (char)c + "'";
            }
            // turn on the bit above max "\uFFFF" value so that we pad with zeros
            // then only take last 4 digits
            string hex = c.ToString( "X4" ); //Integer.toHexString( c | 0x10000 ).toUpperCase().substring( 1, 5 );
            string unicodeStr = "'\\u" + hex + "'";
            return unicodeStr;
        }