snapshot of https://github.com/go-gitea/gitea.git (main, 2026-09-15; blobs > 131072B omitted)

modules/regexplru/regexplru.go

@@ -0,0 +1,41 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package regexplru
+
+import (
+	"regexp"
+	"sync"
+
+	lru "github.com/hashicorp/golang-lru/v2"
+)
+
+type lruItem struct {
+	regexp *regexp.Regexp
+	err    error
+}
+
+type RegexpCache struct {
+	lruCache *lru.Cache[string, *lruItem]
+}
+
+func NewCache(size int) *RegexpCache {
+	lruCache, _ := lru.New[string, *lruItem](size)
+	return &RegexpCache{lruCache: lruCache}
+}
+
+// GetCompiled works like regexp.Compile, the compiled expr or error is stored in LRU cache
+func (regexpCache *RegexpCache) GetCompiled(expr string) (r *regexp.Regexp, err error) {
+	v, ok := regexpCache.lruCache.Get(expr)
+	if !ok {
+		r, err = regexp.Compile(expr)
+		regexpCache.lruCache.Add(expr, &lruItem{regexp: r, err: err})
+		return r, err
+	}
+	return v.regexp, v.err
+}
+
+var (
+	UserCache   = sync.OnceValue(func() *RegexpCache { return NewCache(1000) })
+	SystemCache = sync.OnceValue(func() *RegexpCache { return NewCache(1000) })
+)

modules/regexplru/regexplru_test.go

@@ -0,0 +1,25 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package regexplru
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRegexpLru(t *testing.T) {
+	r, err := UserCache().GetCompiled("a")
+	assert.NoError(t, err)
+	assert.True(t, r.MatchString("a"))
+
+	r, err = UserCache().GetCompiled("a")
+	assert.NoError(t, err)
+	assert.True(t, r.MatchString("a"))
+	assert.Equal(t, 1, UserCache().lruCache.Len())
+
+	_, err = UserCache().GetCompiled("(")
+	assert.Error(t, err)
+	assert.Equal(t, 2, UserCache().lruCache.Len())
+}