func MobileInit() {
	initChan := make(chan struct{})
	initDone = initChan
	go func() {
		defer close(initChan)
		langs := preferredLanguages()
		fmt.Printf("PREFERRED LANGUAGES: %v\n", langs)
		matcher := language.NewMatcher([]language.Tag{
			language.MustParse("en_US"),
			language.MustParse("es_MX"),
		})
		tag, idx, conf := matcher.Match(langs...)
		fmt.Printf("I think we'll go with %s (%d th place choice with %s confidence)\n", tag, idx, conf)
		if locale := tag.String(); locale != "en-us" {
			t, err := loadDictionary(locale)
			if err != nil {
				panic(fmt.Sprintf("Cannot load '%s': %s", locale, err))
			}
			translate = t
		}
		if t, err := loadDictionary("en-us"); err != nil {
			panic(fmt.Sprintf("Cannot load 'en-us': %s", err))
		} else {
			translateFallback = t
		}
	}()
}

func init() {
	tags := []language.Tag{}
	for _, s := range strings.Split(supported, " ") {
		tags = append(tags, language.MustParse(s))
	}
	matcher = language.NewMatcher(tags)
	Supported = language.NewCoverage(tags)
}

func getLanguage(w http.ResponseWriter, r *http.Request) string {
	var preferred []language.Tag
	var err error
	save := false

	r.ParseForm()
	lang := r.Form.Get("lang")
	if lang != "" {
		preferred, _, err = language.ParseAcceptLanguage(lang)
		if err != nil {
			// log err
		} else {
			save = true
		}
	}

	if preferred == nil {
		cookie, err := r.Cookie("lang")
		if err == nil {
			preferred, _, err = language.ParseAcceptLanguage(cookie.Value)
			if err != nil {
				// log err
			}
		}
	}

	if preferred == nil {
		preferred, _, err = language.ParseAcceptLanguage(r.Header.Get("Accept-Language"))
		if err != nil {
			// log err
		}
	}

	matcher := language.NewMatcher([]language.Tag{
		language.English,
		language.Italian,
		language.French,
	})
	code, _, _ := matcher.Match(preferred...)
	base, _ := code.Base()

	if save {
		now := time.Now()
		expires := now.AddDate(1, 0, 0)
		http.SetCookie(w, &http.Cookie{
			Name:    "lang",
			Value:   base.String(),
			Path:    "/",
			Expires: expires,
		})
	}

	return base.String()
}

// LanguageDefault returns the canonical name of the default encoding for a
// given language.
func LanguageDefault(tag language.Tag) string {
	matcherOnce.Do(func() {
		tags := []language.Tag{}
		for _, t := range strings.Split(locales, " ") {
			tags = append(tags, language.MustParse(t))
		}
		matcher = language.NewMatcher(tags)
	})
	_, i, _ := matcher.Match(tag)
	return canonical[localeMap[i]] // Default is Windows-1252.
}

func init() {
	tags := make([]language.Tag, numSupported)
	s := supported
	for i := range tags {
		p := strings.IndexByte(s, '|')
		tags[i] = language.Raw.Make(s[:p])
		s = s[p+1:]
	}
	matcher = language.NewMatcher(tags)
	Supported = language.NewCoverage(tags)

	Values = language.NewCoverage(langTagSet.Tags, supportedScripts, supportedRegions)
}

func checkLang(srcStr, targStr string) tree.Bool {
	srcLang := language.Make(srcStr)
	srcRegion, srcRegionConf := srcLang.Region()

	targLang := language.Make(targStr)
	targRegion, targRegionConf := targLang.Region()

	if srcRegionConf == language.Exact && targRegionConf != language.Exact {
		return tree.Bool(false)
	}

	if srcRegion != targRegion && srcRegionConf == language.Exact && targRegionConf == language.Exact {
		return tree.Bool(false)
	}

	_, _, conf := language.NewMatcher([]language.Tag{srcLang}).Match(targLang)
	return tree.Bool(conf >= language.High)
}

func ExampleParseAcceptLanguage() {
	// Tags are reordered based on their q rating. A missing q value means 1.0.
	fmt.Println(language.ParseAcceptLanguage(" nn;q=0.3, en-gb;q=0.8, en,"))

	m := language.NewMatcher([]language.Tag{language.Norwegian, language.Make("en-AU")})

	t, _, _ := language.ParseAcceptLanguage("da, en-gb;q=0.8, en;q=0.7")
	fmt.Println(m.Match(t...))

