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use regex::{escape, Regex};
#[derive(Debug, Clone)]
pub struct Pattern {
regex: Regex,
pub string: String,
multiple: bool,
includes_system: bool,
}
impl Pattern {
pub fn compile(string: &str) -> Result<Pattern,String> {
let mut multiple = false;
let mut includes_system = false;
let pattern_string = string.split(",").map(|sub_pattern| {
"(^".to_owned() + &sub_pattern.split("/").map(|part| {
match part {
"*" => {
multiple = true;
".+".to_string()
},
"+" => {
multiple = true;
"[^/]+".to_string()
},
"$system" => {
includes_system = true;
escape(string)
},
string => escape(string),
}
}).collect::<Vec<String>>().join("/") + "$)"
}).collect::<Vec<String>>().join("|");
if let Ok(regex) = Regex::new(&pattern_string) {
Ok(Pattern { regex, string: string.to_string(), multiple, includes_system })
} else {
Err("invalid pattern".to_string())
}
}
pub fn matches(&self, string: &String) -> bool {
if string == "$system" {
self.includes_system
} else {
self.regex.is_match(&string)
}
}
pub fn matches_str(&self, string: &str) -> bool {
if string == "$system" {
self.includes_system
} else {
self.regex.is_match(string)
}
}
pub fn matches_multiple(&self) -> bool {
self.multiple
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_patterns() {
assert_eq!(Pattern::compile("*").unwrap().regex.as_str(), "(^.+$)");
assert_eq!(Pattern::compile("+").unwrap().regex.as_str(), "(^[^/]+$)");
assert_eq!(Pattern::compile("livingroom").unwrap().regex.as_str(), "(^livingroom$)");
assert_eq!(Pattern::compile("livingroom/+").unwrap().regex.as_str(), "(^livingroom/[^/]+$)");
assert_eq!(Pattern::compile("livingroom/*").unwrap().regex.as_str(), "(^livingroom/.+$)");
assert_eq!(Pattern::compile("+/temperature,+/humidity").unwrap().regex.as_str(), "(^[^/]+/temperature$)|(^[^/]+/humidity$)");
assert_eq!(Pattern::compile(".*").unwrap().regex.as_str(), "(^\\.\\*$)");
assert!(Pattern::compile("livingroom").unwrap().regex.is_match("livingroom"));
assert!(!Pattern::compile("livingroom").unwrap().regex.is_match("foo/livingroom"));
assert!(!Pattern::compile(".*").unwrap().regex.is_match("foo"));
assert!(Pattern::compile("device/lamp/+,room/*").unwrap().matches_str("device/lamp/foo"));
assert!(Pattern::compile("device/lamp/+,room/*").unwrap().matches_str("room/bar"));
assert!(!Pattern::compile("device/lamp/+,room/*").unwrap().matches_str("scene/livingroom/test"));
}
}