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use regex::Regex;
macro_rules! regex {
($pattern:expr) => {
regex::Regex::new($pattern).unwrap()
};
}
#[test]
fn unclosed_group_error() {
let err = Regex::new(r"(").unwrap_err();
let msg = err.to_string();
assert!(msg.contains("unclosed group"), "error message: {:?}", msg);
}
#[test]
fn regex_string() {
assert_eq!(r"[a-zA-Z0-9]+", regex!(r"[a-zA-Z0-9]+").as_str());
assert_eq!(r"[a-zA-Z0-9]+", &format!("{}", regex!(r"[a-zA-Z0-9]+")));
assert_eq!(
r#"Regex("[a-zA-Z0-9]+")"#,
&format!("{:?}", regex!(r"[a-zA-Z0-9]+"))
);
}
#[test]
fn capture_names() {
let re = regex!(r"(.)(?P<a>.)");
assert_eq!(3, re.captures_len());
assert_eq!((3, Some(3)), re.capture_names().size_hint());
assert_eq!(
vec![None, None, Some("a")],
re.capture_names().collect::<Vec<_>>()
);
}
#[test]
fn capture_index() {
let re = regex!(r"^(?P<name>.+)$");
let cap = re.captures("abc").unwrap();
assert_eq!(&cap[0], "abc");
assert_eq!(&cap[1], "abc");
assert_eq!(&cap["name"], "abc");
}
#[test]
#[should_panic]
fn capture_index_panic_usize() {
let re = regex!(r"^(?P<name>.+)$");
let cap = re.captures("abc").unwrap();
let _ = cap[2];
}
#[test]
#[should_panic]
fn capture_index_panic_name() {
let re = regex!(r"^(?P<name>.+)$");
let cap = re.captures("abc").unwrap();
let _ = cap["bad name"];
}
#[test]
fn capture_index_lifetime() {
// This is a test of whether the types on `caps["..."]` are general
// enough. If not, this will fail to typecheck.
fn inner(s: &str) -> usize {
let re = regex!(r"(?P<number>[0-9]+)");
let caps = re.captures(s).unwrap();
caps["number"].len()
}
assert_eq!(3, inner("123"));
}
#[test]
fn capture_misc() {
let re = regex!(r"(.)(?P<a>a)?(.)(?P<b>.)");
let cap = re.captures("abc").unwrap();
assert_eq!(5, cap.len());
assert_eq!((0, 3), {
let m = cap.get(0).unwrap();
(m.start(), m.end())
});
assert_eq!(None, cap.get(2));
assert_eq!((2, 3), {
let m = cap.get(4).unwrap();
(m.start(), m.end())
});
assert_eq!("abc", cap.get(0).unwrap().as_str());
assert_eq!(None, cap.get(2));
assert_eq!("c", cap.get(4).unwrap().as_str());
assert_eq!(None, cap.name("a"));
assert_eq!("c", cap.name("b").unwrap().as_str());
}
#[test]
fn sub_capture_matches() {
let re = regex!(r"([a-z])(([a-z])|([0-9]))");
let cap = re.captures("a5").unwrap();
let subs: Vec<_> = cap.iter().collect();
assert_eq!(5, subs.len());
assert!(subs[0].is_some());
assert!(subs[1].is_some());
assert!(subs[2].is_some());
assert!(subs[3].is_none());
assert!(subs[4].is_some());
assert_eq!("a5", subs[0].unwrap().as_str());
assert_eq!("a", subs[1].unwrap().as_str());
assert_eq!("5", subs[2].unwrap().as_str());
assert_eq!("5", subs[4].unwrap().as_str());
}
// Test that the DFA can handle pathological cases. (This should result in the
// DFA's cache being flushed too frequently, which should cause it to quit and
// fall back to the NFA algorithm.)
#[test]
fn dfa_handles_pathological_case() {
fn ones_and_zeroes(count: usize) -> String {
let mut s = String::new();
for i in 0..count {
if i % 3 == 0 {
s.push('1');
} else {
s.push('0');
}
}
s
}
let re = regex!(r"[01]*1[01]{20}$");
let text = {
let mut pieces = ones_and_zeroes(100_000);
pieces.push('1');
pieces.push_str(&ones_and_zeroes(20));
pieces
};
assert!(re.is_match(&text));
}