	// Danish is pretty close to Norwegian.
	t, _, _ = language.ParseAcceptLanguage(" da, nl")
	fmt.Println(m.Match(t...))

	// Output:
	// [en en-GB nn] [1 0.8 0.3] <nil>
	// en-AU 1 High
	// no 0 High
}

//Read all .ini files in dir, where the filenames are BCP 47 tags
//Use the language matcher to get the best match for the locale preference
func InitI18n(locale, dir string) {
	pref := language.Make(locale) // falls back to en-US on parse error

	files, err := ioutil.ReadDir(dir)
	if err != nil {
		log.Fatal(err)
	}

	serverLangs := make([]language.Tag, 1)
	serverLangs[0] = language.AmericanEnglish // en-US fallback
	for _, file := range files {
		if filepath.Ext(file.Name()) == ".ini" {
			name := strings.TrimSuffix(file.Name(), ".ini")
			tag, err := language.Parse(name)
			if err == nil {
				serverLangs = append(serverLangs, tag)
			}
		}
	}
	matcher := language.NewMatcher(serverLangs)
	tag, _, _ := matcher.Match(pref)

	fname := filepath.Join(dir, tag.String()+".ini")
	conf, err := configparser.Read(fname)
	if err != nil {
		log.Fatal("cannot read translation file for", tag.String(), err)
	}

	formats, err := conf.Section("formats")
	if err != nil {
		log.Fatal("Cannot read formats sections in translations for", tag.String(), err)
	}
	translations, err := conf.Section("strings")
	if err != nil {
		log.Fatal("Cannot read strings sections in translations for", tag.String(), err)
	}

	i18nProvider = &i18n{
		translation_dir: dir,
		formats:         formats.Options(),
		translations:    translations.Options(),
		locale:          tag,
	}
}

// Init registers locales ll and default locale def for the entire app.
func Init(ll Locales, def language.Tag) {
	if locales != nil {
		panic(errors.New("i18n: Init called multiple times"))
	}

	locales = ll
	defaultLocale = def

	if !locales.Has(def) {
		panic(fmt.Errorf("i18n: default locale %q doesn't exist", def))
	}

	tt := []language.Tag{def}
	for t := range ll {
		if t != def {
			tt = append(tt, t)
		}
	}
	matcher = language.NewMatcher(tt)
}

// ExampleDictionary shows how to reduce the amount of data linked into your
// binary by only using the predefined Dictionary variables of the languages you
// wish to support.
func ExampleDictionary() {
	tags := []language.Tag{
		language.English,
		language.German,
		language.Japanese,
		language.Russian,
	}
	dicts := []*display.Dictionary{
		display.English,
		display.German,
		display.Japanese,
		display.Russian,
	}

	m := language.NewMatcher(tags)

	getDict := func(t language.Tag) *display.Dictionary {
		_, i, confidence := m.Match(t)
		// Skip this check if you want to support a fall-back language, which
		// will be the first one passed to NewMatcher.
		if confidence == language.No {
			return nil
		}
		return dicts[i]
	}

	// The matcher will match Swiss German to German.
	n := getDict(language.Make("gsw")).Languages()
	fmt.Println(n.Name(language.German))
	fmt.Println(n.Name(language.Make("de-CH")))
	fmt.Println(n.Name(language.Make("gsw")))

	// Output:
	// Deutsch
	// Schweizer Hochdeutsch
	// Schweizerdeutsch
}

package util

import (
	"golang.org/x/text/language"
	"net/http"
)

var SupportedLanguageMatcher = language.NewMatcher([]language.Tag{
	language.SimplifiedChinese,
	language.English,
})

func Language(req *http.Request) language.Tag {
	tags, _, _ := language.ParseAcceptLanguage(req.Header.Get("Accept-Language"))
	tag, _, _ := SupportedLanguageMatcher.Match(tags...)
	return tag
}

