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50 lines
1.0 KiB
50 lines
1.0 KiB
3 years ago
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package internal contains non-exported functionality that are used by
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// packages in the text repository.
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package internal // import "golang.org/x/text/internal"
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import (
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"sort"
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"golang.org/x/text/language"
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)
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// SortTags sorts tags in place.
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func SortTags(tags []language.Tag) {
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sort.Sort(sorter(tags))
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}
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type sorter []language.Tag
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func (s sorter) Len() int {
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return len(s)
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}
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func (s sorter) Swap(i, j int) {
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s[i], s[j] = s[j], s[i]
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}
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func (s sorter) Less(i, j int) bool {
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return s[i].String() < s[j].String()
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}
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// UniqueTags sorts and filters duplicate tags in place and returns a slice with
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// only unique tags.
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func UniqueTags(tags []language.Tag) []language.Tag {
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if len(tags) <= 1 {
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return tags
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}
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SortTags(tags)
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k := 0
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for i := 1; i < len(tags); i++ {
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if tags[k].String() < tags[i].String() {
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k++
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tags[k] = tags[i]
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}
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}
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return tags[:k+1]
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}
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