pub fn luhn(cc_n: &str) -> bool {
let mut sum = 0;
let cc_number :String = cc_n.chars().filter(|c| !c.is_whitespace()).collect();
let length = cc_number.len();
let parity = length % 2;
for (j, x) in cc_number.chars().enumerate() {
let cc = cc_number.chars().nth(j).unwrap().to_digit(10);
match cc {
None => {}
Some(mut n) => {
if j % 2 == 0 {
n *= 2;
if n > 9 {
n -= 9;
}
}
sum += n;
}
}
}
if sum == 0 {
false
} else {
println!("{} {}", sum % 10, sum);
sum % 10 == 0
}
}
#[test]
fn test_non_digit_cc_number() {
assert!(!luhn("foo"));
}
#[test]
fn test_empty_cc_number() {
assert!(!luhn(""));
assert!(!luhn(" "));
assert!(!luhn(" "));
assert!(!luhn(" "));
}
#[test]
fn test_single_digit_cc_number() {
assert!(!luhn("0"));
}
#[test]
fn test_two_digit_cc_number() {
assert!(luhn(" 0 0 "));
}
#[test]
fn test_valid_cc_number() {
assert!(luhn("4263 9826 4026 9299"));
assert!(luhn("4539 3195 0343 6467"));
assert!(luhn("7992 7398 7121 1114"));
}
#[test]
fn test_invalid_cc_number() {
assert!(!luhn("4223 9826 4026 9299"));
assert!(!luhn("4539 3195 0343 6476"));
assert!(!luhn("8273 1232 7352 0569"));
}
#[allow(dead_code)]
fn main() {}
fn is_prefix_of(haystack :&str, p :&str) -> bool {
haystack.as_bytes().starts_with(p.as_bytes())
}
pub fn prefix_matches(prefix: &str, request_path: &str) -> bool {
for (i, ph) in prefix.split("/").enumerate() {
let p = request_path.split("/").nth(i);
match p {
Some(c) if ph== "*" => {},
Some(c) if c != ph => return false,
None => return false,
_ => {}
}
}
true
}
#[test]
fn test_matches_without_wildcard() {
assert!(prefix_matches("/v1/publishers", "/v1/publishers"));
assert!(prefix_matches("/v1/publishers", "/v1/publishers/abc-123"));
assert!(prefix_matches("/v1/publishers", "/v1/publishers/abc/books"));
assert!(!prefix_matches("/v1/publishers", "/v1/publishersBooks"));
assert!(!prefix_matches("/v1/publishers", "/v1/parent/publishers"));
assert!(!prefix_matches("/v1/publishers", "/v1"));
}
#[test]
fn test_matches_with_wildcard() {
assert!(prefix_matches(
"/v1/publishers/*/books",
"/v1/publishers/foo/books"
));
assert!(prefix_matches(
"/v1/publishers/*/books",
"/v1/publishers/bar/books"
));
assert!(prefix_matches(
"/v1/publishers/*/books",
"/v1/publishers/foo/books/book1"
));
assert!(!prefix_matches("/v1/publishers/*/books", "/v1/publishers"));
assert!(!prefix_matches(
"/v1/publishers/*/books",
"/v1/publishers/foo/booksByAuthor"
));
}
fn main() {}