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//! A type that represents the union of a set of regular expressions.
use regex::RegexSet as RxSet;
/// A dynamic set of regular expressions.
#[derive(Debug)]
pub struct RegexSet {
items: Vec<String>,
set: Option<RxSet>,
}
impl RegexSet {
/// Is this set empty?
pub fn is_empty(&self) -> bool {
self.items.is_empty()
}
/// Insert a new regex into this set.
pub fn insert<S>(&mut self, string: S)
where
S: AsRef<str>,
{
self.items.push(format!("^{}$", string.as_ref()));
self.set = None;
}
/// Returns slice of String from its field 'items'
pub fn get_items(&self) -> &[String] {
&self.items[..]
}
/// Construct a RegexSet from the set of entries we've accumulated.
///
/// Must be called before calling `matches()`, or it will always return
/// false.
pub fn build(&mut self) {
self.set = match RxSet::new(&self.items) {
Ok(x) => Some(x),
Err(e) => {
error!("Invalid regex in {:?}: {:?}", self.items, e);
None
}
}
}
/// Does the given `string` match any of the regexes in this set?
pub fn matches<S>(&self, string: S) -> bool
where
S: AsRef<str>,
{
let s = string.as_ref();
self.set.as_ref().map(|set| set.is_match(s)).unwrap_or(
false,
)
}
}
impl Default for RegexSet {
fn default() -> Self {
RegexSet {
items: vec![],
set: None,
}
}
}
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