| // Copyright 2015 go-swagger maintainers |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package validate |
| |
| import ( |
| re "regexp" |
| "sync" |
| "sync/atomic" |
| ) |
| |
| // Cache for compiled regular expressions |
| var ( |
| cacheMutex = &sync.Mutex{} |
| reDict = atomic.Value{} //map[string]*re.Regexp |
| ) |
| |
| func compileRegexp(pattern string) (*re.Regexp, error) { |
| if cache, ok := reDict.Load().(map[string]*re.Regexp); ok { |
| if r := cache[pattern]; r != nil { |
| return r, nil |
| } |
| } |
| |
| r, err := re.Compile(pattern) |
| if err != nil { |
| return nil, err |
| } |
| cacheRegexp(r) |
| return r, nil |
| } |
| |
| func mustCompileRegexp(pattern string) *re.Regexp { |
| if cache, ok := reDict.Load().(map[string]*re.Regexp); ok { |
| if r := cache[pattern]; r != nil { |
| return r |
| } |
| } |
| |
| r := re.MustCompile(pattern) |
| cacheRegexp(r) |
| return r |
| } |
| |
| func cacheRegexp(r *re.Regexp) { |
| cacheMutex.Lock() |
| defer cacheMutex.Unlock() |
| |
| if cache, ok := reDict.Load().(map[string]*re.Regexp); !ok || cache[r.String()] == nil { |
| newCache := map[string]*re.Regexp{ |
| r.String(): r, |
| } |
| |
| for k, v := range cache { |
| newCache[k] = v |
| } |
| |
| reDict.Store(newCache) |
| } |
| } |