50 lines
1 KiB
Go
50 lines
1 KiB
Go
|
// 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.
|
||
|
|
|
||
|
|
// 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]
|
||
|
|
}
|