forked from mirror/codeberg-forgejo
45 lines
840 B
Go
45 lines
840 B
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package regexplru
|
|
|
|
import (
|
|
"regexp"
|
|
|
|
"code.gitea.io/gitea/modules/log"
|
|
|
|
lru "github.com/hashicorp/golang-lru"
|
|
)
|
|
|
|
var lruCache *lru.Cache
|
|
|
|
func init() {
|
|
var err error
|
|
lruCache, err = lru.New(1000)
|
|
if err != nil {
|
|
log.Fatal("failed to new LRU cache, err: %v", err)
|
|
}
|
|
}
|
|
|
|
// GetCompiled works like regexp.Compile, the compiled expr or error is stored in LRU cache
|
|
func GetCompiled(expr string) (r *regexp.Regexp, err error) {
|
|
v, ok := lruCache.Get(expr)
|
|
if !ok {
|
|
r, err = regexp.Compile(expr)
|
|
if err != nil {
|
|
lruCache.Add(expr, err)
|
|
return nil, err
|
|
}
|
|
lruCache.Add(expr, r)
|
|
} else {
|
|
r, ok = v.(*regexp.Regexp)
|
|
if !ok {
|
|
if err, ok = v.(error); ok {
|
|
return nil, err
|
|
}
|
|
panic("impossible")
|
|
}
|
|
}
|
|
return r, nil
|
|
}
|