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use std::fmt;
use regex;
use Predicate;
pub type RegexError = regex::Error;
#[derive(Debug, Clone)]
pub struct RegexPredicate {
re: regex::Regex,
}
impl RegexPredicate {
pub fn count(self, count: usize) -> RegexMatchesPredicate {
RegexMatchesPredicate { re: self.re, count }
}
}
impl Predicate<str> for RegexPredicate {
fn eval(&self, variable: &str) -> bool {
self.re.is_match(variable)
}
}
impl fmt::Display for RegexPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.is_match({})", self.re)
}
}
#[derive(Debug, Clone)]
pub struct RegexMatchesPredicate {
re: regex::Regex,
count: usize,
}
impl Predicate<str> for RegexMatchesPredicate {
fn eval(&self, variable: &str) -> bool {
self.re.find_iter(variable).count() == self.count
}
}
impl fmt::Display for RegexMatchesPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.is_match({}).count({})", self.re, self.count)
}
}
pub fn is_match<S>(pattern: S) -> Result<RegexPredicate, RegexError>
where
S: AsRef<str>,
{
regex::Regex::new(pattern.as_ref()).map(|re| RegexPredicate { re })
}