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i18n.go
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i18n.go
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package i18n
import (
"path/filepath"
"regexp"
"strings"
"github.com/goccy/go-json"
"github.com/gotnospirit/messageformat"
"golang.org/x/text/language"
)
// Unmarshaler unmarshals the translation files, can be `json.Unmarshal` or `yaml.Unmarshal`.
type Unmarshaler func(data []byte, v any) error
// I18n is the main internationalization core.
type I18n struct {
defaultLocale string
defaultLanguage language.Tag
languages []language.Tag
unmarshaler Unmarshaler
languageMatcher language.Matcher // matcher is a language.Matcher configured for all supported languages.
fallbacks map[string][]string
parsedTranslations map[string]map[string]*parsedTranslation
runtimeParsedTranslations map[string]*parsedTranslation
}
// WithUnmarshaler replaces the default translation file unmarshaler.
func WithUnmarshaler(u Unmarshaler) func(*I18n) {
return func(bundle *I18n) {
bundle.unmarshaler = u
}
}
// WithFallback changes fallback settings.
func WithFallback(f map[string][]string) func(*I18n) {
return func(bundle *I18n) {
bundle.fallbacks = f
}
}
func WithDefaultLocale(locale string) func(*I18n) {
return func(bundle *I18n) {
bundle.defaultLanguage = language.Make(locale)
bundle.defaultLocale = bundle.defaultLanguage.String()
}
}
func WithLocales(languages ...string) func(*I18n) {
return func(bundle *I18n) {
var tags []language.Tag
for _, lang := range languages {
tag, err := language.Parse(lang)
if err == nil && tag != language.Und {
tags = append(tags, tag)
}
}
bundle.languages = tags
}
}
// New creates a new internationalization.
func NewBundle(options ...func(*I18n)) *I18n {
bundle := &I18n{
languages: make([]language.Tag, 0),
unmarshaler: json.Unmarshal,
fallbacks: make(map[string][]string),
runtimeParsedTranslations: make(map[string]*parsedTranslation),
parsedTranslations: make(map[string]map[string]*parsedTranslation),
}
for _, o := range options {
o(bundle)
}
if bundle.defaultLanguage == language.Und {
bundle.defaultLanguage = bundle.languages[0]
bundle.defaultLocale = bundle.defaultLanguage.String()
}
if len(bundle.languages) > 0 && bundle.languages[0] != bundle.defaultLanguage {
for i, t := range bundle.languages {
if t == bundle.defaultLanguage {
bundle.languages = append(bundle.languages[:i], bundle.languages[i+1:]...)
break
}
}
bundle.languages = append([]language.Tag{bundle.defaultLanguage}, bundle.languages...)
} else if len(bundle.languages) == 0 {
bundle.languages = append(bundle.languages, bundle.defaultLanguage)
}
bundle.languageMatcher = language.NewMatcher(bundle.languages)
return bundle
}
func (bundle *I18n) SupportedLanguages() []language.Tag {
return bundle.languages
}
func (bundle *I18n) getExactSupportedLocale(locale string) string {
_, i, confidence := bundle.languageMatcher.Match(language.Make(locale))
if confidence == language.Exact {
return bundle.languages[i].String()
}
return ""
}
// IsLanguageSupported indicates whether a language can be translated.
// The check is done by the bundle's matcher and therefore languages that are not returned by
// SupportedLanguages can be supported.
func (bundle *I18n) IsLanguageSupported(lang language.Tag) bool {
_, _, confidence := bundle.languageMatcher.Match(lang)
return confidence > language.No
}
// NewLocalizer reads a locale from the internationalization core.
func (bundle *I18n) NewLocalizer(locales ...string) *Localizer {
selectedLocale := bundle.defaultLocale
for _, locale := range locales {
locale = bundle.getExactSupportedLocale(locale)
if locale != "" {
if _, ok := bundle.parsedTranslations[locale]; ok {
selectedLocale = locale
break
}
}
}
return &Localizer{
bundle: bundle,
locale: selectedLocale,
}
}
var contextRegExp = regexp.MustCompile("<(.*?)>$")
// parsedTranslation
type parsedTranslation struct {
locale string
name string
text string
format *messageformat.MessageFormat
}
// trimContext
func trimContext(v string) string {
return contextRegExp.ReplaceAllString(v, "")
}
// parseTranslation
func (bundle *I18n) parseTranslation(locale, name, text string) (*parsedTranslation, error) {
parsedTrans := &parsedTranslation{
name: name,
}
parsedTrans.locale = locale
parsedTrans.text = text
base, _ := language.MustParse(locale).Base()
langParser, err := messageformat.NewWithCulture(base.String())
if err != nil {
return nil, err
}
parsedTrans.format, err = langParser.Parse(text)
if err != nil {
return nil, err
}
return parsedTrans, nil
}
// nameInsenstive converts `zh_CN.music.json`, `zh_CN` and `zh-TW` to `zh-CN`.
func nameInsenstive(v string) string {
v = filepath.Base(v)
v = strings.Split(v, ".")[0]
v = strings.ToLower(v)
v = strings.ReplaceAll(v, "_", "-")
return v
}
// formatFallbacks
func (bundle *I18n) formatFallbacks() {
for _, grandTrans := range bundle.parsedTranslations[bundle.defaultLocale] {
for locale, trans := range bundle.parsedTranslations {
//
if locale == bundle.defaultLocale {
continue
}
//
if _, ok := trans[grandTrans.name]; !ok {
if bestfit := bundle.lookupBestFallback(locale, grandTrans.name); bestfit != nil {
bundle.parsedTranslations[locale][grandTrans.name] = bestfit
}
}
}
}
}
// lookupBestFallback
func (bundle *I18n) lookupBestFallback(locale, name string) *parsedTranslation {
fallbacks, ok := bundle.fallbacks[locale]
if !ok {
if v, ok := bundle.parsedTranslations[bundle.defaultLocale][name]; ok {
return v
}
}
for _, fallback := range fallbacks {
if v, ok := bundle.parsedTranslations[fallback][name]; ok {
return v
}
if j := bundle.lookupBestFallback(fallback, name); j != nil {
return j
}
}
return nil
}