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46 lines
912 B
46 lines
912 B
2 years ago
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// Copyright 2022 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package regexplru
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import (
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"regexp"
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"code.gitea.io/gitea/modules/log"
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lru "github.com/hashicorp/golang-lru"
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)
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var lruCache *lru.Cache
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func init() {
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var err error
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lruCache, err = lru.New(1000)
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if err != nil {
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log.Fatal("failed to new LRU cache, err: %v", err)
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}
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}
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// GetCompiled works like regexp.Compile, the compiled expr or error is stored in LRU cache
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func GetCompiled(expr string) (r *regexp.Regexp, err error) {
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v, ok := lruCache.Get(expr)
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if !ok {
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r, err = regexp.Compile(expr)
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if err != nil {
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lruCache.Add(expr, err)
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return nil, err
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}
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lruCache.Add(expr, r)
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} else {
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r, ok = v.(*regexp.Regexp)
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if !ok {
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if err, ok = v.(error); ok {
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return nil, err
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}
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panic("impossible")
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}
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}
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return r, nil
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}
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