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