mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-12-30 14:00:57 +00:00
42 lines
914 B
Go
42 lines
914 B
Go
package htmlquery
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/antchfx/xpath"
|
|
"github.com/golang/groupcache/lru"
|
|
)
|
|
|
|
// DisableSelectorCache will disable caching for the query selector if value is true.
|
|
var DisableSelectorCache = false
|
|
|
|
// SelectorCacheMaxEntries allows how many selector object can be caching. Default is 50.
|
|
// Will disable caching if SelectorCacheMaxEntries <= 0.
|
|
var SelectorCacheMaxEntries = 50
|
|
|
|
var (
|
|
cacheOnce sync.Once
|
|
cache *lru.Cache
|
|
cacheMutex sync.Mutex
|
|
)
|
|
|
|
func getQuery(expr string) (*xpath.Expr, error) {
|
|
if DisableSelectorCache || SelectorCacheMaxEntries <= 0 {
|
|
return xpath.Compile(expr)
|
|
}
|
|
cacheOnce.Do(func() {
|
|
cache = lru.New(SelectorCacheMaxEntries)
|
|
})
|
|
cacheMutex.Lock()
|
|
defer cacheMutex.Unlock()
|
|
if v, ok := cache.Get(expr); ok {
|
|
return v.(*xpath.Expr), nil
|
|
}
|
|
v, err := xpath.Compile(expr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cache.Add(expr, v)
|
|
return v, nil
|
|
|
|
}
|