diff options
Diffstat (limited to 'crates/shirabe-php-shim/src/preg.rs')
| -rw-r--r-- | crates/shirabe-php-shim/src/preg.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/crates/shirabe-php-shim/src/preg.rs b/crates/shirabe-php-shim/src/preg.rs index 4b43467..3da8ae7 100644 --- a/crates/shirabe-php-shim/src/preg.rs +++ b/crates/shirabe-php-shim/src/preg.rs @@ -1,3 +1,6 @@ +use indexmap::IndexMap; +use std::sync::{LazyLock, Mutex}; + pub const PREG_PATTERN_ORDER: i64 = 1; pub const PREG_SET_ORDER: i64 = 2; pub const PREG_OFFSET_CAPTURE: i64 = 256; @@ -439,7 +442,28 @@ fn translate_pcre_literals(inner: &str) -> String { out } +// PHP's PCRE engine keeps a per-process cache of compiled patterns (pcre.cache_size, default 4096), +// so repeated preg_* calls with the same pattern string are effectively free. The `regex` crate has +// no such cache, and callers like the classmap generator re-issue the same pattern string for every +// file (or even every scanned token), so compilation must be memoized here to match PHP's amortized +// cost. +static PATTERN_CACHE: LazyLock<Mutex<IndexMap<String, (regex::Regex, bool)>>> = + LazyLock::new(|| Mutex::new(IndexMap::new())); + fn compile_php_pattern(pattern: &str) -> anyhow::Result<(regex::Regex, bool)> { + if let Some(cached) = PATTERN_CACHE.lock().unwrap().get(pattern) { + return Ok(cached.clone()); + } + + let compiled = compile_php_pattern_uncached(pattern)?; + PATTERN_CACHE + .lock() + .unwrap() + .insert(pattern.to_string(), compiled.clone()); + Ok(compiled) +} + +fn compile_php_pattern_uncached(pattern: &str) -> anyhow::Result<(regex::Regex, bool)> { let delimiter = pattern .chars() .next() |