// license that can be found in the LICENSE file.

package language_test

import (
	"fmt"
	"net/http"
	"strings"

	"golang.org/x/text/language"
)

// matcher is a language.Matcher configured for all supported languages.
var matcher = language.NewMatcher([]language.Tag{
	language.BritishEnglish,
	language.Norwegian,
	language.German,
})

// handler is a http.HandlerFunc.
func handler(w http.ResponseWriter, r *http.Request) {
	t, q, err := language.ParseAcceptLanguage(r.Header.Get("Accept-Language"))
	// We ignore the error: the default language will be selected for t == nil.
	tag, _, _ := matcher.Match(t...)
	fmt.Printf("%5v (t: %6v; q: %3v; err: %v)\n", tag, t, q, err)
}

func ExampleParseAcceptLanguage() {
	for _, al := range []string{
		"nn;q=0.3, en-us;q=0.8, en,",
		"gsw, en;q=0.7, en-US;q=0.8",

func (c *Collator) iter(i int) *iter {
	// TODO: evaluate performance for making the second iterator optional.
	return &c._iter[i]
}

// Supported returns the list of languages for which collating differs from its parent.
func Supported() []language.Tag {
	ids := strings.Split(availableLocales, ",")
	tags := make([]language.Tag, len(ids))
	for i, s := range ids {
		tags[i] = language.Make(s)
	}
	return tags
}

var matcher = language.NewMatcher(Supported())

// New returns a new Collator initialized for the given locale.
func New(t language.Tag, o ...Option) *Collator {
	tt, index, _ := matcher.Match(t)
	c := newCollator(colltab.Init(locales[index]))

	// Set the default options for the retrieved locale.
	c.setFromTag(tt)

	// Set options from the user-supplied tag.
	c.setFromTag(t)

	// Set the user-supplied options.
	c.setOptions(o)

package main

import (
	"C"
	"golang.org/x/text/language"
	"log"
)

var (
	mather = language.NewMatcher([]language.Tag{language.Make("en"), language.Make("ja"), language.Make("zh-TW"), language.Make("zh-CN")})
)

//export preferredLanguageFrom
func preferredLanguageFrom(httpAcceptLanguage *string) *string {

	tag, _, _ := language.ParseAcceptLanguage(*httpAcceptLanguage)
	t, _, _ := mather.Match(tag...)
	l := t.String()
	return &l
}

//export preferredLanguageFromUseCString
func preferredLanguageFromUseCString(cHttpAcceptLanguage *C.char) *C.char {
	httpAcceptLanguage := C.GoString(cHttpAcceptLanguage)

	tag, _, _ := language.ParseAcceptLanguage(httpAcceptLanguage)
	t, _, _ := mather.Match(tag...)
	return C.CString(t.String())
}

func init() {

package admin

import (
	"github.com/hypertornado/prago"
	"golang.org/x/text/language"
)

var (
	supportedLocales = []language.Tag{language.Czech, language.English}
	languageMatcher  = language.NewMatcher(supportedLocales)
	localeNames      = map[string]string{
		"cs": "Čeština",
		"en": "English",
	}
	availableLocales = [][2]string{{"en", "English"}, {"cs", "Čeština"}}
)

//GetLocale from request
func GetLocale(request prago.Request) string {
	user, hasUser := request.GetData("currentuser").(*User)
	if hasUser {
		if validLocale(user.Locale) {
			return user.Locale
		}
	}
	return localeFromRequest(request)
}

func validLocale(in string) bool {
	_, ok := localeNames[in]
	return ok

// ExampleMatcher_bestMatch gives some examples of getting the best match of
// a set of tags to any of the tags of given set.
func ExampleMatcher() {
	// This is the set of tags from which we want to pick the best match. These
	// can be, for example, the supported languages for some package.
	tags := []language.Tag{
		language.English,
		language.BritishEnglish,
		language.French,
		language.Afrikaans,
		language.BrazilianPortuguese,
		language.EuropeanPortuguese,
		language.Croatian,
		language.SimplifiedChinese,
		language.Raw.Make("iw-IL"),
		language.Raw.Make("iw"),
		language.Raw.Make("he"),
	}
	m := language.NewMatcher(tags)

