1 files changed, 71 insertions, 0 deletions
diff --git a/vendor/github.com/go-openapi/validate/rexp.go b/vendor/github.com/go-openapi/validate/rexp.go
new file mode 100644
index 000000000..76de03e1f
--- /dev/null
+++ b/vendor/github.com/go-openapi/validate/rexp.go
@@ -0,0 +1,71 @@
+// 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)
+	}
+}