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62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
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// Copyright 2018 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 compact defines a compact representation of language tags.
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//
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// Common language tags (at least all for which locale information is defined
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// in CLDR) are assigned a unique index. Each Tag is associated with such an
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// ID for selecting language-related resources (such as translations) as well
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// as one for selecting regional defaults (currency, number formatting, etc.)
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//
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// It may want to export this functionality at some point, but at this point
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// this is only available for use within x/text.
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package compact // import "golang.org/x/text/internal/language/compact"
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import (
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"sort"
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"strings"
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"golang.org/x/text/internal/language"
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)
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// ID is an integer identifying a single tag.
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type ID uint16
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func getCoreIndex(t language.Tag) (id ID, ok bool) {
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cci, ok := language.GetCompactCore(t)
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if !ok {
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return 0, false
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}
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i := sort.Search(len(coreTags), func(i int) bool {
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return cci <= coreTags[i]
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})
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if i == len(coreTags) || coreTags[i] != cci {
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return 0, false
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}
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return ID(i), true
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}
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// Parent returns the ID of the parent or the root ID if id is already the root.
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func (id ID) Parent() ID {
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return parents[id]
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}
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// Tag converts id to an internal language Tag.
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func (id ID) Tag() language.Tag {
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if int(id) >= len(coreTags) {
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return specialTags[int(id)-len(coreTags)]
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}
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return coreTags[id].Tag()
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}
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var specialTags []language.Tag
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func init() {
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tags := strings.Split(specialTagsStr, " ")
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specialTags = make([]language.Tag, len(tags))
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for i, t := range tags {
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specialTags[i] = language.MustParse(t)
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}
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}
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