/
i18n.go
96 lines (80 loc) · 2.51 KB
/
i18n.go
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package i18n
import (
_ "embed" // import embed package
"fmt"
"strings"
"github.com/BurntSushi/toml"
"github.com/nicksnyder/go-i18n/v2/i18n"
"golang.org/x/text/language"
)
// Localizer is a wrapper around i18n.Localizer with a better API.
type Localizer struct {
localizers map[language.Tag]*i18n.Localizer
defaultLang language.Tag
defaultLocalizer *i18n.Localizer
}
// NewLocalizer creates a new Localizer from map with a key as filename and
// value as its content in toml format. Filename should satisfy the pattern
// <domain/description>.<language>.toml.
func NewLocalizer(defaultLang language.Tag, messagesMap map[string][]byte) (*Localizer, error) {
l := Localizer{
defaultLang: defaultLang,
localizers: map[language.Tag]*i18n.Localizer{},
}
bundle := i18n.NewBundle(defaultLang)
bundle.RegisterUnmarshalFunc("toml", toml.Unmarshal)
langs := make([]language.Tag, len(messagesMap))
var i int
for fileName, data := range messagesMap {
arr := strings.Split(fileName, ".")
if len(arr) != 3 {
return nil, fmt.Errorf("translation file [%s] does not satisfy pattern: <domain>.<language>.toml", fileName)
}
lang := arr[1]
langTag, err := language.Parse(lang)
if err != nil {
return nil, fmt.Errorf("language [%s] for file [%s] is not supported: %w", lang, fileName, err)
}
langs[i] = langTag
i++
bundle.MustParseMessageFileBytes(data, fileName)
l.localizers[langTag] = i18n.NewLocalizer(bundle, langTag.String())
}
var hasDefaultLang bool
for _, l := range langs {
if l == defaultLang {
hasDefaultLang = true
}
}
if !hasDefaultLang {
return nil, fmt.Errorf("bundle has no messages for default lang [%s]", defaultLang)
}
l.defaultLocalizer = l.localizers[defaultLang]
return &l, nil
}
// Localize returns localized string for default language.
func (l *Localizer) Localize(msgID string, params ...map[string]interface{}) string {
return localize(l.defaultLocalizer, msgID, params...)
}
// LocalizeFor returns localized string for specified language.
func (l *Localizer) LocalizeFor(lang language.Tag, msgID string, params ...map[string]interface{}) string {
localizer, ok := l.localizers[lang]
if !ok {
return ""
}
return localize(localizer, msgID, params...)
}
func localize(l *i18n.Localizer, msgID string, params ...map[string]interface{}) string {
var tmplData interface{}
if len(params) > 0 {
tmplData = params[0]
}
str, _ := l.Localize(&i18n.LocalizeConfig{
MessageID: msgID,
TemplateData: tmplData,
})
if str == "" {
return msgID
}
return str
}