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package i18n
import (
"errors"
"net/http"
"strconv"
"strings"
)
// Locale is locale value from the Accept-Language header in request
type Locale struct {
Lang, Country string
Qual float64
}
// Name returns the locale value in 'lang' or 'lang_country' format
// eg: de_DE, en_US, gb
func (l *Locale) Name() string {
if len(l.Country) > 0 {
return l.Lang + "_" + l.Country
}
return l.Lang
}
// ParseLocale creates a Locale from a locale string
func ParseLocale(locale string) Locale {
locsplt := strings.Split(locale, "_")
resp := Locale{}
resp.Lang = locsplt[0]
if len(locsplt) > 1 {
resp.Country = locsplt[1]
}
return resp
}
const (
acceptLanguage = "Accept-Language"
)
func supportedLocales(alstr string) []Locale {
locales := make([]Locale, 0)
alstr = strings.Replace(alstr, " ", "", -1)
if alstr == "" {
return locales
}
al := strings.Split(alstr, ",")
for _, lstr := range al {
locales = append(locales, Locale{
Lang: parseLang(lstr),
Country: parseCountry(lstr),
Qual: parseQual(lstr),
})
}
return locales
}
// GetLocales returns supported locales for the given requet
func GetLocales(r *http.Request) []Locale {
return supportedLocales(r.Header.Get(acceptLanguage))
}
// GetPreferredLocale return preferred locale for the given reuqest
// returns error if there is no preferred locale
func GetPreferredLocale(r *http.Request) (*Locale, error) {
locales := GetLocales(r)
if len(locales) == 0 {
return &Locale{}, errors.New("No locale found")
}
return &locales[0], nil
}
func parseLang(val string) string {
locale := strings.Split(val, ";")[0]
lang := strings.Split(locale, "-")[0]
return lang
}
func parseCountry(val string) string {
locale := strings.Split(val, ";")[0]
spl := strings.Split(locale, "-")
if len(spl) > 1 {
return spl[1]
}
return ""
}
func parseQual(val string) float64 {
spl := strings.Split(val, ";")
if len(spl) > 1 {
qualSpl := strings.Split(spl[1], "=")
if len(qualSpl) > 1 {
qual, err := strconv.ParseFloat(qualSpl[1], 64)
if err != nil {
return 1
}
return qual
}
}
return 1
}
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