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// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package i18n
import (
"errors"
"fmt"
"reflect"
"strings"
"code.gitea.io/gitea/modules/log"
"gopkg.in/ini.v1"
)
var (
ErrLocaleAlreadyExist = errors.New("lang already exists")
DefaultLocales = NewLocaleStore()
)
type locale struct {
store *LocaleStore
langName string
langDesc string
messages *ini.File
}
type LocaleStore struct {
// at the moment, all these fields are readonly after initialization
langNames []string
langDescs []string
localeMap map[string]*locale
defaultLang string
}
func NewLocaleStore() *LocaleStore {
return &LocaleStore{localeMap: make(map[string]*locale)}
}
// AddLocaleByIni adds locale by ini into the store
func (ls *LocaleStore) AddLocaleByIni(langName, langDesc string, localeFile interface{}, otherLocaleFiles ...interface{}) error {
if _, ok := ls.localeMap[langName]; ok {
return ErrLocaleAlreadyExist
}
iniFile, err := ini.LoadSources(ini.LoadOptions{
IgnoreInlineComment: true,
UnescapeValueCommentSymbols: true,
}, localeFile, otherLocaleFiles...)
if err == nil {
iniFile.BlockMode = false
lc := &locale{store: ls, langName: langName, langDesc: langDesc, messages: iniFile}
ls.langNames = append(ls.langNames, lc.langName)
ls.langDescs = append(ls.langDescs, lc.langDesc)
ls.localeMap[lc.langName] = lc
}
return err
}
func (ls *LocaleStore) HasLang(langName string) bool {
_, ok := ls.localeMap[langName]
return ok
}
func (ls *LocaleStore) ListLangNameDesc() (names, desc []string) {
return ls.langNames, ls.langDescs
}
// SetDefaultLang sets default language as a fallback
func (ls *LocaleStore) SetDefaultLang(lang string) {
ls.defaultLang = lang
}
// Tr translates content to target language. fall back to default language.
func (ls *LocaleStore) Tr(lang, trKey string, trArgs ...interface{}) string {
l, ok := ls.localeMap[lang]
if !ok {
l, ok = ls.localeMap[ls.defaultLang]
}
if ok {
return l.Tr(trKey, trArgs...)
}
return trKey
}
// Tr translates content to locale language. fall back to default language.
func (l *locale) Tr(trKey string, trArgs ...interface{}) string {
var section string
idx := strings.IndexByte(trKey, '.')
if idx > 0 {
section = trKey[:idx]
trKey = trKey[idx+1:]
}
trMsg := trKey
if trIni, err := l.messages.Section(section).GetKey(trKey); err == nil {
trMsg = trIni.Value()
} else if l.store.defaultLang != "" && l.langName != l.store.defaultLang {
// try to fall back to default
if defaultLocale, ok := l.store.localeMap[l.store.defaultLang]; ok {
if trIni, err = defaultLocale.messages.Section(section).GetKey(trKey); err == nil {
trMsg = trIni.Value()
}
}
}
if len(trArgs) > 0 {
fmtArgs := make([]interface{}, 0, len(trArgs))
for _, arg := range trArgs {
val := reflect.ValueOf(arg)
if val.Kind() == reflect.Slice {
// before, it can accept Tr(lang, key, a, [b, c], d, [e, f]) as Sprintf(msg, a, b, c, d, e, f), it's an unstable behavior
// now, we restrict the strange behavior and only support:
// 1. Tr(lang, key, [slice-items]) as Sprintf(msg, items...)
// 2. Tr(lang, key, args...) as Sprintf(msg, args...)
if len(trArgs) == 1 {
for i := 0; i < val.Len(); i++ {
fmtArgs = append(fmtArgs, val.Index(i).Interface())
}
} else {
log.Error("the args for i18n shouldn't contain uncertain slices, key=%q, args=%v", trKey, trArgs)
break
}
} else {
fmtArgs = append(fmtArgs, arg)
}
}
return fmt.Sprintf(trMsg, fmtArgs...)
}
return trMsg
}
func ResetDefaultLocales() {
DefaultLocales = NewLocaleStore()
}
// Tr use default locales to translate content to target language.
func Tr(lang, trKey string, trArgs ...interface{}) string {
return DefaultLocales.Tr(lang, trKey, trArgs...)
}
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