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