route/vendor/github.com/asdine/storm/q/regexp.go

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2017-04-28 23:28:25 +00:00
package q
import (
"fmt"
"regexp"
"sync"
)
// Re creates a regexp matcher. It checks if the given field matches the given regexp.
// Note that this only supports fields of type string or []byte.
func Re(field string, re string) Matcher {
regexpCache.RLock()
if r, ok := regexpCache.m[re]; ok {
regexpCache.RUnlock()
return NewFieldMatcher(field, &regexpMatcher{r: r})
}
regexpCache.RUnlock()
regexpCache.Lock()
r, err := regexp.Compile(re)
if err == nil {
regexpCache.m[re] = r
}
regexpCache.Unlock()
return NewFieldMatcher(field, &regexpMatcher{r: r, err: err})
}
var regexpCache = struct {
sync.RWMutex
m map[string]*regexp.Regexp
}{m: make(map[string]*regexp.Regexp)}
type regexpMatcher struct {
r *regexp.Regexp
err error
}
func (r *regexpMatcher) MatchField(v interface{}) (bool, error) {
if r.err != nil {
return false, r.err
}
switch fieldValue := v.(type) {
case string:
return r.r.MatchString(fieldValue), nil
case []byte:
return r.r.Match(fieldValue), nil
default:
return false, fmt.Errorf("Only string and []byte supported for regexp matcher, got %T", fieldValue)
}
}