Hulk did something

[bytom/vapor.git] / vendor / golang.org / x / text / internal / internal.go

diff --git a/vendor/golang.org/x/text/internal/internal.go b/vendor/golang.org/x/text/internal/internal.go
new file mode 100644 (file)
index 0000000..eac8328
--- /dev/null
+++ b/vendor/golang.org/x/text/internal/internal.go
@@ -0,0 +1,51 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:generate go run gen.go
+
+// Package internal contains non-exported functionality that are used by
+// packages in the text repository.
+package internal // import "golang.org/x/text/internal"
+
+import (
+       "sort"
+
+       "golang.org/x/text/language"
+)
+
+// SortTags sorts tags in place.
+func SortTags(tags []language.Tag) {
+       sort.Sort(sorter(tags))
+}
+
+type sorter []language.Tag
+
+func (s sorter) Len() int {
+       return len(s)
+}
+
+func (s sorter) Swap(i, j int) {
+       s[i], s[j] = s[j], s[i]
+}
+
+func (s sorter) Less(i, j int) bool {
+       return s[i].String() < s[j].String()
+}
+
+// UniqueTags sorts and filters duplicate tags in place and returns a slice with
+// only unique tags.
+func UniqueTags(tags []language.Tag) []language.Tag {
+       if len(tags) <= 1 {
+               return tags
+       }
+       SortTags(tags)
+       k := 0
+       for i := 1; i < len(tags); i++ {
+               if tags[k].String() < tags[i].String() {
+                       k++
+                       tags[k] = tags[i]
+               }
+       }
+       return tags[:k+1]
+}