59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
// SPDX-FileCopyrightText: Copyright 2015-2025 go-swagger maintainers
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// SPDX-License-Identifier: Apache-2.0
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package validate
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import (
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"maps"
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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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maps.Copy(newCache, cache)
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reDict.Store(newCache)
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}
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}
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