swc_config/
regex_js.rs

1//! Regex cache
2
3use std::{ops::Deref, sync::Arc};
4
5pub use anyhow::Error;
6use anyhow::{Context, Result};
7use dashmap::DashMap;
8use once_cell::sync::Lazy;
9use regress::Regex;
10use rustc_hash::FxBuildHasher;
11use serde::{Deserialize, Serialize};
12
13#[derive(Debug, Clone)]
14pub struct CachedJsRegex {
15    regex: Arc<Regex>,
16    source: String,
17}
18
19impl Deref for CachedJsRegex {
20    type Target = Regex;
21
22    fn deref(&self) -> &Self::Target {
23        &self.regex
24    }
25}
26
27impl CachedJsRegex {
28    /// Get or create a cached regex. This will return the previous instance if
29    /// it's already cached.
30    pub fn new(source: String) -> Result<Self> {
31        static CACHE: Lazy<DashMap<String, Arc<Regex>, FxBuildHasher>> =
32            Lazy::new(Default::default);
33
34        if let Some(cache) = CACHE.get(&source).as_deref().cloned() {
35            return Ok(Self {
36                regex: cache,
37                source,
38            });
39        }
40
41        let regex =
42            Regex::new(&source).with_context(|| format!("failed to parse `{source}` as regex"))?;
43        let regex = Arc::new(regex);
44
45        CACHE.insert(source.to_owned(), regex.clone());
46
47        Ok(CachedJsRegex { regex, source })
48    }
49
50    pub fn source(&self) -> &str {
51        &self.source
52    }
53}
54
55impl<'de> Deserialize<'de> for CachedJsRegex {
56    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
57    where
58        D: serde::Deserializer<'de>,
59    {
60        use serde::de::Error;
61
62        let s = String::deserialize(deserializer)?;
63
64        Self::new(s).map_err(|err| D::Error::custom(err.to_string()))
65    }
66}
67
68impl Serialize for CachedJsRegex {
69    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
70    where
71        S: serde::Serializer,
72    {
73        let s = self.source();
74        serializer.serialize_str(s)
75    }
76}
swc_config/regex_js.rs

swc_config/
regex_js.rs
