1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
//! ref: composer/vendor/composer/semver/src/CompilingMatcher.php
use crate::constraint::AnyConstraint;
use crate::constraint::SimpleConstraint;
use indexmap::IndexMap;
use shirabe_php_shim::CmpOp;
use std::fmt::Write as _;
use std::sync::Mutex;
use std::sync::OnceLock;
thread_local! {
static KEY_BUFFER: std::cell::RefCell<String> =
const { std::cell::RefCell::new(String::new()) };
}
// Rust does not support eval(), so the compiled checker path is always disabled.
// The COMPILED_CHECKER_CACHE is retained structurally but never populated.
static COMPILED_CHECKER_CACHE: OnceLock<
Mutex<IndexMap<String, Box<dyn Fn(String, bool) -> bool + Send + Sync>>>,
> = OnceLock::new();
static RESULT_CACHE: OnceLock<Mutex<IndexMap<String, bool>>> = OnceLock::new();
pub struct CompilingMatcher;
impl CompilingMatcher {
fn compiled_checker_cache()
-> &'static Mutex<IndexMap<String, Box<dyn Fn(String, bool) -> bool + Send + Sync>>> {
COMPILED_CHECKER_CACHE.get_or_init(|| Mutex::new(IndexMap::new()))
}
fn result_cache() -> &'static Mutex<IndexMap<String, bool>> {
RESULT_CACHE.get_or_init(|| Mutex::new(IndexMap::new()))
}
pub fn clear() {
Self::result_cache().lock().unwrap().clear();
Self::compiled_checker_cache().lock().unwrap().clear();
}
pub fn r#match(constraint: &AnyConstraint, operator: CmpOp, version: &str) -> bool {
#[derive(Debug)]
enum CacheResult {
Hit(bool),
Miss(String),
}
// The key is built into a reused buffer and only copied when it has to be stored, so a
// cache hit allocates nothing.
let cached = KEY_BUFFER.with_borrow_mut(|key| {
key.clear();
let _ = write!(
key,
"{}{};{}",
SimpleConstraint::get_operator_constant(operator),
constraint,
version
);
let cache = Self::result_cache().lock().unwrap();
match cache.get(key.as_str()) {
Some(&result) => CacheResult::Hit(result),
None => CacheResult::Miss(key.clone()),
}
});
let key = match cached {
CacheResult::Hit(result) => return result,
CacheResult::Miss(key) => key,
};
let result = constraint.matches(
&SimpleConstraint::new(operator.to_string(), version.to_string(), None).into(),
);
Self::result_cache().lock().unwrap().insert(key, result);
result
}
}
|