	// A simple match.
	fmt.Println(m.Match(language.Make("fr")))

	// Australian English is closer to British than American English.
	fmt.Println(m.Match(language.Make("en-AU")))

	// Default to the first tag passed to the Matcher if there is no match.
	fmt.Println(m.Match(language.Make("ar")))

	// Get the default tag.
	fmt.Println(m.Match())

	fmt.Println("----")

	// Croatian speakers will likely understand Serbian written in Latin script.
	fmt.Println(m.Match(language.Make("sr-Latn")))

	// We match SimplifiedChinese, but with Low confidence.
	fmt.Println(m.Match(language.TraditionalChinese))

	// Serbian in Latin script is a closer match to Croatian than Traditional
	// Chinese to Simplified Chinese.
	fmt.Println(m.Match(language.TraditionalChinese, language.Make("sr-Latn")))

	fmt.Println("----")

	// In case a multiple variants of a language are available, the most spoken
	// variant is typically returned.
	fmt.Println(m.Match(language.Portuguese))

	// Pick the first value passed to Match in case of a tie.
	fmt.Println(m.Match(language.Dutch, language.Make("fr-BE"), language.Make("af-NA")))
	fmt.Println(m.Match(language.Dutch, language.Make("af-NA"), language.Make("fr-BE")))

	fmt.Println("----")

	// If a Matcher is initialized with a language and it's deprecated version,
	// it will distinguish between them.
	fmt.Println(m.Match(language.Raw.Make("iw")))

	// However, for non-exact matches, it will treat deprecated versions as
	// equivalent and consider other factors first.
	fmt.Println(m.Match(language.Raw.Make("he-IL")))

	// Output:
	// fr 2 Exact
	// en-GB 1 High
	// en 0 No
	// en 0 No
	// ----
	// hr 6 High
	// zh-Hans 7 Low
	// hr 6 High
	// ----
	// pt-BR 4 High
	// fr 2 High
	// af 3 High
	// ----
	// iw 9 Exact
	// iw-IL 8 Exact
}

func init() {
	matcher = language.NewMatcher([]language.Tag{
		language.AmericanEnglish,
		language.SimplifiedChinese,
	})
}

		language.French,
		language.Italian,
		language.Spanish,
		language.Japanese,
		language.Ukrainian,
	}
	dicts = []*display.Dictionary{
		display.English,
		display.German,
		display.French,
		display.Italian,
		display.Spanish,
		display.Japanese,
		display.Ukrainian,
	}
	matcher = language.NewMatcher(tags)
)

func init() {
	// @todo check if this is the proper way to generate the locales
	for _, tag := range display.Values.Tags() {
		b, bc := tag.Base()
		r, rc := tag.Region()
		if bc >= language.Exact && rc >= language.Low && !b.IsPrivateUse() && !r.IsPrivateUse() && r.IsCountry() {
			LocaleAvailable.Append(b.String() + LocaleSeparator + r.String())
		}
	}
	for _, tag := range tags {
		b, bc := tag.Base()
		r, rc := tag.Region()
		if bc >= language.High && rc >= language.Low {

package main

import (
	"fmt"

	"golang.org/x/text/language"
	"golang.org/x/text/language/display"
)

var userPrefs = []language.Tag{
	language.Make("gsw"), // Swiss German
	language.Make("fr"),  // French
}

var serverLangs = []language.Tag{
	language.AmericanEnglish, // en-US fallback
	language.German,          // de
}

var matcher = language.NewMatcher(serverLangs)

func main() {
	tag, index, confidence := matcher.Match(userPrefs...)

	fmt.Printf("best match: %s (%s) index=%d confidence=%v\n",
		display.English.Tags().Name(tag),
		display.Self.Name(tag),
		index, confidence)
	// best match: German (Deutsch) index=1 confidence=High
}