3 files changed, 70 insertions, 0 deletions
diff --git a/vendor/github.com/josharian/intern/README.md b/vendor/github.com/josharian/intern/README.md
new file mode 100644
index 000000000..ffc44b219
--- /dev/null
+++ b/vendor/github.com/josharian/intern/README.md
@@ -0,0 +1,5 @@
+Docs: https://godoc.org/github.com/josharian/intern
+
+See also [Go issue 5160](https://golang.org/issue/5160).
+
+License: MIT
diff --git a/vendor/github.com/josharian/intern/intern.go b/vendor/github.com/josharian/intern/intern.go
new file mode 100644
index 000000000..7acb1fe90
--- /dev/null
+++ b/vendor/github.com/josharian/intern/intern.go
@@ -0,0 +1,44 @@
+// Package intern interns strings.
+// Interning is best effort only.
+// Interned strings may be removed automatically
+// at any time without notification.
+// All functions may be called concurrently
+// with themselves and each other.
+package intern
+
+import "sync"
+
+var (
+	pool sync.Pool = sync.Pool{
+		New: func() interface{} {
+			return make(map[string]string)
+		},
+	}
+)
+
+// String returns s, interned.
+func String(s string) string {
+	m := pool.Get().(map[string]string)
+	c, ok := m[s]
+	if ok {
+		pool.Put(m)
+		return c
+	}
+	m[s] = s
+	pool.Put(m)
+	return s
+}
+
+// Bytes returns b converted to a string, interned.
+func Bytes(b []byte) string {
+	m := pool.Get().(map[string]string)
+	c, ok := m[string(b)]
+	if ok {
+		pool.Put(m)
+		return c
+	}
+	s := string(b)
+	m[s] = s
+	pool.Put(m)
+	return s
+}
diff --git a/vendor/github.com/josharian/intern/license.md b/vendor/github.com/josharian/intern/license.md
new file mode 100644
index 000000000..353d3055f
--- /dev/null
+++ b/vendor/github.com/josharian/intern/license.md
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Josh Bleecher Snyder
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.