of_the_double_string static method

Tokens of_the_double_string(String token_string, { required int decimal_places, })

Implementation

static Tokens of_the_double_string(String token_string, {required int decimal_places}) {
    token_string = token_string.trim();
    if (token_string == '') {
        throw Exception('must be a number');
    }
    List<String> token_string_split = token_string.split('.');
    if (token_string_split.length > 2) {
        throw Exception('invalid number.');
    }
    BigInt whole_tokens = BigInt.parse(token_string_split[0]);
    BigInt tokens_less_than_1 = BigInt.from(0);
    if (token_string_split.length == 2) {
        String token_string_decimal_places = token_string_split[1];
        if (token_string_decimal_places.length > decimal_places) {
            throw Exception('Max ${decimal_places} decimal places');
        }
        while (token_string_decimal_places.length < decimal_places) {
            token_string_decimal_places = '${token_string_decimal_places}0';
        }
        tokens_less_than_1 = BigInt.parse(token_string_decimal_places);
    }
    Tokens tokens = Tokens(quantums: (whole_tokens * BigInt.from(pow(10, decimal_places))) + tokens_less_than_1, decimal_places: decimal_places);
    return tokens;
}